detrital zircon signatures in precambrian and paleozoic

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Atlantic GeologyJournal of the Atlantic Geoscience SocietyRevue de la Société Géoscientifique de l'Atlantique

Detrital zircon signatures in Precambrian and Paleozoicsedimentary units in southern New Brunswick – more pieces ofthe puzzleSandra M. Barr, Deanne van Rooyen, Brent V. Miller, Chris E. White et Susan C.Johnson

Volume 55, 2019

URI : https://id.erudit.org/iderudit/1064942arDOI : https://doi.org/10.4138/atlgeol.2019.010

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Éditeur(s)Atlantic Geoscience Society

ISSN0843-5561 (imprimé)1718-7885 (numérique)

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Citer cet articleBarr, S., van Rooyen, D., Miller, B., White, C. & Johnson, S. (2019). Detrital zirconsignatures in Precambrian and Paleozoic sedimentary units in southern NewBrunswick – more pieces of the puzzle. Atlantic Geology, 55, 275–322.https://doi.org/10.4138/atlgeol.2019.010

Résumé de l'articleSouthern New Brunswick consists of a complex collage of fault-bounded beltsof Late Neoproterozoic igneous and metamorphic rocks, Early Paleozoicsedimentary, metamorphic and igneous units, and overlying Carboniferoussedimentary rocks. The area also contains the boundary between theAvalonian and Ganderian terranes as interpreted in the northern Appalachianorogen. New detrital zircon ages reported here provide improvedunderstanding of depositional ages and provenance of diverse Neoproterozoicto Carboniferous rocks in this complex area. Detrital zircon data from sampleswith Neoproterozoic maximum depositional ages indicate a dominantlyGondwanan provenance with a strong influence from the Amazonian craton.However, quartzite from The Thoroughfare Formation on Grand Manan Islandcontains dominanly 2 Ga zircon grains, consistent with derivation from theWest African Craton. The age spectrum is similar to that from the HutchinsIsland Quartzite in the Isleboro block in Penobscot Bay, Maine, strengtheningthe previously proposed correlation between the two areas. Cambrian samplesalso show prominent peri-Gondwanan provenance with strong influence fromEdiacaran to Early Cambrian arc magmatism. The maximum depositional agesof these samples are consistent with previous interpretations of Cambrian agesbased on fossil correlations and field data. A Carboniferous sample fromAvalonia shows a significant contribution from Devonian magmatism as theyoungest detrital component, although its depositional age based on fieldrelationships is Carboniferous. The results exemplify the need to integratemultiple datasets in making interpretations from detrital zircon data.

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ABSTRACT

Southern New Brunswick consists of a collage of fault-bounded belts of Late Neoproterozoic igneous and metamorphic rocks, early Paleozoic sedimentary, metamorphic and igneous units, and overlying Carboniferous and locally Triassic sedimentary rocks. The area also contains the boundary between Avalonia and Ganderia as interpreted in the northern Appalachian orogen. New detrital zircon ages reported here provide improved understanding of depositional ages and provenance of diverse Neoproterozoic to Carboniferous rocks in this complex area. Detrital zircon data from samples with Neoproterozoic maximum depositional ages indicate a dominantly Gondwanan provenance with strong influence from the Amazonian craton. However, quartzite from The Thoroughfare Formation on Grand Manan Island contains dominanly 2 Ga zircon grains, consistent with derivation from the West African craton. The age spectrum is similar to that of the Hutchins Island Quartzite in the Isleboro block in Penobscot Bay, Maine, strengthening the possibility of correlation between the two areas. Cambrian samples also show prominent peri-Gondwanan provenance with strong influence from Ediacaran to early Cambrian arc magmatism. The maximum depositional ages of these samples are consistent with previous interpretations of Cambrian ages based on fossil correlations and field data. A Carboniferous sample from Avalonia shows a significant contribution from Devonian magmatism as the youngest detrital component, although its depositional age based on field relationships is Carboniferous. The results exemplify the need to integrate multiple datasets in making interpretations from detrital zircon data.

RÉSUMÉ

Le sud du Nouveau-Brunswick est constitué d’un collage de ceintures délimitées par des failles de roches ignées et métamorphiques du Néoprotérozoïque tardif, d’unités sédimentaires, métamorphiques et ignées du Paléozoïque précoce, ainsi que de roches sédimentaires sus-jacentes du Carbonifère et, par endroits, du Trias. Le secteur comprend également la frontière établie entre Avalonia et Ganderia selon son interprétation à l’intérieur de la partie septentrionale de l’orogène des Appalaches. De nouvelles datations de zircon détritique rapportées ici permettent une meilleure compréhension des âges sédimentaires et de la provenance des diverses roches néoprotérozoïques à carbonifères dans ce secteur complexe. Les données relatives au zircon détritique obtenues des échantillons faisant état d’âges sédimentaires remontant au maximum au Néoprotérozoïque signalent une provenance en prédominance gondwanienne avec une forte influence du craton amazonien. Le quartzite de la Formation The Thoroughfare sur l’île Grand Manan renferme toutefois prédominament des grains de zircon de 2 Ga, ce qui correspond à une dérivation du craton de l’Afrique occidentale. Le spectre de l’âge est similaire à celui du quartzite de l’île Hutchins à l’intérieur du bloc Isleboro dans la baie Penobscot, au Maine, ce qui renforce la possibilité d’une corrélation entre les deux secteurs. Les échantillons du Cambrien font eux aussi état d’une provenance périgondwanienne prononcée, marquée d’une forte influence d’un magmatisme d’arc de l’Édiacarien au Cambrien précoce. Les âges sédimentaires maximaux de ces échantillons correspondent aux interprétations antérieures des datations du Cambrien basées sur des corrélations de fossiles et des données d’échantillonnage sur le terrain. Un échantillon du Carbonifère provenant d’Avalonia révèle une contribution prononcée du magmatisme

Detrital zircon signatures in Precambrian and Paleozoic sedimentary units in Ganderia and Avalonia of southern

New Brunswick, Canada – more pieces of the puzzleSandra M. Barr1, Deanne van Rooyen2, Brent V. Miller3, Chris E. White4, and Susan C. Johnson5

1. Department of Earth and Environmental Science, Acadia University; Wolfville, Nova Scotia B4P 2R6, Canada2. Department of Mathematics, Physics, and Geology, Cape Breton University, Sydney, Nova Scotia, B1P 6L2, Canada

3. Department of Geology and Geophysics, Texas A & M University, College Station, Texas 77843-3115, USA4. Geological Survey, Nova Scotia Department of Energy and Mines, Halifax, Nova Scotia B3J 2T9, Canada

5. Geological Survey Branch, New Brunswick Department of Energy and Resource Development,Sussex, New Brunswick E4E 7H7, Canada

Corresponding author <[email protected]>

Date received: 31 March 2019 ¶ Date accepted: 15 July 2019

doi:10.4138/atlgeol.2019.010ATLANTIC GEOLOGY 55, 275–322 (2019)0843-5561|18|0275–0322$8.20|0

mailto:sandra.barr%40acadiau.ca?subject=

Copyright © Atlantic Geology, 2019Barr et al. – Detrital zircon signatures in Precambrian and Paleozoic sedimentary units in Ganderia and Avalonia of southern New Brunswick, Canada – more pieces of the puzzle

ATLANTIC GEOLOGY · VOLUME 55 · 2019 276

INTRODUCTION AND GEOLOGICAL SETTING

Southern New Brunswick consists of a complex assem-blage of three fault-bounded belts of mainly Neoproterozoic rocks with minor Paleozoic rocks termed (from southeast to northwest) Caledonia, Brookville, and New River, as well as five belts of mainly lower Paleozoic rocks termed Kings-ton, Mascarene, Annidale, St. Croix, and Fredericton (Fig. 1a). The area spans the boundary between Avalonia and Ganderia as defined by Hibbard et al. (2006), who placed the northern edge of Avalonia at the Caledonia-Clover Hill Fault that forms the boundary between the Caledonia and Brookville belts (Fig. 1b). In this interpretation most of New Brunswick, including Grand Manan Island, is considered part of Ganderia, as is adjacent New England (e.g., Fyffe et al. 2011; van Staal et al. 2011), whereas Avalonia extends offshore into the Bay of Fundy from the Caledonia belt of southern New Brunswick, underlies the Gulf of Maine, and re-emerges onshore in the Boston area of southeastern New England (Thompson et al. 2010).

The definition of Ganderia and Avalonia in the northern Appalachian orogen is based on multiple lines of evidence in-cluding differences in stratigraphy, magmatic and metamor-phic histories, isotopic characteristics, and (increasingly) detrital zircon signatures which can provide information regarding source areas for present components of Ganderia and Avalonia during their pre-Appalachian evolution. The distribution of ages of detrital zircon grains in sedimentary units is a means of comparing units of similar age located in different areas, as well as an indicator of provenance. In ad-dition, the youngest detrital zircon grains give an indication of maximum depositional age, significant in units where other age constraints are minimal or lacking. All three of these applications have relevance in southern New Bruns-wick, and this technique has been applied previously to rock units in that area as well as in adjacent parts of New England and Nova Scotia (Barr et al. 2003a, 2012; Fyffe et al. 2009; Satkoski et al. 2010; Dokken et al. 2018; Ludman et al. 2018). The significance of differences in detrital zircon populations between Ganderia and Avalonia is an ongoing debate, and the database of detrital zircon U–Pb data for both pre- and post-Appalachian strata is growing. The results reported in this paper add to that database, which may ultimately help to resolve questions about the initial relationships among the fault-bounded geological belts of southern New Bruns-wick (Fig. 1a).

As in other Appalachian detrital zircon studies the inter-pretations in the present study have to deal with difficulties in interpreting Meso- to Neoproterozoic zircons that could have multiple sources, for example the commonly encoun-tered 1.4 – 1.0 Ga zircon grains which can be derived from

any number of long-lived magmatic systems in arcs and continental settings associated with the Grenville orogen in either the West African or Amazonian craton. This difficulty is magnified in syn- and post-collisional strata because of potential contributions from the Laurentian craton with its very large area of Grenville-age magmatic activity. In addi-tion, in Paleozoic samples the Proterozoic signatures are ob-scured by extensive contributions from syn-accretional and collisional magmatic systems active through the Ordovician to Devonian history of the Appalachian orogen.

New LA-ICP-MS detrital zircon age spectra are reported here for six sedimentary and metasedimentary rock units in southern New Brunswick. This study includes samples NB12-314 and NB12-315 of Cambrian age in the New River belt (Figs. 2, 3), one sample GM10-01 of uncertain Pre-cambrian age and two samples NB16-356 and NB16-358 of Neoproterozoic to early Cambrian age from Grand Manan Island (Fig. 4), and sample BL15-01 from the Carboniferous Balls Lake Formation near the city of Saint John (Fig. 5). The new data are compared to previously published data, and in combination, shed light on stratigraphic and terrane relations in the area.

METHODS

Detrital zircon U-Th-Pb laser-ablation, inductively cou-pled plasma mass spectrometry (LA-ICPMS) analyses were conducted at the Texas A & M University R. Ken Williams Radiogenic Isotope Geosciences Laboratory (samples GM10-01, NB12-314, and NB12-315) and the University of New Brunswick (samples BL15-01, NB16-356, and NB16-358).

At Texas A & M University, zircon grains were concen-trated from rock samples using standard crushing and den-sity separation (jaw and disc crusher, Wilfley table, heavy liquids) methods. Zircon grains were separated from other dense minerals by hand-picking in a petrie dish under a bin-ocular microscope, but no further separation was performed on the bulk zircon aliquot recovered from heavy liquids. The bulk zircon aliquot was piled and quartered repeatedly in the petrie dish to obtain a sub-sample of about 1000 grains. This zircon sub-sample was mounted on double-sided tape and encased in a 2.5 cm diameter epoxy disc, along with fragments of NIST 610, NIST 612, one primary reference material (zircon 91500; Wiedenbeck et al. 1995) and two secondary reference materials (zircons R33 and FC-1; Black et al. 2004 and Paces and Miller 1993, respectively). The disk was abraded with 2000 grit sandpaper to expose the interi-or of zircon grains and polished to 0.25 µm on a diamond- suspension lap wheel. LA-ICPMS analyses were conducted

dévonien à titre d’élément détritique le plus récent, mais son âge sédimentaire le situe au Carbonifère d’après les relations établies sur le terrain. Les résultats illustrent la nécessité d’une intégration de plusieurs ensembles de données pour effectuer des interprétations à partir de données provenant de zircon détritique.

[Traduit par la redaction]



on a ThermoScientific iCAP RQ quadrupole mass spec-trometer running in standard high-sensitivity (STDS) mode connected to an esi/NWR 193 nm 4 ns pulsed excimer laser

system equipped with a two-volume sample cell (Tv2). In-strument settings and run parameters are given in Table A1 and analytical data in Table A2. Data are reduced using Iolite

Bay ofFundy

??

CCFZ

AvaloniaGanderia

KF

FF

CCHFW

BF

BF

OB

F

BBF

SaintJohn

Fig. 3

Fig. 2

Fig. 5

Fig. 4GrandMananIsland

SG

SG

F

SC

A

Almond RoadGroup

M

M

NR

NR

K

B

C

o66 00'

o66 00'

o67 00'

N

0 10 20

km

o45 30’N

o45 N o

45 N

Moncton

SaintJohn

100km

NEWBRUNSWICK

MAINE

Major fault

St. Croix

Fredericton

Silurian - Devonian plutonic rocks

Lower Paleozoic belts Precambrian belts

Mascarene

Annidale

Mainly Carboniferous rocks

New River

Kingston

Partridge Island block

Brookville

Caledonia

SG

SC

F

M

A

NR

K

B

C

Laurentian Realm

Laurentian margin

peri-Laurentian arcs

peri-Gondwanan arcs

Peri-Gondwanan Realm

Ganderia

Avalonia

Meguma

CANADA

NewBrunswick

UNITED STATES

Newfoundland

Nova ScotiaCape

BretonIslandArea of

map in (a)

New England

Quebec

Gulf ofSt. Lawrence

Gulf ofMaine

Atlantic Ocean

65º

70º

55º

50º

45º40º

0 200

km

N

(b)

(a)

PenobscotBay area

Figure 1. (a) Simplified geological map of part of southwestern New Brunswick after Barr et al. (2014c). Boxes indicate the locations of the four areas shown in Figures 2–5 from which detrital zircon ages are presented. Arrow indicates the location of the detrital zircon sample from the Almond Road Group in the New River terrane reported by Johnson et al. (2018). Fault abbreviations: CCFZ, Cobequid-Chedabucto fault zone; CCHF, Caledonia-Clover Hill Fault. (b) Divisions of the northern Appalachian orogen after Hibbard et al. (2006) showing the location of the study area (black rectangle).



v. 3.5 (Paton et al. 2011) under the U–Pb Geochron4 data re-duction scheme (Paton et al. 2010). Analysis of the primaryreference material, each treated separately as an unknown,indicates an internal analytical reproducibility of U–Pbages to better than 0.7%. The average accuracy of secondary

reference materials (Table A2) is better than 2.25% (FC-1) and better than 1.5% (R33).

For the dating done at the University of New Brunswick (UNB), rock samples were sent to Overburden Drilling Man-agement in Ottawa, Ontario, for electro-pulse disaggregation

F

F

F

F

F

F

F

LON

G

R

EACH

SAIN

T

JOHN

RIV

ER

VictoriaBeach

Greenwich Hill

Lobster

Brook

Public Landing

BeulahCamp

BrownsFlat

CatonsIsland

Belyeas Point

McKeel

Cheyne

Rd.

Settlement

SWF

SWF

SJC

SJC

SJC

ZLI

ZLI

ZLI

ZLI

ZLB

ZLB

ZLB

ZLB

ZLB

ZLB

SJC

SCC

WHEATON BROOK

FAULT

FAULT

BELLEISLE

ZCBvs

ZCBvs

CHBmc

CHBfc

CHBfc

ZCBvs

ZCBvs

ZCBvs

ZCBvs

ZCBvs

ZCBvs

ZCBvs

CHBmc

CHBmc

CHBmc

CHBmc

ZCBFmc

ZCBFmv

NB12-314

ZCBFmv

F

F

FF

F

F

F

F

F

F

SCC

SMvs

SJC SWL

SWSLR

SLR

SLR

SWL

SWL

SW

SW

SWF

SILURIAN

Mascarene Group

Kingston GroupCunningham Creek Fm

Westfield Formation

Williams Lake Formation

basalt and grey shale

grey siltstone/sandstone & dacite

dacitic - rhyolitic volcanic rks

basaltic - dacitic volcanic rks

mafic volcanic rocks/siltstone

Welsford Granite (ca. 422 Ma)

Jones Creek Formation

Long Reach Formation

CHB

CGF

CFH

CFHCGF

Saint John Group

Hanford Brook Formation

Glen Falls Formationquartz arenite

fc-siltstone and fine sandstonemc-sandstone & quartz arenite

dark shale and limestoneForest Hills Formation

EARLY - MIDDLE CAMBRIAN

ZCBFmc

ZCBFmv

ZLB

ZLI

ZCBvs

Belleisle Bay Group (ca. 540 Ma)

Lingley Plutonic Suite (ca. 630-625 Ma)

Lobster Brook Formation (ca. 554 Ma)felsic tuffaceous rocks & qtz-feldspar porphyry

red pyroclastic and epiclastic rocks

mafic volcanic rocks

red and green sedimentary rocks

Browns Flat Formation

Browns Flat Formation

Beulah Camp Formation

NEOPROTEROZOIC

LATE NEOPROTEROZOIC - EARLY CAMBRIAN

0 2.5 km

N

Figure 2. Geological map of the Long Reach area in the New River belt showing the location of dated quartz arenite sample NB12-314. Map is modified from Figure 5 in Barr et al. (2014c).



and zircon separation. Zircon grains were then hand-picked at Cape Breton University and taken to UNB where they were mounted in epoxy-covered thin sections polished to expose the centres of the zircon grains and imaged using cold cathodoluminescence to identify internal zoning and inclusions. These images were used to select ablation points (30 µm diameter), avoiding any visible inclusions, cracks, or other imperfections. U and Pb isotopic compositions were measured using the Resonetics S-155-LR 193 nm Excimer laser ablation system connected to an Agilent 7700x quad-rupole inductively coupled plasma – mass spectrometer,

following the procedure outlined by McFarlane and Luo (2012) and Archibald et al. (2013). Data reduction was done in-house using Iolite software (Paton et al. 2011) to process the laser output into data files, and further reduced for U–Pb geochronology using VizualAge (Petrus and Kamber 2012). Data were sorted by % concordance (206Pb/238U ver-sus 207Pb/235U), and by the % of radiogenic Pb in the grains as calculated using VizualAge (Table A3, A4).

In all cases we present probability distribution histograms based on 206Pb/238U dates for grains <1000 Ma and 207Pb/206Pb dates for >1000 Ma, and show all grains that are between 95

Beaver Harbour Porphyry (551 Ma)

Blacks Harbour Granite(620 Ma)

Simpsons Island Formation (Cambrian)

Buckmans Creek Formation (Cambrian)

Lancaster Formation (Carboniferous)

Balls Lake Formation (Carboniferous)

gabbro dyke (Mesozoic)

NB12-315

GL West Branch Reservoir Granite & related volcanic rocks and dykes (Silurian)

778

Woodla

nd Cove

Beaver

Harbour

Belleisl

e

Fau

lt

Figure 3. Geological map of the Beaver Harbour area showing the location of dated quartz arenite sample NB12-315. Map is modified from Barr et al. (2014a).



Low DuckIsland

High DuckIsland

X

X

Fish Head

Hw

y. 776

Flagg Cove

Outer WoodIsland

RockweedPond

North Head

The Dock

Castalia LongIsland

PriestCove

GrandHarbour

RossIslandIngalls

Head

Long PondBay

CheneyIsland

White HeadIsland

WoodIsland

ThreeIslands

TRIASSIC

Fundy Group

PRECAMBRIAN - EARLY CAMBRIAN

PRECAMBRIAN

Stanley Brook Granite

Rockweed Pond, Outer Wood Island andFish Head gabbros (various ages?)

Long Pond Bay Formation

Priest Cove Formation

Ross Island and North Head formations

Great Duck Island and Flagg Cove formations

High Duck Island Granite

Three Islands Granite

Ingalls Head Formation

Thoroughfare Formation

Kent Island Formation

Normal fault

Strike-slip fault

Thrust fault

Previously dated site

This study

K

KK

XX

The Thoroughfare

The Thoroughfare

KentIsland

2 3

km

10

GreatDuckIsland

GRAND MANAN GROUP

*

*

*

*

* *

<588 Ma

618 ± 3 Ma

NB16-358

*

***

*

*

539 ± 3 Ma

547 ± 1 Ma

535 ± 2 MaCASTALIA GROUP

618 ± 3 Ma

611 ± 2 Ma

Nantucket Island

GM10-01NB16-356

VL2001-10<574 ± 7 Ma>535 ± 2 Ma(Fyffe et al. 2009)



also commonly the most deeply colored in shades of pink and purple or tan. Other large (100–150 µm long), more elongate zircon grains show light tan color. Relatively rare, small (50–100 µm long), colorless crystals are acicular with sharp corners and tips.

A large percentage of the grains are discordant, and abla-tion profiles are consistent with Pb-loss being the dominant cause of discordance, as opposed to zircon grains with multi-ple age components. The main population of grains has ages between 480 and 540 Ma, with only four older grains be-tween 1 and 3.2 Ga (Figs. 6a, b). Three grains have 206Pb/238U ages of ca. 450 Ma but they do not overlap within error and all are less than 98% concordant, our cut-off for calculating concordia ages as mentioned earlier, likely because of Pb loss. In contrast, a few grains have ages between 480 and 500 Ma that overlap within error, and three of these grains produce a calculated concordia age of 487.5 ± 13 Ma with very high MSWD of 15 and probability near zero. Using only two grains produces a calculated concordia age of 485.8 ± 19 Ma with a slightly better MSWD of 10.7 and probability of 0.001. The weighted mean of 7 grains between 475 and 495 Ma is 486.8 ± 6.1 at 95% confidence with MSWD = 2.6, and probability = 0.015 (Fig. 6a, inset). Overall, we consider that the best estimate of the maximum depositional age for the sediment is ca. 487 Ma (late Cambrian to Early Ordovician).

This age, although not well constrained, is considerably younger than the age of 508.05 ± 2.75 Ma reported for an ash bed in the Hanford Brook Formation in the Somer-set Street section in the city of Saint John (Landing et al. 1998; Schmitz 2012). Based on fossils, the age of the Han-ford Brook Formation spans the traditional early to middle Cambrian boundary, or in newer time scales, the boundary between Series 2 and 3 (Palacios et al. 2016) at about 509 Ma (Cohen et al. 2013 updated 2018).

SAMPLE NB12-315 - BUCKMANS CREEK

Geological setting

The Buckmans Creek Formation (e.g., Currie 1988) in the Beaver Harbour area of the New River belt (Fig. 3) is an assemblage of fault-bounded and internally faulted sedi-mentary and mafic volcanic rocks that are in places fossilif-erous. They have been correlated with the Saint John Group of the Saint John area (Fig. 5), implying a link between the New River and Caledonia belts (e.g., Currie 1988; Tanoli and Pickerill 1988; Landing 1996; Johnson 2001; Landing et al. 2008). Landing et al. (2008) assigned these Cambri-an rocks to the marginal platform of the late Proterozoic to early Paleozoic Avalon microcontinent. They identified the lower Cambrian Chapel Island and Random formations in the Buckmans Creek area, unconformably overlain by mafic

and 101% concordant. To determine the youngest age rep-resented in each sample we use only clusters of more than 3 grains with ages that overlap within error and are 98–101% concordant. Using only near-concordant grains that overlap within error is a conservative approach which serves to re-duce the possibility of misrepresenting the maximum dep-ositional age as too young by using single grains that may have experienced Pb loss (Dickinson and Gehrels 2010).

For each dated sample, the geological setting is described, followed by the results and interpretation. A subsequent Discussion deals with the oveall implications of the new data.

SAMPLE NB12-314 - CHEYNE SETTLEMENT ROAD

Geological setting

Quartz arenite sample NB12-314 was collected from an outcrop on Cheyne Settlement Road in the Long Reach area of the New River belt (Fig. 2). Cheyne Settlement Road crosses an enclave of Cambrian rocks, one of several such occurrences in the Long Reach area (Fig. 2). The Cambrian rocks overlie Late Neoproterozoic to early Cambrian vol-canic rocks of the Belleisle Bay Group and have been cor-related with the Saint John Group (Fig. 2). Matthew (1891) discovered the acrotretid brachiopod Linnarsonnia misera in grey sandstone at Belyeas Landing (now the “Public Landing” shown on Figure 2) about 600 m east of the sam-pled quartz arenite and Yoon (1970) later discovered trilo-bites at the same location which he suggested are consistent with a late early Cambrian age, consistent with the work of Boyce and Johnson (2004) based on newly collected mate-rial. Small black phosphatic shells tentatively identified as L. misera (R. Miller, personal communication, 2001) werediscovered also in a sequence of dark grey shale, siltstoneand very fine-grained, micaceous sandstone on Cheyne Set-tlement Road about 1.2 km west of Public Landing. Johnson(2001) assigned all of the rocks within the enclave, includ-ing the quartz arenite unit sampled for dating in the presentstudy, to the Hanford Brook Formation of the Saint JohnGroup (Fig. 2).

The dated sample is grey medium-grained quartz arenite. It is dominated by subangular to subrounded quartz grains and less than 10% silt/clay matrix. Feldspar, spherulitic vol-canic, and quartzite clasts occur rarely.

Results

Zircon grains separated from sample NB12-314 display a wide range of sizes, morphologies, and colors. Most grains have abraded corners and edges and are rounded. The larg-est (~150 um diameter) and most highly rounded grains are

Figure 4. (previous page) Geological map of Grand Manan Island showing the location of dated samples NB16-356, NB16-358, and GM10-01. Map is modified from Fyffe (2014).



Near the mouth of Buckmans Creek, the formation is sep-arated from the plutonic rocks of the Beaver Harbour por-phyry by a reverse dip-slip fault (Bartsch 2005). The Beaver Harbour porphyry yielded a U–Pb zircon age of 551 ± 1.2 Ma (Barr et al. 2014a). On its northwestern margin, the forma-tion is in faulted contact with the ca. 620 Ma Blacks Harbour granite (Barr et al. 2003b; Bartsch 2005).

Dated quartz arenite sample NB12-315 is from the unit assigned to the Random Formation by Landing et al. (2008). The sample is light grey and consists of recrystallized quartz grains that are sutured and polygonal in places. It contains rare felsic volcanic and quartzite clasts, and almost no matrix.

Results

A total of 203 zircon grains were analyzed from sample NB12-315. The main population has ages from 510 to 590 Ma (Figs. 6c, d). Other grains give an almost continuous range of ages from 1 Ga to 2 Ga and a few grains lie between 2 and 3.2 Ga. The youngest 4 grains that overlap within

volcanic-dominated rocks which Landing et al. (2008) as-signed to the “Wade’s Lane Formation”. This name appears to be an incorrect transcription of “Waites Lane” which is shown on road signs in the area and on topographic maps.

Landing et al. (2008) reported that the presence of late early Cambrian trilobites and small shelly taxa in the lowest part of their “Wade’s Lane Formation” demonstrates a hiatus between rocks that they assigned to the Random Formation and those of their “Wade’s Lane Formation”. They interpret-ed the volcanic rocks in the Beaver Harbour section as the result of latest early to middle middle Cambrian pyroclastic volcanism, one of three known volcanic centers that extend-ed 550 km along the northwest margin of the Avalon micro-continent. According to Landing et al. (2008), the volcanic rocks are overlain by grey-green mudstone and limestone of the Fossil Brook Member and black mudstone of the upper Manuels River Formation. However, given the uncertainty of long-distance correlations in a complex orogen, we con-tinue to use the earlier established name Buckmans Creek Formation collectively for all these rocks.

Quaco Formation: red-brown conglomerate,sandstone, mudstone

Cumberland Group: Lancaster Formation: greysandstone, siltstone, minor conglomerate

TRIASSIC

LATE CARBONIFEROUS (Pennsylvanian)

Cumberland Group?: Balls Lake Formation:conglomerate, sandstone, mudstone

LATE DEVONIAN-EARLY CARBONIFEROUS (Mississippian)

Taylors Island Formation/West Beach Formation

Lorneville Group

Granitoid tectonite interlayered with Lorneville Group

Tiner Point Complex

Granitoid tectonite: leucotonalite(l)/alkali-feldspar granite(a)/quartz monzodiorite(q) with rare enclaves of metasedimentary rock

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Figure 5. Geological map of the Saint John area showing the location of dated sample BL16-01, Map is modified from Park et al. (2014).



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Figure 6. Probability density plots and histograms for U–Pb data: (a) Sample NB12-314; (b) Expanded view of the data be-tween 400 and 650 Ma for sample NB12-314; (c) Sample NB12-315; (d) Expanded view of the data between 400 and 650 Ma for sample NB12-315; (e) Sample GM10-01. Inserts in (a) and (c) show weighted mean ages for the youngest population of concordant zircon grains in each sample. Data are from Appendix Table A1. Dates with discordance >10% are excluded from these diagrams.



has ages between 1.9 and 2.2 Ga, with another significant peak at ca. 2.5, and an almost continuous range of ages from 2.5 to 3.2 Ga (Fig. 6e). The youngest two grains are around 1.65 Ga, but they do not overlap within error and cannot be used for a concordia age. Based on these youngest grains the maximum depositional age of the sample may be less than 1.65 Ga but this estimate is not robust. The maximum depo-sitional age based on the detrital zircon populations is better constrained at 1.9 Ga based on the major population peaks.

SAMPLE NB16-356 - LONG POND BAY FORMATION

Geological setting

The Long Pond Bay Formation is exposed along Long Pond Bay and on nearby Wood Island on southern Grand Manan Island (Fig. 4). The Long Pond Bay shoreline section consists of subaqueous hyaloclastic basalt flows, mafic vol-canic breccia, peperitic basalt, green cherty mudstone, and medium- to thick-bedded wacke. On Wood and adjacent islands, amygdaloidal basalt flows, felsic tuff, and arkosic sandstone appear to have been deposited in shallower wa-ter and are associated with coarse-grained gabbroic rocks (Fig. 4). A sample from a rhyolitic tuff or high-level intru-sion from Wood Island yielded few zircon grains that were interpreted by Miller et al. (2007) to indicate a maximum depositional age of ca. 588 Ma. The relatively undeformed features of the unit and its lithological similarities to Siluri-an units of the Mascarene terrane on the mainland (McLeod et al. 1994) led to the assumption of a Silurian age (Miller et al. 2007). However, Fyffe (2014) subsequently interpreted the Long Pond Bay Formation to be part of the Ediacaran–Cambrian Castalia Group, together with the Priest Cove Formation dated at 539 ± 3 Ma by Miller et al. (2007). Fyffe (2014) correlated the Long Pond Bay Formation with the Simpsons Island Formation in the New River terrane on the mainland which also yielded an age of 539 ± 4 Ma (Barr et al. 2003b).

Dated sample NB16-356 is from a grey sandstone unit in the Long Pond Bay shoreline section (Fig. 4). It is imma-ture and matrix-supported and consists of angular quartz and less abundant plagioclase grains in a fine matrix of clay (sericite) and silt. Detrital muscovite and biotite altered to chlorite are also present.

Results

In this sample only 64 out of 145 grains are between 95 and 101% concordant and a further 22 grains are between 90 and 95% concordant. The largest population of zircon grains in sample NB16-356 is in the range between 690 and 600 Ma, with minor populations at around ca. 790 Ma, 1.1–1.2 Ga, and a few grains between 1.5–2 Ga (Figs. 7a, b). The concordia age of the youngest three grains that over-lap is 614.6 ± 6.1 Ma with MSWD = 5.7 and probability (of concordance) = 0.017. The weighted mean of the youngest

error have a calculated concordia age of 518.4 ± 2.8 Ma with MSWD = 6.7 and probability = 0.010. The calculat-ed concordia age with 5 overlapping grains including one that is more discordant is 518.3 ± 4.7 Ma with much higher MSWD of 12.0 and lower probability of 0.001. The weighted mean of the same 5 grains is 517.2 ± 2.7 at 95% confidence with MSWD = 0.41 and probability = 0.80 (Fig. 6c, inset). Hence the maximum depositional age for this sample is in-terpreted to be ca. 517 Ma (Cambrian series 2; Cohen et al. 2013, revised 2018).

SAMPLE GM10-01 - THE THOROUGHFARE FORMATION

Geological setting

The Thoroughfare Formation of Grand Manan Island is exposed on Ross, Nantucket, and White Head islands off the southeastern coast (Fig. 4). It is composed of very thick- to thin-bedded, locally cross-bedded, white to light grey quartzite interbedded with grey to black carbonaceous shale. Where exposed on the western shore of The Thor-oughfare, the contacts between the formation and volcanic sequences of the Priest Cove Formation are highly sheared and interpreted as thrust faults based on the presence of low-angle cleavages in the vicinity of their mutual bound-aries (Fyffe 2014). The inferred age of The Thoroughfare Formation is late Proterozoic as suggested by Alcock (1948) who correlated the quartzite with quartzite interstratified with platformal stromatolitic carbonates of the Late Pro-terozoic Green Head Group in the Saint John area on the New Brunswick mainland, although the latter unit does not include carbonaceous shale and The Thoroughfare Forma-tion lacks carbonate rocks, so the only rock type in common is the quartzite itself. The Thoroughfare Formation could be correlative with the Hutchins Island Quartzite in Penobscot Bay, Maine (Fig. 1b) which also has an inferred late Protero-zoic age (Reusch et al. 2018).

The dated quartzite sample consists of recrystallized quartz grains that are rectangular and elongate parallel to a weak foliation. Granular quartz around the larger grains suggests that brittle deformation may have overprinted ear-lier ductile structures. Rare muscovite and tourmaline are also present.

Results

Sample GM10-01 is distinctive in that it contains only Pa-leoproterozoic and older zircon grains that are much older than the inferred Late Proterozoic stratigraphic age. Its de-trital signature is unlike any others yet seen in New Bruns-wick, including the nearby Flagg Cove Formation (Fig. 3; Fyffe et al. 2009), but like those from samples from Georges Bank and Penobscot Bay inferred to represent sediments deposited on the West African Craton (Kuiper et al. 2017; Reusch et al. 2018). The biggest population of zircon grains



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Figure 7. Probability density plots and histograms for U–Pb data: (a) Sample NB16-356; (b) Expanded view of the data be-tween 540 and 840 Ma for sample NB16-356; (c) Sample NB16-358; (d) Expanded view of the data between 300 and 900 Ma for sample NB16-358; (e) Sample BL15-01; (f) Expanded view of the data between 350 and 800 Ma for sample BL15-01. Note that the expanded-scale diagrams in (b), (d), and (f) have different scales. Inserts in (a), (c), and (e) show weighted mean ages for the youngest population of concordant zircon grains in each sample. Data are from Appendix Table A1. Dates with discordance >10% are excluded from these diagrams.



Based on these data, the maximum depositional age for this sample is interpreted to be ca. 580 Ma, similar to that of the Long Pond Bay Formation as determined by Miller et al. (2007). This age is consistent with the suggestion by Fyffe (2014) that the volcanic rocks of the Ross Island Formation represent a proximal facies of the Priest Cove Formation.

SAMPLE BL15-01 - BALLS LAKE FORMATION

Geological setting

The Balls Lake Formation is a coarse clastic sedimentary unit in the Saint John area that is interpreted currently as the lower unit of the Upper Carboniferous Cumberland Group (Fig. 5). However, traditionally it was included in the Mispec Group as the middle formation, underlain by basal-tic and sedimentary rocks of the West Beach Formation and overlain by plant-bearing lithic arenite of the Lancaster For-mation. The sequence was considered conformable and the entire group regarded as Mississippian(?) to Pennsylvanian or Pennsylvanian based on plant remains in the Lancaster Formation (e.g., Hayes and Howell 1937; Alcock 1938). Plint and van der Poll (1982) reassigned the Balls Lake and Lancaster formations to the Cumberland Group and Park et al. (2014) showed that the West Beach Formation and the laterally correlative(?) Taylors Island Formation are part of the allochthonous Partridge Island block and not part of the stratigaphy of the Cumberland Group (Fig. 5). In the Calvert Lake area southeast of Saint John, rocks of the Partridge Is-land block are contained in a klippe, preserved in a synform in the Balls Lake Formation that plunges gently west-south-west. The conglomerate–sandstone–mudstone sequence of the surrounding Balls Lake Formation is overturned to the south in the footwall of the Calvert Lake klippe along its southern contact, consistent with thrust transport toward the south-southeast. The Balls Lake Formation has no direct biostratigraphic controls on its age.

The dated sample is typical reddish-grey sandstone from the Balls Lake Formation in the overturned section on Bayshore Drive. It contains subangular quartz and pla-gioclase in a sericitic matrix that contain abundant carbon-ate cement. The quartz grains are angular to subangular and varied in size and shape. Detrital muscovite and opaque phases are abundant.

Results

The largest populations of zircon grains in sample BL15-01 are in the range between ca. 430 and 390 Ma (Figs. 7e, f). Smaller groups of ages occur at ca. 550 Ma, 600 Ma and 1 Ga, with a few older grains between 1 Ga and 2 Ga. The youngest 5 grains that overlap within error have a calculat-ed concordia age of 397.3 ± 1.9 Ma with MSWD= 5.0, and probability (of concordance) = 0.025. The weighted mean of the same 5 grains is 396.5 ± 1.9 Ma at 95% confidence with MSWD = 0.78 and probability = 0.54 (Fig. 7e, inset).

6 grains that overlap within error is 614.7 ± 4.6 at 95% con-fidence with MSWD = 0.67 and probability = 0.64 (Fig. 7a, inset). The interpreted maximum depositional age for this sample is therefore < 614 Ma. This result does not tighten the limited constraints on the depositional age of the Long Pond Bay Formation, previously suggested to be <588 Ma (Miller et al. 2007). However, the similarity of the dates from the youngest detrital grains to the U–Pb (zircon) ages of 617.6 ± 3.2 Ma and 618.3 ± 2.8 Ma for two tuffaceous samples from separate locations in the nearby Ingalls Head Formation (Fig. 4) suggest that the Ingalls Head Formation was the source of the detrital grains. The result is consistent with the inclusion of the Long Pond Bay Formation in the upper part of the Neoproterozoic to Lower Cambrian Casta-lia Group (Fyffe 2014).

SAMPLE NB16-358 - ROSS ISLAND FORMATION

Geological setting

The Ross Island Formation underlies the greater part of Ross and White Head islands near the southeastern coast of Grand Manan (Fig. 4). It comprises interstratified plagioclase-phyric mafic and intermediate flows and brec-cias intruded by numerous diabase dykes. The flows are locally pillowed and interbedded with green laminated silt-stone. They range from basalt to andesite based on chemical composition, and are calc-alkalic, formed in a volcanic arc setting (Hilyard 1992; Hewitt 1993; Hodgins 1994; Pe-Piper and Wolde 2000; Black 2005). The Ross Island Forma-tion appears to be truncated by faults that separate it from quartzite of The Thoroughare Formation on the northern tip of Ross Island and western tip of White Head Island (Fig. 4). The formation had no previous age constraints but was assumed to be part of the Precambrian to early Cambrian Castalia Group (Fyffe 2014).

Dated sample NB16-358 is dark grey laminated siltstone that occurs in peperitic relationship with basalt near the fer-ry terminal on the western shore of White Head Island. The sample is fine-grained and contains abundant plagioclase. Its swirly matrix contains abundant sericite and has an ash-like appearance.

Results

NB16-358 is very poor in zircon and only had 25 grains an-alyzed, 20 of which are betwee 95 and 101% concordant. The largest populations of zircon grains are in the range between ca. 580 Ma and 630 Ma, with a small group at ca. 700 Ma, and a few grains between 1 and 2 Ga (Figs. 7c, d). A single grain at ca. 320 Ma is not considered to be a reliable indica-tor of maximum depositional age. The concordia age of the youngest three grains that overlap is 585.5 ± 8.4 Ma with MSWD = 2.6 and a probability (of concordance) = 0.11. The weighted mean of the same four grains is 580 ± 11 at 95% confidence with MSWD = 0.26, and probability = 0.86.



Based on these data, the maximum depositional age for this sample is interpreted to be ca. 396 Ma, much older than the inferred Late Carboniferous depositional age for the forma-tion based on field relationships. The lack of Late Devonian–Early Carboniferous ages indicates that the Partridge Island block, which contains volcanic and plutonic rocks of that age, was not providing debris to this unit of the Balls Lake Formation. The Middle Devonian – Silurian zircon grains in the sample could have been derived from any number of plutonic suites both locally and farther afield.

DISCUSSION

Depositional ages

The depositional ages of all six samples included in this study are equivocal based on other evidence, and hence the maximum depositional ages described above based on the youngest zircon populations are potentially important. However, as in all detrital zircon studies, the data are viewed in combination with field and other evidence because of the potential for Pb loss which can move zircon ages to younger points along concordia (e.g., Dickinson and Gehrels 2010), as well as the possibility of inclusion of second-cycle detritus or lack of zircon sources close in age to the deposition of sediment. However, even with these caveats in mind, the de-trital zircon U–Pb data provide valuable information about sedimentary provenance and maximum depositional ages. The samples are discussed here in reverse age order.

The Silurian and younger populations present in sam-ple BL15-01 from the Balls Lake Formation include prom-inent populations of Early and Middle Devonian zircon grains but no younger grains, although the depositional age of the Balls Lake Formation is Carboniferous based on stratigraphic and field relationships (e.g., Park et al. 2014). A similar pattern of Carboniferous units with De-vonian zircon grains as their youngest populations was found in a study in the southern Appalachian orogen by Thomas et al. (2017) in which several Pennsylvanian units contain significant Devonian zircon populations but no younger grains. These well-documented examples are a reminder that “maximum deposition ages” provide only an upper limit on stratigraphic age. Pre-Devonian zircon grains are sparse in sample BL15-01 (Figs. 7e, f) and could be evidence for either Gondwanan or Laurentian source areas but could also represent recycled detrital mate-rial from multiple sources.

Cheyne Settlement Road sample NB12-314 contains a significant Cambrian zircon population with a maximum depositional age of ca. 487 Ma and, therefore, latest Cam-brian or younger (Figs. 6a, b). This maximum age is younger than the broadly “middle Cambrian” age generally assigned to the Hanford Brook Formation based on fossils and a U–Pb zircon date of 508.05 ± 2.75 Ma from an ash bed in the city of Saint John (Landing et al. 1998; Schmitz 2012). Although more work needs to be done in order to investi-

gate this apparent age enigma, it is possible that the Cheyne Settlement Formation is correlative instead with the Snider Mountain Formation in the Almond Road Group which oc-curs in the New River belt to the northeast (Fig. 1a). The youngest zircon population in quartz arenite in the Snider Mountain Formation is ca. 530 Ma, and the age of the up-per sequence that contains feldspathic quartz arenite near its base is constrained by a cross-cutting pluton that gave an age of 475.4 ± 1.6 Ma (Johnson et al. 2018). It is possible that the Cheyne Settlement sample exemplifies the grad-ual younging of quart arenite deposition within the same unit outward from the platform during protracted rifting and opening of the ocean basin along the Gondwanan margin as illustrated by Johnson et al. (2018).

The sample from Buckmans Creek (Fig. 3) also has a sig-nificant Cambrian zircon population but the youngest pop-ulation (maximum depoisitional age) is older at ca. 517 Ma (Cambrian series 2). Landing et al. (2008) interpreted the dated quartz arenite unit at Buckmans Creek to be part of the Random Formation. The age of that formation in the Saint John area (where it is historically known as the Glen Falls Formation) is constrained by volcanic ash beds with ages of ca. 528 Ma in the underlying Ratcliffe Brook Forma-tion and ca. 508 Ma in the overlying Hanford Brook Forma-tion. Hence the maximum depositional age of 517 Ma for sample NB12-315 is consistent with these age constraints.

In contrast to these early Paleozoic samples, the samples from the Long Pond Bay and Ross Island formations (Figs. 7a–d) do not have Cambrian or younger zircon grains and hence their maximum depositional ages based on zircon data alone appear to be Neoproterozoic. The data are broad-ly consistent with previous interpretations of these units as Neoproterozoic but do not narrow down the depositional age greatly, especially for the Long Pond Bay Formation, due to the small number of zircon grains that yielded concordant results. However, the results are consistent with the inter-pretations of Fyffe (2014) who included the Long Pond Bay Formation in the upper part of the Neoproterozoic to Lower Cambrian Castalia Group and suggested that the volcanic rocks of the Ross Island Formation are a proximal facies of the Priest Cove Formation of the Castalia Group (Fig. 4).

Provenance implications

To facilitate comparison of datasets of various sizes, data from the present study together with previously published detrital age data for samples from Avalonia and Ganderia in southern New Brunswick are displayed on probability plots normalized for the number of dates (Figs. 8, 9). Because older grains are typically much less abundant than Ediacaran grains and hence tend to be produce less prominent peaks on the probability plots (Fig. 8), the normalized plots in Figure 9 were made using only dates older than 900 Ma. Except for three samples (NB06-232, NB12-314, and NB16-358) in which the number of grains with dates >900 Ma is small (<10), the data give reasonable signatures for comparison of Mesopro-terozoic and older zircon signatures among samples (Fig. 9).



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Figure 8. Normalized probability distribution for the six detrital zircon samples of this study in comparison to other samples from southern New Brunswick from Barr et al. (2012, 2014b), Johnson et al. (2018), Fyffe et al. (2009), and Satkoski et al. (2010). Data are normalized against the total number of concordant dates for each sample.



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Figure 9. Normalized probability distribution using only ages >900 Ma for the six detrital zircon samples of this study in comparison to other samples from southern New Brunswick from Barr et al. (2012, 2014b), Johnson et al. (2018), Fyffe et al. (2009), and Satkoski et al. (2010). Data are normalized against the total number of concordant dates >900 Ma for each sample.



With the exception of sample GM10-01 from The Thor-oughfare Formation, all of the samples are characterized by prominent Ediacaran peaks in zircon ages (Fig. 8). Such peaks are characteristic of sedimentary rocks from Gondwana- derived terranes and reflect the widespread pan-African igneous activity related to the assembly of the Gondwa-nan continent (e.g., Satkoski et al. 2010; Pollock et al. 2009, 2015; Dokken et al. 2018; Ludman et al. 2018). It is difficult to assess the significance of the variations in the position of the Ediacaran peak or of the spread in Ediacaran ages in terms of specific provenance areas in Gondwana because even samples from a single belt or stratigraphic unit can dis-play significant differences, as has been documented in the Ganderian parts of New Brunswick, Nova Scotia, and New-foundland (e.g., Fyffe et al. 2009; Satkoski et al. 2010; Barr et al. 2012; van Rooyen et al. 2019).

In addition to the Ediacaran peak somewhere between 539 Ma and 619 Ma, most samples show a scatter of older Neoproterozoic ages back to about 900 Ma, although such older Neoproterozoic ages are notably absent in the Cheyne Settlement Road sample (Fig. 8). In general, Grenville-age (1.0–1.2 Ga) peaks are not present in the samples of this study or those compiled from previous studies (Fig. 9), indi-cating that Laurentian sources were not significant contrib-utors to these sediments. Also lacking in most samples are prominent “Eburnean” (2.0 –2.2 Ga) peaks, generally con-sidered indicative of African sources. Exceptions include the sample from The Thoroughfare Formation on Grand Manan Island, in which that peak is dominant, and the sam-ple from the nearby Flagg Cove Formation (data from Fyffe et al. 2009) which likely derived sediment from The Thor-oughfare Formation or equivalent units. In general, Gande-rian samples have more abundant Mesoproterozoic peaks than Avalonian samples, a pattern that is generally viewed as indicating Amazonian provenance (e.g., Barr et al. 2014b) but all of the Avalonian samples have some Mesoproterozoic peaks and some Ganderian samples, especially those from Grand Manan Island, have relatively few Mesoproterozoic peaks (Fig. 9).

The interpretation of Mesoproterozoic zircon prove-nance is challenging as illustrated in the Fredericton trough in New Brunswick and Maine northwest of the study area. Although the Fredericton trough is farther outboard of the Gondwanan margin within Ganderia than the current study areas (Fig. 1a), it provides a comparison dataset for areas to the southeast. Ludman et al. (2017, 2018) suggested that the Fredericton trough represents an independent basin that was not linked to the more southern New England ba-sins, and interpreted the detrital zircon signatures as being derived from dominantly Gondwanan sources. In contrast, Dokken et al. (2018) documented more mixed zircon prov-enance signature with significant Laurentian contributions. The differences in detrital zircon signatures are likely the result of along-strike variations in the source terranes, and support interpretations that Ganderia may have been a col-lection of continental fragments that accreted to the Lau-rentian margin at different times rather than forming one

coherent crustal block (Waldron et al. 2014, 2018, 2019; Pothier et al. 2015).

In Avalonia, Barr et al. (2012) noted a change in the provenance of detrital zircon grains through time, Neopro-terozoic units being characterized by lack of zircon grains with ages between 2.2 and 1.9 Ga, with the exception of a small peak at 2.0 Ga in the Neoproterozoic Broad River Group in the Caledonia belt (Fig. 9). By the early Cambri-an zircon grains of this age are more abundant. Fyffe et al. (2009) noted a similar trend in Neoproterozoic to Trema-docian sedimentary units in Ganderia, with 2.2 to 1.9 Ga ages becoming much more abundant overall in Cambrian– Ordovician samples. However, exceptions to the trend occur in Cambrian samples from both Ganderia and Avalonia. For example, a quartz arenite sample from the lower Cambrian Glen Falls Formation (Random Formation of Landing and Westrop 1998) in the Avalonian Caledonia belt (Fig. 8) con-tains few zircon grains ages between 2.2 to 1.9 Ga, and the dominant age population is ca. 537 Ma (Barr et al. 2012). The quartzite sample from the early Cambrian Matthews Lake Formation in the Ganderian New River belt (Fig. 8) also lacks zircon grains with ages between 2.2 and 1.9 Ga and is dominated by a single statistical age population at 539 Ma (Fyffe et al. 2009). The abundant volcanic rocks in the ca. 540 Ma Belleisle Bay Group in the New River belt are the most obvious source of the ca. 539 Ma zircon grains in the Matthews Lake quartzite, and along with the voluminous ca. 540 Ma plutonic rocks in the Brookville belt are the closest possible sources for the ca. 537 Ma zircons in the Glen Falls Formation, although 40Ar/39Ar cooling ages show that the Brookville plutons were not exposed at the time when the Glen Falls Formation was deposited (Dallmeyer and Nance 1992; White 1996).

The absence of Mesoproterozoic and Neoproterozoic zir-con grains in the quartzite samples from The Thoroughfare Formation is intriguing. Grains of those ages form the dom-inant populations in every other sample in this study, and in every other sedimentary sample from the region (Fig. 8). It is one of only 3 northern Appalachian samples known to have this type of signature, one from drill core recovered from Georges Bank, underlying Mesozoic sedimentary rocks (Kuiper et al. 2017) and the other from the Hutchins Island Quartzite in the Islesboro fault block in Penobscot Bay in coastal Maine (Reusch et al. 2018). As noted by Kui-per et al. (2017) and Reusch et al. (2018) these detrital sig-natures, with a predominant population at ca. 2.0 Ga and a small peak between ca. 2.8 Ga and 2.4 Ga, are remarkably similar to that of the Paleoproterozoic Taghdout Quartzite in Morocco on the West African craton. Similar peaks are also present in the spectrum for the Flagg Cove Formation reported by Fyffe et al. (2009), although that sample also contains abundant Mesoproterozoic, Neoproterozoic, and Paleozoic grains. Given its proximity, The Thoroughfare Formation seems the most likely source of the Paleoprotero-zic grains in the Flagg Cove Formation. The detrital spec-trum is very different from that of the Ashburn Formation of the Green Head Group in the Brookville belt, which like



other units of that belt (Martinon Formation and Brookville paragneiss) are dominated by Mesoproterozoic zircon grains (Fig. 8). This calls into question the previous correlation (e.g., Alcock 1948) of The Thoroughfare Formation with the Green Head Group and suggests that correlation with the Isleboro fault block in Penobscot Bay may be more likely.

CONCLUSIONS

New U–Pb data from detrital zircon grains in six clastic sedimentary and metasedimentary samples from Ganderian and Avalonian terranes in southern New Brunswick show both similarities and differences in Ediacaran and older age patterns. Like previously published data from southern New Brunswick, four of the samples (BL15-01, NB12-315, NB16-356, NB16-358) have prominent Late Ediacaran to earliest Cambrian zircon age populations, but the position of the modal peak varies from ca. 548 Ma to 618 Ma. The fifth sample (NB12-314) has an early Cambrian peak at ca. 522 Ma, and the sixth sample (GM10-01) has only Paleo-proterozoic peaks (Fig. 8). Some samples show a smatter-ing of ages back to ca. 800, but generally lack 800–1200 Ma zircon grains. The samples vary widely in their abundances of older Mesoproterozoic and Paleoproterozoic grains, and a few Archean zircon grains are present in some samples. No consistent differences are apparent between Avalonian and Ganderian samples. Because Gondwanan sources areas contain a wide range of ages which are broadly similar, com-bined with the many variables inherent in sediment erosion, transport, deposition, and recycling, the use of detrital zir-con age signatures to interpret from which part of Gondwa-na the Gondwana-derived components of the Appalachian orogen were derived may not be possible.

ACKNOWLEDGEMENTS

We thank Adrian Park for collecting the sample from the Balls Lake Formation. We are grateful to Brandon Boucher and Chris McFarlane for assisting Deanne van Rooyen with the U–Pb dating at the University of New Brunswick and for providing invaluable advice in processing and interpret-ing the age data. Brent Miller thanks the laboratory staff at Texas A & M University for their help. Comments and suggestions by journal reviewers Les Fyffe and John Wal-dron were helpful in improving the content and clarity of the manuscript and are much appreciated. This work was fund-ed mainly through research agreements between the Geo-logical Surveys Branch of the New Brunswick Department of Energy and Mines/Department of Energy and Resource Development and Acadia University and NSERC Discovery grants to Sandra Barr.

REFERENCES

Alcock, F.J. 1938. Geology of Saint John region, New Bruns-wick. Canada Department of Mines and Resources, Mines and Geology Branch, Geological Survey of Canada Memoir 216, 65 p.

Alcock, F.J. 1948, Grand Manan, New Brunswick: Geologic-al Survey of Canada, Map 965A, scale 1:63,360. https://doi.org/10.4095/107704

Archibald, D.B., Barr, S.M., Murphy, J.B., White, C.E., Mac-Hattie, T.G., Escarraga, E.A., Hamilton, M.A., and Mc-Farlane, C.R.M. 2013. Field relationships, petrology, age, and tectonic setting of the Ordovician West Barneys Riv-er Plutonic Suite, southern Antigonish Highlands, Nova Scotia, Canada. Canadian Journal of Earth Sciences, 50, pp. 727–745. https://doi.org/10.1139/cjes-2012-0158

Barr, S.M., Davis, D.W., Kamo, S., and White, C.E. 2003a. Significance of U–Pb detrital zircon ages in quartzite from peri-Gondwanan terranes, New Brunswick and Nova Scotia, Canada. Precambrian Research, 126, pp. 123–145. https://doi.org/10.1016/S0301-9268(03)00192-X

Barr, S.M., White, C.E., and Miller, B.V. 2003b. Age and geo-chemistry of Late Neoproterozoic and early Cambrian ig-neous rocks in southern New Brunswick: similarities and contrasts. Atlantic Geology, 39, pp. 55–73. https://doi.org/10.4138/1050

Barr, S.M., Hamilton, M.A., Samson, S.D., Satkoski, A.M., and White, C.E. 2012. Provenance variations in north-ern Appalachian Avalonia based on detrital zircon age patterns in Ediacaran and Cambrian sedimentary rocks, New Brunswick and Nova Scotia, Canada. Canadian Journal of Earth Sciences, 49, pp. 533–546. https://doi.org/10.1139/e11-070

Barr, S.M., Bartsch, C.J., Miller, B.V., and White, C.E. 2014a. U–Pb (zircon) age for the Beaver Harbour Porphyry, New River belt, southern New Brunswick, Atlantic Geology, 50, pp. 155–166. https://doi.org/10.4138/atlgeol.2014.010

Barr, S.M., White, C.E., Davis, D.W., McClelland, W.C., and van Staal, C.R. 2014b. Infrastructure and proven-ance of Ganderia: evidence from detrital zircon ages in the Brookville terrane, southern New Brunswick, Can-ada. Precambrian Research, 246, pp. 358–370. https://doi.org/10.1016/j.precamres.2014.03.022

Barr, S.M., Johnson, S.C., and White, C.E. 2014c. The on-go-ing Saint John geology enigma: Avalonia versus Ganderia in southern New Brunswick. GAC-MAC Fredericton 2014, post-meeting field guide, B6, 52 p.

Bartsch, C. 2005. Constraints on the tectonic evolution of the southern New River terrane and its relationship to other terranes in southern New Brunswick. Unpublished M.Sc. thesis, Acadia University, Wolfville, Nova Scotia,Canada, 169 p.

Black, R. 2005. Pre-Mesozoic geology of Grand Manan Is-land, New Brunswick. Unpublished MSc thesis, Acadia University, Wolfville, Nova Scotia, Canada, 227p.

Black, L.P., Kamo, S.L., Allen, C.M., Davis, D.W., Aleini-koff, J.N., Valley, J.W., Mundil, R., Campbell, I.H., Korsch,

https://doi.org/10.4095/107704

https://doi.org/10.4095/107704

https://doi.org/10.1139/cjes-2012-0158

https://doi.org/10.1016/S0301-9268(03)00192-X

https://doi.org/10.4138/1050

https://doi.org/10.4138/1050

https://doi.org/10.1139/e11-070

https://doi.org/10.1139/e11-070


https://doi.org/10.1016/j.precamres.2014.03.022

https://doi.org/10.1016/j.precamres.2014.03.022



R.J., Williams, I.S., and Foudoulis, C. 2004. Improved206Pb/238U microprobe geochronology by the monitor-ing of a trace-element-related matrix effect; SHRIMP,ID-TIMS, ELA-ICP-MS and oxygen isotope documen-tation for a series of zircon standards. Chemical Geol-ogy, 205, pp. 115–140. https://doi.org/10.1016/j.chem-geo.2004.01.003

Boyce, W.D. and Johnson, S. 2004: Early Cambrian trilobites from the Hanford Brook Formation, Public Landing, southern New Brunswick, Canada. Geological Associa-tion of Canada, Paleontology Division, Canadian Paleon-tology Conference Proceedings, 2, p. 14.

Cohen, K.M., Finney, S.C., Gibbard, P.L., and Fan, J.-X. (2013; updated 2018) The ICS International Chronos-tratigraphic Chart. Episodes, 36, pp. 199–204. URL http://www.stratigraphy.org/ICSchart/ChronostratCh-art2018-08.pd 10 March 2019.

Currie, K.L. 1988. The western end of the Avalon Zone in southern New Brunswick. Maritime Sediments and Atlantic Geology, 24, pp. 339–352. https://doi.org/10.4138/1661

Dallmeyer, R.D. and Nance, R.D., 1992. Tectonic implica-tions of 40Ar/39Ar mineral ages from Late Precambrian–Cambrian plutons, Avalon Composite Terrane, southern New Brunswick, Canada. Canadian Journal of Earth Sci-ences, 29, pp. 2445–2462. https://doi.org/10.1139/e92-192

Dickinson, W.R. and Gehrels, G.E. 2010. Insights into North American Paleogeography and Paleotectonics from U–Pb ages of detrital zircons in Mesozoic strata of the Colorado Plateau, USA. International Journal of Earth Sciences, 99, pp. 1247–1265. https://doi.org/10.1007/s00531-009-0462-0

Dokken, R., Waldron, J., and Dufrane, A. 2018. Detrital zircon geochronology of the Fredericton Trough, New Brunswick, Canada: Constraints on the Silurian closure of remnant Iapetus Ocean. American Journal of Science, 318, pp. 684–725. https://doi.org/10.2475/06.2018.03

Fyffe, L.R. 2014. The Grand Manan terrane of New Bruns-wick: Tectonostratigraphy and relationship to the Gondwanan margin of the Iapetus Ocean. Geoscience Canada, 41, pp. 483–502. https://doi.org/10.12789/geo-canj.2014.41.051

Fyffe, L.R., Barr, S.M., Johnson, S.C., McLeod, M.J., McNicoll, V.J., Valverde-Vaquero, P., van Staal, C.R., and White, C.E. 2009. Detrital zircon ages from Neoprotero-zoic and Early Paleozoic conglomerate and sandstone units of New Brunswick and coastal Maine: implications for the tectonic evolution of Ganderia. Atlantic Geology, 45, pp. 110–144. https://doi.org/10.4138/atlgeol.2009.006

Fyffe, L.R., Johnson, S.C., and van Staal, C.R. 2011. A re-view of Proterozoic to Early Paleozoic lithotectonic ter-ranes in the northeastern Appalachian orogen of New Brunswick, Canada, and their tectonic evolution during Penobscot, Taconic, Salinic, and Acadian orogensis. At-lantic Geology, 47, pp. 211–248. https://doi.org/10.4138/atlgeol.2011.010

Hayes, A.O. and Howell, B.F. 1937. Geology of Saint John, New Brunswick.Geological Society of America Special Paper 5, 146 p.

Hewitt, M.D. 1993. Geochemical constraints on the source of sedimentary and volcanic sequences, Grand Manan Is-land, New Brunswick. Department of Geology. Oneonta, NY, Hartwick College, 28 p.

Hibbard, J.P., van Staal, C.R., Rankin, D.W., and Williams, H. 2006.Lithotectonic map of the Appalachian orogen,Canada — United States of America: Geological Sur-vey of Canada Map 02096A, 2 sheets, scale 1:1 500 000.https://doi.org/10.4095/221932

Hiess, J., Condon, D.J., McLean, N., and Noble, S.R. 2012. 238U/235U systematics in terrestrial uranium-bearing minerals. Science, 335, pp. 1610–1614. https://doi.org/10.1126/science.1215507

Hilyard, M. 1992. The geologic significance of Grand Man-an Island, New Brunswick. Department of Geology. One-onta, NY, Hartwick College, 27 p.

Hodgins, M.L. 1994. Trace element, REE, and Nd isotopic variations in metavolcanic and metasedimentary sequen-ces, Grand Manan Island, New Brunswick. Department of Geology. Oneonta, NY, Hartwick College, 57 p.

Jaffey, A. H., K. F. Flynn, L. F. Glendenin, W. C. Bentley, and A. M. Essling . 1971, Precision measurements of half‐lives and specific activities of 235U and 238U, Physic-al Review C, 4, pp. 1889–1906. https://doi.org/10.1103/PhysRevC.4.1889

Johnson, S.C. 2001. Contrasting geology in the Pocologan River and Long Reach areas: implications for the New River belt and correlations in southern New Brunswick and Maine. Atlantic Geology, 37, pp. 61–79. https://doi.org/10.4138/1972

Johnson, S.C., Dunning, G.R., and Miller, B.V. 2018. U–Pb geochronology and geochemistry from the northeastern New River belt, southern New Brunswick, Canada: sig-nificance of the Almond Road Group to the Ganderian platformal margin. Atlantic Geology, 54, pp. 147–170. https://doi.org/10.4138/atlgeol.2018.005

Kuiper, Y.D., Thompson. M.D., Barr, S.M., White, C.E., Hepburn, J.C., and Crowley, J.L. 2017. Detrital zircon evidence for Paleoproterozoic West African crust along the eastern North American continental margin, Geor-ges Bank, offshore Massachusetts, USA. Geology, 45, pp. 811–814. https://doi.org/10.1130/G39203.1

Landing, E. 1996. Avalon: Insular continent by the latest Precambrian. In Avalonian and Related Peri-Gond-wanan Terranes of the Circum-North Atlantic. Edited by R.D. Nance, and M.D. Thompson. Geological Society of America, Special Paper, 304, pp. 29–63. https://doi.org/10.1130/0-8137-2304-3.29

Landing, E. and Westrop, S.R. 1998. Avalon 1997-The Cam-brian Standard. Third international field conference of the Cambrian chronostratigraphy working group and I.G.C.P. Project 366. New York State Bulletin 492, 92 p.

Landing, E., Bowring, S. A., Davidek, K. L., Westrop, S. R., Geyer, G., and Heldmaier, W. 1998. Duration of the early

https://doi.org/10.1016/j.chemgeo.2004.01.003

https://doi.org/10.1016/j.chemgeo.2004.01.003

http://www.stratigraphy.org/ICSchart/ChronostratChart2018-08.pd

http://www.stratigraphy.org/ICSchart/ChronostratChart2018-08.pd

https://doi.org/10.4138/1661

https://doi.org/10.4138/1661

https://doi.org/10.1139/e92-192

https://doi.org/10.1139/e92-192

https://doi.org/10.1007/s00531-009-0462-0

https://doi.org/10.1007/s00531-009-0462-0

https://doi.org/10.2475/06.2018.03

https://doi.org/10.12789/geocanj.2014.41.051

https://doi.org/10.12789/geocanj.2014.41.051




https://doi.org/10.4095/221932

https://doi.org/10.1126/science.1215507

https://doi.org/10.1126/science.1215507

https://doi.org/10.1103/PhysRevC.4.1889

https://doi.org/10.1103/PhysRevC.4.1889

https://doi.org/10.4138/1972

https://doi.org/10.4138/1972


https://doi.org/10.1130/G39203.1

https://doi.org/10.1130/0-8137-2304-3.29

https://doi.org/10.1130/0-8137-2304-3.29



Cambrian: U–Pb ages of volcanic ashes from Avalon and Gondwana. Canadian Journal of Earth Sciences, 35, pp. 329–38. https://doi.org/10.1139/cjes-35-4-329

Landing, E., Johnson, S., and Geyer, G. 2008. Faunas and Cambrian volcanism on the Avalonian marginal plat-form, southern New Brunswick. Journal of Paleontology, 82, pp. 884–905. https://doi.org/10.1666/07-007.1

Ludman, A., Hopeck, J., and Berry, H. 2017. Provenance and paleogeography of post-Middle Ordovician pre-Devon-ian sedimentary basins on the Gander composite terrane, eastern and east-central Maine: implications for Silurian tectonics in the northern Appalachians. Atlantic Geology, 53, p. 63–85. https://doi.org/10.4138/atlgeol.2017.003

Ludman, A., Aleinikoff, J., Berry, H.N. IV, and Hopeck, J.T. 2018. SHRIMP U–Pb zircon evidence for age, proven-ance, and tectonic history of early Paleozoic Ganderian rocks, east-central Maine, USA. Atlantic Geology, 54, pp. 335–387. https://doi.org/10.4138/atlgeol.2018.012

Matthew, G.F. 1891. On some causes which may have influ-enced the spread of the Cambrian faunas. Canadian Rec-ord of Science, 4, pp. 255–269.

McFarlane, C.R.M. and Luo, Y. 2012. Modern analytical fa-cilities: U–Pb geochronology using 193 nm Excimer LA-ICP-MS optimized for in-situ accessory mineral dating in thin sections. Geoscience Canada, 39, pp. 158–172.

McLeod, M.J., Winchester, J.A., and Ruitenberg, A.A. 1994. Geochemistry of the Annidale Group: implications for the tectonic setting of Lower Ordovician volcanism in southwestern New Brunswick. Atlantic Geology, 30, pp. 87–94. https://doi.org/10.4138/2122

Miller, B.V., Barr, S.M., and Black, R.S. 2007. Neoprotero-zoic and Cambrian U–Pb (zircon) ages from Grand Man-an Island, New Brunswick: Implications for stratigraphy and northern Appalachian terrane correlations. Can-adian Journal of Earth Sciences, 44, 911–923. https://doi.org/10.1139/e06-132

Paces, J.B. and Miller, J.D. 1993. Precise U–Pb ages of of Duluth Complex and related mafic intrusions, northeast-ern Minnesota: geochronological in-sights into physic-al, petrogenetic, paleomagnetic and tectonomagmatic processes associated with the 1.1 Ga mid-continent rift system. Journal of Geophysical Research, 98, pp.13997–14013. https://doi.org/10.1029/93JB01159

Palacios, T., Jensen, S., Barr, S.M., White, C.E., and Miller, R. 2016. Acritarchs from the Hanford Brook Formation,New Brunswick, Canada: new biochronological con-straint on the Protolenus elegans Zone and the CambrianSeries 2–3 transition. Geological Magazine, 154, pp. 571–590. https://doi.org/10.1017/S0016756816000224

Park, A.F., Treat, R.L., Barr, S.M., White, C.E., Miller, B.V., Reynolds, P.H., and Hamilton, M.A. 2014. Structural set-ting and age of the Partridge Island block, southern New Brunswick, Canada: a link to the Cobequid Highlands of northern mainland Nova Scotia. Canadian Journal of Earth Sciences, 51, pp. 1–24. https://doi.org/10.1139/cjes-2013-0120

Paton, C., Woodhead, J., Hellstrom, J., Hergt, J.M., Greig, A.,

and Maas, R. 2010. Improved laser ablation U–Pb zircon geochronology through robust downhole fractionation correction. Geochemistry, Geophysics, Geosystems, 11, Q0AA06, 36 p. https://doi.org/10.1029/2009GC002618

Paton, C., Hellstrom, J., Paul, B., Woodhead, J., and Hergt, J.M. 2011. Iolite: freeware for the visualisation and pro-cessing of mass spectrometric data. Journal of Analytic-al Atomic Spectrometry, 26, pp. 2508–2518. https://doi.org/10.1039/c1ja10172b

Pe-Piper, G. and Wolde, B. 2000. Geochemistry of meta-volcanic rocks of the Ross Island and Ingalls Head for-mations, Grand Manan Island, New Brunswick. Atlantic Geology, 36, pp. 103–116. https://doi.org/10.4138/2014

Petrus, J.A. and Kamber, B.S. 2012. VizualAge: A novel ap-proach to laser ablation ICP-MS U–Pb geochronology data reduction. Geostandards and Geoanalytical Re-search, 36, pp. 247–270. https://doi.org/10.1111/j.1751-908X.2012.00158.x

Plint, A.G. and van der Poll, H.W. 1982. Alluvial fan and piedmont sedimentation in the Tynemouth Creek For-mation (Lower Pennsylvanian) of southern New Bruns-wick. Maritime Sediments and Atlantic Geology, 18, pp. 104–128. https://doi.org/10.4138/1393

Pollock, J.C., Hibbard, J.P., and Sylvester, P.J. 2009. Ear-ly Ordovician rifting of Avalonia and birth of the Rheic Ocean: U–Pb detrital zircon constraints from Newfound-land. Journal of the Geological Society, 166, pp. 501–515. https://doi.org/10.1144/0016-76492008-088

Pollock, J.C., Barr, S.M., and Sylvester, P.J. 2015. Lu–Hf zir-con and Sm–Nd whole rock isotope constraints on the extent of juvenile arc crust in Avalonia: examples from Newfoundland and Nova Scotia, Canada. Canadian Journal of Earth Sciences, 52, pp. 161–181. https://doi.org/10.1139/cjes-2014-0157

Pothier, H.D., Waldron, J.W.F., Schofield, D.I., and DuFrane, S.A. 2015. Peri-Gondwanan terrane interactions record-ed in the Cambrian–Ordovician detrital zircon geo-chronology of North Wales. Gondwana Research, 28, pp. 987–1001. https://doi.org/10.1016/j.gr.2014.08.009

Reusch, D.N., Holm-Denoma, C.S., and Slack, J.F. 2018. U–Pb zircon geochronology of Proterozoic and Paleozoic rocks, North Islesboro, coastal Maine (USA): links to West Africa and Penobscottian orogenesis in southeast-ern Ganderia? Atlantic Geology, 54, pp. 189–224. https://doi.org/10.4138/atlgeol.2018.007

Satkoski, A.M., Barr, S.M., and Samson, S.D. 2010. Prov-enance of Late Neoproterozoic and Cambrian sediments in Avalonia: Constraints from detrital zircon ages and Sm–Nd isotopic compositions in southern New Bruns-wick, Canada. The Journal of Geology, 118, pp. 187–200. https://doi.org/10.1086/649818

Schmitz, M. D. 2012. Radiometric ages used in GTS 2012. In The Geologic Time Scale 2012. Edited by F. M. Gradstein, J. G. Ogg, M. Schmitz, and G. Ogg). Amsterdam: Elsevier pp. 1045–77. https://doi.org/10.1016/B978-0-444-59425-9.15002-4

Tanoli, S.K. and Pickerill, R.K. 1988. Lithostratigraphy of the

https://doi.org/10.1139/cjes-35-4-329

https://doi.org/10.1666/07-007.1



https://doi.org/10.4138/2122

https://doi.org/10.1139/e06-132

https://doi.org/10.1139/e06-132

https://doi.org/10.1029/93JB01159

https://doi.org/10.1017/S0016756816000224



https://doi.org/10.1029/2009GC002618

https://doi.org/10.1039/c1ja10172b

https://doi.org/10.1039/c1ja10172b

https://doi.org/10.4138/2014

https://doi.org/10.1111/j.1751-908X.2012.00158.x

https://doi.org/10.1111/j.1751-908X.2012.00158.x

https://doi.org/10.4138/1393

https://doi.org/10.1144/0016-76492008-088



https://doi.org/10.1016/j.gr.2014.08.009



https://doi.org/10.1086/649818

https://doi.org/10.1016/B978-0-444-59425-9.15002-4

https://doi.org/10.1016/B978-0-444-59425-9.15002-4



Cambrian–Lower Ordovician Saint John Group, south-ern New Brunswick. Canadian Journal of Earth Sciences, 25, pp. 669–690. https://doi.org/10.1139/e88-064

Thomas, W.A., Gehrels, G. E., Greb, S.F., Nadon, G.C., Sat-koski, A.M., and Romero, M.C. 2017. Detrital zircons and sediment dispersal in the Appalachian foreland. Geosphere, 13, pp. 2206–2230. https://doi.org/10.1130/GES01525.1

Thompson, M.D., Ramezani, J., Barr, S.M., and Hermes, O.D. 2010. High precision U–Pb dates for Ediacarangranitoid rocks in SE New England: Revised magmaticchronology and correlation with other Avalonian ter-ranes. In From Rodinia to Pangea: The LithotectonicRecord of the Appalachian Region. Edited by R.P. Tol-lo, M.J. Bartholomew, J.P Hibbard, and P.M. Karabinos.Geological Society of America Memoir, 206, pp. 231–250.https://doi.org/10.1130/2010.1206(11)

van Staal, C.R., Barr, S.M., Fyffe, L.R., Johnson, S.C., Park, A.F., White, C.E., and Wilson, R.A. 2011. The definingtectonic elements of Ganderia in New Brunswick. Geo-logical Association of Canada - Mineralogical Association of Canada - Society of Economic Geologists -Society forGeology Applied to Mineral Deposits Joint Annual Meet-ing, Ottawa, 2011, Guidebook to Field trip 1B, 30 p.

van Rooyen, D., Barr, S.M., White, C.E., and Hamilton, M.A. 2019. New U–Pb age constraints on the geological history of the Ganderian Bras d’Or terrane, Cape Breton Island, Nova Scotia. Canadian Journal of Earth Sciences. 56, pp. 829–847. https://doi.org/10.1139/cjes-2018-0248

Waldron, J. W. F., Schofield, D. I., Dufrane, S. A., Floyd, J. D., Crowley, Q. G., Simonetti, A., Dokken, R. J., and Pothier, H. D. 2014. Ganderia–Laurentia collision in the Caledonides of Great Britain and Ireland: Journal of the Geological Society, London, 171, pp. 555–569. https://doi.org/10.1144/jgs2013-131

Waldron, J. W. F., Schofield, D. I., and Murphy, J. B. 2018. Diachronous Palaeozoic accretion of peri-Gondwanan terranes at the Laurentian margin. In Fifty Years of the Wilson Cycle Concept in Plate Tectonics. Edited by R.W. Wilson, G.A. Houseman, K.J.W. McCaffrey, A.G. Doré, and S.J.H. Buiter. Geological Society of London, Spe-cial Publication, 470, published online 29 March 2018. https://doi.org/10.1144/SP470.11

Waldron, J.W.F., Schofield, D.I., Pearson, G., Chiranjeeb Sarkar, C., Luo, Y., and Dokken, R. 2019. Detrital zircon characterization of early Cambrian sandstones from East Avalonia and SE Ireland: implications for terrane affin-ities in the peri-Gondwanan Caledonides. Geological Magazine, 156, pp. 1217–1232. https://doi.org/10.1017/S0016756818000407

White, C.E., 1996. Geology, geochronology, and tectonic evolution of the Brookville terrane, southern New Bruns-wick. Unpublished Ph.D. thesis. Dalhousie University, Halifax, Nova Scotia, Canada, 513 p.

Wiedenbeck, M., Alle, P., Corfu, F., Griffin, W.L., Meier, M., Oberli, F., von Quadt, A., Roddick, J.C., and Spiegel, W. 1995. Three natural zircon standards for U–Th–Pb,Lu–Hf, trace element and REE analyses. GeostandardsNewsletter 19, pp. 1–23. https://doi.org/10.1111/j.1751-908X.1995.tb00147.x

Yoon, T.N. 1970. The Cambrian and Lower Ordovician stra-tigraphy of the Saint John area, New Brunswick. Unpub-lished M.Sc. thesis, University of New Brunswick, Fred-ericton, New Brunswick, Canada, 92 p.

Editorial responsibility: David P. West, Jr.

APPENDIX

laser esi/NWR 193 nm 4 ns excimerbackground/washout times 14 s /8 slaser repetition rate 15 Hzspot size/shape 30 µm / circlefluence 3.25 J cm-2

carrier/makeup gas 0.6 l/min He, 0.8 l/min Ar

mass spectrometer Thermo Scientific iCAP RQplasma RF power 1550 Wtotal duty cycle 195 ms

isotopes measured (dwell times in ms)48Ti (10), 88Sr (10), 96Zr (2.5), 179Hf (2.5), 202Hg (10), 204Pb (20), 206Pb (20), 207Pb (50), 208Pb (10), 232Th (10), 235U (20), 238U (10), 232Th16O (10), 238U16O (10)

Table A1. Instrument settings and run parameters for analyses completed at Texas A & M University.

https://doi.org/10.1139/e88-064

https://doi.org/10.1130/GES01525.1

https://doi.org/10.1130/GES01525.1

https://doi.org/10.1130/2010.1206(11


https://doi.org/10.1144/jgs2013-131

https://doi.org/10.1144/jgs2013-131

https://doi.org/10.1144/SP470.11

https://doi.org/10.1017/S0016756818000407

https://doi.org/10.1017/S0016756818000407

https://doi.org/10.1111/j.1751-908X.1995.tb00147.x

https://doi.org/10.1111/j.1751-908X.1995.tb00147.x



Tabl

eA2.

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b ge

ochr

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ogic

dat

a fo

r sam

ples

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10-0

1, N

B12-

314,

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at T

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iller

).

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ttle

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t Roa

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503

2336

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rid

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727

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559

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486

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99.1

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354

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180.

0668

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749

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560

735

780

110

561

3250

313

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003

176

988

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1.85

9980

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0022

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640.

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6583

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±2σ2

%

con

Isot

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lysis

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/ 23

2 Th±2σ2

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206 Pb

/ 23

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/2

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ATLANTIC GEOLOGY · VOLUME 55 · 2019 296Ta

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940.

0027

0.7

0.03

20.

0861

0.00

230.

3018

705

535

2457

010

053

819

532

1498.9

NB3

14a_

067

18.5

111

621.

7920

000

4.77

0.48

0.02

950.

0015

0.07

380.

0037

0.79

70.

044

0.07

890.

0032

0.5

587

3010

3039

595

2549

019

86.4

NB3

14a_

068

5145

980.

4629

00.

624

0.03

60.

064

0.01

0.55

90.

025

9.5

1.5

0.12

90.

014

0.5

1250

190

4399

2124

3782

779

7832.0

NB3

14a_

070

61.6

225

235

0.96

1500

02.

990.

130.

0281

10.

0009

60.

0626

0.00

20.

749

0.03

0.08

70.

0022

0.60

3742

456

019

682

6956

617

537

1394.9

NB3

14a_

071

140

144

319

0.45

640

0.98

0.1

0.04

910.

0028

0.36

60.

035

5.41

0.61

0.10

440.

0034

0.5

967

5436

9022

1810

120

640

2035.4

NB3

14a_

072

60.9

408

233

1.75

1100

05.

260.

270.

0283

40.

0005

40.

0642

20.

001

0.72

40.

016

0.08

190.

0017

0.73

7672

956

4.8

1174

433

552.

99.

450

7.6

9.9

91.8

NB3

14a_

073

46.1

155.

718

80.

8341

002.

960.

110.

0266

90.

0006

60.

0587

0.00

140.

706

0.01

70.

0872

0.00

150.

3704

538

532

1354

123

541.

810

539

8.9

99.5

NB3

14a_

074

268.

219

3711

451.

6990

000

5.21

0.13

0.02

551

0.00

078

0.06

040.

0018

0.64

60.

022

0.07

790.

0013

0.48

4024

509

1562

470

506

1448

3.5

7.7

65.4

NB3

14a_

075

5124

518

41.

3312

000

4.02

0.19

0.03

016

0.00

099

0.06

970.

0033

0.81

60.

042

0.08

530.

0017

0.5

600

2089

924

604

2252

7.6

1087.4

NB3

14a_

076

171.

712

1065

51.

8521

000

4.63

0.12

0.02

864

0.00

094

0.05

960.

0011

0.58

50.

017

0.07

060.

0019

0.78

5167

457

118

582

3346

7.5

1144

011

94.1

NB3

14a_

077

5826

812

62.

1325

803.

680.

110.

049

0.00

280.

1188

0.00

31.

343

0.04

90.

0829

0.00

160.

596

655

1932

4586

918

513.

59.

659.1

NB3

14a_

078

537

1170

1400

0.84

1560

1.78

50.

063

0.04

330.

003

0.14

990.

0043

1.73

0.07

40.

0834

0.00

180.

585

658

2339

2510

1827

516.

111

50.7

NB3

14a_

079

8851

633

11.

5650

000

4.39

0.14

0.02

992

0.00

079

0.06

840.

0017

0.76

30.

025

0.08

120.

0019

0.5

596

1587

051

575

1450

311

87.5

NB3

14a_

080

19.1

6466

0.97

5100

2.93

0.19

0.02

820.

0016

0.06

790.

0035

0.8

0.04

70.

0858

0.00

250.

556

331

850

2659

626

531

1589.1

NB3

14a_

081

76.8

207.

127

0.9

0.76

5500

2.28

90.

062

0.03

052

0.00

10.

0912

0.00

321.

067

0.03

90.

0848

0.00

140.

560

820

1445

6773

519

524.

78.

271.4

NB3

14a_

082

8840

031

81.

2662

003.

060.

270.

0305

0.00

250.

095

0.01

20.

980.

150.

0746

0.00

240.

560

749

1450

2768

473

464

1467.8

NB3

14a_

083

32.4

168

126

1.33

1050

04.

382

0.11

0.02

733

0.00

057

0.05

90.

0011

0.70

50.

015

0.08

659

0.00

110.

4929

411

545

1155

641

541.

49.

153

5.3

6.7

98.9

NB3

14a_

084

2298

861.

1450

03.

50.

120.

0272

40.

0007

90.

0594

0.00

230.

677

0.02

0.08

380.

0016

0.23

2248

154

316

560

2852

714

518.

79.

898.4

NB3

14a_

085

3291

102

0.89

5200

2.44

0.15

0.03

20.

0016

0.08

480.

0039

1.01

50.

066

0.08

720.

0034

0.5

636

3213

0189

710

3253

920

75.9

NB3

14a_

086

855

1241

2220

0.56

950

1.18

90.

054

0.04

140.

0024

0.21

60.

019

2.59

0.28

0.08

60.

002

0.5

820

4729

0029

1274

7253

212

41.8

NB3

14a_

087

349

350

710

0.49

310

0.87

0.13

0.05

010.

002

0.45

60.

051

71.

10.

1082

0.00

670.

598

838

4010

200

2040

160

661

3932.4

NB3

14a_

089

6514

447

.83.

0143

000

11.7

60.

370.

1516

0.00

370.

2046

0.00

2315

.27

0.31

0.54

10.

0089

0.83

3003

228

5164

2861

1828

3019

2786

3798.4

NB3

14a_

090

2915

610

41.

5090

000

4.31

0.34

0.02

940.

002

0.06

670.

0032

0.78

30.

051

0.08

570.

0048

0.69

5947

858

540

820

3058

630

530

2990.4

NB3

14a_

091

5320

722

00.

9451

000

2.89

0.23

0.02

435

0.00

092

0.06

380.

0022

0.66

90.

049

0.07

670.

0062

0.90

4448

948

618

732

7351

930

476

3791.7

NB3

14a_

092

43.9

194

153

1.27

4300

3.57

60.

110.

0309

0.00

10.

073

0.00

210.

872

0.02

90.

0868

0.00

170.

561

620

1005

3163

615

536.

69.

884.4

NB3

14a_

093

3127

385

3.21

5000

6.7

1.4

0.03

990.

0043

0.08

830.

0098

0.96

0.13

0.07

880.

0028

0.5

791

8413

2023

067

667

489

1772.3

NB3

14a_

094

26.4

418

5.1

102.

41.

8198

005.

980.

150.

0277

90.

0006

40.

0582

60.

0009

90.

696

0.01

50.

0865

60.

0012

0.61

5696

554

1352

932

535.

58.

853

5.1

7.3

99.9

NB3

14a_

095

93.6

343

376

0.91

1640

03.

090.

085

0.02

702

0.00

043

0.05

775

0.00

088

0.67

40.

013

0.08

496

0.00

110.

6155

832

538.

98.

551

233

522.

77.

952

5.6

6.8

100.6

NB3

14a_

096

265

1022

681

1.50

1790

2.85

0.14

0.04

210.

0014

0.12

80.

0062

1.40

30.

086

0.07

980.

0016

0.5

833

2820

4033

883

3649

4.8

9.3

56.0

NB3

14a_

097

5538

420

71.

8670

000

5.02

0.34

0.02

890.

0014

0.06

440.

0031

0.66

10.

025

0.07

640.

0021

0.06

3073

557

528

731

8651

515

474

1292.0

NB3

14a_

098

49.7

132

841.

5782

02.

130.

190.

0733

0.00

60.

209

0.01

82.

930.

390.

0981

0.00

420.

514

3011

028

0034

1342

8860

324

44.9

Mea

sure

d co

ncen

trat

ions

1Is

otop

ic ra

tios

Cal

cula

ted

age

s (M

a)

Pb

(ppm

)±2σ2

207 Pb

/ 20

6 Pb±2σ2

207 Pb

/ 23

5 U±2σ2

Ana

lysis

Id

entif

ier

±2σ2

206 Pb

/ 23

8 U±2σ2

%

con

208 Pb

/2

32Th

±2σ2

207 Pb

/2

06Pb

±2σ2

207 Pb

/ 23

5 U±2σ2

Rho3

206 Pb

/ 23

8 U

U

(ppm

)Th

(p

pm)

U/T

h20

6 Pb/

20

4 Pb

208 Pb

/ 20

6 Pb±2σ2

208 Pb

/ 23

2 Th



Tabl

eA2.

Con

tinue

d.

NB3

14a_

099

64.6

333

230

1.45

3700

4.31

0.15

0.02

899

0.00

067

0.06

460.

0022

0.73

60.

022

0.08

350.

0016

0.08

8052

657

813

740

3455

913

516.

79.

592.4

NB3

14a_

100

3018

710

61.

7615

000

5.66

0.44

0.02

750.

0017

0.06

070.

0017

0.70

50.

029

0.08

470.

0024

0.73

3801

754

834

623

6154

117

524

1496.9

NB3

14a_

101

10.9

5240

1.30

1800

03.

470.

270.

0296

0.00

160.

0697

0.00

430.

782

0.05

20.

0819

0.00

230.

559

032

910

3558

630

508

1486.7

NB3

14a_

102

4428

016

91.

6619

000

5.1

0.22

0.02

740.

0011

0.05

940.

0017

0.67

80.

020.

0839

0.00

160.

3686

476

546

2157

463

525

1251

9.4

9.4

98.9

NB3

14a_

103

52.4

184.

420

8.5

0.88

4900

2.95

30.

070.

0271

80.

0005

40.

0598

90.

0009

90.

708

0.01

40.

0856

70.

0012

0.56

6763

542.

111

590

3654

2.9

8.4

529.

96.

997.6

NB3

14a_

104

7.3

105

29.7

3.54

8000

010

.84

0.53

0.02

540.

0013

0.05

790.

0021

0.62

0.01

90.

0781

0.00

170.

0730

491

508

2651

382

489

1248

4.9

1099.2

NB3

14a_

105

27.3

8483

1.01

3100

2.75

0.38

0.03

220.

0022

0.12

30.

019

1.3

0.18

0.07

770.

0025

0.5

641

4419

0037

835

7748

215

57.7

NB3

14a_

106

59.1

325

244

1.33

4100

4.85

0.32

0.02

740.

0009

40.

0602

0.00

130.

694

0.01

70.

0837

0.00

130.

4927

479

546

1860

346

534.

510

517.

97.

896.9

NB3

14a_

107

8032

570.

5621

30.

590.

022

0.15

20.

027

0.65

10.

027

16.9

1.7

0.18

80.

016

0.5

2830

460

4622

3829

0395

1109

8838.2

NB3

14a_

108

137

100

201

0.50

310

0.80

90.

056

0.08

130.

0093

0.44

50.

023

8.3

1.1

0.13

30.

010.

515

7017

040

5383

2220

120

826

7137.2

NB3

14a_

109

250

121

570

0.21

161

0.59

10.

063

0.05

10.

011

0.60

50.

029

10.3

1.3

0.12

40.

014

0.5

1000

210

4514

7224

4011

075

180

30.8

NB3

14a_

110

156

6717

80.

3822

80.

610.

028

0.09

430.

0053

0.62

70.

029

14.4

1.2

0.16

60.

011

0.5

1819

9845

7739

2765

7598

663

35.7

NB3

14a_

111

167

202

336

0.60

1550

1.48

0.36

0.05

010.

0067

0.27

80.

065

41.

20.

0959

0.00

510.

599

013

030

6046

015

0025

059

030

39.3

NB3

14a_

112

179

242

234

1.03

457

1.19

30.

089

0.11

20.

015

0.33

30.

026

5.7

0.83

0.12

050.

0092

0.5

2210

310

3570

4018

8013

073

152

38.9

NB3

14a_

113

640

1100

1570

0.70

605

1.24

90.

056

0.04

820.

0028

0.26

60.

018

3.41

0.42

0.09

420.

0066

0.5

951

5332

5022

1497

9558

038

38.7

NB3

14a_

114

179

1150

530

2.17

1010

03.

660.

890.

0324

0.00

490.

087

0.02

0.76

0.16

0.06

450.

003

0.5

644

9512

8044

056

990

403

1870.8

NB3

14a_

115

64.9

230.

826

0.4

0.89

1460

02.

917

0.07

40.

0269

70.

0005

30.

0583

0.00

130.

686

0.01

70.

0852

90.

0013

0.46

2268

537.

910

529

2352

9.7

1052

7.6

7.8

99.6

NB3

14a_

116

49.2

310.

919

8.9

1.56

400

4.95

0.15

0.02

697

0.00

079

0.05

920.

0015

0.68

20.

018

0.08

430.

0015

0.39

5202

453

816

566

5553

012

521.

69

98.4

NB3

14a_

117

50.2

188.

515

8.1

1.19

600

3.20

70.

087

0.03

421

0.00

087

0.07

960.

0019

0.98

10.

028

0.08

980.

0015

0.5

680

1711

7424

695

1455

49.

279.7

NB3

14a_

118

77.8

132

297

0.44

780

1.22

0.07

90.

0296

0.00

180.

257

0.01

93.

190.

370.

0842

0.00

330.

559

737

3100

130

1389

7952

119

37.5

NB3

14a_

119

132

570

420

1.36

1930

03.

190.

480.

0356

0.00

940.

090.

036

1.06

0.55

0.08

150.

0066

0.5

700

180

1120

2567

020

050

539

75.4

NB3

14a_

120

136

368

309

1.19

1090

2.1

0.12

0.04

520.

0038

0.15

50.

012

1.68

0.18

0.07

940.

0091

0.5

893

7324

0035

997

6549

254

49.3

NB3

14a_

121

5227

213

71.

9958

004.

840.

210.

0347

0.00

160.

0776

0.00

470.

897

0.06

50.

0843

0.00

290.

568

931

1130

120

649

3652

217

80.4

NB3

14a_

122

4324

012

51.

9255

003.

31.

30.

054

0.02

0.12

0.06

41.

310.

740.

0783

0.00

710.

510

6039

016

4026

800

320

486

4260.7

NB3

14a_

123

2616

010

31.

5541

000

3.1

1.4

0.04

10.

017

0.09

60.

061

1.02

0.7

0.07

660.

0062

0.5

810

330

1300

1100

690

330

476

3769.0

NB3

14a_

124

43.8

191.

916

2.3

1.18

8600

3.6

0.11

0.02

945

0.00

10.

0594

0.00

150.

709

0.01

70.

0872

0.00

190.

3942

885

586

2057

127

543.

610

539.

111

99.2

NB3

14a_

125

9126

716

51.

6216

003.

110.

390.

0526

0.00

540.

118

0.01

81.

40.

270.

0869

0.00

860.

510

4010

018

7029

088

011

053

751

61.0

NB3

14a_

126

100

460

420

1.10

1800

03.

040.

140.

0246

90.

0006

70.

063

0.00

290.

610.

027

0.07

080.

0028

0.40

111

493

1370

028

483

1844

117

91.3

NB3

14a_

127

10.3

6133

1.85

3000

04.

250.

50.

0316

0.00

340.

0671

0.00

220.

720.

120.

079

0.01

30.

562

966

840

6955

175

488

7788.6

NB3

14a_

128

3615

710

91.

4460

000

3.18

0.19

0.03

390.

0019

0.06

990.

0022

0.8

0.15

0.07

820.

0082

0.5

673

3692

029

588

7848

550

82.5

NB3

14a_

129

5145

016

72.

6910

0000

6.41

0.33

0.03

30.

0011

0.06

660.

0026

0.72

50.

037

0.07

930.

0028

0.5

655

2180

979

552

2249

217

89.1

NB3

14a_

130

6548

022

82.

1118

000

4.93

0.18

0.02

987

0.00

095

0.05

80.

0011

0.57

10.

022

0.07

10.

0028

0.88

1908

959

519

527

3045

814

442

1796.5

NB3

14a_

131

8841

728

91.

4410

600

3.75

0.28

0.03

340.

0037

0.08

20.

010.

980.

160.

0855

0.00

440.

566

373

1170

210

679

7552

926

77.9

NB3

14a_

132

52.1

220.

617

8.3

1.24

700

3.26

0.15

0.03

132

0.00

099

0.07

480.

0025

0.85

50.

030.

0831

0.00

190.

562

319

1050

6662

616

514.

311

82.2

NB3

14a_

133

4626

6.9

183

1.46

6400

4.49

0.18

0.02

783

0.00

096

0.05

920.

0013

0.65

70.

017

0.08

040.

0015

0.55

4515

855

519

569

3651

2.2

1049

8.2

8.9

97.3

NB3

14a_

134

83.1

362

259.

71.

3921

003.

511

0.09

70.

0342

0.00

110.

0739

0.00

180.

865

0.02

10.

0856

0.00

20.

568

022

1027

4763

212

529

1283.7

NB3

14a_

135

215

450

620

0.73

431

1.24

0.14

0.05

210.

009

0.32

10.

033

4.87

0.82

0.10

960.

0096

0.5

1020

170

3490

3717

5015

066

956

38.2

NB3

14a_

136

4417

3.4

174.

80.

9997

003.

120.

083

0.02

723

0.00

068

0.05

820.

0012

0.66

60.

016

0.08

310.

0014

0.53

8443

754

313

524

4551

7.8

9.8

514.

48.

599.3

NB3

14a_

137

1160

302.

0040

000

4.68

0.38

0.03

880.

0053

0.08

0.00

540.

937

0.06

70.

0855

0.00

260.

577

010

011

8038

670

3552

915

79.0

%

con

±2σ2

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U±2σ2

±2σ2

Rho3

208 Pb

/2

32Th

±2σ2

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U

206 Pb

/

204 Pb

208 Pb

/ 20

6 Pb±2σ2

208 Pb

/ 23

2 Th±2σ2

Ana

lysis

Id

entif

ier

Pb

(ppm

)U

(p

pm)

Th

(ppm

)U

/Th

±2σ2

207 Pb

/2

06Pb

207 Pb

/ 20

6 Pb

Cal

cula

ted

age

s (M

a)Is

otop

ic ra

tios

Mea

sure

d co

ncen

trat

ions

1



Tabl

eA2.

Con

tinue

d.

NB3

14a_

138

5929

016

51.

7631

000

3.79

0.69

0.03

720.

0093

0.08

30.

036

0.88

0.36

0.07

820.

004

0.5

740

180

1040

540

620

160

485

2478.2

NB3

14a_

139

45.7

286

176

1.63

2000

05.

110.

260.

0292

0.00

130.

0589

0.00

180.

680.

021

0.08

40.

0014

0.28

9065

458

226

550

3952

612

519.

98.

498.8

NB3

14a_

140

94.2

506

347

1.46

8000

04.

350.

170.

0292

60.

0008

30.

0688

0.00

270.

788

0.03

60.

0828

0.00

250.

558

316

886

7658

920

513

1587.1

NB3

14a_

141

500

386

413

0.93

5900

2.93

0.38

0.12

950.

007

0.25

30.

017

15.0

50.

640.

443

0.03

20.

524

6012

031

8040

2814

4123

6015

083.9

NB3

14a_

142

51.9

373

210

1.78

3000

05.

860.

380.

0281

0.00

170.

0612

0.00

190.

707

0.02

40.

0843

0.00

220.

4907

848

559

3363

625

543

1452

213

96.1

NB3

14a_

143

104

9019

60.

4625

70.

807

0.05

0.11

30.

036

0.43

20.

037.

91.

50.

131

0.02

0.5

2090

610

4023

9421

3015

079

011

037.1

NB3

14a_

144

9416

726

70.

6362

01.

410.

130.

0431

0.00

270.

284

0.02

53.

920.

50.

0973

0.00

420.

585

152

3240

4115

7010

059

824

38.1

NB3

14a_

145

4023

012

51.

8416

000

4.32

0.29

0.03

210.

0028

0.06

480.

0044

0.66

0.06

40.

0743

0.00

460.

7183

748

638

5576

023

513

3846

228

90.1

NB3

14a_

146

310

990

786

1.26

980

2.26

0.12

0.04

320.

0021

0.15

910.

0087

1.72

0.12

0.07

770.

0016

0.5

855

4024

2694

1009

4548

2.1

9.5

47.8

NB3

14a_

147

72.5

295.

520

91.

4126

303.

360.

140.

038

0.00

110.

0996

0.00

381.

213

0.04

80.

0886

0.00

170.

575

422

1605

2480

522

547.

410

68.0

NB3

14a_

148

94.7

446

315.

71.

4123

003.

670.

120.

0325

0.00

120.

0724

0.00

270.

827

0.02

80.

0834

0.00

220.

564

524

973

7661

115

517

1384.6

NB3

14a_

149

38.2

314

8.6

148.

11.

0085

003.

136

0.08

70.

0280

40.

0007

20.

0589

0.00

140.

697

0.01

90.

0853

0.00

140.

5001

025

559

1454

925

536

1252

7.8

8.2

98.5

NB3

14a_

150

50.4

361.

819

1.6

1.89

2100

05.

750.

160.

0285

10.

0006

60.

0621

0.00

110.

727

0.02

0.08

480.

0017

0.76

6035

556

813

672

3755

412

524.

510

94.7

NB3

14a_

151

111.

764

145

71.

4015

000

4.11

50.

076

0.02

647

0.00

045

0.06

155

0.00

098

0.65

10.

016

0.07

670.

0013

0.76

5563

852

88.

965

226

508.

710

476.

37.

993.6

NB3

14a_

152

94.8

684

346.

21.

9833

000

5.62

0.13

0.02

969

0.00

067

0.06

176

0.00

082

0.7

0.01

40.

0823

0.00

150.

7625

137

591

1366

128

538.

68.

550

9.6

8.7

94.6

NB3

14a_

153

157.

796

164

01.

5029

000

4.39

70.

110.

0262

50.

0006

20.

0602

0.00

160.

609

0.01

90.

0734

50.

001

0.53

2445

752

412

601

5048

211

456.

96.

394.8

NB3

14a_

154

101.

679

729

7.1

2.68

6600

6.13

0.17

0.03

630.

0013

0.07

640.

0018

0.82

0.01

90.

0781

0.00

130.

572

125

1094

2760

7.5

1148

4.8

7.7

79.8

NB3

14a_

155

166

430

400

1.08

6000

02.

530.

490.

0394

0.00

960.

118

0.07

1.18

0.46

0.08

510.

0092

0.5

780

180

1350

700

750

170

526

5570.1

NB3

14a_

157

120

738

437

1.69

8000

4.29

0.2

0.03

010.

0018

0.07

460.

005

0.76

30.

068

0.07

370.

0017

0.5

600

3610

2028

570

3545

8.3

1080.4

NB3

14a_

158

24.2

158.

481

.61.

9493

005.

490.

250.

0328

0.00

210.

0693

0.00

360.

837

0.04

70.

0879

0.00

150.

565

141

860

110

613

2554

38.

988.6

NB3

14a_

159

2792

621.

4825

002.

470.

780.

048

0.01

10.

116

0.04

1.41

0.55

0.08

820.

0083

0.5

940

220

1770

2987

024

054

549

62.6

NB3

14a_

160

21.1

316

88.3

3.58

9800

11.2

50.

430.

0260

30.

0008

50.

0574

0.00

130.

634

0.01

70.

0804

0.00

170.

5759

9251

917

497

5049

8.1

1149

8.3

1010

0.0

NB3

14a_

161

82.7

406

288

1.41

9000

03.

830.

130.

0316

0.00

110.

0795

0.00

340.

926

0.04

50.

0853

0.00

170.

562

821

1169

3067

120

527.

710

78.6

NB3

14a_

162

39.3

262

161.

91.

6216

700

50.

160.

0265

70.

0007

40.

0583

0.00

140.

641

0.01

80.

0801

0.00

150.

5349

065

530

1552

753

502

1149

6.6

8.7

98.9

NB3

14a_

163

66.1

313

282

1.11

1070

03.

564

0.07

90.

0254

30.

0005

40.

0588

0.00

110.

650.

013

0.08

013

0.00

120.

4579

106

507.

611

558

3150

8.1

8.2

496.

97

97.8

NB3

14a_

164

7.1

6524

2.71

3600

07.

550.

560.

0282

0.00

210.

0728

0.00

950.

740.

093

0.07

430.

0024

0.5

563

4110

0026

562

5546

214

82.2

NB3

14a_

165

61.5

304

197.

11.

5433

003.

740.

20.

0343

0.00

210.

0758

0.00

260.

873

0.04

0.08

420.

0035

0.5

682

4110

8368

637

2252

121

81.8

NB3

14a_

166

127

600

590

1.02

9000

04.

380.

930.

0266

0.00

220.

065

0.01

70.

646

0.07

0.07

370.

0068

2.40

7898

953

143

910

3250

440

458

4190.9

NB3

14a_

167

69.4

245

244.

11.

0070

000

2.72

0.27

0.03

120.

003

0.06

570.

0021

0.77

80.

050.

0866

0.00

670.

9145

187

620

5979

665

584

2853

540

91.6

NB3

14a_

168

272.

656

240

91.

3713

600

4.8

0.34

0.07

610.

0058

0.11

460.

0036

4.11

0.15

0.26

170.

0057

0.51

5505

514

8011

018

6633

1655

2914

9829

90.5

NB3

14a_

169

176

558

731

0.76

2300

02.

459

0.06

30.

0265

10.

0005

40.

0628

10.

0009

0.71

10.

018

0.08

190.

0016

0.82

6212

452

8.8

1170

232

544.

910

507.

49.

393.1

NB3

14a_

170

164

172

520

0.33

242

0.91

20.

10.

0532

0.00

90.

439

0.03

37.

150.

950.

1165

0.00

880.

510

4017

040

0034

2100

130

708

5033.7

NB3

14a_

171

157.

945

024

81.

8177

12.

322

0.08

80.

0707

0.00

270.

1657

0.00

732.

020.

130.

0887

0.00

280.

513

7950

2497

6411

1339

547

1649.1

NB3

14a_

172

33.2

157

119

1.32

9200

4.11

0.49

0.03

140.

0027

0.08

60.

021

0.25

0.08

340.

0026

0.5

624

5310

7035

670

100

516

1577.0

NB3

14a_

173

166

8516

60.

5114

20.

597

0.05

70.

124

0.04

40.

650.

044

19.6

5.9

0.21

90.

056

0.5

2330

760

4620

100

3020

240

1260

280

47.7

NB3

14a_

174

333

1140

702

1.62

963

2.49

80.

083

0.05

50.

0025

0.14

530.

005

1.64

30.

088

0.08

230.

002

0.5

1080

4822

8036

990

3650

912

51.4

NB3

14a_

175

63.7

162.

417

0.8

0.95

2940

2.19

70.

073

0.04

060.

0012

0.12

690.

0032

1.62

30.

051

0.09

30.

0015

0.5

805

2320

5046

978

2057

3.1

8.8

58.6

NB3

14a_

176

149

883

231

3.82

3600

011

.31.

80.

0698

0.00

250.

0897

0.00

322.

450.

230.

197

0.01

50.

9329

813

6448

1411

6912

4473

1157

7993.0

NB3

14a_

177

64.5

376

253

1.49

1100

04.

530.

160.

0277

70.

0008

20.

0612

0.00

220.

713

0.02

60.

0849

0.00

20.

3448

343

554

1663

437

546

1552

512

96.2

±2σ2

206 Pb

/ 23

8 U±2σ2

%

con

208 Pb

/2

32Th

±2σ2

207 Pb

/2

06Pb

±2σ2

207 Pb

/ 23

5 U

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U±2σ2

Rho3

Mea

sure

d co

ncen

trat

ions

1Is

otop

ic ra

tios

Cal

cula

ted

age

s (M

a)

Ana

lysis

Id

entif

ier

Pb

(ppm

)U

(p

pm)

Th

(ppm

)U

/Th

206 Pb

/

204 Pb

208 Pb

/ 20

6 Pb±2σ2

208 Pb

/ 23

2 Th±2σ2

207 Pb

/ 20

6 Pb±2σ2



Tabl

eA2.

Con

tinue

d.

NB3

14a_

178

357

1770

1230

1.44

3600

03.

790.

520.

0313

0.00

510.

084

0.02

60.

750.

170.

0747

0.00

180.

562

299

1040

400

610

140

472

1877.4

NB3

14a_

179

171

674

463

1.46

1370

2.88

70.

10.

0413

0.00

210.

1106

0.00

381.

254

0.07

60.

0824

0.00

30.

581

940

1801

3882

234

510

1862.0

NB3

14a_

180

32.8

177.

713

1.6

1.35

1280

04.

590.

150.

0269

80.

0005

30.

0584

0.00

110.

686

0.01

40.

0856

30.

0012

0.45

1228

653

8.1

1053

341

529.

98.

452

9.6

6.9

99.9

NB3

14a_

181

56.8

203

208

0.98

6700

2.76

0.29

0.02

950.

002

0.07

150.

009

0.85

0.11

0.08

790.

0034

0.5

587

3991

039

619

5354

320

87.7

NB3

14a_

182

133.

983

551

6.4

1.62

8000

04.

510.

120.

0278

80.

0009

40.

0654

0.00

170.

660.

018

0.07

360.

0013

0.5

556

1978

155

514

1145

7.7

8.1

89.0

NB3

14a_

183

87.1

387.

536

8.5

1.05

1200

03.

374

0.09

50.

0258

30.

0006

70.

0598

0.00

170.

671

0.02

10.

0817

0.00

140.

4334

907

515

1358

440

521

1250

6.5

8.1

97.2

NB3

14a_

184

116

147

292

0.50

392

1.14

70.

047

0.04

50.

0026

0.26

90.

017

3.78

0.3

0.10

120.

0033

0.5

888

5132

7011

015

7369

621

1939.5

NB3

14a_

185

156.

710

4866

41.

5819

000

4.39

0.12

0.02

587

0.00

081

0.06

360.

0014

0.63

20.

017

0.07

250.

0014

0.58

8996

651

616

722

4149

7.2

1145

18.

690.7

NB3

14a_

186

50.4

306.

418

2.1

1.68

1030

04.

520.

420.

0303

0.00

270.

079

0.00

430.

889

0.04

60.

0822

0.00

150.

560

453

1170

2764

525

509

8.8

78.9

NB3

14a_

187

115

400

430

0.93

1400

02.

950.

170.

0262

10.

001

0.06

750.

0048

0.73

40.

060.

0795

0.00

430.

552

320

830

140

557

3449

326

88.5

NB3

14a_

188

6228

018

61.

5141

004.

44.

40.

033

0.03

30.

073

0.07

30.

810.

810.

080.

080.

565

065

010

0042

600

600

500

500

83.3

NB3

14a_

189

23.9

95.3

96.2

0.99

5400

3.12

0.14

0.02

711

0.00

091

0.06

270.

003

0.72

70.

034

0.08

460.

0022

0.23

6036

254

118

670

2455

420

523

1394.4

NB3

14a_

190

84.8

534

353.

21.

5114

000

4.81

0.12

0.02

608

0.00

062

0.06

060.

0011

0.66

60.

016

0.07

950.

0014

0.65

9213

452

012

614

3951

7.7

1049

3.1

8.2

95.2

NB3

14a_

191

65.8

484

278.

81.

7421

000

5.35

0.19

0.02

544

0.00

071

0.05

950.

0019

0.63

90.

022

0.07

880.

0019

0.44

9934

508

1457

225

504

1548

911

97.0

NB3

14a_

192

3921

5.1

160

1.34

1440

04.

380.

120.

0265

20.

0005

60.

0584

0.00

120.

663

0.01

40.

0825

60.

0013

0.40

8444

952

911

532

4751

6.3

8.8

511.

47.

699.1

NB3

14a_

193

247

175

460

0.38

240

0.61

90.

054

0.05

930.

0041

0.61

0.04

910

.65

10.

1232

0.00

920.

511

6479

4490

2624

6015

074

853

30.4

NB3

14a_

194

223.

913

3610

271.

3037

000

3.93

70.

10.

0238

40.

0005

50.

0598

0.00

140.

593

0.01

50.

0721

0.00

120.

4379

545

476

1159

150

472.

49.

844

8.8

7.5

95.0

NB3

14a_

195

44.3

162.

417

0.3

0.95

8400

3.13

70.

084

0.02

804

0.00

055

0.06

090.

0019

0.73

40.

023

0.08

737

0.00

130.

2465

725

558.

811

595

2755

411

539.

97.

597.5

NB3

14a_

196

69.7

379

265.

71.

4336

000

4.2

0.19

0.02

842

0.00

086

0.06

190.

0017

0.72

30.

028

0.08

510.

0026

0.70

9512

756

617

664

5755

217

526

1595.3

NB3

14a_

197

252.

879

855

2.7

1.44

2730

2.47

50.

058

0.04

910.

0012

0.13

280.

0033

1.44

10.

041

0.07

872

0.00

120.

596

823

2129

4390

919

488.

47.

153.7

NB3

14a_

198

1200

1260

286

4.41

303

1.5

0.15

0.48

40.

065

0.34

30.

018

7.21

0.54

0.15

80.

011

0.5

7720

860

3636

2821

3148

942

5944.2

NB3

14a_

199

34.1

243

122.

31.

9924

005.

460.

540.

0306

0.00

240.

0827

0.00

670.

932

0.07

0.08

250.

0022

0.5

609

4712

3015

066

636

511

1376.7

NB3

14a_

200

208

400

301

1.33

384

1.53

0.08

10.

0754

0.00

20.

257

0.01

53.

640.

310.

0996

0.00

260.

514

6938

3189

2915

2160

611

1540.2

NB3

14a_

201

62.8

216

243

0.89

1200

02.

740.

170.

0285

0.00

130.

0664

0.00

270.

795

0.03

20.

0876

0.00

230.

3104

085

568

2681

080

593

1854

114

91.2

NB3

14a_

202

56.5

305

242

1.26

2300

04.

184

0.11

0.02

540.

0005

40.

0580

40.

0009

50.

6328

0.01

20.

0793

90.

0011

0.53

9820

650

6.8

1152

130

498.

38

492.

56.

598.2

NB3

14a_

203

154

295

225.

61.

3117

000

4.36

0.32

0.07

50.

005

0.09

770.

0058

3.44

0.23

0.25

720.

0074

0.46

1062

714

6195

1580

110

1512

5414

7538

97.6

NB3

14a_

204

176

402

436

0.92

1360

2.20

40.

091

0.04

346

0.00

10.

1288

0.00

651.

70.

096

0.09

530.

0016

0.5

860

2020

1831

994

3458

6.7

9.3

59.0

NB3

14a_

205

284

748

744

1.01

520

1.81

70.

068

0.04

10.

0028

0.19

370.

0077

2.07

80.

10.

078

0.00

240.

581

354

2767

6411

3933

484

1442.5

NB3

14a_

206

5034

019

71.

7319

000

5.25

0.14

0.02

801

0.00

098

0.06

430.

0019

0.73

90.

025

0.08

320.

0015

0.48

8871

558

1973

932

561

1551

5.3

991.9

NB3

14a_

207

124.

987

846

71.

8836

000

50.

210.

0289

0.00

088

0.06

440.

002

0.66

40.

019

0.07

610.

0016

0.24

6308

757

617

758

6951

612

472.

69.

991.6

NB3

14a_

208

7959

031

01.

9038

000

5.24

0.39

0.02

720.

0017

0.06

230.

0025

0.62

80.

031

0.07

340.

002

0.58

3205

854

334

675

2849

419

457

1292.5

NB3

14a_

209

68.4

311

231

1.35

5400

3.55

50.

094

0.03

230.

0012

0.07

640.

0025

0.88

70.

034

0.08

460.

0016

0.5

643

2310

9433

644

1852

3.7

9.5

81.3

Prim

ary

refe

renc

e m

ater

ial5

9150

0 (n

=32)

15.0

480

.26

30.0

32.

6710

150

9.36

550.

294

0.05

420.

0016

10.

0748

80.

0013

1.85

380.

0381

0.17

962

0.00

246

0.54

9707

810

62.7

6.5

1052

.26.

110

63.3

2.9

1065

.62.

9

Seco

ndar

y re

fere

nce

mat

eria

l(s)5

R33

(n=1

0)43

.15

258.

4821

2.72

1.22

8741

.666

667

4.70

780.

177

0.02

198

0.00

072

0.05

786

0.00

170.

5362

0.01

890.

0671

50.

0011

80.

5580

4342

2.6

3.1

406.

014

.041

7.3

2.6

418.

21.

9

%

con

±2σ2

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U±2σ2

±2σ2

Rho3

208 Pb

/2

32Th

207 Pb

/ 20

6 Pb±2σ2

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U

206 Pb

/

204 Pb

208 Pb

/ 20

6 Pb±2σ2

208 Pb

/ 23

2 Th±2σ2

Ana

lysis

Id

entif

ier

Pb

(ppm

)U

(p

pm)

Th

(ppm

)U

/Th

Mea

sure

d co

ncen

trat

ions

1Is

otop

ic ra

tios

Cal

cula

ted

age

s (M

a)

±2σ2

207 Pb

/2

06Pb



Tabl

eA2.

Con

tinue

d.

NB1

2-31

5 Bu

ckm

ans C

reek

(UTM

- 6

7889

4E, 4

9942

91N

; Gri

d Zo

ne 1

9T)

NB3

15a_

0175

.336

330

61.

1921

000

2.92

0.25

0.02

570.

0011

0.06

410.

0014

0.79

30.

016

0.09

270.

0013

0.22

3951

351

321

730

4659

1.9

8.8

571.

27.

696

.5N

B315

a_02

67.2

240.

985

.82.

8159

000

6.67

0.49

0.08

460.

0035

0.12

160.

0023

5.06

40.

096

0.30

950.

0049

0.42

0273

616

4165

1976

3318

2916

1738

2495

.0N

B315

a_03

3732

013

82.

3223

300

4.66

0.36

0.02

880.

0014

0.06

730.

0019

0.82

80.

020.

0925

0.00

140.

0211

745

574

2882

559

613

1257

0.1

8.1

93.0

NB3

15a_

0418

581

223

2.1

3.50

2050

007.

710.

540.

0879

0.00

350.

1229

0.00

144.

987

0.07

60.

3027

0.00

340.

6678

714

1703

6519

9720

1816

1317

0417

93.8

NB3

15a_

0518

.821

778

.32.

7712

300

5.99

0.46

0.02

592

0.00

120.

0616

0.00

190.

745

0.02

10.

0901

0.00

120.

0274

095

517

2463

166

564

1255

6.1

798

.6N

B315

a_06

53.3

135.

637

.93.

5838

000

9.1

0.66

0.15

550.

0065

0.23

930.

0029

19.9

10.

250.

6202

0.00

890.

6014

034

2919

110

3112

2030

8612

3109

3510

0.7

NB3

15a_

0716

.468

.371

0.96

3000

2.27

0.18

0.02

576

0.00

130.

0647

0.00

30.

774

0.03

30.

0892

0.00

190.

0669

106

514

2670

010

058

218

550

1194

.5N

B315

a_08

62.5

109

55.4

1.97

3400

05.

450.

390.

1297

0.00

540.

1737

0.00

2611

.98

0.16

0.50

870.

0072

0.40

9055

624

6496

2588

2526

0212

2650

3110

1.8

NB3

15a_

0959

.441

326

71.

5513

800

3.99

70.

290.

0253

0.00

10.

0596

0.00

130.

703

0.01

50.

0870

20.

0009

10.

1991

273

505

2158

249

539.

69.

153

7.8

5.4

99.7

NB3

15a_

1069

.634

2.2

310

1.10

1690

03.

165

0.23

0.02

581

0.00

110.

0602

0.00

140.

727

0.01

70.

0885

0.00

120.

2993

411

515

2159

452

554

1054

6.8

7.2

98.7

NB3

15a_

1122

851

933

51.

5569

000

5.92

0.42

0.08

130.

0033

0.10

690.

0012

4.62

70.

070.

312

0.00

430.

7021

688

1580

6117

4520

1753

1217

5021

99.8

NB3

15a_

1251

.323

121

11.

0976

003.

270.

250.

0291

10.

0013

0.06

270.

002

0.78

50.

022

0.09

120.

0014

0.00

4182

958

025

678

6959

013

562.

68.

595

.4N

B315

a_13

386

414

310

1.34

7400

04.

489

0.32

0.15

380.

0058

0.18

660.

0016

14.2

0.13

0.54

830.

0057

0.62

1833

2891

100

2710

1427

62.3

8.6

2817

2410

2.0

NB3

15a_

1418

.311

1.8

81.3

1.38

3600

4.07

0.32

0.02

810.

0014

0.05

690.

0016

0.69

80.

022

0.08

770.

0011

0.45

5363

560

2847

565

536

1354

1.8

6.6

101.

1N

B315

a_15

86.6

1081

375

2.88

2900

08.

560.

610.

0284

40.

0011

0.05

762

0.00

079

0.75

80.

013

0.09

510.

0015

0.65

6057

567

2250

830

572.

57.

358

5.8

8.6

102.

3N

B315

a_16

202

247.

919

5.4

1.27

124

1.07

40.

10.

1202

0.00

970.

299

0.01

55.

130.

290.

1245

0.00

360.

4634

2322

9018

034

4983

1834

5175

621

41.2

NB3

15a_

1720

134.

986

.41.

5651

004.

230.

330.

0274

0.00

140.

0586

0.00

190.

701

0.02

30.

0866

0.00

140.

2701

615

546

2751

970

537

1453

5.5

899

.7N

B315

a_19

17.5

157

66.3

2.37

5300

6.73

0.53

0.02

990.

0014

0.05

960.

0019

0.77

50.

023

0.09

460.

0014

0.09

5037

659

528

559

6758

113

582.

48.

110

0.2

NB3

15a_

2048

.820

2.7

191.

71.

0691

003.

290.

250.

0280

30.

0012

0.05

850.

0014

0.72

10.

018

0.08

950.

0012

0.34

4029

755

923

538

5255

011

552.

67.

210

0.5

NB3

15a_

2116

.29

41.6

43.6

0.95

1110

05.

270.

430.

0316

0.00

170.

0598

0.00

220.

793

0.02

70.

0945

0.00

190.

1534

212

628

3458

681

591

1558

211

98.5

NB3

15a_

2217

.534

.843

.80.

7969

004.

530.

450.

0313

0.00

310.

0652

0.00

730.

850.

110.

0923

0.00

210.

8031

105

622

6065

017

059

442

569

1395

.8N

B315

a_23

188.

837

121

6.4

1.71

2030

0010

.29

0.72

0.07

340.

0028

0.08

611

0.00

085

2.75

10.

040.

2282

0.00

290.

7454

191

1432

5313

3819

1341

1113

2515

98.8

NB3

15a_

2425

.389

.169

1.29

6900

7.52

0.57

0.03

031

0.00

140.

0583

0.00

120.

754

0.01

50.

0924

0.00

130.

3037

6660

328

532

4957

1.3

8.5

569.

87.

899

.7N

B315

a_26

86.3

92.2

230

0.40

1420

02.

469

0.18

0.03

153

0.00

120.

0594

0.00

20.

776

0.02

40.

0932

0.00

160.

1107

2562

724

563

7458

214

574.

29.

298

.7N

B315

a_27

127.

620

610

5.3

1.96

1430

0011

.70.

840.

0965

0.00

390.

1166

0.00

165.

031

0.08

70.

3104

0.00

430.

6316

865

1862

7219

0124

1823

1517

4221

95.6

NB3

15a_

2849

.455

.248

.94

1.13

2800

07.

61.

20.

0841

0.00

420.

1114

0.00

44.

020.

170.

2571

0.00

830.

5644

697

1631

7918

1066

1627

3714

7243

90.5

NB3

15a_

2941

.971

.812

30.

5812

800

3.72

0.28

0.02

814

0.00

130.

0594

0.00

140.

742

0.01

50.

0892

0.00

10.

0466

522

561

2557

649

562.

89.

155

0.7

5.9

97.9

NB3

15a_

3084

.910

4.9

74.4

1.41

9200

09.

380.

720.

0966

0.00

410.

1075

0.00

144.

677

0.07

10.

3119

0.00

380.

5657

753

1863

7617

5425

1762

1317

5019

99.3

NB3

15b_

0118

0.3

301

224.

81.

3412

600

4.87

50.

150.

0871

70.

0008

70.

1069

90.

0015

4.49

10.

053

0.30

370.

0039

0.35

5064

816

8916

1749

2717

28.6

9.7

1709

1998

.9N

B315

b_03

11.7

973

44.5

1.64

1790

5.68

0.29

0.02

930.

0011

0.05

790.

0017

0.72

30.

022

0.09

090.

0015

0.33

4725

558

421

502

6755

312

560.

68.

610

1.4

NB3

15b_

0433

1.2

1110

394

2.82

6000

06.

370.

360.

0924

0.00

30.

1025

0.00

242.

910.

120.

2056

0.00

560.

8431

913

1785

5616

6243

1379

3012

0530

87.4

NB3

15b_

0528

.914

5.4

96.4

1.51

2200

4.83

0.21

0.03

020.

0012

0.06

550.

0028

0.8

0.03

80.

0885

0.00

140.

4518

8160

123

756

7259

318

546.

98

92.2

NB3

15b_

0612

7.9

181

144.

81.

2513

700

4.48

50.

140.

0973

0.00

150.

1194

0.00

195.

446

0.1

0.33

050.

0061

0.62

6429

618

7629

1944

2818

9016

1840

3097

.4N

B315

b_07

58.5

308

222.

51.

3810

300

4.67

0.19

0.02

872

0.00

051

0.05

980.

0012

0.76

0.01

40.

0924

50.

0013

0.25

9400

557

210

585

4657

4.8

8.6

569.

97.

599

.1N

B315

b_09

18.7

794

.279

.41.

1930

004.

070.

180.

0261

20.

0008

60.

0578

0.00

170.

668

0.01

80.

0839

0.00

140.

1551

042

521

1750

067

518

1151

9.1

8.2

100.

2N

B315

b_10

29.9

234

112.

82.

0751

006.

980.

560.

0289

0.00

078

0.05

880.

0013

0.75

40.

015

0.09

310.

0017

0.33

0879

657

615

549

4857

0.1

8.6

573.

79.

910

0.6

NB3

15b_

1156

.919

322

00.

8892

003.

013

0.11

0.02

789

0.00

054

0.05

790.

0014

0.72

10.

018

0.09

060.

0015

0.37

8295

655

611

512

5255

011

559

8.9

101

.6N

B315

b_12

237

129.

917

90.

7326

000

2.73

80.

087

0.14

320.

0018

0.18

830.

0028

13.6

10.

190.

5256

0.00

710.

4142

8627

0532

2725

2427

2213

2722

3010

0.0

±2σ2

206 Pb

/ 23

8 U±2σ2

%

con

208 Pb

/2

32Th

±2σ2

207 Pb

/2

06Pb

±2σ2

207 Pb

/ 23

5 U

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U±2σ2

Rho3

Mea

sure

d co

ncen

trat

ions

1Is

otop

ic ra

tios

Cal

cula

ted

age

s (M

a)

Ana

lysis

Id

entif

ier

Pb

(ppm

)U

(p

pm)

Th

(ppm

)U

/Th

206 Pb

/

204 Pb

208 Pb

/ 20

6 Pb±2σ2

208 Pb

/ 23

2 Th±2σ2

207 Pb

/ 20

6 Pb±2σ2



Tabl

eA2.

Con

tinue

d.

NB3

15b_

1348

.228

419

81.

4377

004.

870.

170.

0260

60.

0005

20.

0580

70.

0012

0.69

20.

013

0.08

640.

0013

0.26

9366

552

010

535

4053

3.7

7.6

534.

38

NB3

15b_

1423

8.3

315.

725

6.8

1.23

7900

04.

431

0.16

0.09

980.

0015

0.11

930.

0017

5.67

80.

077

0.34

470.

0052

0.50

9396

819

2228

1944

2619

2912

1909

2599

.0N

B315

b_15

70.5

184.

582

2.25

3600

08.

050.

270.

0918

0.00

160.

1127

0.00

174.

939

0.06

40.

318

0.00

430.

3516

189

1774

2918

4127

1808

.111

1780

2198

.4N

B315

b_16

49.9

64.4

34.3

1.88

2700

07.

170.

340.

153

0.00

530.

2191

0.00

6117

.29

0.71

0.57

10.

014

0.75

1016

628

7593

2966

4529

4240

2908

5798

.8N

B315

b_17

22.2

71.8

82.6

0.87

6500

2.85

20.

120.

0286

50.

0008

0.06

0.00

210.

752

0.02

40.

091

0.00

150.

0620

324

571

1658

373

567

1456

1.3

8.9

99.0

NB3

15b_

1850

.220

3.7

78.2

2.60

1270

009.

320.

340.

0686

0.00

150.

0864

0.00

142.

826

0.04

20.

237

0.00

340.

3848

936

1340

2813

4232

1361

.411

1371

1810

0.7

NB3

15b_

1937

.618

414

8.5

1.24

9000

004.

120.

150.

0270

30.

0006

20.

0592

0.00

140.

716

0.01

40.

0879

70.

0012

0.01

7136

353

912

561

5054

7.8

8.1

543.

57.

399

.2N

B315

b_20

44.9

268.

881

3.32

7800

012

.82.

30.

0609

0.00

180.

0752

0.00

171.

710.

10.

1627

0.00

760.

9318

062

1195

3410

6246

997

3996

942

97.2

NB3

15b_

2120

5.6

977

464

2.11

3400

08.

370.

280.

0502

0.00

130.

084

0.00

162.

154

0.06

0.18

560.

0045

0.74

1042

989

2412

8537

1163

1910

9724

94.3

NB3

15b_

2214

0.2

361

568

0.64

6800

2.14

40.

069

0.02

736

0.00

037

0.05

809

0.00

120.

701

0.01

20.

0872

80.

0012

0.11

7553

154

5.6

7.2

524

4453

97.

153

9.4

7.2

100.

1N

B315

b_24

17.5

212

1.9

71.7

1.70

3600

5.97

0.24

0.02

661

0.00

079

0.05

860.

0016

0.71

60.

018

0.08

810.

0014

0.17

4010

453

115

540

6354

711

544.

18.

499

.5N

B315

b_25

136.

777

212

3.9

6.23

7000

024

.27

0.78

0.11

980.

0018

0.16

290.

0023

10.0

570.

120.

4463

0.00

540.

3096

923

2286

3324

8424

2440

.811

2381

2597

.5N

B315

b_26

31.8

128.

512

0.3

1.07

2000

3.56

0.16

0.02

860.

0011

0.06

570.

0037

0.80

60.

043

0.09

050.

0015

0.02

863

570

2173

392

595

2255

8.3

9.1

93.8

NB3

15b_

2825

4.4

697

274.

22.

5427

000

9.46

0.4

0.09

870.

0012

0.12

127

0.00

176.

067

0.08

10.

3628

0.00

540.

5114

642

1902

2119

7325

1986

1219

9525

100.

5N

B315

b_29

8.26

4212

.33.

4120

409.

810.

650.

0743

0.00

680.

0862

0.00

332.

211

0.08

90.

1882

0.00

390.

3501

519

1440

120

1324

7611

7827

1111

2194

.3N

B315

b_30

156.

130

622

1.4

1.38

2900

04.

920.

170.

074

0.00

120.

0938

50.

0014

3.42

10.

042

0.26

390.

0033

0.27

5421

214

4721

1502

2815

08.7

9.5

1510

1710

0.1

NB3

15c_

0131

.88

127.

942

.79

2.99

2600

010

.61

0.35

0.08

060.

0015

0.09

139

0.00

113.

590.

089

0.27

670.

0054

0.87

9041

115

6627

1451

2415

4620

1574

.527

101.

8N

B315

c_02

133.

428

518

4.4

1.55

1100

03.

991

0.14

0.07

860.

0019

0.08

30.

0016

2.35

20.

091

0.19

830.

0056

0.87

9923

915

2835

1267

3812

2627

1166

3095

.1N

B315

c_03

136.

717

3.2

136.

81.

2737

000

4.11

50.

140.

1084

0.00

170.

1133

0.00

185.

550.

150.

3314

0.00

70.

8094

742

2080

3218

5229

1910

2518

4534

97.6

NB3

15c_

0448

.513

0.6

56.1

2.33

2700

08.

090.

270.

0932

0.00

180.

1038

0.00

145.

030.

160.

3159

0.00

640.

9623

553

1800

3316

8925

1817

2817

7031

97.4

NB3

15c_

0518

8.7

900

190.

14.

7319

0000

16.6

80.

630.

1062

0.00

190.

1287

0.00

227.

070.

170.

3721

0.01

20.

8549

881

2041

3620

7830

2118

2220

5148

96.8

NB3

15c_

0633

0.6

902

471.

81.

9117

0000

6.94

60.

20.

0759

40.

0008

40.

0904

0.00

089

3.37

50.

038

0.26

30.

0053

0.96

0677

914

7916

1432

1914

97.7

8.7

1505

2710

0.5

NB3

15c_

0757

.121

8.5

219.

41.

0022

000

3.22

10.

120.

0279

90.

0005

20.

0575

0.00

130.

731

0.02

0.08

519

0.00

180.

5914

716

558

1049

550

556

1252

711

94.8

NB3

15c_

0871

.269

.950

.11.

4066

000

5.31

10.

160.

153

0.00

250.

1941

0.00

2416

.15

0.53

0.55

20.

011

1.01

0137

928

7744

2777

1928

7932

2833

4698

.4N

B315

c_09

48.1

216.

716

01.

3515

000

4.76

0.22

0.03

276

0.00

065

0.05

846

0.00

110.

902

0.02

40.

1034

0.00

220.

7123

977

651

1353

540

651

1263

4.2

1397

.4N

B315

c_10

54.1

236

95.3

2.48

8500

08.

520.

260.

061

0.00

092

0.07

753

0.00

096

2.25

40.

039

0.20

050.

004

0.78

8069

511

9718

1134

2411

9612

1177

.621

98.5

NB3

15c_

1147

.948

.713

1.6

0.37

7000

1.27

90.

061

0.03

901

0.00

066

0.07

210.

0021

1.28

40.

055

0.13

090.

0031

0.76

2668

773

1397

158

836

2579

318

94.9

NB3

15c_

1242

.923

015

81.

4642

000

4.56

0.18

0.02

893

0.00

058

0.06

750.

002

0.81

40.

028

0.09

060.

002

0.52

1913

457

611

830

5560

215

559.

212

92.9

NB3

15c_

1374

218

752.

9118

0000

12.5

30.

750.

1135

0.00

280.

1311

0.00

157.

030.

180.

4083

0.00

970.

8951

994

2171

5021

1020

2109

2322

0644

104.

6N

B315

c_14

31.5

727

40.4

18.0

016

0000

66.4

2.7

0.08

390.

0026

0.09

617

0.00

123.

566

0.07

30.

2887

0.00

640.

8316

286

1628

4915

4924

1541

1616

3532

106.

1N

B315

c_15

27.9

129.

811

3.4

1.14

3200

03.

947

0.14

0.02

643

0.00

058

0.06

070.

0012

0.72

50.

021

0.08

794

0.00

180.

7312

881

527

1162

146

551

1354

3.3

1198.6

NB3

15c_

1622

.410

4.3

87.9

1.19

1300

04.

110.

150.

0272

80.

0006

20.

0608

0.00

160.

732

0.02

70.

0911

0.00

210.

7052

968

544

1260

857

555

1556

212

101.

3N

B315

c_17

19.8

92.3

73.1

1.26

1900

04.

250.

180.

0291

30.

0008

40.

0627

0.00

180.

802

0.03

10.

0924

0.00

210.

6752

841

580

1668

060

594

1756

9.8

1295.9

NB3

15c_

1860

205.

184

.22.

4411

5000

6.63

0.3

0.07

690.

0022

0.09

730.

0017

2.45

30.

083

0.18

750.

0045

0.87

1616

314

9640

1568

3212

6026

1107

2487.9

NB3

15c_

1920

.17

127.

371

.81.

7714

000

5.93

0.25

0.03

005

0.00

082

0.06

080.

0013

0.78

0.02

0.09

461

0.00

20.

5969

758

601

1561

845

584

1258

2.7

1299.8

NB3

15c_

2026

440

6.8

308

1.32

1600

004.

820.

230.

0921

0.00

120.

1197

0.00

145.

069

0.08

10.

3125

0.00

620.

8077

635

1784

2419

4921

1829

1317

5331

95.8

NB3

15c_

2139

.721

6.6

89.9

2.41

1600

06.

870.

40.

048

0.00

130.

063

0.00

141.

095

0.03

50.

1185

0.00

290.

7202

137

948

2570

046

749

1772

217

96.4

NB3

15c_

2219

.66

98.7

78.8

1.25

5000

04.

260.

210.

0270

50.

0009

70.

0574

0.00

170.

701

0.02

90.

0838

0.00

190.

7187

582

539

1949

063

537

1751

8.5

1196.6

NB3

15c_

2331

.877

.143

.21.

7862

000

6.04

0.24

0.07

830.

0015

0.08

780.

0015

3.34

0.11

0.26

170.

0056

0.88

7332

615

2827

1371

3314

8626

1498

2910

0.8

%

con

±2σ2

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U±2σ2

±2σ2

Rho3

208 Pb

/2

32Th

207 Pb

/ 20

6 Pb±2σ2

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U

206 Pb

/

204 Pb

208 Pb

/ 20

6 Pb±2σ2

208 Pb

/ 23

2 Th±2σ2

Ana

lysis

Id

entif

ier

Pb

(ppm

)U

(p

pm)

Th

(ppm

)U

/Th

Mea

sure

d co

ncen

trat

ions

1Is

otop

ic ra

tios

Cal

cula

ted

age

s (M

a)

±2σ2

207 Pb

/2

06Pb

100.

1



Tabl

eA2.

Con

tinue

d.

NB3

15c_

2432

.913

4.8

132.

21.

0241

000

3.50

80.

110.

0266

40.

0005

0.05

510.

0012

0.74

10.

023

0.08

830.

0019

0.71

2790

853

1.4

9.9

398

4856

113

545.

711

97.3

NB3

15c_

2530

.516

0.1

116.

91.

3742

000

4.66

0.16

0.02

796

0.00

055

0.05

550.

0011

0.74

0.02

10.

0906

40.

0019

0.71

6052

355

711

418

4656

112

559.

311

99.7

NB3

15c_

2620

.07

123.

277

1.60

4800

04.

990.

20.

0278

10.

0008

80.

0562

0.00

190.

737

0.03

70.

0865

0.00

230.

7807

494

554

1744

473

558

2153

4.5

1495.8

NB3

15c_

2739

.115

214

01.

0919

000

3.9

0.2

0.03

097

0.00

098

0.05

540.

0014

0.79

60.

029

0.09

530.

0023

0.72

2851

461

619

415

5759

316

587

1499.0

NB3

15c_

2810

0.4

424

389

1.09

4200

03.

744

0.11

0.02

788

0.00

045

0.05

468

0.00

085

0.72

70.

013

0.09

122

0.00

190.

6872

612

555.

78.

839

135

554.

17.

856

2.7

1110

1.6

NB3

15c_

2930

.711

5.9

121.

30.

9648

000

3.41

0.14

0.02

714

0.00

050.

0539

0.00

140.

738

0.02

30.

0895

20.

0019

0.56

4732

154

1.3

9.9

347

5655

914

552.

611

98.9

NB3

15c_

3012

.666

.541

.21.

6141

000

5.3

0.26

0.03

270.

0013

0.06

580.

002

0.98

10.

050.

0988

0.00

220.

9558

975

649

2678

862

689

2560

7.5

1388.2

NB3

15d_

0127

.922

210

7.8

2.06

3200

05.

950.

150.

0276

20.

0016

0.06

527

0.00

170.

740.

019

0.09

080.

0026

0.54

4602

555

0.6

3178

053

561.

811

560.

215

99.7

NB3

15d_

0218

1.8

283

142.

31.

9923

0000

6.46

40.

130.

1363

0.00

760.

1927

0.00

4412

0.29

0.49

930.

014

0.62

6360

225

8214

027

6438

2604

2226

1060

100.

2N

B315

d_03

89.8

1352

222

6.09

3300

0018

.91.

20.

0434

60.

0025

0.07

336

0.00

171.

238

0.03

0.13

450.

0038

0.61

9621

486

048

1023

4981

7.3

1481

3.3

2299.5

NB3

15d_

0412

9.5

422

509

0.83

9200

02.

597

0.08

30.

0272

50.

0015

0.06

425

0.00

160.

715

0.02

0.08

880.

0026

0.62

2444

454

3.4

3074

453

546.

812

548.

215

100.

3N

B315

d_05

56.8

276

207.

81.

3348

000

3.94

90.

097

0.02

901

0.00

170.

0658

40.

0017

0.75

50.

020.

0906

0.00

260.

5647

148

578

3379

955

570.

812

558.

916

97.9

NB3

15d_

0619

3.2

733

246

2.98

1390

009.

570.

230.

0848

0.00

480.

1063

40.

0025

3.64

10.

096

0.26

920.

0076

0.63

1086

416

4590

1735

4315

6020

1537

3898.5

NB3

15d_

0784

.411

0.4

77.5

1.42

6400

04.

892

0.1

0.11

410.

0064

0.14

210.

0034

7.18

30.

180.

3942

0.01

10.

5964

373

2183

120

2249

4121

3521

2141

5210

0.3

NB3

15d_

0839

341.

554

.66.

2513

0000

12.9

50.

440.

0777

0.00

450.

0801

80.

002

1.57

90.

044

0.15

140.

0044

0.61

6733

915

1384

1203

4696

117

909

2594.6

NB3

15d_

0931

.312

6.1

122.

61.

0334

000

3.52

0.15

0.02

655

0.00

150.

0618

0.00

170.

689

0.01

90.

0854

0.00

250.

5331

076

529

3065

858

531.

511

528.

115

99.4

NB3

15d_

1023

.93

79.3

61.7

1.29

1800

04.

352

0.1

0.04

019

0.00

240.

0677

0.00

181.

180.

031

0.13

140.

0038

0.53

9383

796

4684

955

790.

515

795.

522

100.

6N

B315

d_11

72.6

480

122

3.93

3100

0017

.78

0.67

0.06

40.

005

0.08

960.

0023

3.28

20.

094

0.25

420.

0083

0.65

6294

812

5295

1414

5014

7622

1460

4298.9

NB3

15d_

1222

.812

5.4

82.2

1.53

3200

05.

190.

170.

0279

80.

0016

0.05

787

0.00

150.

748

0.02

0.08

920.

0025

0.55

2836

155

832

516

5856

6.4

1255

115

97.3

NB3

15d_

1321

.711

3.6

79.4

1.43

2000

04.

660.

20.

0277

90.

0017

0.06

120.

0027

0.74

40.

031

0.08

360.

0025

0.27

4480

355

433

604

8256

217

517.

315

92.0

NB3

15d_

1435

.214

8.9

129.

91.

1519

000

3.77

80.

099

0.02

798

0.00

160.

0582

0.00

170.

735

0.02

0.08

754

0.00

240.

4281

882

558

3252

362

559

1254

0.9

1496.8

NB3

15d_

1551

.214

859

.52.

4914

000

8.34

0.25

0.08

850.

0052

0.10

50.

0026

4.31

10.

110.

2844

0.00

80.

5776

244

1713

9717

0945

1694

.220

1613

4095.2

NB3

15d_

1666

.912

296

.51.

2633

000

4.26

10.

086

0.07

160.

0041

0.08

492

0.00

22.

850.

072

0.23

430.

0066

0.61

6214

513

9777

1310

4713

6819

1357

3599.2

NB3

15d_

1758

.115

3.7

652.

3610

5000

8.88

0.23

0.09

50.

0054

0.10

791

0.00

255.

173

0.13

0.33

430.

0094

0.62

6535

418

3410

017

6243

1847

2118

5946

100.

6N

B315

d_18

27.9

102

108

0.94

1280

03.

270.

120.

0271

0.00

160.

0575

0.00

160.

705

0.02

20.

086

0.00

250.

5757

394

540

3149

962

540.

513

531.

815

98.4

NB3

15d_

1910

9.5

317

401

0.79

1500

02.

651

0.07

30.

0288

80.

0017

0.05

857

0.00

150.

761

0.02

10.

0918

0.00

270.

5979

723

575

3354

357

573.

712

566.

416

98.7

NB3

15d_

2031

.417

6.9

44.8

43.

9530

000

9.86

0.38

0.07

210.

0045

0.08

070.

0023

2.01

90.

071

0.17

850.

0065

0.68

3446

514

0685

1209

5611

2024

1058

3594.5

NB3

15d_

2151

.826

320

5.9

1.28

7000

04.

638

0.09

60.

0293

40.

0017

0.06

096

0.00

150.

757

0.02

0.09

360.

0026

0.58

8749

258

4.5

3363

254

572.

511

576.

515

100.

7N

B315

d_22

55.7

264.

517

3.9

1.52

6400

4.28

0.23

0.03

920.

0035

0.09

220.

0068

1.11

10.

086

0.09

10.

0026

0.30

9457

377

568

1370

120

746

3856

1.4

1575.3

NB3

15d_

2349

.915

4.3

213.

60.

7219

100

2.59

80.

054

0.02

729

0.00

150.

0609

0.00

170.

696

0.01

90.

0868

90.

0024

0.48

3358

254

4.2

3062

660

535.

911

537.

114

100.

2N

B315

d_24

22.4

122.

710

1.8

1.21

1200

04.

540.

150.

0261

50.

0016

0.06

130.

0018

0.67

90.

019

0.08

423

0.00

230.

4360

782

522

3164

564

525.

412

521.

314

99.2

NB3

15d_

2512

3.5

218

156.

41.

3928

000

5.45

50.

120.

0929

0.00

520.

1147

20.

0027

4.81

70.

120.

3207

0.00

930.

6281

815

1796

9718

7342

1788

2117

9345

100.

3N

B315

d_26

169.

446

141

31.

1222

900

4.11

60.

10.

0482

70.

0027

0.07

755

0.00

191.

565

0.04

20.

1548

0.00

440.

6081

936

953

5211

3248

955

1792

825

97.2

NB3

15d_

2731

.215

261

.72.

4628

000

9.43

0.24

0.06

250.

0038

0.08

350.

0021

2.20

30.

064

0.20

20.

0062

0.64

6837

1226

7312

7750

1180

2011

8633

100.

5N

B315

d_28

7615

0.5

106.

61.

4146

000

5.27

50.

120.

0844

0.00

490.

1039

0.00

253.

780.

120.

2792

0.00

910.

7205

752

1638

9116

9245

1584

2515

8646

100.

1N

B315

d_29

11.3

469

.247

.21.

4731

005.

380.

170.

0282

90.

0017

0.06

30.

0021

0.75

90.

025

0.09

290.

0027

0.42

7502

756

434

683

7157

214

572.

916

100.

2N

B315

d_30

14.1

963

.827

.12.

3559

008.

850.

240.

0619

0.00

370.

0842

0.00

222.

238

0.06

0.20

490.

0058

0.55

1681

912

1371

1291

5211

9119

1201

3110

0.8

NB3

15e_

0163

.119

623

70.

8316

000

30.

180.

0292

90.

0012

0.06

020.

0011

0.77

80.

016

0.09

350.

0011

0.47

0078

458

324

602

4258

3.7

9.2

576.

26.

398.7

NB3

15e_

0219

.85

103.

176

.51.

3550

000

4.25

0.22

0.02

765

0.00

120.

0617

0.00

150.

739

0.01

70.

0874

0.00

120.

2005

182

551

2364

651

561

1054

1.6

7.6

96.5

±2σ2

206 Pb

/ 23

8 U±2σ2

%

con

208 Pb

/2

32Th

±2σ2

207 Pb

/2

06Pb

±2σ2

207 Pb

/ 23

5 U

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U±2σ2

Rho3

Mea

sure

d co

ncen

trat

ions

1Is

otop

ic ra

tios

Cal

cula

ted

age

s (M

a)

Ana

lysis

Id

entif

ier

Pb

(ppm

)U

(p

pm)

Th

(ppm

)U

/Th

206 Pb

/

204 Pb

208 Pb

/ 20

6 Pb±2σ2

208 Pb

/ 23

2 Th±2σ2

207 Pb

/ 20

6 Pb±2σ2



Tabl

eA2.

Con

tinue

d.

NB3

15e_

0315

.25

116.

460

.71.

9210

000

6.46

0.33

0.02

686

0.00

110.

0584

0.00

110.

709

0.01

40.

0881

80.

0009

10.

3475

069

536

2253

042

543.

28.

354

4.7

5.4

100.

3N

B315

e_04

52.5

267.

825

1.1

1.07

2000

04.

069

0.2

0.02

216

0.00

099

0.06

350.

0013

0.77

10.

020.

0885

0.00

150.

6153

002

443

2071

943

580

1154

6.6

9.2

94.2

NB3

15e_

0527

424

319

91.

2220

0000

4.9

0.47

0.15

140.

0067

0.18

680.

0018

13.2

0.22

0.51

470.

008

0.82

3220

928

4712

027

1216

2692

1626

7534

99.4

NB3

15e_

0623

.210

9.7

95.8

1.15

1600

04.

041

0.2

0.02

644

0.00

110.

0586

0.00

120.

705

0.01

60.

0868

90.

0009

90.

4361

122

527

2154

749

540.

89.

653

75.

999.3

NB3

15e_

0718

.81

91.7

78.8

1.16

1000

4.01

0.2

0.02

601

0.00

110.

0595

0.00

130.

693

0.01

60.

0845

0.00

110.

3745

602

519

2357

049

533.

59.

552

3.1

6.3

98.1

NB3

15e_

0842

.514

9.9

164.

70.

9130

000

3.00

30.

140.

0278

30.

0011

0.05

850.

0011

0.72

50.

011

0.09

029

0.00

098

0.01

6878

554.

721

534

4055

2.8

6.8

557.

25.

810

0.8

NB3

15e_

0928

.716

411

5.1

1.42

2100

04.

810.

240.

027

0.00

110.

0595

0.00

110.

709

0.01

40.

0868

70.

0009

0.37

9960

553

822

579

3854

4.9

8.6

537

5.4

98.6

NB3

15e_

1012

.11

59.1

44.3

1.33

5000

4.61

0.24

0.02

949

0.00

130.

0609

0.00

120.

835

0.01

90.

0991

0.00

120.

5010

813

587

2663

346

615

1060

97.

399.0

NB3

15e_

1131

.817

213

4.2

1.28

1700

04.

330.

220.

0255

70.

001

0.05

820.

0011

0.68

50.

013

0.08

574

0.00

089

0.28

0954

551

0.3

2052

241

528.

87.

653

0.3

5.3

100.

3N

B315

e_12

32.1

174

134.

21.

3040

000

4.38

10.

220.

0256

60.

001

0.05

790.

001

0.67

80.

013

0.08

526

0.00

095

0.45

2863

851

2.1

2051

240

524.

67.

652

7.4

5.6

100.

5N

B315

e_13

83.5

411

336

1.22

2300

04.

026

0.19

0.02

677

0.00

10.

0587

10.

0007

0.70

80.

010.

0872

70.

0008

80.

5582

5253

3.9

2055

026

542.

96.

153

9.3

5.2

99.3

NB3

15e_

1423

.09

146.

294

.11.

5511

000

5.08

0.26

0.02

691

0.00

120.

0622

0.00

180.

697

0.01

90.

0819

0.00

096

0.06

7327

953

723

659

5853

611

507.

45.

794.7

NB3

15e_

1530

.213

9.7

130

1.07

9000

03.

634

0.17

0.02

505

0.00

099

0.05

850.

001

0.66

90.

012

0.08

321

0.00

091

0.38

0136

500

1953

838

519.

27.

351

5.2

5.4

99.2

NB3

15e_

1658

.745

722

5.9

2.02

9000

06.

910.

330.

0283

40.

0011

0.05

965

0.00

067

0.75

80.

011

0.09

230.

001

0.64

1796

856

4.8

2258

624

572.

36.

556

9.1

6.1

99.4

NB3

15e_

1790

.218

6.8

172.

61.

0813

000

3.79

50.

190.

0566

70.

0021

0.08

020.

0009

82.

120.

032

0.19

220.

0026

0.64

0383

1114

4111

9724

1154

1111

3314

98.2

NB3

15e_

1810

8.8

218.

812

6.1

1.74

1050

006.

380.

30.

094

0.00

360.

1224

0.00

125.

462

0.07

20.

3241

0.00

340.

6786

632

1816

6719

8918

1894

1118

0916

95.5

NB3

15e_

1926

.520

810

5.9

1.96

1400

06.

640.

320.

0269

0.00

110.

0586

60.

0007

90.

728

0.01

10.

0904

40.

0009

80.

5019

068

536

2154

630

555

6.5

558.

15.

810

0.6

NB3

15e_

2028

.65

130.

112

4.4

1.05

1600

3.65

10.

180.

0251

50.

001

0.06

010.

001

0.68

50.

014

0.08

297

0.00

086

0.58

603

502

2059

839

528.

98.

351

3.8

5.1

97.2

NB3

15e_

2179

.721

731

80.

6818

000

2.28

20.

110.

0271

80.

001

0.05

804

0.00

083

0.71

350.

0096

0.08

960.

001

0.33

6594

542.

120

527

3254

6.4

5.7

553.

36

101.

3N

B315

e_22

60.8

246

251.

30.

9818

000

3.36

30.

170.

0262

40.

001

0.05

845

0.00

089

0.70

60.

013

0.08

790.

0011

0.57

2434

452

3.5

2054

033

541.

77.

554

2.9

6.3

100.

2N

B315

e_23

32.4

215

134.

11.

6017

000

5.24

0.26

0.02

614

0.00

110.

0588

80.

0008

90.

677

0.01

10.

0833

90.

0007

90.

4069

205

521

2155

333

524.

46.

451

6.3

4.7

98.5

NB3

15e_

2412

0.4

939

454.

42.

0712

000

6.67

0.33

0.02

894

0.00

130.

0602

0.00

110.

766

0.01

90.

0919

40.

0009

0.77

6725

357

625

598

3557

610

567

5.3

98.4

NB3

15e_

2545

.261

.850

1.24

2000

04.

650.

290.

0981

0.00

40.

1199

0.00

165.

787

0.08

70.

3518

0.00

410.

5244

095

1890

7319

5023

1943

1319

4219

99.9

NB3

15e_

2659

.129

2.1

236.

81.

2320

000

4.21

40.

210.

027

0.00

10.

0618

0.00

120.

759

0.01

50.

0895

0.00

091

0.29

0911

153

8.4

2065

440

572.

28.

755

2.5

5.4

96.6

NB3

15e_

2727

8.3

250.

430

4.3

0.82

7500

03.

035

0.14

0.09

990.

0036

0.12

051

0.00

085

5.84

60.

049

0.35

20.

0029

0.63

9927

419

2467

1964

1219

52.7

7.3

1944

1499.6

NB3

15e_

2810

6.3

298

157.

21.

9051

000

6.88

0.33

0.07

354

0.00

270.

0961

90.

0007

73.

534

0.04

30.

2668

0.00

250.

7532

943

1434

5215

4915

1533

.79.

515

2413

99.4

NB3

15e_

2977

354.

711

8.4

3.00

3200

011

.40.

690.

0707

0.00

270.

0920

60.

0006

43.

162

0.03

50.

2498

0.00

250.

7869

409

1384

5314

6613

1448

.38.

314

3713

99.2

NB3

15e_

3024

.914

699

.21.

4729

004.

980.

250.

0272

30.

0011

0.06

140.

0012

0.75

50.

016

0.08

944

0.00

096

0.40

0817

954

321

639

4357

0.3

9.5

552.

15.

696.8

NB3

15f_

0146

.929

318

61.

5830

000

5.5

0.32

0.02

690.

0011

0.06

270.

0017

0.77

50.

026

0.08

860.

0013

0.61

5196

153

621

684

5158

114

547.

37.

494.2

NB3

15f_

0211

730

624

41.

2530

000

4.96

0.45

0.05

290.

002

0.07

380.

0012

1.72

30.

029

0.17

020.

0025

0.47

4563

510

4138

1030

3310

1912

1013

1499.4

NB3

15f_

0365

241

176

1.37

3000

04.

870.

230.

0408

60.

0014

0.06

728

0.00

097

1.25

70.

020.

1354

0.00

140.

4625

932

809

2783

930

825.

88.

781

8.7

7.9

99.1

NB3

15f_

0410

5.2

137.

611

61.

1934

000

4.42

90.

190.

0988

0.00

320.

1225

0.00

125.

995

0.07

50.

3547

0.00

390.

6595

387

1904

5919

9018

1974

1119

5719

99.1

NB3

15f_

0515

.63

62.0

558

.85

1.05

500

3.56

0.21

0.02

960.

0015

0.07

390.

0027

0.90

70.

033

0.08

870.

0014

0.20

7242

559

029

1014

7365

317

547.

78.

183.9

NB3

15f_

0698

359

202

1.78

9300

05.

80.

270.

0521

0.00

220.

078

0.00

121.

798

0.03

70.

1678

0.00

270.

6730

0910

2742

1142

3110

4313

999

1595.8

NB3

15f_

0735

.216

911

6.6

1.45

3500

04.

580.

260.

0319

0.00

140.

068

0.00

210.

881

0.03

0.09

340.

0012

0.42

3888

463

527

868

6664

116

576.

97.

390

.0N

B315

f_08

38.8

244

157.

81.

5570

000

5.41

0.25

0.02

693

0.00

091

0.05

957

0.00

099

0.73

30.

013

0.08

920.

001

0.41

2491

753

7.1

1857

837

557.

67.

555

0.7

6.2

98.8

NB3

15f_

0920

.92

80.7

78.3

1.03

9000

03.

220.

180.

0294

0.00

140.

0759

0.00

40.

875

0.04

80.

0831

0.00

150.

2816

301

585

2810

6010

063

325

514.

68.

881.3

NB3

15f_

1039

.418

516

21.

1470

000

4.07

0.21

0.02

650.

0009

20.

0585

50.

0009

20.

691

0.01

20.

0856

0.00

110.

4925

028

529

1854

134

532.

87

529.

36.

599.3

NB3

15f_

1116

.82

369

48.4

17.

6211

0000

27.9

1.5

0.03

810.

0016

0.06

536

0.00

098

1.13

70.

020.

1257

0.00

160.

5507

305

756

3078

032

770.

39.

376

3.1

9.3

99.1

%

con

±2σ2

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U±2σ2

±2σ2

Rho3

208 Pb

/2

32Th

207 Pb

/ 20

6 Pb±2σ2

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U

206 Pb

/

204 Pb

208 Pb

/ 20

6 Pb±2σ2

208 Pb

/ 23

2 Th±2σ2

Ana

lysis

Id

entif

ier

Pb

(ppm

)U

(p

pm)

Th

(ppm

)U

/Th

Mea

sure

d co

ncen

trat

ions

1Is

otop

ic ra

tios

Cal

cula

ted

age

s (M

a)

±2σ2

207 Pb

/2

06Pb



Tabl

eA2.

Con

tinue

d.

NB3

15f_

1264

.462

.995

.10.

6650

000

2.48

40.

120.

0738

0.00

250.

095

0.00

163.

318

0.05

80.

2527

0.00

360.

4514

762

1438

4815

2132

1484

1414

5219

97.8

NB3

15f_

1310

7.4

228.

113

2.6

1.72

6000

003.

920.

190.

0866

0.00

310.

1022

0.00

22.

808

0.07

40.

2002

0.00

480.

7014

206

1679

5716

6036

1356

2011

7625

86.7

NB3

15f_

1463

.714

8.4

91.2

1.63

9000

05.

901

0.26

0.07

610.

0025

0.09

565

0.00

113.

458

0.03

60.

2616

0.00

250.

3389

965

1482

4615

3722

1516

.88.

314

9813

98.8

NB3

15f_

157.

9736

58.

642

.44

1000

000

149.

98

0.10

140.

0045

0.11

705

0.00

115.

418

0.06

70.

3351

0.00

390.

6950

185

1949

8319

1118

1886

1118

6219

98.7

NB3

15f_

1645

288.

320

0.6

1.44

2900

05.

162

0.23

0.02

430.

0007

80.

0586

40.

0008

30.

666

0.01

10.

0823

0.00

10.

5483

517

485.

215

546

3151

7.8

6.6

510

5.9

98.5

NB3

15f_

1747

.514

0.9

197

0.72

5000

02.

536

0.12

0.02

628

0.00

093

0.05

840.

0012

0.71

0.01

40.

0882

0.00

110.

2483

244

524

1853

046

543.

88.

554

4.6

6.4

100.

1N

B315

f_18

74.2

319

285

1.12

4400

03.

670.

180.

0282

20.

0011

0.06

180.

0014

0.78

20.

022

0.09

210.

0019

0.60

6382

856

223

657

4858

612

568

1196.9

NB3

15f_

1989

.421

916

6.5

1.32

6500

04.

731

0.22

0.05

80.

002

0.08

030.

0014

2.31

70.

046

0.20

960.

0032

0.53

3271

411

4038

1199

3512

1614

1226

1710

0.8

NB3

15f_

2014

.59

81.6

50.8

1.61

1200

05.

140.

320.

0318

0.00

160.

0637

0.00

20.

782

0.02

70.

0888

0.00

180.

4409

434

632

3271

366

585

1654

811

93.7

NB3

15f_

2141

.924

1.6

164.

41.

4743

000

5.14

0.25

0.02

790.

0009

90.

0595

0.00

120.

732

0.01

70.

0885

0.00

120.

5024

741

556

2058

645

557

1054

6.3

7.3

98.1

NB3

15f_

2286

.829

335

60.

8230

000

2.71

0.15

0.02

647

0.00

10.

0693

0.00

20.

793

0.02

40.

084

0.00

20.

4509

8552

820

893

6259

515

520

1287.4

NB3

15f_

2337

.320

016

01.

2518

000

4.78

0.28

0.02

588

0.00

097

0.05

810.

0011

0.67

30.

015

0.08

40.

0011

0.53

0712

451

619

524

4352

1.7

8.8

519.

86.

399.6

NB3

15f_

2451

.424

9.6

198.

31.

2611

000

4.07

0.21

0.02

789

0.00

110.

0654

0.00

280.

763

0.03

30.

0845

0.00

110.

1838

833

556

2178

090

573

1852

2.7

6.6

91.2

NB3

15f_

2527

.615

1.6

111.

41.

3680

000

4.57

0.22

0.02

712

0.00

099

0.06

160.

0013

0.73

50.

016

0.08

630.

001

0.32

2647

254

120

650

4755

8.4

9.5

533.

36

95.5

NB3

15f_

2622

928

528

01.

0210

0000

3.87

0.17

0.08

960.

0029

0.10

910.

0013

4.64

90.

064

0.30

780.

0033

0.55

0418

1735

5317

8222

1757

1217

3016

98.5

NB3

15f_

2717

0.2

931

382.

22.

4413

0000

8.85

0.38

0.04

829

0.00

150.

0722

30.

0006

71.

671

0.01

80.

1677

0.00

170.

6078

6795

329

992

1899

6.8

6.8

999.

19.

310

0.2

NB3

15f_

2836

145

145

1.00

03.

552

0.17

0.02

713

0.00

094

0.05

850.

0012

0.73

50.

016

0.09

110.

0011

0.37

8349

454

118

539

4656

09.

356

2.1

6.7

100.

4N

B315

f_29

63.1

256.

624

4.6

1.05

9000

03.

687

0.18

0.02

829

0.00

110.

0626

0.00

210.

773

0.02

70.

0892

0.00

110.

2864

193

564

2167

965

580

1555

0.6

6.6

94.9

NB3

15f_

3011

6.5

862

479

1.80

3000

006.

473

0.28

0.02

654

0.00

087

0.05

807

0.00

064

0.72

840.

0092

0.09

10.

0011

0.60

3170

952

9.4

1753

125

555.

35.

456

1.5

6.4

101.

1N

B315

g_01

245.

294

737

32.

5422

0000

9.59

0.36

0.06

750.

0014

0.09

543

0.00

088

3.59

10.

051

0.26

980.

0036

0.77

7584

213

2126

1534

1715

4711

1539

1899.5

NB3

15g_

0223

.414

598

.31.

4812

000

4.99

0.2

0.02

467

0.00

056

0.06

0.00

095

0.70

20.

011

0.08

469

0.00

093

0.33

5405

492

1159

334

540.

76.

752

45.

596.9

NB3

15g_

0360

.436

3.4

774.

7216

000

21.3

1.9

0.08

260.

0016

0.11

149

0.00

086

4.80

80.

058

0.31

070.

0036

0.78

7963

816

0329

1824

1417

8510

1744

1897.7

NB3

15g_

0427

147.

611

5.3

1.28

04.

490.

180.

0244

50.

0005

10.

0603

0.00

120.

706

0.01

60.

0845

0.00

110.

4864

734

488

1061

544

541.

39.

252

3.1

6.3

96.5

NB3

15g_

0549

.213

195

.61.

3730

000

5.05

0.26

0.05

550.

0011

0.07

895

0.00

097

2.10

90.

030.

1926

0.00

240.

5829

705

1091

2011

6524

1150

.69.

811

3513

98.6

NB3

15g_

0614

.957

55.8

1.02

4400

3.8

0.27

0.02

770.

0011

0.06

130.

0018

0.74

10.

022

0.08

740.

0013

0.27

2279

355

222

619

6556

113

539.

98

96.2

NB3

15g_

0777

.319

9.6

100.

11.

9959

000

7.41

30.

260.

0825

0.00

120.

1074

20.

0009

84.

546

0.05

50.

3054

0.00

320.

6820

824

1602

2317

5317

1738

.310

1718

1698.8

NB3

15g_

0858

.231

4.8

259.

81.

2126

000

4.27

70.

160.

0239

30.

0003

90.

0590

40.

0008

80.

676

0.01

0.08

293

0.00

087

0.34

3847

847

87.

755

933

524

6.3

513.

65.

298.0

NB3

15g_

0910

111

5.1

86.5

1.33

2500

05.

050.

190.

1264

0.00

260.

1797

0.00

2311

.14

0.24

0.44

990.

0069

0.81

0408

924

0546

2648

2125

3320

2394

3094.5

NB3

15g_

1026

.310

310

01.

0380

03.

60.

180.

0286

10.

0008

0.06

360.

0016

0.83

20.

022

0.09

520.

0015

0.37

7514

957

016

721

5261

513

586.

28.

995.3

NB3

15g_

1118

529

714

02.

1212

0000

7.33

0.31

0.15

050.

0047

0.23

90.

0026

16.1

50.

40.

491

0.01

10.

8983

976

2832

8231

1118

2883

2425

7447

89.3

NB3

15g_

1255

.523

422

21.

0518

000

3.89

0.21

0.02

846

0.00

061

0.05

908

0.00

092

0.72

70.

012

0.08

960.

0011

0.44

5816

956

712

560

3455

4.2

6.9

553.

16.

699.8

NB3

15g_

1316

.595

.665

.31.

4650

000

5.1

0.24

0.02

785

0.00

067

0.05

990.

0013

0.72

80.

016

0.08

834

0.00

096

0.27

2390

755

513

581

4755

4.1

9.1

545.

75.

798.5

NB3

15g_

1459

.817

6.8

221.

40.

8020

000

2.69

50.

10.

0301

90.

0005

50.

0611

0.00

10.

806

0.01

50.

096

0.00

130.

5195

274

601

1163

335

599.

68.

459

0.8

7.4

98.5

NB3

15g_

1528

.586

.770

.91.

2210

900

2.75

0.13

0.04

450.

0017

0.11

130.

0039

1.42

20.

055

0.09

280.

0013

0.42

8543

988

033

1796

6689

624

572

7.9

63.8

NB3

15g_

1654

.151

522

1.8

2.32

9000

08.

240.

310.

0272

30.

0004

60.

0584

70.

0006

30.

737

0.01

0.09

160.

001

0.63

1855

654

2.9

9.1

542

2356

0.2

5.9

565

610

0.9

NB3

15g_

1742

.420

317

91.

1321

000

3.9

0.16

0.02

610.

0006

60.

0587

0.00

120.

705

0.01

60.

0872

0.00

120.

4587

154

521

1354

545

542.

59.

953

8.9

7.1

99.3

NB3

15g_

1851

.229

1.4

161.

21.

8170

000

5.20

80.

190.

0355

90.

0008

60.

0625

40.

0009

80.

831

0.01

50.

0966

0.00

110.

5106

962

707

1769

333

614.

88.

559

4.4

6.5

96.7

NB3

15g_

1912

5.7

454

158.

32.

8716

0000

11.0

40.

480.

0876

0.00

120.

1118

80.

0008

64.

909

0.06

50.

3184

0.00

360.

8151

592

1697

2318

3013

1802

1117

8218

98.9

NB3

15g_

2010

520

3.7

150.

61.

3535

000

4.83

10.

170.

0774

0.00

120.

0958

0.00

086

3.55

30.

040.

2692

0.00

280.

6590

326

1506

2315

4117

1538

.29

1536

1499.9

±2σ2

206 Pb

/ 23

8 U±2σ2

%

con

208 Pb

/2

32Th

±2σ2

207 Pb

/2

06Pb

±2σ2

207 Pb

/ 23

5 U

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U±2σ2

Rho3

Mea

sure

d co

ncen

trat

ions

1Is

otop

ic ra

tios

Cal

cula

ted

age

s (M

a)

Ana

lysis

Id

entif

ier

Pb

(ppm

)U

(p

pm)

Th

(ppm

)U

/Th

206 Pb

/

204 Pb

208 Pb

/ 20

6 Pb±2σ2

208 Pb

/ 23

2 Th±2σ2

207 Pb

/ 20

6 Pb±2σ2



Tabl

eA2.

Con

tinue

d.

NB3

15g_

2242

.616

4.5

178.

30.

9220

000

3.16

40.

140.

0253

90.

0005

20.

0569

0.00

160.

672

0.02

0.08

50.

0013

0.36

1365

650

710

471

6152

112

525.

87.

910

0.9

NB3

15g_

2319

.03

88.4

83.6

1.06

2500

3.91

0.17

0.02

428

0.00

079

0.06

10.

0019

0.73

20.

023

0.08

650.

0013

0.25

7256

448

516

639

7255

613

534.

57.

496.1

NB3

15g_

2479

.118

2.5

123.

81.

4769

000

4.99

0.2

0.06

640.

0013

0.08

411

0.00

091

2.64

80.

034

0.22

670.

0027

0.62

0104

312

9824

1290

2113

12.9

9.5

1317

1410

0.3

NB3

15g_

2522

.82

144.

991

.91.

5890

000

5.24

0.2

0.02

625

0.00

063

0.05

990.

0013

0.73

30.

017

0.08

840.

0009

90.

3701

7252

412

581

4755

7.4

9.8

546

5.8

98.0

NB3

15g_

2648

.923

616

41.

4427

000

3.96

0.48

0.03

078

0.00

066

0.06

650.

0014

0.92

50.

020.

1003

0.00

130.

3430

4861

313

812

4766

411

615.

97.

792.8

NB3

15g_

2725

.911

4.3

106.

91.

0713

000

3.59

50.

140.

0257

30.

0005

80.

0583

0.00

120.

696

0.01

60.

086

0.00

110.

4564

116

513

1152

147

535.

29.

453

1.7

6.7

99.3

NB3

15g_

2837

.418

415

31.

2070

000

4.18

0.2

0.02

617

0.00

059

0.05

837

0.00

099

0.69

50.

012

0.08

591

0.00

096

0.35

0684

652

212

532

3753

5.3

7.3

531.

25.

799.2

NB3

15g_

2932

170.

811

7.9

1.45

9000

04.

550.

180.

0284

20.

0005

10.

0634

0.00

180.

791

0.02

60.

0898

0.00

110.

5270

426

566

1069

158

589

1455

4.5

6.4

94.1

NB3

15g_

3028

.116

9.4

111.

51.

5217

000

5.2

0.35

0.02

630.

001

0.05

960.

0019

0.76

50.

023

0.09

320.

002

0.26

9801

952

520

573

6857

613

574

1299.7

Wei

ghte

d m

eans

of p

rim

ary

refe

renc

e m

ater

ial

9150

0 (n

=85)

15.0

481

.54

30.0

92.

7138

364.

9425

39.

3729

0.52

20.

0541

20.

0026

0.07

490.

0018

91.

8559

0.05

230.

1795

10.

0035

50.

4940

114

1065

.19.

410

54.7

11.8

1063

.13.

410

63.8

3.7

Wei

ghte

d m

eans

of s

econ

dary

refe

renc

e m

ater

ial(s

)FC

1 (n

=77)

140.

5650

1.73

257.

141.

9530

1474

.712

66.

3923

0.26

90.

0570

10.

002

0.07

679

0.00

131

1.98

060.

0414

0.18

743

0.00

367

0.64

5122

510

93.7

3.0

1104

.23.

411

05.8

1.4

1102

.31.

8Pe

ixe

(n=3

7)6.

7520

2.58

26.3

67.

6935

802.

526

.65

1.55

50.

0273

50.

0014

90.

0594

10.

0012

90.

7427

0.01

690.

0908

40.

0015

70.

4405

425

548.

74.

555

9.4

7.3

562.

91.

556

2.4

1.3

R33

(n=5

0)50

.51

302.

6426

3.06

1.15

3433

3.89

831

4.68

850.

255

0.02

059

0.00

091

0.05

616

0.00

172

0.51

760.

0168

0.06

693

0.00

146

0.41

6241

401.

42.

042

3.6

7.7

419.

11.

341

7.0

1.1

GM

10-0

1 Th

roug

hfar

e Fo

rmat

ion

(UTM

- 6

8075

9E, 4

9489

58N

; Gri

d Zo

ne 1

9T)

GM

10-0

1a_0

0116

6.7

170.

713

6.4

1.25

1080

004.

358

0.27

0.13

210.

0049

0.16

290.

0025

10.2

730.

090.

4572

0.00

90.

6631

424

2507

8824

8420

2459

.18.

124

2740

98.7

GM

10-0

1a_0

0213

7.8

349.

613

4.3

2.60

3000

008.

450.

540.

1117

0.00

430.

1281

0.00

216.

350.

10.

3591

0.00

840.

7145

333

2140

7820

6929

2024

1519

7740

97.7

GM

10-0

1a_0

037.

6933

.57.

574.

4350

0013

.74

10.

1117

0.00

630.

1217

0.00

255.

720.

10.

3417

0.00

830.

5577

116

2136

110

1973

3719

3115

1894

4098.1

GM

10-0

1a_0

049.

8878

.29.

568.

1850

000

282.

20.

1165

0.00

630.

1293

0.00

246.

598

0.08

10.

3718

0.00

850.

5858

3522

2411

020

8233

2061

1120

3740

98.8

GM

10-0

1a_0

0510

5.1

165.

810

0.4

1.65

1400

05.

097

0.32

0.11

560.

0047

0.12

540.

002

6.26

10.

076

0.36

060.

008

0.71

5121

2210

8520

3329

2013

1119

8736

98.7

GM

10-0

1a_0

0629

4.3

696

239.

32.

9128

0000

8.75

0.56

0.13

580.

0056

0.15

90.

0025

9.01

0.14

0.41

130.

0096

0.74

3095

625

7310

024

4226

2337

1422

1944

95.0

GM

10-0

1a_0

0752

.978

.853

.71.

4721

000

4.69

30.

30.

1114

0.00

450.

1229

0.00

226.

078

0.09

20.

3606

0.00

810.

6077

0421

3482

1993

3319

8513

1984

3899.9

GM

10-0

1a_0

0823

016

7075

62.

2164

700

11.4

10.

740.

0348

0.00

210.

106

0.00

182.

464

0.03

60.

1674

0.00

390.

6872

764

691

4117

3032

1264

1299

822

79.0

GM

10-0

1a_0

0912

0928

9021

971.

3216

1000

3.79

0.27

0.06

360.

0034

0.13

240.

0034

3.51

0.12

0.19

280.

008

0.78

6380

912

4664

2127

4415

2728

1136

4374.4

GM

10-0

1a_0

1015

1.4

384.

914

9.7

2.57

2500

008.

20.

520.

1153

0.00

460.

126

0.00

26.

209

0.08

80.

3588

0.00

830.

7381

851

2204

8320

4227

2008

1319

7938

98.6

GM

10-0

1a_0

1122

4.4

326

162.

72.

0016

0000

6.39

0.42

0.15

790.

0062

0.19

290.

0035

13.2

20.

330.

502

0.01

60.

8231

186

2962

110

2764

3026

9224

2621

6797.4

GM

10-0

1a_0

1434

8.2

649

362.

11.

7915

0000

4.81

0.32

0.11

20.

0046

0.11

780.

0022

4.87

50.

099

0.30

160.

0081

0.71

9570

221

4584

1920

3317

9617

1698

4094.5

GM

10-0

1a_0

1575

.819

2.8

75.1

2.57

5700

08.

110.

520.

115

0.00

470.

1277

0.00

216.

372

0.09

70.

3623

0.00

850.

7164

184

2200

8420

6328

2026

1319

9240

98.3

GM

10-0

1a_0

1632

6.5

316

241

1.31

2200

004.

395

0.28

0.15

590.

0059

0.18

920.

003

13.5

10.

180.

5186

0.01

20.

7485

016

2927

100

2734

2627

1413

2691

5299.2

GM

10-0

1a_0

1720

993

915

1.8

6.19

3300

0018

.72.

20.

1586

0.00

920.

1875

0.00

6411

.66

0.37

0.45

40.

018

0.56

1869

929

7016

027

1654

2575

3024

1180

93.6

GM

10-0

1a_0

1834

0.5

525

373.

61.

4127

0000

4.59

60.

290.

105

0.00

410.

1256

0.00

25.

867

0.08

60.

339

0.00

790.

7382

6520

1774

2035

2819

5413

1881

3896.3

GM

10-0

1a_0

1922

4.1

873

171.

75.

0813

0000

14.9

0.94

0.15

210.

0059

0.17

640.

0029

10.7

70.

150.

4448

0.01

10.

7770

625

2861

100

2617

2725

0213

2370

5194.7

GM

10-0

1a_0

2073

.925

6.4

89.8

2.86

1070

009.

750.

630.

0941

0.00

380.

1058

0.00

194.

484

0.05

50.

3066

0.00

640.

5149

119

1817

7017

2533

1727

1017

2432

99.8

GM

10-0

1a_0

2143

861

233

1.8

1.84

6000

005.

790.

380.

1538

0.00

610.

191

0.00

3512

.47

0.24

0.47

70.

013

0.74

1033

2892

110

2748

3026

3918

2512

5895.2

GM

10-0

1a_0

2236

015

6079

11.

9798

000

11.4

60.

780.

0534

0.00

310.

1701

0.00

316.

720.

120.

2863

0.00

630.

5992

674

1051

6025

5731

2075

1616

2331

78.2

GM

10-0

1a_0

2328

8.8

180.

423

7.2

0.76

1200

002.

563

0.16

0.14

270.

0056

0.16

890.

0028

10.8

90.

150.

4677

0.01

0.63

1661

2696

100

2544

2825

1213

2473

4698.4

%

con

±2σ2

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U±2σ2

±2σ2

Rho3

208 Pb

/2

32Th

207 Pb

/ 20

6 Pb±2σ2

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U

206 Pb

/

204 Pb

208 Pb

/ 20

6 Pb±2σ2

208 Pb

/ 23

2 Th±2σ2

Ana

lysis

Id

entif

ier

Pb

(ppm

)U

(p

pm)

Th

(ppm

)U

/Th

Mea

sure

d co

ncen

trat

ions

1Is

otop

ic ra

tios

Cal

cula

ted

age

s (M

a)

±2σ2

207 Pb

/2

06Pb



Tabl

eA2.

Con

tinue

d.

GM

10-0

1a_0

2442

217

4344

2.2

3.94

011

.43

0.72

0.11

110.

0043

0.12

250.

0019

5.34

90.

047

0.31

660.

0068

0.78

9394

721

3078

1990

2818

76.1

7.5

1773

3394.5

GM

10-0

1a_0

2511

416

3.2

118.

11.

3826

000

4.39

90.

290.

1143

0.00

470.

1264

0.00

276.

270.

120.

3604

0.00

960.

6076

334

2187

8420

4338

2012

1719

8346

98.6

GM

10-0

1a_0

2617

251

324

72.

0832

000

7.11

0.47

0.08

30.

004

0.18

450.

0034

7.4

0.16

0.29

370.

0092

0.81

8797

1612

7426

9231

2159

1916

5946

76.8

GM

10-0

1a_0

2720

2.8

237.

415

41.

5420

0000

5.72

0.36

0.15

150.

0058

0.20

240.

0033

15.0

20.

150.

536

0.01

10.

6222

731

2851

100

2844

2628

16.2

9.6

2766

4698.2

GM

10-0

1a_0

281.

1555

.41.

929

.16

1800

021

542

0.09

50.

020.

1222

0.00

295.

456

0.09

70.

3281

0.00

950.

5742

916

1780

350

1981

4318

9215

1827

4696.6

GM

10-0

1a_0

2943

2.6

229.

432

5.8

0.70

5000

002.

321

0.15

0.15

710.

006

0.18

810.

0032

13.2

80.

20.

5144

0.01

30.

7567

916

2948

100

2723

2827

0113

2674

5499.0

GM

10-0

1a_0

3013

2.9

510

365

1.40

6420

09.

680.

70.

0432

0.00

240.

1356

0.00

225.

510.

130.

2959

0.00

790.

7987

113

854

4621

7029

1899

2016

7039

87.9

GM

10-0

1a_0

3180

.641

310

4.6

3.95

7000

0012

.24

0.78

0.09

070.

0036

0.10

10.

0015

3.89

40.

061

0.27

970.

0067

0.79

7656

517

5567

1642

2716

1113

1589

3498.6

GM

10-0

1a_0

3231

916

6.4

268

0.62

3000

02.

135

0.13

0.14

0.00

520.

1634

0.00

2510

.56

0.11

0.47

020.

0098

0.71

1213

626

4893

2488

2624

85.9

9.1

2484

4399.9

GM

10-0

1a_0

3311

5.6

86.4

90.6

0.95

4200

03.

267

0.21

0.15

040.

006

0.18

450.

0034

12.8

20.

160.

5073

0.01

10.

5290

366

2831

110

2689

2926

6512

2644

4799.2

GM

10-0

1a_0

3429

.539

.524

.86

1.59

1500

05.

170.

360.

1412

0.00

650.

1637

0.00

3610

.02

0.19

0.44

540.

011

0.51

8758

126

6612

024

9335

2433

1823

7349

97.5

GM

10-0

1a_0

3510

0.4

404

520

0.78

4200

010

.71

10.

056

0.01

20.

1313

0.00

275.

870.

130.

3246

0.01

0.74

5075

710

9022

021

1136

1954

1818

1049

92.6

GM

10-0

1a_0

3625

4.7

295

192

1.54

6000

5.11

80.

320.

1558

0.00

580.

1901

0.00

2913

.43

0.2

0.51

290.

012

0.76

9824

729

2510

027

4125

2708

1426

6751

98.5

GM

10-0

1a_0

3731

237

818

8.5

2.01

8400

05.

860.

50.

192

0.01

40.

2046

0.00

514

.65

0.31

0.51

930.

011

0.33

3807

135

4023

028

5739

2790

2026

9647

96.6

GM

10-0

1a_0

3815

0.7

601

176.

63.

4011

0000

10.4

70.

660.

1003

0.00

390.

1114

90.

0017

4.72

10.

069

0.30

720.

0073

0.78

5745

419

3271

1821

2817

6912

1726

3697.6

GM

10-0

1a_0

3937

119

9.1

299.

40.

6612

0000

2.36

20.

150.

1467

0.00

620.

1909

0.00

313

.25

0.19

0.50

330.

011

0.69

6126

227

6511

027

4726

2695

1326

2649

97.4

GM

10-0

1a_0

4014

8.5

135.

412

81.

0611

000

3.61

40.

230.

1386

0.00

520.

164

0.00

2610

.38

0.13

0.46

0.01

0.69

4373

526

2392

2494

2724

7012

2438

4598.7

GM

10-0

1a_0

4115

5.2

151.

313

4.8

1.12

5700

03.

890.

260.

1374

0.00

520.

163

0.00

2610

.18

0.12

0.45

360.

0097

0.67

8002

426

0192

2484

2724

5311

2410

4398.2

GM

10-0

1a_0

4268

.954

179

.66.

8027

0000

243

0.10

210.

0045

0.12

420.

0019

5.24

30.

094

0.30

570.

0079

0.81

5030

219

6383

2015

2818

5716

1718

3992.5

GM

10-0

1a_0

4337

.135

.227

.21.

2952

000

4.44

0.32

0.16

440.

0089

0.17

250.

004

12.6

60.

40.

529

0.01

80.

7526

742

3070

150

2578

3926

5030

2734

7510

3.2

GM

10-0

1a_0

4411

4.6

161.

492

.11.

7577

000

6.13

30.

390.

1489

0.00

560.

1831

0.00

2712

.75

0.15

0.50

560.

011

0.77

0248

2804

9926

7924

2660

1126

3647

99.1

GM

10-0

1a_0

4511

0.2

471

137

3.44

1060

009.

350.

630.

096

0.00

420.

1408

0.00

235.

130.

110.

266

0.00

720.

7973

831

1852

7622

3529

1843

1715

2037

82.5

GM

10-0

1a_0

4614

1.7

361

153.

12.

3618

0000

7.9

0.5

0.10

980.

0042

0.12

850.

0019

6.38

0.08

80.

3599

0.00

810.

7701

477

2106

7620

7725

2028

1219

8139

97.7

GM

10-0

1a_0

4716

2.6

215.

113

9.9

1.54

2000

005.

360.

340.

1387

0.00

520.

1637

0.00

2610

.56

0.13

0.46

80.

010.

6764

214

2625

9324

9127

2483

1224

7346

99.6

GM

10-0

1a_0

4818

0.2

310

196

1.58

1500

005.

284

0.34

0.11

030.

0041

0.12

590.

002

6.13

50.

070.

3518

0.00

780.

7301

385

2114

7620

4128

1995

.79.

519

4538

97.5

GM

10-0

1a_0

4937

441

932

61.

2917

0000

4.34

60.

270.

1362

0.00

50.

1644

0.00

2610

.34

0.17

0.45

580.

011

0.75

9381

225

8089

2501

2524

6315

2419

4898.2

GM

10-0

1a_0

5035

325

4.4

313

0.81

2600

003.

150.

250.

1346

0.00

50.

1616

0.00

2510

.15

0.11

0.45

450.

0093

0.66

9238

2552

8924

7026

2447

1024

1541

98.7

GM

10-0

1a_0

5120

620

721

4.6

0.96

6000

03.

209

0.2

0.11

340.

0043

0.12

980.

0022

6.59

70.

080.

3686

0.00

820.

6573

681

2170

7820

9229

2058

1120

2239

98.3

GM

10-0

1a_0

5294

.744

299

.84.

4311

0000

14.2

10.

90.

1128

0.00

440.

1265

0.00

26.

214

0.09

90.

356

0.00

850.

7544

021

2160

8020

4728

2006

1419

6241

97.8

GM

10-0

1a_0

5323

7.8

503

255

1.97

1200

006.

080.

410.

1115

0.00

430.

1238

0.00

195.

685

0.08

50.

3331

0.00

80.

7864

561

2137

7820

0828

1927

1318

5239

96.1

GM

10-0

1a_0

5419

0.8

299.

118

11.

6524

0000

5.08

0.34

0.12

660.

0058

0.14

450.

0026

7.5

0.15

0.37

990.

011

0.78

9708

924

0710

022

7831

2174

2020

7451

95.4

GM

10-0

1a_0

5562

.315

069

.62.

1632

000

7.15

0.46

0.10

650.

0042

0.12

20.

002

5.84

60.

068

0.34

750.

0074

0.64

6004

320

4476

1982

2919

5210

1922

3598.5

GM

10-0

1a_0

5656

917

2099

91.

7280

600

5.73

90.

360.

0666

0.00

280.

161

0.00

244.

878

0.06

70.

2191

0.00

490.

7594

981

1302

5324

6425

1799

1212

7726

71.0

GM

10-0

1a_0

5744

7134

.82.

0425

000

7.43

0.49

0.15

0.00

620.

1927

0.00

3213

.97

0.17

0.52

490.

011

0.61

0723

2823

110

2762

2727

4612

2722

4799.1

GM

10-0

1a_0

5849

2.3

805

429.

71.

8760

0000

5.95

60.

370.

1345

0.00

50.

1661

0.00

259.

660.

130.

4206

0.00

950.

7644

5325

5089

2516

2524

0112

2262

4394.2

GM

10-0

1a_0

5921

088

917

4.6

5.09

5100

0016

.23

10.

1414

0.00

530.

1747

0.00

2710

.70.

150.

443

0.01

10.

8248

181

2673

9426

0126

2496

1323

6248

94.6

GM

10-0

1a_0

6019

762

124

12.

5820

3000

7.4

0.5

0.09

830.

004

0.12

440.

0021

4.61

90.

071

0.27

0.00

660.

7303

3818

9574

2018

3017

5213

1540

3487.9

GM

10-0

1a_0

6121

0.1

225.

315

2.5

1.48

1000

005.

155

0.32

0.15

80.

0059

0.20

50.

0031

15.4

70.

140.

5453

0.01

10.

7125

231

2964

100

2864

2528

43.7

8.5

2805

4698.6

GM

10-0

1a_0

6298

.310

7.5

74.2

1.45

2000

04.

955

0.31

0.15

240.

0058

0.19

170.

003

13.7

60.

150.

5194

0.01

0.58

2731

828

6610

027

5625

2732

1026

9644

98.7

±2σ2

206 Pb

/ 23

8 U±2σ2

%

con

208 Pb

/2

32Th

±2σ2

207 Pb

/2

06Pb

±2σ2

207 Pb

/ 23

5 U

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U±2σ2

Rho3

Mea

sure

d co

ncen

trat

ions

1Is

otop

ic ra

tios

Cal

cula

ted

age

s (M

a)

Ana

lysis

Id

entif

ier

Pb

(ppm

)U

(p

pm)

Th

(ppm

)U

/Th

206 Pb

/

204 Pb

208 Pb

/ 20

6 Pb±2σ2

208 Pb

/ 23

2 Th±2σ2

207 Pb

/ 20

6 Pb±2σ2



Tabl

eA2.

Con

tinue

d.

GM

10-0

1a_0

6363

.973

.249

.41.

4846

000

4.61

20.

290.

1478

0.00

580.

1729

0.00

2811

0.15

0.46

120.

010.

6659

8927

8610

025

8327

2521

1224

4444

96.9

GM

10-0

1a_0

6415

6.7

199.

111

1.6

1.78

1100

005.

920.

370.

1597

0.00

590.

2145

0.00

3415

.85

0.19

0.53

630.

011

0.63

6807

429

9911

029

3725

2866

1127

6747

96.5

GM

10-0

1a_0

6522

571

169

0.42

5800

01.

506

0.09

50.

1504

0.00

640.

255

0.00

6918

.29

0.51

0.52

30.

016

0.57

5146

428

3211

032

1242

3003

2727

0970

90.2

GM

10-0

1a_0

6628

9.9

373

243.

11.

5329

0000

5.03

20.

320.

135

0.00

50.

1615

0.00

249.

950.

120.

4484

0.00

990.

7737

748

2559

8824

6925

2432

1123

8744

98.1

GM

10-0

1a_0

6715

0.3

165.

512

7.9

1.29

4500

04.

299

0.27

0.13

290.

005

0.16

010.

0025

10.0

30.

140.

4534

0.00

980.

6930

432

2522

8824

5427

2436

1324

0944

98.9

GM

10-0

1a_0

6845

949

146

41.

0617

0000

3.05

80.

210.

1138

0.00

50.

1268

0.00

235.

930.

150.

3391

0.01

10.

8306

121

7790

2051

3219

6222

1881

5295.9

GM

10-0

1a_0

694.

6514

2.4

4.61

30.8

955

000

94.7

7.6

0.11

420.

0073

0.11

890.

0019

5.51

80.

062

0.33

520.

0069

0.63

6915

421

8013

019

3629

1902

.39.

718

6333

97.9

GM

10-0

1a_0

7015

7.6

283.

215

71.

8060

0000

5.80

10.

360.

1125

0.00

430.

1276

0.00

196.

412

0.06

90.

3634

0.00

750.

7204

787

2154

7820

6227

2034

.59

1998

3598.2

GM

10-0

1a_0

7118

822

1.3

192.

61.

1510

0000

3.65

30.

230.

1104

0.00

450.

1275

0.00

216.

290.

086

0.35

750.

0088

0.77

4874

821

1681

2061

2920

1612

1969

4297.7

GM

10-0

1a_0

7217

9.3

153

145.

51.

0553

000

3.44

0.22

0.13

540.

005

0.16

320.

0025

10.2

80.

120.

4569

0.00

960.

6993

843

2567

9024

8726

2459

1124

2543

98.6

GM

10-0

1a_0

7321

0.4

207.

117

6.7

1.17

1380

003.

561

0.23

0.12

970.

005

0.16

860.

0028

9.28

0.17

0.40

020.

011

0.80

9575

524

6389

2541

2823

6416

2168

5091.2

GM

10-0

1a_0

7413

7.3

234.

513

7.7

1.70

1400

005.

440.

350.

1093

0.00

410.

1241

0.00

196.

252

0.07

60.

3658

0.00

770.

6965

287

2096

7520

1327

2014

1120

0936

99.8

GM

10-0

1a_0

7510

9.8

115.

710

8.5

1.07

5000

03.

409

0.23

0.11

010.

0042

0.12

640.

0021

6.24

90.

073

0.35

820.

0073

0.57

9181

921

1076

2045

2920

1010

1973

3598.2

GM

10-0

1a_0

7688

.220

486

.12.

3719

0000

7.31

0.46

0.11

120.

0043

0.12

790.

002

6.42

10.

064

0.36

250.

0076

0.70

4354

821

3177

2066

2820

34.2

8.7

1993

3698.0

GM

10-0

1a_0

7777

.552

395

.61

5.47

1800

0016

.02

10.

0878

0.00

350.

1017

70.

0015

3.78

10.

046

0.26

990.

0058

0.75

0773

617

0064

1654

2715

8710

1540

3097.0

GM

10-0

1a_0

7810

5.3

312

113

2.76

5790

07.

040.

490.

1007

0.00

50.

1895

0.00

316.

850.

130.

2594

0.00

630.

7402

6919

3991

2737

2720

9117

1487

3271.1

GM

10-0

1a_0

7953

.762

.650

.11.

2513

000

3.91

90.

250.

1155

0.00

450.

129

0.00

226.

766

0.09

30.

3802

0.00

840.

6358

823

2208

8220

8030

2079

1220

7639

99.9

GM

10-0

1a_0

8023

7.8

299.

117

8.2

1.68

2600

005.

808

0.37

0.14

120.

0052

0.18

610.

0029

12.9

40.

150.

5018

0.01

10.

7321

227

2670

9327

0626

2674

1126

2145

98.0

GM

10-0

1a_0

8125

534

625

51.

3621

0000

4.12

90.

270.

107

0.00

40.

1237

0.00

195.

869

0.09

10.

3438

0.00

820.

7752

016

2055

7320

0727

1956

1319

0440

97.3

GM

10-0

1a_0

8215

0.9

331

114.

92.

8850

0000

9.04

0.62

0.13

930.

0052

0.16

390.

0025

10.2

70.

130.

4551

0.00

980.

7177

226

2636

9124

9426

2458

1224

1744

98.3

GM

10-0

1a_0

8315

3.7

159.

513

5.5

1.18

1050

003.

679

0.24

0.11

990.

0057

0.16

460.

0028

9.13

0.2

0.40

290.

011

0.78

2424

522

9899

2503

3123

4721

2180

5392.9

GM

10-0

1a_0

8486

.214

1.1

92.6

1.52

1470

004.

30.

290.

1004

0.00

50.

1355

0.00

315.

690.

140.

3064

0.01

10.

7759

547

1931

9321

6441

1926

2117

2152

89.4

GM

10-0

1a_0

8515

2.8

111.

298

1.13

2000

003.

640.

250.

1663

0.00

660.

2214

0.00

3617

.17

0.24

0.56

330.

013

0.71

8562

431

0811

029

8927

2945

1328

7953

97.8

GM

10-0

1a_0

8620

246

863

30.

7482

000

3.98

0.27

0.03

510.

0026

0.14

40.

0034

4.13

0.11

0.20

550.

0077

0.77

9513

698

5022

7241

1659

2112

0441

72.6

GM

10-0

1a_0

8743

.248

.529

.39

1.65

4400

05.

170.

330.

1538

0.00

630.

1949

0.00

3414

.02

0.18

0.52

10.

011

0.56

4951

428

9011

027

8029

2749

1227

0245

98.3

GM

10-0

1a_0

8827

.844

17.6

2.50

2500

08.

80.

690.

1707

0.00

780.

2284

0.00

3918

.79

0.23

0.59

630.

013

0.62

4965

3180

140

3037

2830

2912

3013

5299.5

GM

10-0

1a_0

8914

819

4.3

91.8

2.12

3000

006.

80.

430.

1679

0.00

630.

2219

0.00

3317

.87

0.18

0.58

110.

012

0.73

7329

331

3511

029

9224

2981

.49.

729

5251

99.0

GM

10-0

1a_0

9012

813

6.3

129.

91.

0550

0000

2.12

80.

160.

1061

0.00

580.

1425

0.00

544.

940.

250.

251

0.01

70.

8332

857

2038

110

2253

6718

0643

1442

8679.8

GM

10-0

1a_0

9160

.723

258

.23.

9980

0000

11.9

40.

770.

1079

0.00

430.

1227

0.00

25.

910.

064

0.34

890.

0074

0.65

6186

120

7079

1995

2819

61.6

9.5

1929

3698.3

GM

10-0

1a_0

9266

.215

8.9

290

0.55

4600

06.

240.

440.

0230

90.

0012

0.22

390.

0036

8.78

0.17

0.28

290.

0077

0.81

3277

546

124

3007

2623

1317

1605

3969.4

GM

10-0

1a_0

9355

132

535

00.

9322

0000

2.72

10.

180.

1615

0.00

60.

2032

0.00

3214

.84

0.21

0.53

010.

012

0.72

5316

530

2610

028

4926

2803

1427

4050

97.8

GM

10-0

1a_0

9417

2.4

484

165

2.93

1600

007.

450.

530.

1111

0.00

520.

1256

0.00

245.

560.

160.

3222

0.01

10.

8288

158

2128

9520

3535

1908

2417

9954

94.3

GM

10-0

1a_0

9523

9.1

367

227.

51.

6120

0000

4.23

0.27

0.10

850.

0042

0.11

770.

0019

5.14

80.

086

0.31

670.

0075

0.73

2163

420

8176

1923

2718

4114

1772

3796.3

GM

10-0

1a_0

9619

0.2

201.

612

31.

6434

600

2.74

60.

180.

1614

0.00

650.

1724

0.00

417.

250.

120.

3058

0.00

870.

5497

831

3023

110

2573

4021

4115

1719

4380.3

GM

10-0

1a_0

9794

.724

0.9

85.4

2.82

7000

008.

250.

570.

112

0.00

440.

1282

0.00

26.

429

0.08

10.

3622

0.00

760.

6726

277

2144

8020

7128

2035

1119

9236

97.9

GM

10-0

1a_0

9812

7.8

97.7

94.1

1.04

4000

03.

058

0.2

0.14

050.

0055

0.16

310.

0028

10.3

40.

120.

4601

0.00

990.

6065

941

2656

9724

8429

2464

1024

3944

99.0

GM

10-0

1a_0

9912

120

4.6

112

1.83

1000

005.

305

0.34

0.11

230.

0043

0.12

450.

002

6.16

50.

073

0.35

790.

0083

0.76

4674

521

5078

2018

2819

9810

1975

3898.8

GM

10-0

1a_1

0020

6.1

418.

819

2.1

2.18

1500

006.

255

0.4

0.11

120.

0043

0.12

740.

0019

6.19

0.1

0.35

060.

0085

0.79

9594

521

3179

2062

2620

0314

1936

4096.7

GM

10-0

1a_1

0154

.220

6.5

48.1

4.29

9000

0012

.44

0.8

0.11

660.

0048

0.12

840.

0021

6.59

50.

077

0.37

350.

008

0.65

4997

822

2887

2073

2920

5710

2045

3899.4

%

con

±2σ2

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U±2σ2

±2σ2

Rho3

208 Pb

/2

32Th

207 Pb

/ 20

6 Pb±2σ2

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U

206 Pb

/

204 Pb

208 Pb

/ 20

6 Pb±2σ2

208 Pb

/ 23

2 Th±2σ2

Ana

lysis

Id

entif

ier

Pb

(ppm

)U

(p

pm)

Th

(ppm

)U

/Th

Mea

sure

d co

ncen

trat

ions

1Is

otop

ic ra

tios

Cal

cula

ted

age

s (M

a)

±2σ2

207 Pb

/2

06Pb



Tabl

eA2.

Con

tinue

d.

GM

10-0

1a_1

0226

.01

56.8

18.7

43.

0338

000

9.45

0.63

0.14

540.

0063

0.18

040.

0031

12.3

30.

170.

4937

0.01

0.54

6208

427

4011

026

5328

2628

1325

8645

98.4

GM

10-0

1a_1

0315

7.9

240.

610

4.3

2.31

1100

007.

320.

510.

167

0.00

970.

2601

0.00

4920

.84

0.61

0.58

0.01

80.

8063

663

3120

170

3250

3231

3427

2947

7494.0

GM

10-0

1a_1

0459

.579

.256

.61.

4055

000

4.54

0.33

0.11

230.

0047

0.13

10.

0022

6.64

30.

082

0.36

720.

008

0.64

1408

921

5086

2108

3020

6511

2015

3897.6

GM

10-0

1a_1

0511

1.5

366

270

1.36

5420

05.

370.

390.

0451

0.00

280.

1477

0.00

294

0.15

0.19

70.

0088

0.90

0276

389

054

2321

3116

3432

1157

4770.8

GM

10-0

1a_1

0611

7.8

306

107.

42.

8590

0000

7.53

0.58

0.11

940.

0053

0.12

310.

0025

5.93

0.16

0.35

10.

012

0.80

4590

522

7895

1997

3519

6224

1937

5798.7

GM

10-0

1a_1

0780

.217

2.9

74.2

2.33

1000

006.

740.

430.

1155

0.00

470.

1258

0.00

216.

365

0.07

50.

3668

0.00

80.

6534

558

2209

8520

3930

2026

1020

1438

99.4

GM

10-0

1a_1

0829

.210

7.4

74.5

81.

4468

000

10.3

0.67

0.04

220.

0022

0.13

290.

0024

5.99

40.

080.

326

0.00

710.

5613

551

836

4221

3132

1975

1118

1834

92.1

GM

10-0

1a_1

0914

4.3

176.

513

7.4

1.28

8000

003.

827

0.24

0.11

280.

0044

0.12

570.

0022

6.35

70.

069

0.36

640.

008

0.60

8082

321

5980

2034

3020

25.2

9.5

2012

3899.3

GM

10-0

1a_1

1016

0.7

215

156.

21.

3830

0000

4.09

40.

260.

1113

0.00

430.

1251

0.00

26.

248

0.07

10.

3611

0.00

770.

6773

058

2133

7820

2729

2010

1019

8737

98.9

GM

10-0

1a_1

1198

.417

094

.41.

8070

0000

5.41

0.36

0.11

50.

0046

0.12

430.

0021

6.26

40.

091

0.36

50.

0086

0.70

2283

421

9984

2014

3020

1113

2005

4099.7

GM

10-0

1a_1

1210

.62

19.2

10.1

21.

9080

000

5.75

0.4

0.11

680.

0058

0.13

160.

0035

6.75

0.16

0.37

240.

0093

0.40

3906

722

3010

021

1046

2074

2120

3944

98.3

GM

10-0

1a_1

1359

.519

959

.43.

3590

0000

10.2

10.

660.

1116

0.00

450.

1264

0.00

26.

269

0.06

60.

3583

0.00

740.

6600

301

2138

8220

4629

2013

.19.

319

7636

98.2

GM

10-0

1a_1

1415

9.8

187

116.

41.

6115

0000

5.04

0.36

0.15

470.

0059

0.19

80.

0031

14.4

40.

140.

5272

0.01

10.

7024

9229

0610

028

0725

2777

.89

2728

4798.2

GM

10-0

1a_1

1539

8.8

1659

615

2.70

3010

008.

140.

530.

0762

0.00

380.

119

0.00

23.

892

0.05

50.

2386

0.00

590.

7564

809

1483

7119

3831

1611

1113

7931

85.6

GM

10-0

1a_1

1621

2.8

799

220.

13.

6332

0000

9.91

0.63

0.11

10.

0043

0.12

10.

0021

5.38

0.1

0.32

30.

0089

0.78

4437

221

2778

1968

3118

7916

1803

4496.0

GM

10-0

1a_1

1775

.611

3.5

72.7

1.56

9000

004.

868

0.31

0.11

930.

0046

0.13

510.

0023

7.29

50.

093

0.39

040.

0085

0.62

4599

622

7783

2164

3021

4712

2124

4098.9

GM

10-0

1a_1

1864

311

9349

02.

4320

0000

07.

012

0.44

0.15

10.

0056

0.18

780.

0028

11.7

50.

130.

4526

0.00

940.

7212

499

2842

9927

2124

2585

.29.

624

0642

93.1

GM

10-0

1a_1

1949

224

832

40.

7741

0000

2.46

50.

160.

1729

0.00

640.

222

0.00

3417

.93

0.25

0.58

510.

013

0.73

1954

3223

110

2995

2629

8613

2968

5399.4

GM

10-0

1a_1

2025

8.4

277

189.

21.

4613

0000

4.85

0.31

0.15

910.

0059

0.20

380.

0031

15.3

30.

20.

5426

0.01

20.

7415

8629

8410

028

5425

2836

1227

9252

98.4

GM

10-0

1a_1

2137

.644

40.1

51.

1020

000

3.58

80.

240.

1085

0.00

490.

1229

0.00

296.

020.

110.

3544

0.00

790.

3363

348

2082

8919

9042

1976

1619

5538

98.9

GM

10-0

1a_1

2294

.131

211

3.8

2.74

2400

008.

940.

570.

1011

0.00

430.

1266

0.00

25.

780.

068

0.32

910.

0069

0.66

5734

319

4678

2051

2919

4210

1833

3494.6

GM

10-0

1a_1

2392

.537

116

82.

2120

7000

10.4

20.

690.

0681

0.00

320.

1769

0.00

287.

469

0.09

50.

3042

0.00

680.

7226

611

1330

6126

2227

2168

1217

1234

79.0

GM

10-0

1a_1

2479

.210

1.4

54.4

1.86

1000

006.

660.

430.

1801

0.00

70.

2601

0.00

422

.72

0.23

0.63

30.

013

0.69

2029

733

4612

032

4524

3215

1031

6051

98.3

GM

10-0

1a_1

2592

.115

513

1.3

1.18

1100

003.

925

0.25

0.08

740.

0034

0.10

30.

0018

4.11

10.

052

0.28

780.

006

0.54

8394

1693

6316

7734

1655

1016

3030

98.5

GM

10-0

1a_1

2678

.116

3.2

871.

8890

0000

6.21

0.4

0.11

190.

0043

0.12

570.

0021

6.37

80.

064

0.36

660.

0076

0.60

4161

221

4478

2035

2920

29.6

9.1

2013

3699.2

GM

10-0

1a_1

2717

2.6

337.

115

0.1

2.25

1900

008.

110.

520.

1412

0.00

570.

178

0.00

2811

.98

0.14

0.48

520.

010.

6516

384

2668

100

2633

2626

0211

2549

4598.0

GM

10-0

1a_1

2821

6.8

318

304

1.05

1500

003.

353

0.21

0.08

950.

0034

0.10

352

0.00

164.

038

0.05

0.28

220.

0058

0.66

1816

1732

6216

8828

1641

1016

0229

97.6

GM

10-0

1a_1

2927

5.2

261.

222

2.8

1.17

1000

004.

131

0.26

0.15

520.

0066

0.20

850.

0033

15.3

80.

190.

533

0.01

20.

7352

489

2913

120

2891

2528

3812

2752

5297.0

GM

10-0

1a_1

3036

334

933

21.

0521

0000

3.41

50.

210.

137

0.00

520.

166

0.00

2510

.10.

150.

4412

0.00

980.

7383

447

2593

9325

1525

2442

1323

5544

96.4

GM

10-0

1a_1

3119

6.4

181.

318

30.

9930

0000

3.37

80.

210.

1353

0.00

510.

1627

0.00

2410

.221

0.09

70.

4545

0.00

920.

7345

321

2565

9024

8125

2454

8.8

2414

4198.4

GM

10-0

1a_1

3214

3.8

368

164.

82.

2335

0000

7.56

0.63

0.11

110.

0042

0.12

820.

002

6.33

60.

084

0.35

720.

0078

0.70

6767

2129

7620

7027

2024

1119

6837

97.2

GM

10-0

1a_1

3314

3.8

354

163.

62.

1659

0000

7.02

0.44

0.11

170.

0042

0.12

40.

0019

6.08

10.

087

0.35

480.

008

0.74

1364

321

4175

2011

2819

9211

1960

3798.4

GM

10-0

1a_1

3414

6.3

339

113.

22.

9935

0000

10.9

40.

690.

1618

0.00

610.

2125

0.00

3216

.55

0.18

0.56

130.

012

0.74

9571

930

3111

029

2324

2908

1028

7150

98.7

GM

10-0

1a_1

3515

435

017

4.5

2.01

7000

006.

740.

430.

112

0.00

420.

1286

0.00

26.

520.

078

0.36

720.

0076

0.66

5624

721

4576

2076

2720

4711

2016

3698.5

GM

10-0

1a_1

3618

0.5

215.

320

8.8

1.03

3200

003.

316

0.22

0.11

120.

0044

0.12

480.

0022

6.08

60.

099

0.35

330.

0079

0.62

3876

321

3080

2027

3419

8714

1950

3898.1

GM

10-0

1a_1

3744

.774

.450

.31.

4820

0000

4.91

80.

320.

1125

0.00

440.

131

0.00

236.

574

0.09

30.

363

0.00

780.

5816

015

2153

8021

0731

2054

1219

9637

97.2

GM

10-0

1a_1

3823

421

819

81.

1014

0000

3.96

50.

260.

1509

0.00

570.

1907

0.00

2813

.56

0.13

0.51

410.

011

0.81

4467

328

4010

027

4724

2718

.39.

226

7346

98.3

GM

10-0

1a_1

3933

459

632

11.

8640

0000

06.

336

0.4

0.13

350.

0049

0.16

350.

0024

10.1

60.

140.

4491

0.00

990.

7577

553

2533

8824

9025

2447

1323

9044

97.6

GM

10-0

1a_1

4020

0.6

528

188.

12.

8140

0000

09.

910.

650.

1353

0.00

510.

1644

0.00

2410

.66

0.12

0.46

870.

0097

0.73

3803

225

6491

2500

2424

9311

2477

4399.4

±2σ2

206 Pb

/ 23

8 U±2σ2

%

con

208 Pb

/2

32Th

±2σ2

207 Pb

/2

06Pb

±2σ2

207 Pb

/ 23

5 U

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U±2σ2

Rho3

Mea

sure

d co

ncen

trat

ions

1Is

otop

ic ra

tios

Cal

cula

ted

age

s (M

a)

Ana

lysis

Id

entif

ier

Pb

(ppm

)U

(p

pm)

Th

(ppm

)U

/Th

206 Pb

/

204 Pb

208 Pb

/ 20

6 Pb±2σ2

208 Pb

/ 23

2 Th±2σ2

207 Pb

/ 20

6 Pb±2σ2



Tabl

eA2.

Con

tinue

d.

GM

10-0

1a_1

4160

.349

375

6.57

8700

0019

.93

1.3

0.10

310.

0042

0.13

270.

002

5.50

90.

078

0.3

0.00

680.

7588

777

1982

7821

3227

1900

1216

9134

89.0

GM

10-0

1a_1

4219

267

821

73.

1223

0000

010

.36

0.7

0.11

030.

0044

0.13

970.

0026

6.76

0.17

0.34

720.

011

0.80

9418

721

1481

2222

3220

7823

1920

5392.4

GM

10-0

1a_1

4387

.155

018

1.5

3.03

6800

0021

.87

1.5

0.06

250.

0042

0.25

070.

0051

15.1

90.

280.

4412

0.01

10.

5957

095

1223

8031

8631

2826

1723

5551

83.3

GM

10-0

1a_1

4433

580

726

9.9

2.99

1500

000

9.62

0.6

0.15

730.

0064

0.19

920.

0029

13.8

70.

170.

503

0.01

10.

7769

922

2951

110

2818

2427

3912

2625

4895.8

GM

10-0

1a_1

4515

9.9

198.

414

61.

3661

0000

4.57

40.

290.

1384

0.00

540.

1617

0.00

2710

.17

0.13

0.45

440.

010.

6556

826

1895

2469

2924

4912

2417

4698.7

GM

10-0

1a_1

4658

.520

4.3

66.7

3.06

5000

0010

.15

0.65

0.11

070.

0044

0.12

350.

0019

6.20

90.

065

0.36

320.

0078

0.74

3063

921

2180

2004

2820

04.7

9.2

1996

3799.6

GM

10-0

1a_1

483.

8583

.54.

2219

.79

2700

0067

.66

0.11

440.

0088

0.12

560.

0021

6.20

80.

086

0.35

760.

0078

0.64

2240

921

8016

020

3329

2006

1219

7037

98.2

GM

10-0

1a_1

4972

579

487

90.

9010

0000

02.

894

0.18

0.10

440.

0039

0.12

254

0.00

185.

679

0.08

10.

3346

0.00

760.

7772

054

2007

7119

9327

1926

1318

6037

97.6

GM

10-0

1a_1

5043

.331

.137

.20.

8450

0000

2.88

80.

20.

1469

0.00

60.

1872

0.00

3713

.22

0.18

0.51

150.

012

0.54

0219

727

6911

027

1233

2693

1326

6150

98.8

GM

10-0

1a_1

5223

239

828

51.

4060

0000

04.

768

0.3

0.10

180.

0045

0.12

450.

0019

6.02

30.

070.

3497

0.00

740.

7114

9119

5883

2019

2719

7810

1933

3697.7

GM

10-0

1a_1

5324

347

827

21.

7680

0000

05.

571

0.35

0.11

210.

0042

0.12

620.

0019

6.17

70.

084

0.35

340.

0078

0.74

1983

421

4677

2045

2819

9912

1950

3797.5

GM

10-0

1a_1

5532

646

323

61.

9620

0000

06.

920.

460.

1752

0.00

680.

2472

0.00

3620

.30.

230.

5945

0.01

30.

7960

604

3262

120

3165

2331

0411

3006

5196.8

GM

10-0

1a_1

5615

837

018

2.1

2.03

9000

000

6.65

0.43

0.10

910.

0042

0.12

450.

002

6.05

90.

066

0.35

250.

0073

0.64

1595

720

9276

2022

2719

83.3

9.5

1946

3598.1

GM

10-0

1a_1

5794

.114

2.2

102.

61.

3924

0000

4.55

70.

290.

1156

0.00

440.

1303

0.00

226.

734

0.08

20.

3727

0.00

770.

5764

501

2211

8020

9829

2077

1020

4237

98.3

GM

10-0

1a_1

5814

4.9

456

162.

22.

8130

0000

08.

810.

560.

1121

0.00

450.

1241

40.

0018

6.08

80.

084

0.35

510.

0079

0.77

3835

121

4781

2016

2519

8712

1958

3898.5

GM

10-0

1a_1

5911

8.4

184.

813

9.6

1.32

7000

04.

580.

320.

108

0.00

420.

1228

0.00

26.

002

0.06

90.

3541

0.00

750.

6478

984

2072

7619

9429

1976

.59.

619

5335

98.8

GM

10-0

1a_1

6085

878

582

10.

9681

0000

03.

117

0.2

0.13

190.

005

0.16

440.

0025

9.63

0.14

0.42

350.

010.

7831

299

2503

8824

9926

2398

1322

7546

94.9

GM

10-0

1a_1

6131

232

728

71.

1421

0000

03.

870.

250.

1363

0.00

50.

1633

0.00

2510

.34

0.12

0.45

740.

0096

0.69

9609

2581

8924

8825

2467

.79.

924

2743

98.4

GM

10-0

1a_1

6218

3.1

325.

116

8.2

1.93

1000

0000

06.

684

0.42

0.13

560.

0051

0.16

660.

0025

10.5

80.

110.

4595

0.00

970.

7484

651

2569

9125

2125

2486

.19.

724

3643

98.0

GM

10-0

1a_1

6372

321

4063

33.

3810

0000

000

10.2

50.

650.

1433

0.00

540.

1675

0.00

259.

850.

095

0.42

620.

0091

0.79

1875

327

0595

2531

2524

19.9

922

8841

94.5

GM

10-0

1a_1

6469

693

356

61.

6527

0000

000

4.79

0.31

0.15

480.

0065

0.18

890.

0034

11.8

30.

250.

4576

0.01

20.

7310

953

2907

110

2734

3125

9321

2427

5493.6

GM

10-0

1a_1

6579

.529

967

.54.

4330

0000

0014

.18

0.92

0.14

620.

006

0.18

160.

0028

11.6

90.

140.

4661

0.01

0.71

2217

127

5710

026

6526

2580

1124

6544

95.5

GM

10-0

1a_1

6617

817

420

20.

8641

0000

03.

150.

220.

1139

0.00

440.

1256

0.00

196.

511

0.06

30.

3747

0.00

770.

7218

908

2179

8120

3726

2046

.58.

520

5136

100.

2G

M10

-01a

_167

660

928

563

1.65

3000

0000

5.55

0.36

0.14

460.

0053

0.17

940.

0025

11.8

90.

160.

4789

0.01

10.

8322

438

2730

9426

4623

2594

1325

2147

97.2

GM

10-0

1a_1

6825

.98

37.9

19.4

51.

9580

0000

6.99

0.48

0.16

370.

0077

0.22

150.

0045

17.8

60.

410.

583

0.01

60.

6884

226

3059

130

2985

3229

7622

2958

6599.4

GM

10-0

1a_1

6912

9.2

259.

512

9.8

2.00

8000

000

6.86

0.46

0.12

280.

0049

0.13

50.

002

7.64

30.

073

0.40

980.

0086

0.77

8667

223

4089

2162

2621

89.1

8.5

2213

3910

1.1

GM

10-0

1a_1

7066

.913

5.1

701.

9312

0000

06.

630.

430.

1175

0.00

470.

1328

0.00

217.

326

0.09

0.39

760.

0087

0.70

6169

122

4586

2133

2721

5011

2157

4010

0.3

GM

10-0

1a_1

7115

924

3.1

186

1.31

3000

000

4.57

20.

290.

1045

0.00

390.

1239

0.00

196.

235

0.06

20.

3636

0.00

730.

6682

077

2009

7120

1028

2008

.58.

719

9934

99.5

GM

10-0

1a_1

7275

.711

2.6

61.4

1.83

3700

006.

570.

430.

1493

0.00

590.

1924

0.00

2914

.18

0.13

0.53

350.

011

0.74

5885

428

1110

027

6024

2762

.48.

727

5645

99.8

GM

10-0

1a_1

7311

3.2

463.

515

1.2

3.07

1300

000

10.0

50.

640.

0902

0.00

350.

1056

60.

0015

4.33

90.

044

0.29

640.

0063

0.81

9038

417

4665

1724

2617

008.

416

7331

98.4

GM

10-0

1a_1

7464

51.9

511.

0250

0000

3.33

0.23

0.15

360.

0074

0.21

410.

0051

15.5

50.

430.

528

0.01

90.

7497

692

2886

130

2933

3828

4627

2729

8095.9

GM

10-0

1a_1

7525

2.3

249.

322

4.2

1.11

7000

000

3.84

50.

240.

1346

0.00

50.

1627

0.00

2410

.652

0.09

40.

4731

0.00

960.

7595

847

2552

8824

8225

2492

.48.

324

9642

100.

1G

M10

-01a

_176

260

284

194.

11.

4630

000

5.32

90.

340.

1605

0.00

590.

2159

0.00

3117

.65

0.13

0.59

040.

012

0.87

2378

130

0810

029

4923

2970

.26.

929

9047

100.

7G

M10

-01a

_177

51.8

87.4

55.7

1.57

6000

005.

260.

340.

1114

0.00

450.

1271

0.00

226.

607

0.09

30.

3764

0.00

810.

5969

121

3382

2054

3120

6013

2059

3810

0.0

GM

10-0

1a_1

7828

1.8

751

588

1.28

4680

005.

40.

350.

0567

0.00

260.

1394

0.00

234.

725

0.07

60.

2452

0.00

630.

7823

446

1114

4922

1729

1770

1414

1332

79.8

GM

10-0

1a_1

7954

561

847

91.

2920

000

4.54

0.36

0.13

840.

0059

0.18

710.

0031

13.1

40.

280.

509

0.01

50.

8344

446

2619

110

2715

2826

8820

2652

6598.7

GM

10-0

1a_1

8069

.316

7.5

78.6

2.13

2000

007.

180.

460.

1051

0.00

420.

1221

0.00

196.

062

0.06

10.

3587

0.00

720.

6486

113

2019

7719

8627

1983

.88.

719

7634

99.6

GM

10-0

1a_1

8172

.614

1.9

76.2

1.86

2000

006.

190.

40.

1135

0.00

480.

1325

0.00

237.

060.

089

0.38

610.

0085

0.61

6627

821

7386

2128

3021

1811

2104

3999.3

GM

10-0

1a_1

8285

611

4010

611.

0718

0000

03.

780.

240.

0976

0.00

440.

1815

0.00

319.

220.

330.

368

0.01

30.

8847

241

1881

8126

6428

2353

3520

1663

83.7

%

con

±2σ2

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U±2σ2

±2σ2

Rho3

208 Pb

/2

32Th

±2σ2

207 Pb

/2

06Pb

207 Pb

/ 20

6 Pb±2σ2

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U

206 Pb

/

204 Pb

208 Pb

/ 20

6 Pb±2σ2

208 Pb

/ 23

2 Th±2σ2

Ana

lysis

Id

entif

ier

Pb

(ppm

)U

(p

pm)

Th

(ppm

)U

/Th

Mea

sure

d co

ncen

trat

ions

1Is

otop

ic ra

tios

Cal

cula

ted

age

s (M

a)



Tabl

eA2.

Con

tinue

d.

GM

10-0

1a_1

8328

632

621

61.

5180

0000

05.

328

0.34

0.15

540.

0058

0.20

880.

0031

16.3

40.

150.

5653

0.01

10.

6787

407

2919

100

2894

2428

96.2

9.1

2888

4699.7

GM

10-0

1a_1

8460

.214

7.2

65.5

2.25

7000

007.

580.

490.

107

0.00

420.

1273

0.00

226.

469

0.07

10.

3667

0.00

750.

5348

087

2055

7620

5630

2040

.59.

620

1335

98.7

GM

10-0

1a_1

8524

6.7

322.

326

6.7

1.21

6700

003.

997

0.26

0.10

840.

0043

0.12

320.

002

6.34

60.

086

0.37

350.

0084

0.69

8725

320

8079

2001

2920

2412

2045

3910

1.0

GM

10-0

1a_1

8670

.813

3.3

56.7

2.35

2600

008.

130.

570.

1503

0.00

760.

1922

0.00

3714

.47

0.29

0.54

570.

014

0.67

0262

928

2913

027

5932

2779

1928

0657

101.

0G

M10

-01a

_187

179

1402

232

6.04

1800

000

17.9

91.

20.

0916

0.00

640.

1209

0.00

244.

960.

160.

2969

0.01

10.

8447

432

1770

120

1968

3518

1127

1675

5392.5

GM

10-0

1a_1

8820

422

720

91.

0970

0000

3.69

30.

240.

1132

0.00

420.

1285

0.00

26.

906

0.06

70.

3879

0.00

780.

6566

932

2167

7620

7427

2098

.68.

621

1336

100.

7G

M10

-01a

_189

172.

121

417

91.

2020

0000

4.05

0.29

0.11

150.

0042

0.13

20.

002

7.03

30.

068

0.38

420.

0078

0.70

3242

621

3676

2122

2621

14.7

8.5

2095

3799.1

GM

10-0

1a_1

9049

.788

.951

.49

1.73

6000

005.

930.

40.

1114

0.00

450.

1264

0.00

226.

790.

10.

3876

0.00

880.

6421

416

2135

8220

4432

2083

1321

1141

101.

3G

M10

-01a

_191

50.9

78.7

55.5

1.42

6000

004.

818

0.31

0.10

650.

0043

0.12

460.

0023

6.43

10.

076

0.37

240.

0079

0.49

6502

520

4478

2018

3220

3510

2040

3710

0.2

GM

10-0

1a_1

9214

1.3

84.6

111.

80.

7610

0000

2.59

90.

160.

1448

0.00

550.

185

0.00

2913

.12

0.16

0.51

140.

011

0.69

6987

427

3297

2697

2726

8712

2662

4699.1

GM

10-0

1a_1

9394

9966

.61.

4910

0000

05.

390.

470.

1667

0.00

760.

1715

0.00

2912

.02

0.18

0.50

730.

011

0.62

9003

131

1213

025

6928

2606

1426

4447

101.

5G

M10

-01a

_194

93.6

334.

110

1.3

3.30

1100

0011

.09

0.7

0.10

550.

004

0.12

163

0.00

186.

133

0.05

40.

3641

0.00

730.

7378

134

2028

7419

7826

1994

.27.

720

0134

100.

3G

M10

-01a

_196

269.

623

6.4

287.

80.

8220

0000

2.72

90.

170.

1068

0.00

390.

1227

0.00

196.

212

0.06

10.

3645

0.00

720.

6362

553

2051

7219

9628

2005

.38.

520

0334

99.9

GM

10-0

1a_1

9713

8.3

225

263

0.86

1600

003.

167

0.21

0.06

140.

0033

0.14

640.

0048

4.87

0.15

0.24

30.

012

0.76

0131

712

0462

2296

5717

9526

1400

6078.0

GM

10-0

1a_1

9820

7.7

366

227

1.61

1000

000

5.34

0.34

0.10

510.

0041

0.12

320.

002

6.12

50.

065

0.35

950.

0077

0.67

7173

2020

7520

0431

1993

9.3

1979

3799.3

GM

10-0

1a_1

9920

8.4

170

158.

41.

0711

0000

3.87

0.33

0.15

010.

0056

0.18

950.

003

14.8

60.

240.

5662

0.01

40.

7782

812

2826

9827

3526

2806

1528

8956

103.

0G

M10

-01a

_200

167.

817

414

0.6

1.24

2700

004.

166

0.26

0.13

730.

0052

0.16

380.

0025

10.7

060.

088

0.47

220.

0096

0.74

1858

126

0092

2492

2624

97.2

7.7

2493

4299.8

GM

10-0

1a_2

0118

4.2

909

187.

24.

8640

0000

14.7

60.

970.

1122

0.00

420.

1257

90.

0018

6.08

90.

075

0.34

920.

0074

0.75

8608

521

5075

2038

2519

8711

1930

3597.1

GM

10-0

1a_2

0225

426

4.9

174.

21.

5280

0000

5.34

20.

340.

1677

0.00

630.

2232

0.00

3318

.28

0.15

0.59

110.

012

0.78

3008

831

3311

030

0223

3005

.17.

729

9348

99.6

GM

10-0

1a_2

0313

5.6

206

113.

91.

8118

0000

6.2

0.39

0.13

750.

0053

0.16

740.

0025

11.2

20.

110.

4849

0.00

990.

7242

1326

0394

2529

2625

40.9

9.2

2548

4310

0.3

GM

10-0

1a_2

0419

863

427

22.

3393

0000

10.1

60.

70.

0846

0.00

340.

1266

0.00

196.

266

0.06

80.

3573

0.00

720.

6827

228

1640

6320

4927

2012

.69.

519

6934

97.8

GM

10-0

1a_2

0672

.915

357

.72.

6512

0000

9.38

0.63

0.14

850.

0062

0.18

770.

0034

13.8

60.

230.

5349

0.01

20.

6051

167

2797

110

2718

3127

3816

2767

4910

1.1

GM

10-0

1a_2

0721

735

523

81.

4964

0000

5.00

60.

320.

1073

0.00

410.

1298

0.00

226.

701

0.08

60.

3745

0.00

840.

6609

666

2060

7420

9330

2072

1120

5039

98.9

GM

10-0

1a_2

0914

5.6

40.5

113.

90.

3616

000

1.26

90.

081

0.14

890.

0057

0.18

930.

0033

13.7

40.

160.

5253

0.01

10.

5540

467

2804

100

2735

3027

3412

2721

4799.5

Prim

ary

refe

renc

e m

ater

ial5

9150

0 (n

=34)

16.0

996

.51

34.3

62.

8112

5919

9.41

140.

722

0.05

423

0.00

310.

0748

40.

0022

21.

8572

0.04

650.

1796

50.

0042

40.

2558

8210

68.9

12.6

1056

.910

.710

63.9

3.2

1065

.45.

0

Seco

ndar

y re

fere

nce

mat

eria

l(s)5

FC1

(n=1

5)17

6.27

417.

6528

0.48

1.49

4904

754.

9564

0.33

20.

0397

60.

0015

60.

0670

10.

0013

41.

2713

0.01

920.

1283

80.

0027

60.

4430

287

1099

.810

.311

08.9

6.7

1094

.12.

110

82.5

5.4

R33

(n=1

3)34

.90

265.

2519

1.02

1.39

7528

04.

8899

0.35

0.02

132

0.00

093

0.05

586

0.00

143

0.51

850.

0112

0.06

735

0.00

146

0.30

2341

426.

55.

142

6.5

12.3

423.

22.

042

1.4

2.4

1 U–T

h–Pb

conc

entr

atio

ns re

fere

nced

to ei

ther

NIS

T 61

2 gl

ass o

r 915

00 zi

rcon

; con

cent

ratio

n un

cert

aint

y ap

prox

imat

ely

± 20

%.

2 Isot

ope r

atio

s not

corr

ecte

d fo

r com

mon

Pb.

3 Dat

es ca

lcul

ated

with

dec

ay co

nsta

nts o

f Jaf

fey

et a

l. (1

971)

and

238 U

/235 U

= 1

37.8

18 (H

iess

et a

l. 2

012)

usin

g Io

lite v

. 3.5

(Pat

on et

al.

201

1) a

nd U

–Pb

Geo

chro

n4 D

RS (P

aton

et a

l. 2

010)

.

Pre

ferr

ed d

ates

use

d in

plo

ts a

re 2

06/2

38 d

ates

less

than

700

Ma

and

207/

206

date

s gre

ater

than

700

Ma.

4 Disc

orda

nce c

alcu

late

d as

(1-(

206 Pb

/238 U

age

/ 20

7 Pb/23

5 U a

ge))

*100

.5 C

once

ntra

tion

data

are

mea

ns o

f all

anla

yses

; dat

es a

nd is

otop

e rat

ios a

re w

eigh

ted

mea

ns o

f all

anal

yses

<2%

disc

orda

nt

Ave

rage

repr

oduc

ibili

ty o

f ind

ivid

ual U

–Pb

date

s fro

m p

rimar

y re

fere

nce m

ater

ial i

s bet

ter t

han

0.7%

(red

uced

sepa

rate

ly a

s unk

now

ns) a

nd a

vera

ge a

ccur

acy

of se

cond

ary

refe

renc

e mat

eria

l is 1

.5%

or b

ette

r.±2σ2

206 Pb

/ 23

8 U±2σ2

%

con

208 Pb

/2

32Th

±2σ2

207 Pb

/2

06Pb

±2σ2

207 Pb

/ 23

5 U

207 Pb

/ 23

5 U±2σ2

206 Pb

/ 23

8 U±2σ2

Rho3

Mea

sure

d co

ncen

trat

ions

1Is

otop

ic ra

tios

Cal

cula

ted

age

s (M

a)

±2σ2

207 Pb

/ 20

6 Pb±2σ2

Ana

lysis

Id

entif

ier

Pb

(ppm

)U

(p

pm)

Th

(ppm

)U

/Th

206 Pb

/

204 Pb

208 Pb

/ 20

6 Pb±2σ2

208 Pb

/ 23

2 Th



Tabl

e A

3. U

–Pb

geoc

hron

olog

ic d

ata

for s

ampl

es B

L15-

01, N

B16-

356,

and

NB1

6-35

8 ru

n at

the U

nive

rsity

of N

ew B

runs

wic

k (a

naly

st D

eann

e van

Roo

yen)

.

NB1

6-35

6A a

nd N

B16-

356B

Lon

g Po

nd B

ay F

orm

atio

n (U

TM -

674

199E

, 494

7299

N; G

rid

Zone

19T

)17

4100

000

4.9

0.8

6.4

2014

7014

1697

.69

11.

843

0.08

80.

152

0.00

30.

070

0.08

890.

0040

1376

8210

5631

911

1764

.117

4000

000

8.9

2.7

3.3

470

429

140

87.2

93

1.72

00.

250

0.16

30.

004

0.68

60.

0754

0.00

8511

6019

099

399

971

2480

.610

6900

000

6.2

7.1

0.9

5818

3126

792

.97

11.

547

0.07

20.

097

0.00

20.

436

0.11

320.

0045

1849

6895

131

598

1262

.916

8300

000

5.0

3.9

1.3

122

2621

159

88.6

92

0.82

00.

340

0.09

60.

004

0.87

40.

0550

0.02

3014

8032

054

018

059

025

109.

317

5500

000

1.8

1.3

1.4

212

600

3288

97.3

71

1.01

00.

062

0.09

20.

002

0.01

70.

0796

0.00

4711

5012

070

132

565

1280

.617

8700

000

14.5

3.1

4.6

311

367

4523

398

.17

13.

375

0.08

40.

238

0.00

40.

699

0.10

330.

0013

1682

2314

9720

1376

2179

.618

8200

000

16.5

0.9

19.4

1117

155

7827

99.5

21

1.23

40.

037

0.13

00.

003

0.50

00.

0699

0.00

1591

945

816

1778

814

83.8

1651

0000

011

.80.

272

.671

2839

603

96.9

11

1.23

90.

060

0.10

50.

003

0.28

10.

0875

0.00

3613

6080

816

2764

315

78.8

1525

0000

015

.11.

015

.025

5011

04

4055

.47

31.

610

0.25

00.

122

0.00

40.

644

0.09

400.

0100

1460

200

946

100

739

2178

.116

9100

000

8.0

3.5

2.3

7323

3240

996

.10

11.

300

0.15

00.

102

0.00

20.

450

0.09

220.

0095

1370

190

824

6262

611

75.9

1737

0000

012

.10.

434

.137

142

1114

387

.20

30.

890

0.13

00.

102

0.00

20.

503

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644

6762

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83

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122

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8.3

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1354

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342

776

2354

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000

11.6

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497

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150

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092

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260.

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1470

3910

8519

898

1558

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20.6

0.9

23.4

399

359

257

92.7

43

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2754

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0.43

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1077

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1917

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5028

78.7

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52.

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330

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136

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618

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411

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60.

109

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361

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310.

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6867

119

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220

97.4

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106

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7165

617

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1098

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170

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30.

227

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380.

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000

13.0

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160

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50.

630

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660.

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120

956

3066

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0.38

00.

0654

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2676

287

689

2364

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94.0

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356B

-02

NB1

6-35

6B-0

3N

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356B

-04

NB1

6-35

6B-0

5N

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356B

-06

NB1

6-35

6B-0

8N

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356B

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6-35

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356B

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6-35

6B-1

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356B

-14

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6-35

6B-1

5N

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356B

-16

NB1

6-35

6B-1

7N

B16-

356B

-18

NB1

6-35

6B-1

9N

B16-

356B

-20

NB1

6-35

6B-2

1N

B16-

356B

-22

NB1

6-35

6B-2

3N

B16-

356B

-24

NB1

6-35

6B-2

5N

B16-

356B

-26

NB1

6-35

6B-2

7N

B16-

356B

-28

NB1

6-35

6B-2

9N

B16-

356B

-30

NB1

6-35

6B-3

1N

B16-

356B

-32

NB1

6-35

6B-3

3N

B16-

356B

-34

NB1

6-35

6B-3

5N

B16-

356B

-36

NB1

6-35

6B-3

7N

B16-

356B

-38

NB1

6-35

6B-3

9N

B16-

356B

-40

1399

0000

010

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011

.173

1521

573

96.9

31

1.37

20.

051

0.11

40.

002

0.37

50.

0856

0.00

2613

1659

875

2269

811

79.7

Sam

ple

90Zr

(cps

)U

(p

pm)

Th

(ppm

)%

co

n

Cal

cula

ted

ages

(Ma)

Isot

opic

ratio

sM

easu

red

conc

entr

atio

ns

207 Pb

/20

6 Pb±2

σ20

7 Pb/

235 U

±2σ

±2σ

206 Pb

/ 23

8 U

206 Pb

/ 23

8 U±2

σρ

207 Pb

/ 20

6 Pb±2

σTh

/UC

420

7 Pb/

235 U

±2σ

204 Pb

(c

ps)

±2σ

%

erro

r

206 Pb

/ 20

4 Pb2

%Pb

3



Tabl

e A

3. C

ontin

ued. 17

8800

000

2.4

1.0

2.5

2617

6576

398

.55

12.

840

0.13

00.

217

0.00

60.

594

0.09

610.

0032

1538

6113

6033

1267

2980

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000

3.2

3.0

1.1

150

2718

6674

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30.

310

0.54

00.

089

0.00

50.

892

0.01

500.

0400

1650

410

390

320

546

3114

0.0

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0000

010

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616

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915

575

2199

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70.

114

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370

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740.

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3673

513

694

1194

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000

4.2

3.3

1.3

6924

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11.

595

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60.

103

0.00

20.

144

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520.

0050

1865

8196

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629

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8000

000

14.2

1.9

7.4

970

130

1369

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03

0.93

00.

160

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40.

002

0.71

20.

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0.00

9512

2017

065

878

637

1196

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0.7

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281

269

135

87.3

63

1.16

00.

240

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90.

004

0.40

30.

0636

0.00

8411

2015

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312

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225

57.7

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1350

150

543

9357

713

106.

217

2600

000

5.6

2.5

2.2

412

300

6028

99.7

81

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90.

030

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40.

002

0.29

60.

0622

0.00

1566

752

687

1569

512

101.

118

0300

000

28.5

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3.1

9224

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057

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40.

105

0.00

20.

335

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360.

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4573

117

645

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23.5

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125.

221

2813

348

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107

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100

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799

7367

518

652

1296

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10.0

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7732

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212

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133

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0035

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1239

2468

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12.5

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215

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90.

155

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50.

250

0.10

560.

0045

1693

7611

8224

929

2651

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000

11.2

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12.8

1023

707

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31.

770

0.44

00.

138

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40.

740

0.08

900.

0150

1510

250

960

190

835

2351

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9600

000

16.9

6.7

2.5

116

1614

1334

96.7

33

3.26

00.

140

0.23

00.

004

0.66

00.

1041

0.00

2016

9336

1473

3113

3322

75.9

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087

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632

6020

06

7776

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688

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553

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531

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90.3

1758

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540

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97.9

61

1.29

40.

044

0.11

80.

002

0.26

40.

0799

0.00

2011

8250

841

2071

911

85.5

1684

0000

016

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85.

777

1418

861

97.9

81

1.17

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028

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90.

002

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0781

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4427

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710

84.8

1732

0000

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30.

191

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99.0

91

0.91

50.

028

0.09

90.

002

0.32

40.

0668

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1681

449

658

1561

110

92.8

1099

0000

015

4.1

110.

11.

4-7

11-1

57-5

113

99.7

61

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110

0.31

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70.

1067

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2417

3742

1764

1917

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9310

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431

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1048

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2517

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2015

7322

91.8

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52.0

412

300

9100

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31

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1766

758

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411

99.8

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353

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9.0

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51

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1246

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2520

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288

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430

150

586

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70.

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183

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1-9

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2011

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01

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1960

571

616

1461

811

100.

312

9100

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566.

686

2.0

0.7

9918

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00.

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190.

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920.

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800

180

595

5659

511

100.

010

6100

000

75.0

73.4

1.0

1011

110

1948

99.2

41

6.29

00.

170

0.36

340.

0063

0.48

20.

1268

0.00

3420

5046

2019

2619

9830

96.3

NB1

6-35

6B-4

1N

B16-

356B

-42

NB1

6-35

6B-4

3N

B16-

356B

-44

NB1

6-35

6B-4

5N

B16-

356B

-46

NB1

6-35

6B-4

7N

B16-

356B

-48

NB1

6-35

6B-4

9N

B16-

356B

-50

NB1

6-35

6B-5

1N

B16-

356B

-52

NB1

6-35

6B-5

3N

B16-

356B

-54

NB1

6-35

6B-5

5N

B16-

356B

-56

NB1

6-35

6B-5

7N

B16-

356B

-58

1058

0000

046

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589

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1136

713

3099

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11.

024

0.06

40.

1202

0.00

320.

140

0.06

180.

0040

590

130

705

3273

119

103.

7

206 Pb

/ 23

8 U±2

σ%

co

n±2

σ20

7 Pb/

206 Pb

±2σ

207 Pb

/ 23

5 U±2

σ±2

σ20

6 Pb/

238 U

±2σ

ρ20

7 Pb/

206 Pb

Mea

sure

d co

ncen

trat

ions

Isot

opic

ratio

sC

alcu

late

d ag

es (M

a)

Sam

ple

90Zr

(cps

)U

(p

pm)

Th

(ppm

)Th

/U20

4 Pb

(cps

)±2

σ%

er

ror

206 Pb

/ 20

4 Pb2

%Pb

3C

420

7 Pb/

235 U

NB1

6-35

6A-0

1N

B16-

356A

-02

NB1

6-35

6A-0

3N

B16-

356A

-04

NB1

6-35

6A-0

5N

B16-

356A

-06

NB1

6-35

6A-0

7N

B16-

356A

-08

NB1

6-35

6A-0

9N

B16-

356A

-10

NB1

6-35

6A-1

1N

B16-

356A

-12

NB1

6-35

6A-1

3N

B16-

356A

-14

NB1

6-35

6A-1

5N

B16-

356A

-16

NB1

6-35

6A-1

7N

B16-

356A

-18

NB1

6-35

6A-1

9N

B16-

356A

-20



Tabl

e A

3. C

ontin

ued.

1090

0000

076

.360

.21.

310

1212

057

699

.49

10.

876

0.04

50.

1029

0.00

220.

052

0.06

210.

0033

610

110

633

2463

113

99.7

8830

0000

433.

630

4.7

1.4

2718

6710

9098

.65

11.

019

0.03

60.

1042

0.00

190.

050

0.07

110.

0027

960

7471

617

639

1189

.210

8800

000

1097

.012

.091

.63

1240

030

620

99.8

91

0.99

10.

020

0.11

500.

0017

0.49

50.

0627

0.00

1269

542

699

1070

210

100.

490

1000

0045

2.0

18.5

24.4

1514

9325

1399

.34

11.

218

0.04

10.

1268

0.00

250.

283

0.06

960.

0024

900

7180

719

769

1485

.410

8300

000

100.

744

.42.

30

11n.

d.n.

d.99

.73

14.

051

0.11

00.

2989

0.00

520.

237

0.09

880.

0026

1591

5016

4122

1685

2693

.210

8900

000

58.8

32.4

1.8

-810

-131

-583

99.5

51

0.87

00.

050

0.10

140.

0023

0.25

90.

0626

0.00

3662

012

062

827

622

1399

.010

9400

000

304.

324

1.4

1.3

-12

12-1

00-1

899

99.6

11

0.85

10.

025

0.10

140.

0016

0.16

00.

0612

0.00

1862

664

624

1462

39

99.8

1103

0000

015

1.1

128.

71.

29

1112

212

6299

.56

10.

869

0.03

00.

1020

0.00

190.

255

0.06

220.

0022

652

7563

316

626

1198

.9

NB1

6-35

6A-2

1N

B16-

356A

-22

NB1

6-35

6A-2

3N

B16-

356A

-24

NB1

6-35

6A-2

5N

B16-

356A

-26

NB1

6-35

6A-2

7N

B16-

356A

-28

NB1

6-35

6A-2

910

8900

000

178.

212

9.2

1.4

-29

-541

-782

999

.29

10.

880

0.03

40.

0994

0.00

190.

060

0.06

430.

0025

730

8763

818

611

1195

.7N

B16-

356A

-29b

-110

9000

000

81.1

55.9

1.5

-12

12-1

00-5

3599

.83

10.

898

0.05

50.

1081

0.00

270.

435

0.06

050.

0033

550

110

642

2966

116

103.

011

0400

000

555.

110

.950

.967

1522

696

97.6

91

1.26

10.

044

0.11

240.

0017

0.39

60.

0813

0.00

2612

2565

825

1968

710

83.2

1258

0000

021

8.0

64.1

3.4

817

213

6163

99.1

51

4.25

00.

160

0.28

830.

0079

0.78

00.

1078

0.00

2917

5749

1681

3116

3239

91.5

1093

0000

014

91.0

8.4

176.

914

1179

8864

99.8

41

0.96

60.

019

0.11

210.

0016

0.41

10.

0628

0.00

1269

742

686

1068

510

99.8

1088

0000

096

.356

.01.

7-4

11-2

75-3

533

99.5

81

2.14

40.

077

0.20

080.

0037

0.30

70.

0779

0.00

2811

1770

1158

2511

7920

93.0

1087

0000

015

7.9

233.

00.

7-2

10-5

00-5

820

99.4

71

0.86

90.

031

0.10

200.

0018

0.02

40.

0624

0.00

2564

885

632

1762

611

99.0

1092

0000

032

5.3

93.9

3.5

89

115

4890

99.1

01

1.78

90.

046

0.16

440.

0029

0.61

10.

0792

0.00

1811

7648

1042

1798

116

81.9

1089

0000

015

3.8

80.8

1.9

194

2613

229

94.3

53

5.95

00.

410

0.36

620.

0053

0.57

40.

1168

0.00

7518

8012

019

2964

2011

2589

.210

7300

000

517.

011

0.5

4.7

8616

1952

897

.29

30.

961

0.11

00.

1173

0.00

240.

641

0.05

880.

0067

888

120

659

6471

514

108.

512

5100

000

778.

367

8.1

1.1

3914

3616

5498

.95

11.

027

0.02

70.

1065

0.00

190.

083

0.07

060.

0021

937

6071

714

652

1191

.010

7100

000

122.

911

6.4

1.1

011

n.d.

n.d.

99.8

61

0.88

30.

038

0.10

740.

0023

0.37

10.

0596

0.00

2454

889

638

2065

713

103.

093

4000

0025

1.7

121.

82.

1-1

312

-92

-360

599

.80

13.

585

0.09

60.

2737

0.00

510.

403

0.09

540.

0025

1530

4815

4521

1559

2697

.910

7500

000

139.

610

2.9

1.4

-15

11-7

3-1

434

99.7

01

2.36

30.

063

0.21

300.

0037

0.39

30.

0813

0.00

2212

1752

1229

1912

4420

97.9

1074

0000

041

4.9

611.

00.

740

1640

888

98.0

11

1.29

50.

047

0.11

830.

0019

0.40

20.

0797

0.00

2811

6567

840

2172

111

85.8

1056

0000

015

8.5

139.

51.

1-2

13-6

50-5

775

99.6

41

0.86

30.

036

0.10

300.

0019

0.29

00.

0615

0.00

2661

589

628

1963

211

100.

710

8600

000

79.5

30.8

2.6

-13

11-8

5-1

265

99.3

21

3.95

10.

110

0.28

280.

0052

0.27

20.

1021

0.00

2916

5153

1624

2216

0526

96.8

1212

0000

024

2.5

97.4

2.5

-312

-400

-141

4099

.55

12.

698

0.07

10.

2269

0.00

410.

343

0.08

700.

0023

1353

5213

2720

1318

2296

.710

8100

000

645.

030

.121

.46

1220

010

400

99.8

11

1.17

90.

026

0.13

150.

0020

0.30

40.

0654

0.00

1577

849

790

1279

612

97.6

NB1

6-35

6A-3

0N

B16-

356A

-31

NB1

6-35

6A-3

2N

B16-

356A

-33

NB1

6-35

6A-3

4N

B16-

356A

-35

NB1

6-35

6A-3

6N

B16-

356A

-37

NB1

6-35

6A-3

8N

B16-

356A

-39

NB1

6-35

6A-4

0N

B16-

356A

-41

NB1

6-35

6A-4

2N

B16-

356A

-43

NB1

6-35

6A-4

4N

B16-

356A

-45

NB1

6-35

6A-4

6N

B16-

356A

-47

1064

0000

075

.630

.82.

512

1192

943

99.3

61

2.28

80.

088

0.20

740.

0040

0.03

50.

0806

0.00

3211

7776

1202

2712

1421

95.4

NB1

6-35

6A-4

7b-1

1078

0000

015

4.4

23.7

6.5

111

1100

2256

099

.59

12.

183

0.06

20.

2006

0.00

320.

068

0.07

940.

0024

1164

6011

7320

1179

1798

.310

6800

000

519.

020

2.6

2.6

1100

110

1096

83.1

03

2.96

00.

180

0.23

330.

0043

0.63

50.

0903

0.00

5114

4195

1382

4813

5123

94.4

1077

0000

019

4.9

53.0

3.7

-410

-249

-470

899

.60

11.

159

0.03

50.

1297

0.00

230.

184

0.06

510.

0020

758

6577

916

786

1395

.610

8000

000

436.

211

0.6

3.9

111

1100

5990

099

.75

11.

990

0.07

30.

1876

0.00

520.

896

0.07

690.

0018

1110

4811

0625

1107

2899

.712

5400

000

269.

417

0.7

1.6

1015

150

6700

99.7

31

4.72

60.

120

0.31

660.

0061

0.51

10.

1088

0.00

2717

7645

1770

2217

7330

99.5

1088

0000

095

.248

.82.

07

1115

710

1199

.62

10.

841

0.04

40.

1010

0.00

190.

050

0.06

020.

0032

580

110

614

2562

011

101.

010

8100

000

122.

290

.71.

3-3

10-3

33-3

047

99.5

01

0.90

10.

038

0.10

470.

0020

0.37

40.

0629

0.00

2666

588

652

2164

212

98.4

1078

0000

040

1.1

90.5

4.4

810

128

7560

99.8

11

2.07

90.

047

0.19

520.

0033

0.42

40.

0773

0.00

1811

2843

1140

1611

4918

97.9

1068

0000

029

7.9

224.

51.

3-4

10-2

50-1

7500

99.7

01

5.03

40.

110

0.32

560.

0052

0.20

90.

1122

0.00

2318

3236

1824

1818

1725

99.2

8860

0000

877.

039

.422

.322

1673

3427

99.7

51

1.18

00.

037

0.13

000.

0022

0.28

00.

0653

0.00

2077

668

790

1779

115

97.2

NB1

6-35

6A-4

8N

B16-

356A

-49

NB1

6-35

6A-5

0N

B16-

356A

-51

NB1

6-35

6A-5

2N

B16-

356A

-53

NB1

6-35

6A-5

4N

B16-

356A

-55

NB1

6-35

6A-5

6N

B16-

356A

-57

1075

0000

013

5.2

78.7

1.7

711

157

7014

98.4

11

####

#0.

270

0.49

790.

0082

0.64

70.

1907

0.00

3827

4632

2687

2026

0435

94.1

%

con

±2σ

207 Pb

/ 23

5 U±2

σ20

6 Pb/

238 U

±2σ

±2σ

ρ20

7 Pb/

206 Pb

C4

207 Pb

/23

5 U±2

σ20

6 Pb/

238 U

Th/U

204 Pb

(c

ps)

±2σ

%

erro

r

206 Pb

/ 20

4 Pb2

Sam

ple

90Zr

(cps

)U

(p

pm)

Th

(ppm

)

Mea

sure

d co

ncen

trat

ions

Isot

opic

ratio

sC

alcu

late

d ag

es (M

a)

±2σ

207 Pb

/20

6 Pb%

Pb3



Tabl

e A

3. C

ontin

ued. 10

6300

000

134.

913

8.8

1.0

811

138

1259

99.8

61

0.85

00.

039

0.10

350.

0021

0.32

70.

0595

0.00

2654

294

620

2163

512

102.

412

1500

000

161.

087

.61.

8-9

14-1

56-1

500

99.4

91

0.95

50.

045

0.11

010.

0025

0.07

30.

0632

0.00

3267

011

067

823

673

1499

.312

9700

000

494.

013

.137

.716

2012

526

2599

.49

10.

964

0.03

70.

1089

0.00

210.

145

0.06

430.

0025

737

8668

419

666

1297

.490

1000

0024

4.3

189.

41.

321

1990

2781

99.6

51

5.88

00.

170

0.35

540.

0068

0.39

80.

1201

0.00

3419

5350

1957

2519

6032

99.4

1322

0000

067

8.0

14.5

46.8

522

440

1166

099

.69

10.

920

0.04

10.

1080

0.00

200.

052

0.06

110.

0030

661

8966

122

661

1210

0.0

1047

0000

011

8.1

111.

31.

18

1113

811

1499

.62

10.

940

0.04

30.

1082

0.00

190.

282

0.06

270.

0027

648

9566

822

662

1199

.212

3900

000

510.

028

.018

.239

961

1513

586

.00

31.

200

0.17

00.

1194

0.00

260.

592

0.07

080.

0094

1140

170

787

7572

715

92.4

1303

0000

076

1.0

45.3

16.8

2217

7731

8699

.23

11.

087

0.03

50.

1146

0.00

260.

455

0.06

870.

0020

886

6074

617

699

1593

.788

7000

0011

8.0

82.0

1.4

187

2312

140

90.4

03

4.12

00.

700

0.30

300.

0110

0.67

30.

0950

0.01

6015

9027

015

9015

017

0553

91.2

1069

0000

067

.042

.31.

64

1025

012

2599

.76

10.

837

0.04

60.

1016

0.00

230.

080

0.05

980.

0034

520

120

611

2662

413

102.

110

6800

000

167.

797

.11.

7-1

11-1

100

-346

0099

.67

13.

978

0.08

70.

2881

0.00

460.

306

0.09

950.

0022

1609

4216

2818

1632

2397

.410

9100

000

234.

623

4.3

1.0

-99

-109

-221

499

.67

10.

931

0.03

10.

1106

0.00

210.

441

0.06

080.

0019

609

6866

616

676

1210

1.5

1076

0000

031

7.7

338.

70.

90

10n.

d.n.

d.99

.65

10.

861

0.02

30.

1021

0.00

160.

276

0.06

110.

0017

636

6163

213

627

1099

.210

6200

000

86.0

30.0

2.9

1210

8318

3598

.87

16.

510

0.17

00.

3599

0.00

670.

532

0.13

050.

0033

2097

4420

4323

1981

3294

.510

3900

000

60.6

38.6

1.6

1310

7734

999

.15

10.

975

0.05

30.

1075

0.00

250.

137

0.06

620.

0038

730

120

688

2865

815

95.6

1134

0000

064

.574

.30.

9-2

15-7

50-2

510

99.3

51

0.93

40.

069

0.10

770.

0039

0.18

90.

0632

0.00

4964

016

066

436

659

2399

.210

4900

000

205.

659

.73.

45

1224

038

4499

.51

11.

233

0.04

30.

1319

0.00

240.

525

0.06

710.

0020

839

6881

219

798

1496

.011

1900

000

227.

728

1.0

0.8

2513

5267

998

.71

10.

968

0.04

30.

1010

0.00

180.

025

0.06

940.

0032

869

9568

422

620

1090

.691

8000

0014

2.5

155.

30.

912

1210

081

099

.24

10.

896

0.04

50.

1029

0.00

240.

111

0.06

380.

0037

680

120

646

2463

114

97.7

1096

0000

011

3.5

93.4

1.2

310

333

2970

99.5

91

0.91

60.

042

0.10

670.

0023

0.34

30.

0620

0.00

2762

693

655

2265

313

99.7

9340

0000

222.

062

.03.

64

1537

511

850

97.8

91

5.44

00.

210

0.31

360.

0081

0.83

50.

1252

0.00

3120

2844

1887

3317

5740

85.4

1293

0000

079

4.0

8.4

94.5

248

7229

294

93.8

02

0.98

00.

130

0.11

040.

0019

0.43

80.

0655

0.00

6888

015

069

756

675

1196

.910

6000

000

255.

011

5.2

2.2

813

163

7185

99.9

21

4.65

60.

099

0.31

710.

0048

0.40

30.

1060

0.00

2317

2839

1758

1817

7523

96.2

1274

0000

023

2.6

141.

91.

6-1

420

-143

-120

499

.73

10.

760

0.04

10.

0930

0.00

200.

177

0.05

930.

0033

550

120

572

2457

312

100.

2

NB1

6-35

6A-5

8N

B16-

356A

-59

NB1

6-35

6A-6

0N

B16-

356A

-60a

NB1

6-35

6A-6

1N

B16-

356A

-62

NB1

6-35

6A-6

3N

B16-

356A

-64

NB1

6-35

6A-6

5N

B16-

356A

-66

NB1

6-35

6A-6

7N

B16-

356A

-68

NB1

6-35

6A-6

9N

B16-

356A

-70

NB1

6-35

6A-7

1N

B16-

356A

-72

NB1

6-35

6A-7

3N

B16-

356A

-74

NB1

6-35

6A-7

5N

B16-

356A

-76

NB1

6-35

6A-7

7N

B16-

356A

-78

NB1

6-35

6A-7

9N

B16-

356A

-80

NB1

6-35

6A-8

110

5400

000

675.

050

.613

.341

1332

1505

99.1

31

1.29

90.

030

0.13

030.

0020

0.30

70.

0718

0.00

1797

948

844

1378

911

80.1

NB1

6-35

6A-8

1b-1

1048

0000

014

3.2

39.7

3.6

012

n.d.

n.d.

99.6

81

2.45

30.

064

0.21

850.

0037

0.30

80.

0812

0.00

2112

1452

1256

1912

7419

93.6

1092

0000

013

1.7

73.1

1.8

-711

-157

-137

699

.58

10.

835

0.03

30.

0999

0.00

190.

177

0.06

040.

0024

578

8661

318

614

1110

0.1

8970

0000

197.

418

7.0

1.1

-415

-375

-323

399

.25

10.

898

0.04

30.

1014

0.00

250.

306

0.06

400.

0030

711

100

648

2362

215

96.0

NB1

6-35

6A-8

2N

B16-

356A

-83

NB1

6-35

6A-8

410

4300

000

54.6

41.3

1.3

-11

10-9

3-3

5999

.32

10.

885

0.05

80.

1007

0.00

230.

197

0.06

360.

0042

630

130

634

3161

814

97.5

NB1

6-35

6A-8

4b-1

1172

0000

063

.255

.21.

115

1493

329

99.6

51

0.87

40.

060

0.10

490.

0031

0.03

90.

0607

0.00

4755

016

063

233

643

1810

1.7

NB1

6-35

8A R

oss I

slan

d Fo

rmat

ion

(UTM

- 6

8061

9E, 4

9441

50N

; Gri

d Zo

ne 1

9T)

1839

0000

068

8.8

740.

00.

98

1113

824

225

99.8

51

4.52

10.

130.

3079

0.01

20.

823

0.10

620.

0008

1734

1417

3324

1730

5899

.917

3700

000

75.3

46.9

1.6

3.1

9.3

300

2132

99.6

81

0.81

20.

050.

0975

0.00

40.

055

0.06

060.

0037

550

120

598

2960

023

100.

317

1500

000

227.

819

3.3

1.2

1414

100

1694

99.7

41

1.00

60.

040.

1154

0.00

50.

398

0.06

320.

0019

700

6370

521

704.

126

99.9

1659

0000

090

.327

.33.

36

1220

027

0899

.68

12.

240.

110.

2064

0.00

80.

494

0.07

870.

003

1158

7011

8835

1209

4594

.717

9700

000

228.

921

1.9

1.1

15.8

9.6

6112

9999

.65

10.

823

0.03

0.09

870.

004

0.21

30.

0605

0.00

1760

258

608

1760

6.6

2299

.816

2900

000

198.

223

0.6

0.9

211

550

8480

99.7

61

0.77

80.

030.

0969

0.00

40.

306

0.05

830.

0018

524

7058

319

596.

322

102.

3

NB1

6-35

8A-0

1N

B16-

358A

-02

NB1

6-35

8A-0

3N

B16-

358A

-04

NB1

6-35

8A-0

5N

B16-

358A

-06

NB1

6-35

8A-0

719

3000

000

409.

88.

150

.77

1318

659

0199

.72

10.

898

0.03

0.10

60.

004

0.40

40.

0617

0.00

1465

349

650

1764

9.5

2399

.9

±2σ

206 Pb

/ 23

8 U±2

σ%

co

n

207 Pb

/ 20

6 Pb±2

σ20

7 Pb/

206 Pb

±2σ

207 Pb

/ 23

5 U

207 Pb

/23

5 U±2

σ20

6 Pb/

238 U

±2σ

ρ

Mea

sure

d co

ncen

trat

ions

Isot

opic

ratio

sC

alcu

late

d ag

es (M

a)

Sam

ple

90Zr

(cps

)U

(p

pm)

Th

(ppm

)Th

/U20

4 Pb

(cps

)±2

σ%

er

ror

206 Pb

/ 20

4 Pb2

%Pb

3C

4



Tabl

e A

3. C

ontin

ued. 18

1000

000

456.

245

8.4

1.0

1311

8533

8599

.69

10.

891

0.03

0.10

430.

004

0.28

90.

0623

0.00

1467

351

646

1763

9.5

2399

.018

7500

000

730.

012

0.4

6.1

310

333

9133

399

.86

17.

750.

260.

4073

0.01

60.

944

0.13

840.

0013

2206

1621

9930

2202

7399

.616

2700

000

560.

028

8.0

1.9

312

400

3410

099

.96

12.

302

0.07

0.21

220.

008

0.28

60.

0791

0.00

1211

7129

1212

2112

40.4

4293

.817

6800

000

214.

011

8.1

1.8

1213

108

1662

99.6

21

0.85

0.04

0.10

170.

004

0.23

10.

061

0.00

261

469

623

1962

4.5

2310

0.2

2131

0000

041

5.0

199.

52.

128

1864

4221

99.6

91

4.11

90.

130.

292

0.01

20.

591

0.10

290.

0017

1675

3016

5726

1651

5998

.018

7500

000

153.

212

3.1

1.2

2011

5569

599

.51

10.

786

0.04

0.09

460.

004

0.20

20.

0607

0.00

2259

781

589

1958

2.5

2198

.917

5000

000

366.

235

6.7

1.0

9.2

8.1

8812

576

99.7

91

5.83

40.

170.

3541

0.01

30.

699

0.12

010.

0011

1956

1619

5025

1954

6499

.518

0000

000

378.

540

2.5

0.9

1416

114

2100

99.5

51

0.67

80.

030.

0841

0.00

40.

468

0.05

940.

002

564

7252

918

521

2298

.517

8100

000

204.

817

0.7

1.2

-0.4

9.8

-245

0-9

3350

99.6

61

2.16

0.07

0.19

840.

008

0.40

30.

0793

0.00

1511

7037

1166

2311

6741

99.8

1951

0000

043

7.1

132.

23.

32

1365

066

500

98.9

11

5.15

90.

150.

3166

0.01

20.

793

0.11

880.

0008

1937

1318

45.4

2417

7359

89.9

1820

0000

022

5.5

278.

70.

87

1420

028

8399

.67

10.

789

0.04

0.09

520.

004

0.46

50.

0603

0.00

2159

675

589

2058

6.4

2299

.616

9900

000

658.

063

7.0

1.0

15.8

8.8

5635

9599

.72

10.

824

0.03

0.09

80.

004

0.35

30.

0615

0.00

165

334

610.

715

602.

422

98.6

1706

0000

018

3.6

297.

00.

616

1063

979

99.4

71

0.79

70.

030.

0935

0.00

40.

042

0.06

210.

0023

643

8059

320

576.

221

97.2

1586

0000

016

3.9

41.3

4.0

2514

5669

099

.53

11.

030.

050.

1167

0.00

50.

253

0.06

40.

0024

742

7471

724

711

2799

.217

9200

000

82.8

36.2

2.3

2.1

942

920

3699

.72

10.

409

0.03

0.05

390.

002

0.37

30.

0548

0.00

433

015

034

324

338.

413

98.7

1750

0000

068

.114

2.8

0.5

1010

100

596

99.5

51

0.79

0.06

0.09

320.

004

0.25

80.

0614

0.00

458

014

058

433

574.

522

98.4

1825

0000

034

8.4

136.

52.

64.

69.

119

827

893

99.6

11

6.96

80.

20.

3821

0.01

40.

699

0.13

20.

0012

2123

1521

0625

2086

6798

.3

NB1

6-35

8A-0

8N

B16-

358A

-09

NB1

6-35

8A-1

0N

B16-

358A

-11

NB1

6-35

8A-1

2N

B16-

358A

-13

NB1

6-35

8A-1

4N

B16-

358A

-15

NB1

6-35

8A-1

6N

B16-

358A

-17

NB1

6-35

8A-1

8N

B16-

358A

-19

NB1

6-35

8A-2

0N

B16-

358A

-21

NB1

6-35

8A-2

2N

B16-

358A

-23

NB1

6-35

8A-2

4N

B16-

358A

-25

1413

0000

012

9.2

72.8

1.8

1912

6331

293

.47

10.

807

0.06

0.05

590.

003

0.26

10.

1046

0.00

7516

7013

059

536

350.

416

58.9

BL15

-001

Bal

ls L

ake

Form

atio

n (U

TM -

266

288E

, 501

1710

N; G

rid

Zone

20T

)28

0200

000

481.

197

.80.

2-4

1127

5-9

108

99.7

51

0.46

70.

010.

0625

5E-0

40.

191

0.05

350.

0011

340

4738

8.6

739

13

100.

627

1500

000

305.

014

1.7

0.5

1012

120

6250

99.8

31

1.75

10.

020.

1725

0.00

10.

371

0.07

290.

0008

1008

2310

26.9

7.6

1025

.77.

199

.927

3100

000

256.

022

7.0

0.9

-713

186

-467

199

.70

10.

917

0.02

0.10

880.

001

0.30

50.

0611

0.00

1364

344

662

1066

5.4

6.5

100.

525

6800

000

61.3

50.3

0.8

-15

2114

0-9

8799

.49

12.

362

0.1

0.20

860.

004

0.22

50.

0825

0.00

3912

3192

1228

2912

2521

99.8

2892

0000

060

7.0

57.7

0.1

-21

1257

-233

899

.76

10.

499

0.01

0.06

516E

-04

0.22

60.

0553

0.00

1243

544

410.

86.

840

6.8

3.6

99.0

2756

0000

056

7.2

375.

80.

7-4

1127

5-1

1150

99.7

21

0.5

0.01

0.06

595E

-04

0.02

10.

0549

0.00

140

240

411.

45.

641

1.1

3.2

99.9

3056

0000

025

8.2

304.

91.

2-1

023

230

-206

899

.52

10.

508

0.03

0.06

578E

-04

0.16

80.

0557

0.00

2842

011

041

618

410.

34.

898

.625

8600

000

688.

022

2.2

0.3

215

750

2632

599

.76

10.

501

0.01

0.06

616E

-04

0.07

60.

055

0.00

141

144

412

6.2

412.

43.

310

0.1

2687

0000

035

8.1

121.

70.

3-1

517

113

-186

199

.61

10.

505

0.02

0.06

551E

-03

0.22

60.

0563

0.00

1645

362

414.

79.

840

8.9

5.7

98.6

3119

0000

010

54.6

20.2

0.0

121

2100

1496

0099

.90

10.

983

0.02

0.11

320.

002

0.66

10.

0627

0.00

0869

728

694.

88.

469

1.3

8.9

99.5

2824

0000

019

0.9

124.

60.

71

1818

0020

250

99.5

51

0.71

60.

020.

088

0.00

10.

116

0.05

90.

002

554

7154

914

543.

86.

499

.125

5800

000

145.

677

.40.

5-1

320

154

-219

599

.82

11.

676

0.06

0.16

930.

002

0.18

50.

072

0.00

2299

158

1002

2010

0813

100.

624

8200

000

255.

612

2.9

0.5

-15

1812

0-4

373

99.8

21

2.65

20.

050.

2251

0.00

20.

224

0.08

50.

0016

1311

3513

1414

1309

1299

.627

2600

000

275.

910

3.1

0.4

-10

1313

0-8

130

99.8

31

3.06

10.

030.

2463

0.00

20.

262

0.08

980.

001

1422

2114

23.1

8.2

1419

1199

.728

1500

000

303.

727

3.0

0.9

1113

118

2285

99.6

61

0.52

60.

010.

0683

7E-0

40.

081

0.05

580.

0013

429

5242

8.8

7.9

426

4.2

99.3

2755

0000

092

.342

.00.

518

2011

156

399

.75

20.

720.

020.

0904

0.00

20.

764

0.05

790.

0006

525

2355

08.

755

7.9

1010

1.4

2447

0000

012

2.0

99.0

0.8

1122

200

834

99.7

71

0.50

80.

030.

0659

0.00

10.

179

0.05

540.

0036

390

140

415

2241

1.5

8.8

99.2

2506

0000

021

4.4

166.

90.

8-1

416

114

-182

399

.64

10.

888

0.02

0.10

510.

001

0.00

30.

0611

0.00

1864

864

646

1364

46.

999

.7

BL15

-01-

001

BL15

-01-

002

BL15

-01-

003

BL15

-01-

004

BL15

-01-

005

BL15

-01-

006

BL15

-01-

007

BL15

-01-

008

BL15

-01-

009

BL15

-01-

010

BL15

-01-

011

BL15

-01-

012

BL15

-01-

013

BL15

-01-

014

BL15

-01-

015

BL15

-01-

016

BL15

-01-

017

BL15

-01-

018

BL15

-01-

019

2722

0000

030

6.8

90.5

0.3

-212

600

-304

8099

.79

11.

696

0.02

0.16

80.

001

0.22

10.

0728

0.00

110

0628

1007

.28.

510

01.2

7.6

99.4

%

con

±2σ

207 Pb

/ 23

5 U±2

σ20

6 Pb/

238 U

±2σ

±2σ

ρ20

7 Pb/

206 Pb

%Pb

3C

420

7 Pb/

235 U

±2σ

206 Pb

/23

8 UTh

/U20

4 Pb

(cps

)±2

σ%

er

ror

206 Pb

/ 20

4 Pb2

Sam

ple

90Zr

(cps

)U

(p

pm)

Th

(ppm

)

Mea

sure

d co

ncen

trat

ions

Isot

opic

ratio

sC

alcu

late

d ag

es (M

a)

±2σ

207 Pb

/20

6 Pb



Tabl

e A

3. C

ontin

ued. 2698

0000

011

0.1

29.6

0.3

513

260

5160

97.2

11

3.59

00.

410

0.21

80.

019

0.98

40.

1106

0.00

5117

6890

1420

110

1250

100

88.0

2870

0000

061

0.7

428.

00.

74

1640

014

010

99.8

41

0.59

40.

010.

0764

6E-0

40.

364

0.05

650.

001

468

3847

37.

147

4.3

3.6

100.

325

6600

000

37.3

16.2

0.4

-315

500

-245

399

.54

11.

701

0.09

0.16

880.

003

0.39

40.

0729

0.00

3510

0990

1009

3210

0517

99.6

2601

0000

052

2.0

289.

40.

611

1513

635

4399

.74

10.

490.

010.

0646

6E-0

40.

176

0.05

510.

0011

405

4740

4.6

6.8

403.

33.

899

.727

7500

000

183.

910

1.3

0.6

611

183

3205

99.5

11

0.71

70.

020.

0885

0.00

10.

129

0.05

880.

0017

567

6455

012

547.

36.

499

.526

5600

000

376.

515

5.9

0.4

1121

191

2682

99.6

71

0.50

70.

010.

0666

8E-0

40.

026

0.05

550.

0015

418

6141

7.4

7.9

415.

44.

899

.528

2800

000

300.

056

.50.

211

1210

933

8299

.54

10.

899

0.02

0.10

270.

001

0.43

0.06

340.

0013

725

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697

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282.

683

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31

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320.

110

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0.80

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90.7

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504

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603.

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231.

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4.2

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435

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93

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441

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0543

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2337

089

370

1236

9.2

5.5

99.8

±2σ

206 Pb

/ 23

8 U±2

σ%

co

n

207 Pb

/ 20

6 Pb±2

σ20

7 Pb/

206 Pb

±2σ

207 Pb

/ 23

5 U

207 Pb

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σ20

6 Pb/

238 U

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ρ

Mea

sure

d co

ncen

trat

ions

Isot

opic

ratio

sC

alcu

late

d ag

es (M

a)

Sam

ple

90Zr

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(p

pm)

Th

(ppm

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)±2

σ%

er

ror

206 Pb

/ 20

4 Pb2

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3C

4



Tabl

e A

3. C

ontin

ued. 28

1600

000

409.

326

1.9

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108

2411

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41

0.50

80.

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770.

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526

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694

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265

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470.

0009

394

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13.

699

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1000

000

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002

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029

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383

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002

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480

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612

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260

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1659

97.

610

0.0

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013

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217

1376

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42

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0.05

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411.

24.

399

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618

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216

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212

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112

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220

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254

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627

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322

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467

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560

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84.

510

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466

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611

1961

2.5

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100.

226

9200

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5436

98.8

51

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1991

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115

1500

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99.5

81

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106

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150

555

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515

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028

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198.

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23

1343

349

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10.

476

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0.06

317E

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0.18

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0552

0.00

1739

467

395

1039

4.6

4.4

99.9

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394

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4.9

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99.6

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0000

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176.

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18

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516

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10.

491

0.02

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468E

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0551

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1939

570

406

1140

3.5

4.8

99.4

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0000

037

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00.

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109

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10.

513

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20.

0561

0.00

1845

370

420

1041

8.7

4.1

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526

602

1199

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312

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291.

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24

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487

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461

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395.

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000

97.1

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0.6

821

263

1136

99.5

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2966

0000

020

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1890

0-1

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01

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90.

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10.

013

0.05

890.

0023

541

8755

216

556.

77.

710

0.9

%

con

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207 Pb

/ 23

5 U±2

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6 Pb/

238 U

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±2σ

ρ20

7 Pb/

206 Pb

±2σ

207 Pb

/20

6 Pb%

Pb3

C4

207 Pb

/23

5 U±2

σ20

6 Pb/

238 U

Th/U

204 Pb

(c

ps)

±2σ

%

erro

r

206 Pb

/ 20

4 Pb2

Sam

ple

90Zr

(cps

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(p

pm)

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(ppm

)

Mea

sure

d co

ncen

trat

ions

Isot

opic

ratio

sC

alcu

late

d ag

es (M

a)



Tabl

e A

3. C

ontin

ued. 27

8300

000

210.

510

1.9

0.5

914

156

1773

99.6

71

0.5

0.01

0.06

548E

-04

0.35

60.

056

0.00

1543

763

412

1040

8.5

4.6

99.2

2796

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029

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70.

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0-1

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01

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560.

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424

6040

3.5

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226

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000

222.

110

0.8

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198

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2747

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2.6

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0.5

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099

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311

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54.

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000

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511

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244.

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2689

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196

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000

173.

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or: 1

= t

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or n

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thr

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for 20

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resh

old

% fo

r 208 Pb

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5 %

radi

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b)

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206 Pb

/ 23

8 U±2

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co

n

207 Pb

/ 20

6 Pb±2

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7 Pb/

206 Pb

±2σ

207 Pb

/ 23

5 U

207 Pb

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5 U±2

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6 Pb/

238 U

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ρ

Mea

sure

d co

ncen

trat

ions

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ratio

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late

d ag

es (M

a)

206 Pb

/ 20

4 Pb2

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3C

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mpl

e90

Zr (c

ps)

U

(ppm

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(p

pm)

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Sam

ple

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ror

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Isot

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Tabl

e A

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ued.

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FC-1

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FC-1

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57.9

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295

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0.5

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%

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6 Pb

Mea

sure

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ions

Isot

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ratio

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es (M

a)

Sam

ple

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σ%

erro

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206 Pb

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σ



Tabl

e A

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ontin

ued.

Ples

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297

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opic

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ror

detrital zircon signatures in precambrian and paleozoic

Documents