the upper cretaceous section at schmilka in saxony ......das oberkreide‑profil bei schmilka in...
TRANSCRIPT
59: 101 – 130
12 Sept 2013
© Senckenberg Gesellschaft für Naturforschung, 2013.
101ISBN 978-3-910006-37-9 | ISSN 1617-8467
The Upper Cretaceous section at Schmilka in Saxony (Elbsandsteingebirge, Germany) – syntectonic sedimentation and inverted zircon age populations revealed by LA‑ICP‑MS U/Pb data
Das Oberkreide‑Profil bei Schmilka in Sachsen (Elbsandsteingebirge, Deutschland) – syntektonische Sedimentation und inverse Zirkon‑Alterspopulationen offengelegt durch LA‑ICP‑MS U/Pb‑Daten
Mandy Hofmann 1, Ulf Linnemann 1 and Thomas Voigt 2
1 Senckenberg Naturhistorische Sammlungen Dresden, Museum für Mineralogie und Geologie, Sektion Geochronologie, Königsbrücker Landstraße 159, 01109 Dresden, Germany; [email protected] — 2 Friedrich-Schiller-Universität Jena, Institut für Geowissenschaften, Burgweg 11, 07749 Jena, Germany
Revision accepted 19 June 2013. Published online at www.senckenberg.de/geologica-saxonica on 10 September 2013.
AbstractMesozoic sediments in Saxony are represented by few limited occurrences of Lower Triassic and Middle to Upper Jurassic deposits but mainly by Upper Cretaceous predominantly clastic units filling the Elbe Zone (Pietzsch 1963, Voigt & Tröger in Niebuhr et al. 2007, Tröger in Pälchen & Walter 2008). The latter ones are confined by the Lausitz Block (part of the West-Sudetic Island) in the NE and the Erzgebirge (part of the Mid-European island) in the SW. The Upper Cretaceous sedimentation in the area of the Elbsandsteingebirge starts with the Upper Cenomanian marine transgression. Sediments of the Elbsandsteingebirge were deposited in marine environment in a narrow strait connecting northern cold Boreal water of N – NW Europe with the Tethyan warm-water areas in the S. The West-Sudetic Island (Lausitz-Krkonosze High) was the most possible source area for the Upper Cretaceous sediments of the Elbe Zone (Voigt 1994, Wilmsen 2011). Composition of sandstones and conglomerates indicate erosion and redeposition of older sediments which covered initially the basement of the Lausitz. We analysed six samples representing a 400 m thick sandstone succession (Schmilka, Postelwitz and Schrammstein formations) of Early Turonian to Early Coniacian age from the area around Schmilka (Elbsandsteingebirge) regarding their U/Pb-ages of detrital zircon grains. A significant change in the age spectra occurs from the Upper Turonian to the Lower Coniacian. We found a sudden input of Meso- and Palaeoproterozoic ages in the uppermost part of the Schmilka section that represent typical Baltica ages. As the whole region of north-ern Germany was covered by marine Cretaceous sediments, a direct input from Baltica (Scandinavia?) is impossible. Facies distribution and recent investigations suggest that during Middle Jurassic a major part of sandstones derived from uplifted parts of Paleoproterozoic and Mesoproterozoic units of Baltica. Therefore, we interpret the presented Coniacian age spectra as a signal of redeposited Middle Jurassic sandstones. Erosion of Jurassic sediments started not earlier than Early Coniacian (higher Schrammstein Formation, Sandstone e). The limited amount of ca. 540 Ma ages and predominance of variscan ages in all samples confirm covering of the Cadomian basement units of the Lausitz Block by Mesozoic sediments, originally derived from the Bohemian massif during the first depositional cycle. The basement rocks of the Lausitz Block were not available for erosion until at least Middle to Late Coniacian time. Further, our data confirm the inversion of the Lausitz Block relative to the Elbe Zone during Late Cretaceous time as already proposed by Voigt (1994).
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1. Introduction and geological setting
Apart from some scattered occurrences of Lower Triassic in some shallow synclines and Zechstein to Upper Ju-rassic at the margins of the Lausitz Block, Upper Cre-taceous sediments represent the major part of Mesozoic deposits in Saxony. They are mainly restricted to the Elbe Zone and represent the subsidence axis of the extended Bohemian Cretaceous basin which covers the Bohemian Massif in the Czech Republik. In the Elbsandsteinge-birge sediments range from the Middle Cenomanian to the Lower Coniacian and were summarized as Elbtal Group. Thickness and facies distribution indicate syntec-tonic deposition in the front of an uplifting source area (Pietzsch 1963, Voigt 1994, Tröger in Pälchen & Walter 2008).
1.1. Mesozoic sedimentation in Saxony
Jurassic and Triassic sediments are only known from very few localities, but these scattered remnants support the assumption that there had been a Triassic as well as a Jurassic cover on the pre-Mesozoic basement of Saxony (e.g. Tröger in Pälchen & Walter 2008). Triassic sedi-ments show the same characteristics as the very uniform basin-fill of the Triassic Germanic Basin. The lower Tri-assic time is characterized by continental red beds (Bunt-sandstein). Sediments are only known from drill holes
in northeastern Saxony (Spremberg-Weißwasser, Lausitz Block) and from some occurrences in western (Zeitz-Schmölln Syncline) and northern (Mügeln and Düben-Mühlberg Syncline) Saxony (Pietzsch 1963, Friebe in Pälchen & Walter 2008). Additionally, Lower Triassic sandstones of limited thickness are exposed in the central part of the Elbezone around Meißen. Jurassic sediments in Saxony are even rarer than the Triassic ones and only known from some occurrences along the Lausitz Thrust (Tröger in Pälchen & Walter 2008), where they underlie Upper Cretaceous deposits and got incorporated into the partly overturned sediments along the thrust (Fig. 1). Sedimentation started in the Middle to Late Jurassic, as at this time the marine transgression reached the area of today’s Saxony. A general fining trend is observed in the sedimentary record, forming a succession that grades from sand- into silt- and limestones (according to Cotta 1838 in Pietzsch 1963: 360). Earlier investigations pro-posed a narrow sea strait in the Elbezone but pelagic limestones and marls point to an extended shallow basin at least during Late Jurassic. The Late Jurassic to Early Cretaceous time is char-acterized by widespread and extensive erosion. This lead to general subsidence and is assumed to explain the transgression of Cenomanian deposits on the meta-morphic basement of the Erzgebirge and the Elbe Zone (Tröger in Pälchen & Walter 2008). A first transgression happened during the Early Cenomanian (Meißen Forma-
KurzfassungMesozoische Sedimente sind in Sachsen durch wenige vereinzelte Vorkommen der unteren Trias und des mittleren bis oberen Jura in der Umrandung des Lausitzer Massivs vertreten. Den Hauptanteil bilden aber die oberkretazischen vorwiegend klastischen Einheiten, welche in der Elbtal-Gruppe zusammengefasst sind und das Elbtal ausfüllen (Pietzsch 1963, Voigt & Tröger in Niebuhr et al. 2007, Tröger in Päl-chen & Walter 2008). Diese werden im NE durch den Lausitz-Block (als Teil der Westsudetische Insel) und im SW durch das Erzgebirge (als Teil der Mitteleuropäischen Insel) begrenzt. Die oberkretazische Sedimentation im Elbsandsteingebirge beginnt mit der obercenoma-nen Transgression. Die hier diskutierten Sandsteine wurden in einem engen Meeresarm abgelagert, welcher das kältere boreale Nordmeer mit der südlichen wärmeren Tethys verband (Wilmsen et al. 2011). Die Westsudetische Insel (Lausitz-Riesengebirge Block) stellt das Hauptliefergebiet für die oberkretazischen Sedimente der Elbezone dar (Voigt 1994, Wilmsen 2011). Die Zusammensetzung der Sandsteine und Konglomerate legt nahe, dass der Lausitz-Block als ein Teil der Westsudetischen Insel mit Sedimenten bedeckt war, welche während der Oberkreide erodiert wurden. Wir analysierten sechs Sandsteinproben aus dem Gebiet um Schmilka (Elbsandsteingebirge) hinsichtlich ihrer U/Pb-Alter detritischer Zirkone. Die etwa 400 m mächtige Abfolge (Schmilka-, Postelwitz- und Schrammstein-Formation) repräsentiert das Untere Turon bis Untere Coniac. Es gibt eine auffällige Veränderung der Alterssprektren vom späten Turon bis ins frühe Coniac. Wir fanden einen plötzli-chen Eintrag meso- und paläoproterozoischer Alter im obersten Niveau der Schmilka-Sandsteinabfolge. Diese Alter sind typisch für eine Baltika-Herkunft. Da aber ganz Norddeutschland während der Oberkreide von Meer bedeckt war, ist eine direkte Lieferung von Baltica (Skandinavien) ausgeschlossen. Die Faziesverteilung und neueste Provenienzstudien indizieren, dass während des Mittleren Jura ein großer Teil der Sandsteine aus gehobenen Einheiten Baltikas herzuleiten ist. Deshalb interpretieren wir das Altersspektrum als Wiederaufarbeitung jurassischer Sandsteine. Die Erosion dieser Jura-Sedimente auf dem Lausitz-Block begann erst im Unterconiac (höhere Schrammstein-Formation, Sandstein e). Die geringen Mengen an 540 Ma alten Zirkonen in allen Proben und die Vorherrschaft von variszischen Altern, die für das Böhmische Massiv typisch sind, bestätigen, dass das cadomische Grundgebirge des Lausitz-Blocks von Sedimenten bedeckt war, die im ersten Ablagerungszyklus vom Böhmischen Massiv geliefert wurden. Die Grundgebirgseinheiten standen nicht vor dem unteren Coniac (vermutlich erst später) an der Oberfläche an. Die Untersuchungen bestätigen die Inversion des Lausitzer Massivs in der späten Oberkreide (Voigt 1994).
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tion), but did not reach the area of the Elbsandsteinge-birge. After a fluvial phase a new transgression during the Late Cenomanian strongly influenced the whole area including all sediments of the Elbe Zone (Voigt & Tröger in Niebuhr et al. 2007). Therefore, sediment accumula-tion and subsidence in the Elbezone started not before Cenomanian. The Upper Cretaceous sediments in the surroundings of the Lausitz Block are mainly restricted to the north-ern margin of the Lausitz and the Elbe Zone but covered also the eastern Erzgebirge (Tröger in Pälchen & Walter 2008). The Meißen Formation (marine) contains the old-est sediments of the Elbtal Group. The fluvial deposits of the Niederschöna Formation represent the chronologi-cal next unit, which is followed again by marine sedi-ments due to the Middle to Late Cenomanian transgres-sion. During this second transgression the sandstones of the Elbsandsteingebirge where deposited (Oberhäslich, Schmilka, Postelwitz, and Schrammstein formations). Sedimentation continued at least until the Santonian in the Bohemian Cretaceous, but these youngest deposits were not preserved in Saxony. Sedimentation occurred in a narrow sea strait con-necting the cold Boreal of N–NW Europe with the warm Tethyan areas in the S. This strait was confined by the Mid-European Island comprising the Bohemian Mas-sif in the SW and the West-Sudetic Island including the Lausitz Block in the NE (Tröger 1964, Wilmsen et al. 2011). Therefore, the Erzgebirge (Bohemian Massif, part of the Mid-European Island) and the Lausitz Block (part of the West-Sudetic Island) are likely source areas for the Cretaceous sediments in Saxony. Due to tectonic activity and the development of the Lausitz Thrust, the area be-tween these two islands evolved as an asymmetric basin (marginal trough) deepening towards the Lausitz Block (Voigt 1994). Thickness maps of the Upper Cenomanian sediments show first evidence of differential subsidence due to the tectonic activity. From Turonian time onwards, the sedimentation was clearly syn-tectonically controlled by the relative uplift of the Lausitz Block and enhanced subsidence in an axis running parallel to the recent Lausitz thrust (Voigt 1994). From the NW to the SE, the Saxon Cretaceous sedi-ments become more and more siliciclastic, changing from hemipelagic limestones and marly dominated units around Meißen and Dresden (NW) to massive sandstones in the Elbsandsteingebirge (SE). The Schmilka-Großer Winterberg section (Elbsand-steingebirge, for location see Fig. 2) represents the thick-est undisturbed succession, ranging from the Lower Tu-ronian Schmilka-Formation to the Upper-Turonian/Low-er Coniacian Schrammstein-Formation. The total thick-ness of the Upper Cretaceous in Saxony is in the order of 550 to 650 m (Tröger in Pälchen & Walter 2008) in the Elbsandsteingebirge and possibly 1000 m in the Zittauer Gebirge, where the Lower Coniacian is represented by thick sandstones of the Waltersdorf Formation. Further towards the SE, the sandstones pass over into the Upper Cretaceous of the Bohemian Basin (Czech Republic).
1.2. Schmilka section
The Schmilka – Großer Winterberg section is mainly char-acterised by thick marine sandstone packages compris ing a complete 400 m thick succession of the Lower to Mid-dle Turonian Schmilka Formation, the Middle to Upper Turonian Postelwitz-Formation and the Upper Turonian to Lower Coniacian Schrammstein For ma tion. The labiatus Sandstone marks the base of the section (Schmilka Formation). The overlying Postelwitz- and Schramm-stein formations can be further subdivided in distinct units which have member status: Sandstones a, b and c according to Lamprecht 1928, 1931 and 1934 are sum-marized as Postelwitz Formation (Prescher 1981), d and e as Schrammstein Formation (Voigt & Tröger 2007) at the top of the Großer Winterberg (Fig. 2 and 3).
2. Samples and methods
2.1. Samples
The completely exposed Schmilka – Großer Winterberg section forms the type locality of the lithostratigraphic subdivision of the Cretaceous in the Elbsandsteinge-birge. Sampling covered the whole succession within a vertical distance of about 30 to 70 meters between the sample points. These samples represent all Upper Creta-ceous sandstone units from the Schmilka-, Postelwitz-, and the Schrammstein formations (see Fig. 3). The sedi-ments are represented by fine- to coarse grained quartz sandstones with a relatively low content of feldspar in the Schmilka Formation and the Sandstones b and d, respectively; and a higher amount of feldspar in the Sand stone a and e. Heavy mineral spectra are mainly dominated by tourmaline, zircon, and rutile. In total six sandstone samples were analysed regarding their zircon U/Pb ages. The sample localities for the sandstones used for zircon dating are marked in figures 2 and 3. Sample coordinates are given in table 1.
2.2. Methods
Zircon concentrates were separated from 1–3 kg sample material at the Senckenberg Naturhistorische Samm lun-gen Dresden. After crushing the rocks in a jaw crusher, the material was sieved and washed. The heavy mineral separation was realized by using heavy liquid LST (sodi-um heteropolytungstates in water) and a Frantz magnetic separator. Final selection of the zircon grains for U/Pb
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dating was achieved by hand-picking under a binocular microscope. Zircon grains of all grain sizes and morpho-logical types were selected, mounted in resin blocks and polished to half their thickness. The zircon grains where examined regarding their cathodoluminescence signal using an EVO 50 Zeiss Scanning Electron Microscope (Sen ckenberg Naturhistorische Sammlungen Dresden) prior to U/Pb analyses. This helps to distinguish differ-ent growth and maybe metamorphic zones within the single grains. For U/Pb analyses the laser spots where placed in zones with monophase growth patterns that show no metamorphic overprint. Zircons were analyzed for U, Th, and Pb isotopes by LA-SF ICP-MS techniques at the Senckenberg Naturhistorische Sammlungen Dres-den (Museum für Mineralogie und Geologie, GeoPlasma Lab), using a Thermo-Scientific Element 2 XR sector field ICP-MS coupled to a New Wave UP-193 Excimer Laser System. A teardrop-shaped, low volume laser cell constructed by Ben Jähne (Dresden, Germany) and Axel Gerdes (Frankfurt am Main, Germany) was used to en-able sequential sampling of heterogeneous grains (e.g. growth zones) during time resolved data acquisition. Each analysis consisted of 15 s background acquisition followed by 20 s data acquisition, using a laser spot-size of 20 to 25 µm, respectively. The signal was tuned for maximum sensitivity for 206Pb and 238U. A common-Pb correction based on the interference- and background-
corrected 204Pb signal and a model Pb composition (Sta-cey & Kramers 1975) was carried out if necessary. The necessity of the correction is judged on whether the cor-rected 207Pb/206Pb lies outside of the internal errors of the measured ratios. Discordant analyses were always inter-preted with care and discarded. The interference of 204Hg on mass 204 (Pb) was calculated by using a 204Hg/202Hg ratio of 0.2299 and measured 202Hg. Raw data were cor-rected for background signal, common Pb, laser induced elemental fractionation, instrumental mass discrimina-tion, and time-dependant elemental fractionation of Pb/Th and Pb/U using an Excel® spreadsheet program de-veloped by Axel Gerdes (Frankfurt am Main, Germany). Reported uncertainties were propagated by quadratic addition of the external repro ducibility obtained from the standard zircon GJ-1 (~0.6% and 0.5 – 1% for the 207Pb/206Pb and 206Pb/238U, respectively) during individual analytical sessions and the within-run precision of each analysis. Isoplot diagrams (1 σ error) were produced us-ing AgeDisplay (Sircombe 2004). The 207Pb/206Pb age
Fig. 2. Geological map of the study area (slightly modified from Lobst, 1993) showing the Upper Cretaceous sandstones that represent the Schmilka (labiatus Sandstone), the Pos-telwitz (Sandstones a – c) and the Schrammstein forma-tions (Sandstones d and e). Sample points are indicated.
Abb. 2. Die geologische Karte des Untersuchungsgebietes (leicht verändert nach Lobst 1993) zeigt die oberkretazischen Sandsteine der Schmilka- (labiatus-Sandstein), der Postel-witz- (Sandsteine a – c) und der Schrammstein-Formation (Sandsteine d und e). Die Probenahmepunkte sind ein ge-tragen.
Fig. 1. The cross-section of the Saxonian Cretaceous Basin shows the thrusting of the Lausitz Block on the Mesozoic depo-sits (based on Lobst 1993). The sediments are overthrust-ed. Important are the Jurassic deposits that are preserved along the fault. They are in general absent below the Cre-taceous deposits elsewhere in Saxony. Their occurrence and facies indicate a widespread Jurassic cover and the in-version of a Jurassic-Early Cretaceous graben which was established in the area of the recent Lausitz Block.
Abb. 1. Schnitt durch das sächsische Kreidebecken, der deutlich die Aufschiebung des Lausitz-Blocks auf die mesozoi-schen Sedimente des Elbtals zeigt. Die Sedimentschichten wurden dabei überkippt. Wichtig ist das Vorkommen ju-rassischer Sedimente im Liegenden der kreidezeitlichen Ablagerungen. Sie sind nur im Störungsvolumen erhalten geblieben und fehlen im Untergrund des Sächsischen Kreidebeckens. Ihre Existenz und ihre Ausbildung las-sen auf eine ehemals weite Verbreitung jurassischer Sedi-mente und die Inversion eines Grabens schließen, der ur-sprünglich auf dem Lausitzer Massiv angelegt und in der Oberkreide invertiert wurde.
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was taken for interpretation for all zircons >1.0 Ga, and the 206Pb/238U ages for younger grains. For further details on analytical protocol and data processing see Gerdes & Zeh (2006) and Frei & Gerdes (2009).
3. Results
The U/Pb zircon ages show very similar results for the first five samples (Sk 6-2, Sk 1s, Sk 5, Sk 4-1, 3-1) repre-senting the sandstone units labiatus Sandstone (Schmil-ka Formation), Sandstone a, b, c (Postelwitz Formation), and Sandstone d (Schrammstein Formation) (Fig. 3). The youngest concordant measurement for each sample is given in the AgeDisplay diagrams in Figure 3. For all samples, the age spectra start at ca. 300 to 330 Ma and go on more or less continuously until ca. 800 Ma. The youngest single zircon grain was found in sample Sk 5, giving an age of 258 ± 6 Ma (2 σ error). There are abun-dant (for samples Sk 6-2, Sk 1s, Sk 5, Sk 4-1, Sk 3-1) or many (sample Sk 2-2) Meso- and Palaeoproterozoic zir-con ages up to ca. 2000 to 2100 Ma. Archean ages were only found in the base of the section in sample Sk 6-2 (labiatus Sandstone, Schmilka Formation), represented by one zircon grain with an age of 2969 ± 76 Ma (2 σ error). There is only one more grain older than 2100 Ma found in sample Sk 4-1 (Sandstone c, Postelwitz Forma-tion) giving an age of 2441 ± 34 Ma (2 σ error, Fig. 3). The most important result is the striking difference in abundance and distribution of age spectra of the Meso- and Palaeoproterozoic zircon in sample Sk 2-2 (Sand-stone e, Schrammstein Formation) compared to all other samples. The increasing number of Proterozoic ages in the upper part of the section is associated with a decrease in Palaeozoic ages (Figs. 3 and 4).
4. Interpretation and discussion
The recent geology of the Lausitz Block is dominated by early Cambrian granodiorites which intruded Late Neo-proterozoic greywackes. The age spectra of these units are well known and represent the following ages: The sedimentation age of the greywackes is assumed to be ca. 570 Ma, given by youngest detrital zircon grains and ash layers. In addition to this, the greywackes contain few detrital zircon grains of Archean ages (up to 3.5 Ga) and abundant zircons of Palaeo- and Neoproterozoic/Cadomi-an ages. Important is the lack of detrital Mesoproterozoic zircon grains in these sediments. The intruding granodi-orites are summarized as Lausitz Granodio rite Suite and
show zircon ages of ca. 540 Ma. Only the Rumburg Gra-nite with ca. 490 Ma is younger. On top of these Cadomi-an units lie Lower Ordovician shallow marine sediments represented by the Dubrau Formation (Tremadoc, ca. 480 Ma; Linnemann 2008, Linnemann et al. 2011). The ages are different from observed ages of the Cretaceous sandstones in the Schmilka-Großer Winter-berg section. We did not find a prominent peak of ca. 540 Ma old zircon grains, as expected due to the direct neighbourhood to the 540 Ma old granodiorites of the Lausitz Block. Ages of this time were found in all sam-ples, but not with increased amounts relatively to other age groups. Nevertheless, this age group occurs both in the Variscan deformed basement of the Bohemian Massif as well as in the units of the Lausitz Block. Therefore, we conclude that these sandstones were derived from sedi-mentary units which covered the inverted Lausitz Block during the Cretaceous and were originally derived from the Bohemian Massif. We interpret the Neoproterozoic to Paleozoic ages of all samples as the influx of reworked units of the Avalo-nian/Armorican and Variscan basement units (Hofmann et al. 2009). The youngest concordant U/Pb zircon age of 258 ± 6 Ma (sample Sk 1s, sandstone a, Fig. 3) shows that there had been magmatic activity in the uppermost Permian, maybe representing the first break-up activities of Pangea and opening of Permian basins. —Zircons of Triassic, Jurassic and Cretaceous sandstones in Germany indicate a distinct change in source area of the Jurassic sediments compared to Triassic and Cretaceous sediments. Middle Jurassic sandstones (Dogger) show a distinct age peak in the Meso- and Paleoproterozoic ages (Hofmann et al. 2009). These ages are representative for a Baltica provenance (Hofmann et al. 2009) and correlate to the regional uplift of the North Sea Dome during the Middle Jurassic which resulted in the widespread erosion and resedimentation of Early Jurassic and Triassic sand-stones of the Northsea Basin which were originally shed from the Baltic shield. There is no potential source area providing big amounts of zircon ages between 900 and 1900 Ma in Cen-tral Europe. Therefore it is likely, that the high amount of Proterozoic ages in the uppermost sample (Sk 2-2, Sand-stone e, see Fig. 4) derived from eroded and reworked Ju-rassic siliciclastic sediments covering the Lausitz Block at that time. The samples Sk 6-2 to Sk 3-1 were taken below Sk 2-2 (Fig. 3) and do not show this massive in-put of Proterozoic ages. They prove that Middle Jurassic deposits where not at the surface at that time. Probably, they had still been covered by younger sediments (Upper Jurassic to Lower Cretaceous). The erosion of units with the Meso-/Proterozoic age spectra started in the Conia-cian. Therefore the basement units of the Lausitz Block were not at the surface and not available to erosion dur-ing Turonian – Coniacian time (Fig. 5).—Apatite cooling ages of the Lausitz Block (Lange et al. 2008) and of the Karkonosze Mts. (Danišik et al. 2010)
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prove an enormous Late Cretaceous uplift of the Lausitz Block ca. 50 to 85 Ma ago (Lange et al. 2008). Uplift and fast cooling happened in two stages also in the Karko-nosze Mts. at ca. 82 – 90 Ma and at 77 – 91 Ma (Danišik et al. 2010). This uplift resulted in the removal of about 3 – 4 km of overburden (estimated denudation rate of ca. 100 m/1 Ma for the Lausitz Block, Lange et al. 2008). On the base of pebble composition close to the Lausitz Thrust and these cooling ages, Voigt (2009) concluded that eroded units were initially represented by a thick sedimentary pile of Triassic to Early Cretaceous sedi-ments which were redeposited in an upside-down suc-cession (first youngest, last oldest). As the uppermost Cretaceous sandstones show no evidence of a granodi-oritic source and most cooling ages indicate a Santonian to Campanian uplift, a much thicker primary thickness of Cretaceous sediments can be assumed. Triassic sandstones were assumed as source for the higher parts of the Late Cretaceous succession in the Elbsandsteingebirge (Voigt 1994). But the predominance of Baltica ages (Meso-Palaeoproterozoic) in the high-
est preserved units indicates that they did not provide a significant amount of sands to the basin fill until the early Coniacian. We propose a later redeposition of Tri-assic sands. This is in agreement with cooling ages of the Lausitz Block (Lange et al. 2008) and the Karkonosze Mts. (Danišik et al. 2010) and the comparison with bet-ter preserved basins, proving a Santonian to Campanian peak of inversion tectonics. Unfortunately, there are no younger Upper Creta-ceous sediments than Lower Coniacian left in the study area. Because of that, we can only assume that the Tri-assic and Permian sediments, lying below the Jurassic deposits, got eroded later too, and, maybe, even a part of the granodiorite of the Lausitz Block itself, in the up-permost Cretaceous. These “evidences” where probably eroded during the big Late Cretaceous to Early Palaeo-gene weathering. Additionally, we assume regional uplift of the Lausitz and the Bohemian Massif after inversion, because most of the Cretaceous deposits of the Bohemian Cretaceous Basin had been removed before the Miocene.
Fig. 3. Section of the Elbsandsteingebirge around Schmilka (Großer Winterberg region) based on Lamprecht (1928), Tröger (in Pälchen & Walter 2008) and own field observations. One sample of each sandstone unit was analysed. Sample points are indicated. Age-Display diagrams of all samples showing concordant U/Pb zircon ages (x-axis) versus probability and frequency (y-axis) after Sircombe (2004) are based on 1 σ errors. All measurements with a degree of concordance between 90 and 110 % were regarded as concordant and used for the diagrams. 206Pb/238U-ratios were used for age calculation of all ages below 1000 Ma. For older grains 207Pb/206Pb-ratios were used for age calculation. Youngest concordant single zircon age of each sample is given with 2 σ error.
Abb. 3. Geologischer Schnitt durch das Elbsandsteingebirge bei Schmilka (Region Großer Winterberg) basierend auf Lamprecht (1928), Tröger (in Pälchen & Walter 2008) und eigenen Geländeaufnahmen. Pro Sandsteineinheit wurde eine Probe analysiert. Die Probenahmeniveaus sind durch weißen Sternchen markiert. Das AgeDisplay Diagramm jeder Probe zeigt die U/Pb-Zirkonalter (x-Achse) aufgetragen gegen die Wahrscheinlichkeit und Häufigkeit (y-Achse), basierend auf einem 1-σ-Fehler (Sircombe 2004). Alle Messungen mit einer Konkordanz zwischen 90 und 110% wurden als konkordant angesehen und zur Erstellung dieser Diagramme genutzt. Zur Altersberechnung für Alter unter 1000 Ma wurden die 206Pb/238U-Verhältnisse verwendet. Für höhere Alter wurde das 207Pb/206Pb-Verhältnis herangezogen. Das jüngste konkordante Einzelzirkonalter für jede Probe ist angegeben (2-σ-Feh ler).
Fig. 4. Diagrams showing change in age classes (Archean, Proterozoic and Palaeozoic) for all analysed sandstones. Note the sudden increase of Proteorzoic ages in the uppermost sample (Sk 2-2, Sandstone e, Schrammstein Formation) in comparison to the five samples below.
Abb. 4. Darstellung der Veränderung der Altersklassen für alle analysierten Sandsteine. Auffällig ist die plötzliche Zunahme proterozoi-scher Alter in der obersten Probe (Sk 2-2) im Vergleich zu den fünf darunterliegenden Proben.
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5. Summary
The main results of this study can be summarized in sev-en points:
The Lausitz Block was a part of the West-Sudetic Island and covered with Triassic, Jurassic and probably Lower Creataceous sediments. It was the most probable source area for the Upper Cretaceous sandstones of the Elbtal Group.—The determined zircon ages from the Palaeozoic to Late Neoproterozoic are interpreted as signals of reworked lo-cal material, such as the Variscan and Cadomian base-ment units and their Palaeozoic cover sequences.—The zircon U/Pb-age spectra show a sudden input of Meso- and Palaeoproterozoic ages in the uppermost part of the Schmilka section (sample Sk 2-2, Sandstone e, Fig. 3), that can only be interpreted as reworking of si-liciclastic Jurassic material (Middle Jurassic).—Erosion of these Jurassic sediments started not earlier than in the Coniacian (Fig. 5).—Most zircon grains represented in this study experienced at least their second cycle of recycling during the Late Cretaceous sedimentation.—The minor amounts of ca. 540 Ma ages in all samples confirm the Mesozoic cover of the Cadomian basement units of the Lausitz Block. The latter ones were not avail-
Fig. 5. Model of inversion and syntectonic redeposition of the Mesozoic cover of the Lausitz Block (based on Voigt 2009 and the recent study) showing sedimentation and tectonic activity along the Lausitz Thrust during the Mesozoic. Uplift of the Lausitz Block started in the low-er Upper Cretaceous (Middle Cenomanian). From that time on, the Mesozoic cover of the Lausitz Block was the main source area for the sediments of the Saxonian Cretaceous Basin. Erosion of Middle Jurassic siliciclas-tic sediments started in the Coniacian. Older (Triassic) sediments and early Cambrian granodiorites did prob-ably not contribute to the formation of Upper Cretaceous deposits in Saxony.
Abb. 5. Model zur Sedimentation und tektonischen Aktivität ent-lang der Lausitzer Überschiebung während des Mesozoi-kums (basierend auf Voigt 2009 und den Ergebnissen dieser Studie). Die Hebung des Lausitz-Blocks begann in der unteren Oberkreide (mittleres Cenoman). Die auflagernden mesozoischen Sedimente des invertierten Lau sitz-Blocks waren die Hauptquelle für die Sandsteine des Elbsandsteingebirges. Die Abtragung mitteljurassi-scher siliziklastischer Sedimente begann im Coniac. Äl-tere (triassische) Sedimente und der heute in der Lausitz dominierende Granodiorit trugen vermutlich nicht zur Sedimentbildung der sächsischen Oberkreide bei.
109
GEOLOGICA SAXONICA — 59: 2013
able for erosion until at least Middle to Late Coniacian times (most probably even later).—The presented section does not show a real inversion with Cadomian ages (mainly ca. 540 and ca. 570 Ma) of the Lausitz Block on top. According to cooling ages and compared with better preserved basins this inversion took place during the Santonian to Campanian, which is too young for the Schmilka – Großer Winterberg section.
6. Acknowledgement
We would particularly like to thank Dr. Jan-Michael Lange (Sen-ckenberg Naturhistorische Sammlungen Dresden) for various cor-rections, advises, and references that helped to improve this paper.
7. References
Danišik, M.; Migoń, P.; Kuhlemann, J.; Evans, N.J.; Dunkl, I., Frisch, W. (2010): Thermochronological constraints on the long-term erosional history of the Karkonosze Mts., Central Eu-rope. – Geomorphology, 117: 78 – 89, Amsterdam.
Frei, D.; Gerdes, A. (2009): Precise and accurate in situ U-Pb dat-ing of zircon with high sample throughput by automated La-SF-ICP-MS. Chemical Geology, 261: 261 – 270, Amsterdam.
Gerdes, A.; Zeh, A. (2006): Combined U-Pb and Hf isotope LA-(MC-)ICP-MS analysis of detrital zircons: Comparison with SHRIMP and new constraints for the provenance and age of an Armorican metasediment in Central Germany. Earth and Plane tary Science Letters, 249: 47 – 61, Amsterdam.
Hofmann, M.; Voigt, T.; Linnemann U. (2009): The sands of Pan - gea – U-Pb-LA-ICP-MS geochronology of detrital zircon grains: a case study of the Mesozoic of Central Europe. Schrif-ten reihe der Deutschen Gesellschaft für Geowissenschaften, 63: 140, Hannover.
Lamprecht, F. (1928): Schichtenfolge und Oberflächenformen im Winterberggebiete des Elbsandsteingebirges. – Mitteilungen des Vereins für Erdkunde Dresden, N.F., 1927: 1 – 48, Dresden.
Lamprecht, F. (1931): Die Schichten des sächsisch-böhmischen Turons rechts der Elbe. – Sonderabdruck Neues Jahrbuch für Mineralogie etc., Beil.-Bd. 67, Abt. B: 113 – 138.
Lamprecht, F. (1934): Die Schichtlagerung des Turons im säch-sisch-böhmischen Elbsandsteingebirge. – Berichte der mathe-matisch-physikalischen Klasse der Sächsischen Akademie der Wissenschaften zu Leipzig, 86: 155 – 186, Leipzig.
Lange, J.-M.; Tonk, C.; Wagner, G.A. (2008): Apatitspaltspurdaten zur postvariszischen thermotektonischen Entwicklung des sächsischen Grundgebirges – erste Ergebnisse. – Zeitschrift der Deutschen Gesellschaft für Geowissenschaften, 159: 123 – 132, Stuttgart.
Linnemann, U. (2008): Die Struktureinheiten des Saxothuringi-kums. – In: Linnemann, U. (Ed.): Das Saxothuringikum – Ab-riss der präkambrischen und paläozoischen Geologie von Sach-
sen und Thüringen. – 23 – 32, Dresden (Staatliche Natur his to-rische Sammlungen Dresden).
Linnemann, U.; Franz, C.; Hofmann, M.; Winkler, R.; Ullrich, B. (2011): The Dubrau Formation (Lower Ordovician, Lausitz Block) – Sedimentary facies, fossil assemblae, and U-Pb ages of detrital zircons from a peri-Gondwanan cold-water sec-tion with West African affinity. – Freiberger Forschungshefte, C 540: 119 – 139, Freiberg.
Lobst, R. (1993): Geologische Karte der Nationalparkregion Säch-sische Schweiz 1 : 50.000, Geologische Regionalkarte 1. – 1. Aufl., Sächsisches Landesamt für Umwelt und Geologie, Frei-berg.
Niebuhr, B.; Hiss, M.; Kaplan, U.; Tröger, K.-A.; Voigt, S.; Voigt, T.; Wiese, F.; Wilmsen, M. (Eds., 2007): Lithostratigraphie der norddeutschen Oberkreide. Schriftenreihe der Deutschen Ge-sellschaft für Geowissenschaften, 55: 49 – 66, Hannover.
Pälchen, W.; Walter, H. (Eds., 2008): Geologie von Sachsen. – 308 – 358, Stuttgart (Schweizerbart).
Pietzsch, K. (1963): Geologie von Sachsen. – 1 – 870, Berlin (VEB Deutscher Verlag der Wissenschaften).
Prescher, H. (1981): Probleme der Korrelation des Cenomas und Turons in der Sächsischen und Böhmischen Kreide. – Zeit-schrift für Geologische Wissenschaften, 9: 367 – 373, Berlin.
Sircombe, K.N. (2004): AgeDisplay: an Excel workbook to evalu-ate and display univariate geochronological data using binned frequency histograms and probability density distributions. Computers and Geosciences, 30: 21 – 31, Amsterdam.
Stacey, J.S.; Kramers, J.D. (1975): Approximation of terrestrial lead isotope evolution by a two-stage model. Earth and Plane-tary Science Letters, 26: 207 – 221, Amsterdam.
Tröger, K.-A. (1964): Die Ausbildung der Kreide (Cenoman bis Coniac) in der Umrandung des Lausitzer Massivs. – Geologie, 6: 717 – 773.
Voigt, T. (1994): Faziesentwicklung und Ablagerungssequenzen am Rand eines Epikontinentalmeeres – Die Entwicklungsge-schichte der Sächsischen Schweiz. – 1 – 130 (unpublished doc-toral thesis, Technische Universität Bergakademie Freiberg).
Walter, R. (2003): Erdgeschichte – Die Entstehung der Kontinente und Ozeane. – 1 – 325, Berlin, New York (de Gruyter).
Wilmsen, M.; Vodrázka, R.; Niebuhr, B. (2011): The Upper Ce no-manian and Lower Turonian of Lockwitz (Dresden area, Sa-xony, Germany): lithofacies, stratigraphy and fauna of a trans-gressive succession. – Freiberger Forschungshefte, C 540: 27 – 45, Freiberg.
M. Hofmann et al.: The Upper Cretaceous section at Schmilka in Saxony (Elbsandsteingebirge, Germany)
110
Tabl
e 1.
LA
-SF-
ICP-
MS
U, P
b, a
nd T
h da
ta o
f sin
gle
zirc
on g
rain
s fro
m th
e U
pper
Cre
tace
ous s
ands
tone
s of t
he S
chm
ilka
sect
ion
(Elb
sand
stei
ngeb
irge)
.
N
ame
of th
e sa
mpl
e as
wel
l as G
PS c
oord
inat
es, g
eolo
gica
l for
mat
ion,
stra
tigra
phic
age
, am
ount
of m
easu
red
zirc
on g
rain
s and
am
ount
of c
onco
rdan
t (w
ithin
90
to 1
10%
of c
onco
rdan
ce) a
naly
ses
are
give
n fo
r eac
h sa
mpl
e as
firs
t lin
e on
top
of th
e da
ta. —
Ital
ic/g
rey:
dis
cord
ant a
naly
ses (
not i
n th
e ra
nge
of 9
0–11
0 %
of d
egre
e of
con
cord
ance
)
Tabe
lle 1
. LA
-SF-
ICP-
MS
U, P
b un
d Th
Dat
en v
on e
inze
lnen
Zirk
onen
der
obe
rkre
tazi
sche
n Sa
ndst
eine
des
Sch
milk
a Pr
ofils
(Elb
sand
stei
ngeb
irge)
.
D
er P
robe
nnam
e, d
ie G
PS K
oord
inat
en, g
eolo
gisc
he F
orm
atio
n, st
ratig
raph
isch
es A
lter,
Anz
ahl d
er g
emes
sene
n Zi
rkon
e un
d A
nzah
l der
kon
kord
ante
n (in
nerh
alb
eine
r Kon
kord
anz
von
90 b
is 1
10%
) A
naly
sen
sind
für j
ede
Prob
e in
der
ers
ten
Zeile
übe
r den
jew
eilig
en D
aten
ang
egeb
en. —
Kur
siv/
grau
: dis
kord
ante
Ana
lyse
n (a
ußer
halb
des
90–
110%
Ber
eich
s der
Kon
kord
anz)
Sk 1
s (Sa
ndst
one
a, P
oste
lwitz
For
mat
ion,
Mid
dle
Turo
nian
) — 5
0° 54
′ 06.
7″ N
; 14°
13′ 0
7.5″
E,
mea
sure
d si
ngle
zirc
on g
rain
s: 1
11, c
onco
rdan
t with
in 9
0 – 11
0% o
f con
cord
ance
: 108
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
a216
879
233
151.
1662
980.
0556
31.
90.
4117
2.6
0.05
368
1.8
0.74
349
735
08
358
4098
a318
147
253
140.
3229
040.
0572
72.
00.
4250
2.5
0.05
382
1.5
0.79
359
736
08
364
3499
a417
190
190
110.
6785
40.
0559
33.
70.
4169
4.3
0.05
406
2.0
0.88
351
1335
413
374
4694
a516
084
105
131.
3047
710.
1026
42.
10.
8571
2.8
0.06
056
1.8
0.75
630
1262
913
624
3910
1
a612
584
569
0.68
5008
0.13
822
2.1
1.28
273.
70.
0673
13.
00.
5783
517
838
2184
763
98
a846
6657
30.
1456
110.
0620
32.
20.
4660
3.5
0.05
449
2.8
0.62
388
838
812
391
6299
a960
717
514
440.
7051
90.
0816
32.
00.
6513
3.4
0.05
786
2.8
0.57
506
1050
914
525
6296
a10
1522
821
712
0.46
9701
0.05
594
2.0
0.41
382.
80.
0536
51.
90.
7335
17
352
835
642
98
a11
1228
417
710
0.49
1365
40.
0545
52.
10.
4009
2.9
0.05
330
2.1
0.71
342
734
29
342
4710
0
a13
1343
114
811
0.36
8938
0.07
895
1.9
0.62
032.
90.
0569
82.
20.
6649
09
490
1149
148
100
a14
4901
242
232
0.38
984
0.07
479
1.9
0.58
623.
10.
0568
42.
40.
6346
59
468
1248
553
96
a16
1798
225
615
0.54
3357
50.
0566
02.
30.
4199
3.3
0.05
381
2.4
0.71
355
835
610
363
5398
a17
1467
415
711
1.29
654
0.05
581
2.2
0.41
207.
10.
0535
46.
70.
3135
08
350
2135
215
210
0
a18
3398
241
923
0.34
824
0.05
352
2.1
0.39
344.
40.
0533
23.
80.
4933
67
337
1334
287
98
a19
7396
511
137
0.68
2767
50.
3033
42.
14.
8434
2.4
0.11
580
1.2
0.87
1708
3117
9220
1892
2190
a20
4568
094
250.
6053
210
0.24
383
2.0
2.89
722.
50.
0861
81.
40.
8314
0726
1381
1913
4227
105
a21
1168
717
111
1.33
2286
0.05
663
1.9
0.42
582.
80.
0545
32.
10.
6735
57
360
939
347
90
a22
2975
732
128
0.69
2456
0.08
421
1.8
0.68
822.
40.
0592
71.
60.
7452
19
532
1057
736
90
a24
6629
764
914
10.
4310
603
0.06
143
10.0
0.45
8910
.10.
0541
81.
20.
9938
438
384
3337
926
101
a25
2664
735
140.
9114
780.
3425
12.
45.
7494
3.2
0.12
174
2.2
0.74
1899
4019
3928
1982
3996
a27
1044
665
80.
6445
280.
1113
32.
30.
9449
4.5
0.06
156
3.8
0.52
680
1567
522
659
8210
3
a28
2372
142
0.77
881
0.12
442
2.2
1.10
224.
60.
0642
54.
10.
4775
615
754
2575
087
101
a29
2121
129
517
0.42
2719
0.05
516
1.9
0.40
603.
20.
0533
92.
50.
6134
67
346
934
657
100
a30
5874
866
1.15
3146
0.05
608
2.0
0.41
413.
90.
0535
53.
30.
5335
27
352
1235
274
100
a31
6787
635
0.15
2103
0.08
919
3.0
0.71
734.
30.
0583
23.
10.
7055
116
549
1854
267
102
a32
6009
905
0.45
3150
0.05
849
2.3
0.43
693.
40.
0541
62.
50.
6736
68
368
1037
856
97
a33
2760
828
126
0.47
4987
0.09
107
2.4
0.74
772.
80.
0595
41.
60.
8456
213
567
1258
734
96
a35
1132
217
110
0.49
1244
80.
0572
21.
90.
4238
2.7
0.05
372
2.0
0.68
359
635
98
359
4510
0
111
GEOLOGICA SAXONICA — 59: 2013
Tabl
e 1
— S
k 1s
(San
dsto
ne a
, Pos
telw
itz F
orm
atio
n, M
iddl
e Tu
roni
an) c
ontin
ued.
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
a36
3519
660
190.
7957
070.
2993
83.
64.
4249
3.8
0.10
720
1.4
0.93
1688
5317
1732
1752
2596
a37
4784
725
1.56
8917
0.05
690
2.0
0.42
143.
30.
0537
12.
70.
5935
77
357
1035
961
99
a38
4429
593
0.20
1504
0.05
719
2.3
0.42
353.
90.
0537
03.
20.
5935
98
359
1235
971
100
a40
2142
510
411
0.61
2868
0.10
137
2.1
1.05
753.
20.
0756
62.
40.
6662
213
733
1710
8649
57
a41
5689
123
1.06
1496
0.20
192
2.5
2.18
283.
70.
0784
02.
80.
6711
8627
1176
2611
5755
102
a42
1042
811
17
0.83
1975
60.
0560
12.
00.
4143
3.2
0.05
365
2.5
0.64
351
735
210
356
5599
a43
1767
119
612
0.67
6807
0.05
679
2.9
0.42
033.
30.
0536
81.
60.
8835
610
356
1035
835
100
a44
1243
110
30.
9017
250.
2980
13.
14.
0515
4.1
0.09
860
2.6
0.77
1681
4616
4534
1598
4910
5
a47
7230
644
0.63
5398
0.06
051
3.0
0.45
184.
00.
0541
62.
60.
7537
911
379
1337
859
100
a49
2009
413
010
0.81
1058
80.
0710
31.
90.
5458
2.4
0.05
573
1.4
0.79
442
844
29
442
3210
0
a50
1792
913
08
0.26
8607
0.06
401
2.1
0.48
262.
80.
0546
81.
80.
7540
08
400
939
941
100
a51
7259
933
312
0.33
170
0.02
968
4.3
0.23
226.
00.
0567
24.
10.
7218
98
212
1148
191
39
a52
1469
569
40.
1370
80.
0611
43.
10.
4583
10.2
0.05
436
9.7
0.31
383
1238
333
386
218
99
a53
5414
430
115
0.43
237
0.04
859
2.2
0.35
284.
60.
0526
64.
00.
4730
67
307
1231
492
97
a54
7236
541
180.
8761
127
0.39
102
1.9
6.41
012.
20.
1189
01.
10.
8721
2834
2034
1919
4019
110
a55
2064
275
70.
6957
630.
0856
81.
90.
6807
3.4
0.05
762
2.9
0.55
530
1052
714
515
6310
3
a57
9612
564
1.10
1768
40.
0619
91.
90.
4642
3.2
0.05
431
2.6
0.60
388
738
710
384
5810
1
a58
1032
6042
170.
8689
330.
3569
52.
05.
7456
2.3
0.11
674
1.0
0.90
1968
3519
3820
1907
1710
3
a59
2027
171
50.
0813
674
0.08
069
1.9
0.63
734.
00.
0572
93.
50.
4850
09
501
1650
376
100
a60
6703
353
1.93
1633
0.06
569
2.2
0.50
113.
10.
0553
22.
10.
7341
09
412
1042
546
96
a62
7027
342
1.18
1284
90.
0633
92.
10.
4772
3.9
0.05
460
3.3
0.53
396
839
613
396
7510
0
a63
6578
173
0.32
956
0.17
119
2.4
1.66
193.
50.
0704
12.
60.
6810
1923
994
2294
052
108
a65
2989
572
50.
2274
20.
0769
05.
20.
5996
6.2
0.05
655
3.3
0.84
478
2447
724
474
7310
1
a66
1056
444
30.
2519
576
0.06
107
2.4
0.45
553.
00.
0541
01.
80.
7938
29
381
1037
541
102
b242
9876
50.
7089
60.
0569
82.
60.
4209
4.0
0.05
358
3.1
0.65
357
935
712
353
6910
1
b348
296
184
300.
0614
076
0.17
134
2.3
1.68
922.
60.
0715
01.
20.
8910
1922
1004
1797
225
105
b443
002
140
300.
4052
115
0.20
917
2.2
2.35
042.
60.
0814
91.
30.
8612
2425
1228
1912
3326
99
b543
619
416
350.
3726
530.
0823
32.
40.
6494
3.3
0.05
721
2.2
0.75
510
1250
813
500
4710
2
b640
464
185
340.
6756
397
0.17
259
2.3
1.67
293.
00.
0703
01.
90.
7710
2622
998
1993
739
110
b712
801
204
120.
2223
560
0.06
004
2.4
0.44
373.
20.
0536
02.
00.
7737
69
373
1035
445
106
b819
599
352
190.
2311
825
0.05
632
2.4
0.41
614.
40.
0535
83.
70.
5435
38
353
1335
383
100
b975
7977
80.
7031
270.
1028
52.
70.
8590
6.1
0.06
057
5.5
0.44
631
1663
029
624
118
101
b10
9623
728
0.07
1007
50.
1257
13.
11.
1015
3.9
0.06
355
2.3
0.80
763
2375
421
727
5010
5
b13
1639
216
011
0.35
460
0.06
480
2.9
0.48
9310
.30.
0547
69.
90.
2840
511
404
3540
322
210
1
b15
2724
331
727
0.20
1528
70.
0900
12.
20.
7122
2.9
0.05
738
1.8
0.78
556
1254
612
506
4011
0
b16
5807
755
0.23
1489
0.06
465
3.3
0.49
164.
90.
0551
43.
60.
6740
413
406
1741
881
97
M. Hofmann et al.: The Upper Cretaceous section at Schmilka in Saxony (Elbsandsteingebirge, Germany)
112
Tabl
e 1
— S
k 1s
(San
dsto
ne a
, Pos
telw
itz F
orm
atio
n, M
iddl
e Tu
roni
an) c
ontin
ued.
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
b17
2944
921
728
0.61
4525
60.
1238
62.
31.
0891
3.3
0.06
378
2.4
0.69
753
1674
818
734
5110
3
b18
2420
619
628
1.89
1452
0.11
911
3.3
1.02
944.
70.
0626
83.
30.
7072
523
719
2469
771
104
b19
1639
526
517
0.73
2760
0.05
958
2.4
0.44
634.
50.
0543
23.
90.
5337
39
375
1438
587
97
b20
6500
111
948
1.99
1424
70.
3076
92.
24.
2697
2.5
0.10
064
1.2
0.88
1729
3416
8821
1636
2210
6
b21
2641
944
726
0.56
2465
0.05
598
2.2
0.41
503.
80.
0537
63.
10.
5735
17
352
1136
170
97
b22
1165
2821
072
0.89
1161
50.
3095
62.
44.
3047
2.6
0.10
085
1.1
0.91
1739
3616
9422
1640
2010
6
b24
6943
130
80.
6320
440.
0576
32.
50.
4298
4.0
0.05
409
3.1
0.63
361
936
312
375
7096
b25
1077
395
102.
1248
30.
0719
72.
60.
5497
7.8
0.05
539
7.4
0.33
448
1144
528
428
164
105
b26
5102
946
756
0.46
5303
0.12
115
3.0
1.04
813.
20.
0627
51.
00.
9573
721
728
1770
022
105
b27
1157
923
914
0.92
2140
70.
0547
72.
30.
4044
3.2
0.05
356
2.1
0.74
344
834
59
352
4898
b28
6435
567
0.81
1986
0.11
419
2.6
0.97
573.
60.
0619
72.
50.
7269
717
691
1867
353
104
b29
2486
513
1.19
1200
0.05
695
2.7
0.42
325.
60.
0538
94.
90.
4935
710
358
1736
611
097
b30
6127
114
80.
7387
140.
0615
22.
90.
4619
6.1
0.05
446
5.4
0.48
385
1138
620
390
120
99
b31
4711
445
0.48
7773
0.10
299
2.6
0.84
614.
00.
0595
82.
90.
6763
216
622
1958
864
107
b32
1781
317
615
0.26
961
0.08
882
2.3
0.71
134.
00.
0580
83.
30.
5654
912
545
1753
373
103
b33
1723
124
518
1.08
441
0.06
700
2.6
0.51
105.
50.
0553
24.
90.
4641
810
419
1942
510
998
b36
7259
132
80.
3324
310.
0621
82.
30.
4657
3.1
0.05
432
2.1
0.74
389
938
810
384
4710
1
b37
1267
211
213
0.91
7781
0.10
531
2.5
0.88
563.
90.
0609
93.
00.
6364
515
644
1963
965
101
b38
3188
645
529
0.41
2472
0.06
254
2.2
0.46
683.
50.
0541
32.
70.
6339
18
389
1137
762
104
b39
1101
618
911
0.48
3667
0.05
735
2.2
0.42
284.
10.
0534
73.
40.
5436
08
358
1234
977
103
b40
1096
311
712
1.98
3305
0.08
570
2.2
0.67
903.
20.
0574
62.
40.
6853
011
526
1350
952
104
b41
1312
694
121.
2021
081
0.10
984
2.3
0.92
662.
90.
0611
81.
80.
7967
215
666
1464
638
104
b42
1097
710
59
0.89
2015
0.08
266
2.4
0.65
773.
20.
0577
12.
20.
7451
212
513
1351
948
99
b43
6769
374
0.94
4072
0.08
798
2.7
0.69
863.
90.
0575
92.
70.
7154
414
538
1651
460
106
b44
2143
528
316
0.62
1180
40.
0557
42.
20.
4099
2.5
0.05
333
1.3
0.87
350
834
98
343
2910
2
b46
2398
219
817
0.40
2289
0.08
589
2.6
0.68
613.
80.
0579
32.
80.
6953
113
530
1652
760
101
b47
1783
120
812
0.35
3275
00.
0598
52.
40.
4436
3.3
0.05
376
2.2
0.74
375
937
310
361
5010
4
b48
4666
804
0.81
8955
0.04
080
2.1
0.28
883.
20.
0513
32.
40.
6625
85
258
725
655
101
b49
1766
915
49
0.45
1828
0.05
644
2.6
0.41
914.
90.
0538
64.
20.
5335
49
355
1536
594
97
b50
6469
725
2.14
1201
30.
0544
92.
30.
3986
3.3
0.05
305
2.3
0.71
342
834
110
331
5210
3
b51
2030
518
410
0.47
1164
0.05
172
2.1
0.37
914.
20.
0531
73.
60.
5032
57
326
1233
682
97
b52
3604
635
419
0.23
6685
30.
0562
82.
20.
4129
2.8
0.05
322
1.7
0.80
353
835
18
338
3810
4
b53
7963
744
0.55
3474
0.05
829
2.4
0.43
553.
30.
0541
82.
30.
7236
58
367
1037
951
96
b54
5956
283
0.84
1720
0.10
014
2.3
0.85
063.
40.
0616
02.
50.
6861
514
625
1666
053
93
b55
1243
691
60.
0211
400.
0715
82.
60.
5502
6.7
0.05
574
6.2
0.39
446
1144
524
442
137
101
b57
3698
030
416
0.17
6815
20.
0571
42.
30.
4200
2.8
0.05
331
1.7
0.81
358
835
69
342
3710
5
113
GEOLOGICA SAXONICA — 59: 2013
Tabl
e 1
— S
k 1s
(San
dsto
ne a
, Pos
telw
itz F
orm
atio
n, M
iddl
e Tu
roni
an) c
ontin
ued.
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
b58
2105
312
98
0.21
3762
50.
0633
32.
50.
4835
2.7
0.05
536
1.2
0.90
396
940
09
427
2793
b59
1331
712
26
0.20
820
0.05
407
3.3
0.39
676.
20.
0532
25.
20.
5433
911
339
1833
811
810
0
b60
7469
534
0.68
618
0.06
310
2.2
0.47
885.
60.
0550
35.
20.
3939
48
397
1941
311
695
b61
6178
641
130.
7310
712
0.28
984
2.4
4.37
762.
60.
1095
41.
00.
9216
4134
1708
2217
9219
92
b62
1172
239
40.
8218
694
0.10
681
2.5
0.90
454.
00.
0614
23.
20.
6165
415
654
2065
469
100
b63
3115
414
512
1.04
1013
0.07
185
3.4
0.55
744.
40.
0562
62.
80.
7744
715
450
1646
361
97
b64
9014
624
1.33
1670
80.
0556
42.
30.
4074
3.0
0.05
311
1.9
0.77
349
834
79
334
4310
5
b65
6400
422
0.57
1178
10.
0561
02.
80.
4144
3.5
0.05
358
2.2
0.78
352
935
211
354
5099
b66
2055
172
70.
7330
690.
0842
92.
80.
6704
3.9
0.05
768
2.7
0.73
522
1452
116
518
5910
1
Tabl
e 1
— a
Sk 2
-2 (S
ands
tone
e, S
chra
mm
stei
n Fo
rmat
ion,
Low
er C
onia
cium
) — 5
0° 54
′ 32.
9″ N
; 14°
14′ 3
3.4″
E,
mea
sure
d si
ngle
zirc
on g
rain
s: 1
20, c
onco
rdan
t with
in 9
0 – 11
0% o
f con
cord
ance
: 59
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
a143
313
10.
9283
60.
0479
73.
70.
3476
12.7
0.05
256
12.2
0.29
302
1130
334
310
278
98
a223
9351
40.
9541
300.
0609
13.
50.
4900
6.3
0.05
834
5.2
0.55
381
1340
521
543
115
70
a340
8086
50.
2467
990.
0514
83.
60.
4275
8.9
0.06
022
8.1
0.40
324
1136
127
612
176
53
a493
6715
111
0.12
1640
20.
0777
03.
50.
6174
5.4
0.05
763
4.1
0.65
482
1648
821
516
9094
a544
3292
60.
3315
790.
0581
13.
90.
5310
4.8
0.06
627
2.8
0.81
364
1443
217
815
5945
a647
6636
50.
8959
40.
0996
93.
61.
4989
36.5
0.10
905
36.4
0.10
613
2193
025
117
8466
334
a736
839
9629
0.27
5542
0.28
593
4.6
3.86
115.
30.
0979
42.
50.
8816
2167
1606
4315
8547
102
a817
909
9718
0.20
1697
00.
1841
83.
31.
9192
4.1
0.07
558
2.5
0.80
1090
3310
8828
1084
5010
1
a986
4118
99
0.28
1320
10.
0466
04.
00.
4291
7.0
0.06
679
5.7
0.58
294
1236
322
831
119
35
a10
8190
137
120.
4816
330.
0813
85.
00.
6743
6.8
0.06
010
4.7
0.73
504
2452
328
607
101
83
a11
4527
807
0.25
2345
0.08
671
3.2
0.70
855.
90.
0592
64.
90.
5453
616
544
2557
710
793
a12
4164
108
60.
3067
470.
0557
73.
90.
4204
5.7
0.05
467
4.2
0.68
350
1335
617
399
9388
a13
1202
419
515
0.20
3365
0.07
849
4.3
0.63
005.
20.
0582
13.
00.
8248
720
496
2153
865
91
a14
3863
168
270.
3112
568
0.37
045
2.4
6.47
203.
60.
1267
12.
70.
6720
3243
2042
3220
5347
99
a15
6564
829
0.72
1240
0.09
153
5.5
0.78
986.
60.
0625
93.
60.
8356
530
591
3069
477
81
a16
2370
604
0.16
1948
0.06
337
3.7
0.51
258.
10.
0586
57.
20.
4539
614
420
2855
415
871
M. Hofmann et al.: The Upper Cretaceous section at Schmilka in Saxony (Elbsandsteingebirge, Germany)
114
Tabl
e 1
— a
Sk 2
-2 (S
ands
tone
e, S
chra
mm
stei
n Fo
rmat
ion,
Low
er C
onia
cium
) con
tinue
d.
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
a17
6071
166
90.
3081
060.
0520
83.
40.
3921
4.7
0.05
460
3.3
0.72
327
1133
614
396
7383
a18
7186
729
471
0.39
7203
0.22
311
2.6
2.58
493.
00.
0840
31.
40.
8812
9831
1296
2212
9328
100
a19
2887
865
0.18
5095
0.05
981
4.2
0.47
296.
70.
0573
45.
30.
6237
415
393
2250
511
674
a20
5208
125
70.
0322
630.
0604
04.
30.
5001
7.2
0.06
005
5.8
0.60
378
1641
225
605
125
62
a21
3535
715
0.14
1429
0.06
370
4.2
0.65
567.
70.
0746
56.
50.
5439
816
512
3210
5913
138
a22
2186
366
220.
5122
024
0.29
645
2.8
4.12
974.
40.
1010
33.
30.
6516
7442
1660
3616
4362
102
a23
7292
197
0.70
6922
0.31
463
2.2
4.61
914.
60.
1064
84.
00.
4917
6335
1753
3917
4073
101
a24
3283
610
533
0.39
9829
0.28
868
4.3
3.99
294.
80.
1003
22.
10.
9016
3563
1633
4016
3039
100
a25
895
62
1.52
1194
0.18
496
4.6
1.93
569.
50.
0759
08.
20.
4910
9447
1093
6510
9216
510
0
a26
6318
122
100.
1637
330.
0801
35.
80.
6601
6.7
0.05
975
3.4
0.86
497
2851
527
594
7484
a27
1117
317
015
0.35
935
0.08
335
5.9
0.80
126.
20.
0697
21.
90.
9551
629
597
2892
039
56
a28
7306
123
668
0.11
3751
0.28
737
2.7
4.01
904.
00.
1014
32.
90.
6816
2839
1638
3316
5054
99
a29
2739
591
300.
3087
620.
3146
75.
24.
6682
7.7
0.10
760
5.7
0.67
1764
8017
6266
1759
103
100
a30
1311
410
620
0.28
2367
0.17
897
3.9
1.76
695.
30.
0716
03.
60.
7310
6138
1033
3597
574
109
a31
3073
837
0.49
5478
0.07
740
4.3
0.60
447.
00.
0566
35.
50.
6248
120
480
2747
712
110
1
a32
1939
149
524
0.08
714
0.04
964
3.1
0.45
425.
50.
0663
64.
50.
5731
210
380
1881
894
38
a33
2199
734
0.39
4049
0.05
811
4.7
0.44
127.
00.
0550
75.
20.
6736
417
371
2241
511
788
a34
4040
617
0.43
6548
0.11
124
5.4
0.95
857.
40.
0624
95.
00.
7368
035
683
3769
110
798
a35
5490
101
100.
2213
570.
0949
26.
40.
8679
7.6
0.06
632
4.0
0.85
585
3663
436
817
8472
a36
2508
596
0.13
4267
0.09
705
5.2
0.79
646.
90.
0595
24.
60.
7559
729
595
3158
699
102
a37
1098
318
818
0.23
3416
0.09
645
4.3
0.86
366.
50.
0649
44.
90.
6659
424
632
3177
210
377
a38
907
252
0.50
1673
0.06
201
6.4
0.46
709.
70.
0546
27.
40.
6538
824
389
3239
716
698
a39
2996
946
945
0.47
876
0.08
159
3.7
0.79
726.
00.
0708
64.
70.
6150
618
595
2795
397
53
a40
4061
108
70.
1819
390.
0615
94.
30.
5044
7.5
0.05
940
6.1
0.57
385
1641
526
582
133
66
a41
1848
633
0.78
3433
0.03
895
6.7
0.29
3710
.40.
0546
97.
90.
6524
616
261
2440
017
762
a42
3863
486
0.91
2502
0.09
353
8.7
0.73
819.
50.
0572
33.
80.
9257
648
561
4250
184
115
a43
6685
169
100.
2655
360.
0567
34.
20.
4269
5.3
0.05
457
3.2
0.80
356
1536
116
395
7190
a44
2158
550
160.
2821
041
0.30
019
6.8
4.31
989.
30.
1043
76.
30.
7316
9210
116
9779
1703
116
99
a45
1579
822
719
0.17
319
0.08
467
4.4
0.70
167.
50.
0601
06.
00.
6052
422
540
3260
713
086
a46
5805
366
0.42
8194
0.16
529
4.9
1.63
446.
10.
0717
13.
60.
8098
645
984
3997
874
101
a47
7494
166
100.
2813
752
0.05
724
5.0
0.43
489.
10.
0551
07.
50.
5635
918
367
2841
616
886
a48
3555
785
0.42
2860
0.05
646
5.6
0.41
777.
20.
0536
54.
50.
7835
419
354
2235
610
299
a49
2162
421
0.12
3873
0.03
118
12.4
0.24
2314
.50.
0563
67.
50.
8519
824
220
2946
716
642
a50
2891
263
0.32
1916
0.10
918
4.7
0.93
498.
00.
0621
06.
50.
5866
830
670
4067
813
999
a51
531
50
0.19
297
0.08
981
4.2
0.86
2316
.80.
0696
316
.20.
2555
423
631
8291
833
360
a52
1088
555
70.
2926
10.
1004
82.
51.
4690
15.6
0.10
603
15.4
0.16
617
1591
899
1732
282
36
115
GEOLOGICA SAXONICA — 59: 2013
Tabl
e 1
— a
Sk 2
-2 (S
ands
tone
e, S
chra
mm
stei
n Fo
rmat
ion,
Low
er C
onia
cium
) con
tinue
d.
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
a53
8684
977
0.29
327
0.06
427
6.5
0.79
898.
30.
0901
55.
20.
7840
225
596
3814
2910
028
a54
529
61
0.89
646
0.06
410
5.3
0.72
0925
.80.
0815
725
.30.
2040
020
551
116
1235
496
32
a55
1816
517
019
0.01
6544
0.12
360
4.5
1.06
796.
20.
0626
64.
30.
7275
132
738
3369
792
108
a56
4798
395
0.39
2261
0.11
303
8.8
0.89
4411
.30.
0573
97.
10.
7869
058
649
5650
615
713
6
a57
3163
463
0.57
4682
0.06
539
8.1
0.61
6112
.50.
0683
39.
50.
6540
832
487
5087
919
846
a58
1501
824
100.
4858
520.
3796
26.
55.
5256
7.9
0.10
557
4.4
0.83
2075
117
1905
7017
2480
120
a59
5009
793
0.29
2102
0.04
072
6.6
0.34
309.
60.
0610
97.
00.
6925
717
299
2564
215
040
a60
5319
554
0.11
9365
0.07
956
4.6
0.63
256.
60.
0576
64.
70.
7049
422
498
2651
710
496
b112
9760
30.
1723
610.
0451
16.
50.
3448
9.5
0.05
543
6.9
0.68
284
1830
125
430
154
66
b218
8811
55
0.51
3600
0.04
188
3.0
0.30
585.
90.
0529
45.
10.
5126
58
271
1432
611
581
b314
475
362
310.
2515
470.
0847
85.
40.
7369
6.8
0.06
303
4.2
0.79
525
2756
130
709
9074
b451
9625
914
0.03
9728
0.05
934
3.2
0.44
344.
50.
0542
03.
20.
7137
211
373
1437
971
98
b515
760
463
300.
4141
10.
0561
73.
50.
7900
4.6
0.10
201
3.0
0.77
352
1259
121
1661
5521
b615
6336
50.
6721
000.
1124
13.
00.
9686
6.1
0.06
249
5.3
0.50
687
2068
831
691
113
99
b752
0059
100.
3270
820.
1649
45.
71.
6887
6.9
0.07
426
3.9
0.82
984
5210
0445
1048
7894
b817
9575
50.
2028
980.
0615
73.
80.
5311
5.5
0.06
256
4.1
0.68
385
1443
320
693
8756
b924
7513
97
0.34
4602
0.05
042
3.3
0.37
675.
70.
0541
94.
60.
5831
710
325
1637
910
484
b10
3668
548
0.25
5063
0.15
076
5.0
1.52
006.
90.
0731
34.
80.
7290
542
938
4310
1798
89
b11
4163
193
120.
1714
140.
0640
64.
70.
5552
6.8
0.06
286
5.0
0.68
400
1844
825
703
106
57
b12
6518
9518
0.23
9242
0.18
151
4.7
1.80
006.
20.
0719
24.
10.
7510
7547
1045
4198
483
109
b13
963
684
0.34
2050
0.04
957
7.7
0.32
7011
.60.
0478
48.
70.
6631
224
287
2992
205
340
b14
6635
408
190.
1311
330.
0477
07.
20.
4200
11.5
0.06
386
8.9
0.63
300
2135
635
737
189
41
b15
4223
264
150.
2326
420.
0560
16.
10.
4142
7.4
0.05
363
4.1
0.83
351
2135
222
356
9499
b16
5195
5814
0.50
6355
0.21
218
5.4
2.39
517.
40.
0818
75.
10.
7312
4061
1241
5512
4210
010
0
b17
2370
117
80.
1140
380.
0696
03.
70.
5696
6.4
0.05
935
5.2
0.59
434
1645
824
580
112
75
b18
525
282
0.09
934
0.07
375
6.2
0.58
5316
.10.
0575
614
.90.
3945
928
468
6251
332
789
b19
6683
7220
0.31
1517
0.27
866
5.3
3.33
306.
60.
0867
54.
00.
8015
8575
1489
5313
5577
117
b20
1657
885
0.23
2542
0.05
664
5.2
0.52
109.
70.
0667
28.
20.
5335
518
426
3482
917
143
b21
2424
787
0.17
1714
0.08
745
5.5
0.73
518.
20.
0609
76.
10.
6754
029
560
3663
813
085
b22
3395
143
130.
2757
200.
0926
76.
90.
7579
8.6
0.05
931
5.1
0.81
571
3857
338
578
110
99
b23
5163
259
230.
1385
320.
0941
86.
80.
7827
8.2
0.06
027
4.7
0.82
580
3858
737
613
101
95
b24
978
84
1.98
1053
0.28
796
7.8
3.78
3510
.90.
0952
97.
60.
7216
3111
415
8991
1534
143
106
b25
1380
783
340.
1064
450.
4129
96.
26.
9155
7.3
0.12
145
3.9
0.84
2229
118
2101
6719
7870
113
b26
1997
170
100.
2837
560.
0574
04.
90.
4280
7.1
0.05
407
5.2
0.69
360
1736
222
374
116
96
b27
1957
749
0.60
3009
0.09
977
7.9
0.89
479.
70.
0650
45.
70.
8161
346
649
4877
612
079
b28
4682
196
270.
5677
730.
1235
14.
41.
0375
5.6
0.06
092
3.4
0.78
751
3172
329
636
7411
8
M. Hofmann et al.: The Upper Cretaceous section at Schmilka in Saxony (Elbsandsteingebirge, Germany)
116
Tabl
e 1
— a
Sk 2
-2 (S
ands
tone
e, S
chra
mm
stei
n Fo
rmat
ion,
Low
er C
onia
cium
) con
tinue
d.
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
b29
5280
234
220.
3537
020.
0852
57.
00.
7362
8.6
0.06
263
5.0
0.82
527
3656
038
696
106
76
b30
1472
216
0.47
609
0.23
840
4.4
2.77
268.
50.
0843
57.
30.
5113
7855
1348
6613
0114
210
6
c178
4659
110.
3611
096
0.17
496
1.9
1.73
153.
30.
0717
82.
70.
5810
3918
1020
2298
055
106
c212
985
242
210.
2722
668
0.08
342
2.1
0.66
593.
00.
0578
92.
10.
6951
710
518
1252
647
98
c325
6775
40.
4148
590.
0557
32.
00.
4081
4.5
0.05
311
4.0
0.45
350
734
813
334
9110
5
c482
0260
120.
6411
443
0.17
908
1.8
1.79
173.
00.
0725
62.
40.
5910
6217
1042
2010
0249
106
c563
0416
711
0.33
2848
0.06
049
2.2
0.49
553.
50.
0594
12.
70.
6237
98
409
1258
259
65
c610
407
2811
0.98
1028
60.
3081
31.
84.
3545
2.8
0.10
250
2.1
0.66
1731
2817
0423
1670
3910
4
c741
9545
60.
1764
690.
1380
12.
01.
2494
4.2
0.06
566
3.7
0.48
833
1682
324
796
7710
5
c811
734
498
0.32
3389
0.12
536
2.3
2.39
093.
70.
1383
22.
90.
6376
117
1240
2722
0650
35
c969
2743
100.
3594
660.
2129
51.
22.
1743
3.2
0.07
405
2.9
0.39
1245
1411
7322
1043
5911
9
c10
1346
141
421
0.10
2036
00.
0531
32.
10.
3923
2.9
0.05
356
2.1
0.72
334
733
68
352
4795
c11
3159
446
1.18
3802
0.10
573
1.4
0.89
164.
10.
0611
63.
90.
3564
89
647
2064
583
100
c12
5005
218
458
0.64
4893
0.26
990
3.3
3.64
895.
20.
0980
54.
00.
6315
4045
1560
4215
8776
97
c13
5810
926
269
0.29
2325
0.25
266
2.4
3.14
772.
80.
0903
61.
60.
8414
5231
1444
2214
3330
101
c14
3469
335
0.65
5237
0.14
224
3.2
1.30
865.
80.
0667
34.
80.
5685
726
850
3482
910
110
3
c15
6513
257
0.29
7454
0.25
798
1.8
3.15
183.
80.
0886
13.
30.
4814
7924
1445
3013
9663
106
c16
1669
61
0.29
1753
0.21
268
3.1
2.84
157.
50.
0969
06.
80.
4212
4335
1367
5815
6512
879
c17
8752
3810
0.50
1019
40.
2378
92.
02.
8482
3.5
0.08
683
2.9
0.58
1376
2513
6827
1357
5610
1
c18
3392
010
432
0.88
4541
0.23
115
3.4
3.29
293.
80.
1033
21.
70.
9013
4141
1479
3016
8531
80
c19
1529
351
181.
0916
828
0.26
949
1.2
3.41
842.
40.
0920
02.
10.
4915
3816
1509
1914
6740
105
c20
7514
112
120.
2949
760.
1027
92.
30.
8505
4.1
0.06
001
3.4
0.57
631
1462
519
604
7310
4
c21
8563
799
0.85
201
0.08
177
2.5
1.59
4111
.40.
1413
911
.20.
2250
712
968
7422
4419
323
c22
4156
811
738
0.32
4100
00.
3040
11.
74.
2930
2.2
0.10
242
1.3
0.80
1711
2616
9218
1668
2410
3
c23
1191
734
120.
6412
142
0.29
925
2.3
4.10
153.
40.
0994
12.
50.
6716
8834
1655
2816
1346
105
c24
5074
638
0.71
8441
0.10
901
2.0
0.91
923.
00.
0611
52.
20.
6866
713
662
1564
547
103
c25
3092
896
0.49
5767
0.05
948
2.4
0.44
774.
10.
0545
93.
30.
5937
29
376
1339
575
94
c26
4221
956
0.34
880
0.05
528
2.3
0.52
746.
70.
0692
06.
30.
3434
78
430
2490
512
938
c27
3240
883
300.
4974
730.
3145
22.
14.
5725
3.1
0.10
544
2.2
0.70
1763
3317
4426
1722
4010
2
c28
1060
342
110.
3612
026
0.24
292
2.7
2.98
983.
90.
0892
72.
80.
6814
0234
1405
3014
1054
99
c29
8954
8312
0.30
1342
50.
1440
01.
21.
3397
2.7
0.06
748
2.5
0.43
867
986
316
852
5110
2
c30
698
71
0.66
1026
0.11
833
3.1
1.13
317.
00.
0694
56.
20.
4472
121
769
3891
212
979
117
GEOLOGICA SAXONICA — 59: 2013
Tabl
e 1
— S
k 3-
1 (S
ands
tone
d, S
chra
mm
stei
n Fo
rmat
ion,
Low
er C
onia
cium
) — 5
0° 54
′ 31″
N; 1
4° 14
′ 16.
5″ E
, m
easu
red
sing
le z
ircon
gra
ins:
115
, con
cord
ant w
ithin
90 –
110%
of c
onco
rdan
ce: 4
6
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
a120
1512
26
0.51
3807
0.04
895
3.9
0.35
356.
80.
0523
85.
60.
5730
812
307
1830
212
710
2
a225
8315
50.
7126
740.
2983
63.
84.
0512
6.4
0.09
848
5.2
0.59
1683
5616
4553
1596
9610
5
a364
4825
118
0.41
1119
30.
0722
82.
20.
5786
3.4
0.05
805
2.6
0.66
450
1046
413
532
5685
a421
0797
70.
5938
370.
0686
62.
50.
5239
4.7
0.05
534
4.0
0.52
428
1042
817
426
9010
1
a544
223
10.
5679
70.
0543
14.
50.
4182
9.1
0.05
585
8.0
0.49
341
1535
528
446
177
76
a630
0313
57
0.26
964
0.05
108
3.4
0.48
397.
50.
0687
06.
70.
4532
111
401
2589
013
836
a814
8749
50.
5624
790.
0903
83.
00.
7433
5.5
0.05
964
4.6
0.54
558
1656
424
591
101
94
a911
0063
30.
4321
110.
0513
53.
30.
3718
6.5
0.05
251
5.6
0.51
323
1032
118
308
127
105
a11
8250
404
210.
4519
970.
0500
02.
10.
4371
6.5
0.06
340
6.1
0.33
315
736
820
722
130
44
a12
2421
106
70.
3213
380.
0697
03.
20.
5737
6.8
0.05
970
5.9
0.48
434
1446
025
593
129
73
a13
1065
634
0.58
2069
0.05
499
1.8
0.39
305.
40.
0518
35.
10.
3334
56
337
1527
811
612
4
a14
1304
814
0.55
2304
0.05
286
2.2
0.37
885.
40.
0519
75.
00.
4033
27
326
1528
411
411
7
a15
986
553
0.69
1825
0.04
159
3.7
0.31
188.
60.
0543
77.
70.
4426
310
276
2138
617
368
a16
3532
9412
1.26
5906
0.10
798
2.8
0.91
945.
30.
0617
54.
50.
5366
118
662
2666
696
99
a17
1686
101
60.
9914
760.
0535
03.
60.
4034
6.4
0.05
469
5.4
0.56
336
1234
419
400
120
84
a18
2638
154
80.
3129
660.
0555
82.
00.
4122
4.7
0.05
379
4.3
0.43
349
735
014
362
9696
a19
1492
694
0.44
748
0.05
589
4.2
0.52
3010
.70.
0678
69.
80.
3935
114
427
3886
420
341
a20
1545
283
420.
9111
914
0.46
434
6.4
7.20
129.
70.
1124
87.
20.
6724
5913
321
3790
1840
130
134
a21
2117
654
0.30
301
0.06
065
4.3
0.72
3813
.30.
0865
612
.50.
3338
016
553
5813
5124
228
a22
5727
202
120.
2728
20.
0529
02.
20.
7365
3.3
0.10
097
2.5
0.66
332
756
014
1642
4620
a23
3398
128
100.
4134
400.
0765
24.
50.
6045
6.2
0.05
730
4.3
0.72
475
2048
024
503
9594
a24
1387
825
0.57
2497
0.05
383
2.1
0.42
106.
90.
0567
26.
60.
3033
87
357
2148
114
570
a25
803
533
1.68
1536
0.04
969
2.9
0.36
066.
70.
0526
36.
00.
4331
39
313
1831
313
710
0
a26
1581
805
0.42
2399
0.05
723
3.0
0.52
9410
.40.
0670
89.
90.
2935
911
431
3784
020
643
a27
2754
798
1.20
1270
0.08
993
3.3
0.88
725.
10.
0715
53.
90.
6555
518
645
2597
379
57
a28
1256
744
0.68
2262
0.05
660
2.3
0.41
715.
10.
0534
54.
50.
4535
58
354
1534
810
310
2
a29
1911
806
0.31
849
0.07
540
2.6
0.59
2010
.90.
0569
410
.50.
2446
912
472
4248
923
396
a30
807
263
0.48
1337
0.09
441
2.6
0.78
368.
30.
0601
97.
90.
3158
215
588
3861
117
195
a31
4145
263
140.
4834
320.
0536
31.
80.
4214
6.6
0.05
698
6.4
0.27
337
635
720
491
140
69
a32
2385
130
90.
3541
920.
0727
63.
00.
5808
6.8
0.05
789
6.1
0.44
453
1346
526
526
135
86
a33
4694
242
180.
1377
170.
0778
94.
10.
6223
6.8
0.05
795
5.4
0.60
484
1949
127
528
119
92
a34
3735
183
120.
2620
650.
0687
12.
70.
5292
3.7
0.05
586
2.5
0.73
428
1143
113
447
5696
a35
2901
196
110.
3512
670.
0563
62.
90.
4149
7.3
0.05
339
6.7
0.39
353
1035
222
345
153
102
a36
625
392
1.19
1070
0.05
396
2.8
0.43
808.
20.
0588
77.
70.
3433
99
369
2656
216
860
a37
876
523
0.52
1559
0.04
949
4.6
0.37
988.
30.
0556
67.
00.
5531
114
327
2443
915
571
a38
1969
117
81.
8036
570.
0517
83.
20.
3873
5.7
0.05
424
4.7
0.56
325
1033
216
381
106
85
M. Hofmann et al.: The Upper Cretaceous section at Schmilka in Saxony (Elbsandsteingebirge, Germany)
118
Tabl
e 1
— S
k 3-
1 (S
ands
tone
d, S
chra
mm
stei
n Fo
rmat
ion,
Low
er C
onia
cium
) con
tinue
d.
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
a39
1154
158
030
0.13
2985
0.05
460
3.1
0.45
136.
10.
0599
65.
30.
5134
310
378
2060
211
457
a40
9499
4816
0.48
9466
0.32
960
3.4
4.59
274.
50.
1010
62.
90.
7618
3655
1748
3816
4454
112
a41
4161
144
110.
1175
150.
0798
92.
30.
6147
4.7
0.05
580
4.1
0.49
495
1148
618
444
9111
2
a42
4839
161
120.
1988
040.
0776
23.
80.
5933
5.8
0.05
543
4.4
0.65
482
1847
322
430
9911
2
a44
477
181
0.01
810
0.06
046
2.8
0.49
5312
.90.
0594
112
.60.
2237
810
409
4458
227
365
a45
4786
141
80.
2153
10.
0536
53.
00.
5899
6.6
0.07
973
5.9
0.45
337
1047
125
1190
117
28
a46
4893
8810
0.65
8145
0.10
381
2.5
0.86
723.
40.
0605
92.
30.
7363
715
634
1662
550
102
a47
800
122
0.98
1280
0.11
349
3.0
0.98
217.
40.
0627
66.
80.
4069
320
695
3870
014
599
a48
2130
714
0.57
1391
0.05
812
2.3
0.46
744.
90.
0583
34.
30.
4736
48
389
1654
295
67
a49
1504
493
0.77
2106
0.06
152
3.4
0.47
709.
30.
0562
38.
70.
3738
513
396
3146
219
283
a50
1247
422
0.13
2491
0.05
851
3.1
0.40
896.
00.
0506
85.
20.
5136
711
348
1822
712
016
2
a51
2034
533
0.11
1343
0.05
991
2.5
0.54
3010
.80.
0657
410
.50.
2337
59
440
3979
822
047
a52
2749
824
0.07
5146
0.05
546
2.4
0.41
114.
80.
0537
64.
20.
5034
88
350
1436
194
96
a53
1484
443
0.50
1607
0.05
727
3.3
0.42
335.
30.
0536
14.
10.
6235
911
358
1635
493
101
a54
2368
814
0.14
4844
0.05
008
3.8
0.34
8415
.20.
0504
514
.70.
2531
512
304
4121
634
114
6
a55
1312
332
0.09
2373
0.06
048
3.4
0.46
545.
30.
0558
24.
00.
6537
913
388
1744
589
85
a56
3604
103
60.
3665
840.
0547
14.
20.
4150
9.8
0.05
502
8.8
0.43
343
1435
230
413
197
83
a57
4353
544
0.13
969
0.07
840
7.8
0.75
9123
.10.
0702
321
.70.
3448
737
573
107
935
446
52
a58
3112
124
0.42
2121
0.32
269
3.8
3.89
806.
30.
0876
14.
90.
6118
0361
1613
5213
7495
131
a59
3304
425
0.46
5310
0.11
005
3.1
0.95
535.
30.
0629
64.
30.
5967
320
681
2770
792
95
a60
8211
4110
1.28
4538
0.19
705
4.3
2.11
016.
10.
0776
74.
30.
7111
5946
1152
4311
3885
102
b120
861
6125
1.54
5958
0.31
611
2.8
4.73
993.
20.
1087
51.
50.
8917
7144
1774
2717
7927
100
b236
544
193
500.
3924
410
0.25
191
3.3
3.04
203.
80.
0875
81.
90.
8714
4843
1418
3013
7336
105
b325
2810
31.
5327
390.
2512
82.
83.
2363
5.8
0.09
341
5.1
0.48
1445
3614
6646
1496
9697
b457
1316
510
0.32
1153
0.06
051
2.3
0.56
823.
30.
0681
12.
30.
7037
99
457
1287
248
43
b563
4824
413
0.09
5183
0.05
505
4.4
0.40
636.
80.
0535
35.
20.
6434
515
346
2035
111
798
b728
2610
25
0.03
5299
0.05
870
3.4
0.43
645.
50.
0539
34.
30.
6236
812
368
1736
898
100
b861
5517
513
0.50
1120
00.
0712
42.
20.
5443
3.1
0.05
541
2.2
0.70
444
944
111
429
5010
3
b922
4879
50.
4819
000.
0593
02.
80.
5111
7.8
0.06
250
7.3
0.35
371
1041
927
691
155
54
b10
2655
625
0.50
4578
0.07
843
2.2
0.63
533.
80.
0587
43.
10.
5948
711
499
1555
867
87
b11
8389
4512
1.07
9247
0.22
890
2.9
2.89
063.
80.
0915
92.
50.
7613
2935
1379
2914
5948
91
b12
1289
483
0.16
2424
0.05
618
2.7
0.41
755.
70.
0539
15.
10.
4735
29
354
1736
711
496
b13
7672
298
150.
2922
100.
0514
83.
10.
4202
5.1
0.05
920
4.1
0.60
324
1035
616
574
8956
b14
5570
150
120.
1394
010.
0822
02.
30.
6863
4.6
0.06
055
3.9
0.51
509
1153
119
623
8582
b15
2533
107
60.
6826
170.
0565
12.
60.
4284
7.2
0.05
498
6.7
0.36
354
936
222
411
150
86
b16
5909
117
110.
3098
650.
0981
42.
90.
8175
3.8
0.06
042
2.5
0.76
603
1760
718
619
5398
119
GEOLOGICA SAXONICA — 59: 2013
Tabl
e 1
— S
k 3-
1 (S
ands
tone
d, S
chra
mm
stei
n Fo
rmat
ion,
Low
er C
onia
cium
) con
tinue
d.
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
b17
3577
150
80.
3034
360.
0511
23.
00.
4000
4.8
0.05
675
3.7
0.63
321
934
214
482
8267
b18
2948
624
0.60
370
0.06
029
3.4
0.73
8211
.90.
0888
111
.30.
2937
713
561
5214
0021
727
b19
1433
120
222
0.07
9308
0.11
370
4.4
1.11
265.
40.
0709
73.
00.
8269
429
759
2995
762
73
b20
2337
997
1.16
1628
0.05
661
3.3
0.42
065.
80.
0538
84.
80.
5735
511
356
1836
610
897
b21
3280
147
80.
3256
670.
0525
82.
40.
3838
4.1
0.05
293
3.4
0.58
330
833
012
326
7610
1
b22
2828
611
339
0.08
1143
40.
3594
02.
24.
9767
3.6
0.10
043
2.8
0.61
1979
3718
1530
1632
5212
1
b23
4247
123
90.
1510
580.
0717
22.
40.
5877
7.0
0.05
943
6.6
0.34
447
1046
927
583
143
77
b24
2385
103
50.
0329
520.
0551
62.
70.
4058
4.6
0.05
335
3.7
0.60
346
934
614
344
8310
1
b26
1091
493
0.99
608
0.05
340
3.7
0.39
1410
.10.
0531
79.
40.
3733
512
335
2933
621
310
0
b27
1108
463
0.56
1294
0.05
322
2.9
0.38
935.
90.
0530
65.
10.
4933
49
334
1733
111
610
1
b28
3058
133
80.
8555
170.
0529
22.
40.
4082
4.3
0.05
594
3.6
0.55
332
834
813
450
8074
b29
4743
838
0.44
308
0.08
423
3.2
1.20
815.
50.
1040
24.
50.
5952
116
804
3116
9782
31
b30
881
402
0.79
496
0.05
740
2.9
0.42
715.
50.
0539
74.
60.
5436
010
361
1737
010
397
b31
3843
177
100.
3772
150.
0556
12.
20.
4126
3.9
0.05
381
3.2
0.56
349
735
112
363
7396
b32
2250
565
0.26
3807
0.09
124
2.6
0.75
025.
40.
0596
34.
70.
4956
314
568
2459
010
195
b33
6116
291
160.
3563
590.
0538
82.
70.
4048
3.7
0.05
448
2.6
0.72
338
934
511
391
5887
b34
4809
112
110.
2780
990.
1028
72.
00.
8498
3.2
0.05
991
2.5
0.62
631
1262
515
600
5410
5
b35
5112
254
130.
1335
540.
0539
65.
50.
4105
6.8
0.05
517
4.0
0.80
339
1834
920
419
9081
b36
1225
461
210.
8911
758
0.31
263
2.4
4.52
513.
30.
1049
82.
20.
7317
5437
1736
2817
1441
102
b37
1653
575
260.
5113
237
0.33
403
2.3
4.75
733.
10.
1033
02.
10.
7318
5837
1777
2716
8439
110
b38
4557
201
110.
1952
870.
0555
63.
10.
4095
4.4
0.05
346
3.2
0.69
349
1034
913
349
7110
0
b39
7762
4518
0.44
8403
0.39
391
2.3
5.07
114.
50.
0933
73.
80.
5221
4142
1831
3914
9572
143
b40
2097
824
0.34
1809
0.05
573
3.1
0.41
095.
40.
0534
74.
40.
5835
011
350
1634
999
100
b41
4323
127
90.
3076
890.
0745
93.
30.
5838
3.9
0.05
676
2.2
0.83
464
1546
715
482
4996
b42
6522
113
100.
4631
50.
0798
42.
21.
1290
6.7
0.10
256
6.3
0.33
495
1176
737
1671
117
30
b43
3213
120
70.
4459
720.
0600
21.
60.
4495
3.9
0.05
432
3.5
0.41
376
637
712
384
7998
b44
2849
965
0.35
1713
0.05
605
2.4
0.47
808.
20.
0618
67.
80.
2935
28
397
2766
916
853
b45
5597
117
90.
1421
530.
0787
73.
60.
6918
5.2
0.06
370
3.7
0.70
489
1753
422
732
7967
b46
2279
754
0.45
1143
0.05
145
2.7
0.38
785.
00.
0546
64.
20.
5332
38
333
1439
995
81
b47
1725
743
0.59
3165
0.04
071
3.1
0.30
876.
70.
0550
06.
00.
4625
78
273
1641
213
462
b48
1444
930
50.
9011
510.
1240
55.
22.
3142
6.5
0.13
530
3.9
0.80
754
3712
1747
2168
6835
b49
3993
113
60.
3846
560.
0513
32.
50.
4124
5.1
0.05
827
4.5
0.48
323
835
115
540
9960
b50
4384
686
0.82
1019
0.07
910
2.6
0.83
824.
50.
0768
63.
70.
5749
112
618
2111
1875
44
b51
5332
816
0.51
478
0.06
785
2.8
0.81
654.
80.
0872
73.
90.
5842
312
606
2213
6776
31
b52
1190
312
0.66
1949
0.05
486
3.1
0.40
595.
00.
0536
64.
00.
6134
410
346
1535
790
96
b54
1481
252
0.44
2704
0.08
385
2.8
0.64
065.
60.
0554
14.
80.
5051
914
503
2242
910
712
1
M. Hofmann et al.: The Upper Cretaceous section at Schmilka in Saxony (Elbsandsteingebirge, Germany)
120
Tabl
e 1
— S
k 4-
1 (S
ands
tone
c, P
oste
lwitz
For
mat
ion,
Upp
er T
uron
ian)
— 5
0° 54
′ 31.
5″ N
; 14°
14′ 1
7.1″
E,
mea
sure
d si
ngle
zirc
on g
rain
s: 1
16, c
onco
rdan
t with
in 9
0 – 11
0% o
f con
cord
ance
: 67
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
a168
833
21.
2710
930.
0497
93.
60.
3684
8.2
0.05
366
7.4
0.43
313
1131
823
357
167
88
a228
5713
77
0.11
4716
0.05
583
2.8
0.41
324.
70.
0536
73.
80.
6035
010
351
1435
785
98
a314
4269
40.
2727
220.
0546
63.
10.
4005
5.5
0.05
314
4.5
0.57
343
1034
216
335
102
103
a515
1373
40.
2028
320.
0577
82.
90.
4264
5.2
0.05
352
4.3
0.55
362
1036
116
351
9810
3
a681
529
20.
6612
970.
0763
53.
60.
5809
7.3
0.05
518
6.4
0.49
474
1646
528
420
143
113
a787
3441
150.
8285
750.
3067
03.
24.
3116
4.3
0.10
196
2.8
0.75
1724
4916
9636
1660
5210
4
a833
2617
510
0.34
6208
0.05
696
2.7
0.42
214.
50.
0537
43.
60.
5935
79
358
1436
082
99
a923
3311
17
0.21
3952
0.06
264
2.4
0.51
155.
30.
0592
24.
70.
4539
29
419
1857
510
268
a10
3048
159
90.
2257
280.
0564
03.
00.
4149
5.0
0.05
336
3.9
0.61
354
1035
215
344
8910
3
a11
1074
524
1.02
1865
0.06
349
2.5
0.50
469.
10.
0576
58.
70.
2839
710
415
3151
619
277
a12
5787
191
170.
1298
860.
0955
62.
70.
7787
4.1
0.05
910
3.1
0.65
588
1558
518
571
6710
3
a13
1238
664
0.87
1936
0.05
801
2.2
0.41
996.
00.
0524
95.
60.
3736
48
356
1830
712
611
8
a14
1066
564
1.15
2048
0.05
780
3.5
0.41
887.
80.
0525
66.
90.
4536
212
355
2431
015
811
7
a15
5799
154
140.
2553
430.
0911
63.
10.
7535
4.2
0.05
995
2.8
0.75
562
1757
018
602
6093
a16
1502
744
0.07
2785
0.05
664
3.4
0.42
225.
80.
0540
64.
60.
5935
512
358
1837
410
595
a17
3372
211
546
0.57
1066
60.
3580
54.
06.
4355
4.7
0.13
036
2.4
0.86
1973
6920
3742
2103
4394
a18
1778
975
0.43
1607
0.05
489
3.7
0.40
316.
30.
0532
65.
10.
5934
412
344
1834
011
510
1
a19
1022
056
527
0.13
1299
0.04
963
3.2
0.42
627.
30.
0622
86.
50.
4431
210
360
2268
413
946
a20
3503
499
0.50
5068
0.17
143
3.2
1.63
774.
60.
0692
83.
30.
7010
2031
985
2990
767
112
Tabl
e 1
— S
k 3-
1 (S
ands
tone
d, S
chra
mm
stei
n Fo
rmat
ion,
Low
er C
onia
cium
) con
tinue
d.
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
b55
2170
533
0.03
3937
0.05
731
2.6
0.43
874.
80.
0555
14.
00.
5435
99
369
1543
390
83
b56
2082
533
0.20
1731
0.05
516
3.2
0.42
446.
50.
0558
15.
60.
4934
611
359
2044
512
678
b57
2834
434
0.31
4859
0.08
230
3.6
0.66
996.
00.
0590
34.
80.
6051
018
521
2556
810
490
b58
2687
684
0.58
5203
0.05
938
2.0
0.42
854.
60.
0523
44.
20.
4337
27
362
1430
095
124
b59
4755
696
0.52
2158
0.08
388
2.9
0.69
956.
00.
0604
85.
20.
4951
915
539
2562
111
384
b60
1461
312
1.06
2514
0.05
262
3.8
0.41
687.
90.
0574
56.
90.
4833
112
354
2450
915
265
121
GEOLOGICA SAXONICA — 59: 2013
Tabl
e 1
— S
k 4-
1 (S
ands
tone
c, P
oste
lwitz
For
mat
ion,
Upp
er T
uron
ian)
con
tinue
d.
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
a21
743
402
0.12
1371
0.05
816
3.3
0.43
607.
70.
0543
87.
00.
4336
412
367
2438
715
794
a22
3455
196
110.
1333
870.
0578
52.
70.
4194
4.0
0.05
258
2.9
0.68
363
1035
612
311
6611
7
a23
1159
684
0.97
2202
0.05
115
3.6
0.37
166.
20.
0526
95.
10.
5832
211
321
1731
511
610
2
a24
7880
332
220.
1213
357
0.06
846
2.9
0.55
733.
80.
0590
42.
40.
7742
712
450
1456
952
75
a25
1288
724
0.42
2380
0.05
517
3.2
0.40
966.
60.
0538
55.
70.
4934
611
349
2036
512
995
a26
1796
996
0.33
3335
0.05
618
3.2
0.41
745.
50.
0538
94.
40.
5835
211
354
1736
610
096
a27
3421
201
100.
1164
850.
0541
22.
70.
3950
4.7
0.05
293
3.8
0.57
340
933
814
326
8710
4
a28
6056
360
200.
1868
520.
0569
54.
10.
4169
5.8
0.05
309
4.0
0.72
357
1435
417
333
9110
7
a29
9792
388
280.
0557
590.
0786
64.
30.
6203
5.5
0.05
719
3.4
0.78
488
2049
022
499
7698
a30
5254
194
160.
2564
330.
0822
22.
80.
6599
3.9
0.05
822
2.8
0.72
509
1451
516
538
6095
a31
1765
100
60.
8633
460.
0547
43.
70.
3989
5.1
0.05
286
3.5
0.73
344
1234
115
323
7910
6
a32
1446
524
0.75
2366
0.07
357
2.8
0.62
245.
80.
0613
65.
10.
4845
812
491
2365
210
970
a33
1208
210
924
0.31
3508
0.20
542
2.5
3.17
703.
60.
1121
72.
60.
7012
0428
1452
2818
3547
66
a34
3460
221
110.
2611
680.
0518
14.
30.
4205
6.1
0.05
886
4.3
0.71
326
1435
619
562
9458
a35
1924
118
60.
2834
980.
0512
33.
40.
3889
5.5
0.05
506
4.3
0.63
322
1133
416
415
9678
a36
9918
629
260.
3564
90.
0374
04.
20.
4193
5.2
0.08
132
3.0
0.82
237
1035
616
1229
5919
a37
1395
116
50.
6413
100.
0410
03.
60.
2990
6.3
0.05
290
5.2
0.56
259
926
615
324
118
80
a38
1538
865
0.74
2885
0.05
295
2.5
0.38
934.
70.
0533
23.
90.
5433
38
334
1334
289
97
a39
2613
134
70.
3749
140.
0553
63.
10.
4076
4.4
0.05
339
3.2
0.69
347
1034
713
346
7210
1
a40
3192
154
80.
1359
030.
0579
63.
30.
4296
5.5
0.05
376
4.4
0.60
363
1236
317
361
9910
1
a41
1315
474
210.
6010
754
0.24
065
3.8
3.85
105.
30.
1160
63.
70.
7113
9047
1603
4418
9667
73
a42
1891
865
0.55
2189
0.05
199
2.5
0.38
064.
30.
0531
03.
50.
5832
78
328
1233
379
98
a43
1141
513
0.88
2066
0.05
375
3.9
0.39
486.
40.
0532
75.
10.
6133
713
338
1934
011
599
a44
4797
195
110.
2173
910.
0569
52.
90.
4215
4.3
0.05
368
3.2
0.68
357
1035
713
358
7110
0
a45
1660
613
0.47
1373
0.05
476
3.4
0.41
985.
70.
0556
14.
50.
6134
412
356
1743
710
079
a46
1925
734
0.45
3538
0.05
593
3.0
0.42
065.
40.
0545
44.
50.
5635
110
356
1639
310
089
a47
1921
564
0.21
3334
0.07
127
2.4
0.57
155.
50.
0581
55.
00.
4444
410
459
2153
610
983
a48
604
201
0.14
1124
0.05
863
3.6
0.43
698.
90.
0540
48.
20.
4036
713
368
2837
318
499
a49
1132
392
0.93
2115
0.05
192
2.9
0.38
305.
70.
0535
14.
90.
5032
69
329
1635
111
193
a50
2279
593
0.40
648
0.04
954
7.7
0.50
2517
.20.
0735
715
.40.
4531
223
413
6010
3031
230
a51
1431
137
130.
6812
723
0.30
711
3.0
4.77
793.
80.
1128
32.
30.
7917
2645
1781
3218
4642
94
a52
2132
126
151.
3313
446
0.46
194
3.9
10.1
058
4.4
0.15
867
2.0
0.89
2448
8124
4542
2441
3510
0
a53
669
192
2.00
1258
0.05
736
3.4
0.42
278.
10.
0534
57.
30.
4236
012
358
2534
816
610
3
a54
1959
303
0.31
3244
0.08
951
3.1
0.74
795.
90.
0606
05.
00.
5255
316
567
2662
510
888
a55
9184
303
100.
1862
70.
0328
83.
50.
3486
5.2
0.07
691
3.9
0.67
209
730
414
1119
7819
a56
7651
146
1.19
3031
0.34
657
3.0
5.67
394.
20.
1187
42.
90.
7219
1850
1927
3719
3752
99
M. Hofmann et al.: The Upper Cretaceous section at Schmilka in Saxony (Elbsandsteingebirge, Germany)
122
Tabl
e 1
— S
k 4-
1 (S
ands
tone
c, P
oste
lwitz
For
mat
ion,
Upp
er T
uron
ian)
con
tinue
d.
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
a58
2217
563
0.35
4162
0.05
501
3.5
0.40
485.
40.
0533
74.
00.
6634
512
345
1634
591
100
a59
2278
393
1.04
4123
0.06
989
3.1
0.53
314.
80.
0553
23.
60.
6643
613
434
1742
580
102
a60
2424
583
0.44
4531
0.05
571
3.5
0.41
135.
50.
0535
44.
20.
6435
012
350
1635
294
99
b134
1291
70.
8461
260.
0681
72.
90.
5258
4.6
0.05
594
3.6
0.63
425
1242
916
450
7994
b230
1211
87
0.77
4204
0.05
499
2.6
0.40
635.
50.
0535
94.
90.
4734
59
346
1635
411
097
b330
2012
16
0.21
3617
0.05
373
2.4
0.40
004.
50.
0539
93.
80.
5333
78
342
1337
086
91
b536
6589
80.
4763
670.
0870
82.
50.
6943
4.6
0.05
782
3.9
0.54
538
1353
519
523
8510
3
b614
5453
30.
0227
180.
0556
82.
90.
4126
5.4
0.05
375
4.6
0.53
349
1035
116
360
103
97
b789
4524
616
0.11
6596
0.06
797
2.4
0.54
964.
10.
0586
53.
30.
5942
410
445
1555
472
77
b862
5725
514
0.22
1173
30.
0577
42.
80.
4291
4.3
0.05
389
3.2
0.66
362
1036
313
367
7399
b921
470
8728
0.70
2035
50.
2870
24.
94.
1337
6.1
0.10
445
3.6
0.80
1627
7116
6152
1705
6795
b10
4988
188
110.
2286
120.
0590
42.
00.
4718
4.4
0.05
796
3.9
0.45
370
739
214
528
8670
b11
8612
360
220.
3428
820.
0613
52.
10.
4853
3.7
0.05
738
3.0
0.57
384
840
212
506
6676
b12
2864
118
839
0.61
3224
40.
1902
72.
92.
3432
3.3
0.08
932
1.6
0.87
1123
3012
2524
1411
3180
b13
3035
137
70.
2141
890.
0503
72.
40.
3718
4.3
0.05
354
3.6
0.56
317
732
112
352
8190
b14
3290
144
80.
4062
360.
0520
92.
60.
3804
4.0
0.05
297
3.0
0.66
327
832
711
327
6810
0
b15
3179
129
70.
3523
880.
0534
22.
50.
4360
4.5
0.05
920
3.7
0.56
335
836
714
574
8058
b16
2388
975
0.19
4454
0.05
642
2.9
0.41
965.
40.
0539
44.
50.
5435
410
356
1636
910
296
b17
379
171
0.32
689
0.05
538
3.4
0.42
299.
20.
0553
88.
50.
3734
712
358
2842
819
081
b18
762
322
0.36
1421
0.05
869
2.8
0.43
526.
20.
0537
85.
60.
4536
810
367
1936
212
510
2
b19
897
362
0.15
1695
0.05
636
2.8
0.41
297.
30.
0531
36.
80.
3835
310
351
2233
415
410
6
b20
5271
147
120.
5292
160.
0800
62.
80.
6357
4.2
0.05
759
3.2
0.67
496
1350
017
514
6997
b21
1563
694
0.92
2646
0.05
105
2.4
0.41
626.
00.
0591
45.
50.
4032
18
353
1857
211
956
b22
4232
125
110.
4774
480.
0873
52.
40.
6894
4.0
0.05
724
3.2
0.59
540
1253
217
501
7110
8
b23
7385
7418
0.40
1030
00.
2442
12.
62.
4201
4.8
0.07
187
4.0
0.55
1409
3412
4935
982
8214
3
b24
2239
495
0.63
3734
0.10
328
2.8
0.85
914.
90.
0603
34.
10.
5763
417
630
2361
588
103
b25
3684
918
0.34
2815
0.09
201
2.8
0.77
644.
50.
0612
03.
60.
6256
715
583
2064
677
88
b26
7933
175
200.
6513
008
0.10
489
2.3
0.89
083.
70.
0615
92.
90.
6264
314
647
1866
063
97
b27
2018
945
0.61
3681
0.05
443
3.3
0.41
615.
60.
0554
54.
40.
6034
211
353
1743
099
79
b28
5335
262
130.
1630
280.
0505
82.
50.
4154
4.2
0.05
957
3.3
0.60
318
835
312
588
7254
b29
3739
177
90.
1269
320.
0564
82.
60.
4233
4.6
0.05
435
3.8
0.55
354
935
814
386
8692
b30
1301
614
0.49
2307
0.05
748
2.7
0.44
695.
90.
0564
05.
20.
4636
010
375
1946
811
677
b31
1459
704
1.08
2767
0.05
406
3.2
0.39
617.
10.
0531
46.
40.
4533
910
339
2133
514
510
1
b32
1955
102
60.
7615
170.
0534
62.
40.
3961
4.3
0.05
374
3.6
0.56
336
833
912
360
8193
b33
5595
310
150.
1246
310.
0521
84.
40.
3962
6.1
0.05
506
4.2
0.72
328
1433
918
415
9579
b35
2221
958
240.
4814
283
0.37
726
3.9
8.07
325.
50.
1552
14.
00.
7020
6369
2239
5124
0467
86
123
GEOLOGICA SAXONICA — 59: 2013
Tabl
e 1
— S
k 4-
1 (S
ands
tone
c, P
oste
lwitz
For
mat
ion,
Upp
er T
uron
ian)
con
tinue
d.
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
b36
2706
142
80.
2250
860.
0568
12.
90.
4205
4.6
0.05
369
3.6
0.62
356
1035
614
358
8210
0
b37
848
413
0.68
1664
0.05
966
2.3
0.42
186.
30.
0512
85.
80.
3737
48
357
1925
313
414
8
b38
3458
178
100.
4765
840.
0529
52.
80.
3846
4.4
0.05
268
3.4
0.64
333
933
012
315
7610
6
b39
2051
926
0.66
3887
0.05
732
2.8
0.41
664.
50.
0527
23.
60.
6135
910
354
1431
781
113
b40
6204
265
140.
1148
660.
0557
42.
30.
4165
3.6
0.05
420
2.8
0.65
350
835
411
380
6292
b41
2715
837
0.41
3048
0.07
814
2.4
0.59
024.
00.
0547
83.
10.
6148
511
471
1540
370
120
b42
1139
413
1.28
1008
0.05
790
2.8
0.47
439.
70.
0594
19.
30.
2936
310
394
3258
220
362
b43
3847
118
70.
1270
010.
0651
42.
10.
4997
4.5
0.05
563
4.0
0.46
407
841
115
438
9093
b44
1921
624
0.27
3469
0.06
250
2.3
0.47
444.
80.
0550
54.
30.
4739
19
394
1641
495
94
b45
1764
654
0.65
3305
0.05
337
3.8
0.39
026.
70.
0530
35.
50.
5733
512
335
1933
012
410
2
b46
4324
777
0.29
7044
0.09
656
3.2
0.82
646.
10.
0620
75.
20.
5259
418
612
2867
711
288
b47
2354
734
0.69
4007
0.05
312
2.2
0.40
544.
10.
0553
63.
40.
5433
47
346
1242
776
78
b48
6503
141
110.
5111
066
0.07
585
3.7
0.61
724.
60.
0590
22.
80.
8047
117
488
1856
860
83
b49
1316
382
0.52
2483
0.05
479
2.9
0.40
405.
40.
0534
84.
50.
5434
410
345
1634
910
298
b50
797
231
0.80
1520
0.05
501
4.5
0.40
287.
40.
0531
05.
90.
6134
515
344
2233
313
310
4
b51
1001
615
416
0.23
2891
0.10
534
2.9
0.79
838.
40.
0549
77.
90.
3464
618
596
3941
117
715
7
b52
1216
232
111.
1912
047
0.27
575
3.9
3.84
864.
60.
1012
22.
30.
8715
7055
1603
3716
4742
95
b53
5282
927
0.04
6306
0.07
991
2.2
0.66
224.
00.
0601
03.
30.
5649
611
516
1660
772
82
b54
2325
32
1.58
1832
0.36
791
6.4
6.46
339.
30.
1274
16.
80.
6820
2011
120
4185
2063
120
98
b55
2406
634
0.39
4370
0.05
787
2.2
0.42
854.
10.
0537
03.
50.
5436
38
362
1335
978
101
b56
3380
764
0.51
1522
0.05
542
2.2
0.52
094.
90.
0681
74.
40.
4434
87
426
1787
491
40
b57
2978
724
0.56
5726
0.05
668
2.9
0.40
945.
30.
0523
94.
50.
5435
510
348
1630
210
211
8
b58
615
121
0.38
1144
0.05
875
3.2
0.43
596.
50.
0538
25.
70.
4936
811
367
2036
412
910
1
b59
3217
754
0.15
6090
0.05
505
2.6
0.40
474.
70.
0533
14.
00.
5534
59
345
1434
290
101
b60
2672
603
0.39
4972
0.05
178
2.4
0.38
554.
30.
0539
93.
50.
5732
58
331
1237
179
88
Tabl
e 1
— S
k 5
(San
dsto
ne b
, Pos
telw
itz F
orm
atio
n, M
iddl
e Tu
roni
an) —
50°
53′ 4
7.4″
N; 1
4° 14
′ 15.
5″ E
, m
easu
red
sing
le z
ircon
gra
ins:
116
, con
cord
ant w
ithin
90 –
110%
of c
onco
rdan
ce: 6
9Is
otop
e ra
tiosc
Ages
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
]%
%[%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
%
a242
8076
31.
0367
00.
0394
42.
30.
3216
4.6
0.05
915
4.0
0.51
249
628
312
573
8744
M. Hofmann et al.: The Upper Cretaceous section at Schmilka in Saxony (Elbsandsteingebirge, Germany)
124
Tabl
e 1
— S
k 5
(San
dsto
ne b
, Pos
telw
itz F
orm
atio
n, M
iddl
e Tu
roni
an) c
ontin
ued.
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
a340
709
340
290.
3829
870.
0823
82.
30.
7120
2.6
0.06
269
1.4
0.85
510
1154
611
698
3073
a422
119
313
200.
9138
951
0.05
486
2.5
0.42
983.
10.
0568
21.
80.
8234
49
363
1048
539
71
a530
418
399
240.
1250
330.
0651
52.
20.
5022
2.5
0.05
591
1.2
0.88
407
941
39
449
2791
a619
768
289
150.
1528
010.
0542
22.
30.
3994
2.7
0.05
342
1.5
0.83
340
834
18
347
3498
a811
853
182
100.
3427
370.
0542
02.
70.
3998
3.8
0.05
350
2.6
0.71
340
934
211
350
6097
a910
817
111
90.
6534
880.
0764
22.
30.
6034
3.2
0.05
727
2.2
0.72
475
1147
912
502
4995
a10
1238
113
88
0.24
425
0.05
347
2.6
0.56
596.
90.
0767
66.
40.
3833
69
455
2611
1512
730
a11
2699
473
1.65
2796
0.04
935
2.5
0.37
713.
90.
0554
33.
00.
6431
17
325
1142
966
72
a13
9086
140
80.
6083
90.
0536
02.
40.
4918
6.7
0.06
654
6.3
0.36
337
840
623
823
131
41
a14
1992
629
817
0.28
1402
0.05
636
3.0
0.49
226.
70.
0633
46.
00.
4435
310
406
2372
012
849
a15
2545
423
1.28
484
0.05
724
3.0
0.51
284.
70.
0649
73.
60.
6435
911
420
1677
376
46
a16
5460
107
60.
6417
060.
0529
32.
50.
3842
3.4
0.05
265
2.3
0.74
333
833
010
314
5210
6
a17
9294
184
100.
3445
540.
0553
62.
30.
4087
3.0
0.05
354
1.9
0.77
347
834
89
352
4399
b247
1851
51.
4412
980.
0844
42.
80.
6810
4.3
0.05
849
3.3
0.66
523
1452
718
548
7195
b325
554
455
240.
1625
832
0.05
500
2.5
0.40
452.
90.
0533
51.
40.
8834
59
345
834
431
100
b541
0532
40.
6165
840.
1088
72.
90.
9342
4.8
0.06
223
3.7
0.62
666
1967
024
682
8098
b824
147
213
240.
8239
893
0.09
986
2.8
0.83
153.
20.
0604
01.
60.
8661
416
614
1561
835
99
b941
775
6824
0.95
6981
0.29
662
2.7
4.37
533.
10.
1069
81.
60.
8616
7540
1708
2617
4929
96
b10
1054
818
49
0.40
468
0.04
617
3.1
0.44
914.
60.
0705
63.
40.
6829
19
377
1594
570
31
b11
2070
527
316
0.32
1429
0.05
858
2.7
0.43
425.
30.
0537
64.
60.
5136
710
366
1636
110
310
2
b15
1708
120
913
0.46
503
0.05
635
2.8
0.61
255.
80.
0788
35.
00.
4935
310
485
2311
6810
030
b16
9641
312
745
0.76
281
0.28
513
3.1
3.84
033.
60.
0976
81.
80.
8716
1745
1601
2915
8034
102
b18
4969
475
0.50
8202
0.09
978
2.7
0.83
244.
30.
0605
03.
40.
6261
316
615
2062
273
99
b19
5091
565
0.74
1210
0.08
389
2.7
0.68
523.
70.
0592
42.
60.
7251
913
530
1657
656
90
b20
1036
920
411
0.35
5866
0.05
388
2.7
0.39
793.
50.
0535
62.
20.
7733
89
340
1035
350
96
b21
1733
1836
6520
20.
0939
890.
0499
12.
60.
3636
3.0
0.05
284
1.4
0.88
314
831
58
322
3398
b24
1455
717
916
0.64
3318
0.08
321
3.0
0.66
313.
50.
0577
91.
80.
8651
515
516
1452
239
99
b25
2788
831
425
0.30
1160
0.07
799
2.8
0.61
564.
70.
0572
43.
80.
5948
413
487
1850
183
97
b26
2243
0627
310
90.
6974
470.
3533
42.
66.
0646
2.8
0.12
448
1.1
0.92
1951
4419
8525
2021
1996
b27
4581
996
0.91
1693
0.05
563
2.7
0.41
464.
00.
0540
52.
90.
6834
99
352
1237
366
93
b28
5936
641
951
0.97
567
0.10
082
3.5
0.85
873.
80.
0617
81.
70.
9061
920
629
1866
636
93
b29
9323
173
110.
2037
350.
0633
62.
70.
4777
3.8
0.05
468
2.7
0.71
396
1039
713
399
6199
b30
7877
100
80.
2413
531
0.08
290
2.9
0.66
173.
70.
0578
82.
30.
7951
314
516
1552
550
98
b32
1820
348
140.
7476
940.
2608
42.
73.
3060
3.1
0.09
193
1.6
0.86
1494
3614
8225
1466
3110
2
b33
5023
111
82.
0636
670.
0537
72.
70.
3968
3.9
0.05
353
2.8
0.69
338
933
911
351
6496
b35
3165
694
0.91
5823
0.05
956
2.8
0.44
624.
20.
0543
33.
20.
6637
310
375
1338
572
97
125
GEOLOGICA SAXONICA — 59: 2013
Tabl
e 1
— S
k 5
(San
dsto
ne b
, Pos
telw
itz F
orm
atio
n, M
iddl
e Tu
roni
an) c
ontin
ued.
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
b36
8459
819
572
1.29
3061
80.
2961
62.
74.
0859
2.9
0.10
006
1.1
0.92
1672
3916
5124
1625
2110
3
b38
2075
437
521
0.77
1498
0.05
144
2.6
0.43
084.
80.
0607
34.
00.
5432
38
364
1563
086
51
b39
8529
102
110.
3740
230.
1069
53.
40.
8995
6.2
0.06
100
5.1
0.55
655
2165
130
639
111
102
b40
8020
792
390.
4710
793
0.39
144
2.6
6.91
942.
80.
1282
01.
10.
9221
3047
2101
2520
7319
103
b41
8050
140
80.
6184
260.
0538
22.
60.
3954
3.6
0.05
329
2.5
0.72
338
933
811
341
5799
b42
1728
618
917
0.37
2841
70.
0887
42.
90.
7137
3.6
0.05
833
2.2
0.80
548
1554
715
542
4710
1
b43
7530
787
0.74
3632
0.07
712
2.7
0.60
873.
60.
0572
42.
40.
7547
912
483
1450
152
96
b44
2960
422
0.42
1631
0.05
576
2.9
0.41
044.
70.
0533
83.
70.
6135
010
349
1434
584
101
b46
1158
978
90.
7418
996
0.10
695
2.7
0.89
874.
00.
0609
43.
10.
6665
517
651
2063
766
103
b47
1176
615
68
0.11
1714
40.
0557
82.
70.
4082
3.2
0.05
307
1.6
0.87
350
934
89
332
3510
5
b48
1139
114
47
0.03
9509
0.05
586
2.6
0.41
423.
30.
0537
92.
00.
7935
09
352
1036
246
97
b49
4068
503
1.40
3807
0.05
693
2.6
0.42
334.
40.
0539
33.
60.
5935
79
358
1336
880
97
b50
5166
263
0.60
6230
0.10
865
2.6
0.92
793.
80.
0619
42.
80.
6966
517
667
1967
259
99
b52
3431
210
126
0.76
357
0.25
475
6.9
3.25
358.
50.
0926
35.
10.
8014
6390
1470
6914
8096
99
b53
5905
503
0.21
8297
0.06
804
2.8
0.52
523.
90.
0559
82.
70.
7242
412
429
1445
260
94
b54
1486
016
58
0.18
8458
0.05
033
2.5
0.36
593.
20.
0527
32.
00.
7931
78
317
931
745
100
b55
4659
463
1.11
5443
0.05
469
2.7
0.40
754.
20.
0540
43.
20.
6534
39
347
1237
371
92
b57
1969
714
510
0.25
2872
90.
0677
03.
00.
5209
3.4
0.05
581
1.6
0.88
422
1242
612
445
3695
b58
5008
483
0.27
9235
0.05
568
2.8
0.41
593.
70.
0541
72.
50.
7434
99
353
1137
856
92
b59
1779
313
48
0.16
517
0.06
065
3.3
0.45
106.
00.
0539
34.
90.
5638
012
378
1936
811
110
3
b60
6355
329
118
0.07
430
0.06
288
2.9
0.47
854.
10.
0552
02.
80.
7239
311
397
1342
062
94
b62
2865
712
211
0.10
1000
00.
0951
12.
60.
7749
2.9
0.05
909
1.2
0.91
586
1558
313
570
2710
3
b63
8204
353
0.54
5050
0.09
407
2.7
0.76
963.
80.
0593
42.
80.
6958
015
580
1758
060
100
b64
4949
522
1.05
1804
0.03
787
2.5
0.27
644.
00.
0529
33.
10.
6324
06
248
932
670
74
b65
8495
163
0.79
4469
0.16
686
3.0
1.67
894.
10.
0729
72.
80.
7399
527
1001
2610
1356
98
b66
2708
110
912
0.99
4893
0.09
585
2.6
0.81
082.
90.
0613
51.
20.
9159
015
603
1365
225
91
c294
9012
811
0.53
1660
60.
0799
62.
00.
6382
2.6
0.05
789
1.6
0.78
496
1050
110
526
3594
c344
795
971
510.
2993
000.
0536
21.
40.
4022
1.9
0.05
441
1.2
0.76
337
534
35
388
2787
c482
9518
710
0.59
3017
0.05
071
1.9
0.38
873.
20.
0555
92.
60.
5831
96
333
943
658
73
c528
825
655
340.
2318
162
0.05
308
1.5
0.40
302.
00.
0550
51.
30.
7533
35
344
641
429
80
c675
1815
88
0.36
1258
0.05
082
2.0
0.42
063.
30.
0600
32.
60.
6032
06
356
1060
557
53
c769
1974
80.
5311
330
0.10
543
2.2
0.89
953.
70.
0618
72.
90.
6164
614
651
1867
062
96
c846
0490
50.
3979
130.
0604
62.
20.
4910
4.8
0.05
890
4.2
0.46
378
840
616
563
9267
c952
460
9542
1.52
1119
90.
3339
41.
85.
4271
2.4
0.11
787
1.6
0.75
1857
3018
8921
1924
2997
c11
2352
524
619
0.19
521
0.07
254
2.4
0.84
094.
90.
0840
74.
30.
4845
110
620
2312
9484
35
d210
6465
103
511.
0182
459
0.41
460
3.6
7.41
953.
70.
1297
90.
90.
9722
3668
2163
3320
9515
107
M. Hofmann et al.: The Upper Cretaceous section at Schmilka in Saxony (Elbsandsteingebirge, Germany)
126
Tabl
e 1
— S
k 5
(San
dsto
ne b
, Pos
telw
itz F
orm
atio
n, M
iddl
e Tu
roni
an) c
ontin
ued.
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
d331
680
118
621.
0061
140.
0194
03.
90.
1434
10.8
0.05
360
10.1
0.36
124
513
614
354
227
35
d492
7273
80.
4423
610.
1058
13.
90.
8907
5.0
0.06
105
3.1
0.79
648
2464
724
641
6610
1
d639
459
332
370.
8144
500.
0998
63.
50.
8608
4.1
0.06
252
2.2
0.84
614
2063
120
692
4789
d741
243
268
290.
2688
60.
1031
23.
51.
1788
3.9
0.08
290
1.7
0.90
633
2179
122
1267
3350
d812
149
227
140.
6335
730.
0589
03.
70.
4369
4.3
0.05
380
2.3
0.85
369
1336
813
363
5110
2
d915
496
152
161.
0529
890.
0848
43.
70.
7396
4.3
0.06
323
2.1
0.87
525
1956
219
716
4573
d11
1930
436
822
0.44
4279
0.05
973
3.6
0.44
574.
20.
0541
22.
20.
8537
413
374
1337
650
99
d13
2276
137
022
0.16
2348
0.06
061
4.0
0.51
564.
80.
0616
92.
70.
8337
915
422
1766
358
57
d14
1071
6520
874
0.89
7768
0.30
778
3.6
4.36
463.
70.
1028
51.
10.
9617
3055
1706
3116
7620
103
d15
1233
820
513
0.69
940
0.05
719
3.7
0.54
024.
90.
0685
13.
20.
7535
913
439
1888
467
41
d16
1469
531
217
0.18
4775
0.05
652
3.6
0.42
444.
10.
0544
62.
00.
8735
412
359
1239
045
91
d17
5791
107
71.
1812
210.
0570
93.
50.
4774
4.4
0.06
064
2.6
0.81
358
1239
614
627
5657
d18
6841
958
0.47
1185
10.
0851
43.
60.
6779
4.6
0.05
775
2.9
0.78
527
1852
619
520
6310
1
d20
1698
033
317
0.38
1221
0.05
053
4.2
0.36
018.
80.
0516
87.
80.
4731
813
312
2427
117
811
7
d21
1552
118
019
0.69
8071
0.09
431
3.7
0.78
884.
20.
0606
61.
90.
8958
121
590
1962
742
93
d24
1565
524
820
0.95
2303
0.06
796
3.7
0.56
354.
70.
0601
32.
80.
8042
415
454
1760
861
70
d25
2652
603
0.20
1211
0.05
965
3.7
0.44
215.
10.
0537
63.
50.
7337
313
372
1636
178
103
d27
8363
211
110.
3015
685
0.05
501
3.6
0.40
594.
10.
0535
12.
00.
8834
512
346
1235
044
99
d28
2381
273
0.45
3844
0.11
525
4.0
0.97
975.
00.
0616
53.
00.
8070
327
693
2566
263
106
d29
3774
939
528
1.24
109
0.05
002
4.4
1.31
226.
40.
1902
54.
70.
6931
514
851
3827
4477
11
d31
1222
815
719
1.96
3103
0.08
579
3.7
0.73
454.
30.
0620
92.
10.
8753
119
559
1967
745
78
d32
7338
209
120.
5459
680.
0547
33.
60.
4170
4.7
0.05
526
3.0
0.78
343
1235
414
423
6681
d33
4976
142
90.
9855
810.
0531
53.
60.
3924
4.3
0.05
355
2.4
0.83
334
1233
612
352
5395
d35
7516
188
100.
3716
920.
0518
24.
00.
4280
4.9
0.05
990
2.8
0.83
326
1336
215
600
6054
d37
6405
168
121.
3826
440.
0564
53.
50.
4375
4.8
0.05
621
3.3
0.73
354
1236
915
461
7377
d38
1869
142
0.87
358
0.12
734
3.8
1.50
968.
50.
0859
87.
60.
4577
328
934
5313
3814
658
d39
2779
644
0.17
5142
0.05
792
3.8
0.43
315.
30.
0542
33.
80.
7036
313
365
1738
185
95
d40
1277
012
916
0.60
4810
0.11
888
3.5
1.06
104.
40.
0647
32.
60.
8172
424
734
2376
654
95
d41
6278
135
80.
3581
730.
0585
93.
50.
4467
4.6
0.05
530
2.9
0.78
367
1337
514
424
6487
d43
6174
108
70.
4411
428
0.06
009
3.6
0.45
284.
80.
0546
53.
20.
7537
613
379
1539
871
95
d44
1166
920
912
0.18
4589
0.05
880
3.6
0.47
034.
40.
0580
02.
60.
8136
813
391
1453
056
70
127
GEOLOGICA SAXONICA — 59: 2013
Tabl
e 1
— S
k 6-
2 (la
biat
us S
ands
tone
, Sch
milk
a Fo
rmat
ion,
Low
er T
uron
ian)
— 5
0° 52
′ 28.
8″ N
; 14°
14′ 0
2.2″
E,
mea
sure
d si
ngle
zirc
on g
rain
s: 1
26, c
onco
rdan
t with
in 9
0 – 11
0% o
f con
cord
ance
: 41
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
a111
174
232
190.
5335
890.
0756
92.
60.
6390
3.4
0.06
123
2.2
0.76
470
1250
214
647
4873
a277
6725
011
0.27
937
0.04
134
3.6
0.41
765.
30.
0732
64.
00.
6726
19
354
1610
2180
26
a316
0257
30.
0821
430.
0570
03.
30.
4306
6.2
0.05
479
5.2
0.53
357
1136
419
403
116
89
a434
828
593
320.
3114
70.
0411
92.
40.
9600
5.4
0.16
902
4.8
0.44
260
668
327
2548
8110
a569
625
10.
9612
140.
0529
84.
50.
4226
6.7
0.05
785
5.0
0.67
333
1435
820
524
109
64
a685
6924
517
0.17
4394
0.07
378
2.4
0.60
843.
60.
0598
12.
60.
6845
911
483
1459
757
77
a714
5829
42.
2011
740.
0972
13.
00.
8084
6.8
0.06
032
6.1
0.45
598
1760
231
615
131
97
a815
233
251
330.
5060
580.
1272
05.
61.
1433
7.3
0.06
519
4.8
0.76
772
4177
440
780
100
99
a930
5157
70.
5092
40.
1168
13.
01.
1955
8.5
0.07
423
7.9
0.36
712
2079
948
1048
159
68
a10
416
161
0.47
751
0.06
167
4.4
0.46
689.
30.
0548
98.
10.
4838
617
389
3040
818
295
a11
4872
143
100.
1977
830.
0724
42.
20.
5832
3.6
0.05
839
2.8
0.62
451
1046
714
545
6283
a12
1931
395
1.10
803
0.11
098
3.5
1.02
376.
20.
0669
05.
20.
5567
822
716
3383
510
881
a13
2551
108
50.
0946
930.
0544
53.
20.
4126
6.0
0.05
497
5.1
0.53
342
1135
118
411
114
83
a14
1388
564
0.52
2587
0.06
073
2.8
0.45
597.
70.
0544
57.
10.
3738
010
381
2539
016
098
a15
1937
241
823
0.34
105
0.04
257
2.7
1.11
514.
30.
1900
03.
30.
6326
97
761
2327
4254
10
a16
2842
766
0.40
4302
0.07
487
2.5
0.60
764.
60.
0588
63.
90.
5446
511
482
1856
284
83
a17
1878
544
0.31
3262
0.08
024
2.8
0.64
094.
80.
0579
34.
00.
5749
813
503
1952
787
94
a18
5702
136
110.
6016
310.
0772
33.
50.
6954
6.5
0.06
531
5.4
0.54
480
1653
627
784
114
61
a19
9249
96
0.29
4227
0.59
549
4.4
17.9
278
6.4
0.21
835
4.7
0.69
3012
106
2986
6329
6975
101
a20
3021
144
70.
6455
500.
0458
46.
20.
3478
8.8
0.05
503
6.3
0.70
289
1830
323
414
141
70
a21
2782
130
70.
0250
870.
0584
52.
80.
4398
5.0
0.05
458
4.2
0.55
366
1037
016
395
9393
a22
884
753
0.69
772
0.03
388
7.0
0.25
3713
.00.
0543
010
.90.
5421
515
230
2738
324
556
a23
1895
485
0.32
3350
0.10
643
5.4
0.83
568.
90.
0569
47.
10.
6065
233
617
4248
915
713
3
a24
3489
182
110.
3464
650.
0620
74.
20.
4673
5.7
0.05
461
3.9
0.73
388
1638
919
396
8798
a25
4033
069
249
0.43
950.
0487
92.
11.
4349
2.7
0.21
329
1.6
0.80
307
690
416
2931
2610
a26
2770
154
90.
6656
100.
0536
82.
00.
3686
4.8
0.04
980
4.4
0.42
337
731
913
186
101
182
a27
668
353
1.70
1285
0.05
793
2.8
0.41
837.
80.
0523
77.
20.
3736
310
355
2430
216
512
0
a28
3252
226
463
0.47
8611
0.22
861
4.0
2.77
405.
40.
0880
13.
60.
7413
2748
1349
4113
8370
96
a29
2913
167
90.
2854
790.
0532
03.
40.
3921
5.3
0.05
346
4.1
0.63
334
1133
615
348
9396
a30
2537
758
229
0.21
970.
0345
73.
20.
9088
9.0
0.19
068
8.4
0.36
219
765
645
2748
139
8
a31
1561
575
0.45
2447
0.08
597
2.6
0.74
226.
10.
0626
15.
50.
4353
213
564
2769
511
876
a32
7622
3313
0.63
6681
0.36
283
3.5
5.77
245.
00.
1153
93.
60.
6919
9660
1942
4418
8665
106
a33
2760
121
90.
3648
140.
0723
02.
90.
5747
4.3
0.05
765
3.1
0.69
450
1346
116
517
6887
a34
6570
106
190.
6692
060.
1687
52.
71.
6722
3.5
0.07
187
2.3
0.75
1005
2599
823
982
4710
2
a35
2469
529
088
0.19
2480
0.31
134
3.1
3.74
226.
50.
0871
75.
70.
4717
4747
1580
5313
6411
012
8
a36
5430
196
160.
1737
840.
0835
13.
80.
7482
5.0
0.06
498
3.3
0.76
517
1956
722
774
6967
M. Hofmann et al.: The Upper Cretaceous section at Schmilka in Saxony (Elbsandsteingebirge, Germany)
128
Tabl
e 1
— S
k 6-
2 (la
biat
us S
ands
tone
, Sch
milk
a Fo
rmat
ion,
Low
er T
uron
ian)
con
tinue
d.
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
a37
3838
217
130.
6069
340.
0585
23.
30.
4503
5.0
0.05
581
3.8
0.66
367
1237
816
445
8382
a38
2056
715
0.43
3497
0.07
543
3.2
0.61
625.
40.
0592
44.
30.
5946
914
487
2157
694
81
a39
1017
033
724
0.21
3767
0.07
506
3.1
0.58
644.
00.
0566
62.
60.
7746
714
469
1547
857
98
a40
1714
405
0.82
2831
0.10
652
4.2
0.90
0110
.60.
0612
99.
70.
4065
326
652
5264
920
910
0
b135
1598
90.
2916
960.
0938
22.
10.
9355
5.6
0.07
232
5.2
0.36
578
1167
128
995
107
58
b241
6792
100.
8067
710.
0968
13.
80.
8162
5.1
0.06
115
3.4
0.74
596
2260
623
644
7392
b359
7214
716
0.94
2472
0.09
686
3.0
0.87
314.
30.
0653
73.
10.
6959
617
637
2078
665
76
b423
9897
60.
4619
310.
0591
23.
30.
4479
5.2
0.05
494
4.1
0.63
370
1237
617
410
9190
b514
5257
30.
3325
960.
0604
52.
60.
4690
5.3
0.05
627
4.7
0.48
378
1039
117
463
103
82
b622
6385
50.
0542
290.
0615
92.
60.
4585
4.9
0.05
399
4.1
0.54
385
1038
316
371
9310
4
b738
282
589
360.
4210
40.
0439
73.
01.
1944
5.2
0.19
703
4.2
0.58
277
879
829
2802
6910
b840
5225
111
1.04
7907
0.03
641
2.8
0.25
834.
20.
0514
53.
10.
6723
16
233
926
171
88
b926
8810
06
0.19
4783
0.06
087
2.5
0.47
415.
70.
0564
95.
10.
4438
19
394
1947
211
381
b10
3670
938
0.61
6442
0.07
976
2.3
0.63
083.
70.
0573
62.
90.
6149
511
497
1550
664
98
b11
4014
172
90.
3926
900.
0540
92.
80.
4075
4.5
0.05
463
3.5
0.63
340
934
713
397
7885
b12
4655
200
100.
3385
850.
0501
52.
50.
3759
4.1
0.05
436
3.2
0.61
315
832
411
386
7382
b13
1114
4617
666
0.34
8423
0.34
175
5.6
9.23
016.
10.
1958
82.
60.
9118
9592
2361
5827
9242
68
b14
5972
141
130.
1537
920.
0925
52.
30.
8761
6.8
0.06
866
6.4
0.34
571
1363
933
888
132
64
b15
1687
775
0.56
3225
0.06
143
3.4
0.44
477.
20.
0525
06.
30.
4838
413
374
2330
714
312
5
b16
1301
740
327
0.09
467
0.06
768
7.0
0.60
2420
.10.
0645
618
.90.
3542
229
479
8076
039
856
b17
2791
593
390.
8023
137
0.37
297
3.0
6.17
163.
90.
1200
12.
50.
7720
4354
2000
3519
5644
104
b18
2078
875
0.19
3977
0.06
265
2.6
0.45
415.
70.
0525
85.
00.
4639
210
380
1831
111
412
6
b19
4376
184
100.
5159
450.
0553
12.
80.
4308
5.2
0.05
648
4.3
0.55
347
1036
416
471
9674
b20
4506
157
100.
1081
590.
0658
22.
90.
5038
4.0
0.05
551
2.8
0.72
411
1241
414
433
6295
b21
2350
108
60.
3812
500.
0577
31.
90.
4263
5.8
0.05
355
5.5
0.33
362
736
118
352
123
103
b22
5610
4811
0.53
1456
0.21
815
3.2
2.35
673.
90.
0783
52.
30.
8112
7237
1230
2811
5646
110
b23
6473
173
120.
1136
420.
0676
82.
10.
6494
7.7
0.06
959
7.4
0.28
422
950
831
916
153
46
b24
6308
295
190.
4011
103
0.06
307
4.6
0.48
967.
00.
0563
05.
30.
6639
418
405
2446
411
785
b25
2651
112
70.
0311
510.
0654
13.
30.
4956
5.6
0.05
495
4.6
0.58
408
1340
919
410
102
100
b26
2299
109
60.
7239
090.
0554
12.
30.
4514
5.5
0.05
908
4.9
0.43
348
837
817
570
108
61
b27
5234
113
140.
6083
400.
1136
22.
90.
9923
4.8
0.06
334
3.9
0.60
694
1970
025
720
8296
b28
2950
239
90.
4319
210.
0349
42.
70.
2969
4.3
0.06
164
3.4
0.62
221
626
410
661
7333
b29
2398
880
330.
7188
610.
3710
87.
46.
4285
8.7
0.12
564
4.5
0.86
2034
131
2036
7920
3879
100
b30
6558
300
190.
7711
993
0.05
566
3.0
0.42
274.
20.
0550
72.
90.
7134
910
358
1341
566
84
b32
2118
106
60.
7139
650.
0557
82.
60.
4138
5.5
0.05
380
4.8
0.48
350
935
216
363
109
96
b34
7286
232
140.
1755
20.
0562
83.
80.
6775
5.2
0.08
731
3.5
0.73
353
1352
521
1367
6826
129
GEOLOGICA SAXONICA — 59: 2013
Tabl
e 1
— S
k 6-
2 (la
biat
us S
ands
tone
, Sch
milk
a Fo
rmat
ion,
Low
er T
uron
ian)
con
tinue
d.
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
b35
6791
371
210.
3630
900.
0589
15.
00.
4461
6.9
0.05
493
4.7
0.73
369
1837
522
409
106
90
b36
1160
238
718
0.38
268
0.03
998
3.2
0.60
686.
80.
1100
85.
90.
4825
38
482
2618
0110
814
b37
4956
244
130.
2221
940.
0550
72.
00.
4618
3.7
0.06
081
3.2
0.54
346
738
512
633
6855
b38
1213
310
225
0.72
1342
70.
2259
22.
22.
8129
4.2
0.09
031
3.6
0.53
1313
2613
5932
1432
6892
b39
2702
766
0.24
2192
0.08
163
2.8
0.62
825.
00.
0558
14.
20.
5650
614
495
2044
593
114
b40
1362
967
180.
3913
979
0.26
094
4.0
3.52
454.
40.
0979
61.
80.
9214
9554
1533
3515
8633
94
b42
3987
107
70.
2120
100.
0680
63.
10.
5504
5.2
0.05
865
4.2
0.60
424
1344
519
554
9277
b43
1076
223
012
0.29
182
0.04
482
1.4
0.78
595.
70.
1271
65.
50.
2428
34
589
2620
5997
14
b44
5953
130
110.
4817
790.
0831
82.
10.
7461
3.2
0.06
505
2.4
0.67
515
1156
614
776
5066
b45
2877
637
0.70
2603
0.09
917
1.8
0.79
764.
80.
0583
34.
50.
3761
010
595
2254
298
112
b46
1291
423
0.56
2214
0.06
416
2.6
0.52
266.
20.
0590
75.
60.
4240
110
427
2257
012
270
b47
1691
520
813
0.43
121
0.04
303
7.3
1.08
069.
80.
1821
46.
50.
7427
219
744
5326
7210
810
b48
3599
106
50.
1233
790.
0533
32.
70.
3890
4.2
0.05
289
3.2
0.65
335
933
412
324
7310
3
b49
1425
532
0.31
874
0.02
802
4.2
0.64
4910
.40.
1669
49.
50.
4117
87
505
4225
2715
97
b50
1152
362
0.97
458
0.04
943
3.3
0.58
9711
.90.
0865
311
.50.
2831
110
471
4613
5022
123
b52
3627
626
0.53
4163
0.08
640
3.6
0.71
664.
90.
0601
63.
30.
7553
419
549
2160
970
88
b53
4137
106
60.
2675
970.
0579
51.
60.
4376
4.6
0.05
476
4.3
0.35
363
636
914
403
9590
b54
3431
835
0.14
6081
0.05
877
3.2
0.45
815.
00.
0565
33.
80.
6436
811
383
1647
384
78
b55
5273
119
60.
0216
830.
0533
63.
50.
4373
5.2
0.05
944
3.9
0.66
335
1136
816
583
8557
b56
5848
734
0.51
269
0.05
136
4.6
0.73
749.
50.
1041
38.
30.
4932
314
561
4216
9915
219
b57
4187
985
0.20
3107
0.05
801
3.6
0.45
986.
50.
0574
85.
50.
5436
413
384
2151
012
071
b58
3070
334
1.05
4365
0.11
020
2.3
0.94
154.
60.
0619
63.
90.
5167
415
674
2367
384
100
b59
1324
314
65
0.30
970.
0239
54.
50.
6510
11.0
0.19
718
10.1
0.41
153
750
945
2803
165
5
b60
1610
152
1.00
1390
0.12
363
2.3
1.09
725.
50.
0643
65.
00.
4175
116
752
3075
410
610
0
c126
1848
60.
3632
470.
1301
73.
81.
2075
5.7
0.06
728
4.3
0.66
789
2880
432
846
8993
c225
9678
70.
1968
90.
0975
42.
60.
8850
9.0
0.06
581
8.6
0.29
600
1564
444
800
180
75
c352
6124
67
0.62
200
0.02
183
13.2
0.45
3616
.60.
1506
810
.10.
8013
918
380
5423
5417
26
c415
9867
50.
5028
320.
0719
52.
40.
5709
5.5
0.05
755
5.0
0.43
448
1045
921
513
109
87
c514
4371
40.
3115
840.
0579
13.
50.
4383
6.6
0.05
489
5.6
0.53
363
1236
921
408
124
89
c625
0611
27
0.36
4680
0.06
304
3.0
0.47
174.
90.
0542
73.
80.
6239
412
392
1638
286
103
c760
1917
013
0.33
1032
0.07
518
4.9
0.75
476.
50.
0728
14.
30.
7546
722
571
2910
0987
46
c827
0216
79
0.14
4893
0.05
890
1.9
0.44
436.
70.
0547
16.
40.
2836
97
373
2140
014
492
c922
3754
60.
4837
770.
1040
93.
90.
8652
5.4
0.06
028
3.7
0.72
638
2463
326
614
8010
4
c10
9746
212
1877
0.12
480.
0304
55.
81.
8122
6.5
0.43
167
2.8
0.90
193
1110
5043
4023
425
c11
6260
129
140.
2725
560.
1053
64.
21.
0668
7.2
0.07
343
5.8
0.59
646
2673
738
1026
118
63
c12
1675
374
0.81
2073
0.08
694
4.3
0.77
617.
60.
0647
56.
20.
5753
722
583
3476
613
170
M. Hofmann et al.: The Upper Cretaceous section at Schmilka in Saxony (Elbsandsteingebirge, Germany)
130
Tabl
e 1
— S
k 6-
2 (la
biat
us S
ands
tone
, Sch
milk
a Fo
rmat
ion,
Low
er T
uron
ian)
con
tinue
d.
Isot
ope
ratio
scAg
es
20
7 Pba
UbPb
bTh
/Ub
206 Pb
/204 Pb
206 Pb
/238 Uc
2 σ
207 Pb
/235 Uc
2 σ
207 Pb
/206 Pb
e2 σ
Rhod
206 Pb
/238 U
2 σ
207 Pb
/235 U
2 σ
207 Pb
/206 Pb
2 σ
conc
Num
ber
[cps
][p
pm]
[ppm
][%
][%
][%
]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[Ma]
[%]
c13
3870
189
110.
0370
830.
0650
43.
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713
998
a W
ithin
-run
bac
kgro
und-
corr
ecte
d m
ean
207 P
b si
gnal
in c
ount
s per
seco
ndb
U a
nd P
b co
nten
t and
Th/
U ra
tio w
ere
calc
ulat
ed re
lativ
e to
GJ-
1 an
d ar
e ac
cura
te to
app
roxi
mat
ely
10%
c C
orre
cted
for b
ackg
roun
d, m
ass b
ias,
lase
r ind
uced
U-P
b fr
actio
natio
n an
d co
mm
on P
b (if
det
ecta
ble,
see
anal
ytic
al m
etho
d) u
sing
Sta
cey
& K
ram
ers (
1975
) mod
el P
b co
mpo
sitio
n. 20
7 Pb/
235 U
cal
cula
ted
usin
g 20
7 Pb/
206 P
b/(23
8 U/20
6 Pb
× 1/
137.
88).
Erro
rs a
re p
ropa
gate
d by
qua
drat
ic a
dditi
on o
f with
in-r
un e
rror
s (2S
E) a
nd th
e re
prod
ucib
ility
of G
J-1
(2SD
)d
Rho
is th
e er
ror c
orre
latio
n de
fined
as e
rr20
6 Pb/
238 U
/err
207 P
b/23
5 U.