borehole ei 2 connecticut continuous lithologic logs of logging conventions used in the description...
TRANSCRIPT
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CGNHS OFR‐1987‐2 Connecticut Geological Survey
Department of Environmental Protection 79 Elm St., Hartford, CT
Moodus Borehole EI‐2 East Haddam, Connecticut 1000’ Continuous Drill Core
(‐72.457507 41.533805)
Lithologic Logs
Table of Contents
Introduction 2p.
Summary of Logging Conventions used in the Description of Core Materials 24p.
Detailed Lithologic Log (Ambers, 1987 after London, 1983) 1:12 100p.
Summary of Core 1p.
Total 129 pages
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INTRODUCTION TO THE MOODUS, CONNECTICUT,I000’, 1:12 BASEMENT DRILL CORE LOG
PREPARED BY: Clifford AmbersI afterDavid London~
llndlana UniversityBloomington, Indiana 47405
2Unlversity of OklahomaNorman, Oklahoma 73019
November, 1987
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SUMMARY OF LOGGING CONVENTIONSUSED IN THE DESCRIPTION OF COREMATERIALS FROM THE 4764’ DEEP
WELL AT MOODUS, CONNECTICUT; 1000’WELL AT M00DUS, CONNECTICOT; AND
1500’ WELL AT GILLETTE CASTLE, CONNECTICUT
PREPARED BY: Clifford Ambers
Indiana Un~vers~%yBlooming%on, Indiana 47405
Su~er - Fa~l, 1987
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AKNOWLEDGEMENTS
Th~e author would like to thank the eta%e of Connecticut ae
represented by Sidney Quarrier for %h~e unique oppor%un~%y
participate ~n %he state’s ~nqu~ry of ~t’s geologic materials.
Support provided by National Science Foundation grants NSF-EAR-
83-13807 and NSF-EAR-86-18305 made to Robert WJntsch
gratefully aknowledged. Finally, personal %hanke ~s due S~dney
Quarrier, David London, Robert W~ntech and Robert Altamura for
many fruitful discussions which helped greatly Jn the produc%Jon
of %h~s work.
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INTRODUCTION
The early summer 1987 drilllng of the Moodus, Connecticut
4764’ deep well made apparent the need for updating and
coordinating information relating to basement drilling
Connecticut. This document forms the basis for standardizing the
existing information on basement drilling in Connecticut,
allowing the relationships between the different wells to be
recognized.
Reexamination of all basement well materials was beyond the
scope of %his project so that various use was made of preexisting
descriptions of the materials. The new materials from the Moodus
4764’ well were completely examined and described. The core from
the Moodus I000’ well was reexamined in its entirety and editions
to the log prepared earlier by David London were made. The log
prepared by Robert Wintsch and John Bernitz for the Gillette
Castle 1500’ well was spot checked against the core to determine
its accuracy. It was determined to be sufficient for this
compilation and was redrafted.
The new logs were constructed in a form which was designed
1o allow rapid appreciation of various details of each core
section. In essence, a reproduction on paper of the actual
appearance of each core was %he goal. This was very well
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realized in the Moodus 4764’ 1:1 logs and sufficiently realized
in the Moodus 1000’ and Gillette Castle 1500’ 1:12 logs. Notes
accompanying each log section relating to lithology, fabrics and
mineral segregations add detail to the drafted columns. It is
very important to note that the core materlals considered in the
logs were not oriented when retrieved from their respective wells
and therefore the fabrics shown in the logs bear no relation to
the actual orientation of the features in the Earth except up and
down.
A step-by-step scheme is suggested for examination of the
log sheets which should aid in the total appreciation of each
section. This SUMMARY OF LOGGING CONVENTIONS should always be
available to consult when new symbols or abbreviations are
encountered. Check each symbol or abbreviation to become
fam~liar with each and do not assume that the meaning of a symbol
or abbreviation is obvious as it may not be even though the
attempt was made to make each symbol and abbreviation a reminder
of it’s meaning. When examining a new section, first note the
drafted fabrics and contacts of the section. Then note the
overall or host rock l~thology for the section offset to the far
right column with the key llthologies underlined. Each ma~or
break in fabric or l~thology has ~t’s host rock llthology
described and each of these major eubdlvisions of the logs is
shown by a thick lined break aligned in a centralized column in
the r~ght half of each page. Secondly, note details of the
litholog~es in the section placed a few spaces right of the log
column, adjacent to the layer or body in question. Finally,
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observe any specific fabric notes in the left half of the page.
These fabrics are typically low-grade overprinting fabrics, and
the fabrics shown by symbols on the log column usually are higher
grade ductile fabrics. This approach to the logs is similar to
the manner in which they were constructed and seems most useful.
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ABBREVIATIONS USED IN THE LOGS
Abbreviations were found to be a necessary tool in logglng
to help reduce time in logging and prevent clutter from too msny
words on a page. In the drafted logs they continue to help
reduce clutter. Three groups of abbreviations were used in
1ogglng and description: mineral abbreviatlone, general
descriptor abbreviatlons, and fabric abbreviations. An
alphabetlzed llsting of each of these groups is provlded here.
Mineral Abbreviations
Mineral abbreviations are most often the flrst part of a
mineral name, but not always. These abbreviatlons are not all
standard but were chosen to most easlly remlnd one of the mineral
in question.
act actlnolite
blot biotite
chl chlorite
cpx clinopyroxene
diop diopside
ep~d epidote
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M~neral Abbreviations cont.
fspar or F feldspar
grit garnet
hbl hornblende
Kspar or K potassium feldspar
mgt magnetite
muse muscovite
plag or P plag~oclase
pyr pyrite
qtz or q quartz
s~ll s~ll~manite
General Abbreviations
Abbreviations of repeatedly used words were chosen to
resemble the word ~n question. Again, use of these abbreviations
resulted ~n less written mater~al on each page which ~ncreased
the clarity of the log.
acc accessory
alt altered, alteration
apprec appreciable
blast porphyroblast
blast~c porphyroblastic
dk dark
d~am d~ameter
d~ss d~ssem~nated
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General Abbreviations con~.
frag(s) fragments, fragment
it light
med medium
MFS mean fragment size(chlp descriptions only)
mod moderate, moderately
seg segregation
tr trace
v very
w/ with
Fabric Abbreviations
Along with the symbols for fabric shown in the log columne,
abbreviations were also used for fabrics in written descriptions
where these were necessary. These abbreviations are summarized
here.
fol
gfsc
gns
1~n
myl
phyll
sch
vein or V
fo1~ated, foliation
granofe~sic
gneiss, gnelssose
iinea%ed, lineat~on
my~onit~c
phyllitic
segregation, always prefixed byone or more m~neral abbrev~atlon(s)
schist0 schistose
vein f~led w~th a given m~neral
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LITHOLOGIC DESCRIPTIONS
Throughou% all of %he logs and the ch~p descriptions from
the Moodus 4764’ wet1, abbrev~a%~ons for lltholog~es are used %0
des~gna%e %he rock %ype ~n a certain ~nterval. Accompanying many
of %he abbrev~a%~ons ~n the logs are modifiers which ~nd~ca%e any
deviations from %he genera1~zed descr~ptions of %he 1~%hologies
g~ven hel-e. Fam~1~ar~zat~on w~th %hess def~n~%~ons ~s crucial ~n
unders%and~ng %hess logs end ch~p descr~p%~ons.
An ~mpor%an% no%e ~s %ha% %erms %rad~%~onally reserved for
fault rock fabric have occas~onally been used ~n %he
descr~p%~ons of core and chip ~%holog~es because of the
~nab~1~ty %0 properly describe %he m~neralogy of %he rock ~n hand
specimen. Such "rock %ypes" ~nclude m~crobrecc~a =
m~croca%aclasi%e, u1%ramylon~%e, mylon~%~c sch~s%, phyllon~%e,
and pseudo%achylli%e.
alask (alaska%e)
subequal qtz, plag, Kspar
accessory b~o%, mg%, hema%~%e
%yp~cally fleshy p~nk ~n color
grain s~ze varies from .5 - 1.5 mm.
generally mod-well fo1~a%ed and gne~ssose
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(amphibo/ite)
hbl 50 - 100~
plag 0 - 50~
blot 0 - 30 ¯
accessory apatite, pyrite, mgt, cpx
black, brown-black to dk greenish black in color
grain size varies from 1 - 3 mm.
generally mod-well follated gneissose to schistose
(aplite)
subequal qtz and plag, sometimes w/ minor Kspar up to 10~
accessory biotite up to a few percent
v. lt. gray to cream to white in color
generally < 1 mm. grain size
usually gneissose w/ recovered sucroslc grains
a common vein material in the Hebron Gneiss
BAS (biotite amphibole schist)
blot 50 - lO0g
green amphibole usually act i0 - 50~
plag 0 - 20~
accessory tremolite, scapolite, pyr
dk. greenish brown to black in color
up to 2 mm. grained
schistose to myl schistose fabric
often cuts host rock follation at a low anglecommon in the Hebron Gneiss
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BGG (biotite granitic gneiss)
subequal gtz, plag, kspar
bEot at least 5~ up to 10~
acceseory muec, pyr, gnt
It - med gray to pink ~n color
usually even grained from 1 - 2 mm.
poorly to well folEated and l~neated, gneissose
largely restricted to layered granEtlc ~ntrusJons within theHebron Gneiss
BHG (biotite hornblende gnelss)
plag 50 - 90~
qtz 0 - 30~
hbl 0 - 50~
b~ot 0 - 30~
accessory ephene, mgt, epid, Kspar
med - dk gray in color
even to irregular grained .5 - 4 mm.
poorly - well foliated and lineated, gne~eeose
abundant lithology in the Avalon Terrain
b~ot 50 - 80~
hbl 20 - 50~
accessory ephene, mgt, plag
(b~otite hornblende schlst)
(sometimes ~mportant)
dk. green black to black in color
variably grained .5 - 3 mm.
well foiEated myl schistose fabrlc
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BMS (biotite mylonitic schist)
blot 30 -
qtz 30 - 50~
plag I0 -
accessory musc,..gnt, sill, apatite, pyr
medium - dk brown in color
highly variable grain size, .5 - 5 mm.
always v. well foliated myl sch fabric
segregations of qtz and qtz-fspar are commona common rock type in the Honey Hill Fault zone
BPG (biotite plagloclase gneiss)
plag 70 - 90~
qtz 0 - 30~
blot < 5~ but always present
Kspar 0 - 20~
it - med gray in color
even grained from .5 - 1.5 mm.
mod - well foliated and lineated, gneissoseoften laminated
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LGG
biot
qtz
plag
Kspar
(biotite quartz plagioclase schist)
30 - 70~
20 - 30~
20 - 30~
0 - 15~
accessory hbl, diop, gnt, musc,
med - dk brown in color
fairly even grained .5 - 2 mm.
schistose fabric
varies from markedly biot-rich to plag-richcommon lithology in the Hebron Gneiss
scap, pyr, calcite
(leucogranitic gneiss)
a very similar lithology to BGG already described exceptthat this litholo~y contains <5~ biotite and is often muscbearing, is always white or it. gray, and is sometimesfairly uneven grained
a v. flne rock with characteristics like those describedlater in the fabric symbols, which is commonly composed ofKspar, chl, qtz, mgt and ground host rock as determined bySEM backscatter imagery
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MMS (muscovite mylonltic schist)
musc 20 - 50~
chl or biot i0 - 30~
qtz 20 - 40~
accessory plag, Kspar, pyr, grit
med green gray to brown gray to silvery white in color
h~ghly variable grain size, .5 - 5 mm.
always well follated myl ech fabric
commonly w/ QS or QFS
myl sch (mylonit~c schist)
a general name for rocks w/ myl sch fabric and having uniquemineralogy, myl sch fabric is described later in the fabricsymbols
PBS (plag~oclase biotite schist)
plag 10 - 30~
b~ot 50 - 90~
qtz up to 10~
accessory hbl, diop, muse, Kspar, gnt, soap
dk. brown to black in color
highly variable grain s~ze .5 - 5 mm.
well foliated schistose to my1 sch fabric
this llthology commonly truncates foliatione ~n the hostlithoiogy at a low angle, common in all rock units
pe_qmatite
a vein-type llthologywith extremely variable and unevengrain size from .5 mm. to 3 cm. commonly contains qtz,plag, and Kspar in highly variable proportlons withaccessory biot, musc, tourmaline, gnt, chl, sulfide
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a phyllitlc appearing rock of variable m~neralogy, buttyp~oally chl-musc-rlch, th~s fabric is described later inthe symbol description section
qtz
plag
diop 10 - 30~
accessory act, soap,gnt
(quartz dlopslde granofels)
30 - 60~
20 - 30~
calcite, blot, tourmaline,
med greenish gray to green in color
even to variably grained .5 - 4 mm.
granofelstc to poorly foltated gneissose fabric
restricted almost entirely to the Hebron Gneiss
sulflde,
(quartz feldspar segregation)
a thin, discontlnuous vein material of variable grain s~ze.5 - 10 mm. and composed entirely of quartz and feldsparmost often plag. often occurs in h~ghly deformed zones
(quartz segregation)
a thin, discontinuous pure quartz veinlette.in highly deformed zones
often occurs
(vein quartz)
a planar, often quite thick, body of pure quartz
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LOG SYMBOLS AND SHEET ORGANIZATION
The following sheets are the guide to all of the symbols,
most of them fabric related, used in v~sually representing the
cores considered in th~s project. Most of the symbols were
independent of log scale (1:1 vs. 1:12) and these are given
first. Some symbols did vary with log scale or were better
represented on the log sheets, and are presented on actual log
sheets. The description of the sheet organization is presented
on the last 1:12 log sheet in a form s~milar to the instructions
for GSA abstract format.
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Micro- to cryptocrystalline black rock sometimes bearingminute mineral fragments. Fluidal characteristics areshown 6y intrusion of material into dikelettes off thickerdikes. Origin of this material is probably fault relatedas microbrecciation often accompanies this material. Mayinclude ultramylonites, microbreccias and pseudotachyllites.
Microbreccia having rock and minera! fragments visible witha IOX hand lense or greater magnification. Cements aregiven in the logs where they are discernable, but color isoften the only indication of mineral content: green =chl and/or epid, black = mgt, brown biot.
Breccia having rock and mineral fragments visible withthe naked eye. Cements are given in the logs wherethey were discernable.
Mylonitic Schist (a). Very micaceous (greater than 30%)rock having clearly anastomosing foliation and lensoidfabric. Commonly exhibits "S-C" fabric. Blasts of plagand muscovite are common, but less than I0%. QS and QFSare very common and often abundant in zones with this fabric.
Blastomylonitic Schist (b). Identical fabric as (a), butbearing greater than 10% porphyroblasts.
Crenulated Schist. Very micaceous rock with wel!developed crenulation observable in hand sample.Commonly in chl-musc schists.
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Phyllonite. Mica-rich (commonly chl-musc) rock withindividual grains barely visible with a hand lense(that is phyllitic in appearance). In thin sectionthese zones show highly anastomosing fabric indicativeof shearing.
Ultramylonite. Ultra-fine grained rock of greatvariety of color resembling chert or flint. A streakyfoliation is visible only as cblor variation, and thinless than 1 mm. partings are common parallel to the colorbands. In thin section, minute feldspar clasts are visible.This fabric is commonly developed in low biotite and qtzrocks.
Augen Gneiss. Quartzofeldspathic rock usually metaigneousin origin bearing augen of feldspar in a finer grainedgroundmass of qtz, fspar, and some mica. The gneissosefoliation in the rock is anastomosing and lensoid (myl).Pegmatites, BHG, and BGG commonly have this fabricdeveloped.
Straight gneiss. Gneiss bearing high grade mineralogy andoften being migmatitic with extremely planar foliation andquartzofeldspathic and micaceous laminae 1 - 3 mm. thickthat extend for several meters when observed in outcrop..Where migmatitic, the leucosomes are in strong par.allelismwith laminae. Feldspar blasts up to several centimetersin diameter are common but not abundant enough toconstitute an augen gneiss.
Spotted Plagioclase Blast Granofels. The recently described"blastocataclasite" of Wintsch (1985), which is describedas a high grade brittle fabric overprinted by ductile shear.The rock is of unique character being biotite and sometimesmuscovite rich with abundant (I0 - 50%) plag blasts,generally not augen in shape. The micas are often veryweakly foliated in a mylonitic fabric, but the overallappearance of the rock is granofelsic. This fabric oftentruncates host rock foliations at low angles.
Quartz Vein Filling. Planar layers filled with v’s areinterpreted as veins and discontinuous lenses, pods andlayers are considered as segregations.
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Mineral rosettes on some surface. Commonly exhibitedby tourmaline on the walls of a vein.
Quartzofeldspathic Vein Material. X’s stand for feldsparthe variety of which is usually given, but if not is likelyplagt V’s stand for quartz. Planar layers are consideredveins, and the type is given. Irregular bodies are seg-regations and often have no descriptors.
Feldspathic Vein Material. Uncommon feldspar veins werenoted as well as segregations. The feldspar type is alwaysgiven.
Single Plagioclase Grains.twinning, this symbol wasMoodus 4764’ I:I logs.
Designed to suggest albiteentirely restricted to the
Single Microcline Grains. Designed to suggest tartantwinning in mierocline, this symbol was entirely restrictedto the Moodus 4764’ I:I logs,
Fractures And Thin Fabric Elements. Jagged lines indicaterough fractures in the core and straight lines indicatesmooth breaks in the core or less than 1 cm. thick fabriclayers which are always described (usually in the lefthalf of the log page). Unaltered fractures are not notedexcept in the MOodus 4764’ logs. Alterations along fracture~are always listed.
ig
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Dark Mineral Segregations. Tourmaline and hornblendewere found in a few places in pod-like segregations thatrequired a unique symbol. The mineralogy of thesegregations are always given,
Mineral Concentration Zones. Dotted outlines definethe perimeter of a diffuse mineral segregation, themineral always given. A stippled p~ttern defines theregion of a unique disseminated mineral.
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o
o o o
o
H
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o
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I I I I I~
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~ o ~
~ 0
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