Leg : 36 Top/Bottom Interval(mm): 0/ 0 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 547.00 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 550.10 Sect/Pc #: CC/PCE 3
ROCK = CALCITIZED GNEISS
METAMORPHIC ROCK;
Groundmass - QUARTZ ( 40%)
CALCITE ( 40%)
BIOTITE ( 15%)
PYRITE ( 5%)
PROPORTION OF CALCITE HIGHER THAN IN 16-1 (#1),
ESPECIALLY BORDERING PEGMATITE VEIN. QUARTZ
GRAINS MORE SEPARATED AND OBVIOUSLY PULLED APART.
PARENT GRANULITE PROBABLY MORE PELITIC THAN IN
16-1 (#1): CONFIRMED BY HIGHER BIOTITE-CHLORITE
CONTENT IN THIS SLIDE. "CHLORITE" IS NOW TRUE
CHLORITE THAN GREEN BIOTITE. FABRIC IN MICAS MORE
DISTURBED; QTZ ORE-TRAILS NOT SO CONSISTENT
(BUT STILL PERPENDICULAR TO MICA FABRIC) SUGGESTING
GRAINS HAVE BEEN ROTATED. TRAILS IN PEGMATITE
QUARTZ MORE COMPLEX. BOTH SODIC PLAG AND K-FELD
IN PEGMATITE ONLY PARTLY REPLACED BY CALCITE -
BOTH PROBABLY MORE RESISTANT THAN MORE CA-RICH
PLAG IN GRANULITE. SERICITE STILL RECOGNIZABLE.
THIN CROSS-CUTTING QUARTZ VEINS STILL VISIBLE.
QUARTZ OBVIOUSLY UNAFFECTED BY CALCITIZATION.
PYRITE CONTENT LOCALLY QUITE HIGH,FOLLOWS
PRE-EXISTING CARB VEINS?*
Leg : 36 Top/Bottom Interval(mm): 0/ 0 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 547.00 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 550.10 Sect/Pc #: CC/PCE 3
ROCK = PEGMATITE;
Groundmass - QUARTZ ( 60%)
CALCITE ( 30%)
KFELDSPAR ( 5%)
ALTERED;
PYRITE ( TR%)
ZIRCON ( TR%)
OTHER ( TR%)
ORE?*
Leg : 36 Top/Bottom Interval(mm): 180/ 220 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 556.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 556.70 Sect/Pc #: 1/PCE 1
ROCK = CALCITIZED GNEISS;
Groundmass - QUARTZ ( 50%)
BIOTITE ( 10%)
BROWN AND GREEN;
CALCITE ( 35%)
PYRITE ( 3%)
CHLORITE ( 2%)
AMOUNT INCLUDES "OTHER OPAQUES";
PLAGIOCLASE ( 0%)
FINE-GRAINED CALCITE HAS REPLACED PLAG LEAVING
GRANULAR TEXTURE OF ROCK UNDISTURBED. QUARTZ
GRAINS HAVE BEEN PULLED APART, BUT ONLY SLIGHTLY,
PROBABLY LITTLE SOLUTION OF QTZ. BIOTITES
ARRANGED IN NEAR-EQUIDIMENSIONAL
AGGREGATES SUGGESTING THEY HAVE REPLACED
SOME EARLIER EQUANT MINERAL. NEVERTHELESS
BIOTITE LATHS DEFINE FAIRLY GOOD FABRIC.
ORE TRAILS IN QUARTZ PROMINENT AND
CONSISTENT THROUGHOUT SECTION -
BETRAYS PRE-EXISTING FABRIC OVERGROWN
BY QUARTZ?, BROWN BIOTITE VARIABLY REPLACED BY
GREEN BIOTITE WITH EXSOLVED ORE AND
QUARTZ; SOME GREEN BIOTITE/CHLORITE MAY
REPRESENT REPLACED GARNETS;FABRIC OF ORE
TRAILS IN QUARTZ PERPENDICULAR TO BIOTITE
FABRIC*
Leg : 36 Top/Bottom Interval(mm): 0/ 0 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 556.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 556.50 Sect/Pc #: 1/PCE 2
ROCK = CALCITIZED GNEISS
ENCODED FROM P. 894, IR;
Groundmass - QUARTZ ( 60%)
BIOTITE ( 10%)
CALCITE ( 30%)
Leg : 36 Top/Bottom Interval(mm): 340/ 360 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 556.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 556.85 Sect/Pc #: 1/PCE 3
ROCK = CALCITIZED GNEISS;
Groundmass - QUARTZ ( 50%)
KFELDSPAR ( 5%)
CLOUDY;
BIOTITE ( 8%)
DEGRADED,GREEN;
CALCITE ( 35%)
OPAQUE MINERALS ( 2%)
QUARTZ GRAINS BOTH PULLED APART AND BEING
REPLACED BY CALCITE. SOME OBVIOUSLY SPLIT;
OTHERS CORRODED IRREGULAR BORDERS. CALCITE IN
LARGE, WELL XTLLIZED AREAS TO 1 CM IN SIZE,
SINGLE XTLS POIKILITICALLY ENCLOSING QTZ,
ETC. KSPAR FORMS CLOUDED XTLS; ALSO SPLIT AND
REPLACED BY CALCITE. SOME XTLS HAVE CLEARER
MARGINS. BIOTITE MUCH DEGRADED INTO PALE
GREEN IRREGULAR XTLS/AGGREGATES BUT STILL
OPTICALLY BIOTITE RATHER THAN CHLORITE. ONE
PARTIALLY REXTLLIZED FROM DEGRADED BIOTITE,
XTLS HAVE SMALL END RIMS. A FEW AGGREGATES
OF SMALL COLORLESS LATHS, LOW R.I., 40%
EXTINCT.,FIRST ORDER COLORS - GYPSUM?, NO
PLAG RECOGNIZED*
Leg : 36 Top/Bottom Interval(mm): 0/ 0 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 556.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 556.50 Sect/Pc #: 1/PCE 4
ROCK = GRANULITIC GNEISS
ENCODED FROM P. 894, IR;
Groundmass - QUARTZ ( 60%)
PLAGIOCLASE ( 30%)
BIOTITE ( 10%)
PYRITE ( TR%)
Leg : 36 Top/Bottom Interval(mm): 540/ 560 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 556.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 557.05 Sect/Pc #: 1/PCE 7
ROCK = PEGMATITE VEIN;
Groundmass - KFELDSPAR ( 70%)
QUARTZ ( 20%)
PLAGIOCLASE ( 2%)
BIOTITE ( 2%)
ALTERED;
CALCITE
MAY BE MORE THAN 8 VEINS,SAME MUCH VEINED
BY CALCITE, UNSUITABLE FOR AGE DATING,
KSPARS ARE UNTWINNED, OF POOR R.I. AND
LOW BIREFRINGENCE AND APPARENTLY ALMOST
UNIAXIALLY - VE (?SANIDINE), TWO PERTHITE
LAMELLAE FORM LARGE XTLS >0.5 CM DIAMETER.
PLAG AND QUARTZ MUCH SMALLER XTLS. BIOTITE
COMPLETELY TRANSFORMED TO VERY PALE GREEN
CHLORITE. WELL XTLLIZED CALCITE IN VEINS.
WHERE CALCITE VEINS CUT KSPAR HAVE CAUSED
REXTLLIZATION TO SMALLER MORE HIGHLY
BIREFRINGENT XTLLITES, ALMOST OPTICALLY
CONTINUOUS WITH HOST. WHERE CALCITE VEINING
MORE PERVASIVE, CURIOUS MOSAIC-STYLE GRANOPHYRIC
INTERGROWTH BETWEEN KSPAR AND QUARTZ ON MICRO-
SCALE*
Leg : 36 Top/Bottom Interval(mm): 1040/1060 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 556.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 557.55 Sect/Pc #: 1/PCE 13
ROCK = GRANULITIC GNEISS;
Groundmass - QUARTZ ( 70%)
KFELDSPAR ( 10%)
BIOTITE ( 10%)
BROWN AND GREEN;
MAGNETITE ( 2%)
SIDERITE ( 2%)
GARNET ( TR%)
CALCITE ( 6%)
QUARTZ-RICH GNEISS, SLIGHT FABRIC IN
ALIGNMENT OF QUARTZ GRAINS. BIOTITE
ALIGNED PARALLEL TO FOLIATION, BUT AGGREGATES
HAVE NO GREAT ELONGATION. BROWN AND GREEN
VARIETIES INTERGROWN. CLOUDED GRAINS SEEM TO
BE KSPAR (UNIAX -VE), HIGH R.I. GRAINS
SIDERITE. ORE IS IMPORTANT PRIMARY COMPONENT,
ALTHOUGH MUCH SECONDARY ORE FORMS REPLACEMENT
TO BROWN BIOTITE BY GREEN. SMALL GARNET GRAIN
PROBABLY REMNANT OF MUCH LARGER MASS PARTLY
REPLACED BY GREEN BIOTITE*
Leg : 36 Top/Bottom Interval(mm): 1430/1460 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 556.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 557.95 Sect/Pc #: 1/PCE 20
ROCK = GRANULITIC GNEISS;
Groundmass - QUARTZ ( 55%)
PLAGIOCLASE ( 25%)
KFELDSPAR ( 10%)
BIOTITE ( 10%)
ZIRCON ( TR%)
OPAQUE MINERALS ( 1%)
MOST OF PLAG BADLY CLOUDED, REPLACED BY CARB,
SOME FRESH XTLS APPROX AN35, KSPAR UNTWINNED,
VERY SMALL 2V,QUARTZES SLIGHTLY FLATTENED
TO BIOTITE FOLIATION, BUT MANY ADJACENT GRAINS
OPTICALLY CONTINUOUS OR NEARLY SO. .. MAKE
LARGER GRAINS ELONGATE PERPENDICULAR TO BIOTITE
FOLIATION . . PARALLEL TO ORE TRAILS IN QTZ*
Leg : 36 Top/Bottom Interval(mm): 40/ 80 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 556.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 558.06 Sect/Pc #: 2/PCE 1
ROCK = GARNET BIOTITE GNEISS;
Groundmass - BIOTITE ( 90%)
AMOUNT INCLUDES ALTERATION PRODUCTS;
GARNET ( 10%)
AMOUNT INCLUDES ALTERATION PRODUCTS,
GARNET STILL PRESENT IN PATCHES, MAY HAVE
FORMED AT LEAST 10% OF THE ROCK.NOT ALL
BIOTITES ARE ALIGNED PARALLEL TO FOLIATION,
MAY HAVE GROWN ONLY UNDER WEAK STRESS.
GARNETS PARTLY REPLACED BY SIDERITE OR FINE-
GRAINED GREEN, ALMOST ISOTROPIC CHLORITE.
MUCH FINE-GRAINED SERICITIC MATERIAL AND CALCITE
VEINS*
Leg : 36 Top/Bottom Interval(mm): 40/ 80 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 556.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 558.06 Sect/Pc #: 2/PCE 1
ROCK = BIOTITE-QUARTZ-PLAG-QUARTZ GNEISS;
Groundmass - QUARTZ ( 50%)
PLAGIOCLASE ( 20%)
BIOTITE ( 20%)
GARNET ( 10%)
INCLUDES ALTERATION PRODUCTS, PLAG
ALL CLOUDY BUT STILL RECOGNIZABLE,GARNETS
MOSTLY REPLACED BY SIDERITE AND FINE-GRAINED
CHLORITE. BIOTITE (GREEN VARIETY) FORMS A
FABRIC PARALLEL TO LITHOLOGICAL BOUNDARY.
HOWEVER, WHILE INDIVIDUAL QUARTZ GRAINS ARE
ELONGATED PARALLEL TO THIS FABRIC, MANY ARE
PART OF OPTICALLY CONTINUOUS LARGE GRAINS
WHICH WERE ELONGATED AT APPROX. STRAIGHT ANGLES
TO PRESENT FABRIC. ROCK WAS ONCE MUCH COARSER
GRAINED. BETWEEN TWO ROCK TYPES IS ZONE OF
CLOUDED KSPAR-GARNET-BIOT-GNEISS CA. 2MM WIDE*
Leg : 36 Top/Bottom Interval(mm): 460/ 500 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 556.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 558.48 Sect/Pc #: 2/PCE 5
ROCK = PEGMATITE;
Groundmass - KFELDSPAR ( 50%)
QUARTZ ( 40%)
GARNET ( 4%)
PLAGIOCLASE ( 2%)
BIOTITE ( 4%)
INCLUDES CHLORITE;
ZIRCON ( TR%)
IN VEIN: NUMEROUS GRAINS OF SMALL GRANULAR TO
ELONGATED MINERAL: COLORLESS WITH RELIEF,
FIRST ORDER INTERFERENCE COLORS,STRAIGHT
EXTINCTION, LENGTH SLOW BIAX POSITIVE, SMALL
2V, OPTICS FIT TOPAZ. KSPAR IN REMAINDER OF
OF SECTION HAS A FEW CARLSBAD TWINS. IN SUCH
XTLS, UNTWINNED PART HAS LOW 2V,TWINNED PART
HAS HIGHER 2V ANGLE. THIS ROCK HAS SAME
COMP AS PINK-KSPAR PEGMATITE, BUT HAS
SUFFERED SOME REXTLLIZATION TO GIVE FINER
GRAIN; HAS LOST ITS PINK-ORANGE COLOR. HAS
SMALL GARNETS PARTLY REPLACED BY FINE-GRAINED
PALE GREEN ALMOST ISOTROPIC CHLORITE. GARNET
SIZE 1-2MM, BIOTITE HAS NO COLOR..NOR DO THEY
FOLLOW WELL-DEFINED FABRIC, SUGGESTS MAY BE
EARLIER PEGMATITE THAN LATER
COARSE-GRAINED TYPES. FABRIC MORE
OBVIOUS IN HAND SPECIMAN THAN IN THIN SECTION*
Leg : 36 Top/Bottom Interval(mm): 740/ 760 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 556.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 558.75 Sect/Pc #: 2/PCE 10
ROCK = BANDED GRANULITIC GNEISS;
Groundmass - QUARTZ ( 60%)
PLAGIOCLASE
CLOUDED;
BIOTITE
GREEN;
KFELDSPAR ( TR%)
NEAR PEGMATITIC BAND;
GARNET ( TR%)
REPLACED BY FINE-GRAINED CHLORITE, THE ABOVE
PRESENT IN VARIABLE PROPORTIONS IN THE BANDED
GNEISS. ALTERNATING QTZ-RICH AND QTZ-POOR BANDS.
LATTER RICH IN GREEN BIOT. LITTLE RED-BROWN BIOT
REMAINS. GARNETS (<1MM) OCCUR ONLY IN PELITIC
BANDS AND ARE MOSTLY REPLACED BY VERY FINE-GRAINED
PALE GREEN RANDOMLY ORIENTED CHLORITE.PLAG OCCURS
MAINLY IN QUARTZ-RICH BANDS; BUT SOME FINE-GRAINED
MATERIAL IN PELITIC AREAS MAY REPRESENT PLAG.
PEGMATITIC BAND IS MAINLY QTZ AND PARTLY CLOUDED
PLAG.ONLY TRACE OF KSPAR.OBVIOUS GRAIN REDUCTION
AT MARGIN OF PEGMATITE VEINS-XTLS OF QUARTZ
REDUCED TO ABOUT 1/5 OF SIZE BY DEFORMATION*
Leg : 36 Top/Bottom Interval(mm): 1040/1080 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 556.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 559.06 Sect/Pc #: 2/PCE 16
ROCK = SEMIPELITIC GNEISS;
Groundmass - QUARTZ ( 45%)
PLAGIOCLASE ( 35%)
ABOUT 10% REPLACED BY CALCITE AND SIDERITE;
BIOTITE ( 15%)
GARNET ( 5%)
BANDED INTO QUARTZ-RICH (QTZ 70,PLAG 30) AND
PLAG-BIOTITE-RICH (PLAG 70,QTZ TO BIOT 20)
PORTIONS. PLAG BADLY CLOUDED-HARDLY
RECOGNIZABLE AS SUCH, AS WELL AS BEING REPLACED
BY CALCITE AND SIDERITE, ALSO REPLACED BY
MATERIAL OPTICALLY LIKE CRYPTOCRYSTALLINE SILICA.
SMALL GARNET GRAINS SCATTERED OVER SLIDE OBVIOUSLY
PART OF LARGER AGGREGATES REPLACED BY FINE-GRAINED
CHLORITE-ALMOST ISOTROPIC BIOTITE IS MIXTURE OF
RED AND GREEN TYPES. QUARTZES ABOUT 1MM SIZE AND
FLATTENED PARALLEL TO FOLIATION -BUT MANY ADJACENT
AGGREGATES EXTINGUISH SIMULTANEOUSLY - MUST BE
PART OF LARGE GRAIN WHICH HAS BEEN REXTLLIZED*
Leg : 36 Top/Bottom Interval(mm): 1200/1240 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 556.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 559.22 Sect/Pc #: 2/PCE 18
ROCK = SEMIPELITIC GNEISS;
Groundmass - QUARTZ ( 50%)
KFELDSPAR ( 30%)
CLOUDED;
BIOTITE ( 12%)
GARNET ( 5%)
TOURMALINE ( 1%)
SIDERITE ( 1%)
ROCK HAS QUITE GOOD FOLIATION.EVEN QUARTZOSES
AND KSPAR ELONGATED PARALLEL TO FOLIATION,
BUT SOME OBVIOUS GRAIN REDUCTION. LARGE
GARNETS - SEVERAL MM, STRUNG OUT ALONG
FOLIATION. SLIGHT RELACEMENT BY FINE-GRAINED
CHLORITE- BUT MUCH LESS EXTENSIVE THAN
RED-BROWN SMALLER GARNETS. TOURMALINE
ALIGNED IN FOLIATION. HAS NUMEROUS LONG
NEEDLE-LIKE INCLUSIONS PARALLEL TO ITS
LENGTH. SIDERITE REPLACED BY MICAS. GREEN
BIOTITE DOMINANT OVER BROWN BIOTITE. TWO
KSPAR(?) -FILLED VEINS AND FOLIATION, ONE
RATHER CLOUDED.RATHER UNDULOSE APPEARANCE,
DEFINITELY BIAXIAL TO
MICROCLINE?*
Leg : 36 Top/Bottom Interval(mm): 1400/1430 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 556.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 559.42 Sect/Pc #: 2/PCE 21
ROCK = BANDED GARNET-BIOT-PLAG-QTZ-GNEISS
WITH KSPAR BAND;
Groundmass - QUARTZ
QTZ-RICH BANDS MAINLY 60% QTZ AND 40% PLAG;
MICA
MICA-RICH LAYERS: BIOTITE AND CLOUDY PLAG AND
SOME QUARTZ;
QUARTZ
IN PEGMATITE VEIN QTZ 40% AND KSPAR 40%;
OTHER
ALSO APATITE, CALCITE, CHALCEDONY?, SIDERITE ORE;
GARNET
GARNET LAYERS OCCUR BETWEEN QUARTZ-RICH AND QUARTZ
POOR BANDS. SIZE ABOUT 1MM. MOST BIOTITE IS GREEN
VARIETY, BUT SOME RED-BROWN PRESERVED IN MICA-
BANDS. MUCH SECONDARY SERICITE AND PYROPHYLLITE.
PLAG CENTERS REPLACED BY CALCITE OR SIDERITE,OR BY
FINE-GRAINED ALMOST ISOTROPIC MINERAL (LOW R.I.)
AND HARMATITE GRAINS*
Leg : 36 Top/Bottom Interval(mm): 1470/1480 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 556.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 559.48 Sect/Pc #: 2/PCE 22
ROCK = GRANULITIC GNEISS;
Groundmass - QUARTZ ( 60%)
PLAGIOCLASE ( 25%)
BIOTITE ( 10%)
GARNET ( 5%)
KFELDSPAR ( 0%)
ZIRCON ( TR%)
OPAQUE MINERALS ( TR%)
PLAG IN ACID GNEISS IS CLOUDED BROWN -
MUCH SERICITE AND INCIPIENT REPLACEMENT
BY CALCITE. COMPOSITION OF CORES APPROX
AN25 - VERY CALCIC FOR ACID GNEISS. BROWN
BIOTITE REPLACED 80% BY GREEN BIOTITE:
PROCESS CAUSES EXSOLUTION OF MAGNETITE AND
QUARTZ FROM BROWN BIOTITE .. PARTIAL
TRANSITION TOWARD CHLORITE? GARNET IN
AGGREGATES ABOUT 1MM IN SIZE, SIEVED WITH
QUARTZ. SOME SHOW PARTIAL REPLACEMENT BY
GREEN BIOTITE. TEXTURE IS GRANULAR;EVEN
BIOTITES HAVE TENDENCY TO FORM EQUANT,
THAN ELONGATED GRAINS. BIOTITES ARE
ALIGNED PARALLEL TO FOLIATION HOWEVER.
MORE AND LARGER GARNET AGGREGATES ALONG
CONTACT BETWEEN PEGMATITE AND GRANULAR
GNEISS. AGGREGATES STILL SIEVED WITH QUARTZ.
BIOTITES NOT SO HEAVILY REPLACED BY GREEN
BIOTITE. PLAG MORE SODIC,ABOUT AN20?*
Leg : 36 Top/Bottom Interval(mm): 1470/1480 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 556.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 559.48 Sect/Pc #: 2/PCE 22
ROCK = PEGMATITE VEIN;
Groundmass - QUARTZ ( 30%)
PLAGIOCLASE ( 15%)
BIOTITE ( 10%)
GARNET ( 20%)
KFELDSPAR ( 25%)
ZIRCON ( TR%)
OPAQUE MINERALS ( 2%)
AMOUNTS FROM ROUGH ESTIMATES*
Leg : 36 Top/Bottom Interval(mm): 0/ 60 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 566.00 Rock Type: IGNEOUS
Core: 17 Sample Midpoint(m) : 566.03 Sect/Pc #: 1/PCE 1
ROCK = GRANULITIC GNEISS
BINOCULAR SCOPE EXAMINATION;
Groundmass - QUARTZ ( 60%)
PLAGIOCLASE ( 25%)
BIOTITE ( 8%)
GARNET ( 3%)
PINK;
CHLORITE
Size(mm): 4
PALE GREEN;
PYRITE ( T%)
Size(mm): R
SMALL AMOUNT OF PEGMATITE WITH ORANGE
KSPAR, QUARTZ AND BIOTITE INTERMIXED WITH
PALE GREEN CHLORITE, GNEISS RATHER POOR IN
MICA, BUT BANDED INTO MICA-RICH AND MICA-
PORTIONS. GARNETS IN IRREGULARLY
DISTRIBUTED PATCHES AND MAY BE SECONDARY,
HYDROTHERMAL ORIGIN,UNRELATED TO FOLIATION
IN THE GNEISS.ROCK HAS APPEARANCE OF FAULT
BRECCIA; LITHOLOGICAL BANDS DISCONTINUOUS
AND BROKEN BY SMALL SHEARS AND VEINS*
Leg : 36 Top/Bottom Interval(mm): 580/ 630 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 566.00 Rock Type: IGNEOUS
Core: 17 Sample Midpoint(m) : 566.60 Sect/Pc #: 1/PCE 3
ROCK = SEMI-PELITIC GNEISS;
Groundmass - QUARTZ ( 55%)
KFELDSPAR ( 15%)
BIOTITE ( 15%)
BROWN-GREEN;
PLAGIOCLASE ( 8%)
GARNET ( 6%)
TOURMALINE ( 2%)
APATITE ( TR%)
ZIRCON ( TR%)
ABOUT 10% SERICITE VEINS, PLAG MORE CLOUDED THAN
KSPAR. QUARTZ,PLAG AND KSPAR EQUIGRANULAR,SOME
BIOTITE RATHER LARGER, BUT MOST SMALLER. SLIGHT
FLATTENING PARALLEL TO FOLIATION AND
MINERALOGICAL BANDING. TOURMALINE STRONGLY
ALIGNED IN FOLIATION IN 10:1 RATIO. GARNET
GRAINS SEVERAL MM IN SIZE. AGGREGATES IN SORT OF
VERMICULAR INTERGROWTH WITH QUARTZ AND SOME
ALIGNMENT ALONG FOLIATION. SOME SLIGHT
REPLACEMENT BY FINE-GRAINED GREEN CHLORITE/
BIOTITE. RED BIOTITE TO GREEN BIOTITE TO
PALE GREEN TO COLORLESS BIOTITE-CHLORITE*
Leg : 36 Top/Bottom Interval(mm): 0/ 0 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 566.00 Rock Type: IGNEOUS
Core: 17 Sample Midpoint(m) : 569.00 Sect/Pc #: 3/PCE 1
ROCK = GRANULITIC GNEISS
ENCODED FROM P.894, IR;
Groundmass - QUARTZ ( 60%)
PLAGIOCLASE ( 25%)
BIOTITE ( 8%)
GARNET ( 3%)
Leg : 36 Top/Bottom Interval(mm): 280/ 350 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 566.00 Rock Type: IGNEOUS
Core: 17 Sample Midpoint(m) : 569.32 Sect/Pc #: 3/PCE 5
ROCK = GNEISS;
Groundmass - GARNET ( 40%)
QUARTZ ( 55%)
BIOTITE ( 4%)
ZIRCON ( 1%)
SECONDARY SERICITE VEINS. CONTACT GNEISS,
GARNETS PERFECTLY FRESH, IN SORT OF
VERMICULAR INTERGROWTH WITH QUARTZ,
PROBABLY ALL PLAG IN VICINITY HAS BEEN
USED UP IN GROWTH OF GARNETS. SOME
BROWN BIOTITE REMAINS BUT MOST CHANGED TO
CHLORITE*
Leg : 36 Top/Bottom Interval(mm): 280/ 350 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 566.00 Rock Type: IGNEOUS
Core: 17 Sample Midpoint(m) : 569.32 Sect/Pc #: 3/PCE 5
ROCK = PEGMATITE MARGIN;
Groundmass - PLAGIOCLASE ( 40%)
QUARTZ ( 35%)
BIOTITE ( 9%)
ALTERED;
KFELDSPAR ( 15%)
ZIRCON ( 1%)
NOTE THAT MARGIN OF PEGMATITE IS MUCH
POORER IN KSPAR AND RICHER IN PLAG AND QTZ
THAN CONTACT, PLAG CENTERS FRESH, BUT
SERICITIZED TOWARD MARGINS, COMP VERY CLOSE TO
AN20, TWINNED ON ALBITE AND CARLSBAD, KSPAR
ALSO SLIGHT CLOUDING, NO TWINS,SURPRISINGLY
LOW 2V ABOUT 10 DEGREES TO 20 DEGREES,
SANIDINE?, NO PERTHITIC LAMELLAE, BIOTITES
PRETTY MUCH ALTERED TO FINE-GRAINED CHLORITE
WITH ANOMALOUS BLUE COLORS - STILL LENGTH SLOW.
SOME BROWN BIOTITE REMAINS*
Leg : 36 Top/Bottom Interval(mm): 0/ 0 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 566.00 Rock Type: IGNEOUS
Core: 17 Sample Midpoint(m) : 570.60 Sect/Pc #: CC/PCE 2
ROCK = GRANITE PEGMATITE;
Groundmass - QUARTZ ( 25%)
KFELDSPAR ( 60%)
PLAGIOCLASE ( 10%)
BIOTITE ( 5%)
BIOTITE TO CHLORITE;
ZIRCON ( 1%)
MUSCOVITE
CHLORITE
IN VEINS;
SCAPOLITE
KSPAR MICROPERTHITIC, CARLSBAD TWINS;
PARTIALLY AND VARIABLY CONVERTED TO
MICROCLINE, SPECTACULAR VERMICULAR
INTERGROWTHS WITH QUARTZ. SLIGHT
INCIPIENT REPLACEMENT BY FINE-GRAINED
MUSCOVITE, PLAG (OLIGOCLASE) TWINNED ON
ALBITE, CARLSBAD AND PERICLINE LAWS; CLOUDED
AND SERICITIZED. SOME INCIPIENT REPLACEMENT
BY KSPAR NEAR QTZ INCLUSIONS, QTZ
WITH RUTILE NEEDLES AND MUSCOVITE
NUCLEII. ORIGINAL BIOTITE HAS
ALMOST BEEN COMPLETELY REPLACED BY CHLORITE
(V.PALE GREEN : ANOMALOUS BLUE INTERFERENCE
COLORS) OR OTHER FINE-GRAINED RUBBISH, WITH
MUCH EXSOLVED MAGNETITE*
Leg : 36 Top/Bottom Interval(mm): 0/ 0 Describer: Tarney, J.
Hole: 330 Top of Core Depth(m) : 566.00 Rock Type: IGNEOUS
Core: 17 Sample Midpoint(m) : 570.60 Sect/Pc #: CC/PCE 2
ROCK = CHILLED MARGIN OF LATER INTRUSION;
Groundmass - PLAGIOCLASE ( 3-5%)
Morphology: LATHS
MUSCOVITE ( 5%)
KFELDSPAR ( 1%)
GROUNDMASS ( 90%)
VERY IRREGULAR BROKEN CONTACT, NO OBVIOUS
METAMORPHIC EFFECT, SHARP TRANSITION, PLAG
LATHS PARALLEL TO CONTACT, GROUNDMASS
CRYSTALLINITY SUB-MICROSCOPIC*
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