Leg : 64 Top/Bottom Interval(mm): 0/ 0 Describer: Fornari, D.
Hole: 476 Top of Core Depth(m) : 199.00 Rock Type: METAMORPHIC
Core: 22 Sample Midpoint(m) : 199.11 Sect/Pc #: CC/
ROCK = QUARTZITE
ENCODED FROM THE ICD;
Texture: GRANOBLASTIC,MICACEOUS,CATACLASTIC,
ROCK = RYSTALLIZED
SOME ZONES WITH FABRIC*
Groundmass - QUARTZ ( 50%)
Size(mm): 1-2 Morphology: IRREGULAR,ANGULAR
BROKEN GRAINS,STRESSED,MOSAIC FRAGMENTS,FRACTURED*
MUSCOVITE ( 20%)
CEMENT AND GRAIN ENVELOPES;
PLAGIOCLASE ( 2%)
RELICT;
FELDSPAR ( 5%)
ALTERED;
OTHER ( 2%)
ROCK FRAGMENTS (QUARTZ SCHIST)*
Leg : 64 Top/Bottom Interval(mm): 0/ 0 Describer: Fornari, D.
Hole: 476 Top of Core Depth(m) : 208.50 Rock Type: METAMORPHIC
Core: 23 Sample Midpoint(m) : 208.60 Sect/Pc #: CC/
ROCK = QUARTZITE
ENCODED FROM THE ICD,METASANDSTONE;
Texture: GRANOBLASTIC,COARSE,MICACEOUS
SCATTERED RELICT GRAIN BOUNDARIES,FELDSPARS,
CATACLASTIC ZONES*
Groundmass - QUARTZ ( 35%)
Size(mm): .25-.50 Morphology: GRAINS,ANGULAR
BROKEN,STRESSED;
MUSCOVITE ( 35%)
Size(mm): .025
STRESSED,DEFORMED;
MATRIX ( 30%)
QUARTZ-MICA MESHWORK (0.025MM) MATRIX*
Leg : 64 Top/Bottom Interval(mm): 0/ 0 Describer: Fornari, D.
Hole: 476 Top of Core Depth(m) : 218.00 Rock Type: METAMORPHIC
Core: 24 Sample Midpoint(m) : 218.13 Sect/Pc #: CC/
ROCK = METASANDSTONE
ENCODED FROM THE ICD,SIMILAR TO CORE 23-CC;
Texture: FELSIGRANOBLASTIC*
Groundmass - OTHER ( 10%)
Size(mm): .025
RELICT GRAIN OUTLINES REPLACED BY A FINE QUARTZ
MOSAIC;
MICA ( 20%)
Morphology: SHEAVES
BENT,DEFORMED (CHLORITE?),BROWNISH IN TS;
QUARTZ ( 10%)
Morphology: GRAINS
RECRYSTALLIZED;
MATRIX ( 35%)
FINE QUARTZ MOSAIC GROUNDMASS WITH MICA;
OPAQUE MINERALS ( 15%)
Morphology: SUBHEDRAL
Leg : 64 Top/Bottom Interval(mm): 200/ 230 Describer: Fornari, D.
Hole: 476 Top of Core Depth(m) : 227.50 Rock Type: IGNEOUS
Core: 25 Sample Midpoint(m) : 227.72 Sect/Pc #: 1/PCE 3
ROCK = GRANITIC ROCK
ENCODED FROM THE ICD;
Groundmass - QUARTZ ( 50%)
Size(mm): 2-4 Morphology: SUBANGULAR
STRESSED,FRACTURED,VEINS;
FELDSPAR ( 20%)
Size(mm): 0.02
PERTHITIC,WEATHERED TO FINE QUARTZ AND MICA AND
CLAYS;
PLAGIOCLASE ( 2%)
MATRIX ( 20%)
UNDIFFERENTIATED GROUNDMASS,FINE-GRAINED MICA-
QUARTZ-MACROSCOPICALLY ROCK*
Alteration - CARBONATE ( 3%)
Location: VEIN FILLING
AMPHIBOLE ( 2%)
Leg : 64 Top/Bottom Interval(mm): 380/ 480 Describer: Fornari, D.
Hole: 476 Top of Core Depth(m) : 227.50 Rock Type: METAMORPHIC
Core: 25 Sample Midpoint(m) : 227.93 Sect/Pc #: 1/PCE 5
ROCK = METABASALT
ENCODED FROM THE ICD,ROCK TYPE MAY BE DIABASE,
BRECCIATED ZONES CRISS-CROSSED BY CARBONATE-FILLED
IRREGULAR VEINS COMMONLY LINED BY A QUARTZ
MOSAIC;
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 0.05-0.1
MOSTLY FINE GROUNDMASS EQUIGRANULAR MESHWORK OF
RELICT AND REPLACED PLAG+MICA+EPIDOTE NEEDLES;
MICA ( 25%)
CHLORITE?;
EPIDOTE
Morphology: NEEDLES
HIGH BIREFRINGENCE;
QUARTZ ( 10%)
Size(mm): .15 Morphology: GRAINS
OPAQUE MINERALS ( 15%)
PYRITE
SCATTERED*
Alteration - EPIDOTE
CHLORITE
IDENTITY UNCERTAIN FOR CHLORITE*
Leg : 64 Top/Bottom Interval(mm): 10/ 60 Describer: Fornari, D.
Hole: 476 Top of Core Depth(m) : 237.00 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 237.04 Sect/Pc #: 1/PCE 1
ROCK = GRANITIC ROCK
WEATHERED,ENCODED FROM THE ICD,MANY MINERALS
ALTERED TO FINE (0.01-0.02 MM) GROUNDMASS,
EXTENSIVE SERICITIZATION OF FELDSPAR AND MAFICS;
Texture: GRANOBLASTIC;
Groundmass - QUARTZ ( 40%)
Size(mm): 1 Morphology: IRREGULAR,EQUIGRANULAR
CLEAR,SOME SUBHEDRAL FACES INTERLOCKING MOSAICS,
SOME STRESSED;
QUARTZ ( 20%)
IN FINE GROUNDMASS MESHWORK;
PLAGIOCLASE ( 10%)
Size(mm): 1-2
ALBITE TWINNED,PARTIAL RELICT,SERICITIZED;
KFELDSPAR ( 15%)
LARGE,TWINNED,PERTHITIC,LARGELY ALTERED;
OPAQUE MINERALS ( 5%)
AS ALTERATION OF MAFICS;
HORNBLENDE ( 5%)
RELICTS OF HBL,COMPLETELY ALTERED;
MUSCOVITE ( 15%)
Size(mm): 0.5-1 Morphology: SHEAVES
CLEAR,ALSO AS ALTERATION PRODUCTS IN GROUNDMASS*
Alteration - OPAQUE MINERALS
Replacing: MAFICS
MUSCOVITE
Leg : 64 Top/Bottom Interval(mm): 550/ 600 Describer: Saunders, A.
Hole: 476 Top of Core Depth(m) : 265.50 Rock Type: UNIDENTIFIED
Core: 29 Sample Midpoint(m) : 266.08 Sect/Pc #: 1/PCE 9
ROCK = CATACLASTIC GRANITE
PROPORTIONS GIVEN BELOW REFER TO HYPIDIOMORPHIC
GRANITE,INTERSPERSED BETWEEN BLOCKS OF FRESHER
HYPIDIOMORPHIC GRANITE (5-30 MM) ARE ZONES
COMPRISING SMALL (0.02-1.0 MM) ANGULAR FRAGMENTS
OF QUARTZ AND FELDSPAR IN A VERY FINE-GRAINED
OPAQUE-RICH MATRIX;
Texture: APHYRIC,CATACLASTIC;
Where sampled: OTHER
COBBLES*
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): TO 2 Morphology: ANHEDRAL-SUBHEDRAL
APPROX COMP ALBITE,SERICITIZED;
QUARTZ ( 40%)
Size(mm): 1-3 Morphology: ANHEDRAL,ROUNDED,FRACTURED
ALKALI FELDSPAR ( 40%)
Size(mm): 1-3 Morphology: SUBHEDRAL
APPROX COMP ORTHOCLASE,CONTAINING PERTHITE RODS;
ZIRCON ( TR%)
Size(mm): <0.2 Morphology: SUBHEDRAL
LYING INSIDE CHLORITE,PSEUDOMORPHS AFTER BIOTITE*
Alteration - SERICITE ( <1%)
Location: ALBITE Replacing: ALBITE
CHLORITE ( 5%)
Location: PSEUDOMORPHS Replacing: BIOTITE,HBL
Leg : 64 Top/Bottom Interval(mm): 710/ 770 Describer: Saunders, A.
Hole: 476 Top of Core Depth(m) : 265.50 Rock Type: UNIDENTIFIED
Core: 29 Sample Midpoint(m) : 266.24 Sect/Pc #: 1/PCE 11
ROCK = CATACLASTIC GRANITE
PROPORTIONS GIVEN BELOW APPLY TO HYPIDIOMORPHIC
GRANITE,INTERSPERSED BETWEEN BLOCKS OF FRESHER
HYPIDIOMORPHIC GRANITE (5-30 MM) ARE ZONES
COMPRISING SMALL (0.02-1.0 MM) ANGULAR FRAGMENTS
OF QUARTZ AND FELDSPAR IN A FINE-GRAINED OPAQUE-
RICH MATRIX;
Texture: APHYRIC,CATACLASTIC;
Where sampled: OTHER
COBBLE*
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): TO 2 Morphology: SUBHEDRAL
APPROX COMP ALBITE,SERICITIZED;
QUARTZ ( 40%)
Size(mm): TO 3 Morphology: ANHEDRAL,ROUNDED,FRACTURED
ALKALI FELDSPAR ( 40%)
Size(mm): 1-3 Morphology: SUBHEDRAL
ORTHOCLASE + PERTHITIC RODS;
ZIRCON ( TR%)
Size(mm): <0.2 Morphology: SUBHEDRAL
LYING INSIDE CHLORITE,AFTER BIOTITE PSEUDOMORPHS*
Alteration - SERICITE ( <1%)
Location: ALBITE Replacing: ALBITE
CHLORITE ( 5%)
Location: PSEUDOMORPHS Replacing: BIOTITE,HBL
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