Leg : 64 Top/Bottom Interval(mm): 10/ 40 Describer: Fornari, D.
Hole: 475 Top of Core Depth(m) : 158.00 Rock Type: METAMORPHIC
Core: 18 Sample Midpoint(m) : 158.03 Sect/Pc #: 1/PCE 1
ROCK = METABASALT
ENCODED FROM THE ICD;
Texture: PHYRIC
FINE-GRAINED GROUNDMASS,NO FOLIATION;
Phenocrysts- CLINOPYROXENE
ALTERED;
OLIVINE
ALTERED*
Alteration - CALCITE
Location: VEINS
Leg : 64 Top/Bottom Interval(mm): 70/ 100 Describer: Fornari, D.
Hole: 475 Top of Core Depth(m) : 158.00 Rock Type: METAMORPHIC
Core: 18 Sample Midpoint(m) : 158.09 Sect/Pc #: 1/PCE 2
ROCK = METAQUARTZITE
ENCODED FROM THE ICD;
Groundmass - QUARTZ ( 80%)
Size(mm): .00025
RAGGED EDGES,RECRYSTALLIZED UNDULATING EXTINCTION,
SET IN LACY MICA FRAMEWORK;
MICA
EPIDOTE
Alteration - MICA
EPIDOTE
Leg : 64 Top/Bottom Interval(mm): 180/ 200 Describer: Fornari, D.
Hole: 475 Top of Core Depth(m) : 158.00 Rock Type: SEDIMENTARY
Core: 18 Sample Midpoint(m) : 158.19 Sect/Pc #: 1/PCE 4
ROCK = QUARTZ SANDSTONE
ENCODED FROM THE ICD,LOW-GRADE,CEMENTED BY ALTERED
CLAY,GRAINS ROUNDED SUBHEDRAL OR ANGULAR-MANY
HIGHLY WEATHERED TO SERICITE;
Groundmass - SILICA
PYROXENE
SCATTERED,FELDSPAR-RICH*
Alteration - SERICITE
Leg : 64 Top/Bottom Interval(mm): 240/ 260 Describer: Saunders, A.
Hole: 475 Top of Core Depth(m) : 158.00 Rock Type: SEDIMENTARY
Core: 18 Sample Midpoint(m) : 158.25 Sect/Pc #: 1/PCE 5
ROCK = RECRYSTALLIZED TRACHYTE;
Texture: PORPHYRITIC,FINE-GRAINED,PILOTAXITIC;
Where sampled: OTHER
BLOCK IN CONGLOMERATE*
Phenocrysts- SPHENE ( 3%)
Size(mm): 0.1-0.5 Morphology: CUBIC-IRREGULAR
REDDISH,REPLACING TITAN.MT;
KFELDSPAR ( 10%)
Size(mm): 0.5-2 Morphology: SUBHEDRAL-EUHEDRAL
ORTHOCLASE OR SANIDINE,RATHER BADLY ALTERED*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 40%)
Size(mm): <0.4 Morphology: LATHS
QUARTZ ( 30%)
Size(mm): <0.2
INTERSTITIAL,INTERGROWN WITH FELDSPAR
CHLORITE ( 15%)
Size(mm): 0.05-0.5 Morphology: ELONGATE STRANDS
PLEOCHROIC GREEN,ANOMALOUS INTERFERENCE COLORS,
IDENTITY UNCERTAIN FOR CHLORITE*
Alteration - PREHNITE ( 5%)
Replacing: AMPHIBOLE
RANDOM PSEUDOMORPHS,REPLACING AMPHIBOLE IS
QUESTIONABLE*
Leg : 64 Top/Bottom Interval(mm): 430/ 500 Describer: Fornari, D.
Hole: 475 Top of Core Depth(m) : 158.00 Rock Type: METAMORPHIC
Core: 18 Sample Midpoint(m) : 158.47 Sect/Pc #: 1/PCE 8
ROCK = METAMORPHOSED CONGLOMERATE
ENCODED FROM THE ICD,MOSTLY ROCK FRAGMENTS,
METAMORPHIC,LOW-GRADE,CLASTS INCLUDE LAMINATED
QUARTZ SILISTONE+COARSE WEATHERED GRANITE+
QUARTZ-MICA SCHIST,MOST FRACTURED+BROKEN,TRACE
OF BLACK BITUMEN IMPREGNATION,CLAY MINERAL AND
QUARTZ CEMENT;
Alteration - CLAY MINERALS
Leg : 64 Top/Bottom Interval(mm): 650/ 740 Describer: Fornari, D.
Hole: 475 Top of Core Depth(m) : 158.00 Rock Type: METAMORPHIC
Core: 18 Sample Midpoint(m) : 158.70 Sect/Pc #: 1/PCE 11
ROCK = METAMORPHOSED CONGLOMERATE
ENCODED FROM THE ICD,MOSTLY ROCK FRAGMENTS,
METAMORPHIC,LOW-GRADE,CLASTS INCLUDE LAMINATED
QUARTZ SILISTONE+COARSE WEATHERED GRANITE+
QUARTZ-MICA SCHIST,MOST FRACTURED+BROKEN,TRACE
OF BLACK BITUMEN IMPREGNATION,CLAY MINERAL AND
QUARTZ CEMENT;
Alteration - CLAY MINERALS
Leg : 64 Top/Bottom Interval(mm): 60/ 90 Describer: Saunders, A.
Hole: 475 Top of Core Depth(m) : 167.50 Rock Type: SEDIMENTARY
Core: 19 Sample Midpoint(m) : 167.58 Sect/Pc #: 1/PCE 2
ROCK = QUARTZ-FELDSPAR PORPHYRY
ROCK MAY HAVE BEEN A TUFF ALTHOUGH NO LINEATION
CAN BE SEEN;
Texture: PORPHYRITIC,RECRYSTALLIZED GROUNDMASS;
OTHER
PEBBLE IN CONGLOMERATE*
Phenocrysts- QUARTZ ( 10%)
Size(mm): 0.4-2.5 Morphology: SUBHEDRAL-EUHEDRAL
SLIGHTLY ROUNDED;
FELDSPAR ( 15%)
Size(mm): 0.5-3 Morphology: SUBHEDRAL
ORTHOCLASE? + ALBITE,XTLS OFTEN IN GLOMEROCRYSTIC
AGGREGATES*
Groundmass - QUARTZ
GROUNDMASS COMPRISES RECRYSTALLIZED QUARTZ + FEL;
FELDSPAR
GROUNDMASS COMPRISES RECRYSTALLIZED QUARTZ + FEL;
CHLORITE ( 5%)
Size(mm): <0.1 Morphology: FIBROUS
IDENTITY QUESTIONABLE*
Alteration - EPIDOTE ( 5%)
Replacing: FEL
IDENTITY AND PERCENTAGE ARE QUESTIONABLE*
Leg : 64 Top/Bottom Interval(mm): 120/ 150 Describer: Saunders, A.
Hole: 475 Top of Core Depth(m) : 167.50 Rock Type: TUFF
Core: 19 Sample Midpoint(m) : 167.64 Sect/Pc #: 1/PCE 3
ROCK = RHYOLITIC IGNIMBRITE
OR RECRYSTALLIZED FLOW BANDED RHYOLITE;
Texture: PORPHYRITIC,IGNIMBRITIC,RECRYSTALLIZED;
Where sampled: OTHER
COBBLE IN CONGLOMERATE*
Phenocrysts- FELDSPAR ( 10%)
Size(mm): 1-2 Morphology: SUBHEDRAL
ALBITE OR ORTHOCLASE,SERICITIZED,LYING IN FINE
GRAINED GROUNDMASS WHICH SHOWS DEFLECTION AROUND
PHENOS*
Groundmass - QUARTZ
FELDSPAR
OPAQUE MINERALS
COMBINATION
STRONGLY BANDED FINE GRAINED GROUNDMASS COMPRISING
QUARTZ + FEL + OP.MINS,BANDING ESPECIALLY WELL
ILLUSTRATED BY OP.MINS,FLOW OF GROUNDMASS DIVERTED
AROUND PHENOS*
Leg : 64 Top/Bottom Interval(mm): 320/ 350 Describer: Saunders, A.
Hole: 475 Top of Core Depth(m) : 167.50 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 167.84 Sect/Pc #: 1/PCE 7
ROCK = RECRYSTALLIZED RHYOLITIC GLASS;
Texture: MODERATELY PORPHYRITIC
GROUNDMASS IS PRACTICALLY AMORPHOUS*
Phenocrysts- ORTHOCLASE ( <3%)
Size(mm): <2 Morphology: SUBHEDRAL
Groundmass - QUARTZ ( 80%)
GROUNDMASS IS VERY FINE-GRAINED (PROBABLY QUENCHED
OR RECRYSTALLIZE),QUARTZ ORE RICH (PROBABLY 80%)*
Alteration - ( 10%)
Location: IN AGGREGATES
FIBROUS ACICULAR CLUSTERS,NOT KNOWN WHAT IS BEING
REPLACED*
Leg : 64 Top/Bottom Interval(mm): 430/ 470 Describer: Fornari, D.
Hole: 475 Top of Core Depth(m) : 167.50 Rock Type: TUFF
Core: 19 Sample Midpoint(m) : 167.95 Sect/Pc #: 1/PCE 9
ROCK = RHYOLITE TUFF
ENCODED FROM THE ICD,FINE-GRAINED RECRYSTALLIZED
GROUNDMASS,CHLORITE ALTERATION,QUARTZ ALTERATION,
WEATHERED RIND WITH IRON OXIDES,MANY GRAINS SHOW
SERICITIZATION,SOME FAINT GRAIN IMBRICATION;
Phenocrysts- ALBITE
Size(mm): 1-2 Morphology: SUBHEDRAL
ORTHOCLASE
Size(mm): 1-2 Morphology: SUBHEDRAL
PLAGIOCLASE
Size(mm): 1-2
Leg : 64 Top/Bottom Interval(mm): 100/ 170 Describer: Fornari, D.
Hole: 475 Top of Core Depth(m) : 177.00 Rock Type: SEDIMENTARY
Core: 20 Sample Midpoint(m) : 177.14 Sect/Pc #: 1/
ROCK = POLYGENETIC CONGLOMERATE
ENCODED FROM THE ICD,CLASTS ARE ANGULAR ROCK
FRAGMENTS TO BRECCIA (1-10MM),INCLUDE MICA-SCHIST+
QUARTZITE+GRANITE+LARGE QUARTZ-MICA FRAGMENTS,
GRAIN SUPPORTED,MATRIX SILICEOUS(CLAY+QUARTZ),SOME
MICA ENVELOPES,OP.MINS 5%*
Leg : 64 Top/Bottom Interval(mm): 450/ 520 Describer: Saunders, A.
Hole: 475 Top of Core Depth(m) : 177.00 Rock Type: TUFF
Core: 20 Sample Midpoint(m) : 177.49 Sect/Pc #: 1/PCE 8
ROCK = RHYOLITIC IGNIMBRITE;
Texture: PORPHYRITIC,FLOWBANDED WITH FIAMME
FIAMME ARE QUESTIONABLE;
Where sampled: OTHER
COBBLE IN CONGLOMERATE*
Phenocrysts- FELDSPAR ( 10%)
Size(mm): 1 Morphology: SUBHEDRAL
ORTHOCLASE OR ALBITE,SERICITIZED;
QUARTZ ( 5%)
Size(mm): 1 Morphology: SUBHEDRAL,EMBAYED
Groundmass - MATRIX
VERY FINE-GRAINED MATRIX OF QUARTZ + FEL + MINOR
MICAS + OP.MINS,STRONGLY FLOW-BANDED,
RECRYSTALLIZED GLASS STREAKS WERE PROBABLY FIAMME;
QUARTZ
FELDSPAR
MICA
OPAQUE MINERALS
Alteration - EPIDOTE ( 5%)
Location: RANDOM
Leg : 64 Top/Bottom Interval(mm): 550/ 600 Describer: Fornari, D.
Hole: 475 Top of Core Depth(m) : 177.00 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 177.58 Sect/Pc #: 1/PCE 9
ROCK = VOLCANIC ROCK
ROCK NAME IS TRACHYTE?,ENCODED FROM THE ICD;
Texture: PORPHYRITIC;
Phenocrysts- KFELDSPAR ( 30%)
PLAGIOCLASE-K-FELDSPAR,PHENOS AND FRAGMENTS;
PYROXENE ( 5%)
Morphology: EUHEDRAL-SUBHEDRAL
ALTERED;
SPHENE ( 3%)
QUARTZ ( 10%)
Size(mm): 1
Groundmass - DEVITRIFIED GLASS ( 40%)
LIGHT BROWN,PARTLY DEVITRIFIED,MUCH ISOTROPIC*
Leg : 64 Top/Bottom Interval(mm): 700/ 730 Describer: Fornari, D.
Hole: 475 Top of Core Depth(m) : 177.00 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 177.72 Sect/Pc #: 1/
ROCK = GLASSY VOLCANIC EFFUSIVE
50% EUHEDRAL TO FRAGMENTARY TO SUBHEDRAL TO
GLOBUAR FELDSPAR (PLAG AND K-FELDSPAR) AND QUARTZ
WITH 50% LIGHT BROWN ISOTOPIC GROUNDMASS,SOME
DEVITRIFICATION TO CHLORITE(?),ENCODED FROM THE
ICD*
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