Leg : 64 Top/Bottom Interval(mm): 01/ 0 Describer: Saunders, A.
Hole: 474 Top of Core Depth(m) : 125.50 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 125.70 Sect/Pc #: CC/PCE 1
ROCK = FELDSPAR-HBL PHYRIC DIORITE;
Texture: INEQUIGRANULAR,MEDIUM-GRAINED,HYPIDIOMORPHIC-
GRANULAR*
Phenocrysts- FELDSPAR ( 15%)
Size(mm): TO 2 Morphology: TABULAR
MULTIPLE TWINNED,SLIGHTLY SERICITIZED TABULAR XTLS
OF PLAG,STRONGLY REGULARLY ZONED,FREQUENTLY
FRACTURED;
HORNBLENDE ( 5%)
Size(mm): TO 2 Morphology: TABULAR-IRREGULAR
SERIATE TEXTURE,OCCASIONALLY DEFORMED*
Groundmass - FELDSPAR ( 70%)
Size(mm): .1-.2
SHOW STRONG ZONING,ESPECIALLY AT RIMS,WITH
DEVELOPMENT OF SODIC? OVERGROWTHS,OFTEN GRAINS
COALESCE,INTERSTITIAL K-FELDSPAR MAY COMPOSE UP TO
15% OF THE GROUNDMASS;
QUARTZ ( 10%)
HORNBLENDE ( 15%)
BIOTITE ( 4%)
SLIGHT DEFORMATION(LATE XTLLIZATION?)RECORDED BY
DEFORMED BIOTITE XTLS;
OPAQUE MINERALS ( 1%)
Leg : 64 Top/Bottom Interval(mm): 02/ 0 Describer: Saunders, A.
Hole: 474 Top of Core Depth(m) : 125.50 Rock Type: TUFF
Core: 15 Sample Midpoint(m) : 125.70 Sect/Pc #: CC/PCE 2
ROCK = FELDSPAR-QUARTZ PHYRIC TUFF
ACID TUFF;
Texture: VERY FINE-GRAINED,PHYRIC*
Phenocrysts- FELDSPAR ( 20%)
Size(mm): TO 3 Morphology: TABULAR-IRREGULAR
DOMINANTLY UNTWINNED,K-FELDSPAR? BUT ALSO ALBITE,
SOME GRAINS SLIGHTLY ROUNDED,FRACTURED,SERICITIZED
PHENOS,ESPECIALLY FELDSPAR,SHOW SLIGHT ALIGNMENT
WITHIN MATRIX;
QUARTZ ( 10%)
Size(mm): TO . Morphology: 2
ROUNDED,OCCASIONALLY EMBAYED*
Groundmass - FELDSPAR
DOMINANTLY VERY FINE-GRAINED,CRYPTICALLY BANDED
QUARTZO-FELDSPATHIC MATRIX,GROUNDMASS QUARTZ AND
FELDSPAR CLOSELY INTERGROWN SUGGESTING POSSIBLE
PRIMARY IGNEOUS ORIGIN,SERICITIZATION OF PLAG;
QUARTZ
OPAQUE MINERALS
AMORPHOUS AND DENDRITIC GROWTHS OF OPAQUES
ESPECIALLY AROUND SOME PHENOS*
Alteration - CLINOZOISITE
Location: VEINS
VERY NARROW VEINS,POSSIBLY THE ORES(OPAQUES)
DESCRIBED*
Leg : 64 Top/Bottom Interval(mm): 03/ 0 Describer: Kelts, K.
Hole: 474 Top of Core Depth(m) : 125.50 Rock Type: METAMORPHIC
Core: 15 Sample Midpoint(m) : 125.70 Sect/Pc #: CC/PCE 3
ROCK = METAVOLCANIC
WEATHERED,ORIGIN LIKELY A MODERATELY BASIC TUFF
OR VOLCANICLASTIC,LOW GRADE? METAVOLCANIC IN
PROCESS OF WEATHERING;
Phenocrysts- HORNBLENDE ( 3%)
LIGHT GREEN HBL PHENOS WITH BENT CLEAVAGE TRACES
AND SOME WITH SMALL INCLUSIONS OF CALCITE+CLAYS*
Groundmass - MATRIX ( 40%)
APPEARS TO BE REXTLLIZED FINE FELDSPAR+QUARTZ
WHICH HAS BEEN STRAINED-UNDULATORY EXTINCTION;
CLAY MINERALS ( 40%)
FELDSPARS+MICAS+PYX+HBL PARTIALLY REPLACED BY
CLINOZOISITE(?),CLAY,EPIDOTE;
PLAGIOCLASE ( 10%)
QUARTZ ( 1%)
Morphology: ROUND
SOME LARGE ROUND QUARTZ FROM ASH FLOW?;
BIOTITE ( 1%)
ALTERING;
PLAGIOCLASE ( 5%)
Size(mm): .1-1 Morphology: LATHS
SOME RELICT LARGE PLAG LATHS*
|
