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* |
Cite as: Deep Sea Drilling Project (1989): Archive of Core and Site/Hole Data and Photographs from the Deep Sea Drilling Project (DSDP). National Geophysical Data Center, NOAA. doi:10.7289/V54M92G2 [access date]
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