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 |
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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