Leg : 17 Top/Bottom Interval(mm): / Describer: Bass, M. Hole: 170 Top of Core Depth(m) : 138.00 Rock Type: IGNEOUS Core: 10 Sample Midpoint(m) : 138.10 Sect/Pc #: CC/ ROCK = PLAG PHYRIC MUGEARITE SOURCE IS IR,SEE P.492,FAIRLY FRESH; Texture: CHILLED,PHYRIC* Phenocrysts- PLAGIOCLASE ( 12.1%) Size(mm): 0.72X0.14 PLAGIOCLASE ( 10.6%) Size(mm): 0.13X0.01 SMALL EXTINCTION ANGLES INDICATE NA-RICH COMP* Groundmass - OPAQUE MINERALS ( 2.6%) Morphology: EQUANT,EUHEDRAL CUBES ISOLATED LOCALLY CLUSTERED BUT NOT GLOMERATIC, MAY OCCUR AS INCLUSIONS IN PLAG PHENOS; ILMENITE ( 17.8%) Morphology: DENDRITIC GROUNDMASS ( 56.8%) INCLUDES MICA+AMPHIBOLE+MONT+APATITE,MODAL ANALYSIS* Alteration - MICA Location: GROUNDMASS AMPHIBOLE Location: GROUNDMASS MONTMORILLONITE Location: GROUNDMASS, Location: VESICLES APATITE Location: GROUNDMASS Vesicles - Filling: MONT I Shape: RREGULAR, Filling: O Shape: VOID TINY,SOME EMPTY,LARGER VESICLES TO 1+MM COMMON- THESE ARE LINED BY TERMINATED PLAG XTLS LINED BY GREEN MONT,VESICLES ON INTERIOR USAUALLY LARGER AND LESS COMMONLY FILLED THAN THOSE IN DARK ALTERED RIMS* Leg : 17 Top/Bottom Interval(mm): 170/ 290 Describer: Bass, M. Hole: 170 Top of Core Depth(m) : 192.00 Rock Type: IGNEOUS Core: 16 Sample Midpoint(m) : 192.23 Sect/Pc #: 1/ ROCK = PYX-OL-PLAG MOD MICROPHYRIC BASALT SOURCE IS IR,SEE PP. 492-493; Texture: COARSE-GRAINED,DIABASIC INTERSERTAL, NONVARIOLITIC* Phenocrysts- PYROXENE ( 1.2%) Size(mm): 0.2X0.15 MAY BE PARTLY TO ALMOST COMPLETELY REPLACED OR RIMMED BY CALCITE; OLIVINE ( 0.6%) Size(mm): 0.2X0.2 Morphology: PSEUDOMORPHS CELAD AND/OR MONT?,MAY HAVE CALCITE FRINGES; PLAGIOCLASE ( 0.4%) Size(mm): 0.3X0.04 FRESH EXCEPT FOR RARE PATCHES OF CALCITE* Groundmass - PLAGIOCLASE ( 18.0%) Size(mm): 0.04X0.013 OPAQUE MINERALS ( 16.6%) Size(mm): 0.04X0.02 Morphology: GRAINS,EQUANT,ELONGATE OPAQUE AND BROWN TRANSLUCENT GRAINS,DIMENSIONS OF ELONGATE GRAINS ARE 0.1X0.03,MODAL ANALYSIS* Alteration - COMBINATION ( 53.1%) INCLUDES CELAD+AMPH,BROWN AMPHIBOLE,CELAD REPLACES THE INTERSTITIAL RESIDUUM AND PYX(?); OTHER ( 9.8%) Location: <0.002 INTERSTITIAL MASS,INCLUDES EXTREMELY FINE-GRAINED CELAD+FELDSPAR(PLAG)+KSPAR(POSSIBLY)+OP.MINS + MONT(POSSIBLY A TRACE),ALSO INCLUDES LARGE AMOUNTS OF A HIGH RELIEF MINERAL WHICH MAY BE SPHENE OR ANATASE OR EPIDOTE; CALCITE ( 0.2%) Replacing: MICROPHENOS Vesicles - Percent: 0 Leg : 17 Top/Bottom Interval(mm): 320/ 370 Describer: Bass, M. Hole: 170 Top of Core Depth(m) : 192.00 Rock Type: IGNEOUS Core: 16 Sample Midpoint(m) : 192.35 Sect/Pc #: 1/ ROCK = PYX SPARSELY MICROPHYRIC BASALT SOURCE IS IR,SEE P.494,HIGHLY ALTERED; Texture: COARSE-GRAINED,DIABASIC INTERSERTAL,ORIGINALLY MAY HAVE BEEN INTERGRANULAR TO SUBOPHITIC BEFORE THE Texture: PYX WAS ALTERED TO MONT* Phenocrysts- PYROXENE ( 0.3%) OLIVINE ( 0%) Groundmass - PYROXENE ( 5.2%) Size(mm): 0.1X0.1 PLAGIOCLASE ( 34.7%) Size(mm): 0.25X0.40 INCLUDES TRACE OF KSPAR; OPAQUE MINERALS ( 48.7%) Morphology: EQUANT,ELONGATE MODAL ANALYSIS* Alteration - MONTMORILLONITE ( 48.7%) APATITE ( TR%) MICA ( TR%) ONE FLAKE OF WHITE MICA,ONLY ONE IDENTIFIED OPTICALLY,MAY BE CELAD OR BLEACHED BIOTITE; CALCITE ( 3.3%) Replacing: PYX IRREGULAR AND EUHEDRAL PATCHES,MAINLY INTERSERTAL BUT SOME REPLACE PYX; KFELDSPAR ( TR%) Location: CORES Replacing: PLAG RARELY REPLACE CORES* Leg : 17 Top/Bottom Interval(mm): 610/ 700 Describer: Bass, M. Hole: 170 Top of Core Depth(m) : 192.00 Rock Type: IGNEOUS Core: 16 Sample Midpoint(m) : 194.16 Sect/Pc #: 2/ ROCK = APHYRIC BASALT SOURCE IS IR,SEE P.495,ALTERED; Texture: COARSE-GRAINED,APHYRIC,DIABASIC INTERSERTAL, MAY ORIGINALLY HAVE BEEN DIABASIC INTERGRANULAR* Groundmass - OLIVINE ( 0%) PLAGIOCLASE ( 46.3%) ALSO INCLUDES SECONDARY MONT+KSPAR; PYROXENE ( 3.0%) OPAQUE MINERALS ( 5.4%) INCLUDES SPINEL+ILMENITE+ACCESSORY YELLOW SULFIDE (PROBABLY PYRITE),MODAL ANALYSIS* Alteration - MONTMORILLONITE ( 41.7%) COMBINATION ( 2.7%) INCLUDES BIOTITE+CHLORITE+CELAD(?); AMPHIBOLE ( 0.8%) CALCITE ( 0.1%) APATITE ( TR%) KFELDSPAR Leg : 17 Top/Bottom Interval(mm): 1440/1470 Describer: Bass, M. Hole: 170 Top of Core Depth(m) : 192.00 Rock Type: IGNEOUS Core: 16 Sample Midpoint(m) : 194.96 Sect/Pc #: 2/ ROCK = APHYRIC BASALT SOURCE IS IR,SEE PP.495-496,LESS ALTERED THAN 16-2,61-70CM; Texture: COARSE-GRAINED,APHYRIC,DIABASIC,VARIES LOCALLY FROM INTERGRANULAR TO INTERSERTAL,LOCAL INTERGRANULARITY MORE APPARENT THAN IN 16-2,61-70 AND HIGHER SPECIMENS BECAUSE OF BETTER PYX Piece #: ERVATION* Groundmass - PLAGIOCLASE ( 53.2%) Size(mm): 1.3X0.22 INCLUDES SECONDARY MONT; COMBINATION ( 20.3%) INCLUDES PYX+MONT,UNEQUIVOCALLY DERIVED FROM PYX; OPAQUE MINERALS ( 5.3%) Morphology: EQUANT,ELONGATE EQUANT = 0.05/0.3,ELONGATE=0.3X0.02/3.35X0.03, MODAL ANALYSIS* Alteration - MONTMORILLONITE ( 19.3%) MAY INCLUDE PSEUDOMORPHS AFTER OL,WITHIN MONT ARE DISCRETE BOOKS OR LARGE FLAKES WHICH ARE DIRTY WITH INCLUSIONS,MAY BE RELICS OF SINGLE XTL IDDINGS WHICH HAD REPLACED PRIMARY OL OR MUCH LESS LIKELY ALTERED BIOTITE,RARE INTERSERTAL PATCHES HAVE SUBHEDRAL OUTLINES AND MAY ENCLOSE BIOTITE FLAKES OR TINY CALCITE PATCHES-THESE ARE THE ONLY DIRECT SUGGESTIONS OF PSEUDOMORPHS AFTER OL-BUT THEY MAY EQUALLY WELL BE ALTERED BIOTITE; COMBINATION ( 0.8%) INCLUDES BROWN BIOTITE+CHLORITE+CELAD(?),BIOTITE IN SOME CASES CONCENTRATED AROUND EQUANT OPAQUE GRAINS WHICH PROBABLY ARE TITANOMAGNETITE; AMPHIBOLE ( 0.5%) CALCITE ( TR%) APATITE ( 0.6%) Vesicles - Percent: 0 |
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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