Leg : 17 Top/Bottom Interval(mm): 1370/1400 Describer: Bass, M. Hole: 167 Top of Core Depth(m) : 1166.00 Rock Type: IGNEOUS Core: 94 Sample Midpoint(m) : 1168.89 Sect/Pc #: 2/ ROCK = DIABASE OR COARSE-GRAINED BASALT SOURCE IS IR,SEE P.483,HIGHLY ALTERED; Texture: INTERGRANULAR TO INTERSERTAL,DIABASIC, Texture: URALLY COMPLEX* Phenocrysts- PLAGIOCLASE ( 5%) XENOCRYSTS,MAX >(13X7.5X7MM),CORES DIAGENETICALLY REPLACED BY MINOR KSPAR AND TRACES OF MONT AND PHILLIPSITE* Groundmass - PLAGIOCLASE ( 30.4%) Size(mm): 0.3X0.06 PYROXENE ( 9.4%) TINY IRREGULAR REMNANTS WHICH ESCAPED EXTENSIVE CONVERSION TO MONT COMPRISE MUCH OF "INTERSERTAL MONTMORILLONITE",ORIGINALLY TEXTURALLY INTERGRANULAR WITH PLAG; OPAQUE MINERALS ( 4.0%) Size(mm): 0.1X0.1 Morphology: EQUANT,SKELETAL MODAL ANALYSIS* Alteration - MONTMORILLONITE ( 42.%) Location: 9 COMBINATION ( 1.%) Location: 5 INCLUDES CALCITE+MONT PATCHES; CALCITE ( 5.%) Location: 7 FREE OF MONT; PHILLIPSITE Replacing: PLAG KFELDSPAR Replacing: PLAG Vesicles - Size(mm): 1.1X1.1 Percent: 1.2 Leg : 17 Top/Bottom Interval(mm): 780/ 840 Describer: Bass, M. Hole: 167 Top of Core Depth(m) : 1166.00 Rock Type: IGNEOUS Core: 94 Sample Midpoint(m) : 1169.81 Sect/Pc #: 3/ ROCK = APHYRIC DIABASE OR COARSE-GRAINED BASALT SOURCE IS IR,SEE PP.483-484; Texture: APHYRIC* Groundmass - PLAGIOCLASE ( 43.5%) Size(mm): 0.45X0.12 APPROX COMP AN53 TO AN67 BY CARLSBAD-ALBITE TWINS; PYROXENE ( 14.0%) Size(mm): 0.15X0.15 REMNANTS; OPAQUE MINERAL ( 3.2%) Size(mm): 0.3X0.25 OLIVINE ( 0%) MODAL ANALYSIS* Alteration - MONTMORILLONITE ( 39.3%) Replacing: PYX,PLAG,MESOSTASIS INTERSERTAL; CALCITE ( TR%) Leg : 17 Top/Bottom Interval(mm): / Describer: Bass, M. Hole: 167 Top of Core Depth(m) : 1166.00 Rock Type: IGNEOUS Core: 94 Sample Midpoint(m) : 1170.60 Sect/Pc #: CC/ ROCK = COARSE-GRAINED BASALT SOURCE IS IR ,SEE P.484; Texture: INTERSERTAL,RELATIVELY COARSE-GRAINED* Groundmass - PLAGIOCLASE (15-20%) PYROXENE ( 3%) REMNANTS; GROUNDMASS ( 80%) OPAQUE MINERALS PYRITE ( TR%) MARKS FORMER MESOSTASIS* Alteration - CALCITE Location: PATCHES MONTMORILLONITE Replacing: PYX FORMS BULK OF GROUNDMASS* Vesicles - Percent: RARE Filling: MONT Leg : 17 Top/Bottom Interval(mm): / 1 Describer: Bass, M. Hole: 167 Top of Core Depth(m) : 1166.00 Rock Type: IGNEOUS Core: 94 Sample Midpoint(m) : 1170.50 Sect/Pc #: CC/ ROCK = BASALTIC BRECCIA SOURCE IS IR, SEE P.484,CLASTS ARE COARSE- AND FINE GRAINED BASALT WITH CALCITE CEMENT; Texture: FINER-GRAINED BASALT CLASTS ARE CRUDELY VARIOLITIC* Groundmass - PLAGIOCLASE IN FINER-GRAINED BASALT OCCURS IN VAGUE RADIAL TO SUBRADIAL ARRAYS; OPAQUE MINERALS Alteration - MONTMORILLONITE Replacing: GLASS PATCHES ENCLOSE CALCITE? GRANULES; CALCITE Location: PATCHES RIMMED BY GREEN MONT* PYRITE ONE OVOID CLAST OF GREEN MONT IS MORE THAN 50% PYRITE* Leg : 17 Top/Bottom Interval(mm): 550/ Describer: Bass, M. Hole: 167 Top of Core Depth(m) : 1175.00 Rock Type: IGNEOUS Core: 95 Sample Midpoint(m) : 1175.55 Sect/Pc #: 1/ ROCK = PLAG-PYX SPARSELY PHYRIC BASALT SOURCE IS IR,SEE P. 484; Texture: PORPHYRITIC, INTERSERTAL* Phenocrysts- PLAGIOCLASE PYROXENE OLIVINE ( 0%) Groundmass - PLAGIOCLASE ( 15%) PYROXENE ( 2-3%) Morphology: GRANULAR OPAQUE MINERALS ( 8%) GROUNDMASS (56-70%) INTERSERTAL MONT AND FEATHERY PYX; PYROXENE Morphology: FEATHERY Alteration - KFELDSPAR Replacing: PLAG ALL BUT FINE RIMS OF PLAG REPLACED; MONTMORILLONITE Replacing: PLAG ALL BUT FINE RIMS OF PLAG REPLACED; MONTMORILLONITE Location: GROUNDMASS CHLOROPHAEITE CALCITE Location: AMOEBOID Location: PATCHES Vesicles - Filling: MONT Leg : 17 Top/Bottom Interval(mm): 890/ 910 Describer: Bass, M. Hole: 167 Top of Core Depth(m) : 1175.00 Rock Type: IGNEOUS Core: 95 Sample Midpoint(m) : 1175.90 Sect/Pc #: 1/ ROCK = BASALT SOURCE IS IR,SEE P. 484; Texture: GLASSY SELVAGE,ALTERED GLASS HAS CONCENTRIC COLOR LAMINATIONS OUTLINING TINY BLOCKS LIKE THOSE IN PALAG* Phenocrysts- PLAGIOCLASE ONLY 1 OBSERVED,COLORLESS,ORANGE-RED CORE* Leg : 17 Top/Bottom Interval(mm): 400/ 430 Describer: Bass, M. Hole: 167 Top of Core Depth(m) : 1175.00 Rock Type: IGNEOUS Core: 95 Sample Midpoint(m) : 1176.92 Sect/Pc #: 2/ ROCK = PLAG-PYX-OL PHYRIC BASALT SOURCE IS IR,SEE P.484; Texture: FINE-GRAINED,PHYRIC,VARIOLITIC* Phenocrysts- PLAGIOCLASE ( 2.1%) XENOCRYSTS (?),USUALLY ALL BUT A THIN RIM IS REPLACED BY KSPAR AND MONT,IN SOME CASES THE CORE SURVIVES AND AN INTERMEDIATE ONE IS REPLACED BY MONT OR THE CORE IS DISSOLVED OUT LEAVING A HOLE SURROUNDED BY A PLAG RIM; PLAGIOCLASE ( 1.5%) Size(mm): 0.22X0.40 MICROPHENOS; PYROXENE ( 1.6%) Size(mm): 0.17X0.13 OLIVINE ( 0.1%) Size(mm): 0.12X0.1 Morphology: PSEUDOMORPHS ALTERED TO MONT* Groundmass - PLAGIOCLASE ( 6.8%) Size(mm): .046X0.004 COMPONENTS OF FEATHERY VARIOLES; PYROXENE ( 44.4%) Morphology: VARIOLITIC PLUS MONT; OPAQUE MINERALS ( 13.0%) Size(mm): 0.04 Morphology: EQUANT,ELONGATE EQUANT=0.04MM MAX,ELONGATE=0.04X0.005 MAX* Alteration - KFELDSPAR Replacing: PLAG MONTMORILLONITE Replacing: PLAG,OL MONTMORILLONITE ( 14.8%) Replacing: GROUNDMASS CHLOROPHAEITE ID UNCERTAIN,MAY BE AMYGDULES* Vesicles - Filling: MONT,CHOROPH NO CONCLUSIVE EVIDENCE THESE ARE AMYGDULES-MAY BE PATCHES* |
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]
Please see NOAA's privacy and disclaimer information. Send questions or comments to mgg.info@noaa.gov.
|