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*
|
