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
|
