Leg : 17 Top/Bottom Interval(mm): 850/ Describer: Moberly, R.
Hole: 165A Top of Core Depth(m) : 321.00 Rock Type: SEDIMENTARY
Core: 19 Sample Midpoint(m) : 321.85 Sect/Pc #: 1/
ROCK = VOLCANIC ARENITE
WELL-LAMINATED SANDSTONE,WELL-SORTED;
Texture: MEDIUM-GRAINED*
Groundmass - PALAGONITE
ANGULAR GRAINS;
GLASS
BROWN;
BASALT
OTHER
WHOLE AND BROKEN FORAMINIFERA;
PLAGIOCLASE
PYROXENE
MINERALS LISTED IN ORDER OF ABUNDANCE,GRAINS ARE
CEMENTED BY A .01 MM FRINGE OF GREEN
MONTMORILLONITE AND THE REMAINDER FILLED MAINLY
WITH CALCITE BUT PARTLY WITH SHEAVES OF RADIATING
ZEOLITE,A VOLCANIC ARENITE,PERHAPS SORTED AND
DISJOINTED BY BOTTOM CURRENT FROM A HYALOCLASTITIC
PILE IN THE NEAR VICINITY*
Alteration - CARBONATE
LARGE GRAINS OF UNKNOWN ORIGIN;
MONTMORILLONITE
ZEOLITE
Leg : 17 Top/Bottom Interval(mm): 1400/ 0 Describer: Moberly, R.
Hole: 165A Top of Core Depth(m) : 340.00 Rock Type: SEDIMENTARY
Core: 20 Sample Midpoint(m) : 342.90 Sect/Pc #: 2/
ROCK = VOLCANIC ARENITE
WELL-SORTED SANDSTONE WITH ANGULAR GRAINS OF
ALTERED TO UNALTERED BASALTS(VARIOUS COMPOSITIONS
AND TEXTURES) AND VARIOUS MINERALS;
Texture: VERY COARSE-GRAINED
1-2.5MM GRAIN SIZE*
Groundmass - PALAGONITE
COMMONLY HIGHLY VESICULAR;
PYROXENE
GLASS
BROWN;
FELDSPAR
MINERALS IN ORDER OF ABUNDANCE,GRAINS MAINLY HELD
TOGETHER BY A GREEN-BROWN MONTMORILLONITE(CEMENT?
MATRIX?) THAT HAS SILT-SIZED PYX,GLASS,PLAG,PIECES
OF RADIOLARIAN TESTS,ETC.,A COARSE VOLCANIC
ARENITE,PERHAPS DEPOSITED BY A TURBIDITY CURRENT
OR LARGE SLUMP FROM A NEARBY HYALOCLASTIC PILE*
Alteration - ZEOLITE
Location: SMALL+LARGE
Location: PATCHES
SHEAF-LIKE*
Leg : 17 Top/Bottom Interval(mm): 1350/ Describer: Bass, M.
Hole: 165A Top of Core Depth(m) : 424.00 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 425.35 Sect/Pc #: 1/
ROCK = PLAG-CPX-OL MODERATELY MICROPHYRIC BASALT
SOURCE IS IR, SEE P. 477;
Texture: FINE-GRAINED,MICROPHYRIC*
Phenocrysts- PLAGIOCLASE ( 1.5%)
MIN/MAX SIZE 1.2X0.07/4.0X3.0,LARGELY REPLACED
BY ISOTROPIC MATERIAL (ANALCITE?EPOXY?) AND
CROSSED BY IRREGULAR VEINS OF A BIFREFRINGENT
MINERAL,MINOR REPLACEMENT BY MONT;
PLAGIOCLASE ( 2.4%)
Size(mm): 0.1X0.08
CORES PARTLY REPLACED BY KSPAR;
PYROXENE ( 2.7%)
MICROPHENOS;
OPAQUE MINERALS ( 1.2%)
Morphology: EQUANT
MICROPHENOS;
AMPHIBOLE ( TR%)
Size(mm): 0.04X0.01
MICROPHENOS,SEEN ONLY IN GLOMEROCRYSTS OR
XENOLITHS;
OLIVINE ( 0.4%)
Size(mm): 0.35X0.17 Morphology: PSEUDOMORPHS
Groundmass - OPAQUE MINERALS ( 12.2%)
Size(mm): 0.003
GROUNDMASS ( 75.3%)
EXCEPT OPAQUE GRAINS,INCLUDES GREEN MICACEOUS
MATERIAL (MICA?,CHLORITE?,MONT?)+LESS PYX+MINOR
PLAG+AMPH?;
AMPHIBOLE ( 0.15%)
BROWN,ALONG SEAMS;
KFELDSPAR ( TR%)
MODAL ANALYSIS,PLAG+PYX+OPAQUE "MICROPHENOS" FORM
GLOMEROCRYSTS OR XENOLITHS TO 3.0MMX4.0MM*
Alteration - APATITE ( TR%)
NEEDLES;
MONTMORILLONITE
ANALCITE
ID UNCERTAIN;
MICA
ID UNCERTAIN;
CHLORITE
ID UNCERTAIN*
Vesicles -
Size(mm): 1.1
Percent: 3
VESICULAR,FILLED*
Leg : 17 Top/Bottom Interval(mm): 1350/ 0 Describer: Moberly, R.
Hole: 165A Top of Core Depth(m) : 424.00 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 425.35 Sect/Pc #: 1/
ROCK = BASALT;
Texture: GLOMEROPHYRIC,INTERSERTAL*
Phenocrysts- PLAGIOCLASE
Size(mm): TO .6
AUGITE
Size(mm): TO .6
OPAQUE MINERALS
Size(mm): .07 Morphology: LATHS
Groundmass - PLAGIOCLASE
PYROXENE
GLASS
OPAQUE MINERALS
Morphology: EQUANT
OLIVINE
SERPENTINE PSEUDOMORPHS OF OL IN SOME OF THE
GLOMERITIC MASSES*
Vesicles -
Size(mm): TO 1.1
VESICLES .25 MM COMMON,RIMMED WITH CHLORITE*
Leg : 17 Top/Bottom Interval(mm): 1170/ 0 Describer: Moberly, R.
Hole: 165A Top of Core Depth(m) : 452.00 Rock Type: IGNEOUS
Core: 24 Sample Midpoint(m) : 453.17 Sect/Pc #: 1/
ROCK = PLAG-AUGITE PHYRIC BASALT GLASS
BLACK OPAQUE;
Texture: VITROPHYRIC,VESICULAR,FLOW-BANDED*
Phenocrysts- PLAGIOCLASE
AUGITE ( 10%)
TOTAL PHENO % IS 10%,SIZE MAINLY .5X.2MM,TO 1MM*
Vesicles -
Size(mm): .2-1.8
Percent: 5
Filling: AMYGDULES
NOW MAINLY FILLED WITH AMYGDULES OF CALCITE,
CHLORITE,CHALCEDONY OR MONTMORILLONITE SOMETIMES
IN COMBINATIONS OF CHALCEDONY,RIMMING
MONTMORILLONITE ON ONE SIDE OF 1.5 CM THICK GLASS
IS COARSELY XTLLINE CALCITE,WITH ABUNDANT CLAY,
PRESUMABLY CONTACT METAMORPHOSED SEDIMENT,ON OTHER
SIDE AS CHLORITIZED,VESICULAR,PLAG-OPAQUE-
SUBORDINATE AUGITE BASALT,ELSEWHERE THE BASALT
NEARLY CONTACTS THE CARBONATE*
Leg : 17 Top/Bottom Interval(mm): 1170/1210 Describer: Bass, M.
Hole: 165A Top of Core Depth(m) : 452.00 Rock Type: IGNEOUS
Core: 24 Sample Midpoint(m) : 453.19 Sect/Pc #: 1/
ROCK = PLAG-PYX MODERATELY PHYRIC BASALT
SOURCE IS IR,ALTERED GLASSY ROCK,HOST,SEE P.478;
Texture: FINELY FLOW BANDED,PHYRIC,GLASSY*
Phenocrysts- PLAGIOCLASE ( 3.5%)
Size(mm): 0.55X0.25
CORES OR IRREGULARLY DISTRIBUTED PATCHES ALTERED
TO KSPAR+RARE MONT(?) + ZEOLITE(?)+ANALCITE(?);
PYROXENE ( 1.5%)
Size(mm): 0.2X0.1
Groundmass - GLASS ( 88.7%)
ALTERED,DARK BROWN,CONTAINS MATS OF VERY FINE-
GRAINED OPAQUE PLATES (PROBABLY ILMENITE);
OLIVINE ( 1.7%)
Size(mm): 0.4X0.3 Morphology: PSEUDOMORPHS
ID UNCERTAIN;
OPAQUE MINERALS ( 0.2%)
GENERALLY ALTERED TO TRANSLUCENT RED FE.OXIDES;
ILMENITE
ID UNCERTAIN,MODAL ANALYSIS*
Alteration - MONTMORILLONITE
Replacing: OL
CALCITE
Replacing: OL
KFELDSPAR
Location: CORES Replacing: PLAG
FERROUS OXIDE
Replacing: OP.MINS
Vesicles -
Percent: 1.2
Filling: CALCITE
0.15 TO 0.85;
Size(mm): 0.25
Percent: 3.2
Filling: MONT
MAY HAVE COLORLESS VERY FINE-GRAINED RIM OF
CHALCEDONY(?) OR A CALCITE CORE*
Leg : 17 Top/Bottom Interval(mm): 1170/1211 Describer: Bass, M.
Hole: 165A Top of Core Depth(m) : 452.00 Rock Type: IGNEOUS
Core: 24 Sample Midpoint(m) : 453.19 Sect/Pc #: 1/
ROCK = XENOLITH (INCLUSION)
SOURCE IS IR,INCLUSION IN HOST ROCK,SEE P.478;
Texture: FINE-GRAINED*
Phenocrysts- PLAGIOCLASE ( 1%)
INCLUDES TRACE OF SECONDARY KSPAR,MIN 0.65X0.3,
MAX 1.8X1.5MM;
PYROXENE ( 0.1%)
MIN 0.4X0.35,MAX 0.6X0.45MM*
Groundmass - PLAGIOCLASE ( 36.%)
MIN 0.1X0.03,MAX 0.5 X0.05,CORES PARTLY ALTERED TO
KSPAR AND POSSIBLY A ZEOLITE;
PYROXENE ( 27.3%)
Size(mm): .015X0.015 Morphology: PRISMATIC,EQUANT
OPAQUE MINERALS ( 16.7%)
Size(mm): .1
TITANOMAGNETITE,MODAL ANALYSIS*
Alteration - AMPHIBOLE ( 2.5%)
EQUANT,DIMENSIONS 0.35X0.04,0.2X0.17,PROBABLY
KAERSUTITIC;
MICA ( 12.8%)
Location: INTERSTITIAL
CALCITE ( 0.9%)
APATITE ( 2.6%)
Leg : 17 Top/Bottom Interval(mm): 1170/1212 Describer: Bass, M.
Hole: 165A Top of Core Depth(m) : 452.00 Rock Type: IGNEOUS
Core: 24 Sample Midpoint(m) : 453.19 Sect/Pc #: 1/
ROCK = INCLUSION (PEGMATOID PODS)
SOURCE IS IR,SEE PP.478-479*
Groundmass - PLAGIOCLASE ( 41.9%)
Size(mm): 0.35X0.08
LITTLE OR NO REPLACEMENT BY KSPAR,OFTEN CONTAINS
APPARENT MIAROLITE CAVITIES LINED BY XTLS WITH
RHOMBOID TERMINATIONS;
PYROXENE ( 7.9%)
Size(mm): 0.14X0.08
HORNBLENDE ( 17.0%)
Size(mm): 0.5X0.1
OPAQUE MINERALS ( 5.3%)
Size(mm): 0.12X0.1 Morphology: SKELETAL
OPAQUE MINERALS ( 5.6%)
Size(mm): 0.04X<0.01 Morphology: FINE,PLATY,GRAINS
MODAL ANALYSIS*
Alteration - CALCITE ( 10.6%)
Location: PATCHES
0.5 MAX, IRREGULAR,NOT AMYGDULES,DOES NOT REPLACE
OTHER MINERALS AND IS POSSIBLY MAGMATIC;
MICA ( 7.0%)
APATITE ( 4.7%)
0.3X0.02 MAX*
Leg : 17 Top/Bottom Interval(mm): 800/ Describer: Bass, M.
Hole: 165A Top of Core Depth(m) : 480.00 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 482.30 Sect/Pc #: 2/
ROCK = BASALT
SOURCE IS IR, SEE P.479;
Texture: RELATIVELY COARSE-GRAINED*
Groundmass - COMBINATION ( 18.6%)
Size(mm): 0.2X0.03
INCLUDES PLAG+ALKALI FELDSPAR,ALL BUT NARROW RIMS
ALTERED TO LIGHT GREEN ISOTROPIC CHLORITE AND
KSPAR;
PYROXENE ( 20.0%)
MIN 0.1X0.1,MAX 0.3X0.15,MINOR ALTERATION TO LIGHT
GREEN CHLORITE LIKE THAT WHICH REPLACES PLAG;
HORNBLENDE ( 13.4%)
PROBABLY KAERSUTITIC,OFTEN MANTLES PYX,
MIN 0.05X0.05,MAX 0.3X0.05;
OPAQUE MINERALS ( 13.6%)
Size(mm): 1.2X0.03
MODAL ANALYSIS*
Alteration - COMBINATION ( 31.6%)
INCLUDES CHLORITE+KSPAR+APATITE,PASTY MIXTURE;
BIOTITE ( 2.5%)
Vesicles -
Percent: 0.3
Filling: CHLORITE,MONT
Leg : 17 Top/Bottom Interval(mm): 800/ 0 Describer: Moberly, R.
Hole: 165A Top of Core Depth(m) : 480.00 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 482.30 Sect/Pc #: 2/
ROCK = BASALT;
Texture: APHANITIC,INTERSERTAL,SPILITIC*
Groundmass - AUGITE
Size(mm): .2X.07
SURROUNDED BY SHEAVES AND IRREGULAR MASSES OF
ALBITE AND CHLORITE;
OPAQUE MINERALS
Morphology: PLATY-SKELETAL
Leg : 17 Top/Bottom Interval(mm): 800/ 840 Describer: Bass, M.
Hole: 165A Top of Core Depth(m) : 480.00 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 482.32 Sect/Pc #: 2/
ROCK = BASALT
SOURCE IS IR,SEE PP.479-480;
Texture: FINE-GRAINED*
Groundmass - COMBINATION ( 29.6%)
INCLUDES PLAG+ALKALI FELDSPAR,MIN 0.09X0.02,
MAX 0.6X0.3MM,TINY PATCHES OF DIAGENETIC
ESSENTIALLY PURE KSPAR UNCOMMONLY REPLACE PLAG
CORES,MORE COMMONLY THE PLAG CORES ARE REPLACED
BY MICACEOUS MATERIAL WHICH IS EITHER GREEN LIKE
THE GROUNDMASS OR DEEP RED BROWN LIKE VESICLE
LININGS;
Alteration - BIOTITE ( 9.3%)
GROUNDMASS ( 14.3%)
GREEN MICACEOUS,ENCLOSES RARE BROWNISH CARB GRAINS
WITH HIGH INDICES OF REFRACTION WHICH MAY BE
SIDERITE;
OTHER ( 2.8%)
RED BROWN AGGREGATES;
APATITE ( 2.1%)
CALCITE ( 0.2%)
Location: INTERSTITIAL
OTHER ( 0.5%)
BLEBS IN PLAG*
Vesicles -
Size(mm): 0.1
Percent: 1.6
Leg : 17 Top/Bottom Interval(mm): 600/ 650 Describer: Bass, M.
Hole: 165A Top of Core Depth(m) : 485.00 Rock Type: IGNEOUS
Core: 27 Sample Midpoint(m) : 487.13 Sect/Pc #: 2/
ROCK = BASALT
SOURCE IS IR,SEE P.480;
Texture: FINE-GRAINED,SLIGHTLY PORPHYRITIC*
Phenocrysts- PLAGIOCLASE ( 13.2%)
Size(mm): 0.1X0.1
REMNANTS,MIN 0.7X0.85,MAX 2.0X0.55,GROUNDMASS
PLAG:MIN 0.07X0.03,MAX 0.7X0.13*
Groundmass - PYROXENE ( 24.4%)
Size(mm): 0.2X0.1
MIN 0.03X0.03,MAX 0.55X0.3;
HORNBLENDE ( 10.5%)
Size(mm): 0.14X0.03
LATER THAN AND IN SOME CASES MANTLED ONTO PYX;
OPAQUE MINERALS ( 16.6%)
Morphology: PLATY,EQUANT
PLATY XTLS 0.13X0.01,EQUANT+XTLS 0.1X0.09,
MODAL ANALYSIS*
Alteration - COMBINATION ( 19.0%)
Replacing: PLAG
INCLUDES KSPAR(?)+ZEOLITES+ANALCITE(POSSIBLY),
ZEOLITES PROBABLY ARE CHABAZITE+GMELINITE WITH
POSSIBLY NATROLITE;
OTHER ( 13.1%)
SECONDARY FLAKY MINERALS,INCLUDES MAINLY MICA+
CHLORITE+MONT (IN TRACE AMOUNTS);
BIOTITE ( 0.6%)
DEEP RED BROWN FLAKES IN INTERSTITIAL PATCHES OF
FIBROUS ZEOLITE;
ZEOLITE ( 1.5%)
FIBROUS ZEOLITE;
CALCITE ( 0.5%)
Location: PATCHES
ALONE OR WITH FIBROUS ZEOLITE;
APATITE ( 0.5%)
Leg : 17 Top/Bottom Interval(mm): / Describer: Bass, M.
Hole: 165A Top of Core Depth(m) : 485.00 Rock Type: IGNEOUS
Core: 27 Sample Midpoint(m) : 491.10 Sect/Pc #: CC/
ROCK = BASALT
SOURCE IS IR,SEE P.480;
Texture: FINE-GRAINED,SERIATE*
Phenocrysts- TITANAUGITE ( <3.7%)
HORNBLENDE ( <3.7%)
PLAGIOCLASE
COMPLETELY REPLACED BY ZEOLITE EXCEPT FOR THIN
DISCONTINUOUS HIGHLY ZONED RIMS WITH SMALL
EXTINCTION ANGLES*
MEDIUM OLIVE-GREEN,FLAKY AND PROBABLY COMPOSED OF
MICA+CHLORITE+MINOR MONT*
Alteration - ZEOLITE
Replacing: PLAG
MICA
Location: GROUNDMASS
CHLORITE
Location: GROUNDMASS
MONTMORILLONITE
Location: GROUNDMASS
APATITE
PROJECT THROUGH ALL MINERALS;
KFELDSPAR
Replacing: PLAG
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