Leg : 37 Top/Bottom Interval(mm): 570/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 102.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 104.07 Sect/Pc #: 2/PCE 2
ROCK = PLAG-CPX SPARSELY MICROPHYRIC BASALT;
Texture: INTERGRANULAR,HOLOCRYSTALLINE*
Phenocrysts- AUGITE ( <1%)
Size(mm): 0.2-0.6 Morphology: EUHEDRAL
FRESH,CLEAN EXTINCTION;
PLAGIOCLASE ( <1%)
Size(mm): 0.2-0.6
FRESH,GOOD FOR PROBE*
Groundmass - OLIVINE ( 1%)
Size(mm): 0.02
FRESH;
PLAGIOCLASE
Size(mm): 0.02
PYROXENE
Size(mm): 0.02
MAGNETITE
Size(mm): 0.02
Alteration - CARBONATE
Location: VEIN
Vesicles -
Filling: SMEC,CARB,
Filling: CHLOROPH
Leg : 37 Top/Bottom Interval(mm): 920/ 940 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 102.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 104.43 Sect/Pc #: 2/
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: VARIOLITIC,INTERGRANULAR,INTERSERTAL
NOT STRICTLY VARIOLITIC BUT THERE ARE RADICAL
SHEAF-SHAPED CRYSTAL GRAINS STRONGLY SUGGESTIVE
OF INITIAL VARIOLITIC GROWTH FOLLOWED BY SLOWER
MORE NORMAL CRYSTALLIZATION,PARTICULARLY EVIDENT
NEAR SOME OF THE PHENOCRYSTS*
Phenocrysts- PLAGIOCLASE ( >5%)
Size(mm): >0.5
FRESH,APPROX COMP AN80,STRIKINGLY HOMOGENEOUS IN
COMPOSITION WITH SLIGHTLY MORE SIALIC RIMS(SHARP
CONTRAST-VERY THIN RIMS INTERGROWN WITH THE
GROUNDMASS)*
Groundmass - PLAGIOCLASE
APPROX COMP AN70-75,HAS SMALL ROUND INCLUSIONS OF
CLAY MINS(ALTERED GLASS?);
GLASS
INTERSTITIAL GLASS IS TOTALLY ALTERED AND HAS
SMALL SKELETAL MAGNETITE,DISTRIBUTED THROUGHOUT
SLIDE IN ALL INTERSTITIAL PARTS AND CONCENTRATED
ABOUT VESICLES-PARTICULARLY LARGE ONES OR CLUMPS,
ALSO IN BANDS JOINING THE VESICLES;
SMECTITE
SMEC SPHERULITES PARTICULARLY ABUNDANT IN THE SAME
INTERSTITIAL AND VESICLE AREAS AS GLASS;
PYROXENE
MAGNETITE
Alteration - SMECTITE
Replacing: GLASS
SMEC SPHERULITES PARTICULARLY ABUNDANT IN AREAS
WHERE GLASS IS CONCENTRATED ABOUT VESICLES;
OTHER
Replacing: GLASS
INCLUDES MANY FINE-GRAINED MINERALS;
CARBONATE ( TR%)
Replacing: GROUNDMASS
Vesicles -
Filling: SMEC,SILICA
SMEC NEXT TO WALL-THEN SILICA(?),ARE SOME VESICLES
AFFECTING COOLING RATE(?)-GLASS IS CONCENTRATED
ABOUT VESICLES-PARTICULARLY LARGE ONES OR CLUMPS*
Leg : 37 Top/Bottom Interval(mm): 920/ 940 Describer: Melson, W.
Hole: 332A Top of Core Depth(m) : 102.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 104.43 Sect/Pc #: 2/
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: INTERGRANULAR,PORPHYRITIC*
Phenocrysts- PLAGIOCLASE ( 30%)
Size(mm): >0.5
FRESH,VERY ABUNDANT PLAG PHENOCRYSTS,WEAKLY ZONED
EXCEPT AT OUTERMOST PORTIONS,QUENCH OVERGROWTH,
SIZE UP TO 1 CM ACROSS*
Groundmass - SMECTITE
MESOSTASIS LARGELY REPLACED BY SMEC,ALSO THROUGH
GROUNDMASS AND PLAG PHENOS,AT LEAST TWO VARIETIES-
COLORLESS OR YELLOW-BOTH BIREFRINGENT AND PLATY,IN
VEIN FILLING + INTERSTICES;
OXIDES ( <5%)
INTERSTITIAL SKELETAL OXIDE;
PLAGIOCLASE
PYROXENE
MAGNETITE
Alteration - SMECTITE
Location: GROUNDMASS Replacing: GROUNDMASS
MESOSTASIS LARGELY REPLACED BY SMEC,AT LEAST TWO
VARIETIES-COLORLESS AND YELLOW-BOTH PLATY;
SILICA
Location: GROUNDMASS Replacing: GROUNDMASS
SMECTITE
Location: VEINS,
Location: INTERSTICES
IN VEINLETS AND THROUGH PLAG PHENOS,BIREFRINGENT
AND PLATY*
Vesicles -
Size(mm): TO 10
Percent: 5
ONE VESICLE IS 25MM*
Leg : 37 Top/Bottom Interval(mm): 1170/ 0 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 102.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 104.67 Sect/Pc #: 2/PCE 12D
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: SUBOPHITIC,INTERGRANULAR,GLASSY*
Phenocrysts- PLAGIOCLASE ( >5%)
Size(mm): >0.5 Morphology: LATHS
APPROX COMP AN66*
Groundmass - OLIVINE ( 5%)
Size(mm): 0.01-0.1 Morphology: EQUANT
OL MICROLITES ARE RELATIVELY EQUANT,2VZ 85;
PLAGIOCLASE ( 40%)
Size(mm): 0.01-0.1
PYROXENE ( 40%)
Size(mm): 0.01-0.1 Morphology: ANHEDRAL
INTERSTITIAL;
GLASS ( 8%)
ALTERED GLASS OCCURS IN SMALL INTERSTITIAL PATCHES
THROUGHOUT THE SLIDE;
MAGNETITE ( 2%)
Morphology: SKELETAL
ALL OF THE MAGNETITE IS SKELETAL AND IS CONFINED
TO THE ALTERED GLASS PATCHES*
Alteration - SMECTITE
Replacing: GROUNDMASS
CHLOROPHAEITE
Replacing: GROUNDMASS
OTHER
Replacing: GLASS
ALTERED GLASS OCCURS IN SMALL INTERSTITIAL PATCHES
THROUGHOUT THE SLIDE;
SMECTITE
Location: VEINS
Vesicles -
Size(mm): 0.01
Percent: 1
Filling: SMEC,CARB,
Filling: CHLOROPH
SMEC + CHLOROPH IS 1%-CARB IS ONLY A TRACE*
Leg : 37 Top/Bottom Interval(mm): 1170/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 102.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 104.67 Sect/Pc #: 2/PCE 12
ROCK = PLAGIOCLASE PHYRIC BASALT
SLIGHTLY ALTERED;
Texture: INTERGRANULAR,GLASSY*
Phenocrysts- PLAGIOCLASE ( >5%)
Size(mm): 5.0-10.0
FRESH,PHENOS HAVE WAVY EXTINCTION(STRAIN?),
SLIGHTLY ZONED ON MARGINS,APPROX COMP LABRADORITE;
OLIVINE ( TR%)
FRESH*
Groundmass - OLIVINE ( 2-3%)
Size(mm): 0.01-0.1
PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
APPROX COMP AUGITE;
MAGNETITE
Size(mm): 0.1-1.0
GLASS
ALTERED*
Alteration - CHLOROPHAEITE ( TR%)
Replacing: GROUNDMASS
YELLOW-GOLD;
SILICA ( TR%)
Location: VEINS, Replacing: GROUNDMASS
Location: GROUNDMASS
MICROCRYSTALLINE SILICA,FOUND IN GROUNDMASS AND
TINY VEINLETS;
SMECTITE ( TR%)
Location: INTERSTITIAL, Replacing: GLASS
Location: VEINS
Vesicles -
Size(mm): 0.1-0.2
Percent: 1
Filling: SMEC,CARB
Leg : 37 Top/Bottom Interval(mm): 80/ 110 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 111.50 Rock Type: IGNEOUS
Core: 7 Sample Midpoint(m) : 111.60 Sect/Pc #: 1/
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): <0.5
FRESH*
Groundmass - PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
MAGNETITE
Alteration - SMECTITE ( <5%)
Replacing: GROUNDMASS
Vesicles -
Size(mm): 0.01-1.0
Percent: 10
Filling: SMEC,CARB
Leg : 37 Top/Bottom Interval(mm): 80/ 110 Describer: Robinson, P.
Hole: 332A Top of Core Depth(m) : 111.50 Rock Type: IGNEOUS
Core: 7 Sample Midpoint(m) : 111.60 Sect/Pc #: 1/
ROCK = PLAGIOCLASE SPARSELY PHYRIC BASALT
POORLY CRYSTALLIZED GROUNDMASS;
Texture: INTERGRANULAR,TRACHYTOID
INTERGRANULAR GRADING INTO INTERSERTAL,ONLY
SLIGHTLY TRACHYTOID,VERY SPARSELY PHYRIC*
Phenocrysts- PLAGIOCLASE ( <1%)
FRESH,ZONED NEAR MARGINS*
Groundmass - PLAGIOCLASE
Size(mm): 0.01-1.0
PYROXENE
Size(mm): 0.01-1.0
FIBROUS AND POORLY CRYSTALLIZED;
MAGNETITE
Size(mm): 0.01-1.0
POORLY CRYSTALLIZED;
MICROCRYST GROUNDMASS
SOME MICROXLN MATERIAL-INDETERMINATE*
Alteration - SMECTITE
Location: INTERSTICES Replacing: GROUNDMASS
SILICA
Location: INTERSTICES Replacing: GROUNDMASS
MICROXLN;
CARBONATE
Location: INTERSTICES Replacing: GROUNDMASS
CHLOROPHAEITE
Location: INTERSTICES Replacing: GROUNDMASS
Vesicles -
Size(mm): 0.1-0.3
Percent: 1-2
Filling: SMEC,CARB,
Filling: CHLOROPH,SILICA
SMEC NEXT TO WALL-THEN SILICA-THEN CARB(MOSTLY),
SILICA IS MICROXLN WITH A BROWNISH-BLACK OPAQUE
MATERIAL,MANY OPEN VESICLES*
Leg : 37 Top/Bottom Interval(mm): 410/ 430 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 111.50 Rock Type: IGNEOUS
Core: 7 Sample Midpoint(m) : 111.92 Sect/Pc #: 1/PCE 5
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: SUBOPHITIC,INTERGRANULAR,GLASSY*
Phenocrysts- PLAGIOCLASE ( >5%)
Size(mm): >0.5
FRESH,APPROX COMP AN95,THIN OUTER RIMS INTERGROWN
WITH GROUNDMASS,ZONED;
PYROXENE ( <1%)
FRESH,APPROX COMP AUGITE*
Groundmass - PYROXENE ( 49%)
Size(mm): 0.1-1.0
PLAGIOCLASE ( 35%)
Size(mm): 0.1-1.0
APPROX COMP AN70;
OLIVINE ( 5%)
MAGNETITE ( 1%)
SKELETAL MAGN OCCURS STRICTLY IN ALTERED
INTERSTITIAL GLASS PATCHES;
GLASS ( 10%)
ALTERED*
Alteration - CHLOROPHAEITE ( 5%)
Replacing: GLASS
COMBINATION
INCLUDES CALCITE + CARB + SMEC + HEMATITE +
ANALCIME(?),ANALCIME(?) PRECEDED CALCITE IN VEIN-
ID QUESTIONABLE-MINERAL SHOWS PRISMATIC GROWTH,
VEIN CUTS ACROSS VESICLES AND WAS FORMED AFTER
SMEC LINING OF VESICLES,SEQUENCE OF FORMATION IS
SMEC-HEMATITE-CALCITE-ANALCIME(?)-MORE CALCITE*
Vesicles -
Size(mm): 0.15
Percent: 3
Filling: SMEC,CARB
SMEC NEXT TO WALL-THEN CARB*
Leg : 37 Top/Bottom Interval(mm): 660/ 690 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 111.50 Rock Type: IGNEOUS
Core: 7 Sample Midpoint(m) : 112.18 Sect/Pc #: 1/PCE 8
ROCK = PLAG PHYRIC BASALT;
Groundmass - MAGNETITE ( 1%)
MAGN IS PRIMARILY SKELETAL ALTHOUGH SOME OF THE
GRAINS ARE FAIRLY WELL FILLED IN,A FEW HAVE
STARTED TO ALTER TO HEMATITE*
Alteration - HEMATITE ( TR%)
Replacing: GROUNDMASS
A FEW SKELETAL MAGN STARTED TO ALTER TO HEMATITE*
Vesicles -
Percent: TR
Filling: CARB
ONE FILLED VESICLE*
Leg : 37 Top/Bottom Interval(mm): 660/ 690 Describer: Robinson, P.
Hole: 332A Top of Core Depth(m) : 111.50 Rock Type: IGNEOUS
Core: 7 Sample Midpoint(m) : 112.18 Sect/Pc #: 1/PCE 8
ROCK = PLAGIOCLASE PHYRIC BASALT
SLIGHTLY ALTERED;
Texture: INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( >5%)
Size(mm): 1.0-12.0 Morphology: EUHEDRAL
FRESH,PLAG IS UNZONED LABRADORITE-NARROW MARGINAL
ZONE,MOSTLY EUHEDRAL XTLS*
Groundmass - PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
APPROX COMP AUGITE;
MAGNETITE
Alteration - SMECTITE ( TR%)
Replacing: GROUNDMASS
YELLOW;
CARBONATE ( TR%)
Replacing: GROUNDMASS
OTHER
Replacing: GROUNDMASS
MICROCRYSTALLINE SILICA(?);
SMECTITE
Location: VEINS
VERY TINY VEINLETS*
Vesicles -
Size(mm): 0.1-1.0
Percent: 1-2
Filling: SILICA
MOSTLY MICROCRYSTALLINE SILICA W/SOME TRIDYMITE*
Leg : 37 Top/Bottom Interval(mm): 660/ 690 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 111.50 Rock Type: IGNEOUS
Core: 7 Sample Midpoint(m) : 112.18 Sect/Pc #: 1/PCE 8
ROCK = PLAGIOCLASE PHYRIC BASALT
SLIGHTLY ALTERED;
Texture: INTERGRANULAR,GLASSY*
Phenocrysts- PLAGIOCLASE ( 20%)
Size(mm): TO 8.0 Morphology: EUHEDRAL
EUHEDRAL PLAG PHENOS UNZONED EXCEPT FOR THIN RIM
(QUENCH?),WELL TWINNED;
PYROXENE
APPROX COMP AUGITE,FRESH*
Groundmass - GLASS
ALTERED;
PLAGIOCLASE
PYROXENE
ILMENITE
POORLY CRYSTALLIZED*
Alteration - SMECTITE
Replacing: GLASS
SERICITE
Replacing: PLAG PHENOS
SLIGHT SERICITE ON PLAG*
Vesicles -
Size(mm): <0.3
Percent: <1
Filling: SMEC,CARB,
Filling: SILICA
MANY OPEN VESICLES*
Leg : 37 Top/Bottom Interval(mm): 1250/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 111.50 Rock Type: IGNEOUS
Core: 7 Sample Midpoint(m) : 112.75 Sect/Pc #: 1/
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: INTERGRANULAR,TRACHYTOID,GLASSY*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): TO 0.8
FRESH*
Groundmass - PYROXENE
Size(mm): 0.01-0.1
SMALL XTLS LOOK LIKE OLIVINE BUT HAVE WAVY
EXTINCTION AND ARE THEREFORE CPX;
PLAGIOCLASE
Size(mm): 0.01-0.1
MAGNETITE
GLASS
FRESH AND BROWN,OXIDIZED*
Alteration - CARBONATE
Location: VEINS
ZEOLITE
Location: VEINS
Vesicles -
Filling: SMEC,CARB
Leg : 37 Top/Bottom Interval(mm): 70/ 100 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 111.50 Rock Type: IGNEOUS
Core: 7 Sample Midpoint(m) : 113.09 Sect/Pc #: 2/
ROCK = PLAG SPARSELY PHYRIC BASALT
GOOD SECTION TO PROBE INTERSTITIAL GLASS,GOOD FOR
CHEMISTRY;
Texture: INTERGRANULAR,TRACHYTOID*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): TO 1.2
FRESH,ONE CLOT IS 0.5MM,1.2MM ONES ARE 1X1*
Groundmass - GLASS
FRESH,GOOD SECTION TO PROBE INTERSTITIAL GLASS;
PLAGIOCLASE
Size(mm): 0.01-0.1
PYROXENE
GROUNDMASS PYX HAS WAVY EXTINCTION;
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE,POORLY FORMED*
Alteration - SERICITE
Replacing: PLAG PHENOS
SMECTITE
Replacing: GROUNDMASS
OTHER
Replacing: GROUNDMASS
WHITE MICA(?)*
Vesicles -
Size(mm): TO 5.0
Percent: <1
Filling: SMEC,MICA
WHITE MICA(?)*
Leg : 37 Top/Bottom Interval(mm): 410/ 440 Describer: Melson, W.
Hole: 332A Top of Core Depth(m) : 111.50 Rock Type: IGNEOUS
Core: 7 Sample Midpoint(m) : 113.43 Sect/Pc #: 2/PCE 23
ROCK = APHYRIC BASALT;
Texture: INTERGRANULAR,APHYRIC*
Groundmass - GLASS
INTERSTITIAL GLASS WITH OXIDES;
OXIDES
WITH INTERSTITIAL GLASS*
Alteration - SMECTITE
Location: INTERSTICES
IN GROUNDMASS PORES*
Vesicles -
Size(mm): 5.0-10.0
Percent: 5
Filling: SMEC,GOETHITE
YELLOW SMEC PARTLY FILLS VESICLES-OCCURS ONLY ON
ONE SIDE OF SECTION PRESUMABLY ALONG ALTERED ZONE,
BROWNISH-ORANGE DENSE BUT TRANSLUCENT MINERAL
FILLS CENTERS OF ZONE VESICLES IN ALTERED ZONE*
Leg : 37 Top/Bottom Interval(mm): 410/ 440 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 111.50 Rock Type: IGNEOUS
Core: 7 Sample Midpoint(m) : 113.43 Sect/Pc #: 2/PCE 23
ROCK = APHYRIC BASALT
TWO BANDS OF MATERIAL-THE LIGHT BAND IS RELATIVELY
FRESH AND THE DARK BAND IS MORE ALTERED WITH LOTS
OF SMECTITE;
Texture: INTERGRANULAR*
Phenocrysts- PLAGIOCLASE
THERE IS ONE PLAG XTL OF 0.4MM BUT MOST OF THE
ROCK IS APHYRIC*
Groundmass - PLAGIOCLASE
Size(mm): 0.01-0.1
PYROXENE
Size(mm): 0.01-0.1
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN,BOTH POORLY FORMED*
Alteration - SMECTITE
Location: INTERSTICES Replacing: GROUNDMASS
DARK BANDS OF ROCK ARE MORE ALTERED-LOTS OF SMEC*
Vesicles -
Filling: SMEC,CARB
Leg : 37 Top/Bottom Interval(mm): 90/ 170 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 121.00 Rock Type: IGNEOUS
Core: 8 Sample Midpoint(m) : 121.13 Sect/Pc #: 1/PCE 2
ROCK = PLAG SPARSELY PHYRIC BASALT
SECTION CROSSED BY A BAND OF ALTERATION,LOCALIZED
GROUNDMASS SMEC + CHLORPH;
Texture: INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): <0.5
PLAG PHENOS FAINTLY ZONED(NORMALLY),FRESH;
OLIVINE ( TR%)
FRESH*
Groundmass - PLAGIOCLASE
Size(mm): 0.1-1.0
CLINOPYROXENE
Size(mm): 0.1-1.0
MAGNETITE
Alteration - SMECTITE
Replacing: GROUNDMASS
SECTION CROSSED BY A BAND OF ALTERATION;
CHLOROPHAEITE
Replacing: GROUNDMASS
SECTION CROSSED BY A BAND OF ALTERATION*
Vesicles -
Size(mm): 2.0-3.0
Percent: 3
Filling: SMEC,CHLOROPH
ONLY TRACE SMEC,BOTH ONLY PARTLY FILLING VESICLES*
Leg : 37 Top/Bottom Interval(mm): 260/ 310 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 121.00 Rock Type: IGNEOUS
Core: 8 Sample Midpoint(m) : 121.29 Sect/Pc #: 1/PCE 4
ROCK = PLAG MODERATELY PHYRIC BASALT
TWO THICK(3-15MM) AND ONE THIN(1MM) BANDS OF
ALTERATION(AS IN CORE 8-1 #2) AS EVIDENCED IN THE
CROSS SECTION BY CHLOROPHAEITE VESICLE FILLING AND
ALSO INTERSTITIAL REPLACEMENT;
Texture: INTERGRANULAR;
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): <0.5
FRESH*
Groundmass - PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
MAGNETITE
Alteration - CHLOROPHAEITE
Replacing: GROUNDMASS
SMECTITE
Replacing: GROUNDMASS
Vesicles -
Size(mm): 2
Percent: 5
Filling: SMEC,CARB,
Filling: CHLOROPH
ZEOLITE POSSIBLY A FILLING*
Leg : 37 Top/Bottom Interval(mm): 950/ 980 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 121.00 Rock Type: IGNEOUS
Core: 8 Sample Midpoint(m) : 121.97 Sect/Pc #: 1/PCE 11
ROCK = APHYRIC BASALT
SLIGHTLY ALTERED;
Texture: INTERGRANULAR,APHANITIC-CRYPTOCRYSTALLINE;
Phenocrysts- PLAGIOCLASE ( TR%)
MICROPHENOS,FRESH,ONE CLOT IS 0.2MM;
CLINOPYROXENE ( TR%)
MICROPHENOS,FRESH*
Groundmass - PLAGIOCLASE
Size(mm): 0.01-0.1
PYROXENE
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
YELLOW*
Vesicles -
Size(mm): 4.0-10.0
Percent: 1-2
Filling: SMEC,OP.MIN
OPAQUE MINERAL ON RIM*
Leg : 37 Top/Bottom Interval(mm): 1250/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 121.00 Rock Type: IGNEOUS
Core: 8 Sample Midpoint(m) : 122.25 Sect/Pc #: 1/PCE 13C
ROCK = APHYRIC BASALT;
Texture: INTERGRANULAR,TRACHYTOID,GLASSY*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): TO 0.3
MICROPHENOS,FRESH;
CLINOPYROXENE ( <1%)
Size(mm): TO 0.3
MICROPHENOS,FRESH*
Groundmass - OLIVINE
Size(mm): TO 0.03
PLAGIOCLASE
Size(mm): TO 0.03
PYROXENE
Size(mm): TO 0.03
MAGNETITE
GLASS
PART OF SLIDE HAS FRESH RESIDUAL GLASS,GOOD FOR
PROBE,VERY FRESH ROW ON THIS SIDE*
Vesicles -
Filling: CHLOROPH,SMEC
CHLOROPH NEXT TO WALL-THEN SMEC*
Leg : 37 Top/Bottom Interval(mm): 60/ 90 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 121.00 Rock Type: IGNEOUS
Core: 8 Sample Midpoint(m) : 122.58 Sect/Pc #: 2/PCE 15
ROCK = PLAG-CPX-OL SPARSELY PHYRIC BASALT
ONE GLOMEROPORPHYRITIC CLOT OF OL + AUGITE + PLAG;
Texture: INTERGRANULAR,INTERSERTAL*
Phenocrysts- OLIVINE ( <1%)
Size(mm): <0.6
ONE GRAIN(?),FRESH;
CLINOPYROXENE ( <1%)
Size(mm): <0.6
FRESH;
PLAGIOCLASE ( <1%)
Size(mm): <0.5
FRESH*
Groundmass - PLAGIOCLASE
Size(mm): 0.01-0.1
PYROXENE
Size(mm): 0.01-0.1
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Size(mm): 0.3-0.6
Percent: 1
Filling: SMEC,CARB
Leg : 37 Top/Bottom Interval(mm): 450/ 0 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 121.00 Rock Type: IGNEOUS
Core: 8 Sample Midpoint(m) : 122.95 Sect/Pc #: 2/PCE 19
ROCK = PLAG-CPX SPARSELY PHYRIC BASALT;
Texture: INTERGRANULAR,INTERSERTAL,GLASSY*
Phenocrysts- PLAGIOCLASE ( <1%)
PLAG OCCURS RARE AND SCATTERED THROUGHOUT,ANGLE OF
EXTINCTION IS 50 DEGREES,APPROX COMP AN85-90;
CLINOPYROXENE ( <1%)
AUGITE OCCURS IN A SMALL GLOMEROPORPHYRITIC CLUMP,
FRESH, 2VZ 45*
Groundmass - PYROXENE ( 40%)
Size(mm): 0.01-0.1
GLASS ( 38%)
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): 0.01-0.1
MAGNETITE ( 2%)
OLIVINE ( TR%)
Alteration - SMECTITE
Replacing: GROUNDMASS
Vesicles -
Size(mm): 0.4
Percent: 6
Filling: SMEC,CARB
VERY FEW VESICLES,SOME WITH CALCITE-SOME WITH
SMEC,SMEC NEXT TO WALL-THEN CHLOROPH*
Leg : 37 Top/Bottom Interval(mm): 750/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 121.00 Rock Type: IGNEOUS
Core: 8 Sample Midpoint(m) : 123.25 Sect/Pc #: 2/PCE 23
ROCK = APHYRIC BASALT;
Texture: INTERGRANULAR,GLASSY*
Phenocrysts- PLAGIOCLASE ( <1%)
MICROPHENOS,FRESH;
CLINOPYROXENE ( <1%)
MICROPHENOS,FRESH*
Groundmass - GLASS
SOME FRESH GLASS,OXIDIZED;
OLIVINE ( TR%)
REPLACED BY CARBONATE IF PRESENT;
PLAGIOCLASE
Size(mm): TO 0.04
PYROXENE
Size(mm): TO 0.04
MAGNETITE
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
MINOR SMEC;
CARBONATE
Location: GROUNDMASS Replacing: OLIVINE
Leg : 37 Top/Bottom Interval(mm): 920/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 121.00 Rock Type: IGNEOUS
Core: 8 Sample Midpoint(m) : 123.42 Sect/Pc #: 2/PCE 25
ROCK = APHYRIC BASALT;
Texture: INTERGRANULAR,APHYRIC*
Phenocrysts- PLAGIOCLASE ( <1%)
MICROPHENOS;
CLINOPYROXENE ( <1%)
MICROPHENOS*
Groundmass - OLIVINE
OL IN GROUNDMASS REPLACED BY CARBONATE IN PART;
GLASS
EXCELLENT GLASS FOR PROBE,ALSO FOUND IN THE
VESICLES;
PLAGIOCLASE
Size(mm): TO 0.03
PYROXENE
Size(mm): TO 0.03
MAGNETITE
Alteration - CARBONATE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Filling: SMEC,GLASS
Leg : 37 Top/Bottom Interval(mm): 1090/1120 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 121.00 Rock Type: IGNEOUS
Core: 8 Sample Midpoint(m) : 123.61 Sect/Pc #: 2/PCE 27
ROCK = APHYRIC BASALT;
Texture: INTERGRANULAR,APHYRIC;
Phenocrysts- PLAGIOCLASE ( <1%)
FRESH,MICROPHENOS;
CLINOPYROXENE ( TR%)
FRESH,MICROPHENOS*
Groundmass - OLIVINE
ID UNCERTAIN;
PLAGIOCLASE
Size(mm): 0.01-0.1
PYROXENE
Size(mm): 0.01-0.1
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Filling: SMEC,CARB
Leg : 37 Top/Bottom Interval(mm): 1290/1350 Describer: Robinson, P.
Hole: 332A Top of Core Depth(m) : 121.00 Rock Type: IGNEOUS
Core: 8 Sample Midpoint(m) : 123.82 Sect/Pc #: 2/PCE 30
ROCK = APHYRIC BASALT
FINE-GRAINED MIXTURE OF PLAG + CPX + OP.MINS +
BROWN GLASS(CHIEFLY DEVITRIFIED AND SOMETIMES
REPLACED BY SMEC);
Texture: INTERGRANULAR,INTERSERTAL,GLASSY,APHYRIC*
Groundmass - PLAGIOCLASE ( 40%)
PYROXENE ( 35%)
GLASS ( 20%)
ALTERED;
OPAQUE MINERALS ( 5%)
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
CHLOROPHAEITE ( TR%)
Location: INTERSTITIAL Replacing: GROUNDMASS
SMECTITE
Replacing: GLASS
Vesicles -
Filling: SMEC,CARB,ZEOL,
Filling: CHLOROPH
RIM OF DARK CARB(?) AND FILLING OF CLEAR CARB,
ZEOLITE IS BROWNISH ISOTROPIC-ANALCITE(?)*
Leg : 37 Top/Bottom Interval(mm): 60/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 130.50 Rock Type: IGNEOUS
Core: 9 Sample Midpoint(m) : 130.56 Sect/Pc #: 1/PCE 1
ROCK = PLAG-CPX SPARSELY PHYRIC BASALT;
Texture: INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): 0.2
CLINOPYROXENE ( <1%)
Size(mm): 0.2
Groundmass - PLAGIOCLASE
Size(mm): TO 0.03
PYROXENE
Size(mm): TO 0.03
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN;
GLASS
OXIDIZED,SOME GLASS GOOD FOR PROBE*
Vesicles -
Filling: SMEC,CARB
Leg : 37 Top/Bottom Interval(mm): 410/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 130.50 Rock Type: IGNEOUS
Core: 9 Sample Midpoint(m) : 130.91 Sect/Pc #: 1/PCE 5
ROCK = SPARSELY PHYRIC BASALT;
Texture: INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 0.2-0.8
MICROPHENOS,FRESH*
Groundmass - OLIVINE
SMALL AND RARE IN GROUNDMASS;
PLAGIOCLASE
Size(mm): TO 0.03
PYROXENE
Size(mm): TO 0.03
MAGNETITE
GLASS
FRESH,GOOD FOR PROBE*
Vesicles -
Percent: 0
OBSERVER INDICATES NO VESICLES OR ALTERATION*
Leg : 37 Top/Bottom Interval(mm): 500/ 0 Describer: Robinson, P.
Hole: 332A Top of Core Depth(m) : 130.50 Rock Type: IGNEOUS
Core: 9 Sample Midpoint(m) : 131.00 Sect/Pc #: 1/PCE 6
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: INTERGRANULAR,INTERSERTAL,
APHANITIC-CRYPTOCRYSTALLINE*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 0.2-0.5
MICROPHENOS,FRESH*
Groundmass - OLIVINE ( TR%)
PROBABLE OL IN GROUNDMASS BUT MOSTLY ALTERED TO
SMECTITE;
PLAGIOCLASE
PYROXENE
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN;
SMECTITE
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS,OL
PROBABLY GROUNDMASS OL MOSTLY ALTERED TO SMEC,SMEC
IN GROUNDMASS ONLY ALONG ONE SIDE OF SLIDE-SHARP
BOUNDARY*
Vesicles -
Size(mm): 0.5
Percent: 3-5
Filling: SMEC,ZEOLITE
SMEC NEXT TO WALL-THEN ZEOLITE,SLIDE ALTERED ONLY
ON ONE SIDE-SHARP BOUNDARY-AND VESICLES ARE FILLED
ONLY IN ALTERED PART*
Leg : 37 Top/Bottom Interval(mm): 670/ 0 Describer: Robinson, P.
Hole: 332A Top of Core Depth(m) : 130.50 Rock Type: IGNEOUS
Core: 9 Sample Midpoint(m) : 131.17 Sect/Pc #: 1/PCE 7
ROCK = PLAG SPARSELY PHYRIC BASALT
ALTERATION ON ONE SIDE AND ALONG NARROW FRACTURES;
Texture: INTERGRANULAR,INTERSERTAL,
APHANITIC-CRYPTOCRYSTALLINE*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 0.3-0.5
FRESH*
Groundmass - OLIVINE ( TR%)
Size(mm): 0.01-0.1
PLAGIOCLASE
Size(mm): 0.01-0.1
PYROXENE
Size(mm): 0.01-0.1
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN;
GLASS
FRESH AND ALTERED*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
ALTERATION ON ONE SIDE AND ALONG NARROW FRACTURES;
CARBONATE
Location: INTERSTITIAL Replacing: GROUNDMASS
ALTERATION ON ONE SIDE AND ALONG NARROW FRACTURES*
Vesicles -
Size(mm): 0.5
Percent: 3-5
Filling: SMEC,CARB,ZEOL,
Filling: CHLOROPHAEITE
ID UNCERTAIN FOR ZEOL,CHLOROPH NEXT TO WALL-THEN
SMEC,IN FRESH AREAS VESICLES HAVE MINOR CALCITE
AND EITHER ZEOLITE OR SILICA(CRISTOBALITE?)*
Leg : 37 Top/Bottom Interval(mm): 900/ 0 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 130.50 Rock Type: IGNEOUS
Core: 9 Sample Midpoint(m) : 131.40 Sect/Pc #: 1/PCE 10
ROCK = APHYRIC BASALT;
Texture: VARIOLITIC,GLASSY*
Groundmass - GLASS
ALTERED;
PLAGIOCLASE
Size(mm): 0.01-1.0
PYROXENE
Size(mm): 0.01-1.0
Alteration - SMECTITE
Replacing: GLASS
SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Size(mm): 1.0-2.0
Percent: 8
Filling: SMEC,CHLOROPH
SMEC NEXT TO WALL-THEN CHLOROPH*
Leg : 37 Top/Bottom Interval(mm): 1310/ 0 Describer: Robinson, P.
Hole: 332A Top of Core Depth(m) : 130.50 Rock Type: IGNEOUS
Core: 9 Sample Midpoint(m) : 131.81 Sect/Pc #: 1/PCE 16
ROCK = PLAG SPARSELY PHYRIC BASALT
ALTERATION AND VESICLE FILLING ONLY IN HALF OF
SLIDE WITH SHARP BOUNDARY;
Texture: INTERGRANULAR,INTERSERTAL,GLASSY*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 0.2-0.3
FRESH,NARROW ZONE ON MARGIN;
CLINOPYROXENE ( TR%)
Groundmass - PLAGIOCLASE
Size(mm): 0.01-0.1
PYROXENE
Size(mm): 0.01-0.1
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
ALTERATION ONLY IN ONE HALF OF SLIDE WITH SHARP
BOUNDARY*
Vesicles -
Size(mm): 0.7
Percent: 3-5
Filling: SMEC,CARB
SMEC NEXT TO WALL-THEN CARB,VESICLE FILLING ONLY
IN HALF OF SLIDE WITH SHARP BOUNDARY*
Leg : 37 Top/Bottom Interval(mm): 560/ 670 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 140.00 Rock Type: IGNEOUS
Core: 10 Sample Midpoint(m) : 145.12 Sect/Pc #: CC/
ROCK = PLAG-CPX MODERATELY PHYRIC BASALT;
Texture: INTERGRANULAR,TRACHYTOID,INTERSERTAL
TRACHYTOID IS CRUDE*
Phenocrysts- PLAGIOCLASE ( 1-5%)
FRESH;
CLINOPYROXENE ( <1%)
FRESH*
Groundmass - GLASS ( 5%)
FRESH;
GLASS ( 20%)
ALTERED;
PLAGIOCLASE ( 30%)
PYROXENE ( 43%)
MAGNETITE ( 2%)
Alteration - SMECTITE
Replacing: GROUNDMASS
MOST SMEC OCCURS IN BANDS-FILLING BOTH VESICLES
AND INTERSTICES;
SMECTITE
Location: VEIN
Vesicles -
Filling: SMEC,CARB
MOST SMEC OCCURS IN BANDS-FILLING BOTH VESICLES
AND INTERSTICES*
Leg : 37 Top/Bottom Interval(mm): 750/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 140.00 Rock Type: IGNEOUS
Core: 10 Sample Midpoint(m) : 145.25 Sect/Pc #: CC/PCE 4
ROCK = PLAG-CPX MODERATELY PHYRIC BASALT;
Texture: INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): TO 0.3
SIZE IS ALSO 1X1;
CLINOPYROXENE ( <1%)
Size(mm): TO 0.3
Groundmass - PLAGIOCLASE
Size(mm): TO 0.05
PYROXENE
Size(mm): TO 0.05
MAGNETITE
GLASS
GOOD RESIDUAL GLASS(SEPARATED IMMEDIATELY?) FOR
PROBE*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Leg : 37 Top/Bottom Interval(mm): 780/ 810 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 140.00 Rock Type: IGNEOUS
Core: 10 Sample Midpoint(m) : 145.30 Sect/Pc #: CC/PCE 5
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: INTERGRANULAR,INTERSERTAL,GLASSY*
Phenocrysts- PLAGIOCLASE ( 1-5%)
FRESH*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): 0.01-0.1
APPROX COMP AN50;
PYROXENE ( 45%)
Size(mm): 0.01-0.1
SEVERAL AREAS IN WHICH PYX AND PLAG APPEAR TO
RADIATE FROM A GRANULAR ILL-DEFINABLE CENTER-
SUGGESTIVE OF INITIAL VARIOLITIC GROWTH(?);
GLASS ( 15%)
MANY INTERSTITIAL PATCHES OF FINE-GRAINED
ALTERATION APPEAR TO HAVE BEEN FROM GLASS,SOME OF
THE PATCHES HAVE SEMI-CIRCULAR STRIATIONS WHICH IS
STRONGLY SUGGESTIVE OF SPHERULITIC DEVITRIFICATION
OF GLASS;
MAGNETITE ( 3%)
Morphology: SKELETAL
HIGHLY SKELETAL AND CONFINED TO INTERSTITIAL
PATCHES OF FINE-GRAINED ALTERATION*
Alteration - CHLOROPHAEITE
Replacing: GLASS
ALL CHLOROPH NOW TOTALLY ALTERED TO SMECTITES;
SMECTITE
Replacing: GLASS,CHLOROPH
CARBONATE ( TR%)
Replacing: GROUNDMASS
OTHER
Replacing: GLASS
FINE-GRAINED REPLACEMENT OF GLASS*
Vesicles -
Size(mm): 0.3
Percent: 5
Leg : 37 Top/Bottom Interval(mm): 530/ 600 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 149.50 Rock Type: IGNEOUS
Core: 11 Sample Midpoint(m) : 150.07 Sect/Pc #: 1/PCE 1
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: VARIOLITIC,INTERGRANULAR,TRACHYTOID
ONLY FAINTLY TRACHYTOID*
Phenocrysts- PLAGIOCLASE ( <1%)
APPROX COMP AT LEAST AN65;
OLIVINE ( <1%)
FRESH,FOUND ONE HIGHLY RESORBED OL REMNANT*
Groundmass - PYROXENE ( 50%)
PLAGIOCLASE ( 20%)
MAGNETITE ( 2%)
Morphology: SKELETAL
OLIVINE ( TR%)
Alteration - CHLOROPHAEITE
Replacing: GROUNDMASS
SMECTITE
Location: LINE VESICLES Replacing: GROUNDMASS
AT LEAST THREE GENERATIONS OF SMEC-ONE ORANGE IN
THIN RINDS ON SOME VESICLES-ONE YELLOW OR GREENISH
YELLOW IN THICK RINDS OVER THE FIRST OR COMPLETELY
FILLING THE VESICLES,A THIRD ORANGE ONE APPEARS
EITHER LATER OR IN THE MIDDLE OF THE FIRST AND
ALSO FORMS THIN LAYERS*
Vesicles -
Size(mm): 0.15
Percent: 3
Filling: SMEC,CARB
A FEW OF THE VESICLES HAVE A HALF LINING-
CONSISTENTLY TO THE SAME SIDE-GEOPETAL OF
VARIOLITIC MATERIAL,AT LEAST THREE GENERATIONS OF
SMECTITE ALTERATION LINING OR COMPLETELY FILLING
THE VESICLES*
Leg : 37 Top/Bottom Interval(mm): 800/ 890 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 149.50 Rock Type: IGNEOUS
Core: 11 Sample Midpoint(m) : 150.35 Sect/Pc #: 1/PCE 4
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Groundmass - PYROXENE ( 55%)
Size(mm): 0.1-1.0
PLAGIOCLASE ( 35%)
Size(mm): 0.1-1.0
MAGNETITE ( 2%)
Morphology: SKELETAL
MAGN IS LARGER THAN IN MANY OF THE OTHER ROCKS
ALTHOUGH STILL CONFINED TO THE GLASS-AND STILL
SKELETAL;
GLASS ( 8%)
ALTERED*
Alteration - CHLOROPHAEITE
Replacing: GROUNDMASS
SMECTITE
Replacing: GLASS
CHLOROPHAEITE
Replacing: GLASS
SMECTITE
Location: VEINS
Vesicles -
Size(mm): 0.4
Percent: 5
Filling: SMEC
MANY OF THE VESICLES ARE QUITE CLEAR,FILLED OR
PARTIALLY FILLED VESICLES OCCUR IN ZONES,FILLED
WITH YELLOW-GREEN SMEC WITH EXCELLENT RADIAL
STRUCTURE-PSEUDO-UNIAXIAL UNDER CROSSED NICOLS*
Leg : 37 Top/Bottom Interval(mm): 1080/1150 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 149.50 Rock Type: IGNEOUS
Core: 11 Sample Midpoint(m) : 150.62 Sect/Pc #: 1/PCE 7
ROCK = PLAG-CPX SPARSELY PHYRIC BASALT;
Texture: INTERGRANULAR
TEX IS A LITTLE FINER-GRAINED THAN USUAL,MANY
SMALL VARIOLITIC PATCHES BUT OVER ALL TEX APPEARS
INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( <1%)
MICROPHENOS,FRESH;
CLINOPYROXENE ( <1%)
MICROPHENOS,FRESH*
Groundmass - PYROXENE ( 53%)
Size(mm): 0.01-0.1
PLAGIOCLASE ( 30%)
Size(mm): 0.01-0.1
GLASS ( 15%)
ALTERED;
MAGNETITE ( 2%)
Vesicles -
Size(mm): 0.2
Percent: 5
Filling: SMEC,CARB
MOST VESICLES EMPTY OR WITH SMALL BUTTONS OF
RADIAL FIBROUS CALCITE,FILLED VESICLES WITH SMEC
OCCUR IN A BAND 1.8MM WIDE CONTINUOUS ACROSS THE
SLIDE AND IN OTHER DISTRIBUTARY BANDS WHICH ARE
NARROWER,DISTINCTIVE COLORED BANDS IN THE THIN
SECTION ONLY VISIBLE MEGASCOPICALLY*
Leg : 37 Top/Bottom Interval(mm): 60/ 110 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 159.00 Rock Type: IGNEOUS
Core: 12 Sample Midpoint(m) : 159.09 Sect/Pc #: 1/PCE 1
ROCK = PLAG SPARSELY PHYRIC BASALT
VERY FINE-GRAINED ROCK WITH PATCHES THAT ARE
PRACTICALLY CRYPTOCRYSTALLINE;
Texture: VARIOLITIC
CRUDE,LOOKS LIKE A VARIOLITIC TEX STARTED THEN WAS
BLOCKED IN BY NORMAL BUT VERY FINE-GRAINED
CRYSTALLIZATION*
Phenocrysts- PLAGIOCLASE ( <1%)
FRESH,MICROPHENOS*
Groundmass - PLAGIOCLASE
PYROXENE
GLASS
ALTERED*
Alteration - DEVITRIFIED GLASS
Replacing: GLASS
FINE-GRAINED DEVITRIFICATION;
CHLOROPHAEITE
Replacing: GROUNDMASS
Vesicles -
Percent: 5
Filling: SMEC,CARB
SMEC NEXT TO WALL-THEN CARB*
Leg : 37 Top/Bottom Interval(mm): 570/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 159.00 Rock Type: IGNEOUS
Core: 12 Sample Midpoint(m) : 159.57 Sect/Pc #: 1/PCE 6
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: INTERGRANULAR,TRACHYTOID,GLASSY;
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): TO 0.2
FRESH,MICROPHENOS*
Groundmass - PLAGIOCLASE
Size(mm): TO 0.04
PYROXENE
Size(mm): TO 0.04
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN;
GLASS
ALTERED;
OLIVINE
ID UNCERTAIN,MINERAL WITH HIGH BIREFRINGENCE IS
PROBABLY NOT OL BASED ON EXTINCTION + SURFACE TEX*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
OTHER
Replacing: GLASS
OXIDATION-DEVITRIFICATION*
Vesicles -
Size(mm): 0.2-0.4
Percent: 5
Filling: SMEC
Leg : 37 Top/Bottom Interval(mm): 890/ 0 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 159.00 Rock Type: IGNEOUS
Core: 12 Sample Midpoint(m) : 159.89 Sect/Pc #: 1/PCE 10
ROCK = APHYRIC BASALT;
Texture: SUBOPHITIC,INTERGRANULAR*
Groundmass - PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Size(mm): 0.5
Percent: <5
Filling: SMEC
Leg : 37 Top/Bottom Interval(mm): 1070/1100 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 159.00 Rock Type: IGNEOUS
Core: 12 Sample Midpoint(m) : 160.09 Sect/Pc #: 1/
ROCK = APHYRIC BASALT;
Texture: INTERGRANULAR,INTERSERTAL*
Groundmass - PLAGIOCLASE
PYROXENE
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN,MAGN OCCURS WITH SULFIDE;
SULFIDES
SULFIDES(WITH SOME EXSOLUTION) OCCUR WITH MAGN AND
AS SMALL XTLS IN SOME VESICLES*
Alteration - SMECTITE
Replacing: GROUNDMASS
CHLOROPHAEITE
Replacing: GLASS
ID UNCERTAIN,NOW TOTALLY ALTERED TO SMEC;
SMECTITE
Replacing: GLASS
INTERSERTAL GLASS NOW TOTALLY ALTERED TO
CHLOROPH(?) FIRST-THEN THAT IS TOTALLY ALTERED TO
SMECTITE*
Vesicles -
Size(mm): 1.0
Percent: 3
Filling: SMEC,CARB,ZEOL,
Filling: SULFIDE
SULFIDE OCCURS AS SMALL XTLS IN SOME VESICLES*
Leg : 37 Top/Bottom Interval(mm): 200/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 159.00 Rock Type: IGNEOUS
Core: 12 Sample Midpoint(m) : 160.70 Sect/Pc #: 2/PCE 12F
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): TO 0.3
PLAGIOCLASE ( <1%)
Size(mm): TO 0.3
FRESH*
FRESH*
Groundmass - OLIVINE
Size(mm): TO 0.08
PSEUDOMORPHED BY SERP AND CARB;
PLAGIOCLASE
Size(mm): TO 0.08
PYROXENE
Size(mm): TO 0.08
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN;
GLASS
FRESH,DEVITRIFIED*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Size(mm): 0.4
Percent: 3
Filling: SMEC
Leg : 37 Top/Bottom Interval(mm): 840/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 159.00 Rock Type: IGNEOUS
Core: 12 Sample Midpoint(m) : 161.34 Sect/Pc #: 2/
ROCK = PLAG SPARSELY PHYRIC BASALT
Texture: SUBOPHITIC,INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( <1%)
FRESH,MICROPHENOS*
Groundmass - PLAGIOCLASE
Size(mm): TO 0.06
PYROXENE
Size(mm): TO 0.06
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN;
OLIVINE
ID UNCERTAIN,ONE GRAIN OF IDDINGSITE*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
IDDINGSITE
Replacing: OL
Vesicles -
Size(mm): 0.3
Percent: 2
Filling: SMEC
Leg : 37 Top/Bottom Interval(mm): 1140/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 168.50 Rock Type: IGNEOUS
Core: 13 Sample Midpoint(m) : 169.64 Sect/Pc #: 1/PCE 1
ROCK = APHYRIC BASALT
FRESH ROCK;
Texture: INTERGRANULAR,APHANITIC-CRYPTOCRYSTALLINE*
Phenocrysts- CLINOPYROXENE ( <1%)
FRESH,MICROPHENOS,ONE VERY LARGE XTL*
Groundmass - GLASS
FRESH ROCK,INTERSTITIAL MATERIAL(PROBABLY
ORIGINALLY GLASS) IS OXIDIZED*
Vesicles -
Size(mm): TO 2.0
Percent: 5-7
Filling: GLASS
MOST VESICLES ARE <0.3-BUT CAN BE UP TO 2.0MM*
Leg : 37 Top/Bottom Interval(mm): 1440/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 168.50 Rock Type: IGNEOUS
Core: 13 Sample Midpoint(m) : 169.94 Sect/Pc #: 1/PCE 5
ROCK = APHYRIC BASALT;
Texture: INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( <1%)
FRESH,MICROPHENOS,A FEW SMALL XTLS*
Groundmass - OLIVINE
SOME FRESH;
PLAGIOCLASE
Size(mm): TO 0.03
PYROXENE
Size(mm): TO 0.03
MAGNETITE
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
CHLOROPHAEITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Size(mm): TO 0.4
Percent: 3
Filling: SMEC,CARB
Leg : 37 Top/Bottom Interval(mm): 1020/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 178.00 Rock Type: IGNEOUS
Core: 14 Sample Midpoint(m) : 179.02 Sect/Pc #: 1/PCE 9
ROCK = APHYRIC BASALT;
Texture: INTERGRANULAR*
Groundmass - OLIVINE
SMECTITE ALTERATION;
PLAGIOCLASE
Size(mm): TO 0.03
PYROXENE
Size(mm): TO 0.03
MAGNETITE
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: OLIVINE
SMEC REPLACES ONLY GROUNDMASS OL*
Vesicles -
Filling: SMEC,CHLOROPH
CHLOROPH BEGINNING TO CRYSTALLIZE*
Leg : 37 Top/Bottom Interval(mm): 1160/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 178.00 Rock Type: IGNEOUS
Core: 14 Sample Midpoint(m) : 179.16 Sect/Pc #: 1/PCE 11
ROCK = APHYRIC BASALT;
Texture: INTERGRANULAR*
Groundmass - OLIVINE
Size(mm): TO 0.05
FRESH OLIVINE IN GROUNDMASS;
GLASS
SOME GOOD GLASS FOR PROBE;
PLAGIOCLASE
Size(mm): TO 0.05
PYROXENE
Size(mm): TO 0.05
MAGNETITE
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Filling: SMEC
Leg : 37 Top/Bottom Interval(mm): 1220/1260 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 178.00 Rock Type: IGNEOUS
Core: 14 Sample Midpoint(m) : 179.24 Sect/Pc #: 1/PCE 12
ROCK = PLAG-CPX SPARSELY PHYRIC BASALT;
Texture: VARIOLITIC,INTERGRANULAR,INTERSERTAL
VARIOLITIC IN PLACES-NOT IMPORTANT;
Phenocrysts- PLAGIOCLASE ( <1%)
FRESH,MICROPHENOS,PHENOS OCCUR IN PROTO-
"GLOMEROPORPHS" OF PLAG + CPX-NO OL SEEN;
CLINOPYROXENE ( <1%)
FRESH,MICROPHENOS-IN PROTOGLOMEROPORPHS WITH PLAG;
OLIVINE ( 0%)
NO OL PRESENT*
Groundmass - PLAGIOCLASE
Size(mm): 0.01-0.1
PYROXENE
Size(mm): 0.01-0.1
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Replacing: GLASS
SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Size(mm): TO 1.0
Percent: 1
Filling: SMEC
INTERSTITIAL WITH VESICULAR SMEC-IS PROBABLY AN
ALTERATION PRODUCT OF CHLOROPH*
Leg : 37 Top/Bottom Interval(mm): 1220/1300 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 178.00 Rock Type: IGNEOUS
Core: 14 Sample Midpoint(m) : 179.26 Sect/Pc #: 1/PCE 12
ROCK = PLAG-CPX SPARSELY PHYRIC BASALT;
Texture: INTERGRANULAR,INTERSERTAL;
Phenocrysts- PLAGIOCLASE ( <1%)
ALL MICROPHENOS OCCUR IN ONE GLOMEROPORPHYRITIC
CLUMP,PLAG IS ZONED ON OUTER MARGIN EVEN AGAINST
PYX XTLS WITHIN THE CLUMP,FRESH;
CLINOPYROXENE ( <1%)
ALL MICROPHENOS OCCUR IN ONE GLOMEROPORPHYRITIC
CLUMP,FRESH*
Groundmass - PLAGIOCLASE ( 30%)
GLASS ( 25%)
ALTERED;
MAGNETITE ( 3%)
Morphology: SKELETAL
CONFINED TO GLASSY AREAS,IT DOES NOT OCCUR IN
AREAS REPLACED BY SMECTITE-SUGGESTS THAT SMECTITE
IS REPLACING SOMETHING DIFFERENT FROM THE NORMAL
GLASS*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
SMECTITES ARE IN TWO BANDS-ONE REDDISH FROM
OXIDATION AND ONE YELLOW-GREEN,YELLOW-GREEN BAND
HAS DARK ALTERED GLASS AND MAGN SO APPEARS LIGHTER
COLORED OVERALL,SMEC LININGS OF VESICLES ALSO
RESTRICTED TO THESE ZONES*
Vesicles -
Percent: 3
Filling: SMEC
Leg : 37 Top/Bottom Interval(mm): 1/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 187.50 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 189.00 Sect/Pc #: CC/PCE 1 OR
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT;
LABELED 5);
Texture: INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): 0.1-0.5
CLINOPYROXENE ( 1-5%)
Size(mm): 0.1-0.5
OLIVINE ( <1%)
Size(mm): 0.1-0.5
Groundmass - OLIVINE
Size(mm): TO 0.04
FRESH;
PLAGIOCLASE
Size(mm): TO 0.04
PYROXENE
Size(mm): TO 0.04
MAGNETITE
GLASS
EXCELLENT FRESH LIGHT BROWN GLASS FOR PROBE*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Filling: SMEC
Leg : 37 Top/Bottom Interval(mm): 2/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 187.50 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 189.00 Sect/Pc #: CC/PCE 1 OR
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT
SLIDE IS LABELED 14CM FOR INTERVAL;
(PROBABLY PCE 4);
Texture: INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): 0.2-0.5
ONE PLAG CLOT IS 1MM;
CLINOPYROXENE ( 1-5%)
Size(mm): 0.2-0.5
OLIVINE ( <1%)
Groundmass - OLIVINE
Size(mm): TO 0.03
CHLOROPH REPLACING GROUNDMASS OL(?),ALSO FRESH OL;
PLAGIOCLASE
Size(mm): TO 0.03
PYROXENE
Size(mm): TO 0.03
MAGNETITE
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
CHLOROPHAEITE
Location: INTERSTITIAL Replacing: OLIVINE
Vesicles -
Filling: SMEC
Leg : 37 Top/Bottom Interval(mm): 630/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 187.50 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 189.63 Sect/Pc #: CC/PCE 2
ROCK = PLAG-CPX SPARSELY PHYRIC BASALT;
Texture: INTERGRANULAR,GLASSY,APHANITIC-CRYPTXLN*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): 0.1-0.5
AUGITE-PLAG MICROPORPHYRITIC CLOTS;
CLINOPYROXENE ( 1-5%)
Size(mm): 0.1-0.5
AUGITE-PLAG MICROPORPHYRITIC CLOTS*
Groundmass - GLASS
ALTERED*
Alteration - SMECTITE
Replacing: GLASS
OTHER
Replacing: GLASS
DEVITRIFIED*
Leg : 37 Top/Bottom Interval(mm): 710/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 187.50 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 189.71 Sect/Pc #: CC/PCE 3
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT;
Texture: APHANITIC-CRYPTOCRYSTALLINE*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): 0.2-0.5
CLINOPYROXENE ( 1-5%)
Size(mm): 0.2-0.5
MISIDENTIFIED AS OLIVINE IN CORE (OR ELSE THIN
SECTION IS MISLABELED);
OLIVINE ( <1%)
ONE LARGE XTL*
Groundmass - OLIVINE
ID UNCERTAIN,ALL ALTERED,IDDINGS-SMECTITE FORMS IN
THE GROUNDMASS SUGGESTIVE OF OLIVINE*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Size(mm): <0.3
Percent: 5-7
Filling: SMEC
Leg : 37 Top/Bottom Interval(mm): 330/ 360 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 197.00 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 197.35 Sect/Pc #: 1/PCE 1
ROCK = APHYRIC BASALT
VERY FRESH ROCK;
Texture: INTERGRANULAR;
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 0.2-0.3 Morphology: SUBHEDRAL
ONE PLAG MICROPHENO,FRESH;
CLINOPYROXENE ( <1%)
Size(mm): TO 0.3 Morphology: SUBHEDRAL
ONE AUGITE MICROPHENO,FRESH*
Groundmass - PLAGIOCLASE
Size(mm): TO 0.02
PYROXENE
Size(mm): TO 0.02
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN,POORLY FORMED*
Alteration - CARBONATE ( TR%)
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Size(mm): 0.1-0.2
Percent: 5
Filling: CARB
Leg : 37 Top/Bottom Interval(mm): 430/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 206.50 Rock Type: IGNEOUS
Core: 17 Sample Midpoint(m) : 206.93 Sect/Pc #: 1/PCE 5
ROCK = APHYRIC BASALT
DARK GRAY FINE-GRAINED BASALT WITH BROWN STAINED
SURFACES;
Texture: INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( <1%)
ONE MICROPHENO IS 0.4MM*
Groundmass - PLAGIOCLASE
Size(mm): TO 0.05
PYROXENE
Size(mm): TO 0.05
MAGNETITE
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
OTHER
Replacing: GLASS
DEVITRIFIED*
Vesicles -
Size(mm): TO 0.8
Percent: 3
Filling: GLASS
GLASS FILLING IS RARE*
Leg : 37 Top/Bottom Interval(mm): 720/ 0 Describer: Robinson, P.
Hole: 332A Top of Core Depth(m) : 206.50 Rock Type: IGNEOUS
Core: 17 Sample Midpoint(m) : 207.22 Sect/Pc #: 1/PCE 9
ROCK = APHYRIC BASALT;
Texture: INTERGRANULAR,INTERSERTAL,GLASSY*
Groundmass - PLAGIOCLASE ( 50%)
PYROXENE ( 40%)
APPROX COMP AUGITE;
OPAQUE MINERALS ( 5%)
INCLUDES ILMENITE + MAGN;
GLASS ( 5%)
ALTERED,DEVITRIFIED,BROWN*
Alteration - SILICA
Replacing: GLASS
ID UNCERTAIN;
SILICA
Location: INTERSTITIAL Replacing: GROUNDMASS
ID UNCERTAIN*
Vesicles -
Size(mm): 0.5
Percent: <1
Filling: SILICA,GLASS
ID FOR SILICA UNCERTAIN,BROWN GLASSY(?)
MATERIAL WITH ABUNDANT ILMENITE ALSO PRESENT*
Leg : 37 Top/Bottom Interval(mm): 350/ 400 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 225.50 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 225.88 Sect/Pc #: 1/PCE 1
ROCK = APHYRIC BASALT;
Texture: PILOTAXITIC,TRACHYTOID,GLASSY
TRACHYTOID IS FAINT,TEXTURE IS VARIABLE ACROSS
THE SLIDE,ONE SIDE IS VERY FINE-GRAINED WITHOUT
ORIENTED MEMBERS,SHARP HIGHLY IRREGULAR CONTACT
WITH COARSER-GRAINED MATERIAL*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): TO 0.6
FRESH,MICROPHENOS*
Groundmass - PYROXENE ( 63%)
Size(mm): 0.02-0.03
GLASS ( 20%)
ALTERED;
PLAGIOCLASE ( 15%)
Size(mm): 0.02-0.03
MAGNETITE ( 2%)
Alteration - SMECTITE
Replacing: GLASS
CHLOROPHAEITE
Replacing: GLASS
ID UNCERTAIN;
SMECTITE
Location: VEIN
VEIN IS ONLY IN FINER GRAINED MATERIAL*
Vesicles -
Size(mm): 0.01
Percent: 5
Filling: SMEC,FE.OXIDE
SMEC NEXT TO WALL-THEN FE.OXIDE*
Leg : 37 Top/Bottom Interval(mm): 560/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 225.50 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 226.06 Sect/Pc #: 1/PCE 3
ROCK = APHYRIC BASALT
QUENCHED APHYRIC GLASS,SOME ZONES OF GROUNDMASS
CRYSTALLIZATION ASSOCIATED WITH VESICLES AT
INCIPIENT FRACTURES;
Texture: APHANITIC-CRYPTOCRYSTALLINE*
Phenocrysts- PLAGIOCLASE
A FEW TINY PLAG MICROPHENOS*
Groundmass - GLASS
DEVITRIFIED*
Alteration - SMECTITE
Replacing: GLASS
OTHER
Replacing: GLASS
DEVITRIFIED;
SMECTITE
Location: VEINS
ALTERATION ALONG VEINLETS*
Vesicles -
Filling: CHLOROPH
CHLOROPH IS DEEP ORANGE,VESICLES AT INCIPIENT
FRACTURES ASSOCIATED WITH SOME ZONES OF GROUNDMASS
CRYSTALLIZATION*
Leg : 37 Top/Bottom Interval(mm): 680/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 225.50 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 226.18 Sect/Pc #: 1/PCE 11
ROCK = APHYRIC BASALT;
Texture: INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): TO 0.3
FRESH,MICROPHENOS*
Groundmass - OLIVINE
Size(mm): 0.01-0.03
ID UNCERTAIN,RARE;
PLAGIOCLASE
Size(mm): 0.01-0.03
PYROXENE
Size(mm): 0.01-0.03
MAGNETITE
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Filling: SMEC,CARB
Leg : 37 Top/Bottom Interval(mm): 870/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 225.50 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 226.37 Sect/Pc #: 1/PCE 6
ROCK = APHYRIC BASALT;
Texture: INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): TO 0.2
FRESH,MICROPHENOS*
Groundmass - OLIVINE
Size(mm): TO 0.02
OL IN GROUNDMASS IS DOUBTFUL;
PLAGIOCLASE
Size(mm): TO 0.02
PYROXENE
Size(mm): TO 0.02
MAGNETITE
Alteration - SILICA ( TR%)
Replacing: GLASS
Vesicles -
Filling: SMEC,CARB,
Filling: SILICA
SMEC NEXT TO WALL-THEN SILICA-THEN CARB IN CENTER*
Leg : 37 Top/Bottom Interval(mm): 910/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 235.00 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 237.41 Sect/Pc #: 2/PCE 5
ROCK = APHYRIC BASALT;
Texture: APHANITIC-CRYPTOCRYSTALLINE
SOME ZONES OF CRYSTALLINE GROUNDMASS RELATED TO
VESICLES AND FRACTURES*
Vesicles -
Percent: TR
OBSERVER SAYS NOTHING ABOUT VESICLES EXCEPT THAT
SOME ZONES OF CRYSTALLINE GROUNDMASS RELATED TO
VESICLES AND FRACTURES*
Leg : 37 Top/Bottom Interval(mm): 1120/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 235.00 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 237.62 Sect/Pc #: 2/PCE 7
ROCK = APHYRIC BASALT;
Texture: APHANITIC-CRYPTOCRYSTALLINE
SOME ZONES OF MORE COARSELY CRYSTALLIZED
GROUNDMASS(TO 0.05MM)*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): TO 0.3
FRESH,MICROPHENOS*
Groundmass - PLAGIOCLASE
Size(mm): 0.01
PYROXENE
Size(mm): 0.01
MAGNETITE
Size(mm): 0.01
Alteration - SILICA
Replacing: GLASS
Vesicles -
Filling: SILICA
Leg : 37 Top/Bottom Interval(mm): 570/ 600 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 244.50 Rock Type: IGNEOUS
Core: 21 Sample Midpoint(m) : 245.09 Sect/Pc #: 1/PCE 4
ROCK = APHYRIC BASALT
DARK GRAY VERY FINE-GRAINED BASALT;
Texture: INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): TO 0.3
FRESH,MICROPHENOS;
AUGITE ( <1%)
Size(mm): TO 0.3
FRESH,MICROPHENOS*
Groundmass - OLIVINE
ID UNCERTAIN;
PLAGIOCLASE
Size(mm): 0.02
PYROXENE
Size(mm): 0.02
MAGNETITE
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Filling: SMEC,CARB
Leg : 37 Top/Bottom Interval(mm): 590/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 244.50 Rock Type: IGNEOUS
Core: 21 Sample Midpoint(m) : 245.09 Sect/Pc #: 1/PCE 4
ROCK = APHYRIC BASALT
DARK GREY VERY FINE-GRAINED BASALT;
Texture: INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): TO 0.3
FRESH,MICROPHENOS;
CLINOPYROXENE ( <1%)
Size(mm): TO 0.3
FRESH,MICROPHENOS*
Groundmass - PLAGIOCLASE
Size(mm): 0.03
PYROXENE
Size(mm): 0.03
MAGNETITE
Vesicles -
Filling: SMEC,CARB,ZEOL,
Filling: SILICA,FE.OXIDE
SMEC + SILICA NEXT TO WALL-THEN CARB-THEN SMEC-
THEN FE.OXIDE,ID OF ZEOLITE UNCERTAIN*
Leg : 37 Top/Bottom Interval(mm): 70/ 120 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 254.00 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 254.10 Sect/Pc #: 1/PCE 1
ROCK = APHYRIC BASALT
DARK GRAY VERY FINE-GRAINED BASALT,BOUNDARY IN
SLIDE BETWEEN MORE AND LESS ALTERED CORE;
Texture: INTERGRANULAR,APANITIC-CRYPTOCRYSTALLINE*
Phenocrysts- PLAGIOCLASE ( <1%)
FRESH,PYX-PLAG CLOT TO 1.0MM;
CLINOPYROXENE ( <1%)
FRESH,PYX-PLAG CLOT TO 1.0MM*
Groundmass - PLAGIOCLASE
Size(mm): 0.01-0.1
PYROXENE
Size(mm): 0.01-0.1
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN;
GLASS
ALTERED,OXIDIZED*
Vesicles -
Filling: SMEC,CARB
Leg : 37 Top/Bottom Interval(mm): 1360/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 254.00 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 255.36 Sect/Pc #: 1/PCE 16
ROCK = APHYRIC BASALT
DARK GRAY VERY FINE-GRAINED BASALT;
Texture: INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( <1%)
ONE CLOT*
Groundmass - OLIVINE
Size(mm): 0.04
PLAGIOCLASE
Size(mm): 0.04
PYROXENE
Size(mm): 0.04
MAGNETITE
Alteration - OTHER
Replacing: GLASS
DEVITRIFIED AND OXIDIZED WITH XTLS OF FE.TI.OX;
FE-TI OXIDE
XTLS IN GLASS*
Vesicles -
Filling: SMEC,CARB,
Filling: SILICA,GLASS
SMEC NEXT TO WALL-THEN SILICA-THEN CARB*
Leg : 37 Top/Bottom Interval(mm): 370/ 410 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 263.50 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 263.89 Sect/Pc #: 1/PCE 5
ROCK = APHYRIC BASALT
DARK GRAY FINE-GRAINED BASALT;
Texture: INTERGRANULAR,TRACHYTOID
CONTACT BETWEEN MORE AND LESS TRACHYTOID
GROUNDMASS*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): <0.2
FRESH,MICROPHENOS*
Groundmass - OLIVINE
ID UNCERTAIN-SUGGESTION OF CARB REPLACING RARE
GROUNDMASS OLIVINE;
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN;
PLAGIOCLASE
Size(mm): 0.02
PYROXENE
Size(mm): 0.02
Alteration - CARBONATE
Replacing: GROUNDMASS
SUGGESTION OF CARB REPLACING RARE GROUNDMASS OL?;
OTHER
Replacing: GLASS
DEVITRIFICATION AND OXIDATION;
SMECTITE
Replacing: GLASS
Vesicles -
Size(mm): TO 0.4
Percent: 5
Filling: SMEC,SILICA,
Filling: CHLOROPH
SMEC NEXT TO WALL-THEN CHLOROPH,CHLOROPH ONLY IN
SOME VESICLES,MOST ARE 0.08MM IN SIZE*
Leg : 37 Top/Bottom Interval(mm): 400/ 0 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 263.50 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 263.90 Sect/Pc #: 1/PCE 5
ROCK = APHYRIC BASALT
DARK GRAY FINE-GRAINED BASALT,OBSERVER IS
UNCERTAIN OF THE INTERVAL THIS SECTION IS FROM-IT
IS PROBABLY MISLABELED;
Texture: INTERGRANULAR,INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( <1%)
FRESH,MICROPHENOS*
Groundmass - PYROXENE ( 35%)
Size(mm): 0.01-0.1
PRONOUNCED SECTOR ZONING IN THE PYROXENE;
GLASS ( 27%)
ALTERED;
PLAGIOCLASE ( 25%)
Size(mm): 0.01-0.1
GLASS ( 10%)
FRESH;
MAGNETITE ( 3%)
Morphology: SKELETAL
SULFIDES ( 0.5%)
OCCUR IN ROUND DROPLETS WITHIN THE BASALTIC GLASS,
SUSPECT SULFIDE IMMISCIBILITY,DROPLETS ARE TWO
MICROMETERS AND LESS IN DIAMETER*
Alteration - CHLOROPHAEITE
Replacing: GLASS
CHLOROPH OCCURS IN DROPLETS TO 30 MICROMETERS AND
IN INTERSTITIAL PATCHES TO 0.1MM ACROSS,ALL NOW
ALTERED TO SMEC,DROPLET OCCURRENCE IN BASALTIC
GLASS IS INDICATION OF IMMISCIBILITY*
Vesicles -
Filling: SMEC,CARB
SMEC NEXT TO WALL-THEN CARB-THEN SMEC AGAIN*
Leg : 37 Top/Bottom Interval(mm): 360/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 282.50 Rock Type: IGNEOUS
Core: 25 Sample Midpoint(m) : 282.86 Sect/Pc #: 1/PCE 2
ROCK = PLAG-OL-CPX MODERATELY PHYRIC BASALT
THREE PHENOS,OL COMMON IN GROUNDMASS;
Texture: INTERGRANULAR,TRACHYTOID*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): 0.2-0.8
SHARP MARGINAL ZONE,FRESH,IN CLOTS 1.5MM ACROSS;
CLINOPYROXENE ( <1%)
Size(mm): 0.2-0.8
TWINNED,2VZ 45,FRESH,CLOTS 1.5MM ACROSS;
OLIVINE ( <1%)
Size(mm): 0.2-0.8
FRESH AND ALTERED-SOME SERPENTINE RIMS,IN CLOTS TO
1.5MM ACROSS*
Groundmass - OLIVINE ( 1%)
Size(mm): 0.02
PLAGIOCLASE
Size(mm): 0.02
PYROXENE
Size(mm): 0.02
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: OLIVINE
Vesicles -
Size(mm): 0.2
Percent: 5
Filling: SMEC,HEMATITE,
Filling: CARB
SMEC NEXT TO WALL-THEN HEMATITE WITH SMEC*
Leg : 37 Top/Bottom Interval(mm): 640/ 0 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 282.50 Rock Type: IGNEOUS
Core: 25 Sample Midpoint(m) : 283.14 Sect/Pc #: 1/PCE 7
ROCK = PLAG-CPX SPARSELY PHYRIC BASALT;
Texture: INTERGRANULAR,INTERSERTAL,GLASSY,SUBOPHITIC
BARELY SUBOPHITIC*
Phenocrysts- PLAGIOCLASE ( <1%)
FRESH,IN CLOTS 2.0MM ACROSS,PLAG
+ AUGITE OCCUR TOGETHER IN A GLOMEROCRYST,PLAG
ALSO OCCURS SEPARATELY;
CLINOPYROXENE ( <1%)
FRESH,IN CLOTS 2.0MM ACROSS,2VZ 45,PLAG
+ AUGITE OCCUR TOGETHER IN A GLOMEROCRYST*
Groundmass - PYROXENE ( 40%)
Size(mm): 0.04
2VZ 45;
PLAGIOCLASE ( 35%)
Size(mm): 0.1-1.0
GLASS ( 20%)
ALTERED;
MAGNETITE ( 5%)
MUCH LARGER AND MORE CLEARLY DEFINED THAN IN MOST
OF THE OTHER ROCK IN THIN SECTIONS AROUND IT*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
YELLOW SMECTITES FORM GOOD RIMS WITH RADIAL
STRUCTURE AND DISORGANIZED IN FILLINGS(IN FORMER
CAVITIES?),ORANGE SMECTITES ARE MUCH LESS UNIFORM
IN COLOR BUT APPEAR TO BE COARSER GRAINED AND HAVE
MORE OF A BOOK-LIKE FORM,REPLACING GLASS(?);
SMECTITE
Replacing: GLASS
ID UNCERTAIN;
SMECTITE
Location: VEINS
SMEC IN VEINS-ORANGE ALONG MARGINS(FORMER GLASS?)
AND YELLOW IN MIDDLE,LATER IN FILLINGS*
Vesicles -
Size(mm): 0.1-0.4
Percent: 10
Filling: SMEC
PARTS OF THE SLIDE HAVE 40% VESICLES-IS IT
DIKTYTAXITIC(?) OR PLUCKED GLASS(?),OTHER PARTS
HAVE 25% SMECTITE-SO SUSPECT APPARENT POROSITY IS
REAL,SMEC AREAS CORRESPOND TO OXIDIZED APPEARING
PARTS OF THE ROCK-THESE CAVITIES ARE INTERSTITIAL
IN SHAPE,THERE ARE ALSO ABOUT 5% ROUND VESICLES*
Leg : 37 Top/Bottom Interval(mm): 900/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 282.50 Rock Type: IGNEOUS
Core: 25 Sample Midpoint(m) : 283.40 Sect/Pc #: 1/PCE 10A
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: INTERGRANULAR,INTERSERTAL,TRACHYTOID,GLASSY
POORLY FORMED INTERGRANULAR TEX*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): TO 0.2
SMALL INDIVIDUAL XTLS(MICROPHENOS)*
Groundmass - OLIVINE
ALTERED TO SERPENTINE,RARE AREAS WHERE OL FORM IS
PRESERVED;
GLASS
FRESH AND ALTERED,LIGHT BROWN,SOME GOOD FOR PROBE;
PLAGIOCLASE
Size(mm): 0.01-0.1
PYROXENE
Size(mm): 0.01-0.1
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SERPENTINITE
Location: GROUNDMASS Replacing: OL
ID UNCERTAIN,RARE AREAS WHERE OL FORM PRESERVED;
SMECTITE
Replacing: GLASS
CARBONATE
Location: VEINS
Vesicles -
Size(mm): 0.3
Percent: 3
Filling: SMEC,SILICA
SILICA NEXT TO WALL-THEN SMEC-THEN LIMONITE(?),
ID FOR LIMONITE UNCERTAIN*
Leg : 37 Top/Bottom Interval(mm): 1280/1300 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 282.50 Rock Type: IGNEOUS
Core: 25 Sample Midpoint(m) : 283.79 Sect/Pc #: 1/PCE 15
ROCK = PLAG-OL MODERATELY PHYRIC BASALT;
Texture: INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): <0.5
FRESH,ONE PLAG CLOT IS 4.0MM,MOST ARE <0.5MM;
OLIVINE ( <1%)
Size(mm): <0.5
FRESH*
Groundmass - OLIVINE
Size(mm): <0.1
MOSTLY FRESH,OL COMMON IN GROUNDMASS;
PLAGIOCLASE
Size(mm): <0.1
PYROXENE
Size(mm): <0.1
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: OL
REPLACING GROUNDMASS OLIVINE ONLY,LOCALIZED*
Vesicles -
Filling: SMEC,GLASS
Leg : 37 Top/Bottom Interval(mm): 440/ 470 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 292.00 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 292.46 Sect/Pc #: 1/
ROCK = PLAG MODERATELY PHYRIC BASALT;
Texture: INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( 1-5%)
FRESH,APPROX COMP AN55-60*
Groundmass - OLIVINE
Size(mm): 0.1-1.0
PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Replacing: GLASS
CHLOROPHAEITE
Replacing: GLASS
SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
CARBONATE
Location: INTERSTITIAL Replacing: GROUNDMASS
CHLOROPHAEITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Size(mm): 2.0
Percent: 3
Leg : 37 Top/Bottom Interval(mm): 780/ 830 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 292.00 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 292.81 Sect/Pc #: 1/PCE 7
ROCK = PLAG MODERATELY PHYRIC BASALT;
Texture: VARIOLITIC,INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( 1-5%)
FRESH*
Groundmass - PLAGIOCLASE
PYROXENE
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Replacing: GLASS
BAND OF CHLOROPH(??)-SMEC-FE.OXIDE/HYDROXIDE
ALTERATION AFFECTING VESICLES AND GROUNDMASS*
Vesicles -
Size(mm): TO 2.0
Percent: 20
Filling: SMEC,CARB
BAND OF CHLOROPH(??)-SMEC-FE.OXIDE/HYDROXIDE
ALTERATION AFFECTING VESICLES AND GROUNDMASS*
Leg : 37 Top/Bottom Interval(mm): 90/ 150 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 292.00 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 293.62 Sect/Pc #: 2/PCE 2
ROCK = PLAG-CPX-OL SPARSELY PHYRIC BASALT
IGNEOUS(GLASSY) FRAGMENTS INCLUDED BY CHALK
SEDIMENTS;
Texture: GLASSY*
Phenocrysts- PLAGIOCLASE ( <1%)
"MICROGLOMEROPORPHS" IN GLASS OF PLAG + CPX + OL-
ALSO ISOLATED PLAG LATHS 1-2MM LONG AND VERY FRESH
ARE INCLUDED IN GLASS AND ITS ALTERATION PRODUCTS;
CLINOPYROXENE ( <1%)
MICROGLOMEROPORPHS IN GLASS OF PLAG + CPX + OL,
FRESH;
OLIVINE ( <1%)
Size(mm): TO 0.5
MICROGLOMEROPORPHS IN GLASS OF PLAG + CPX + OL,
FRESH,SKELETAL,2VX OF 85*
Groundmass - GLASS
FRESH AND ALTERED,FRESH GLASS IS DARK-COLORED AND
ALTERS TO PATCHES OF RARE SMEC(ANISOTROPIC) AND
POSSIBLY DARKER BROWN FE.OXIDE OR FE.HYDRX PHASES;
OLIVINE
TINY GRAINS IN GLASS*
Alteration - SMECTITE
Replacing: GLASS
CARBONATE
Replacing: GLASS
OTHER
Replacing: GLASS
FE.OXIDE-HYDRXS(?),STIPPLE-LIKE DEVITRIFICATION
EFFECTS VISIBLE*
Vesicles -
Size(mm): <0.5
Percent: 2
Filling: EMPTY
Leg : 37 Top/Bottom Interval(mm): 380/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 292.00 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 293.88 Sect/Pc #: 2/PCE 5
ROCK = PLAG MODERATELY PHYRIC BASALT;
Texture: VARIOLITIC,APHANITIC-CRYPTOCRYSTALLINE*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): TO 2.0
Groundmass - OLIVINE
ALTERED OL IN GROUNDMASS,REPLACED AND FRESH;
PYROXENE
Alteration -
Location: GROUNDMASS Replacing: OL
Vesicles -
Filling: CARB,ZEOLITE
Leg : 37 Top/Bottom Interval(mm): 1460/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 292.00 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 294.96 Sect/Pc #: 2/PCE 20
ROCK = PLAG-OL MODERATELY PHYRIC BASALT;
Texture: VARIOLITIC*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): 0.2-0.3
MICROPHENOS,APPROX COMP AT LEAST AN60,BEAUTIFUL
SKELETAL PLAG;
OLIVINE ( <1%)
FRESH,SEVERAL SMALL XTLS*
Groundmass - PLAGIOCLASE
PYROXENE
MAGNETITE
GLASS
FRESH*
Alteration - SMECTITE
Replacing: GLASS
MINOR*
Vesicles -
Size(mm): TO 3.0
Percent: 3-5
Filling: SMEC,CARB,GLASS
COALESCED*
Leg : 37 Top/Bottom Interval(mm): 350/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 301.50 Rock Type: IGNEOUS
Core: 27 Sample Midpoint(m) : 301.85 Sect/Pc #: 1/PCE 6
ROCK = PLAG MODERATELY PHYRIC BASALT;
FRESH ROCK;
Texture: INTERGRANULAR,VARIOLITIC*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): 0.2-0.8
SOME MICROPHENOS TO 1MM;
OLIVINE ( <1%)
Size(mm): TO 0.3
FRESH,MICROPHENOS*
Groundmass - OLIVINE
Size(mm): 0.01-0.02
FRESH OL IN GROUNDMASS;
PLAGIOCLASE
Size(mm): 0.01-0.02
PYROXENE
Size(mm): 0.01-0.02
MAGNETITE
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Filling: GLASS
Leg : 37 Top/Bottom Interval(mm): 600/ 0 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 301.50 Rock Type: IGNEOUS
Core: 27 Sample Midpoint(m) : 302.10 Sect/Pc #: 1/PCE 9
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT;
Texture: VARIOLITIC,INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): >0.5
FRESH AND ALTERED;
AUGITE ( <1%)
Size(mm): <0.5
FRESH AND ALTERED,CPX + OL MICROPHENOS SHOW
STRIKING DISEQUILIBRIUM EFFECTS FROM ALTERATION-
MAYBE DEUTERIC FO2 + FH2 CHANGES(?);
OLIVINE ( <1%)
ALTERED,SIZE RANGE BOTH >0.5MM + <0.5MM,OL + CPX
MICROPHENOS SHOW STRIKING DISEQUILIBRIUM EFFECTS
FROM ALTERATION-MAYBE DEUTERIC FO2 + FH2
CHANGES(?)
Groundmass - OLIVINE
Size(mm): 0.1-1.0
PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Replacing: GLASS
BAND OF SMEC ALTERATION;
OPAQUE MINERALS
Replacing: GLASS
SMECTITE
Replacing: GROUNDMASS
FERROUS OXIDE
Replacing: GROUNDMASS
SMECTITE
Replacing: OL PHENOS
CARBONATE
Replacing: OL PHENOS
OPAQUE MINERALS
Replacing: CPX PHENOS
Vesicles -
Size(mm): 0.4
Percent: 5
Filling: SMEC,CARB
BAND OF SMEC ALTERATION AFFECTING GLASS
REPLACEMENTS + VESICLES*
Leg : 37 Top/Bottom Interval(mm): 1280/1310 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 301.50 Rock Type: IGNEOUS
Core: 27 Sample Midpoint(m) : 302.80 Sect/Pc #: 1/PCE 20
ROCK = PLAG-CPX MODERATELY PHYRIC BASALT
ROCK HAS SYMPLECTIC INTERGROWTH OF FE.HYDRX(?)-
SMEC ALTERATION PRODUCTS;
Texture: INTERGRANULAR,INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): >0.5
FRESH;
CLINOPYROXENE ( <1%)
Size(mm): >0.5
FRESH*
Groundmass - PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Replacing: GLASS
SYMPLECTIC INTERGROWTH OF FE.HYDRX(?)-SMEC
ALTERATION PRODUCTS;
FERROUS HYDROX MINS
Vesicles -
Size(mm): 0.3
Percent: 1
Filling: SMEC
Leg : 37 Top/Bottom Interval(mm): 1390/ 0 Describer: Robinson, P.
Hole: 332A Top of Core Depth(m) : 301.50 Rock Type: IGNEOUS
Core: 27 Sample Midpoint(m) : 302.89 Sect/Pc #: 1/PCE 21
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: VARIOLITIC,INTERSERTAL
SLIGHTLY VARIOLITIC;
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): TO 3.0 Morphology: LATHS
FRESH,MOST ARE LATHS 0.2-0.5MM LONG*
Groundmass - CLINOPYROXENE
RADIATING SHEAVES OF CPX + INTERSTITIAL GLASS WITH
NEEDLE-LIKE OPAQUES,2VZ 45;
GLASS
GLASS GENERALLY FRESH BUT PERHAPS SOME REPLACEMENT
BY SILICA(?)
OPAQUE MINERALS
NEEDLE-LIKE OPAQUES IN INTERSTITIAL GLASS AND
RADIATING SHEAVES OF CPX*
Alteration - SMECTITE ( TR-2%)
Replacing: GLASS
SILICA
Replacing: GLASS
ID UNCERTAIN,GLASS GENERALLY FRESH BUT PERHAPS
SOME REPLACEMENT BY SILICA(?)*
Vesicles -
Size(mm): 0.1-0.5
Filling: CALCITE
MANY MICROVESICLES IN GLASSY ZONES(0.1MM)-A FEW UP
TO 0.5MM,LARGER ONES PARTLY FILLED WITH CALCITE*
Leg : 37 Top/Bottom Interval(mm): 150/ 0 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 311.00 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 311.15 Sect/Pc #: 1/PCE 2
ROCK = OL SPARSELY PHYRIC BASALT;
Texture: VARIOLITIC,INTERGRANULAR,INTERSERTAL*
Phenocrysts- OLIVINE ( <1%)
Size(mm): >0.5
SKELETAL OL MICROPHENOS-EITHER CORRODED BY LIQUID
OR INTRUDED LIQUID DURING XTL GROWTH-PREMATURELY
ARRESTED REACTION PRODUCTS;
PLAGIOCLASE ( <1%)
Size(mm): <0.5
FRESH*
Groundmass - OLIVINE
MINOR;
PLAGIOCLASE
PYROXENE
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN;
GLASS
FRESH AND SOME ALTERED GLASS*
Alteration - SMECTITE
Replacing: OL PHENOS
CARBONATE
Replacing: OL PHENOS
Vesicles -
Size(mm): <1.0
Percent: 1-2
Filling: SMEC,CARB
Leg : 37 Top/Bottom Interval(mm): 830/ 860 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 311.00 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 311.85 Sect/Pc #: 1/PCE 10
ROCK = PLAG-OL MODERATELY PHYRIC BASALT;
Texture: VARIOLITIC,INTERSERTAL,GLASSY*
Phenocrysts- PLAGIOCLASE ( 1-5%)
FRESH,MICROPHENOS;
OLIVINE ( <1%)
ALTERED*
Groundmass - OLIVINE
Size(mm): 0.1-1.0
PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
ILMENITE
GLASS
FRESH AND ALTERED*
Alteration - SMECTITE
Replacing: GLASS
SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
CARBONATE
Replacing: OL PHENOS
SMECTITE
Replacing: OL PHENOS
Vesicles -
Filling: SMEC,CARB,
Filling: OP.MINS
Leg : 37 Top/Bottom Interval(mm): 910/ 960 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 311.00 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 311.93 Sect/Pc #: 1/PCE 11
ROCK = PLAG-OL MODERATELY PHYRIC BASALT;
Texture: APHANITIC-CRYPTOCRYSTALLINE
AREAS OF INCIPIENT VARIOLITIC GROWTH*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): 0.5-1.0
FRESH,PATCHY ZONING;
OLIVINE ( <1%)
Size(mm): 0.5-1.0
SKELETAL WITH INTERGROWN PLAG*
Groundmass - OLIVINE
RARE,FRESH;
PLAGIOCLASE
PYROXENE
FIBROUS,WELL-CRYSTALLIZED,ABUNDANT;
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
CARBONATE
Location: INTERSTITIAL Replacing: GROUNDMASS
CHLOROPHAEITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Size(mm): 0.3-0.7
Percent: 2
Filling: SMEC,GLASS
GLASS IS DEVITRIFIED*
Leg : 37 Top/Bottom Interval(mm): 1100/ 0 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 311.00 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 312.10 Sect/Pc #: 1/PCE 13
ROCK = PLAG-OL SPARSELY PHYRIC BASALT;
Texture: VARIOLITIC
VERY COARSE-GRAINED APHYRIC TEX,PYROXENES APPEAR
OPHITIC BUT SWEEPING EXTINCTION SUGGESTS
AGGREGATES RATHER THAN SINGLE XTLS*
Phenocrysts- PLAGIOCLASE ( <1%)
FRESH,MICROPHENOS;
OLIVINE ( <1%)
FRESH,MICROPHENOS*
Groundmass - PYROXENE ( 45%)
Size(mm): 0.1-1.0
GLASS ( 25%)
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): 0.1-1.0
MAGNETITE ( 2%)
OLIVINE ( TR%)
POSSIBLE TRACE OF OL- JUST A TINY REMNANT OF A
MINERAL,2 DEGREES RED-2 DEGREES BLUE WITH UNIFORM
EXTINCTION ALMOST COMPLETELY REPLACED BY SMECTITE,
MAY HAVE BEEN SEVERAL PERCENT ORIGINALLY*
Alteration - SMECTITE
Replacing: GLASS
THERE ARE MANY SPACES WHERE SEVERAL VARIOLITIC
AGGREGATES APPROACH EACH OTHER-PLUCKED(?) OR
DIKTYTAXITIC-MANY ARE NOW FILLED WITH SMEC;
CHLOROPHAEITE
Replacing: GLASS
Vesicles -
Size(mm): 0.1-0.2
Percent: 8
Filling: SMEC,SILICA,
Filling: GLASS,HEMATITE
EXCELLENT EXAMPLES OF FINE-GRAINED LININGS OF
VESICLES AND SHOULD GET COMPOSITION WITH PROBE,
GLASS NEXT TO WALL-THEN SMEC-THEN HEMATITE,ID FOR
HEMATITE UNCERTAIN-COLOR IS BRIGHT RED*
Leg : 37 Top/Bottom Interval(mm): 1240/ 0 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 311.00 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 312.24 Sect/Pc #: 1/PCE 15
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: VARIOLITIC,INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( <1%)
FRESH,MICROPHENOS*
Groundmass - PLAGIOCLASE
Size(mm): 0.01-0.1
PYROXENE
Size(mm): 0.01-0.1
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Replacing: GLASS
Vesicles -
Filling: SMEC,FE.HYDRX
Leg : 37 Top/Bottom Interval(mm): 590/ 620 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 311.00 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 313.11 Sect/Pc #: 2/PCE 1
ROCK = PLAG-CPX MODERATELY PHYRIC BASALT;
Texture: INTERGRANULAR,SUBOPHITIC,VARIOLITIC
VARIOLITIC IS RARE*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): 0.2-0.5
FRESH,MICROPHENOS IN CLOTS;
AUGITE ( <1%)
Size(mm): TO 0.15
XTLS ARE 1X1 IN SIZE*
Groundmass - OLIVINE
ID UNCERTAIN,PROBABLE OL NOW PSEUDOMORPHED BY SMEC
AND SOMETIMES WITH A RIM OF SERPENTINE(?) DEFINING
THE OL XTL FORM,RARELY THE REPLACEMENT HAS UNIFORM
PARALLEL EXTINCTION;
PLAGIOCLASE
Size(mm): 0.1
PYROXENE
Size(mm): 0.1
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Location: GROUNDMASS, Replacing: OL
Location: INTERSTITIAL
POSSIBLE OL NOW PSEUDOMORPHED BY SMEC-SOMETIMES
WITH A RIM OF SERP(?) DEFINING THE OL XTL FORM,
RARELY THE REPLACEMENT HAS UNIFORM PARALLEL
EXTINCTION;
SERPENTINITE
Location: GROUNDMASS Replacing: OL
ID UNCERTAIN,SOMETIMES A RIM DEFINES OL XTL FORM;
SILICA
Location: INTERSTITIAL Replacing: GROUNDMASS
IDDINGSITE
Location: INTERSTITIAL Replacing: GROUNDMASS
HEMATITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Size(mm): TO 0.5
Percent: <1
Filling: SMEC,SILICA,
Filling: GLASS
LIQUID-GAS VESICLE(?),DEVITRIFIED GLASS NEXT TO
WALL-THEN SMEC IN CENTER*
Leg : 37 Top/Bottom Interval(mm): 130/ 0 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 320.50 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 320.63 Sect/Pc #: 1/PCE 2
ROCK = PLAG-CPX-OL SPARSELY PHYRIC BASALT;
Texture: VARIOLITIC
TEX IS HIGHLY VARIABLE ACROSS SLIDE-PILLOW
MARGIN(?),GRAIN SIZE UNIFORM AT APPROX 0.08MM
RANGING TO A FEW MICROMETERS*
Phenocrysts- PLAGIOCLASE ( <1%)
FRESH,MICROPHENOS,ONE SMALL GLOMEROPORPHYRITIC
PLAG-AUGITE CLOT;
AUGITE ( <1%)
FRESH,MICROPHENOS,ONE SMALL PLAG-AUGITE
GLOMEROPORPHYRITIC CLOT;
OLIVINE ( <1%)
FRESH,MICROPHENOS*
Groundmass - PYROXENE ( 40%)
Size(mm): 0.01-0.1
PLAGIOCLASE ( 30%)
Size(mm): 0.01-0.1
GLASS ( 27%)
ALTERED;
MAGNETITE ( 3%)
Vesicles -
Filling: SMEC,GLASS,
Filling: HEMATITE
GLASS NEXT TO WALL-THEN SMEC-THEN HEMATITE*
Leg : 37 Top/Bottom Interval(mm): 130/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 320.50 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 320.63 Sect/Pc #: 1/PCE 2
ROCK = APHYRIC BASALT;
Texture: APHANITIC-CRYPTOCRYSTALLINE*
Groundmass - OLIVINE
MICROPHENOS PSEUDOMORPHED BY SMEC + IDDINGS(?);
Alteration - SMECTITE
Location: GROUNDMASS Replacing: OL
SMECTITE
Replacing: OL PHENOS
OL MICROPHENOS PSEUDOMORPHED BY OXIDIZED SMEC +
IDDINGS(?);
IDDINGSITE
Replacing: OL PHENOS
ID UNCERTAIN,OL MICROPHENOS PSEUDOMORPHED BY
OXIDIZED SMEC + IDDINGS(?);
CARBONATE
Location: VEINS
Vesicles -
Filling: CARB
Leg : 37 Top/Bottom Interval(mm): 330/ 360 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 320.50 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 320.85 Sect/Pc #: 1/PCE 5
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: INTERSERTAL,VARIOLITIC*
Phenocrysts- PLAGIOCLASE (15-20%)
Size(mm): 0.8-2.0 Morphology: EUHEDRAL-SUBHEDRAL
FRESH,BROWN GLASS INCLUSIONS OF 0.1-0.2MM,NARROW
RIM OF SODIC COMP,SOME OTHER ZONING BUT WEAK,
AT LEAST AN68,USUALLY SINGLE XTLS BUT SOME CLOTS*
Groundmass - GLASS
FRESH AND ALTERED,BROWN,AS INCLUSIONS IN THE PLAG
XTLS,GOOD FOR PROBE;
OLIVINE
ALTERED,PSEUDOMORPHED BY SMEC + SERPENTINE(?) +
CARB*
Alteration - SMECTITE
Location: INTERSTITIAL, Replacing: OL
Location: GROUNDMASS
PSEUDOMORPH OF OL;
CARBONATE
Location: INTERSTITIAL, Replacing: OL
Location: GROUNDMASS
PSEUDOMORPH OF OL;
SERPENTINITE
Location: INTERSTITIAL, Replacing: OL
Location: GROUNDMASS
ID UNCERTAIN,PSEUDOMORPH OF OL*
Vesicles -
Size(mm): 0.8
Percent: 3
Filling: SMEC,GLASS
GLASS IS DEVITRIFIED*
Leg : 37 Top/Bottom Interval(mm): 710/ 770 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 320.50 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 321.24 Sect/Pc #: 1/PCE 10
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: SUBOPHITIC*
Phenocrysts- PLAGIOCLASE ( 20%)
Size(mm): TO 3.0
FRESH;
OLIVINE ( <1%)
ALTERED*
Groundmass - OLIVINE
Size(mm): 0.2-0.3
GROUNDMASS OL ALTERED TO SMEC-POSSIBLY ABUNDANT,
ALSO FRESH OL SEEN;
GLASS
FRESH AND ALTERED,SOME FRESH GLASS FOR PROBE;
PLAGIOCLASE
Size(mm): 0.2-0.3
PYROXENE
Size(mm): 0.2-0.3
2VZ 45;
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SILICA
Location: INTERSTITIAL Replacing: GROUNDMASS
SMECTITE
Location: INTERSTITIAL, Replacing: OL
Location: GROUNDMASS
GROUNDMASS OL ALTERED TO SMEC-POSSIBLY ABUNDANT;
SILICA
Replacing: OL PHENOS
ID UNCERTAIN*
Vesicles -
Filling: SILICA
ABUNDANT*
Leg : 37 Top/Bottom Interval(mm): 1240/1270 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 320.50 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 321.76 Sect/Pc #: 1/PCE 2A
ROCK = PLAG-CPX-OL SPARSELY PHYRIC BASALT;
Texture: INTERGRANULAR*
Phenocrysts- OLIVINE ( <1%)
ALTERED,OL + CPX + PLAG "GLOMEROPORPHS";
PLAGIOCLASE ( <1%)
FRESH,MICROPHENOS,OL + CPX + PLAG "GLOMEROPORPHS";
CLINOPYROXENE ( <1%)
FRESH,MICROPHENOS,OL + CPX + PLAG "GLOMEROPORPHS"*
Groundmass - OLIVINE
Size(mm): 0.1-1.0
PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Replacing: GLASS
CHLOROPHAEITE
Replacing: GLASS
Vesicles -
Size(mm): 0.5
Percent: 5
Filling: SMEC,CHLOROPH
Leg : 37 Top/Bottom Interval(mm): 1410/1440 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 320.50 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 321.93 Sect/Pc #: 1/PCE 19
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: INTERGRANULAR,SUBOPHITIC*
Phenocrysts- PLAGIOCLASE (10-15%)
Size(mm): 0.8-2.0
FRESH,STAINED ALONG CRACKS*
Groundmass - OLIVINE
Size(mm): 0.05
COMMON,ALTERED TO SMEC + IDDINGS;
PLAGIOCLASE
Size(mm): 0.05
PYROXENE
Size(mm): 0.05
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Location: INTERSTITIAL, Replacing: OL
Location: GROUNDMASS
IDDINGSITE
Location: INTERSTITIAL, Replacing: OL
Location: GROUNDMASS
Vesicles -
Size(mm): TO 0.8
Percent: 2
Filling: GLASS
Leg : 37 Top/Bottom Interval(mm): 680/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 330.00 Rock Type: IGNEOUS
Core: 30 Sample Midpoint(m) : 330.68 Sect/Pc #: 1/PCE 10
ROCK = PLAGIOCLASE PHYRIC BASALT
FRESH ROCK,GOOD FOR ANALYSIS;
Texture: VARIOLITIC,APHANITIC-CRYPTOCRYSTALLINE*
Phenocrysts- PLAGIOCLASE (10-15%)
Size(mm): 0.8-1.5
FRESH;
OLIVINE ( <1%)
Size(mm): 0.8-1.5 Morphology: ANHEDRAL-ROUNDED
FRESH,ONE LARGE XTL;
AUGITE ( <1%)
ONE SMALL PLAG-PYX CLOT*
Groundmass - OLIVINE
Size(mm): 0.01
ABUNDANT AND FRESH;
PLAGIOCLASE
Size(mm): 0.01
LOTS OF SKELETAL GROUNDMASS PLAG;
PYROXENE
Size(mm): 0.01
LOTS OF TUFTED PYX;
MAGNETITE
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
SMECTITE
Replacing: GLASS
Vesicles -
Filling: SMEC,CARB,GLASS
Leg : 37 Top/Bottom Interval(mm): 1270/1300 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 330.00 Rock Type: IGNEOUS
Core: 30 Sample Midpoint(m) : 331.29 Sect/Pc #: 1/PCE 10
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: INTERGRANULAR
LARGE PLAG*
Phenocrysts- PLAGIOCLASE ( 15%)
Size(mm): TO 4.0
FRESH,INCLUSIONS OF GLASS IN PLAG-MAY BE
RESPONSIBLE FOR THE DARK COLOR IN HAND SPECIMEN*
Groundmass - GLASS
FRESH,BROWN,GOOD GLASS FOR PROBE;
OLIVINE
Size(mm): >0.05
PLAGIOCLASE
Size(mm): >0.05
PYROXENE
Size(mm): >0.05
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Size(mm): TO 0.4
Percent: 2
Filling: SMEC,CARB
Leg : 37 Top/Bottom Interval(mm): 1340/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 330.00 Rock Type: IGNEOUS
Core: 30 Sample Midpoint(m) : 331.34 Sect/Pc #: 1/PCE 20
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: INTERSERTAL*
Phenocrysts- PLAGIOCLASE (10-15%)
Size(mm): 0.2-0.8
FRESH*
Groundmass - GLASS
FRESH AND ALTERED,SOME GLASS GOOD FOR PROBE;
PLAGIOCLASE
Size(mm): TO 0.1
PYROXENE
Size(mm): TO 0.1
Alteration - SMECTITE
Replacing: GLASS
SILICA
Replacing: GLASS
Vesicles -
Filling: SMEC,SILICA
Leg : 37 Top/Bottom Interval(mm): 110/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 330.00 Rock Type: IGNEOUS
Core: 30 Sample Midpoint(m) : 331.61 Sect/Pc #: 2/PCE 22
ROCK = PLAGIOCLASE PHYRIC BASALT
VERY FRESH ROCK;
Texture: VARIOLITIC,INTERSERTAL*
Phenocrysts- PLAGIOCLASE (10-15%)
Size(mm): 0.6-3.0
OLIVINE ( <1%)
FRESH,GOOD FOR PROBE,2VZ 88*
Groundmass - GLASS
FRESH GLASS FOR PROBE;
OLIVINE
PLAGIOCLASE
PYROXENE
MAGNETITE
Vesicles -
Filling: CARB
Leg : 37 Top/Bottom Interval(mm): 610/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 330.00 Rock Type: IGNEOUS
Core: 30 Sample Midpoint(m) : 332.11 Sect/Pc #: 2/PCE 28A
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: VARIOLITIC,INTERGRANULAR,INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( 20%)
Size(mm): 0.8-3.0
FRESH*
Groundmass - OLIVINE
Size(mm): 0.01-0.1
FRESH;
PLAGIOCLASE
Size(mm): 0.01-0.1
LONG SKELETAL PLAG XTLS;
PYROXENE
Size(mm): 0.01-0.1
FEATHERY BUT EQUANT PYX TUFTS;
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
CHLOROPHAEITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Filling: SMEC,GLASS
Leg : 37 Top/Bottom Interval(mm): 800/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 330.00 Rock Type: IGNEOUS
Core: 30 Sample Midpoint(m) : 332.30 Sect/Pc #: 2/PCE 30
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: APHANITIC-CRYPTOCRYSTALLINE*
Phenocrysts- PLAGIOCLASE (10-15%)
Size(mm): 0.6-1.0
Groundmass - OLIVINE
FRESH OL IN GROUNDMASS-GOOD FOR PROBE;
GLASS
FRESH*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Filling: SMEC,ZEOLITE
ID FOR ZEOLITE UNCERTAIN*
Leg : 37 Top/Bottom Interval(mm): 1000/ 0 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 330.00 Rock Type: IGNEOUS
Core: 30 Sample Midpoint(m) : 332.50 Sect/Pc #: 2/PCE 33
ROCK = PLAGIOCLASE-CPX PHYRIC BASALT;
Texture: VARIOLITIC,INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( >5%)
Size(mm): >0.5
FRESH AND ALTERED,LARGE GLASSY INCLUSIONS,CORES OF
SOME LARGE PLAG PHENOS SAUSSURITIZED-SOME PLAG
PHENOS ARE QUASI-GLOMEROPORPHYRITIC;
AUGITE ( <1%)
ALTERED*
Groundmass - PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
MAGNETITE
Alteration - SMECTITE
Replacing: GLASS
OPAQUE MINERALS
Replacing: GLASS
SILICA
Location: INTERSTITIAL Replacing: GROUNDMASS
SERICITE
Replacing: PLAG PHENOS
ID UNCERTAIN*
Vesicles -
Size(mm): 0.5
Filling: SMEC,SILICA,
Filling: ZEOLITE
Leg : 37 Top/Bottom Interval(mm): 230/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 339.50 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 339.73 Sect/Pc #: 1/PCE 3
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: INTERSERTAL,VARIOLITIC*
Phenocrysts- PLAGIOCLASE ( 15%)
Size(mm): 0.8-1.2
FRESH,GLASS INCLUSIONS IN PLAG,WITH EXSOLUTION(?)*
Groundmass - OLIVINE
Size(mm): 0.05
REPLACED BY SMECTITE;
PLAGIOCLASE
Size(mm): 0.05
PYROXENE
Size(mm): 0.05
MAGNETITE
GLASS
ZONES,OXIDIZED,PROBABLY GOOD FOR PROBE*
Alteration - SMECTITE
Location: INTERSTITIAL, Replacing: OL
Location: GROUNDMASS
Vesicles -
Filling: SMEC,CARB
Leg : 37 Top/Bottom Interval(mm): 700/ 0 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 339.50 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 340.20 Sect/Pc #: 1/PCE 10
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: VARIOLITIC*
Phenocrysts- PLAGIOCLASE ( >5%)
FRESH*
Groundmass - GLASS
Size(mm): 0.1-1.0
ALTERED;
OLIVINE
Size(mm): 0.1-1.0
PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Replacing: GLASS
CHLOROPHAEITE
Replacing: GLASS
SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
ZEOLITE
Location: INTERSTITIAL Replacing: GROUNDMASS
LAUMONTITE;
CARBONATE
Replacing: PLAG,OL PHENOS
CARBONATE
Location: VEINS
OTHER
Location: VEINS
SEDIMENT(CALCAREOUS)*
Vesicles -
Size(mm): <1.0
Percent: 3-5
Filling: CARB,CHLOROPH
Leg : 37 Top/Bottom Interval(mm): 1370/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 339.50 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 340.87 Sect/Pc #: 1/PCE 20
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: INTERGRANULAR,VARIOLITIC*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): 1.0-1.5
FRESH,GLASS INCLUSIONS COMMON IN THE CORE OF PLAG
PHENOS;
OLIVINE ( <1%)
FRESH AND ALTERED IN PART,ONE PHENO-STRAINED(?)*
Groundmass - OLIVINE
Size(mm): 0.04
ABUNDANT,MOSTLY FRESH;
PLAGIOCLASE
Size(mm): 0.04
PYROXENE
Size(mm): 0.04
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE
Location: INTERSTITIAL, Replacing: OL,GLASS
Location: GROUNDMASS
CLAY MINERALS
Location: INTERSTITIAL, Replacing: OL
Location: GROUNDMASS
BROWN CLAY AFTER OLIVINE*
Vesicles -
Size(mm): TO 1.0
Percent: 2
Filling: SMEC,CARB,GLASS
MOST ARE 0.4MM*
Leg : 37 Top/Bottom Interval(mm): 320/ 350 Describer: Robinson, P.
Hole: 332A Top of Core Depth(m) : 339.50 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 341.34 Sect/Pc #: 2/PCE 4
ROCK = PLAG MODERATELY PHYRIC BASALT;
Texture: INTERGRANULAR,INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): >0.5
FRESH,UNZONED EXCEPT FOR NARROW RIM,SOME
GLOMEROPORPHYRITIC CLUSTERS*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): 0.1-1.0
PYROXENE ( 40%)
Size(mm): 0.1-1.0
APPROX COMP AUGITE,2VZ 45;
OLIVINE ( 5%)
GROUNDMASS OL IN 0.1MM XTLS ALMOST COMPLETELY
REPLACED BY SMEC + CARB;
OPAQUE MINERALS ( 5%)
INCLUDES ILMENITE + MAGN*
Alteration - SMECTITE ( TR%)
Location: INTERSTITIAL, Replacing: OL
Location: GROUNDMASS
CARBONATE ( TR%)
Location: INTERSTITIAL, Replacing: OL
Location: GROUNDMASS
Vesicles -
Size(mm): 0.5-2.0
Percent: 5
Filling: SMEC,CARB,GLASS
SMEC NEXT TO WALL-THEN CARB,GLASSY ZONE AROUND RIM
OF VESICLE-A FEW GLASSY VESICLE-LIKE MASSES IN THE
GROUNDMASS*
Leg : 37 Top/Bottom Interval(mm): 810/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 339.50 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 341.81 Sect/Pc #: 2/PCE 11
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: INTERSERTAL,SUBOPHITIC*
Phenocrysts- PLAGIOCLASE ( 5-10%)
Size(mm): TO 1.5
FRESH*
Groundmass - GLASS
ALTERED,OXIDIZED;
OLIVINE
Size(mm): 0.2
ID UNCERTAIN-ALTERED;
PYROXENE
Size(mm): 0.2
PYX HAS VERY WAVY EXTINCTION;
PLAGIOCLASE
Size(mm): 0.2
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN*
Alteration - CARBONATE
Location: VEINS
Vesicles -
Size(mm): TO 1.5
Percent: 3
Filling: SMEC,CARB,GLASS
GLASS IS WITH XTLS AND DEVITRIFIED*
Leg : 37 Top/Bottom Interval(mm): 990/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 339.50 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 341.99 Sect/Pc #: 2/PCE 13
ROCK = PLAG MODERATELY PHYRIC BASALT
SECTION SOMEWHAT TOO THICK;
Texture: INTERGRANULAR,INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): 0.4-1.0
FRESH AND ALTERED-SOME CLAY-SERICITE*
Groundmass - OLIVINE
Size(mm): 0.08
RARE AND ENTIRELY ALTERED IF PRESENT;
PLAGIOCLASE
Size(mm): 0.08
PYROXENE
Size(mm): 0.08
ILMENITE
ID UNCERTAIN;
MAGNETITE
LONG TRAINS OF ATTACHED OCTAHEDRA;
GLASS
DEVITRIFIED*
Alteration - OTHER
Replacing: GLASS
DEVITRIFICATION;
SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS,
Replacing: GLASS
Vesicles -
Size(mm): 1.5-2.5
Percent: 5
Filling: GLASS
Leg : 37 Top/Bottom Interval(mm): 150/ 0 Describer: Robinson, P.
Hole: 332A Top of Core Depth(m) : 339.50 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 342.65 Sect/Pc #: 3/PCE 1B
ROCK = PLAG-OL PHYRIC BASALT
ONE FRAGMENT OF FOSSILIFEROUS SEDIMENT 4MM ACROSS;
Texture: INTERGRANULAR,INTERSERTAL*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 5.0-10.0
FRESH AND ALTERED TO IDDINGS;
PLAGIOCLASE
Size(mm): 1.0-2.0 Morphology: EUHEDRAL
FRESH,SOME CLOTS,OFTEN ZONED WITH SHARP MARGINAL
ZONE*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.01-0.1
PYROXENE ( 40%)
Size(mm): 0.01-0.1
OLIVINE ( 10%)
Size(mm): 0.01-0.1
GROUNDMASS OL MOSTLY REPLACED BY IDDINGS + CARB;
OPAQUE MINERALS ( 5%)
INCLUDES ILMENITE + MAGN;
GLASS
ALTERED,INTERSTITIAL;
OTHER ( 5%)
Alteration - SMECTITE ( TR%)
Replacing: GROUNDMASS
CARBONATE
Location: GROUNDMASS Replacing: OL
IDDINGSITE
Replacing: OL PHENOS, OL
Replacing: GROUNDMASS
Vesicles -
Size(mm): 1.0-2.0
Percent: 5
Filling: CARB,CALCITE
VESICLES PARTLY FILLED WITH HALF SPHERES OF
CALCITE-SOME COMPLETELY FILLED WITH CARB +
ZEOLITE?(PRISMATIC XTLS WITH SQUARE CROSS SECTION)
,NATROLITE(?) + CARB + ZEOLITE MIXED TOGETHER*
Leg : 37 Top/Bottom Interval(mm): 790/ 820 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 339.50 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 343.31 Sect/Pc #: 3/PCE 7D
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: SUBOPHITIC*
Phenocrysts- PLAGIOCLASE ( 15%)
Size(mm): 0.4-1.5
FRESH*
Groundmass - PLAGIOCLASE
Size(mm): 0.2
PYROXENE
Size(mm): 0.2
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
RARE;
SILICA
Location: INTERSTITIAL Replacing: GROUNDMASS,
Replacing: GLASS
Vesicles -
Size(mm): TO 0.4
Percent: 2
Leg : 37 Top/Bottom Interval(mm): 1080/1110 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 349.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 350.10 Sect/Pc #: 1/PCE 14
ROCK = PLAG-OL PHYRIC BASALT;
Texture: VARIOLITIC,INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): >0.5
FRESH,ZONED-SOME OSCILLATIONS;
OLIVINE ( <1%)
Size(mm): >0.5
LARGE OL PHENOCRYST WITH PARALLEL EXTINCTION AND
AN APPARANT TWIN PLANE*
Groundmass - OLIVINE
Size(mm): 0.05
COMMON
PLAGIOCLASE
Size(mm): 0.05
PYROXENE
Size(mm): 0.05
OPAQUE MINERALS
INCLUDES ILMENITE + MAGN;
GLASS
FRESH AND ALTERED,BROWN,GOOD SECTION FOR PROBE
WORK(WIDE BEAM)*
Alteration - SMECTITE
Location: INTERSTITIAL, Replacing: OL,GLASS
Location: GROUNDMASS
Vesicles -
Percent: 1
Filling: GLASS
DEVITRIFIED GLASS,GOOD EXAMPLE OF VESICLE PARTLY
FILLED WITH LIQUID-SEVERAL IN THE SECTION*
Leg : 37 Top/Bottom Interval(mm): 270/ 300 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 349.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 350.79 Sect/Pc #: 2/PCE 2
ROCK = OL PHYRIC BASALT
ALTERED PATCHES IN GROUNDMASS;
Texture: INTERGRANULAR, PORPHYRITIC
GROUNDMASS: INTERSTITIAL*
Phenocrysts- OLIVINE ( >5%)
Size(mm): >0.5
SPINEL
Size(mm): TO 0.25
MICROPHENOS,PICOTITE, VERY FRESH-EVEN IN
THE GROUNDMASS*
Groundmass - OLIVINE
Size(mm): 0.1-1
PLAGIOCLASE
Size(mm): 0.1-1
PYROXENE
Size(mm): 0.1-1
OPAQUE MINERALS
Size(mm): 0.1-1
INCLUDES MAGN+ILMENITE*
Alteration - SMECTITE
Location: GROUNDMASS,
Location: INTERSTITIAL
CARBONATE
Location: GROUNDMASS, Replacing: OL PHENOS
Location: VESICLES
CALCITE;
IDDINGSITE
Location: GROUNDMASS Replacing: OL PHENOS
SERPENTINITE
Location: GROUNDMASS Replacing: OL PHENOS
CHLORITE
Location: GROUNDMASS
ID UNCERTAIN;
FERROUS OXIDE
Location: VESICLES,
Location: GROUNDMASS
SILICA
Location: VESICLES
Vesicles -
Filling: CARB, SILICA,
Filling: FE.OX
FE.OX NEXT TO WALL-THEN SILICA-THEN CARB*
Leg : 37 Top/Bottom Interval(mm): 1150/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 358.50 Rock Type: IGNEOUS
Core: 33 Sample Midpoint(m) : 359.65 Sect/Pc #: 1/
ROCK = PLAGIOCLASE PHYRIC BASALT
CONTACT BETWEEN PHYRIC BASALT AND CARBONATE VEIN-
PROBABLY RECRYSTALLIZED SEDIMENT;
Texture: INTERGRANULAR,VARIOLITIC*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): TO 1.5
FRESH*
Groundmass - OLIVINE
Size(mm): 0.04
COMMON,MOSTLY ALTERED;
PLAGIOCLASE
Size(mm): 0.04
PYROXENE
Size(mm): 0.04
FEATHERY;
MAGNETITE
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
CARBONATE
Location: VEINS
Vesicles -
Size(mm): TO 1.0
Percent: 3
Filling: CARB,GLASS
Leg : 37 Top/Bottom Interval(mm): 120/ 0 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 358.50 Rock Type: IGNEOUS
Core: 33 Sample Midpoint(m) : 360.12 Sect/Pc #: 2/PCE 1
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: VARIOLITIC
STRONGLY DEVELOPED VARIOLITIC TEXTURE*
Phenocrysts- PLAGIOCLASE ( >5%)
FRESH,THIN RIMS MORE SODIC THAN CORE ON PHENOS;
OLIVINE ( <1%)
FRESH*
Groundmass - PYROXENE ( 40%)
AMOUNT UNCERTAIN;
GLASS ( 16%)
ALTERED(15%) + FRESH(1%),SMALL PARTIAL RIMMING OF
UNALTERED GLASS IN SCATTERED VESICLES;
PLAGIOCLASE ( 10%)
XTLS ARE SWALLOWTAILED(0.5X0.02MM),RANDOMLY
ORIENTED,IN FEATHERY MORTAR OF PLAG + PYX(?);
OLIVINE ( 5%)
MICROLITES INTERGROWN WITH PLAG;
MAGNETITE ( 2%)
OPAQUES CLUSTERED ABOUT MARGINS OF PLAG FEATHERS*
Alteration - IDDINGSITE
Replacing: OL PHENOS
IDDINGS ABOUT OLIVINE;
SMECTITE
Replacing: GLASS
ONLY TRACES OF CLEAR YELLOW SMEC PATCHES-WHERE
THEY OCCUR THERE ARE MANY SMALL PATCHES-AND THIN
RIMS OF SIMILAR SMEC IN VESICLES*
Vesicles -
Size(mm): 0.5
Percent: 5
Filling: SMEC,ZEOL,GLASS
ONLY A TRACE OF ALL THREE,GLASS NEXT TO WALL-THEN
SMEC-THEN ZEOL,THIN RIMS OF SMEC IN VESICLES,SMALL
PARTIAL RIMS OF UNALTERED GLASS IN SCATTERED
VESICLES-THE RIMS HAVE SKELETAL FRAGILE MAGN
ASSOCIATED WITH THEM*
Leg : 37 Top/Bottom Interval(mm): 120/ 1 Describer: Robinson, P.
Hole: 332A Top of Core Depth(m) : 358.50 Rock Type: IGNEOUS
Core: 33 Sample Midpoint(m) : 360.06 Sect/Pc #: 2/PCE 1
ROCK = PLAG-OL MODERATELY PHYRIC BASALT;
Texture: VARIOLITIC*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): 0.2-10.0 Morphology: EUHEDRAL
FRESH,OFTEN IN SMALL GLOMEROPORPHYRITIC CLUSTERS;
OLIVINE ( <1%)
Size(mm): >0.5
FRESH*
Groundmass - OLIVINE
Size(mm): 0.01-0.1
<1% OF OL XTLS ARE 0.05-0.1MM ACROSS;
PLAGIOCLASE
Size(mm): 0.01-0.1
A FEW PLAG LATHS SET IN BROWN GLASSY GROUNDMASS
INCIPIENTLY CRYSTALLIZED TO PYX SHEAVES,PLAG LATHS
POORLY TERMINATED WITH TYPICAL SWALLOWTAIL ENDS;
PYROXENE
Size(mm): 0.01-0.1
TINY XTLS OF OPAQUES IN TRAINS ALONG CPX SHEAVES;
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE,TINY XTLS OF OPAQUES IN
TRAINS ALONG CPX SHEAVES;
GLASS
FRESH*
Vesicles -
Size(mm): 0.1-1.0
Percent: 1-2
Filling: SMEC,CARB
ROCK IS VERY FRESH-ONLY TRACES OF CARB AND SMEC IN
SOME VESICLES*
Leg : 37 Top/Bottom Interval(mm): 120/ 2 Describer: Robinson, P.
Hole: 332A Top of Core Depth(m) : 358.50 Rock Type: IGNEOUS
Core: 33 Sample Midpoint(m) : 360.06 Sect/Pc #: 2/PCE 1
ROCK = PLAGIOCLASE-OLIVINE PHYRIC BASALT
OBSERVER MAY HAVE LABELED THIS WRONG;
Texture: INTERGRANULAR,INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( 5-10%)
Size(mm): 1.0-2.0
FRESH,APPROX COMP AT LEAST AN60,SLIGHTLY ZONED ON
RIM;
OLIVINE ( <1%)
FRESH AND ALTERED,OL PHENOCRYST HAS SOME BROWN
BIREFRINGENT INCLUSIONS*
Groundmass - PYROXENE ( 55%)
POORLY CRYSTALLIZED SHEAVES;
PLAGIOCLASE ( 40%)
Size(mm): 0.5 Morphology: LATHS
OLIVINE ( 1%)
2VZ 90;
OPAQUE MINERALS ( 2%)
INCLUDES MAGN + ILMENITE;
GLASS ( TR%)
ALTERED*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
CARBONATE
Location: INTERSTITIAL Replacing: GROUNDMASS
SILICA
Location: INTERSTITIAL Replacing: GROUNDMASS
Replacing: GLASS
ID UNCERTAIN;
IDDINGSITE
Replacing: OL PHENOS
OL RIMMED WITH IDDINGS*
Vesicles -
Size(mm): 0.5-1.0
Percent: 3-5
Filling: SMEC
SOME VESICLES RIMMED WITH BROWN ALTERED ZONES WITH
ABUNDANT ILMENITE*
Leg : 37 Top/Bottom Interval(mm): 920/ 950 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 358.50 Rock Type: IGNEOUS
Core: 33 Sample Midpoint(m) : 360.94 Sect/Pc #: 2/PCE 4
ROCK = APHYRIC BASALT
QUITE FRESH;
Texture: VARIOLITIC,INTERSERTAL*
Groundmass - OLIVINE
Size(mm): 0.1-1.0
PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE;
GLASS
ALTERED*
Alteration - SMECTITE
Replacing: GLASS
OPAQUE MINERALS
Replacing: GLASS
Vesicles -
Size(mm): TO 0.2
Percent: 5-8
Filling: SMEC,CARB,ZEOL
Leg : 37 Top/Bottom Interval(mm): 920/ 950 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 358.50 Rock Type: IGNEOUS
Core: 33 Sample Midpoint(m) : 360.94 Sect/Pc #: 2/PCE 4
ROCK = APHYRIC BASALT
VERY MUCH LIKE PORPHYRITIC VARIETIES OF BASALT BUT
WITH NO PHENOCRYSTS;
Texture: VARIOLITIC,INTERSERTAL*
Groundmass - PLAGIOCLASE
Morphology: SKELETAL
PYROXENE
SHEAVES OF CPX;
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE;
GLASS
FRESH*
Vesicles -
Size(mm): 0.1
Percent: 5-7
Filling: SILICA
Leg : 37 Top/Bottom Interval(mm): 1280/1310 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 358.50 Rock Type: IGNEOUS
Core: 33 Sample Midpoint(m) : 361.30 Sect/Pc #: 2/PCE 4
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: SUBOPHITIC,INTERGRANULAR,INTERSERTAL,VARIOLITIC*
Phenocrysts- PLAGIOCLASE
Size(mm): >0.5
FRESH PLAG(ONLY) "GLOMEROPORPHS",TWO VERY CORRODED
PLAG (XENO?)-CRYSTS*
Groundmass - PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE*
Alteration - SMECTITE
Replacing: GLASS
OTHER
Replacing: PLAG PHENOS
ID UNCERTAIN AS TO WHAT REPLACES PLAG PHENOS*
Vesicles -
Size(mm): 0.2
Percent: 2-4
Filling: SMEC,HEMATITE
ONLY A TRACE OF HEMATITE*
Leg : 37 Top/Bottom Interval(mm): 1040/1070 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 368.00 Rock Type: IGNEOUS
Core: 34 Sample Midpoint(m) : 370.56 Sect/Pc #: 2/PCE 4
ROCK = PLAGIOCLASE SPARSELY PHYRIC BASALT;
Texture: SUBOPHITIC*
Phenocrysts- PLAGIOCLASE
Size(mm): >0.5
FRESH;
AUGITE
ALTERED,ID UNCERTAIN*
Groundmass - OLIVINE
Size(mm): 0.1-1.0
PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE;
GLASS
ALTERED*
Alteration - SMECTITE
Replacing: GLASS
CARBONATE
Replacing: GROUNDMASS
ID UNCERTAIN*
Vesicles -
Size(mm): 0.1-3.0
Percent: 1-2
Filling: SMEC,CARB
Leg : 37 Top/Bottom Interval(mm): 1360/1390 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 368.00 Rock Type: IGNEOUS
Core: 34 Sample Midpoint(m) : 370.88 Sect/Pc #: 2/PCE 17
ROCK = PLAGIOCLASE MODERATELY PHYRIC BASALT
QUITE FRESH;
Texture: SUBOPHITIC*
Phenocrysts- PLAGIOCLASE ( 1-5%)
FRESH*
Groundmass - OLIVINE
Size(mm): 0.1-1.0
PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
MAGNETITE
Vesicles -
Size(mm): 0.5
Percent: 2
Filling: SMEC,CHLOROPH,
Filling: FE.HYDRX
Leg : 37 Top/Bottom Interval(mm): 1370/1400 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 377.50 Rock Type: IGNEOUS
Core: 35 Sample Midpoint(m) : 378.89 Sect/Pc #: 1/PCE 7A
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: VARIOLITIC,INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( >5%)
FRESH*
Groundmass - OLIVINE
Size(mm): 0.1-1.0
PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Size(mm): 0.5
Percent: 4
Filling: SMEC,CHLOROPH
SMEC NEXT TO WALL-THEN CHLOROPH*
Leg : 37 Top/Bottom Interval(mm): 610/ 690 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 387.00 Rock Type: IGNEOUS
Core: 36 Sample Midpoint(m) : 387.65 Sect/Pc #: 1/PCE 9
ROCK = PLAGIOCLASE PHYRIC BASALT
VERY FRESH ROCK WITH SOME CARBONATE;
Texture: INTERGRANULAR,SUBOPHITIC*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): 0.2-2.0
FRESH*
Groundmass - OLIVINE ( 0%)
NO OL SEEN (OL VISIBLE IN CORE);
PLAGIOCLASE
Size(mm): 0.15
PYROXENE
Size(mm): 0.15
WAVY EXTINCTION;
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE;
GLASS ( 1%)
DEVITRIFIED*
Vesicles -
Size(mm): 0.2
Percent: <1
Filling: CARB
Leg : 37 Top/Bottom Interval(mm): 300/ 400 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 387.00 Rock Type: IGNEOUS
Core: 36 Sample Midpoint(m) : 388.85 Sect/Pc #: 2/PCE 2
ROCK = PLAGIOCLASE SPARSELY PHYRIC BASALT;
Texture: INTERGRANULAR,INTERSERTAL*
Phenocrysts- PLAGIOCLASE
Size(mm): >0.5
FRESH AND ALTERED*
Groundmass - PLAGIOCLASE
PYROXENE
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE;
GLASS
ALTERED*
Alteration - SMECTITE
Replacing: GLASS
OPAQUE MINERALS
Replacing: GLASS
SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
HEMATITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Size(mm): >3.0
Percent: 10
Filling: SMEC,ZEOLITE
ID OF ZEOLITE UNCERTAIN,SMEC NEXT TO WALL-THEN
ZEOLITE(?)*
Leg : 37 Top/Bottom Interval(mm): 780/ 0 Describer: Fischer, J.
Hole: 332A Top of Core Depth(m) : 396.50 Rock Type: IGNEOUS
Core: 37 Sample Midpoint(m) : 397.28 Sect/Pc #: 1/PCE 1
ROCK = PLAG-CPX PHYRIC BASALT*
Texture: VARIOLITIC*
Phenocrysts- PLAGIOCLASE ( >5%)
Size(mm): >0.5
FRESH,A FEW HONEYCOMB PLAG XTLS WITH ALTERED GLASS
FILLINGS-RIMS OF HOLES(HONEYCOMB) ARE SAME
COMPOSITION AS THIN OUTER SODIC RIM OF XTLS;
CLINOPYROXENE
FRESH,2VZ 55-60*
Groundmass - PYROXENE ( 60%)
STRONGLY SWEEPING EXTINCTION IN PYX,MANY CHUNKS
(0.5MM) OF PLAG-PYX MICRO-GABBRO;
PLAGIOCLASE ( >10%)
HAS PRONOUNCED SWALLOWTAIL ENDS,PLAG + OL PRECEDE
VARIOLITIC FEATHERS;
OLIVINE ( 4%)
OL + PLAG PRECEDE VARIOLITIC FEATHERS;
GLASS
FRESH(5%) AND ALTERED(5%),INTERSTITIAL GLASS IS
FULL OF SKELETAL MAGNETITE,SOME IS DARK BROWN*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
THERE ARE SMALL PATCHES OF THE CLEAR YELLOW SMEC,
ONE SUCH PATCH IS VERY OBVIOUSLY REPLACING AN OL*
Vesicles -
Filling: SMEC,GLASS
GLASSY PARTIAL LININGS NEXT TO WALL-THEN SMEC*
Leg : 37 Top/Bottom Interval(mm): 1000/ 0 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 396.50 Rock Type: IGNEOUS
Core: 37 Sample Midpoint(m) : 397.50 Sect/Pc #: 1/PCE 4
ROCK = PLAGIOCLASE SPARSELY PHYRIC BASALT;
Texture: VARIOLITIC,INTERGRANULAR,SUBOPHITIC*
Phenocrysts- PLAGIOCLASE
Size(mm): >0.5
FRESH AND ALTERED*
Groundmass - OLIVINE
Size(mm): 0.1-1.0
PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE;
GLASS
ALTERED,BROWN*
Alteration - SMECTITE
Replacing: GLASS
CARBONATE
Location: GROUNDMASS Replacing: OL
Vesicles -
Size(mm): 1.0-2.0
Percent: 5
Filling: CARB
Leg : 37 Top/Bottom Interval(mm): 1160/1190 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 396.50 Rock Type: IGNEOUS
Core: 37 Sample Midpoint(m) : 397.68 Sect/Pc #: 1/PCE 6
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: SUBOPHITIC,INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( >5%)
Size(mm): >0.5
FRESH AND ALTERED,EFFECTS OF SLIGHT RESORPTION-
SOME PORPHYRY CLUSTERS PERMEATED BY UNIDENTIFIABLE
ALTERATION PRODUCTS,MOST PLAG UNALTERED IF ZONED*
Groundmass - PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.01-0.1
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE;
GLASS
ALTERED,YELLOW-BROWN*
Alteration - SMECTITE
Replacing: GLASS
CHLOROPHAEITE
Replacing: GLASS
ID UNCERTAIN*
Vesicles -
Size(mm): 1.0-2.0
Percent: 5-8
Filling: SMEC
Leg : 37 Top/Bottom Interval(mm): 1410/1440 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 396.50 Rock Type: IGNEOUS
Core: 37 Sample Midpoint(m) : 397.93 Sect/Pc #: 1/PCE 8
ROCK = PLAG-CPX-OL PHYRIC BASALT
FAIRLY COARSE GROUNDMASS,FLOW(?),INTRUSIVE(?);
Texture: SUBOPHITIC,INTERGRANULAR
OPHITIC TEX VERY MARKED (CPX TO PLAG)*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): >0.5
FRESH,SOMETIMES STRONGLY ZONED(NORMALLY),ALSO
SHOWING OVERGROWTHS + RESORPTION EFFECTS +
SAUSSURITIZATION,LARGE PLAG MAY INCLUDE EARLIER-
FORMED PLAG MICROPHENOS;
AUGITE ( <1%)
Size(mm): <0.5
FRESH;
OLIVINE ( <1%)
Size(mm): <0.5
FRESH*
Groundmass - OLIVINE
Size(mm): 0.1-1.0
PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
STRONG ZONING(HOURGLASS-TYPE?) IN SOME GROUNDMASS
AUGITES;
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE;
GLASS
ALTERED,BUFF-COLORED*
Alteration - ZEOLITE
Replacing: GLASS
MAGNETITE
Replacing: GLASS
PALAGONITE
Replacing: GLASS
ID UNCERTAIN;
SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS,GLASS
SILICA
Location: INTERSTITIAL Replacing: GROUNDMASS
SERICITE
Replacing: PLAG PHENOS
ID UNCERTAIN*
Vesicles -
Size(mm): TO 1.0
Percent: 2
Filling: CARB,ZEOLITE
Leg : 37 Top/Bottom Interval(mm): 1090/ 0 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 406.00 Rock Type: IGNEOUS
Core: 38 Sample Midpoint(m) : 407.09 Sect/Pc #: 1/PCE 1
ROCK = PLAGIOCLASE PHYRIC BASALT
VERY FRESH ROCK;
Texture: APHANITIC-CRYPTOCRYSTALLINE,VARIOLITIC*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): 0.6-1.0
Groundmass - OLIVINE
FRESH OL IN GROUNDMASS-GOOD FOR PROBE*
Leg : 37 Top/Bottom Interval(mm): 1300/1350 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 406.00 Rock Type: IGNEOUS
Core: 38 Sample Midpoint(m) : 407.33 Sect/Pc #: 1/PCE 4
ROCK = PLAG-CPX SPARSELY PHYRIC BASALT
QUENCHED ROCK,NO FRESH GLASS;
Texture: APHANITIC-CRYPTOCRYSTALLINE*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): TO 0.5
FRESH;
AUGITE ( <1%)
Size(mm): TO 0.5
FRESH,1 XTL*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Filling: SMEC,CHLOROPH
CHLOROPH ALTERS TO CLAY*
Leg : 37 Top/Bottom Interval(mm): 1430/ 0 Describer: Robinson, P.
Hole: 332A Top of Core Depth(m) : 406.00 Rock Type: IGNEOUS
Core: 38 Sample Midpoint(m) : 407.43 Sect/Pc #: 1/PCE 6
ROCK = PLAGIOCLASE PHYRIC BASALT;
Texture: INTERGRANULAR,INTERSERTAL
SLIGHTLY VARIOLITIC*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): TO 1.3 Morphology: EUHEDRAL
FRESH,APPROX COMP AN10,SOME GLOMEROPORPHYRITIC
CLUSTERS,XTLS OFTEN WITH PATCHY EXTINCTION,SOME
ZONING PARTICULARLY NEAR RIMS;
AUGITE ( TR%)
ROUNDED,2V 45,FRESH*
Groundmass - PYROXENE ( 50%)
SHEAVES OF CPX;
PLAGIOCLASE ( 40%)
Morphology: LATHS,SKELETAL
PLAG LATHS SKELETAL AND POORLY TERMINATED;
GLASS ( 5%)
FRESH AND ALTERED,SOME INTERSTITIAL BROWN GLASS
OPAQUE XTLS-PROBABLY MAGN;
OPAQUE MINERALS ( 3%)
INCLUDES MAGN + ILMENITE;
OLIVINE ( 2%)
Alteration - SILICA
Replacing: GLASS
ID UNCERTAIN;
SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS,GLASS
LARGELY AFTER GLASS*
Vesicles -
Size(mm): 0.2-0.5
Percent: 1
Filling: SMEC,FE.OXIDE
ID UNCERTAIN FOR FE.OXIDE*
Leg : 37 Top/Bottom Interval(mm): 390/ 410 Describer: Wright, T.
Hole: 332A Top of Core Depth(m) : 415.50 Rock Type: IGNEOUS
Core: 39 Sample Midpoint(m) : 415.90 Sect/Pc #: 1/PCE 6
ROCK = PLAG-CPX PHYRIC BASALT;
Texture: SUBOPHITIC,INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( 15%)
Size(mm): 0.2-1.0
FRESH;
AUGITE ( <1%)
FRESH*
Groundmass - GLASS
INTERSTITIAL GLASS-GOOD FOR PROBE,WITH APATITE(?),
FRESH-SOME DEVITRIFICATION;
PLAGIOCLASE
Size(mm): TO 0.4
PYROXENE
Size(mm): TO 0.4
WAVY EXTINCTION;
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE;
OLIVINE ( 0%)
NO OLIVINE SEEN*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
Vesicles -
Size(mm): <0.1
Percent: <1
Filling: SMEC
Leg : 37 Top/Bottom Interval(mm): 300/ 0 Describer: Robinson, P.
Hole: 332A Top of Core Depth(m) : 425.00 Rock Type: IGNEOUS
Core: 40 Sample Midpoint(m) : 425.30 Sect/Pc #: 1/PCE 3
ROCK = PLAG-CPX SPARSELY PHYRIC BASALT
FRAGMENTS OF PHYRIC BASALT WITH PLAG + CPX PHENOS
IN FINE-GRAINED MATRIX,FRAGMENTS TO 4.0MM-QUITE
FRESH,SOME FLOW STRUCTURE;
Texture: INTERGRANULAR,INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( <1%)
FRESH,XTLS OFTEN BROKEN-MAY BE XENOCRYSTS;
AUGITE ( TR%)
FRESH*
Groundmass - PLAGIOCLASE
PYROXENE
SOME ABUNDANT GROUNDMASS SMEC AFTER CPX;
OLIVINE ( 0%)
SOME GROUNDMASS SMEC MAY HAVE REPLACED THE
GROUNDMASS OL BUT THIS IS NOT OBVIOUS;
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE*
Alteration - SMECTITE
Location: VEINS
CARBONATE
Location: VEINS
SMECTITE
Location: INTERSTITIAL Replacing: GROUNDMASS
ABUNDANT GROUNDMASS SMEC AFTER INTERSTITIAL
MATERIAL AND SOME AFTER CPX,SOME MAY HAVE REPLACED
GROUNDMASS OL BUT THIS IS NOT OBVIOUS*
Vesicles -
Size(mm): 0.1
Percent: 1-2
Filling: SMEC,SILICA
ID FOR SILICA UNCERTAIN,SMEC NEXT TO WALL-THEN
SILICA,BROWN ZONES AROUND SOME VESICLE MARGINS
RICH IN ILMENITE(?),SOME VESICLE-SHAPED AREAS IN
WHICH GROUNDMASS IS FINER GRAINED AND DARKER THAN
SURROUNDING AREA-UP TO 5.0MM ACROSS*
Leg : 37 Top/Bottom Interval(mm): 950/ 0 Describer: Flower, M.
Hole: 332A Top of Core Depth(m) : 425.00 Rock Type: IGNEOUS
Core: 40 Sample Midpoint(m) : 427.45 Sect/Pc #: 2/
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: SUBOPHITIC,INTERGRANULAR,INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( >5%)
Size(mm): TO 4.0
ABUNDANT PHENOS,FRESH;
AUGITE ( 1-5%)
Size(mm): >0.5
ABUNDANT PHENOS,FRESH;
OLIVINE ( 1-5%)
Size(mm): TO 1.0
LESS ABUNDANT,FRESH*
Groundmass - OLIVINE
Size(mm): 0.1-1.0
PLAGIOCLASE
Size(mm): 0.1-1.0
PYROXENE
Size(mm): 0.1-1.0
GLASS
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE*
Alteration - SMECTITE
Replacing: CPX PHENOS
CARBONATE
Replacing: OL PHENOS
IDDINGSITE
Replacing: OL PHENOS
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