Leg : 55 Top/Bottom Interval(mm): 1100/1180 Describer: Kirkpatrick, J.
Hole: 430A Top of Core Depth(m) : 57.00 Rock Type: IGNEOUS
Core: 4 Sample Midpoint(m) : 59.64 Sect/Pc #: 2/
ROCK = APHYRIC BASALT
HAWAIITE, SOURCE IS IR, 22% ALTERED;
Texture: APHYRIC,SUBTRACHYTIC*
Groundmass - PLAGIOCLASE ( 57%)
Size(mm): .01-.95
CLINOPYROXENE ( 19%)
Size(mm): .005-.28
OLIVINE ( 13%)
Size(mm): .01-.40
COMPLETELY REPLACED BY IDDINGSITE AND SMECTITE;
MAGNETITE ( 5%)
Size(mm): .005-.40 Morphology: EQUANT
PARTLY REPLACED BY HEMATITE,EXSOLVED;
ILMENITE ( 4%)
Size(mm): .01-.50 Morphology: ELONGATE
APATITE ( 2%)
Size(mm): .01-.28
PYRITE
COMMON,CHALCOPYRITE PRESENT IN POOLS OF CLAY,
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - SMECTITE
Replacing: OL
IDDINGSITE
Replacing: OL
HEMATITE
Replacing: MAGN
Leg : 55 Top/Bottom Interval(mm): 1150/1160 Describer: Avdeiko, G.
Hole: 430A Top of Core Depth(m) : 57.00 Rock Type: IGNEOUS
Core: 4 Sample Midpoint(m) : 59.66 Sect/Pc #: 2/
ROCK = APHYRIC BASALT;
Texture: SUBTRACHYTIC,APHYRIC;
Where sampled: FLOW INTERIOR*
Groundmass - OLIVINE ( 1%)
Size(mm): 0.1-0.2
ALTERED TO HEMATITES AND CLAY.MINS;
PLAGIOCLASE ( 57%)
Size(mm): 0.3-0.8 Morphology: LONG LATHS
SIZE RANGE IS LENGTH,SLIGHTLY ALTERED TO CLAY.MIN;
CLINOPYROXENE ( <1%)
OPAQUE MINERALS ( 19%)
Size(mm): 0.1-0.8 Morphology: EQUANT,LONG LATHS
INCLUDES ILMENITE+MAGN,SOME LATHS ARE 0.9MM LONG,
TITAN.MT SHOWS EXSOLUTION TO ILMENITE+MAGN PLUS
ALTERATION TO UNKNOWN GREY PHASE;
GLASS ( 23%)
ALTERED BY CLAY.MINS*
Alteration - CLAY MINERALS ( 25%)
Replacing: GLASS,OL,PLAG
HEMATITE
Replacing: OL
Vesicles -
Percent: <1
Leg : 55 Top/Bottom Interval(mm): 50/ 70 Describer: Dalrymple, G.
Hole: 430A Top of Core Depth(m) : 66.50 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 66.56 Sect/Pc #: 1/PCE 1
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: SUBTRACHYTIC,SPARSELY PHYRIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 3 Morphology: SUBHEDRAL
COMPLETELY IDDINGSITIZED;
PLAGIOCLASE ( <1%)
Size(mm): 0.5-2 Morphology: ANHEDRAL
CORRODED,EMBAYED,UNZONED;
CLINOPYROXENE ( 0%)
SPINEL ( 0%)
Groundmass - OLIVINE ( 1%)
Size(mm): .05-.2 Morphology: SUBHEDRAL-ANHEDRAL
COMPLETELY IDDINGSITIZED;
PLAGIOCLASE (50-60%)
Size(mm): 0.05-0.5 Morphology: SUBHEDRAL,LATHS
CLINOPYROXENE ( 10%)
Size(mm): 0.01-0.2 Morphology: SUBOPHITIC
OPAQUE MINERALS ( 10%)
Size(mm): 0.02-0.2 Morphology: EUHEDRAL-SUBHEDRAL
INCLUDES ILMENITE+TITAN.MT+MAGN,TITAN.MT SHOWS
ABUNDANT EXSOLUTION TO ILMENITE+TITAN.MT, RARE
MAGN FILLS MINOR FRACTURES IN TITAN.MT;
QUARTZ ( 0%)
ALKALI FELDSPAR ( 0%)
APATITE ( 1%)
Size(mm): 0.1 Morphology: ACICULAR
0.1MM LONG*
Alteration - CLAY MINERALS ( 5-10%)
Replacing: OL,GLASS
Vesicles -
Percent: 0
Leg : 55 Top/Bottom Interval(mm): 160/ 190 Describer: Kirkpatrick, J.
Hole: 430A Top of Core Depth(m) : 66.50 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 66.68 Sect/Pc #: 1/PCE 2A
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: TRACHYTIC,SUBOPHITIC,SPARSELY PHYRIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.6 Morphology: TABULAR,SUBHEDRAL
Groundmass - OLIVINE ( 0%)
NONE VISIBLE, PROBABLY ALL ALTERED;
PLAGIOCLASE ( 45%)
Size(mm): 0.1-0.4 Morphology: TABULAR
CLINOPYROXENE ( 10%)
Size(mm): 0.1 Morphology: SKELETAL-SUBOPHITIC-ANHEDRAL
TITANOMAGNETITE ( 15%)
Size(mm): TO 0.2 Morphology: SKELETAL-ANHEDRAL
APATITE ( 2%)
Size(mm): TO 0.2 Morphology: ACICULAR
UP TO 0.2MM LONG*
Alteration - CARBONATE ( <1%)
Location: VESICLE
CLAY MINERALS ( 26%)
Location: BETWEEN PLAG Replacing: OL,GLASS
CLAY IS RED,GREEN,BROWN,UNSURE IF GLASS*
ZEOLITE
Location: VESICLES
ISOTROPIC*
Vesicles -
Filling: CARB,ZEOLITES
Leg : 55 Top/Bottom Interval(mm): 210/ 270 Describer: Kirkpatrick, J.
Hole: 430A Top of Core Depth(m) : 66.50 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 66.74 Sect/Pc #: 1/PCE 2A
ROCK = APHYRIC BASALT
HAWAIITE, SOURCE IS IR, 12% ALTERED;
Texture: APHYRIC,SUBTRACHYTIC,INTERSERTAL*
Groundmass - PLAGIOCLASE ( 62%)
Size(mm): .01-1.55
CLINOPYROXENE ( 16%)
Size(mm): .005-.50
OLIVINE ( 7%)
Size(mm): .01-.50
COMPLETELY REPLACED BY SMECTITE AND RARE CALCITE;
MAGNETITE ( 7%)
Size(mm): .005-.48 Morphology: EQUANT
EXSOLVED,MOST HAVE UNDERGONE LONG-TERM OXIDATION
AND ARE FLAT GRAY TO WHITE IN REFLECTING LIGHT;
ILMENITE ( 4%)
Size(mm): .01-.65 Morphology: ELONGATE
RARE;
APATITE ( 3%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - SMECTITE
Replacing: OL
CALCITE
Replacing: OL
RARE*
Leg : 55 Top/Bottom Interval(mm): 840/ 860 Describer: Dalrymple, G.
Hole: 430A Top of Core Depth(m) : 66.50 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 68.85 Sect/Pc #: 2/PCE 6
ROCK = PLAG SPARSELY MICROPHYRIC BASALT;
Texture: TRACHYTIC,SPARSELY MICROPHYRIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( 0%)
PLAGIOCLASE ( <1%)
Size(mm): 0.5-1
MICROPHENOCRYSTS;
CLINOPYROXENE ( 0%)
SPINEL ( 0%)
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 60%)
Size(mm): 0.05-0.5 Morphology: LATHS
FRESH,TWINNED;
CLINOPYROXENE (10-15%)
Size(mm): 0.5-0.2 Morphology: OPHITIC
FRESH, 2V45-50,(+);
OPAQUE MINERALS ( 5%)
Size(mm): 0.005-0.1 Morphology: EUHEDRAL-ANHEDRAL
INCLUDES TITAN.MT+MAGN+ILMENITE, RARE TITAN.MT
EXSOLVING TO ILMENITE+MAGN;
GLASS ( 0%)
ORTHOPYROXENE ( 0%)
QUARTZ ( 0%)
ALKALI FELDSPAR ( 0%)
APATITE ( <1%)
Size(mm): 0.02 Morphology: EUHEDRAL XTLS
Alteration - CLAY MINERALS (15-20%)
Location: INTERGRANULAR Replacing: OL,GLASS
Location: BETWN PLAG
ID UNCERTAIN FOR GLASS*
Vesicles -
Percent: 0
Leg : 55 Top/Bottom Interval(mm): 850/ 860 Describer: Kirkpatrick, J.
Hole: 430A Top of Core Depth(m) : 66.50 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 68.86 Sect/Pc #: 2/
ROCK = OL SPARSELY PHYRIC BASALT
HAWAIITE, SOURCE IS IR, 25% ALTERED;
Texture: SPARSELY PHYRIC,SUBTRACHYTIC,INTERSERTAL*
Phenocrysts- OLIVINE ( <1%)
Size(mm): .53
Groundmass - PLAGIOCLASE ( 63%)
Size(mm): .02-.55
CLINOPYROXENE ( 16%)
Size(mm): .005-.50
OLIVINE ( 11%)
Size(mm): .02-.50
NEARLY ALL REPLACED BY SMECTITE;
ILMENITE ( 5%)
Size(mm): .02-.50
APATITE ( 3%)
Size(mm): UP TO .50
MAGNETITE ( 2%)
Size(mm): .005-.008
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - SMECTITE
Replacing: OL
Leg : 55 Top/Bottom Interval(mm): 1020/1150 Describer: Kirkpatrick, J.
Hole: 430A Top of Core Depth(m) : 66.50 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 69.09 Sect/Pc #: 2/PCE 6B
ROCK = PLAG SPARSELY PHYRIC BASALT
HAWAIITE, SOURCE IS IR, 21% ALTERED;
Texture: SPARSELY PHYRIC,SUBTRACHYTIC,INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 1.35
Groundmass - PLAGIOCLASE ( 60%)
Size(mm): .05-.60
CLINOPYROXENE ( 20%)
Size(mm): .04-.50
OLIVINE ( 10%)
Size(mm): .05-.48
NEARLY ALL REPLACED BY IDDINGSITE AND SMECTITE;
MAGNETITE ( 6%)
Size(mm): .02-.40
TITANO-MAGN HAS ILMENITE EXSOLUTION LAMELLAE;
ILMENITE ( 2%)
Size(mm): .04-.49
APATITE ( 1%)
Size(mm): .05-.07
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - IDDINGSITE
Replacing: OL
SMECTITE
Replacing: OL
Leg : 55 Top/Bottom Interval(mm): 1200/1230 Describer: Clague, D.
Hole: 430A Top of Core Depth(m) : 66.50 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 69.22 Sect/Pc #: 2/PCE 6C
ROCK = PLAG-OL-TITAN.MT SPARSELY PHYRIC BASALT;
Texture: SUBTRACHYTIC,SPARSELY PHYRIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 0.6
POSSIBLY FORSTERITE,CORE OF XTL IS FRESH;
PLAGIOCLASE ( <1%)
Size(mm): 1.3 Morphology: EMBAYED
APPROX COMP AN55 BY C/A METHOD, RIM MORE SODIC;
TITANOMAGNETITE ( <1%)
Size(mm): 0.8 Morphology: EUHEDRAL
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 65%)
Size(mm): 0.2
APPROX COMP AN30,NEARLY PARALLEL EXTINCTION;
CLINOPYROXENE ( 12%)
Size(mm): 0.9 Morphology: OPHITIC
VERY PALE BROWN;
COMBINATION ( 7%)
Size(mm): 0.05-0.10
INCLUDES MAGN+ILMENITE+GLASS+TITAN.MT, TITAN.MT IS
HOMOGENEOUS;
APATITE ( 1%)
Alteration - CLAY MINERALS ( 15%)
Location: INTERSTITIAL Replacing: GLASS
Vesicles -
Percent: 0
Leg : 55 Top/Bottom Interval(mm): 620/ 650 Describer: Dalrymple, G.
Hole: 430A Top of Core Depth(m) : 66.50 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 71.64 Sect/Pc #: 4/PCE 7
ROCK = APHYRIC BASALT
NO PHENOCRYSTS SEEN IN THE THIN SECTION;
Texture: TRACHYTIC,APHYRIC;
Where sampled: NEAR TOP
UNCERTAIN WHERE SAMPLED,VESICULAR*
Groundmass - OLIVINE ( 2-3%)
Size(mm): 0.01-0.4 Morphology: IRREGULAR
ALTERED TO IDDINGSITE;
PLAGIOCLASE ( 50%)
Size(mm): 0.05-0.4 Morphology: LATHS
FRESH;
CLINOPYROXENE ( 5%)
Size(mm): 0.1 Morphology: GRANULAR
OPAQUE MINERALS ( 5%)
Size(mm): 0.05-0.2 Morphology: SUBHEDRAL
INCLUDES MAGN+ILMENITE+UNKNOWN GREY PHASE, SOME
TITAN.MT EXSOLUTION;
GLASS ( 20%)
Morphology: INTERGRANULAR
DEVITRIFIED;
ORTHOPYROXENE ( 0%)
QUARTZ ( 0%)
ALKALI FELDSPAR ( 0%)
APATITE ( 1%)
Alteration - CLAY MINERALS ( 5-10%)
Replacing: GLASS
Vesicles -
Size(mm): 0.5-10
Percent: 20-25
Location: PERVASIVE
Filling: CALCITE
Shape: IRREGULAR,
Shape: FLATTENED
FEW ARE FILLED WITH CALCITE,SOME ARE LINED WITH
GLASS*
Leg : 55 Top/Bottom Interval(mm): 1260/1280 Describer: Clague, D.
Hole: 430A Top of Core Depth(m) : 66.50 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 73.77 Sect/Pc #: 5/PCE 10D
ROCK = PLAG-TITAN.MT SPARSELY PHYRIC BASALT;
Texture: SUBTRACHYTIC,SPARSELY PHYRIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 1.8
SINGLE BROKEN XTL,RESORBED,HAS THIN SODIC RIM;
TITANOMAGNETITE ( <1%)
Size(mm): 0.3 Morphology: EUHEDRAL
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 60%)
Size(mm): 0.1-0.2 Morphology: LONG LATHS
PLAG IS FUZZY WITH CLAY.MIN ALTERATIONS;
CLINOPYROXENE ( 10%)
Size(mm): 0.1 Morphology: GRANULAR-SUBOPHITIC
OPAQUE MINERALS ( 5%)
Size(mm): 0.05
INCLUDES TITAN.MT+MAGN+ILMENITE, TITAN.MT WITH
ABUNDANT EXSOLUTION TO MAGN+ILMENITE OR
TITAN.MT+ILMENITE;
GLASS ( 2%)
APATITE ( 1%)
Size(mm): 0.1 Morphology: ACICULAR
0.1MM LONG NEEDLES*
Alteration - CLAY MINERALS ( 20%)
Location: INTERSTITIAL Replacing: GLASS
Vesicles -
Size(mm): 3
Percent: 1
Filling: CALCITE,
Shape: ROUND
Filling: CLAY.MIN
Leg : 55 Top/Bottom Interval(mm): 170/ 250 Describer: Kirkpatrick, J.
Hole: 430A Top of Core Depth(m) : 76.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 76.21 Sect/Pc #: 1/PCE 2A
ROCK = APHYRIC BASALT
HAWAIITE, SOURCE IS IR, 19% ALTERED;
Texture: APHYRIC,SUBTRACHYTIC*
Groundmass - PLAGIOCLASE ( 61%)
Size(mm): .10-.70
CLINOPYROXENE ( 23%)
Size(mm): .05-.30
OLIVINE ( 10%)
Size(mm): .04-.49
NEARLY ALL OL REPLACED BY IDDINGSITE AND SMECTITE
AND CALCITE;
MAGNETITE ( 5%)
Size(mm): .05-.30 Morphology: EQUANT
EXSOLVED;
APATITE ( <1%)
Size(mm): TO .10
ILMENITE ( 1%)
Size(mm): .02-.33 Morphology: ELONGATE
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - IDDINGSITE
Replacing: OL
SMECTITE
Replacing: OL
CALCITE
Replacing: OL
Leg : 55 Top/Bottom Interval(mm): 330/ 350 Describer: Clague, D.
Hole: 430A Top of Core Depth(m) : 76.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 76.34 Sect/Pc #: 1/PCE 2B
ROCK = APHYRIC BASALT;
Texture: SUBTRACHYTIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- TITANOMAGNETITE ( <1%)
Size(mm): 0.70 Morphology: SUBHEDRAL
ONLY 2 GRAINS*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 60%)
Size(mm): 0.15 Morphology: LONG LATHS
PLAG IS FRESH;
CLINOPYROXENE ( 15%)
Size(mm): 0.3 Morphology: OPHITIC
OPHITIC AROUND PLAG,SIZE IS FOR OPHITIC PLATE;
OPAQUE MINERALS ( 5%)
Size(mm): 0.05
INCLUDES TITAN.MT+ILMENITE, VERY RARE TITAN.MT
EXSOLUTION TO ILMENITE+TITAN.MT;
APATITE
Morphology: HEXAGONAL,ACICULAR
STUMPY HEXAGONAL XTLS AND ACICULAR NEEDLES*
Alteration - CLAY MINERALS ( 20%)
Location: INTERSTITIAL Replacing: GLASS
ZEOLITE ( 2%)
Replacing: OL
GREEN SAPONITE*
Vesicles -
Percent: 0
Leg : 55 Top/Bottom Interval(mm): 630/ 660 Describer: Kirkpatrick, J.
Hole: 430A Top of Core Depth(m) : 76.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 76.64 Sect/Pc #: 1/
ROCK = PLAG-OL SPARSELY PHYRIC BASALT
HAWAIITE, SOURCE IS IR, 25% ALTERED;
Texture: SPARSELY PHYRIC,SUBTRACHYTIC,INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): .83
OLIVINE ( <1%)
Size(mm): .55
Groundmass - PLAGIOCLASE ( 54%)
Size(mm): .005-.50
CLINOPYROXENE ( 18%)
Size(mm): .006-.50
OLIVINE ( 12%)
Size(mm): .008-.50
COMPLETELY REPLACED BY IDDINGSITE AND SMECTITE;
MAGNETITE ( 8%)
Size(mm): .001-.20
RIMS ALTERED TO HEMATITE;
APATITE ( 5%)
Size(mm): .006-.30
ILMENITE ( 3%)
Size(mm): .005-.41
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - IDDINGSITE
Replacing: OL
SMECTITE
Replacing: OL
Leg : 55 Top/Bottom Interval(mm): 1020/1050 Describer: Avdeiko, G.
Hole: 430A Top of Core Depth(m) : 76.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 77.04 Sect/Pc #: 1/PCE 10
ROCK = APHYRIC BASALT;
Texture: MICRODIABASIC,APHYRIC;
Where sampled: FLOW INTERIOR*
Groundmass - OLIVINE ( 3%)
Size(mm): 0.1-0.2 Morphology: EQUANT
ALTERED TO CLAY.MIN OR HEMATITE;
PLAGIOCLASE ( 58%)
Size(mm): TO 0.7 Morphology: LATHS
20-25% ALTERED TO CLAYS;
CLINOPYROXENE ( 2%)
Size(mm): 0.1-0.2
OPAQUE MINERALS ( 9%)
Size(mm): 0.1-0.2 Morphology: EQUANT,LATHS
INCLUDES TITAN.MT+MAGN+ILMENITE,LATH SIZE TO 0.5MM
SOME TITAN.MT HAVE ILMENITE CORES, SOME EXSOLVED
TO TITAN.MT+MAGN,THERE IS SOME ALTERATION TO A
DARK GREY PHASE;
APATITE ( <1%)
Size(mm): 0.02-0.03
Alteration - CLAY MINERALS (40-45%)
Replacing: GLASS,OL,PLAG
PARTIALLY REPLACING PLAG;
HEMATITE ( TR%)
Replacing: OL
Vesicles -
Percent: 0
Leg : 55 Top/Bottom Interval(mm): 1340/1360 Describer: Kirkpatrick, J.
Hole: 430A Top of Core Depth(m) : 76.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 78.85 Sect/Pc #: 2/PCE 13
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: SUBOPHITIC-TRACHYTIC,HOLOCRYSTALLINE,SPARSELY
Piece #: IC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.4 Morphology: TABULAR
Groundmass - OLIVINE ( <<1%)
Size(mm): 0.05 Morphology: ANHEDRAL
REMNANTS AFTER ALTERATION;
PLAGIOCLASE ( 60%)
Size(mm): 0.4 Morphology: TABULAR,VARIOLITIC
CLINOPYROXENE ( 5%)
Size(mm): 0.1-0.2 Morphology: ANHEDRAL-SKELETAL
TITANOMAGNETITE ( 5%)
Size(mm): 0.1-0.4 Morphology: EUHEDRAL-ELONGATED
MOST ARE 0.1MM LONG, SOME SKELETAL ABUNDANT
EXSOLUTION TO MAGN+ILMENITE, SOME ALTERING TO
UNKNOWN GRAY PHASE;
APATITE ( 2%)
Size(mm): 0.05 Morphology: ACICULAR
Alteration - CLAY MINERALS ( 26%)
Replacing: OL,GLASS
POSSIBLY GLASS,CLAY IS BROWN+GREEN-BROWN;
HEMATITE ( 1%)
Replacing: OP.MINS,OL
RED ALTERATION PRODUCT,VERY UNSURE THAT IT IS
HEMATITE*
Leg : 55 Top/Bottom Interval(mm): 520/ 630 Describer: Kirkpatrick, J.
Hole: 430A Top of Core Depth(m) : 76.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 79.58 Sect/Pc #: 3/PCE 5
ROCK = APHYRIC BASALT
HAWAIITE, SOURCE IS IR, 15% ALTERED;
Texture: APHYRIC,SUBTRACHYTIC*
Groundmass - PLAGIOCLASE ( 64%)
Size(mm): .007-.75
CLINOPYROXENE ( 22%)
Size(mm): .008-.10
TITANOMAGNETITE ( 5%)
Size(mm): .01-.09 Morphology: EQUANT
EXSOLVED;
OLIVINE ( 4%)
Size(mm): .03-.50
COMPLETELY REPLACED BY SMECTITE;
ILMENITE ( 3%)
Size(mm): .18-.40 Morphology: ELONGATE
APATITE ( 1%)
Size(mm): .007-.01
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - SMECTITE
Replacing: OL
Leg : 55 Top/Bottom Interval(mm): 680/ 700 Describer: Kirkpatrick, J.
Hole: 430A Top of Core Depth(m) : 76.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 79.69 Sect/Pc #: 3/PCE 6
ROCK = APHYRIC BASALT;
Texture: HOLOCRYSTALLINE,TRACHYTIC,SUBOPHITIC,APHYRIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 0.7 Morphology: ANHEDRAL
PROBABLY RESORBED*
Groundmass - OLIVINE ( <1%)
Size(mm): 0.05 Morphology: ANHEDRAL
PLAGIOCLASE ( 50%)
Size(mm): 0.1-0.3 Morphology: TABULAR
PARALLEL ORIENTATION;
CLINOPYROXENE ( 15%)
Size(mm): TO 0.1 Morphology: SKELETAL
AUGITE, PARALLEL PLAG LATHS;
OPAQUE MINERALS ( 10%)
Size(mm): 0.1 Morphology: SKELETAL,EQUANT-ELONGATED
INCLUDES TITAN.MT+MAGN, TITAN.MT+MAGN GOES TO
TITAN.MT POSSIBLY EXSOLVING MAGN;
APATITE ( 2%)
Size(mm): TO 0.2 Morphology: ACICULAR
Alteration - CLAY MINERALS ( 28%)
Replacing: OL,GLASS
PERHAPS GLASS,CLAY IS GREEN+BROWN+GREEN-BROWN;
HEMATITE ( <1%)
Location: NEAR OP.MINS Replacing: OP.MINS
UNSURE IF HEMATITE,UNSURE IF OP.MINS ARE BEING
REPLACED,POSSIBLY ALT.PRODUCT IS RUTILE*
Vesicles -
Size(mm): .5
Percent: <1
Filling: EMPTY
Shape: ROUND
Leg : 55 Top/Bottom Interval(mm): 00/ 10 Describer: Clague, D.
Hole: 430A Top of Core Depth(m) : 76.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 80.51 Sect/Pc #: 4/PCE 1A
ROCK = PLAG-TITAN.MT SPARSELY PHYRIC BASALT;
Texture: PILOTAXITIC-SUBTRACHYTIC,SPARSELY PHYRIC;
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 0.7 Morphology: EUHEDRAL
SODIC RIM SURROUNDS IRREGULAR RESORBED CORE;
TITANOMAGNETITE ( <1%)
CLUSTER OF SMALL XTLS*
Groundmass - OLIVINE ( 5%)
Size(mm): 0.05
FRESH CORES INSIDE ALTERED RIMS;
PLAGIOCLASE ( 59%)
Size(mm): 0.10 Morphology: LATHS
PLAG IS BEGINNING TO ALTER TO CLAY.MINS;
CLINOPYROXENE ( 10%)
Size(mm): 0.05
OPAQUE MINERALS ( 5%)
Size(mm): 0.05
INCLUDES TITAN.MT+ILMENITE, TITAN.MT WITH SOME
ILMENITE EXSOLUTION;
APATITE ( 1%)
Morphology: ACICULAR
Alteration - CLAY MINERALS ( 20%)
Location: INTERSTITIAL Replacing: GLASS,OL
TOTALLY REPLACES MOST GRAINS, ONLY REPLACES RIMS
ON SOME*
Vesicles -
Percent: 0
Leg : 55 Top/Bottom Interval(mm): 70/ 150 Describer: Kirkpatrick, J.
Hole: 430A Top of Core Depth(m) : 76.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 80.61 Sect/Pc #: 4/PCE 5
ROCK = APHYRIC BASALT
HAWAIITE, SOURCE IS IR, 28% ALTERED;
Texture: APHYRIC,SUBTRACHYTIC*
Groundmass - PLAGIOCLASE ( 63%)
Size(mm): .01-.90
CLINOPYROXENE ( 17%)
Size(mm): .006-.20
OLIVINE ( 12%)
Size(mm): .01-.64
85% OF OL REPLACED BY IDDINGSITE AND SMECTITE;
TITANOMAGNETITE ( 4%)
Size(mm): .004-.20
PARTLY REPLACED;
ILMENITE ( 4%)
Size(mm): .005-.30
APATITE ( <1%)
Size(mm): TO .08
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - IDDINGSITE
Replacing: OL
SMECTITE
Replacing: OL
Leg : 55 Top/Bottom Interval(mm): 1400/1500 Describer: Kirkpatrick, J.
Hole: 430A Top of Core Depth(m) : 76.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 81.95 Sect/Pc #: 4/PCE 18
ROCK = PLAG-CPX-OL PHYRIC BASALT
PLAG THOLEIITE, SOURCE IS IR, 5% ALTERED;
Texture: GLOMEROPHYRIC,INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( 17%)
Size(mm): 1.47
STRONGLY ZONED AND CONTAIN GLASS INCLUSIONS;
CLINOPYROXENE ( 2%)
Size(mm): 1.33
OLIVINE ( 1%)
Size(mm): 1.22
Groundmass - PLAGIOCLASE ( 42%)
Size(mm): .25-.50
CLINOPYROXENE ( 32%)
Size(mm): .006-.40
TITANOMAGNETITE ( 2%)
Size(mm): .005-.08
ILMENITE ( 2%)
Size(mm): .008-.10
OLIVINE ( 2%)
Size(mm): .01-.50
COMPLETELY REPLACED BY IDDINGSITE AND SMECTITE;
PYRITE
RARE PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - IDDINGSITE
Replacing: OL
SMECTITE
Replacing: OL
Leg : 55 Top/Bottom Interval(mm): 280/ 300 Describer: Dalrymple, G.
Hole: 430A Top of Core Depth(m) : 114.00 Rock Type: IGNEOUS
Core: 10 Sample Midpoint(m) : 114.29 Sect/Pc #: CC/
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: TRACHYTIC,SPARSELY PHYRIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 1.5-0.5 Morphology: IRREGULAR LATHS
Groundmass - OLIVINE ( 1-2%)
Size(mm): 0.01-0.05 Morphology: GRANULAR
CLAY.MIN+IDDINGS AROUND RIMS;
PLAGIOCLASE ( 50%)
Size(mm): 0.05-0.5 Morphology: LATHS
BEGINNING TO ALTER ALONG FRACTURES;
OPAQUE MINERALS ( 5%)
Size(mm): 0.005-0.15
INCLUDES TI.MAGN+ILMENITE, RARE TI.MAGN EXSOLUTION
TO PALE+DARK PINK BROWN PHASES;
GLASS ( 0%)
ORTHOPYROXENE ( 0%)
QUARTZ ( 0%)
ALKALI FELDSPAR ( 0%)
APATITE ( 1-2%)
Size(mm): .001-.005 Morphology: ACICULAR,EUHEDRAL
Alteration - CLAY MINERALS (15-20%)
Replacing: OL,GLASS
LOCATED BETW PLAG LATHS AND IRREGULAR BLOBS,
UNSURE IF GLASS IS BEING REPLACED*
Vesicles -
Percent: 0
Leg : 55 Top/Bottom Interval(mm): 0/ 0 Describer: Clague, D.
Hole: 430A Top of Core Depth(m) : 117.00 Rock Type: IGNEOUS
Core: 11 Sample Midpoint(m) : 117.10 Sect/Pc #: CC/PCE 1
ROCK = APHYRIC BASALT
NO PHENOCRYSTS WERE OBSERVED IN THIN SECTION;
Texture: PILOTAXITIC-MICRODIABASIC,APHYRIC*
Groundmass - OLIVINE ( 5%)
Size(mm): 0.02-0.05 Morphology: EUHEDRAL
APPROX COMP FO65,2V80 (-),ALTERED ON RIMS;
PLAGIOCLASE ( 50%)
Size(mm): 0.05-0.5 Morphology: LATHS,IRREGULAR
SOME ALIGNMENT BY FLOW;
CLINOPYROXENE ( 15%)
Size(mm): 0.05-0.2 Morphology: GRANULAR
OPAQUE MINERALS ( 5%)
Size(mm): 0.005-0.1 Morphology: EQUANT,LATHS
INCLUDES TITAN.MT+MAGN+ILMENITE, TITAN.MT RARELY
EXSOLVING TO MAGN+ILMENITE;
GLASS ( 0%)
ORTHOPYROXENE ( 0%)
QUARTZ ( 0%)
ALKALI FELDSPAR ( 0%)
APATITE ( 1-2%)
Size(mm): <0.2 Morphology: ACICULAR,EUHEDRAL
Alteration - CLAY MINERALS ( 25%)
Location: RIMS ON OL, Replacing: OL,PLAG
Location: INTERSTITIAL
Vesicles -
Percent: 0
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