Leg : 30 Top/Bottom Interval(mm): 800/ 840 Describer: Stoeser, D.
Hole: 289 Top of Core Depth(m) : 1259.50 Rock Type: IGNEOUS
Core: 132 Sample Midpoint(m) : 1261.82 Sect/Pc #: 2/PCE 1
ROCK = FEL-OL MODERATELY MICROPHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,VARIOLITIC
PERFECT VARIOLITIC TEXTURE*
Phenocrysts- FELDSPAR ( 2%)
Size(mm): <0.5 Morphology: EUHEDRAL
ALKALI FELDSPAR OR AN ALTERATION OF ORIGINAL PLAG,
THIN 1 MICRON OUTER ZONE,SOMETIMES PARTLY OR
COMPLETELY REPLACED BY SINGLE XTL CALCITE,CARLSBAD
TWINNING,ODD PATCHY EXTINCTION,2V 20;
OLIVINE ( <1%)
REPLACED BY IDDINGSITE + CHLORITE*
Groundmass - PYROXENE
Size(mm): <0.25
INTERLOCKING MOSAIC OF PYX VARIOLITES,<0.25 MM IN
DIAMETER;
PLAGIOCLASE ( 10%)
Size(mm): TO 0.3 Morphology: HOLLOW
AVERAGE SIZE IS 0.10-0.15 MM,APPARENTLY PLAG STILL
IN PROCESS OF CRYSTALLIZING*
Alteration - CALCITE
Replacing: FEL PHENOS
FEL SOMETIMES PARTLY OR COMPLETELY REPLACED BY
SINGLE XTL CALCITE;
IDDINGSITE
Replacing: OL
CHLORITE
Location: GROUNDMASS Replacing: OL
SMALL AMOUNT OF CHLORITE IN THE GROUNDMASS*
Leg : 30 Top/Bottom Interval(mm): 880/ 910 Describer: Stoeser, D.
Hole: 289 Top of Core Depth(m) : 1259.50 Rock Type: IGNEOUS
Core: 132 Sample Midpoint(m) : 1261.90 Sect/Pc #: 2/PCE 1
ROCK = FEL-OL MODERATELY MICROPHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,VARIOLITIC-INTERGRANULAR;
TRANSITIONAL VARIOLITIC-INTERGRANULAR*
Phenocrysts- FELDSPAR ( 2%)
Size(mm): <0.5 Morphology: EUHEDRAL
ALKALI FELDSPAR OR AN ALTERATION OF ORIGINAL PLAG,
THIN 1 MICRON OUTER ZONE,SOMETIMES PARTLY OR
COMPLETELY REPLACED BY SINGLE XTL CALCITE,CARLSBAD
TWINNING,ODD PATCHY EXTINCTION,2V 20;
OLIVINE ( <1%)
REPLACED BY IDDINGSITE + CHLORITE*
Groundmass - PYROXENE
Morphology: BUNDLES
VERY FINE PYX IN BUNDLES;
PLAGIOCLASE
Size(mm): 0.2-0.3 Morphology: ACICULAR,HOLLOW
AVERAGE SIZE IS 0.2-0.3 MM;
MAGNETITE
QUENCH;
GLASS
ABUNDANT CHLORITE IN GROUNDMASS APPARENTLY
REPLACES GLASS*
Alteration - CHLORITE
Location: VEIN, Replacing: OL,GLASS
Location: GROUNDMASS
ONE LARGE CHLORITE VEIN WITH COLIFORM TEXTURE,
ABUNDANT CHLORITE IN GROUNDMASS - APPARENTLY
REPLACING GLASS;
CALCITE
Replacing: FEL PHENOS
FEL SOMETIMES PARTLY OR COMPLETELY REPLACED BY
SINGLE XTL CALCITE;
IDDINGSITE
Replacing: OL
Leg : 30 Top/Bottom Interval(mm): 1460/1480 Describer: Stoeser, D.
Hole: 289 Top of Core Depth(m) : 1259.50 Rock Type: IGNEOUS
Core: 132 Sample Midpoint(m) : 1262.47 Sect/Pc #: 2/PCE 9
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): <1
NORMALLY ZONED*
Groundmass - PLAGIOCLASE
Size(mm): .3 Morphology: HOLLOW LATHS
PYROXENE
Morphology: SHEAF-LIKE BUNDLES
MAGNETITE
Morphology: EUHEDRAL-STRINGS
Alteration - CHLORITE
Location: VEINS,
Location: GROUNDMASS
ID UNCERTAIN FOR CHLORITE,BRIGHT GREEN-SOME PALE
YELLOWISH GREEN CHLORITE IN GROUNDMASS,PLEOCHROIC
GREEN TO YELLOW-GREEN,OCCURS IN VEINS AND ALSO AS
SINGLE XTLS IN GROUNDMASS UP TO 4MM AWAY FROM
VEIN;
CALCITE
Location: VEINS
HEMATITE
Location: VEINS
ID UNCERTAIN FOR HEMATITE-RED MINERAL*
Leg : 30 Top/Bottom Interval(mm): 1470/1500 Describer: Stoeser, D.
Hole: 289 Top of Core Depth(m) : 1259.50 Rock Type: IGNEOUS
Core: 132 Sample Midpoint(m) : 1263.99 Sect/Pc #: 3/
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,VARIOLITIC-INTERSTITIAL
VARIOLITIC WITH INTERSTITIAL GLASS*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): .1 Morphology: MICROPHENOS
APPROX COMP AN68-74,VISUAL ESTIMATES OF ALL
PERCENTAGES,2V 85-90,NEGATIVE OPTIC SIGN;
OLIVINE ( 0%)
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): .3-.4 Morphology: MICROLITES
OFTEN HOLLOW WITH RECTANGULAR X-SECTIONS+LONG
SECTIONS;
PYROXENE ( 41%)
Morphology: BUNDLES
TOO FINE-GRAINED FOR 2V DETERMINATION;
MAGNETITE ( 7%)
Morphology: EUHEDRAL-SPEAR POINTS
GLASS ( 7%)
SOME FRESH,SOME CHLORITIZED*
Alteration - CHLORITE
BRIGHT GREEN,NON-PLEOCHROIC*
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