Leg : 33 Top/Bottom Interval(mm): 1415/1435 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 987.00 Rock Type: IGNEOUS
Core: 30 Sample Midpoint(m) : 989.92 Sect/Pc #: 2/
ROCK = PLAG-AUGITE-OL PHYRIC BASALT
SOURCE IS IR FOR ALL SITE 315A THIN SECTIONS,
HEAVILY ALTERED;
Texture: VARIOLITIC,PHYRIC*
Phenocrysts- PLAGIOCLASE ( 27.5%)
Size(mm): .4X1.5
AUGITE ( 10.0%)
Size(mm): .5
OLIVINE ( <1%)
Size(mm): .5
Groundmass - MAGNETITE ( 2-3%)
Size(mm): .05 Morphology: EUHEDRAL
ABUNDANT TINY MAGN GRAINS PRESENT AS INCLUSIONS IN
PLAG MICROPHENOS AND ALONG THEIR BOUNDARIES*
GROUNDMASS ( 61.0%)
Size(mm): <.2
ALL GROUNDMASS SIZES ARE AVERAGES,ALL PERCENTAGES
OBTAINED BY POINT COUNTS(AVERAGE COUNTED=300)*
Alteration - MONTMORILLONITE
Location: VESICLES Replacing: PLAG,AUGITE,GLASS
PLAG 15-20% ALTERED TO MONTMORILLONITE,AUGITE
(PROBABLY ONCE APPROX 30% OF ROCK)ALMOST ENTIRELY
ALTERED TO GREEN MONTMORILLONITE,GROUNDMASS
APPEARS TO HAVE BEEN GLASS,NOW ENTIRELY ALTERED TO
BROWN MONTMORILLONITE;
IDDINGSITE ( <1%)
Location: .5
<1% IDDINGSITE GRAINS SUGGESTS THE FORMER PRESENCE
OF VERY MINOR AMOUNTS OF OL,STAINED SECTIONS AND
X-RAY DATA SHOW NO NEPHELINE OR K-FELDSPAR*
Vesicles -
Size(mm): .1-1
Percent: 1.5
Filling: MONT+CALCITE
PARTLY TO WHOLLY FILLED-THESE HAVE GREEN
MONTMORILLONITE RIMS AND CALCITE INTERIORS,AVERAGE
SIZE .5MM*
Leg : 33 Top/Bottom Interval(mm): 1135/1150 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 996.50 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 997.64 Sect/Pc #: 1/
ROCK = PLAG-AUGITE-OL PHYRIC BASALT;
Texture: VARIOLITIC,PHYRIC*
Phenocrysts- PLAGIOCLASE ( 34.0%)
Size(mm): 1X3
AUGITE ( 12.5%)
Size(mm): 1
COARSER AND SLIGHTLY FRESHER VARIANT OF 30-2-
141.5-143.5 AUGITE,AND SHAPES ARE BETTER
PRESERVED;
OLIVINE ( <1%)
Groundmass - ILMENITE
Morphology: MICROLITES
MAGNETITE
Size(mm): UP TO .25
SAME DISTRIBUTION AS 30-2-141.5-143.5 BUT COARSER,
X-RAY SHOWS MINOR AMOUNTS OF PYRITE AND ANATASE*
GROUNDMASS ( 61.0%)
Size(mm): <.2
DISTRIBUTION OF ILMENITE MICROLITES SUGGESTS ROCK
CONSISTED OF APPROX 10% GLASS,NOW ALTERED*
Vesicles -
Size(mm): .1-1
Percent: 2.5
AVERAGE SIZE .5MM*
Leg : 33 Top/Bottom Interval(mm): 1155/1175 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 996.50 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 997.67 Sect/Pc #: 1/
ROCK = PLAG-AUGITE-OL PHYRIC BASALT
IDENTICAL TO 31-1-113-115,POLISHED SECTION SHOWS
NO CHROMITE,EUHEDRAL AND SKELETAL MAGN WITHOUT
ILMENITE INTERGROWTHS OCCURS,ELONGATE SKELETAL
ILMENITE PARTLY ALTERED TO ANATASE,A VERY SMALL
AMOUNT OF CHALCOPYRITE THROUGH ROCK*
Leg : 33 Top/Bottom Interval(mm): 0/ 0 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 996.50 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 998.10 Sect/Pc #: CC/
ROCK = PLAG-AUGITE-OL PHYRIC BASALT
APPEARS IDENTICAL TO 30-2-141.5-143.5,CONSIDERABLY
FINER GRAINED THAN 31-1-113-115 AND 115.5-117.5;
Texture: VARIOLITIC,PHYRIC*
Phenocrysts- PLAGIOCLASE ( 27.0%)
Size(mm): .4X1.5
AUGITE ( 10.0%)
Size(mm): .5
OLIVINE ( <1%)
Groundmass - GROUNDMASS ( 61.0%)
Size(mm): <.2
SAME AS 30-2-141.5-143.5 BUT LACKS ALTERED OL
IN AVAILABLE SECTIONS*
Vesicles -
Size(mm): .1-.5
Percent: 2
AVERAGE SIZE .4MM*
Leg : 33 Top/Bottom Interval(mm): 1390/1410 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1006.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 1007.40 Sect/Pc #: 1/
ROCK = APHYRIC BASALT
MODERATELY ALTERED;
Texture: APHYRIC,VITROPHYRIC*
Groundmass - GROUNDMASS ( 96.5%)
Size(mm): <.05
PLAGIOCLASE
Morphology: SMALL LATHS
RANDOM,SOMEWHAT ALTERED TO MONTMORILLONITE;
AUGITE
Morphology: STELLATE
SOMEWHAT ALTERED TO MONTMORILLONITE;
MAGNETITE
Morphology: EUHEDRAL
ILMENITE
Morphology: SKELETAL LATHS
MAGN AND ILMENITE ABUNDANT,STAINED SECTIONS AND
X-RAY DATA SHOW NO NEPHELINE OR K-FELDSPAR*
Alteration - CALCITE ( 0%)
MONTMORILLONITE
Replacing: PLAG,AUGITE,GLASS
FORMERLY VERY FINE GRAINED AND GLASSY AREAS
COMPLETELY ALTERED TO BROWN AND GREEN
MONTMORILLONITE*
Vesicles -
Size(mm): 1-2
Percent: 3.5
Filling: MONTMORILLONITE
AVERAGE SIZE 1.5 MM*
Leg : 33 Top/Bottom Interval(mm): 1415/1435 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1006.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 1007.42 Sect/Pc #: 1/
ROCK = APHYRIC BASALT
SAME AS 32-1-139-141 BUT SOMEWHAT FRESHER,IN
REFLECTED LIGHT MAGNETITE SKELETAL XTLS AND
EUHEDRAL ARE MAGN-ILMENITE INTERGROWTHS,ILMENITE
SKELETAL LATHS ARE ALSO PRESENT*
Leg : 33 Top/Bottom Interval(mm): 795/ 800 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1006.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 1008.30 Sect/Pc #: 2/
ROCK = PLAG-AUGITE PHYRIC BASALT
INCLUDED IN DESCRIPTION OF 32-2-80-82,IN REFLECTED
LIGHT "MAGNETITES" ARE COMPLEX MAGN-ILMENITE
INTERGROWTHS,BLADED HOMOGENOUS ILMENITE ALSO
OCCURS,SCATTERED ROUNDED GRAINS OF CHALCOPYRITE
AND VEINS OF PYRITE OCCUR THROUGHOUT THE ROCK*
Leg : 33 Top/Bottom Interval(mm): 800/ 810 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1006.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 1008.31 Sect/Pc #: 2/
ROCK = PLAG-AUGITE PHYRIC BASALT
INCLUDED IN DESCRIPTION OF 32-2-80-82*
Leg : 33 Top/Bottom Interval(mm): 800/ 820 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1006.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 1008.31 Sect/Pc #: 2/
ROCK = PLAG-AUGITE PHYRIC BASALT
MODERATELY ALTERED;
Texture: PHYRIC,DIABASIC-TRACHYTIC*
Phenocrysts- PLAGIOCLASE ( 38.5%)
Size(mm): .4X1
AUGITE ( 8.5%)
Size(mm): .5X2
A FEW AUGITES OCCUR AS MICROPHENOS,REMAINDER
DIABASICALLY ENCLOSE PLAG*
Groundmass - GROUNDMASS ( 47.5%)
Size(mm): <.5
MAGNETITE
SCATTERED QUITE EVENLY THROUGH ROCK;
PLAGIOCLASE
Morphology: STUBBY LATHS
TEND TO BE ORIENTED PARALLEL TO CORE,CENTERS OF
SOME LATHS SHOW MONTMORILLONITE ALTERATION;
PYROXENE
MODERATELY ALTERED,VERY FINE PATCHES OF GROUNDMASS
MARKED BY FELDSPAR AND ILMENITE MICROLITES
COMPLETELY ALTERED TO BROWN MONTMORILLONITE*
Alteration - MONTMORILLONITE
Location: VESICLES Replacing: PLAG
CALCITE
Location: VESICLES
Vesicles -
Size(mm): .5-2.5
Percent: 5.5
Filling: MONT OR CALCITE
AVERAGE SIZE 1.5MM,GREEN MONT*
Leg : 33 Top/Bottom Interval(mm): 825/ 835 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1006.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 1008.33 Sect/Pc #: 2/
ROCK = PLAG-AUGITE PHYRIC BASALT;
Texture: PHYRIC,DIABASIC-TRACHYTIC*
Phenocrysts- PLAGIOCLASE ( 20.5%)
Size(mm): .4X1
AUGITE ( 7.0%)
Size(mm): .5X2
Groundmass - GROUNDMASS ( 67.5%)
Size(mm): <.5
IDENTICAL TO 32-2-79.5-80 EXCEPT IN REFLECTED
LIGHT MAGN IS PINKER AND SHOWS LESS TENDENCY TO
EXSOLVE ILMENITE*
Alteration - CALCITE
IDENTICAL TO 32-2-80-82 EXCEPT CALCITE DETECTED IN
X-RAY-NOT SEEN IN THIN SECTION*
Vesicles -
Size(mm): .5-3
Percent: 5
AVERAGE SIZE 1.5MM*
Leg : 33 Top/Bottom Interval(mm): 835/ 910 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1006.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 1008.37 Sect/Pc #: 2/
X-RAY IDENTICAL TO 32-2-82.5-83.5*
Leg : 33 Top/Bottom Interval(mm): 950/ 960 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1006.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 1008.46 Sect/Pc #: 2/
ROCK = PLAG-AUGITE PHYRIC BASALT
SAME AS 32-2-82.5-83.5*
Alteration - PYRITE
MONTMORILLONITE
SAME AS 32-2-82.5-83.5 EXCEPT THAT PYRITE GRAINS
AS LARGE AS 1MM OCCUR AS VESICLE FILLINGS INSIDE
MONTMORILLONITE RIMS*
Leg : 33 Top/Bottom Interval(mm): 960/1050 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1006.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 1008.51 Sect/Pc #: 2/
SAME AS 32-2-80-82 AND 95-96*
Leg : 33 Top/Bottom Interval(mm): 1050/1060 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1006.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 1008.56 Sect/Pc #: 2/
ROCK = APHYRIC BASALT;
Texture: APHYRIC,DIABASIC-TRACHYTIC*
Groundmass - GROUNDMASS ( 74.5%)
Size(mm): <.5
IDENTICAL IN MINERAL PROPORTIONS,TEXTURE AND
ALTERATION TO 32-1-139-141,FINER GRAINED BUT
OTHERWISE IDENTICAL TO SECTION FROM 32-2-79.5-82
AND 95-96,IN REFLECTED LIGHT SIMILAR TO 32-1-
141.5-143.5 EXCEPT THAT PYRITE IS MORE ABUNDANT,
ESPECIALLY AS VESICLE FILLINGS*
Vesicles -
Size(mm): .5-3
Percent: 5.5
Filling: PYRITE
AVERAGE SIZE 1.5MM*
Leg : 33 Top/Bottom Interval(mm): 70/ 90 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1006.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 1009.08 Sect/Pc #: 3/
ROCK = APHYRIC BASALT
MODERATELY TO HEAVILY ALTERED;
Texture: APHYRIC,DIABASIC*
Groundmass - PLAGIOCLASE
Morphology: STUBBY
SLIGHTLY ALTERED TO MONTMORILLONITE IN CENTRAL
PARTS;
AUGITE
INTERSTITIAL,ABOUT HALF ALTERED TO
MONTMORILLONITE,ROCK IS EVEN GRAINED AND APPEARS
TO HAVE CONTAINED LITTLE GLASS;
MAGNETITE
TENDS TO OCCUR IN INTERSTICES BETWEEN PLAG GRAINS;
ILMENITE
CONCENTRATED IN PLAG*
Alteration - MONTMORILLONITE
Location: VESICLES Replacing: PLAG+AUGITE
PYRITE
LOCALLY ABUNDANT REPLACING CENTRAL PARTS OF
VESICLES,STAINED SECTIONS AND X-RAYS SHOW NO
NEPHELINE OR K-FELDSPAR*
Vesicles -
Size(mm): 1X4
Percent: 8.5
Filling: MONT+PYRITE
AVERAGE SIZE 2MM*
Leg : 33 Top/Bottom Interval(mm): 95/ 115 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1006.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 1009.10 Sect/Pc #: 3/
ROCK = APHYRIC BASALT
SAME AS 32-3-7-9 EXCEPT "MAGNETITE" OCCURS AS
MAGNETITE-ILMENITE INTERGROWTHS IN EUHEDRAL TO
SKELETAL XTLS,ILMENITE IN LATHS,MOSTLY IN PYX,
CHALCOPYRITE IN TINY ROUNDED GRAINS THROUGHOUT THE
ROCK,PYRITE IS ABUNDANT IN GRAINS AS LARGE AS 1MM
IN VESICLES,IN SOME CASES IT IS RIMMED BY
PLATELETS OF HEMATITE*
SAME AS 32-3-7-9*
Leg : 33 Top/Bottom Interval(mm): 850/ 870 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1006.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 1009.86 Sect/Pc #: 3/
ROCK = APHYRIC BASALT;
Texture: APHYRIC-DIABASIC*
Groundmass - GROUNDMASS ( 90.5%)
Size(mm): <.5
Alteration - CALCITE
Location: VESICLES
MARCASITE
Location: VESICLES
Vesicles -
Size(mm): .5-3
Percent: 9.5
Filling: CALCITE+
Filling: MARCASITE
AVERAGE SIZE 1MM,APPEARS IDENTICAL IN TEXTURE
AND ALTERATION TO 32-3-7-9 EXCEPT SLIGHTLY MORE
VUGGY,SLIGHTLY COARSER GRAINED,AND CALCITE APPEARS
AS A VESICLE-FILLING MINERAL,MARCASITE IDENTIFIED
IN VESICLE FILLING BY X-RAY DIFFRACTION*
Leg : 33 Top/Bottom Interval(mm): 875/ 895 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1006.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 1009.89 Sect/Pc #: 3/
ROCK = APHYRIC BASALT
SAME AS 32-3-85-87,IN REFLECTED LIGHT IS MUCH LIKE
32-3-9.5-11.5 EXCEPT CONTAINS MUCH LESS PYRITE AS
A VUG FILLING MATERIAL*
Leg : 33 Top/Bottom Interval(mm): 530/ 550 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1006.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 1011.04 Sect/Pc #: 4/
ROCK = APHYRIC BASALT
MODERATELY ALTERED;
Texture: APHYRIC,DIABASIC-INTERSERTAL*
Groundmass - GROUNDMASS ( 91%)
Size(mm): <.5
PLAGIOCLASE
Morphology: STUBBY
LITTLE ALTERED;
AUGITES
DIABASIC,PARTIALLY ALTERED TO MONTMORILLONITE;
MAGNETITE
INTERSTITIAL TO PLAG LATHS;
ILMENITE
Morphology: LATHS
NOT ABUNDANT,CONCENTRATED IN PATCHY AREAS THAT
APPEAR TO HAVE BEEN GLASSY,ALL GLASSY MATERIAL
ALTERED TO BROWN MONTMORILLONITE,IN REFLECTED
LIGHT MAGNETITE IS PINKISH AND DOES NOT EXSOLVE
ILMENITE,BUT IS INTERGROWN WITH UNUSUAL AMOUNTS OF
ULVOSPINEL,ILMENITE OCCURS AS SPARSE LATHS*
Alteration - CALCITE ( 0%)
CHALCOPYRITE
MINOR BLEBS;
PYRITE
IN SPARSE VEINS AND IN ONE VESICLE,NO NEPHELINE OR
K-FELDSPAR PRESENT*
Vesicles -
Size(mm): .2-2
Percent: 9
Filling: PYRITE
AVERAGE SIZE .8MM*
Leg : 33 Top/Bottom Interval(mm): 560/ 580 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1006.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 1011.07 Sect/Pc #: 4/
ROCK = APHYRIC BASALT
SAME AS 32-4-53-55 BUT SOMEWHAT FEWER FORMERLY
GLASSY AREAS AND FRESHER*
Leg : 33 Top/Bottom Interval(mm): 590/ 610 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1006.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 1011.10 Sect/Pc #: 4/
ROCK = APHYRIC BASALT
SAME AS 32-4-53-55 BUT IN REFLECTED LIGHT CONTAINS
MORE CHALCOPYRITE AND PYRITE*
Alteration - CALCITE
SAME AS 32-4-56-58 BUT CONTAINS MORE CALCITE*
Leg : 33 Top/Bottom Interval(mm): 1490/1500 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1006.00 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 1011.99 Sect/Pc #: 4/
ROCK = APHYRIC BASALT
SAME AS 32-4-56-58*
SAME AS 32-4-59-61*
Leg : 33 Top/Bottom Interval(mm): 1165/1185 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1015.50 Rock Type: IGNEOUS
Core: 33 Sample Midpoint(m) : 1016.67 Sect/Pc #: 1/
ROCK = APHYRIC BASALT
SAME AS 33-1-121-123*
Groundmass - MAGNETITE
Size(mm): .01 Morphology: OCTAHEDRAL
IN REFLECTED LIGHT VERY TINY OCTAHEDRA OF MAGN
EXSOLVING ULVOSPINEL;
ILMENITE
Morphology: LATHS
SOME TINY LATHS,VERY MINOR AMOUNTS OF SULFIDES
SEEN IN SECTION*
Leg : 33 Top/Bottom Interval(mm): 1210/1230 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1015.50 Rock Type: IGNEOUS
Core: 33 Sample Midpoint(m) : 1016.72 Sect/Pc #: 1/
ROCK = APHYRIC BASALT
HEAVILY ALTERED;
Texture: APHYRIC,VITROPHYRIC*
Groundmass - GROUNDMASS ( 98%)
Size(mm): <.2
PLAGIOCLASE
Size(mm): .05X.5 Morphology: LATHS
UNALTERED;
AUGITE
PRESENT IN VERY SMALL AMOUNTS AND ALMOST
COMPLETELY ALTERED TO MONTMORILLONITE;
OPAQUE MINERAL
VERY TINY AND SCATTERED THROUGHOUT ROCK;
ALTERED GLASS
APPARENTLY THE ROCK CONSISTED OF NEARLY 40% GLASS
WHICH IS NOW COMPLETELY ALTERED TO MONTMORILLONITE
NO NEPHELINE OR K-FELDSPAR PRESENT*
Alteration - MONTMORILLONITE
Replacing: AUGITE+GLASS
CALCITE
Location: VESICLES
Vesicles -
Size(mm): .1-1
Percent: 2
Filling: CALCITE
AVERAGE SIZE .5MM*
Leg : 33 Top/Bottom Interval(mm): 0/ 0 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1015.50 Rock Type: IGNEOUS
Core: 33 Sample Midpoint(m) : 1017.10 Sect/Pc #: CC/
ROCK = APHYRIC BASALT
SAME AS 33-1-121-123*
MUCH LIKE 33-1-121-123 BUT SLIGHTLY COARSER,PLAG
LATHS AVERAGE .4X.6MM AND AUGITE IS PRESENT AS
.4X.8 LATHS AND STUBBY XTLS,PYX IS LESS ALTERED*
Leg : 33 Top/Bottom Interval(mm): 710/ 730 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1025.00 Rock Type: IGNEOUS
Core: 34 Sample Midpoint(m) : 1025.72 Sect/Pc #: 1/
ROCK = APHYRIC-PLAG-AUGITE MICROPHYRIC BASALT
MODERATELY ALTERED;
Texture: APHYRIC-MICROPHYRIC,INTERSERTAL-DIABASIC*
Groundmass - GROUNDMASS ( 92.5%)
Size(mm): <.5
PLAGIOCLASE
Size(mm): .5X.05 Morphology: SERIATE
SIZE TO .5X3MM,SLIGHTLY ALTERED TO MONTMORILLONITE
IN CENTERS;
AUGITE
MOSTLY DIABASICALLY ENCLOSING THE PLAG,PARTLY AS
STUBBY .3MM XTLS ALMOST COMPLETELY ALTERED TO
MONTMORILLONITE;
GLASS
PERHAPS 20% OF ROCK WAS GLASSY,INTERSERTAL-NOW IS
COMPLETELY ALTERED;
OPAQUE MINERALS
SCATTERED RATHER EVENLY THROUGH THE ROCK,NO
NEPHELINE OR K-FELDSPAR IS OBSERVED*
Alteration - MONTMORILLONITE
Location: VESICLES Replacing: PLAG+GLASS+AUGITE
CALCITE
Location: VESICLES
Vesicles -
Size(mm): .2-1
Percent: 7.5
Filling: MONT+CALCITE
AVERAGE SIZE .5MM*
Leg : 33 Top/Bottom Interval(mm): 735/ 755 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1025.00 Rock Type: IGNEOUS
Core: 34 Sample Midpoint(m) : 1025.74 Sect/Pc #: 1/
ROCK = APHYRIC-PLAG-AUGITE MICROPHYRIC BASALT
SAME AS 34-1-71-73 EXCEPT IN REFLECTED LIGHT MAGN
EXSOLVES ULVOSPINEL,ILMENITE LATHS ARE LOCALIZED
IN FORMERLY GLASSY AREAS,CHALCOPYRITE IS PRESENT
BUT NOT ABUNDANT*
Leg : 33 Top/Bottom Interval(mm): 990/1010 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1025.00 Rock Type: IGNEOUS
Core: 34 Sample Midpoint(m) : 1026.00 Sect/Pc #: 1/
ROCK = APHYRIC-PLAG-AUGITE MICROPHYRIC BASALT
SAME AS 34-1-71-73,
SAME AS 34-1-73.5-75.5 IN REFLECTED LIGHT EXCEPT
SOME ANATASE PRESENT AS ALTERATION OF ILMENITE,
APPROX COMP PLAG AN68.6(X-RAY DETERMINATION)*
SAME AS 31-1-73-75 AND 73.5-75.5 EXCEPT MORE
CALCITE IS PRESENT AS VEINS AND PYRITE OCCURS
AS A VESICLE FILLING MATERIAL*
Alteration - PYRITE
Leg : 33 Top/Bottom Interval(mm): 0/ 0 Describer: Jackson, E.D.
Hole: 315A Top of Core Depth(m) : 1025.00 Rock Type: IGNEOUS
Core: 34 Sample Midpoint(m) : 1026.60 Sect/Pc #: CC/
ROCK = APHYRIC BASALT;
Texture: APHYRIC,VITROPHYRIC*
Groundmass - GROUNDMASS ( 92.5%)
Size(mm): <.2
PLAGIOCLASE
Size(mm): .01-.5
VERY FINE GRAINED,APPEARS UNALTERED;
PYROXENE ( 0%)
NONE REMAINS;
GLASS
ORIGINAL MATERIAL APPEARS TO HAVE BEEN LARGELY
GLASS,IS NOW COMPLETELY ALTERED TO
MONTMORILLONITE*
Alteration - MONTMORILLONITE
Replacing: GLASS
Vesicles -
Size(mm): .2-9
Percent: 7.5
Filling: CALCITE
AVERAGE SIZE .5MM*
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