Leg : 60 Top/Bottom Interval(mm): 440/ 470 Describer: Natland, J.
Hole: 459B Top of Core Depth(m) : 558.50 Rock Type: IGNEOUS
Core: 60 Sample Midpoint(m) : 558.96 Sect/Pc #: 1/PCE 1
ROCK = APHYRIC BASALT;
ALTERED;
Texture: MICROLITIC-SPHERULITIC
TEXTURE IS QUITE VARIABLE IN THIS THIN SECTION,
SPHERULITIC ON ONE SIDE-MICROLITIC ON THE OTHER;
Where sampled: TOP EDGE OF FLOW OR SILL*
Phenocrysts- COMBINATION
SOME COARSER GRAINED PATCHES WITH CPX AND PLAG,BUT
NO ACTUAL PHENOCRYSTS*
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): 0.1-0.6 Morphology: SKELETAL,ELONGATE
MICROLITES AND SOME SPHERULITES;
CLINOPYROXENE ( 5%)
Morphology: FIBROUS SPHERULITES
NOT EASY TO ESTIMATE ABUNDANCE-CONTAINS MUCH GLASS
BETWEEN THE FIBERS;
MAGNETITE ( 2%)
Morphology: CUBIC
FAIRLY ABUNDANT;
MICROCRYST GROUNDMASS
MICROCRYSTALLINE TO GLASSY MESOSTASIS,GENERALLY
ALTERED TO ORANGE CLAYS*
Alteration - CLAY MINERALS
Replacing: MICROXLN
Vesicles -
Size(mm): 0.1-0.5
Percent: 25
Location: THROUGHOUT
Filling: CLAY-LINED
Shape: IRREGULAR
Leg : 60 Top/Bottom Interval(mm): 1130/1150 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 558.50 Rock Type: IGNEOUS
Core: 60 Sample Midpoint(m) : 559.64 Sect/Pc #: 1/PCE 10
ROCK = APHYRIC BASALT
COARSE GRAINED BASALT OR FINE GRAINED DIABASE;
Texture: SUBOPHITIC-INTERSERTAL*
Groundmass - PLAGIOCLASE ( 30%)
CLINOPYROXENE ( 22%)
GLASS ( 19%)
DEVITRIFIED,ALTERED;
TITANOMAGNETITE ( 3%)
OLIVINE ( 1%)
SIZE UNCERTAIN-SLIDE IS TOO THICK*
Alteration - FERROUS OXIDE ( 30%)
Location: SCATTERED AND Replacing: GLASS,PLAG,CPX,CARB
Location: FILL VESICLES
CONTAINS ORANGE-BROWN STUFF*
Vesicles -
Size(mm): 0.2-4.0
Percent: 25
Location: THROUGHOUT
Filling: CARB
FILLING BY ORANGE-BROWN FILM-LIKE NEARLY ISOTROPIC
SUBSTANCE(PALAGONITE?),IT COULD BE AS WELL OVER-
COOKED EPOXY FILM*
Leg : 60 Top/Bottom Interval(mm): 280/ 310 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 558.50 Rock Type: IGNEOUS
Core: 60 Sample Midpoint(m) : 560.30 Sect/Pc #: 2/PCE 3B
ROCK = APHYRIC BASALT;
Texture: SPHERULITIC-SUBOPHITIC,INTERSERTAL;
Phenocrysts- CLINOPYROXENE
Size(mm): 0.1-0.4
APPROX COMP AUG.;
PLAGIOCLASE
Size(mm): 0.2-0.3
APPROX COMP AN60-70,SCATTERED MICROPHENOS,RATIO OF
PLAG TO CPX IS 1:9*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): 0.05-0.2
HIGH UNDERCOOLING FORM;
CLINOPYROXENE ( 20%)
Size(mm): 0.05-0.1
HIGH UNDERCOOLING FORM;
GLASS ( 15%)
DEVITRIFIED AND PARTLY TO BADLY ALTERED;
TITANOMAGNETITE ( 1%)
HIGH UNDERCOOLING FORM*
Alteration - CARBONATE
Location: VESICLES
COMBINATION
Replacing: GLASS,CRYSTALLITES
INCLUDES CLAY.MINS + FE-OXIDES*
Vesicles -
Size(mm): 0.1-1.0
Percent: 15
Location: THROUGHOUT
Filling: BROWN CLAY,CARB
Shape: ROUND TO
Shape: IRREGULAR
FILLING PARTLY BY BROWN CLAY,RARELY BY CARBONATE*
Leg : 60 Top/Bottom Interval(mm): 960/ 980 Describer: Natland, J.
Hole: 459B Top of Core Depth(m) : 558.50 Rock Type: IGNEOUS
Core: 60 Sample Midpoint(m) : 560.97 Sect/Pc #: 2/PCE 8
ROCK = APHYRIC BASALT;
Texture: INTERSERTAL,APHYRIC;
Where sampled: FLOW INTERIOR*
Groundmass - MICROCRYST GROUNDMASS ( 40%)
CRYPTOCRYSTALLINE WITH SKELETAL PLAG AND
TITANOMAGNETITE AND SPHERULITIC CPX;
PLAGIOCLASE ( 30%)
Size(mm): 0.1-1.0 Morphology: EUHEDRAL-SKELETAL,PATCHY
APPROX COMP AN70-75;
CLINOPYROXENE ( 20%)
Size(mm): 0.1-0.5 Morphology: GRANULAR
2VX OF 55,APPROX COMP AUG.;
MAGNETITE ( 2%)
Morphology: CUBIC-ELONGATE AND SKELETAL
Alteration - CARBONATE ( 5%)
Location: SCATTERED Replacing: MESOSTASIS
CLAY MINERALS
Replacing: MESOSTASIS
IN CRYPTOCRYSTALLINE MATERIAL,POORLY DEFINED;
ZEOLITE ( TR%)
ASSOCIATED WITH FE.HYDRX NEAR VESICLES;
FERROUS HYDROX MINS ( TR%)
Location: NEAR VESICLES
Vesicles -
Size(mm): 0.3-0.5
Percent: 3
Location: SCATTERED
Filling: NONE
Shape: IRREGULAR
Leg : 60 Top/Bottom Interval(mm): 1060/1070 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 568.00 Rock Type: IGNEOUS
Core: 61 Sample Midpoint(m) : 569.07 Sect/Pc #: 1/PCE 10
ROCK = QUARTZ DIABASE;
Texture: SUBOPHITIC,INTERGRANULAR,MICROPEGMATIC;
Where sampled: SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 67%)
Size(mm): 0.1-1.0
APPROX COMP AN50-55;
GLASS ( 20%)
DEVITRIFIED AND BADLY ALTERED;
CLINOPYROXENE ( 7%)
Size(mm): 0.05-0.8
PIGEONITE;
TITANOMAGNETITE ( 3%)
Size(mm): 0.01-0.2
ALKALI FELDSPAR ( 2%)
FORMS INTERSTITIAL MICROPEGMATIC INTERGROWTHS WITH
QUARTZ;
QUARTZ ( 1%)
Size(mm): 0.01-0.05
Alteration - CLAY MINERALS ( 14%)
Location: VESICLES Replacing: GLASS
COMBINATION ( 1%)
Location: INTERSTITIAL Replacing: GLASS,MICROPEGMATIC
Location: GLASS Replacing: AGGREGATES
INCLUDES ZEOLITES + QUARTZ*
Vesicles -
Size(mm): 0.3-1.0
Percent: 3
Location: THROUGHOUT
Filling: CLAY,ZEOLITE,
Shape: IRREGULAR
Filling: QUARTZ
Leg : 60 Top/Bottom Interval(mm): 1260/1290 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 568.00 Rock Type: IGNEOUS
Core: 61 Sample Midpoint(m) : 569.28 Sect/Pc #: 1/PCE 13
ROCK = DOLERITE
SLIDE IS TOO THIN;
Texture: SUBOPHITIC,INTERSERTAL*
Groundmass - PLAGIOCLASE ( 57%)
Size(mm): 0.5-1.5
CLINOPYROXENE ( 26%)
Size(mm): 0.1-1.0
GLASS ( 10%)
TOTALLY ALTERED TO CLAYS AND CARB;
MAGNETITE ( 2%)
Size(mm): <0.01
Alteration - COMBINATION ( 9%)
Location: GROUNDMASS, Replacing: INTERSTITIAL PHASES
Location: VESICLES
INCLUDES CLAY.MINS + FE.OXIDES,PETROLOGIST GIVES
PERCENTAGE HERE AS 60%;
CARBONATE ( 6%)
Location: GROUNDMASS, Replacing: INTERSTITIAL PHASES
Location: VESICLES
PETROLOGIST GIVES PERCENTAGE CARB AS 40%, ICD SAYS
SLIDE IS SIMILAR TO PREVIOUS SLIDE;
ZEOLITE ( 1-2%)
SMALL SPHERULITES IN VESICLES*
Vesicles -
Size(mm): 0.3-2.0
Percent: 5
Location: THROUGHOUT
Filling: CLAY.MINS,FE.OX
Shape: IRREGULAR
Filling: CARB
CARBONATE(?) IN SOME ESPECIALLY LARGE VESICLES*
Leg : 60 Top/Bottom Interval(mm): 690/ 700 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 568.00 Rock Type: IGNEOUS
Core: 61 Sample Midpoint(m) : 570.20 Sect/Pc #: 2/PCE 8
ROCK = DOLERITE;
Texture: SUBOPHITIC,INTERSERTAL*
Phenocrysts- CLINOPYROXENE ( <1%)
Size(mm): TO 2.5 Morphology: EUHEDRAL
SINGLE GLOMEROCRYST IN THE THIN SECTION,APPROX
COMP AUG.*
Groundmass - PLAGIOCLASE ( 57%)
Size(mm): TO 1.5
APPROX COMP AN70;
GLASS ( 25%)
ALTERED TO CLAYS;
CLINOPYROXENE ( 15%)
Size(mm): 0.1-1.0
APPROX COMP AUG.;
MAGNETITE ( 3%)
Alteration - CLAY MINERALS ( 16%)
Location: VESICLES, Replacing: GLASS
Location: INTERSTICES
CARBONATE ( 4%)
Location: VESICLES, Replacing: GLASS
Location: INTERSTICES
Vesicles -
Size(mm): 0.1-0.5
Percent: 3
Location: THROUGHOUT
Filling: CLAY + CARB
Shape: IRREGULAR
Leg : 60 Top/Bottom Interval(mm): 440/ 460 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 577.50 Rock Type: IGNEOUS
Core: 62 Sample Midpoint(m) : 577.95 Sect/Pc #: 1/PCE 4
ROCK = APHYRIC BASALT;
Texture: APHYRIC,SUBOPHITIC,INTERSTITIAL*
Groundmass - PLAGIOCLASE ( 51%)
Size(mm): 0.2-1.0
APPROX COMP AN60;
GLASS ( 23%)
SLIGHTLY ALTERED DEVITRIFIED AND SOMETIMES
SPHERULITIC;
CLINOPYROXENE ( 14%)
Size(mm): 0.05-1.0
APPROX COMP AUG.;
TITANOMAGNETITE ( 2%)
Morphology: SKELETAL
Alteration - CLAY MINERALS ( 5-10%)
Location: VESICLES AND Replacing: GLASS,PYX
Location: INTERSTICES
Vesicles -
Size(mm): 0.3-7.0
Percent: 10
Location: THROUGHOUT
Filling: CLAY
Shape: IRREGULAR
VESICLES PARTLY FILLED*
Leg : 60 Top/Bottom Interval(mm): 240/ 270 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 587.00 Rock Type: IGNEOUS
Core: 63 Sample Midpoint(m) : 587.26 Sect/Pc #: 1/PCE 3
ROCK = APHYRIC BASALT;
Texture: HYALOPILITIC,APHYRIC*
Groundmass - GLASS ( 75%)
PARTLY DEVITRIFIED AND BADLY ALTERED,PETROGRAPHER
GIVES THIS PERCENTAGE AS 90%;
CLINOPYROXENE ( 5%)
Size(mm): 0.01-0.1
PLAGIOCLASE ( 3%)
Size(mm): 0.01-0.1
MAGNETITE ( <1%)
Size(mm): <0.01 Morphology: DENDRITIC
Alteration - COMBINATION ( 50%)
Location: FILL VESICLES Replacing: GLASS,CPX CRYSTALLITES
INCLUDES CLAY.MINS + FE.HYDRX*
Vesicles -
Size(mm): 0.2-7.0
Percent: 10
Location: THROUGHOUT
Filling: BROWN CLAY
Shape: ROUND TO
Shape: IRREGULAR
VESICLES PARTLY FILLED*
Leg : 60 Top/Bottom Interval(mm): 810/ 830 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 587.00 Rock Type: IGNEOUS
Core: 63 Sample Midpoint(m) : 587.82 Sect/Pc #: 1/PCE 10
ROCK = APHYRIC BASALT;
Texture: HYALOPILITIC-INTERSERTAL,APHYRIC;
Groundmass - GLASS ( 55%)
PARTLY DEVITRIFIED AND BADLY ALTERED,PETROGRAPHER
GIVES THIS PERCENTAGE AS 72%;
PLAGIOCLASE ( 15%)
Size(mm): 0.01-0.3 Morphology: MICROLITIC
ALTERED TO CLAYS;
CLINOPYROXENE ( 10%)
Size(mm): 0.01-0.2 Morphology: MICROLITIC
ALTERED TO CLAYS;
TITANOMAGNETITE ( 3%)
Size(mm): <0.01 Morphology: SKELETAL
Alteration - CLAY MINERALS ( 50%)
Location: THROUGHOUT Replacing: GLASS,PLAG+CPX XTLITES
Vesicles -
Size(mm): 0.1-3.0
Percent: 10
Location: THROUGHOUT
Filling: EMPTY
Shape: ROUND TO
Shape: IRREGULAR
MAINLY EMPTY*
Leg : 60 Top/Bottom Interval(mm): 330/ 360 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 596.50 Rock Type: IGNEOUS
Core: 64 Sample Midpoint(m) : 596.85 Sect/Pc #: 1/PCE 2B
ROCK = APHYRIC BASALT;
Texture: HYALOPILITIC-INTERSERTAL,APHYRIC*
Groundmass - GLASS ( 57%)
TOTALLY ALTERED TO CLAYS,PETROGRAPHER GIVES
PERCENTAGE AS 67%;
PLAGIOCLASE ( 20%)
Size(mm): 0.05-0.5
CLINOPYROXENE ( 9%)
Size(mm): 0.02-0.3
TITANOMAGNETITE ( 3%)
Size(mm): TO 0.05 Morphology: SKELETAL
Alteration - CLAY MINERALS (60-70%)
Location: THROUGHOUT Replacing: GLASS,CPX
ZEOLITE ( <1%)
IDENTITY UNCERTAIN*
Vesicles -
Size(mm): 0.5-1.5
Percent: 10
Location: THROUGHOUT
Filling: EMPTY,CLAY
Shape: IRREGULAR
SOME CLAY-LINED*
Leg : 60 Top/Bottom Interval(mm): 580/ 600 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 606.00 Rock Type: IGNEOUS
Core: 65 Sample Midpoint(m) : 606.59 Sect/Pc #: 1/PCE 8
ROCK = APHYRIC BASALT;
Texture: HYALOPILITIC,APHYRIC*
Phenocrysts- PLAGIOCLASE ( 0.7%)
Size(mm): TO 0.9 Morphology: EUHEDRAL,TABULAR
APPROX COMP UNKNOWN;
CLINOPYROXENE ( 0.3%)
Size(mm): TO 0.4 Morphology: EUHEDRAL,PRISMATIC
APPROX COMP AUG.*
Groundmass - GLASS ( 80%)
DEVITRIFIED AND ALTERED TO CLAYS;
PLAGIOCLASE ( 5%)
Size(mm): TO 0.2 Morphology: MICROLITIC
CLINOPYROXENE ( 3%)
Size(mm): <0.1 Morphology: MICROLITIC
TITANOMAGNETITE ( 1%)
Morphology: DENDRITIC,ELONGATE
THINLY DENDRITIC ELONGATE CRYSTALLITES*
Alteration - CLAY MINERALS ( 60%)
Location: VESICLES, Replacing: GLASS
Location: GLASSY MATRIX
CHLORITE ( TR%)
Replacing: CPX MICROPHENOCRYSTS
Vesicles -
Size(mm): 0.05-5.0
Percent: 10
Location: SCATTERED
Shape: ROUND TO
Shape: IRREGULAR
PARTLY FILLED BY BROWN CLAY*
Leg : 60 Top/Bottom Interval(mm): 880/ 900 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 606.00 Rock Type: IGNEOUS
Core: 65 Sample Midpoint(m) : 606.89 Sect/Pc #: 1/PCE 10A
ROCK = APHYRIC BASALT;
Texture: HYALOPILITIC,APHYRIC*
Groundmass - GLASS ( 42%)
NEARLY OPAQUE,DARK BROWN TO BROWNISH-BLACK,
PERVASIVE ALTERATION TO CLAYS,PETROGRAPHER GIVES
PERCENTAGE OF GLASS AS 62%;
PLAGIOCLASE ( 20%)
Size(mm): 0.05-0.25 Morphology: MICROLITIC
CLINOPYROXENE ( 15%)
Size(mm): 0.01-0.2 Morphology: MICROLITIC
MAGNETITE ( 3%)
Morphology: SKELETAL,CRYSTALLINE
Alteration - COMBINATION ( 60%)
Location: THROUGHOUT Replacing: CPX,MAGN,GLASS,
Replacing: MESOSTASIS
INCLUDES CLAY.MINS + FE.HYDRX + OXIDES*
Vesicles -
Size(mm): 0.05-3.5
Percent: 15-20
Location: THROUGHOUT
Filling: EMPTY,CLAY
Shape: IRREGULAR
TRACE OF CLAY FILLING SOME VESICLES*
Leg : 60 Top/Bottom Interval(mm): 40/ 70 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 615.50 Rock Type: IGNEOUS
Core: 66 Sample Midpoint(m) : 617.06 Sect/Pc #: 2/PCE 1
ROCK = DOLERITE;
Texture: SUBOPHITIC-INTERSERTAL,APHYRIC;
Where sampled: FLOW OR SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 55%)
Size(mm): 0.1-1.0
APPROX COMP AN65-70;
GLASS ( 15%)
CLAY MINERALS ( 15%)
CLINOPYROXENE ( 10%)
Size(mm): 0.05-0.7
TITANOMAGNETITE ( 5%)
Size(mm): 0.05-0.4
ILMENITE ( <1%)
Size(mm): <0.01 Morphology: DENDRITIC
MINOR INTERSTITIAL COMPONENT;
QUARTZ ( TR%)
INTERSTITIAL MICROPEGMATIC INTERGROWTHS;
ALKALI FELDSPAR ( TR%)
INTERSTITIAL MICROPEGMATIC INTERGROWTHS;
APATITE
A SINGLE NEEDLE WAS OBSERVED*
Alteration - CLAY MINERALS ( 15%)
Location: VESICLES AND
Location: INTERSTITIAL
Location: MATERIAL
ZEOLITE ( TR%)
ID UNCERTAIN FOR ZEOLITE*
Vesicles -
Size(mm): 0.1-2.0
Percent: 5
Location: THROUGHOUT
Filling: CLAY
Shape: IRREGULAR
Leg : 60 Top/Bottom Interval(mm): 30/ 40 Describer: Natland, J.
Hole: 459B Top of Core Depth(m) : 615.50 Rock Type: IGNEOUS
Core: 66 Sample Midpoint(m) : 618.53 Sect/Pc #: 3/PCE 1
ROCK = QUARTZ DIABASE
DIABASE (ALTERED DOLERITE),TWO DESCRIPTIONS FOR
THIS SECTION,THIS ONE NOT USED IN ICD;
Texture: SUBOPHITIC-INTERSERTAL;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 45%)
Morphology: PRISMATIC,EUHEDRAL
APPROX COMP AN70-75,ZONED TO ABOUT AN50;
CLINOPYROXENE ( 15%)
Morphology: GRANULAR,ANHEDRAL
APPROX COMP AUGITE;
MICROCRYST GROUNDMASS ( 15%)
ALTERED;
QUARTZ ( 15%)
SECONDARY,QUARTZ + CLAYS + ZEOLITES CONCENTRATED
NEAR ONE LARGE VESICLE IN ONE PLACE,ELSEWHERE
DISPERSED ZEOLITES REPLACES QUARTZ;
MAGNETITE ( 5%)
Size(mm): 0.1-0.3 Morphology: COARSE,SKELETAL
Alteration - CLAY MINERALS ( 15%)
Replacing: INTERSERTAL MESOSTASIS
GREEN COLOR;
QUARTZ ( 15%)
Location: VESICLES Replacing: MESOSTASIS
ASSOCIATED WITH CLAYS AND ZEOLITES;
ZEOLITE ( 5%)
Replacing: PLAG + QUARTZ
WORMLIKE*
Leg : 60 Top/Bottom Interval(mm): 30/ 40 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 615.50 Rock Type: IGNEOUS
Core: 66 Sample Midpoint(m) : 618.53 Sect/Pc #: 3/PCE 1
ROCK = QUARTZ DIABASE
TWO DESCRIPTIONS FOR THIS SECTION,THIS ONE WAS
USED IN ICD;
Where sampled: SILL INTERIOR*
Texture: SUBOPHITIC,MICROPEGMATIC,INTERGRANULAR,APHYRIC;
Groundmass - PLAGIOCLASE ( 60%)
Size(mm): 0.1-1.5 Morphology: LATHS
APPROX COMP AN50(?);
CLINOPYROXENE ( 15%)
Size(mm): 0.05-0.8
PIGEONITE;
GLASS ( 10%)
TOTALLY REPLACED BY CLAYS(SMECTITE) AND FE.HYDRXS;
QUARTZ ( 5%)
Size(mm): 0.01-0.5 Morphology: SUBHEDRAL
FORMS INTERSTITIAL MICROPEGMATIC INTERGROWTHS;
ALKALI FELDSPAR ( 4%)
ORTHOCLASE AND QUARTZ FORMING INTERSTITIAL
MICROPEGMATIC INTERGROWTHS;
TITANOMAGNETITE ( 2%)
Size(mm): 0.01-0.2 Morphology: SKELETAL
Alteration - CLAY MINERALS ( 10%)
Location: VESICLES AND Replacing: GLASS,MICROPEGMATIC
Location: INTERSTICES Replacing: AGGREGATES
FERROUS HYDROX MINS
Location: VESICLES AND
Location: INTERSTICES
Vesicles -
Size(mm): TO 2.0
Percent: 3
Location: THROUGHOUT
Filling: GREEN CLAY
Shape: IRREGULAR
CLAY FILLING COULD BE SMECTITE,SHAPE IS MAINLY AS
SPACE BETWEEN MINERAL CRYSTALS*
Leg : 60 Top/Bottom Interval(mm): 1060/1070 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 625.00 Rock Type: IGNEOUS
Core: 67 Sample Midpoint(m) : 626.07 Sect/Pc #: 1/PCE 8B
ROCK = DIABASE;
Texture: SUBOPHITIC-INTERSERTAL,APHYRIC*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): 0.2-1.2
APPROX COMP AN55-60,NORMAL ZONATION;
GLASS ( 25%)
DEVITRIFIED,CONTAINS SKELETAL CRYSTALLITES;
CLINOPYROXENE ( 10%)
Size(mm): 0.1-0.7
SUBCALCIC AUGITE,2VZ OF 40 OR LESS;
TITANOMAGNETITE ( 5%)
Size(mm): 0.01-0.15
COMBINATION ( TR%)
INCLUDES QUARTZ + ALK.SPAR,RARE INTERSTITIAL
MICROPEGMATIC QUARTZ-ALKALI FELDSPAR INTERGROWTHS*
Alteration - CLAY MINERALS ( 15%)
Location: VESICLES AND Replacing: GLASS,CPX,PLAG
Location: INTERSTITIAL Replacing: MICROLITES
Location: MATRIX
REPLACES SOME PLAG + CPX MICROLITES WITHIN SUBXTLN
AREA*
Vesicles -
Size(mm): 0.3-1.5
Percent: 5
Location: THROUGHOUT
Filling: GREEN CLAY
Shape: IRREGULAR
Leg : 60 Top/Bottom Interval(mm): 500/ 540 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 625.00 Rock Type: IGNEOUS
Core: 67 Sample Midpoint(m) : 627.02 Sect/Pc #: 2/PCE 5
ROCK = DIABASE;
Texture: SUBOPHITIC-INTERSERTAL,APHYRIC*
Groundmass - PLAGIOCLASE ( 60%)
Size(mm): 0.3-1.3
APPROX COMP AN55-60,INTERSTITIAL PLAG OF COMP AN30
OR LESS,MICROPEGMATIC INTERGROWTHS WITH QUARTZ ARE
ABUNDANT;
GLASS ( 25%)
DEVITRIFIED AND ALTERED,CONTAINS TINY DENDRITIC
CRYSTALLITES OF OPAQUE MINS.,ALSO PRESENT WITHIN
MICROPEGMATIC AGGREGATES;
TITANOMAGNETITE ( 5%)
Size(mm): 0.01-0.15
QUARTZ
IN MICROPEGMATIC INTERGROWTHS WITH PLAG BUT
SEPARATE GRAINS WERE NOT DETERMINED*
Alteration - CLAY MINERALS (10-15%)
Location: VESICLES AND Replacing: DEVITRIFIED GLASS,CPX
Location: INTERSTICES
ZEOLITE
IDENTITY UNCERTAIN FOR ZEOLITES*
Vesicles -
Size(mm): 0.03-1.0
Percent: 1-3
Location: SCATTERED
Filling: GREEN CLAY
Shape: IRREGULAR
Leg : 60 Top/Bottom Interval(mm): 240/ 260 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 634.50 Rock Type: IGNEOUS
Core: 68 Sample Midpoint(m) : 634.75 Sect/Pc #: 1/PCE 2
ROCK = APHYRIC BASALT;
Texture: INTERSERTAL,APHYRIC*
Groundmass - GLASS ( 53%)
DEVITRIFIED AND TOTALLY ALTERED;
PLAGIOCLASE ( 30%)
Size(mm): 0.05-0.5
APPROX COMP AN50(?);
CLINOPYROXENE ( 10%)
Size(mm): 0.01-0.4
APPROX COMP AUGITE;
TITANOMAGNETITE ( 7%)
Size(mm): TO 0.1
Alteration - CLAY MINERALS ( 35%)
Location: VESICLES, Replacing: GLASS,PLAG + CPX XTLLITES
Location: MESOSTASIS
ZEOLITE
SAME AS CLAY.MINS*
Vesicles -
Size(mm): 0.1-2.0
Percent: 5
Location: THROUGHOUT
Filling: CLAYS,ZEOLITES
Shape: IRREGULAR
CLAYS AND ZEOLITES LINE VESICLES*
Leg : 60 Top/Bottom Interval(mm): 30/ 50 Describer: Fryer, P.
Hole: 459B Top of Core Depth(m) : 644.00 Rock Type: IGNEOUS
Core: 69 Sample Midpoint(m) : 644.04 Sect/Pc #: 1/PCE 1
ROCK = APHYRIC BASALT
ALTERED,TWO DESCRIPTIONS FOR THIS SECTION-THIS ONE
WAS NOT USED IN ICD;
Texture: INTERSERTAL;
Where sampled: FLOW INTERIOR
AREA UNCERTAIN*
Groundmass - PLAGIOCLASE ( 27%)
Morphology: LATHS,SUBHEDRAL,GRANULAR
SLIGHT NORMAL ZONING,TWO SIZES-0.02 X 0.25 +
0.05 X 0.4;
GLASS ( 20%)
MOSTLY DEVITRIFIED,ALTERED TO CLAYS;
CLINOPYROXENE ( 16%)
Size(mm): 0.05-0.3 Morphology: GRANULAR
MAGNETITE ( 2%)
Size(mm): 0.01-0.09 Morphology: EUHEDRAL,SKELETAL
Alteration - CLAY MINERALS ( 15%)
Location: VESICLES, Replacing: GLASS
Location: MESOSTASIS
GREEN AND BROWN IN COLOR,LINES VESICLES*
ZEOLITE ( 5%)
Location: VESICLES
RADIAL CLUMPS;
CARBONATE ( 5%)
Location: VEINS
Vesicles -
Size(mm): 0.05-4.0
Percent: 10
Location: SCATTERED
Filling: CLAYS,ZEOLITES
Shape: IRREGULAR
Leg : 60 Top/Bottom Interval(mm): 30/ 50 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 644.00 Rock Type: IGNEOUS
Core: 69 Sample Midpoint(m) : 644.04 Sect/Pc #: 1/PCE 1
ROCK = APHYRIC BASALT
MICROPHYRIC BASALT,TWO DESCRIPTIONS FOR THIS
SECTION-THIS ONE USED IN ICD;
Texture: INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( TR%)
Size(mm): TO 0.7 Morphology: EUHEDRAL
APPROX COMP AN70(?),MICROPHENOS;
CLINOPYROXENE ( TR%)
Size(mm): TO 0.8 Morphology: EUHEDRAL
APPROX COMP AUGITE,MICROPHENOS*
Groundmass - GLASS ( 54%)
TOTALLY ALTERED;
PLAGIOCLASE ( 22%)
Size(mm): 0.03-0.5
APPROX COMP AN50-60(?);
CLINOPYROXENE ( 9%)
Size(mm): 0.01-0.3
APPROX COMP AUGITE;
TITANOMAGNETITE ( 5%)
Alteration - CARBONATE ( 1-3%)
Location: VESICLES, Replacing: GLASS,PYX
Location: MESOSTASIS
CLAY MINERALS ( 85%)
Location: VESICLES, Replacing: GLASS,PYX
Location: MESOSTASIS
ZEOLITE (10-12%)
Location: VESICLES, Replacing: GLASS,PYX
Location: MESOSTASIS
Vesicles -
Size(mm): 0.3-3.0
Percent: 10
Location: THROUGHOUT
Filling: CLAY,ZEOLITE,
Shape: IRREGULAR
Filling: CARB
CLAY, ZEOL + CARB ALSO LINE VESICLES*
Leg : 60 Top/Bottom Interval(mm): 330/ 340 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 644.00 Rock Type: IGNEOUS
Core: 69 Sample Midpoint(m) : 645.84 Sect/Pc #: 2/PCE 3B
ROCK = APHYRIC BASALT
FRACTURED BASALT;
Texture: HYALOPILITIC*
Groundmass - GLASS ( 60%)
BADLY ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): 0.05-0.5
APPROX COMP AN50-60;
CLINOPYROXENE ( 15%)
Size(mm): 0.05-0.3
APPROX COMP AUGITE;
MAGNETITE ( 5%)
Size(mm): TO 0.1
Alteration - CLAY MINERALS ( 40%)
Location: VESICLES, Replacing: GLASS,PYROXENES
Location: MESOSTASIS
Vesicles -
Size(mm): 0.2-1.0
Percent: 3-5
Location: THROUGHOUT
Filling: GREEN CLAY
Shape: IRREGULAR
Leg : 60 Top/Bottom Interval(mm): 410/ 420 Describer: Fryer, P.
Hole: 459B Top of Core Depth(m) : 653.50 Rock Type: IGNEOUS
Core: 70 Sample Midpoint(m) : 653.92 Sect/Pc #: 1/PCE 5
ROCK = APHYRIC BASALT;
Texture: INTERSERTAL;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.2-0.4
MINOR RESORPTION,SLIGHT NORMAL ZONING;
CLINOPYROXENE ( 1%)
Size(mm): 0.25-0.05 Morphology: ANHEDRAL
APPROX COMP AUGITE,HAS REACTION RIM OF FINE CPX*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 0.01-0.2 Morphology: LATH-SHAPED,TABULAR,SKELETAL
APPROX COMP AN50(?),FINER XTLS NEAR AREAS OF HIGH
VESICULARITY,MOST SHOW NORMAL ZONING;
CLINOPYROXENE ( 27%)
Size(mm): 0.01-0.09
GLASS ( 25%)
VERY LITTLE FRESH BROWN GLASS,MOST IS DEVITRIFIED
OR TOTALLY REPLACED BY CLAYS;
TITANOMAGNETITE ( 3%)
Size(mm): 0.01-0.03 Morphology: EUHEDRAL,CUBIC,GRANULAR
GRANULAR ONES ARE IN AGGREGATES;
ILMENITE ( 1%)
Size(mm): 0.01
MINUTE ELONGATE NEEDLES CONCENTRATED NEAR THE
VESICLES*
Alteration - CLAY MINERALS ( 15%)
Location: VEINS, Replacing: GLASS
Location: MESOSTASIS,
Location: LINE VESICLES
GENERALLY GREEN;
ZEOLITE ( 5%)
Location: MESOSTASIS,
Location: LINE VESICLES
OCCUR IN MESOSTASIS IN FINE-GRAINED AREAS*
Vesicles -
Size(mm): 0.05-0.5
Percent: 12
Location: SCATTERED,
Filling: CLAYS,ZEOLITES
Shape: IRREGULAR,
Location: ALIGNED
Shape: ELONGATE
SOME ALIGNED IN TRAINS,MOST SCATTERED,FILLED
PARTLY TO TOTALLY WITH CLAYS AND/OR ZEOLITES*
Leg : 60 Top/Bottom Interval(mm): 690/ 710 Describer: Fryer, P.
Hole: 459B Top of Core Depth(m) : 653.50 Rock Type: IGNEOUS
Core: 70 Sample Midpoint(m) : 654.20 Sect/Pc #: 1/PCE 6
ROCK = APHYRIC BASALT;
Texture: HYALOPILITIC;
Where sampled: INTERIOR OF HIGHLY SHEARED FLOW*
Phenocrysts- PLAGIOCLASE ( 2%)
Size(mm): 0.2-0.4
SHOWS SLIGHTLY RESORBED EDGES AND NORMAL ZONING;
CLINOPYROXENE ( 1%)
Size(mm): 0.05-0.2 Morphology: EUHEDRAL
APPROX COMP AUGITE,INTERGROWN WITH PLAG*
Groundmass - GLASS ( 50%)
ALTERED AND ALMOST WHOLLY DEVITRIFIED;
PLAGIOCLASE ( 20%)
Morphology: LATHS,GRANULAR
SIZES ARE 0.01X0.05-0.02X0.35,APPROX COMP AN50,
NORMAL ZONING;
CLINOPYROXENE ( 15%)
Size(mm): 0.01-0.04 Morphology: GRANULAR
APPROX COMP AUGITE,MOST IS ALTERED;
TITANOMAGNETITE ( 2%)
Size(mm): 0.01-0.03 Morphology: EUHEDRAL,CUBIC,GRANULAR
GRANULAR AGGREGATES,SCATTERED THROUGHOUT MATERIAL;
ILMENITE ( 1%)
IDENTITY UNCERTAIN,NEEDLES IN FINE-GRAINED REGIONS
NEAR VESICLES*
Alteration - CLAY MINERALS ( 35%)
Location: VESICLES, Replacing: GLASS
Location: MESOSTASIS
GREEN CLAY,LINE VESICLES*
Vesicles -
Size(mm): 0.05-1.0
Percent: 9
Location: SCATTERED, IN
Filling: CLAY.MINS
Shape: IRREGULAR
Location: TRAINS
TINY VESICLES ARE SCATTERED THROUGHOUT ROCK,LARGER
ONES ARE IN PARALLEL TRAINS SURROUNDED BY FINER
GRAINED MATRIX*
Leg : 60 Top/Bottom Interval(mm): 300/ 330 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 663.00 Rock Type: IGNEOUS
Core: 71 Sample Midpoint(m) : 663.32 Sect/Pc #: 1/PCE 4
ROCK = APHYRIC BASALT
SPARSELY MICROPHYRIC BASALT;
Texture: HYALOPILITIC*
Phenocrysts- PLAGIOCLASE ( 0.5%)
Size(mm): TO 1.5 Morphology: EUHEDRAL
SOMETIMES GLOMEROCRYSTS,APPROX COMP AN70;
CLINOPYROXENE ( 0.5%)
Size(mm): TO 0.8 Morphology: EUHEDRAL
SOMETIMES GLOMEROCRYSTS,APPROX COMP AUGITE*
Groundmass - GLASS ( 60%)
DEVITRIFIED AND ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): TO 0.3 Morphology: MICROLITIC
CLINOPYROXENE ( 10%)
Size(mm): TO 0.1 Morphology: MICROLITIC
TITANOMAGNETITE ( 5%)
Morphology: SKELETAL,IRREGULAR,GRANULAR
Alteration - CLAY MINERALS ( 36%)
Location: THROUGHOUT Replacing: GLASSY MATRIX,CPX GRAINS
ZEOLITE ( 4%)
Location: VESICLES Replacing: GLASSY MATRIX,CPX GRAINS
Vesicles -
Size(mm): 0.1-0.5
Percent: 5-7
Location: THROUGHOUT
Filling: CLAY
Shape: IRREGULAR
Leg : 60 Top/Bottom Interval(mm): 150/ 160 Describer: Fryer, P.
Hole: 459B Top of Core Depth(m) : 663.00 Rock Type: IGNEOUS
Core: 71 Sample Midpoint(m) : 664.66 Sect/Pc #: 2/PCE 1
ROCK = APHYRIC BASALT
SPARSELY MICROPHYRIC BASALT;
Texture: INTERSERTAL;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.3-0.5
SOME ZONING;
CLINOPYROXENE ( 1%)
Size(mm): TO 0.4 Morphology: ANHEDRAL
APPROX COMP AUGITE,ONE XTL WITH PLAG RESORBED AND
ROUNDED AND HAS HOUR GLASS EXTINCTION*
Groundmass - GLASS ( 10%)
DEVITRIFIED,SOME RELATIVELY FRESH BROWN GLASS;
PLAGIOCLASE ( 28%)
Morphology: LATHS
SIZE RANGES ARE 0.04X0.15-0.02X0.15;
CLINOPYROXENE ( 20%)
Size(mm): 0.01-0.08 Morphology: ANHEDRAL,ELONGATE,LATH-SHAPED
Morphology: EQUIGRANULAR
TITANOMAGNETITE ( 3%)
Size(mm): 0.03-0.13 Morphology: EUHEDRAL,CUBIC,SKELETAL
ILMENITE ( 1%)
IDENTITY UNCERTAIN,NEEDLE-LIKE OPAQUES COULD BE
ILMENITE*
Alteration - CLAY MINERALS ( 15%)
Location: MESOSTASIS, Replacing: GLASS
Location: VEINS,LINE +
Location: FILL VESICLES
GREEN AND BROWN IN COLOR;
ZEOLITE ( 5%)
Location: VESICLES,
Location: MESOSTASIS
RADIAL GROWTHS (MAY BE CLAY-LENGTH FAST);
CARBONATE ( 2%)
Location: VEINS
Vesicles -
Size(mm): 0.03-0.8
Percent: 15
Filling: CLAYS,ZEOLITES
CLAYS AND/OR ZEOLITE*
Leg : 60 Top/Bottom Interval(mm): 60/ 90 Describer: Sharaskin, A.
Hole: 459B Top of Core Depth(m) : 682.00 Rock Type: IGNEOUS
Core: 73 Sample Midpoint(m) : 682.08 Sect/Pc #: 1/
ROCK = APHYRIC BASALT
Texture: HYALOPILITIC*
Groundmass - GLASS ( 45%)
BADLY ALTERED;
PLAGIOCLASE ( 25%)
Size(mm): 0.05-0.8
APPROX COMP AN60(?);
CLINOPYROXENE ( 15%)
Size(mm): 0.01-0.5
TITANOMAGNETITE ( 5%)
Size(mm): TO 0.1
Alteration - CLAY MINERALS ( 40%)
Location: VESICLES, Replacing: GLASSY MATRIX,PYX
Location: INTERSTICES
PARTLY REPLACES PYROXENE;
ZEOLITE ( 5%)
SPHERULES OF ZEOLITE SURROUNDED BY CLAY RINDS*
Vesicles -
Size(mm): 0.05-0.8
Percent: 10
Location: THROUGHOUT
Filling: CLAY
Shape: ROUND TO
Shape: IRREGULAR
PARTLY FILLED BY CLAY*
Leg : 60 Top/Bottom Interval(mm): 1410/1440 Describer: Fryer, P.
Hole: 459B Top of Core Depth(m) : 682.00 Rock Type: IGNEOUS
Core: 73 Sample Midpoint(m) : 683.42 Sect/Pc #: 1/
ROCK = APHYRIC BASALT
SPARSELY MICROPHYRIC;
Texture: HYALOPILITIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): TO 0.5 Morphology: LATHS
RESORBED,SLIGHT NORMAL ZONING,MICROPHENOS*
Groundmass - GLASS ( 15%)
FRESH BROWN,MUCH IS ALTERED TO GREEN CLAYS;
PLAGIOCLASE ( 30%)
Size(mm): 0.01X0.2 Morphology: LATHS
APPROX COMP AN50;
CLINOPYROXENE ( 22%)
Size(mm): 0.01-0.07
PIGEONITIC(?);
TITANOMAGNETITE ( 2%)
TINY EUHEDRAL XTLS AND LUMPS OF AGGREGATES,SOME
THIN NEEDLES OF AN OPAQUE MINERAL CONCENTRATED IN
THE FINER GRAINED AREAS*
Alteration - CLAY MINERALS ( 20%)
Location: MESOSTASIS, Replacing: GLASS
Location: LINE VESICLES
GREEN COLOR*
Vesicles -
Size(mm): 0.02-0.3
Percent: 10
Location: SCATTERED,IN
Filling: CLAY.MINS
Shape: IRREGULAR
Location: TRAINS
ENCRUSTED WITH OR FILLED WITH CLAY,GRAIN SIZE OF
ROCK IN PROXIMITY TO VESICLES IS MUCH FINER*
Leg : 60 Top/Bottom Interval(mm): 1220/1250 Describer: Fryer, P.
Hole: 459B Top of Core Depth(m) : 682.00 Rock Type: IGNEOUS
Core: 73 Sample Midpoint(m) : 686.24 Sect/Pc #: 3/
ROCK = APHYRIC BASALT
SPARSELY MICROPHYRIC;
Texture: HYALOPILITIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 2%)
Size(mm): 0.3-0.5 Morphology: TABULAR-ELONGATE
SLIGHT RESORPTION,MINOR OSCILLATORY ZONING,APPROX
COMP AN55(?);
CLINOPYROXENE ( 1%)
Size(mm): 0.2-0.3 Morphology: SUBHEDRAL
APPROX COMP AUGITE(?)*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): 0.01-0.1 Morphology: LATHS
APPROX COMP AN50;
GLASS ( 10%)
FRESH BROWN,MOST IS ALTERED TO GREEN CLAY;
CLINOPYROXENE ( 15%)
Size(mm): 0.01-0.08 Morphology: ANHEDRAL
PIGEONITIC(?),SOMEWHAT ALTERED;
TITANOMAGNETITE ( 2%)
Size(mm): 0.01-0.02 Morphology: CUBIC,EUHEDRAL
ALSO AN ACICULAR OPAQUE MINERAL SCATTERED
THROUGHOUT*
Alteration - CLAY MINERALS ( 25%)
Location: MESOSTASIS,
Location: LINE VESICLES
GREEN BOTRYOIDAL VESICLE LINING*
Vesicles -
Size(mm): 0.5-1.5
Percent: 10
Location: SCATTERED,IN
Filling: CLAY-LINED
Shape: IRREGULAR
Location: TRAINS
LINED WITH BOTRYOIDAL GROWTHS OF GREEN CLAY*
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