Leg : 83 Top/Bottom Interval(mm): 1120/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 836.00 Rock Type: IGNEOUS
Core: 71 Sample Midpoint(m) : 837.12 Sect/Pc #: 1/PCE 12
ROCK = PLAG-CPX-OL-SPINEL PHYRIC BASALT;
Texture: PHYRIC,SUBVARIOLITIC;
Where sampled: GLASSY MARGIN*
Phenocrysts- OLIVINE ( 2%)
Size(mm): .8-2 Morphology: EUHEDRAL
REPLACED;
PLAGIOCLASE ( 3%)
Size(mm): .1-1 Morphology: EUHEDRAL
APPROX COMP AN79,SLIGHTLY NORMAL ZONING,LARGER
PHENOS+GLOMEROCRYSTS OFTEN SHOW SLIGHT
OSCILLATORY ZONING;
PLAGIOCLASE ( 7%)
Size(mm): 2.5 Morphology: GLOMEROCRYSTS+SYNNEUSIS
Morphology: GROWTH
SIZE IS UP TO 2.5MM IN DIAMETER,NOTE 2 TYPES PLAG;
CLINOPYROXENE ( 3%)
Size(mm): 4-1.5 Morphology: EUHEDRAL
APPROX COMP AUGITE;
SPINEL ( <1%)
Size(mm): .04-.2
APPROX COMP CHROMIUM SPINEL*
Groundmass - PLAGIOCLASE ( 80%)
Morphology: SUBVARIOLITIC
CENTERS OF VARIOLES HAVE BELT-BUCKLE OR HORNED
SHAPED XTLS OFF OF WHICH THE SPHERULITES XTLLIZE;
PYRITE
SOME GRAINS*
Alteration - CLAY MINERALS
Location: CRACKS Replacing: OL
DARK GREEN-SAPONITE?,REPLACES ALL OL XTLS AND
FILLS CRACKS*
Vesicles -
Percent: 0
Leg : 83 Top/Bottom Interval(mm): 190/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 843.50 Rock Type: IGNEOUS
Core: 72 Sample Midpoint(m) : 843.69 Sect/Pc #: 1/PCE 2
ROCK = PLAG-OL SPARSELY PHYRIC;
PILLOW BASALT;
Texture: SPARSELY PHYRIC,GLASSY-VARIOLITIC-SUBVARIOLITIC-
INTERGROWTH OF IMMATURE SHEAF+IMMATURE PLUMOSE*
Phenocrysts- OLIVINE ( 1%)
Size(mm): .5-2 Morphology: EUHEDRAL
REPLACED BY CHLORITE+LOW BIREFRINGENT-LOW RELIEF
MINERAL;
PLAGIOCLASE ( 1-2%)
Size(mm): .08-.4 Morphology: SUBHEDRAL-SKELETAL
NORMAL ZONING,HAS SKELETAL PROJECTIONS THAT FORM
QUENCH GROWTH,PHENOS ASSOCIATED WITH
CONCENTRATIONS OF OPAQUES*
Groundmass - OLIVINE ( 2-3%)
Morphology: EUHEDRAL
REPLACED;
PLAGIOCLASE (50-75%)
Morphology: VARIOLITIC
CLINOPYROXENE ( 0-60%)
Morphology: QUENCH PLUMES+SPHERULITES
APPROX COMP AUGITE,SIZES FOR PLAG+CPX DIFFICULT TO
ASSESS,ALL XTLLIZATION MAY BE PLAG AND THERE ARE
JUST TWO QUENCH MORPHOLOGIES-PLUMOSE+VARIOLITIC;
OPAQUE MINERALS
Size(mm): .08
INCLUDES MAGN+ILMENITE,OP.MINS
ASSOCIATED WITH PHENOS ARE LARGER THAN IN
GROUNDMASS,UPPER SIZE LIMIT DIFFICULT TO ESTIMATE
DUE TO CLUSTERS;
GLASS ( 5-80%)
PERCENTAGE DEPENDS ON POSITION FROM QUENCH MARGIN,
VARIOLES RANGE IN SIZE FROM .3MM TO PLAG SHEAFS
APPROX 1MM+CPX PLUMES APPROX .4MM ACROSS*
OUTER GLASSY RIM IS FRACTURED+ALTERATION/
DEVITRIFICATION HAS PROCEEDED HERE,LARGER AREAS OF
ALTERATION MAY BE CHLORITE*
Leg : 83 Top/Bottom Interval(mm): 710/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 843.50 Rock Type: IGNEOUS
Core: 72 Sample Midpoint(m) : 844.21 Sect/Pc #: 1/PCE 6
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,VERY FINE-GRAINED PLUMOSE
TEXTURE HAS APPROX EQUIGRANULAR APPEARANCE;
Where sampled: DIKE MARGIN*
Phenocrysts- OLIVINE ( <1%)
Size(mm): .2-1 Morphology: EUHEDRAL-SUBHEDRAL
TOTALLY REPLACED BY SMECTITE?,PARTIALLY RESORBED;
PLAGIOCLASE ( 3%)
Size(mm): .2-1.5 Morphology: SUBHEDRAL
NORMAL ZONED,RELATIVELY UNALTERED,OCCURS IN
GLOMEROCRYSTS;
CLINOPYROXENE ( 1%)
Size(mm): .3-.8 Morphology: ANHEDRAL
APPROX COMP AUGITE,FRESH,ROUNDED EDGES*
Groundmass - OLIVINE ( 1-2%)
Size(mm): .08-.2 Morphology: EUHEDRAL
TOTALLY REPLACED BY SMECTITE;
PLAGIOCLASE+CLINOPYROXENE
DIFFICULT TO ESTIMATE PLAG/CPX RATIO DUE TO FINE
NATURE OF QUENCH GROUNDMASS TEXTURE-PLAG DOES FORM
APPROX 3-5% MICROLITES IN GROUNDMASS(.02-.05MM
WIDE);
OPAQUE MINERALS ( <1%)
INCLUDES MAGN+ILMENITE,VERY FINE GRAIN SIZE(<.01
MM) DISSEMINATED AMONG QUENCH GROUNDMASS
XTLLIZATION;
SPINEL ( TR%)
Size(mm): .08 Morphology: ANHEDRAL
CHROMIUM SPINEL,ROUNDED EDGES*
Alteration - SAPONITE ( 1-2%)
Replacing: OL
ID UNCERTAIN FOR SAPONITE*
Leg : 83 Top/Bottom Interval(mm): 570/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 843.50 Rock Type: IGNEOUS
Core: 72 Sample Midpoint(m) : 845.57 Sect/Pc #: 2/PCE 5
ROCK = PLAG-OL-CPX-SPINEL PHYRIC BASALT;
Texture: PHYRIC,SUBOPHITIC,MEDIUM-GRAINED;
Where sampled: DIKE OR PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 3-4%)
Size(mm): .8-4.4 Morphology: EUHEDRAL
PLAGIOCLASE ( 12%)
Size(mm): .4-2 Morphology: EUHEDRAL
APPROX COMP AN72,LARGER PHENO SIZE XTLS MOST
COMMONLY IN GLOMEROCRYST AGGREGATES,WITH OL;
PLAGIOCLASE
Morphology: GLOMEROCRYSTS
OSCILLATORY ZONING,OL+CPX OCCUR WITH PLAG IN
AGGREGATES,NOTE TWO TYPES PLAG;
CLINOPYROXENE ( 1%)
Size(mm): 1-1.2
APPROX COMP AUGITE;
SPINEL ( TR%)
Size(mm): .2
APPROX COMP CHROMIUM SPINEL*
Groundmass - OLIVINE ( 2%)
Size(mm): .10 Morphology: EUHEDRAL
PLAGIOCLASE ( 40%)
Size(mm): .1-.5 Morphology: EUHEDRAL
APPROX COMP AN65-70,OCCURS IN RADIAL AGGREGATES
(MATURE PLUMOSE);
CLINOPYROXENE ( 35%)
Size(mm): .05-.30 Morphology: ANHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 3%)
Size(mm): .025-.05 Morphology: EUHEDRAL
SPINEL ( <<1%)
Morphology: EUHEDRAL
CHROMIUM SPINEL,DISSEMINATED THROUGHOUT ROCK;
SULFIDES ( <1%)
Morphology: ANHEDRAL
DISSEMINATED*
Alteration - CLAY MINERALS
Replacing: OL MICROPHENOS+PHENOS
DARK GREEN+LIGHT GREEN,SAME CONCENTRIC ARRANGEMENT
ALREADY OBSERVED IN LEG 70-DARK GREEN CLAY IN
CENTER SURROUNDED BY LIGHT GREEN CLAY WITH OPAQUE
INCLUSIONS;
OPAQUE MINERALS
Location: IN OL PHENOS
Vesicles -
Percent: 0
Leg : 83 Top/Bottom Interval(mm): 760/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 843.50 Rock Type: IGNEOUS
Core: 72 Sample Midpoint(m) : 847.26 Sect/Pc #: 3/PCE 5
ROCK = OL-PLAG-CPX-SPINEL PHYRIC BASALT;
Texture: PHYRIC,SUBOPHITIC,FINE-GRAINED(INTERGRANULAR);
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): .4-2.6 Morphology: EUHEDRAL
REPLACED;
PLAGIOCLASE ( 2%)
Size(mm): .2-2 Morphology: EUHEDRAL
APPROX COMP AN83,SLIGHT OSCILLATORY ZONING;
PLAGIOCLASE ( 3%)
Size(mm): 2.5 Morphology: GLOMEROCRYSTS
SIZE IS UP TO 2.5MM DIAMETER,NOTE TWO TYPES PLAG;
CLINOPYROXENE ( <1%)
Size(mm): 1.4 Morphology: SUBHEDRAL
APPROX COMP AUGITE,OFTEN OCCURS IN GLOMEROCRYSTIC
AGGREGATES WITH PLAG;
SPINEL ( TR%)
Size(mm): .01 Morphology: EUHEDRAL
CHROMIUM SPINEL*
Groundmass - OLIVINE ( 2%)
Size(mm): .04-.16 Morphology: SUBHEDRAL-EUHEDRAL
ALTERED;
PLAGIOCLASE ( 50%)
Size(mm): <.01 Morphology: IMMATURE SHEAF
APPROX COMP NOT DETERMINED;
CLINOPYROXENE ( 45%)
Size(mm): <.1
APPROX COMP AUGITE;
MAGNETITE ( 3%)
Size(mm): .04 Morphology: EUHEDRAL
Alteration - CLAY MINERALS
Location: CRACKS Replacing: OL
DARK GREEN*
Vesicles -
Percent: 0
Leg : 83 Top/Bottom Interval(mm): 1300/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 852.50 Rock Type: IGNEOUS
Core: 73 Sample Midpoint(m) : 853.80 Sect/Pc #: 1/PCE 8
ROCK = PLAG-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,SUBOPHITIC;
Where sampled: DIKE
WS UNCERTAIN*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 1-2 Morphology: EUHEDRAL
TOTALLY ALTERED;
PLAGIOCLASE ( 3%)
Size(mm): .8-1.5 Morphology: EUHEDRAL
APPROX COMP AN72,NORMAL TO OSCILLATORY ZONING-SOME
WITH DISTINCT CORE/RIM,MUCH OF PLAG AND ALL OF CPX
OF PHENO SIZE ACTUALLY OCCURS AS AGGREGATES IN
SUBOPHITIC RELATIONS,THESE LARGE XTLS ARE
GENERALLY STARTING TO BE RESORBED=DISEQUILIBRIUM*
Groundmass - OLIVINE ( 10%)
Morphology: EUHEDRAL
PLAGIOCLASE ( 45%)
Morphology: EUHEDRAL
APPROX COMP AN63,FORMS TYPICAL RADIATE PATTERNS;
CLINOPYROXENE ( 35%)
Morphology: ANHEDRAL
APPROX COMP AUGITE;
OTHER
OPAQUES+FE.TI.OXIDES STILL PRESENT;
SULFIDES ( <1%)
Morphology: ANHEDRAL
INCLUDES PYRITE*
Alteration - CLAY MINERALS ( 1%)
Location: INTERSTICES Replacing: OL
DARK GREEN-SAPONITE?*
Vesicles -
Percent: 0
Leg : 83 Top/Bottom Interval(mm): 860/ 0 Describer: damson, A.C.
Hole: 504B Top of Core Depth(m) : 852.50 Rock Type: IGNEOUS
Core: 73 Sample Midpoint(m) : 854.86 Sect/Pc #: 2/PCE 7
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PHYRIC,SUBOPHITIC,FINE-GRAINED;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 2%)
Size(mm): .8-2.2 Morphology: EUHEDRAL
REPLACED;
PLAGIOCLASE ( 1%)
Size(mm): 1.2-2 Morphology: EUHEDRAL
APPROX COMP AN82,LIMITED ZONING-NORMAL TO SLIGHTLY
OSCILLATORY;
PLAGIOCLASE ( 2%)
Size(mm): .5-.8 Morphology: EUHEDRAL
APPROX COMP AN76,SMALLER PHASE OF PHENOS;
PLAGIOCLASE ( 2%)
Size(mm): 2 Morphology: GLOMEROCRYSTS
APPROX COMP AN72,SIZE IS FOR DIAMETER,NOTE THREE
TYPES PLAG*
Groundmass - OLIVINE ( 2-3%)
Size(mm): .1-.2 Morphology: EUHEDRAL
REPLACED;
PLAGIOCLASE ( 40%)
Size(mm): <.3 Morphology: SUBHEDRAL
NORMAL ZONING,APPROX COMP AN72;
CLINOPYROXENE ( 40%)
Size(mm): <.2 Morphology: ANHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 3%)
Size(mm): .01-.1 Morphology: EUHEDRAL
FRESH,GROUNDMASS TEXTURE AND GRAIN SIZE VARY ON
THE SCALE OF MM-RANGING FROM VERY FINE GRANULAR TO
SUBOPHITIC*
Alteration - CLAY MINERALS
Location: CRACKS,OL Replacing: OL PHENOS
Location: PHENOS
DARK GREEN-POSSIBLY SAPONITE;
SULFIDE
Location: NEAR+INSIDE
Location: OLD OL PHENO
INCLUDES PYRITE+SOME GRAINS OF CHALCOPYRITE*
Leg : 83 Top/Bottom Interval(mm): 1190/1210 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 870.50 Rock Type: IGNEOUS
Core: 75 Sample Midpoint(m) : 871.70 Sect/Pc #: 1/PCE 6
ROCK = PLAG-OL-CPX MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,FINE-GRAINED,SUBOPHITIC WITH
GLOMEROCRYSTS*
Phenocrysts- OLIVINE ( .5%)
Size(mm): .3-.4
COMPLETELY REPLACED;
PLAGIOCLASE ( 3%)
Size(mm): .4-1.2 Morphology: EUHEDRAL
GLOMEROCRYSTS;
CLINOPYROXENE ( <.5%)
Size(mm): .6-.8
Groundmass - OLIVINE ( 7%)
Size(mm): .02 Morphology: SUBHEDRAL
PLAGIOCLASE ( 42%)
Size(mm): .02-.3 Morphology: LATH;BELT-BUCKLE
CLINOPYROXENE ( 38%)
Size(mm): .01-.2
PLUMOSE LIKE TEXTURE CONTROLLED BY THE FELDSPAR
LATHS;
TITANOMAGNETITE ( 9%)
TI-MAGN IS PRESENT BUT MAY BE ILMENITE ALSO-HAS AN
ELONGATE SKELETAL MORPHOLOGY;
SULFIDES
SOME GRAINS OF PYRITE*
Alteration - CLAY MINERALS
Location: VEIN,OL Replacing: OL
MAY INCLUDE CHLORITE;
OPAQUE MINERAL
Replacing: OL
ASSOCIATED WITH CHLORITE?*
Vesicles -
Percent: 0
Leg : 83 Top/Bottom Interval(mm): 710/ 740 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 888.50 Rock Type: IGNEOUS
Core: 77 Sample Midpoint(m) : 889.23 Sect/Pc #: 1/PCE 4
ROCK = APHYRIC BASALT;
Texture: APHYRIC,MEDIUM-GRAINED,INTERSERTAL-SUBOPHITIC
SUBOPHITIC DOMINATES OVER INTERSERTAL;
Where sampled: PILLOW INTERIOR-FLOW INTERIOR
WS UNCERTAIN*
Groundmass - OLIVINE ( 13%)
Size(mm): .2-.4 Morphology: EUHEDRAL
REPLACED BY DARK GREEN CLAY;
PLAGIOCLASE ( 40%)
Size(mm): .1X1.6 Morphology: EUHEDRAL LATHS
TWO SIZE RANGES FOR PLAG-OTHER IS .1X1MM;
CLINOPYROXENE ( 40%)
Size(mm): .2-1.2 Morphology: ANHEDRAL-SUBHEDRAL
APPROX COMP AUGITE?;
OPAQUE MINERALS ( 7%)
Size(mm): .05X.05 Morphology: AGGREGATED GRAINS
INCLUDES MAGN+ILMENITE,TI-MAGN STILL PRESENT BUT
BEGINNING ALTERATION;
PYRITE
GRAINS,APPROX COMP FES2*
Alteration - CLAY MINERALS
Replacing: OL
DARK GREEN CLAY MATERIAL*
Vesicles -
Percent: 0
Leg : 83 Top/Bottom Interval(mm): 1230/1260 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 888.50 Rock Type: IGNEOUS
Core: 77 Sample Midpoint(m) : 891.24 Sect/Pc #: 2/
ROCK = APHYRIC BASALT;
Texture: APHYRIC,SUBOPHITIC,MEDIUM-GRAINED;
Where sampled: PILLOW INTERIOR-FLOW INTERIOR
WS UNCERTAIN*
Groundmass - OLIVINE ( 10%)
Size(mm): .2-.6 Morphology: ANHEDRAL-SUBHEDRAL
COMPLETELY REPLACED BY CHLORITE? OR SERPENTINITE?;
PLAGIOCLASE ( 42%)
Size(mm): .1-.8 Morphology: SUBHEDRAL LATHS
PARTLY REPLACED BY LIGHT GREEN CLAY(CHLORITE?)+?;
CLINOPYROXENE ( 43%)
Size(mm): .1-.4 Morphology: ANHEDRAL
APPROX COMP AUGITE;
TITANOMAGNETITE ( 5%)
Size(mm): .05-.08 Morphology: SUBHEDRAL
PYRITE
VERY FEW GRAINS*
Alteration - CLAY MINERALS
Replacing: OL,PARTS OF PLAG
INCLUDES CHLORITE?;
OTHER
GRANULAR-HIGH BIREFRINGENT MATERIAL(EPIDOTE?-TOO
SMALL TO SAY),ASSOCIATED WITH PROBABLY CHLORITE*
Vesicles -
Percent: 0
Leg : 83 Top/Bottom Interval(mm): 750/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 897.50 Rock Type: UNIDENTIFIED
Core: 78 Sample Midpoint(m) : 898.25 Sect/Pc #: 1/PCE 3E
ROCK = BASALTIC BRECCIA;
Texture: APHYRIC
APHYRIC BASALT ELEMENTS IN A MATRIX/VEINS OF
CHLORITE AND XTL SHARDS;
Where sampled: NEXT TO GLASSY MARGIN
WS DIFFICULT TO ASSESS*
APHYRIC BASALT:;
Groundmass - OLIVINE ( 3%)
Size(mm): .3-.4 Morphology: EUHEDRAL
COMPLETELY REPLACED;
PLAGIOCLASE ( 40%)
Size(mm): .2-.8 Morphology: SUBHEDRAL
RAGGED XTL CORES,PROBABLE ALBITE REPLACEMENT,SOME
CHLORITE;
CLINOPYROXENE
Size(mm): .2-.8 Morphology: ANHEDRAL
APPROX COMP AUGITE;
OPAQUE MINERALS ( 3%)
Size(mm): .1-.4 Morphology: ANHEDRAL
CHLORITE ( 3%)
Size(mm): <1
INTERSTITIAL TO PLAG+CPX;
MATRIX/VEINS:;
PLAGIOCLASE ( 35%)
Size(mm): .05-.2
ANGULAR CRYSTAL FRAGMENTS IN A MATRIX OF CHLORITE;
CLINOPYROXENE ( 30%)
APPROX COMP AUGITE,BROWNISH BREAKDOWN ALTERATION
AT RIMS;
OPAQUE MINERALS ( 5%)
INCLUDES MAGN+ILMENITE,TI-MAGN ALMOST COMPLETELY
ALTERED-ONLY FEW FRESH RELICTS;
CHLORITE (25-30%)
IN BASALT:;
Alteration - CLAY MINERALS
Location: VEINS, Replacing: OL,SOME PLAG
Location: INTERSTITIAL
INCLUDES CHLORITE?;
PYRITE
Location: DISSEMINATED
Location: THROUGH ROCK
Leg : 83 Top/Bottom Interval(mm): 320/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 897.50 Rock Type: IGNEOUS
Core: 78 Sample Midpoint(m) : 899.32 Sect/Pc #: 2/PCE 1F
ROCK = PLAG-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,VERY DENSE IMMATURE SHEAF;
Where sampled: DIKE CONTACT-DIKE/INTRUSIVE MATERIAL
CONTACT INTRUSIVE DUE TO OCCURENCE OF CLASTS OF
HOST IN GLASSY BORDER AND GLASS "FINGERS" IN HOST
BASALT*
Phenocrysts- OLIVINE ( 1%)
Size(mm): .8-1.2 Morphology: EUHEDRAL
TOTALLY REPLACED BY CHLORITE;
PLAGIOCLASE ( 4%)
Size(mm): .15-1.6 Morphology: EUHEDRAL
PARTIALLY REPLACED BY CHLORITE ALONG FRACTURES,
OCCURS COMMONLY IN GLOMEROCRYSTIC AGGREGATES*
Groundmass - PLAGIOCLASE+CLINOPYROXENE (90-95%)
Size(mm): <.005 Morphology: SHEAF QUENCH TEXTURE
DIFFICULT TO ASSESS PERCENTAGE OF PLAG AND CPX DUE
TO QUENCH MORPHOLOGY;
OPAQUE MINERALS ( 1%)
Size(mm): <.01 Morphology: EQUANT
OPAQUE MINERALS ( <1%)
Size(mm): .1-.4
OP.MINS BIMODAL,INCLUDES MAGN+ILMENITE,DISPERSED
BETWEEN SHEAF XTLS*
Alteration - CLAY MINERALS ( 1%)
Replacing: OL
INCLUDES CHLORITE-STRONG GREEN COLOR,PLEOCHROIC IN
YELLOW TO GREEN*
Leg : 83 Top/Bottom Interval(mm): 321/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 897.50 Rock Type: IGNEOUS
Core: 78 Sample Midpoint(m) : 899.32 Sect/Pc #: 2/PCE 1F
ROCK = APHYRIC BASALT;
Texture: APHYRIC,MEDIUM-GRAINED,SUBOPHITIC
RARE OL PHENOS PRESENT;
Where sampled: DIKE CONTACT-HOST MATERIAL*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 1.5
TOTALLY REPLACED BY CHLORITE*
Groundmass - OLIVINE ( 5%)
SIZE RANGE UNKNOWN,TOTALLY REPLACED-MAY BE
INTERSTITIAL CHLORITE;
PLAGIOCLASE ( 40%)
Size(mm): .02-1.5 Morphology: LATHS-SUBHEDRAL
PARTIALLY ALTERED;
CLINOPYROXENE ( 45%)
Size(mm): .08-.5 Morphology: ANHEDRAL
MAY BE TI-RICH,SLIGHTLY ZONED,APPROX COMP AUGITE,
OPAQUE MINERALS ( 1%)
Size(mm): .04-.2 Morphology: EQUANT SUBHEDRAL
INCLUDES MAGN+ILMENITE,SLIGHTLY REPLACED-OXIDES
LAST TO XTLLIZE AS THEY ARE ALWAYS INTERSTITIAL*
THERE IS A SMALL FINGER OF GLASS WHICH INTRUDES
THE HOST AND EXISTS AS A REXTLLIZED VARIOLE;
Alteration - PYRITE ( TR%)
Location: VEINS
IN VEINS WITH CHLORITE;
CHLORITE ( 10%)
Location: INTERSTICES,
Location: VEINS,DIFFUSE
Location: PATCHES
MAY BE COALESCED INTERSTITIAL REPLACEMENT, ONE
VEIN HAD ASSOCIATED LAUMONTITE*
Leg : 83 Top/Bottom Interval(mm): 790/ 810 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 897.50 Rock Type: IGNEOUS
Core: 78 Sample Midpoint(m) : 899.80 Sect/Pc #: 2/PCE 1M
ROCK = OL-PLAG SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,SUBOPHITIC,MEDIUM-GRAINED;
Where sampled: DIKE
WS UNCERTAIN*
Phenocrysts- OLIVINE ( 1%)
Size(mm): .8-2.5 Morphology: EUHEDRAL
PLAGIOCLASE ( .5%)
Size(mm): .5-1.2 Morphology: EUHEDRAL
PARTLY ALTERED TO GREEN CLAY+OTHER FELDSPAR?+
ANOTHER CLAY?*
Groundmass - OLIVINE ( 10%)
Size(mm): .2X.2 Morphology: ANHEDRAL
IN SPACES BETWEEN PLAG LATH+PYX XTLS;
PLAGIOCLASE ( 42%)
Size(mm): .08-.4 Morphology: LATHS
PARTLY ALTERED TO GREEN CLAY AND POSSIBLY ANOTHER
FELDSPAR;
CLINOPYROXENE ( 41%)
Size(mm): .1-.6 Morphology: SUBHEDRAL
APPROX COMP AUGITE;
TITANOMAGNETITE ( 5.5%)
Size(mm): .02-.05
GRAINS,LOCATED BETWEEN PLAG LATHS*
Alteration - CLAY MINERALS
Replacing: OL,PLAG
DARK GREEN;
OPAQUE MINERALS
Replacing: OL
Vesicles -
Percent: 0
Leg : 83 Top/Bottom Interval(mm): 990/ 0 Describer: Emmermann, R.
Hole: 504B Top of Core Depth(m) : 904.50 Rock Type: IGNEOUS
Core: 79 Sample Midpoint(m) : 905.49 Sect/Pc #: 1/PCE 14
ROCK = OL-PLAG SPARSELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: SPARSELY PHYRIC,INTERGRANULAR-INTERSERTAL
(QUENCH),FINE-GRAINED;
Where sampled: DIKE
WS UNCERTAIN*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 1-2.4 Morphology: EUHEDRAL
COMPLETELY ALTERED;
PLAGIOCLASE ( 1%)
Size(mm): <1 Morphology: SUBHEDRAL
SOMETIMES GLOMEROCRYSTS,PARTIALLY ALTERED,CHROMIUM
SPINEL MAY BE PRESENT AS PHENOS*
Groundmass - OLIVINE ( 1%)
Size(mm): <.5
COMPLETELY ALTERED;
PLAGIOCLASE ( 60%)
Size(mm): <1 Morphology: LATH SHAPED-SKELETAL
CLINOPYROXENE ( 33%)
Size(mm): <1 Morphology: ANHEDRAL-SHEAF
QUENCH TEXTURES;
OPAQUE MINERALS ( 5%)
Size(mm): <.5 Morphology: EUHEDRAL-ANHEDRAL
INCLUDES MAGN+ILMENITE,HAS TO BE CHECKED IN
REFLECTED LIGHT,FEW RELICTIC GRAINS,SPHENE IS
PRESENT IN VERY SMALL GRAINS;
OTHER ( 2%)
Morphology: ANHEDRAL
BROWNISH ALTERATION PRODUCTS REPLACING GLASS;
SPINEL ( <<1%)
CHROMIUM SPINEL,SMALL GRAINS,DISSEMINATED
THROUGHOUT ROCK*
Alteration - CLAY MINERALS
Replacing: GLASS
BROWNISH,PERCENTAGE UNKNOWN;
OTHER ( <1%)
Replacing: SULFIDES
CHLORITE
Replacing: OL
Vesicles -
Percent: 0
Leg : 83 Top/Bottom Interval(mm): 1330/ 0 Describer: Emmermann, R.
Hole: 504B Top of Core Depth(m) : 910.00 Rock Type: IGNEOUS
Core: 80 Sample Midpoint(m) : 914.33 Sect/Pc #: 3/PCE 8F
ROCK = PLAG-OL-SPINEL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,VERY FINE-GRAINED;
Where sampled: NEXT TO GLASSY MARGIN OR PILLOW INTERIOR*
Phenocrysts- OLIVINE ( <1%)
Size(mm): <1 Morphology: EUHEDRAL
COMPLETELY REPLACED BY CHLORITE;
PLAGIOCLASE ( <2%)
Size(mm): <1 Morphology: SUBHEDRAL
PARTIALLY ALTERED BY LOWER RELIEF,LOWER
BIREFRINGENT MATERIAL;
SPINEL ( <<1%)
Morphology: SUBHEDRAL-EUHEDRAL
APPROX COMP CHROMIUM SPINEL,MICROPHENOS*
GROUNDMASS VERY FINE-GRAINED;
Groundmass - PLAGIOCLASE ( 60%)
Size(mm): <<1 Morphology: LATHY-SKELETAL
INTERSERTAL,QUENCH TEXTURES;
CLINOPYROXENE ( 30%)
Size(mm): <<1 Morphology: SHEAF
INTERSERTAL,QUENCH TEXTURES;
OPAQUE MINERALS ( 5%)
Size(mm): <<1
INCLUDES MAGN+ILMENITE,HAS TO BE CHECKED IN
REFLECTED LIGHT,FEW RELICTS PRESENT;
SULFIDES ( 1%)
DISSEMINATED THROUGHOUT ROCK;
SPINEL ( <<1%)
Morphology: EUHEDRAL
CHROMIUM SPINEL,FEW GRAINS*
Alteration - QUARTZ ( <<1%)
Replacing: SOME GRAINS
CHLORITE
Replacing: OL PHENOS
Leg : 83 Top/Bottom Interval(mm): 50/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 910.00 Rock Type: IGNEOUS
Core: 80 Sample Midpoint(m) : 914.55 Sect/Pc #: 4/PCE 1B
ROCK = PLAG-OL-SPINEL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC
VARIES FROM BRECCIATED(WITH CLASTS OF
SUBVARIOLITIC BASALT) TO SUBVARIOLITIC TO DENSE
VERY FINE-GRAINED INTERGROWTH OF IMMATURE PLUMOSE+
SHEAF TEXTURES;
Where sampled: GLASSY MARGIN-NEXT TO GLASSY MARGIN-PILLOW MARGIN
-BRECCIATED RIM*
Phenocrysts- OLIVINE ( 1%)
PARTIALLY TO TOTALLY ALTERED BY CHLORITE;
PLAGIOCLASE ( 5%)
Size(mm): .2-1.2
EXTENSIVELY REPLACED BY A LOW BIREFRINGENT-LOW
RELIEF MINERAL,PATCHY APPEARANCE,NORMAL ZONING,
PLAG OF PHENO SIZE(.4-1.5MM) EXISTS COMMONLY AS
GLOMEROCRYSTIC AGGREGATES;
SPINEL ( TR%)
Size(mm): .2 Morphology: EUHEDRAL-SUBHEDRAL
APPROX COMP CHROMIUM SPINEL*
Groundmass - PLAGIOCLASE ( 5%)
Morphology: SKELETAL MICROLITE LATHS
NORMAL ZONING,NUMBER OF MICROLITES INCREASES AWAY
FROM THE BORDER;
OTHER ( 80%)
GROUNDMASS CONSISTS OF DENSE INTERGROWTH OF
IMMATURE SHEAF+PLUMOSE STRUCTURE,PERCENTAGE OF
PLAG/CPX DIFFICULT TO ASSESS*
VEINS-IN BORDER BRECCIATED ZONE CONSIST OF QUARTZ
+LAUMONTITE+CHLORITE,FURTHER INTO HOST ROCK VEINS
BECOME EXCLUSIVELY CHLORITE WITH MINOR QUARTZ AT
BORDERS,VEINS TRUNCATE XTLS;
Alteration - CHLORITE ( 10%)
Location: VEINS Replacing: OL
LAUMONTITE ( 3%)
Location: VEINS
PYRITE ( <1%)
Location: DISSEMINATED
Location: THROUGH ROCK
Leg : 83 Top/Bottom Interval(mm): 820/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 919.50 Rock Type: IGNEOUS
Core: 81 Sample Midpoint(m) : 920.32 Sect/Pc #: 1/PCE 10
ROCK = PLAG MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,GLASSY-VARIOLITIC-
SUBVARIOLITIC-DENSE IMMATURE PLUMOSE;
Where sampled: GLASSY MARGIN-PILLOW MARGIN*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): .1-1.6 Morphology: SUBHEDRAL
OCCURS COMMONLY IN GLOMEROCRYSTS,TOTALLY REPLACED
BY COLORLESS-LOW BIREFRINGENT-LOW RELIEF MINERAL
(ALBITE?)-COULD BE LAUMONTITE,XENOLITH IN BORDER
ZONE OF PLAG+CPX MAKES ASSESSMENT OF PHENO CONTENT
DIFFICULT SINCE SOME PLAG MAY BE OF DISAGGREGATED
XENOLITHS*
Groundmass - PLAGIOCLASE ( 1%)
Size(mm): <.02 Morphology: SKELETAL MICROLITES
AT CENTERS OF SPHERULITES;
OTHER (90-95%)
QUENCH GROUNDMASS-MOST OF GROUNDMASS IS QUENCH
XTLLIZATION VARYING FROM GLASS TO VARIOLITIC
TEXTURES,FURTHER FROM BORDER TEXTURE BECOMES
COARSER AND LOOKS LIKE A DENSE,VERY FINE-GRAINED
IMMATURE SHEAF OR PLUMOSE TEXTURE*
XENOLITHS-PLAG+CPX IN SUBOPHITIC INTERGROWTH,
PARTIALLY RESORBED;
Alteration - CHLORITE
Location: VEINS
LAUMONTITE
Location: VEINS
OCCURS IN VEINS THAT EITHER CROSS OR INTRUDE
CENTER OF CHLORITE VEINS;
PYRITE
Location: DISSEMINATED
Location: THROUGH ROCK
Leg : 83 Top/Bottom Interval(mm): 450/ 0 Describer: Alt, J.C.
Hole: 504B Top of Core Depth(m) : 928.50 Rock Type: IGNEOUS
Core: 82 Sample Midpoint(m) : 928.95 Sect/Pc #: 1/PCE 4B
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: INTERGRANULAR-SUBOPHITIC,PHYRIC;
Where sampled: PILLOW INTERIOR*
N<PLAG,BIAXIAL(-),2V=65;
Phenocrysts- OLIVINE ( 1%)
Size(mm): .2-1.2 Morphology: EUHEDRAL
RIMMED+INTERSPERSED WITH QUARTZ,CORE REPLACED WITH
CHLORITE;
PLAGIOCLASE ( 10%)
Size(mm): .2-1.2 Morphology: TABULAR
PARTLY REPLACED WITH CALCITE+CHLORITE+QUARTZ+
ALBITE;
CLINOPYROXENE ( 1%)
Size(mm): .2-.4 Morphology: EQUANT
UNALTERED,OCCURS IN SUBOPHITIC INTERGROWTHS WITH
PLAG*
Groundmass - PLAGIOCLASE
Size(mm): .05X.3 Morphology: PRISMATIC-LATHS
PARTLY ALTERED TO CHLORITE+ZEOLITE?;
CLINOPYROXENE
Size(mm): .1-.2 Morphology: EQUANT-LATHS
OPAQUE MINERALS
INCLUDES MAGN+ILMENITE,SOME RELICTS PRESENT;
SPHENE
COMMON DISSEMINATED;
PYRITE
DISSEMINATED*
Alteration - CARBONATE
Location: VEINS
INTERGROWN WITH QUARTZ;
CLAY MINERALS
Location: CHLORITE VEIN Replacing: OL
INCLUDES BROWN CHLORITE;
ZEOLITE
+SPHENE?;
OTHER
Location: QUARTZ VEINS
QUARTZ VEINS- CUT CHLORITE VEINS+LINE WALLS OF
CHLORITE VEINS*
Leg : 83 Top/Bottom Interval(mm): 720/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 928.50 Rock Type: IGNEOUS
Core: 82 Sample Midpoint(m) : 930.72 Sect/Pc #: 2/PCE 6C
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,GLASSY-SUBVARIOLITIC-
VARIOLITIC
82-2-72 AND 82-2-75 QUENCH TOWARD SAME GLASSY
MARGIN*
Phenocrysts- OLIVINE ( <1%)
Size(mm): .2-.3 Morphology: EUHEDRAL
TOTALLY REPLACED BY CHLORITE;
PLAGIOCLASE ( 5%)
Size(mm): .3-1.2 Morphology: SUBHEDRAL
SUBHEDRAL WITH QUENCH EXTENSIONS,TOTALLY REPLACED
BY ALBITE(?),RIMS INTACT;
CLINOPYROXENE ( 1%)
Size(mm): .2-.4 Morphology: ANHEDRAL
APPROX COMP AUGITE,FRESH,MAY BE COGNATE
INCLUSIONS*
Groundmass - PLAGIOCLASE+CLINOPYROXENE ( <5%)
Size(mm): <.02 Morphology: SKELETAL MICROLITES
NORMAL ZONING,GROUNDMASS PREDOMINANTLY A
SPHERULITIC INTERGROWTH OF CPX+PLAG,OUTER BORDER
IS GLASS,ANGULAR FRACTURES,ALTERATION HAS A
CONCENTRIC PATTERN,PROBABLY SOME SMECTITE*
VEINS-NUMEROUS VEINS OCCUR-EPIDOTE + OR - QUARTZ
CROSSCUTS VEINS OF CHLORITE+QUARTZ;
Alteration - CHLORITE
Location: VEINS Replacing: PLAG
PYRITE
Location: DISSEMINATED
Location: THROUGH ROCK
Leg : 83 Top/Bottom Interval(mm): 750/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 928.50 Rock Type: IGNEOUS
Core: 82 Sample Midpoint(m) : 930.75 Sect/Pc #: 2/PCE 6D
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,GLASSY-SUBVARIOLITIC-
VARIOLITIC;
Where sampled: PILLOW MARGIN
82-2-75 AND 82-2-72 QUENCH TOWARD THE SAME GLASSY
MARGIN*
Phenocrysts- OLIVINE ( <1%)
Size(mm): .2-.3 Morphology: EUHEDRAL
TOTALLY REPLACED;
PLAGIOCLASE ( 5%)
Size(mm): .3-1.2 Morphology: SUBHEDRAL
QUENCH XTLLIZATION AT RIMS,PARTIALLY TO TOTALLY
REPLACED BY LAUMONTITE;
CLINOPYROXENE ( 1%)
Size(mm): .2-.4 Morphology: ANHEDRAL
APPROX COMP AUGITE,FRESH*
Groundmass - PLAGIOCLASE+CLINOPYROXENE ( <5%)
Size(mm): <.02 Morphology: SKELETAL MICROLITES
NORMAL ZONING;
OPAQUE MINERALS ( <1%)
Size(mm): <.01 Morphology: VERY SMALL EQUANT EUHEDRAL
INCLUDES MAGN+ILMENITE,DISSEMINATED BETWEEN
SPHERULITES,MOST OF GROUNDMASS IS A SPHERULITIC
INTERGROWTH OF CPX+PLAG,OUTER BORDER=GLASS,ANGULAR
FRACTURES,ALTERATION HAS A CONCENTRIC PATTERN,
SMECTITE ALTERATION*
VEINS-NUMEROUS ANASTOMOSING,ACTUALLY CROSS-CUTS
XTLS AND FRAGMENTS THEM,CONSIST OF CHLORITE IN THE
CENTERS,+LAUMONTITE+QUARTZ(?) AT THE BORDERS;
Alteration - CARBONATE
Location: VEIN
IN CENTER OF CHLORITE VEIN;
CHLORITE ( 10%)
Location: VEINS Replacing: OL
PYRITE ( <1%)
Location: DISSEMINATED
Location: THROUGHOUT
Location: ROCK
.2MM*
Leg : 83 Top/Bottom Interval(mm): 30/ 50 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 928.50 Rock Type: IGNEOUS
Core: 82 Sample Midpoint(m) : 931.54 Sect/Pc #: 3/PCE 1
ROCK = OL-PLAG-CPX MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,FINE-GRAINED,VARIOLITIC;
Where sampled: GLASSY MARGIN*
Phenocrysts- OLIVINE ( 3%)
Size(mm): .6-1.3 Morphology: EUHEDRAL
COMPLETELY ALTERED;
PLAGIOCLASE ( 3%)
Size(mm): .1-1 Morphology: EUHEDRAL
COMPLETELY ALTERED;
CLINOPYROXENE ( <.5%)
Size(mm): .2-1 Morphology: SUBHEDRAL
APPROX COMP AUGITE,FRESH*
Groundmass - PLAGIOCLASE ( 1%)
Size(mm): .03-.5 Morphology: MICROLITES
CLINOPYROXENE+PLAGIOCLASE ( 93%)
KEMPTON,P.D. FINDS MORE PLAG FORMING GROUNDMASS
BECAUSE MORE NUCLEI AT TIME OF EXTRUSION-EMMERMAN,
R. DOES NOT SEE THIS IN REFLECTED LIGHT,PLAG+CPX
COMPOSE THE VARIOLES;
TITANOMAGNETITE ( 0%)
NOT VISIBLE;
PYRITE
DISSEMINATED*
VEIN OF CALCITE CROSSING BIG VEIN OF QUARTZ+LIGHT
GREEN MATERIAL(PHYLLITE)+SOME UNKNOWN MINERAL,
LAUMONTITE NEAR A VEIN(AT THE CONTACT BETWEEN VEIN
AND ROCK);
Alteration - CLAY MINERALS
Replacing: OL
LIGHT YELLOW TO LIGHT GREEN-PROBABLY NOT CHLORITE;
OTHER
Replacing: PLAG
COLORLESS MATERIAL*
Vesicles -
Percent: 0
Leg : 83 Top/Bottom Interval(mm): 1140/ 0 Describer: Emmermann, R.
Hole: 504B Top of Core Depth(m) : 937.50 Rock Type: IGNEOUS
Core: 83 Sample Midpoint(m) : 938.64 Sect/Pc #: 1/PCE 7
ROCK = OL-PLAG SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,SUBOPHITIC-INTERGRANULAR,FINE-
GRAINED;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( <2%)
Size(mm): <2 Morphology: SUBHEDRAL
COMPLETELY REPLACED BY CHLORITE;
PLAGIOCLASE ( <1%)
Size(mm): <1.5 Morphology: SUBHEDRAL
PARTIALLY ALTERED,REPLACED BY LOW BIREFRINGENT
MATERIAL*
Groundmass - PLAGIOCLASE ( 60%)
Size(mm): <1 Morphology: LATHY
PARTIALLY ALTERED,VEINS,PATCHES;
CLINOPYROXENE ( 30%)
Size(mm): <1 Morphology: EUHEDRAL-SUBHEDRAL
OPAQUE MINERALS
Size(mm): <.5 Morphology: EUHEDRAL
INCLUDES MAGN+ILMENITE,HAS TO BE DETERMINED IN
REFLECTED LIGHT,QUESTIONABLE SPHENE IS PRESENT,NO
EVIDENCE FOR PRESENCE OF FE.TI.OXIDES,NO MAGN
LEFT;
SULFIDES ( <2%)
Size(mm): <.5 Morphology: ANHEDRAL
INCLUDES PYRITE,DISSEMINATED THROUGHOUT ROCK*
Alteration - CARBONATE ( <1%)
Location: VEINLETS
CARBONATE FILLED VEINLETS;
FE-TI OXIDE
SEEM TO BE REPLACED BY SPHENE;
CHLORITE ( 1%)
Replacing: OL PHENOS
Leg : 83 Top/Bottom Interval(mm): 740/ 760 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 946.50 Rock Type: IGNEOUS
Core: 84 Sample Midpoint(m) : 947.25 Sect/Pc #: 1/PCE 4C
ROCK = CPX-PLAG-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,IMMATURE SHEAF,FINE-GRAINED
WITH GLOMEROCRYSTS*
Phenocrysts- OLIVINE ( 1%)
Size(mm): .3-.6 Morphology: EUHEDRAL
COMPLETELY REPLACED BY CHLORITE;
PLAGIOCLASE ( 3%)
Size(mm): .2-.8 Morphology: LATHS
PARTLY RESORBED,ZONED;
CLINOPYROXENE ( 5%)
Size(mm): .4-2.5 Morphology: SUBHEDRAL
PLAG+CPX IN GLOMEROPHYRIC AREA ABOUT .8 SQUARE CM
IN SURFACE*
Alteration - CHLORITE ( 1%)
Replacing: OL
SPHENE ( 1%)
Location: DISSEMINATED Replacing: OL
ID UNCERTAIN FOR SPHENE,ASSOCIATED WITH CHLORITE,
AS SMALL GRAINS,AS A REPLACEMENT OF OL,AND CHIEFLY
DISSEMINATED IN WHOLE ROCK;
SULFIDES ( 1%)
Location: DISSEMINATED
Location: THROUGHOUT
Location: ROCK
Vesicles -
Percent: 0
Leg : 83 Top/Bottom Interval(mm): 1050/ 0 Describer: Emmermann, R.
Hole: 504B Top of Core Depth(m) : 946.50 Rock Type: IGNEOUS
Core: 84 Sample Midpoint(m) : 949.05 Sect/Pc #: 2/PCE 15
ROCK = PLAG-OL-CPX MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,VARIOLITIC-IMMATURE SHEAF,
VERY FINE-GRAINED GROUNDMASS,QUENCH TEXTURES;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 1-2%)
Size(mm): <1.5 Morphology: EUHEDRAL
COMPLETELY ALTERED-REPLACED BY CHLORITE;
PLAGIOCLASE ( 2%)
Size(mm): <1.5 Morphology: SUBHEDRAL
PARTIALLY ALTERED-RESORPTION PHENOMENA?;
CLINOPYROXENE ( <1%)
Size(mm): <1 Morphology: ANHEDRAL-SUBHEDRAL
FORMING CLUSTERS WITH PLAG PHENOS*
Groundmass - PLAGIOCLASE ( 60%)
Size(mm): <<1 Morphology: LATH SHAPED
QUENCH TEXTURES,SKELETAL GROWTH;
CLINOPYROXENE ( 30%)
Size(mm): <<1 Morphology: PLUMOSE+SHEAF
INTERGROWN WITH OPAQUES;
OPAQUE MINERALS
Morphology: QUENCH
INCLUDES MAGN+ILMENITE,QUESTIONABLE FE.TI.OXIDES-
HAS TO BE CONFIRMED BY INVESTIGATION IN REFLECTED
LIGHT-SPHENE SEEMS TO BE PRESENT INSTEAD,MAGN ONLY
PRESENT IN SMALL AMOUNTS;
SULFIDES ( <1%)
Size(mm): <.5
DISSEMINATED THROUGHOUT ROCK*
Alteration - SULFIDES ( <1%)
Location: DISSEMINATED
CHLORITE ( 1-2%)
Replacing: OL PHENOS
Leg : 83 Top/Bottom Interval(mm): 1130/1170 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 955.50 Rock Type: IGNEOUS
Core: 85 Sample Midpoint(m) : 958.15 Sect/Pc #: 2/PCE 4D
ROCK = PLAG-OL-CPX MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,SUBOPHITIC,MEDIUM-GRAINED*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 1.5-2 Morphology: SUBHEDRAL
ALTERED;
PLAGIOCLASE ( 1%)
Size(mm): 2-3 Morphology: SUBHEDRAL
PARTLY ALTERED;
CLINOPYROXENE ( 1%)
Size(mm): 1-1.5 Morphology: SUBHEDRAL
FRESH*
Groundmass - OLIVINE ( 3%)
Size(mm): .5-1 Morphology: ANHEDRAL
COMPLETELY ALTERED;
PLAGIOCLASE ( 42%)
Size(mm): .2-1 Morphology: LATHS
PARTLY ALTERED;
CLINOPYROXENE ( 42%)
Size(mm): .4X.4 Morphology: ANHEDRAL
SLIGHTLY ALTERED AT EDGES;
OPAQUE MINERALS
INCLUDES MAGN+ILMENITE,RELICTS?*
Alteration - CLAY MINERALS
Replacing: OL
INCLUDES CHLORITE;
SPHENE
Location: INTERSTITIAL,
Location: OLD OL PHENOS
IN OLD OL PHENOS REPLACED BY CHLORITE(SMALL
GRAINS);
SULFIDES
Location: DISSEMINATED
Location: IN WHOLE ROCK
Vesicles -
Percent: 0
Leg : 83 Top/Bottom Interval(mm): 80/ 100 Describer: Emmermann, R.
Hole: 504B Top of Core Depth(m) : 964.50 Rock Type: IGNEOUS
Core: 86 Sample Midpoint(m) : 964.59 Sect/Pc #: 1/PCE 1
ROCK = PLAG-OL-CPX SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,SUBVARIOLITIC,VERY FINE-GRAINED,
QUENCH TEXTURE;
Where sampled: PILLOW INTERIOR
WS UNCERTAIN*
Phenocrysts- OLIVINE ( <1%)
Size(mm): <1 Morphology: EUHEDRAL-SUBHEDRAL
COMPLETELY ALTERED;
PLAGIOCLASE ( 1-2%)
Size(mm): <1.5 Morphology: SUBHEDRAL
PARTLY ALTERED;
CLINOPYROXENE ( <1%)
Size(mm): <1 Morphology: SUBHEDRAL-ANHEDRAL
Groundmass - PLAGIOCLASE ( <1%)
Morphology: LATH SHAPED-SKELETAL
CLINOPYROXENE ( <1%)
Morphology: ANHEDRAL
PLAG+CPX IN VARIOLITIC INTERGROWTH;
OPAQUE MINERALS ( 0%)
INCLUDES MAGN+ILMENITE,NOT DETECTED-CERTAINLY SEEM
TO BE REPLACED BY SPHENE;
SULFIDES ( <<1%)
Morphology: ANHEDRAL
MINOR SULFIDE DISSEMINATION,ONE RELATIVELY HIGH
BIREFRINGENT GRAIN*
Alteration - SPHENE ( <<1%)
Location: THROUGHOUT
OCCURS IN FINE-GRAINS THROUGHOUT ROCK;
ZEOLITE
MAY BE PRESENT-FEW WHITE UNIDENTIFIED MINERALS IN
VEIN;
CHLORITE ( <1%)
Replacing: OL PHENOS
ID UNCERTAIN FOR CHLORITE*
Leg : 83 Top/Bottom Interval(mm): 1030/ 0 Describer: Alt, J.C.
Hole: 504B Top of Core Depth(m) : 967.00 Rock Type: IGNEOUS
Core: 87 Sample Midpoint(m) : 968.03 Sect/Pc #: 1/PCE 7
ROCK = CPX-PLAG SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,INTERSERTAL-SUBOPHITIC;
Where sampled: MASSIVE COOLING UNIT
WS UNCERTAIN*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): .4-1.3 Morphology: TABULAR
PARTLY REPLACED WITH ALBITE;
CLINOPYROXENE ( 1%)
Size(mm): .8X1.5 Morphology: ROUNDED EQUANT-TABULAR
Groundmass - PLAGIOCLASE
Size(mm): .05X.5 Morphology: TABULAR
PARTLY ALTERED TO ALBITE;
CLINOPYROXENE
Size(mm): .05-.3 Morphology: EQUANT
PARTLY ALTERED TO CLAYS?+POSSIBLY MINOR
ACTINOLITE?;
MAGNETITE
Size(mm): .01-.1 Morphology: EQUANT-SKELETAL
PYRITE
SMALL GRAINS*
CHLORITE+SPHENE+SULFIDE VEIN-CPX MORE ALTERED
WITHIN 1MM OF VEIN,GRADES INTO CHLORITE+EPIDOTE+
LAUMONTITE VEIN*
Vesicles -
Filling: CHLORITE
MIAROLYTIC VOIDS*
Leg : 83 Top/Bottom Interval(mm): 130/ 150 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 967.00 Rock Type: IGNEOUS
Core: 87 Sample Midpoint(m) : 968.64 Sect/Pc #: 2/PCE 1B
ROCK = APHYRIC BASALT;
Texture: APHYRIC,SUBOPHITIC,MEDIUM-GRAINED*
Groundmass - OLIVINE ( 2%)
Size(mm): .5-1 Morphology: SUBHEDRAL
COMPLETELY REPLACED BY CHLORITE;
PLAGIOCLASE ( 48%)
Size(mm): .05-1.2 Morphology: LATHS
PARTLY REPLACED BY PROBABLY ALBITE;
CLINOPYROXENE ( 48%)
Size(mm): .8-1.6 Morphology: SUBHEDRAL
PARTLY REPLACED BY ACTINOLITE ON RIMS,ACTINOLITE
NEEDLES ARE LOCALLY FLEXUOUS;
OPAQUE MINERALS ( 0%)
INCLUDES MAGN+ILMENITE,COMPLETELY REPLACED*
VEIN FILLED WITH EPIDOTE,ANOTHER FILLED WITH 1)
CHLORITE 2)LAUMONTITE+EPIDOTE;
Alteration - SULFIDES
Location: DISSEMINATED
Location: IN WHOLE ROCK
Location: + ONE BIG
Location: VEIN CRYSTAL
INCLUDES PYRITE+SPHALERITE;
CHLORITE
Location: VEINS+OL Replacing: OL
Location: PHENOS
SPHENE ( <2%)
Location: INTERSTITIAL
ACTINOLITE
Replacing: PYX
PARTLY REPLACES PYX*
Leg : 83 Top/Bottom Interval(mm): 1030/1060 Describer: Emmermann, R.
Hole: 504B Top of Core Depth(m) : 976.50 Rock Type: IGNEOUS
Core: 88 Sample Midpoint(m) : 977.55 Sect/Pc #: 1/PCE 4E
ROCK = CPX-PLAG SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,SUBOPHITIC-INTERGRANULAR,FINE-
MEDIUM GRAINED;
Where sampled: FLOW INTERIOR-DIKE-MASSIVE UNIT
WS UNCERTAIN*
Phenocrysts- PLAGIOCLASE ( <<1%)
Size(mm): <1.5 Morphology: SUHBEDRAL
PARTLY ALTERED BY CHLORITE;
CLINOPYROXENE ( <1%)
Size(mm): <1.5 Morphology: ANHEDRAL
SOMETIMES REPLACED BY CHLORITE*
Groundmass - OLIVINE ( <2%)
Size(mm): <1 Morphology: EUHEDRAL
COMPLETELY REPLACED BY CHLORITE;
PLAGIOCLASE ( 60%)
Size(mm): <1 Morphology: LATH SHAPED-SUBHEDRAL
PARTLY ALTERED-SOME CHLORITE;
CLINOPYROXENE ( 30%)
Size(mm): <1 Morphology: ANHEDRAL
OPAQUE MINERALS ( 5%)
INCLUDES MAGN+ILMENITE,COMPLETELY REPLACED BY
SPHENE;
SPHENE
Morphology: ANHEDRAL
ID UNCERTAIN FOR SPHENE,SOME LARGER GRAINS IN OR
ADJACENT TO CHLORITE VEINS*
CHLORITE FILLED VEINLETS+VEINS FILLED WITH
CHLORITE+QUARTZ+LAUMONTITE;
Alteration - SPHENE
Replacing: FE.TI.OXIDES
CHLORITE
Replacing: OL
Leg : 83 Top/Bottom Interval(mm): 580/ 610 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 985.50 Rock Type: IGNEOUS
Core: 89 Sample Midpoint(m) : 987.60 Sect/Pc #: 2/PCE 8
ROCK = APHYRIC BASALT;
Texture: APHYRIC BASALT,FINE-MEDIUM GRAINED,INTERGRANULAR
-INTERSERTAL*
Groundmass - OLIVINE ( 5%)
Size(mm): .05X.08 Morphology: EUHEDRAL-SUBHEDRAL
REPLACED BY CHLORITE;
PLAGIOCLASE ( 44%)
Size(mm): .03X.8 Morphology: LATHS
PARTLY REPLACED;
CLINOPYROXENE ( 43%)
Size(mm): .3-.4
LOCALLY REPLACED BY ACTINOLITE(AND CHLORITE?);
OPAQUE MINERALS ( 0%)
INCLUDES MAGN+ILMENITE,COMPLETELY REPLACED*
VEINS FILLED BY CHLORITE+EPIDOTE+LAUMONTITE;
Alteration - ACTINOLITE
Replacing: RIMS OF CPX
CHLORITE
Location: VEINS, Replacing: OL
Location: INTERSTITIAL
Location: VOIDS
IN VEINS AS SOME TINY(<.01MM)XTLS AGGLOMERATED IN
PREFERENTIAL AREAS, VERY ABUNDANT;
SPHENE ( 8%)
Location: INTERSTITIAL
VERY COMMON AS INTERSTITIAL GRAINS*
Leg : 83 Top/Bottom Interval(mm): 1320/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 994.50 Rock Type: IGNEOUS
Core: 90 Sample Midpoint(m) : 995.82 Sect/Pc #: 1/PCE 19
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC
EXTENSIVELY VEINED-PROBABLY VARIOLITIC ORIGINALLY;
Where sampled: GLASSY MARGIN-NEXT TO GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): .4-2 Morphology: SUBHEDRAL
BADLY ALTERED*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): .01-.05 Morphology: SUBHEDRAL
PROBABLY ORIGINALLY VARIOLES WITH MICROLITE
CENTERS;
CLINOPYROXENE ( 5%)
Size(mm): .05 Morphology: FIBROUS
ACTINOLITE ( 3-4%)
Size(mm): <.004 Morphology: RADIATE-ACICULAR
PYRITE ( <1%)
CHLORITE ( 70%)
ALTERATION MATERIAL IN HOST;
EPIDOTE ( 1%)
Alteration - PYRITE ( 1-2%)
Location: VEINS
QUARTZ ( 45%)
Location: VEINS
LAUMONTITE ( 40%)
Location: VEINS
EPIDOTE ( 10%)
Location: VEINS
VEINS SHOW VERY DIFFUSE BOUNDARIES WITH WHAT WAS
ORIGIN HOST MATERIAL*
Leg : 83 Top/Bottom Interval(mm): 1380/ 0 Describer: Alt, J.C.
Hole: 504B Top of Core Depth(m) : 994.50 Rock Type: IGNEOUS
Core: 90 Sample Midpoint(m) : 998.88 Sect/Pc #: 3/PCE 14
ROCK = PLAG-CPX-SPINEL MODERATELY PHYRIC BASALTIC
BRECCIA;
Texture: MODERATELY PHYRIC,FINE-GRAINED,INTERGRANULAR-
Piece #: OSE;
Where sampled: BRECCIA*
Phenocrysts- PLAGIOCLASE ( 4%)
Size(mm): .1-1.2 Morphology: EQUANT-TABULAR EUHEDRAL
PARTLY ALTERED TO ALBITE;
CLINOPYROXENE ( <<1%)
Size(mm): .1 Morphology: ANHEDRAL
FRAGMENTS IN BRECCIA MATRIX;
SPINEL ( <<1%)
Size(mm): .1 Morphology: ANHEDRAL
FRAGMENTS IN BRECCIA MATRIX*
Groundmass - OLIVINE ( 20%)
REPLACED BY CHLORITE?;
PLAGIOCLASE ( 40%)
PARTLY REPLACED BY CHLORITE*
CLINOPYROXENE ( 40%)
PARTLY REPLACED BY CHLORITE;
MAGNETITE
REPLACED BY SPHENE;
OTHER
VOIDS?-FILLED WITH CHLORITE*
Alteration - SULFIDES
Location: DISSEMINATED
OTHER
QUARTZ VEINS (SEVERAL GENERATIONS) WITH MINOR
EPIDOTE+LAUMONTITE;
OTHER
BRECCIA MATRIX-ROCK+MINERAL FRAGMENTS CEMENTED BY
MOSTLY CHLORITE*
Leg : 83 Top/Bottom Interval(mm): 660/ 680 Describer: Emmermann, R.
Hole: 504B Top of Core Depth(m) : 994.50 Rock Type: IGNEOUS
Core: 90 Sample Midpoint(m) : 999.67 Sect/Pc #: 4/PCE 6B
ROCK = APHYRIC BASALT;
Texture: APHYRIC,SUBOPHITIC,BRECCIATED OR FRACTURED
TECTONICALLY DEFORMED,ROCK IS HIGHLY VEINED;
Where sampled: PILLOW INTERIOR-FLOW INTERIOR
WS UNCERTAIN*
PERCENTAGES DIFFICULT TO ESTIMATE;
Groundmass - OLIVINE
COMPLETELY REPLACED BY CHLORITE?;
PLAGIOCLASE
PARTLY ALTERED;
CLINOPYROXENE
PARTLY REPLACED BY ACTINOLITE?;
OPAQUE MINERALS
Morphology: EUHEDRAL
INCLUDES MAGN+ILMENITE,SOMETIMES EUHEDRAL,SEEM TO
BE COMPLETELY REPLACED BY SPHENE,FEW RELICTS OF
MAGN;
QUARTZ
Morphology: ANHEDRAL
MAIN VEIN FILLING MINERAL;
OTHER
CHROMIUM-SPINEL,FEW GRAINS;
OTHER
APPROX COMP CHLORITE,UBIQUITOUS;
OTHER
APPROX COMP SULFIDE,DISSEMINATED THROUGHOUT ROCK-
PYRITE*
ONE LARGER VEIN CROSSES THIN SECTION-QUARTZ+
CHLORITE+SULFIDES,SOME SMALLER VEINS PRESENT;
Alteration - CARBONATE ( 0%)
CHLORITE
Replacing: OL
ID UNCERTAIN FOR OL;
ZEOLITE
MINERAL REPLACED QUESTIONABLE;
ACTINOLITE
Replacing: CPX
ID UNCERTAIN FOR ACTINOLITE-LIGHT GREEN,RELATIVELY
HIGH BIREFRINGENCE,INCLINED(10 DEGREES)EXTINCTION,
PARTLY REPLACES CPX*
Leg : 83 Top/Bottom Interval(mm): 610/ 630 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1003.50 Rock Type: IGNEOUS
Core: 91 Sample Midpoint(m) : 1005.62 Sect/Pc #: 2/PCE 6D
ROCK = APHYRIC BASALTIC BRECCIA;
Texture: APHYRIC,FINE-GRAINED,IMMATURE SHEAF
IMMATURE SHEAF TEXTURE IN THE ELEMENTS OF THE
BRECCIA*
Groundmass - OLIVINE
PERCENTAGE UNKNOWN;
PLAGIOCLASE ( 50%)
Size(mm): .01-.15 Morphology: MICROLITES
PERCENTAGE UNCERTAIN,PROBABLY AT LEAST PARTLY
ALTERED BUT THIN SECTION HAS A POOR POLISH;
CLINOPYROXENE ( 40%)
Size(mm): .05X.05 Morphology: ANHEDRAL
PERCENTAGE UNKNOWN,PROBABLY AT LEAST PARTLY
ALTERED BUT THIN SECTION HAS A POOR POLISH;
OPAQUE MINERALS
INCLUDES MAGN+ILMENITE,PERCENTAGE UNKNOWN;
OTHER ( 10%)
INTERSTITIAL AREAS,PERCENTAGE UNCERTAIN,BAD POLISH
-SECTION TOO THIN TO DETERMINE MORPHOLOGY OR
APPROX COMP*
CEMENT VEIN FILLED WITH QUARTZ(UNIAXIAL(+),
HEXAGONAL SECTIONS)+SULFIDES+A FEW EPIDOTE+
CHLORITE(AT VEIN WALLS), PINKISH MATERIAL SEEN IN
HAND SPECIMEN NOT FOUND HERE;
Alteration - SPHENE
QUARTZ
EPIDOTE
CHLORITE
SULFIDES
ALL ALTERATION MINERALS LOCATED IN CEMENT OF
BRECCIA*
Leg : 83 Top/Bottom Interval(mm): 330/ 350 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1003.50 Rock Type: IGNEOUS
Core: 91 Sample Midpoint(m) : 1008.34 Sect/Pc #: 4/PCE 4
ROCK = APHYRIC BASALT;
Texture: APHYRIC,MEDIUM-GRAINED,INTERGRANULAR-SUBOPHITIC*
Groundmass - OLIVINE ( 3%)
Size(mm): .2X.2 Morphology: SUBHEDRAL
REPLACED BY CHLORITE,PERCENTAGE UNCERTAIN;
PLAGIOCLASE ( 45%)
Size(mm): .04-.8 Morphology: LATHS
PARTLY ALTERED;
CLINOPYROXENE ( 45%)
Size(mm): .4-2.5 Morphology: ANHEDRAL
APPROX COMP AUGITE,SOME XTLS PARTLY REPLACED BY
CHLORITE + OR -ACTINOLITE;
OPAQUE MINERALS
INCLUDES MAGN+ILMENITE,PERCENTAGES UNKNOWN,MIGHT
BE SOME RELICTIC MAGN;
OTHER
APPROX COMP PYRITE,DISSEMINATED*
VEINS FILLED WITH CHLORITE+QUARTZ+LAUMONTITE+A FEW
EPIDOTE WITHOUT OBVIOUS ORDER OF XTLLIZATION;
Alteration - CARBONATE ( TR%)
Location: INTERSTICES
CHLORITE
Location: VEINS, Replacing: OL,CPX
Location: INTERSTITIAL
Location: AREAS
SPHENE ( 7%)
Location: INTERSTITIAL
Location: AREAS
COMMON IN INTERSTITIAL AREAS*
Leg : 83 Top/Bottom Interval(mm): 430/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1012.50 Rock Type: IGNEOUS
Core: 92 Sample Midpoint(m) : 1014.43 Sect/Pc #: 2/PCE 5B
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,DENSE,VERY FINE-GRAINED
IMMATURE PLUMOSE TO VERY FINE-GRAINED INTERGRANULAR;
Where sampled: DIKE MARGIN-INTRUSIVE MATERIAL*
Phenocrysts- OLIVINE ( <1%)
Size(mm): .4-1.2 Morphology: EUHEDRAL
TOTALLY REPLACED BY CHLORITE+ACTINOLITE;
PLAGIOCLASE ( 4%)
Size(mm): .2-1.6 Morphology: EUHEDRAL
TOTALLY REPLACED BY LAUMONTITE+BROWNISH,
BIREFRINGENT DUSTY MATERIAL,OCCURS IN SMALL(.4-
.6MM) GLOMEROPHYRIC CLUSTERS;
CLINOPYROXENE ( 3%)
Size(mm): .3-1.6 Morphology: ANHEDRAL
APPROX COMP AUGITE,RESORBED,COMMONLY TWINNED(AS
IN OTHER SECTIONS)*
Groundmass - PLAGIOCLASE ( 1-2%)
Morphology: SKELETAL MICROLTIES
OPAQUE MINERALS ( 0%)
INCLUDES MAGN+ILMENITE,MOST OF GROUNDMASS IS A
DENSE INTERGROWTH OF QUENCH XTLLIZATION,SECTION IS
VERY INTENSELY VEINED+BRECCIATED,VEINS HAVE AN
ANASTOMOSING CHARACTER,THERE IS ALSO A SMALL
NUMBER OF XTLS AGGREGATED TOGETHER THAT LOOK LIKE
THEY HAVE BEEN BROKEN UP BY BRECCIATION*
VEINS CONTAIN LAUMONTITE+CHLORITE+EPIDOTE;
Alteration - EPIDOTE
Location: VEINS
IN VEINS WITH CHLORITE+LAUMONTITE;
CHLORITE
Location: VEINS
IN VEINS ALONE OR WITH LAUMONTITE;
LAUMONTITE
Location: VEINS Replacing: PLAG
IN VEINS ALONE,WITH CHLORITE OR REPLACING PLAG*
Leg : 83 Top/Bottom Interval(mm): 431/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1012.50 Rock Type: IGNEOUS
Core: 92 Sample Midpoint(m) : 1014.43 Sect/Pc #: 2/PCE 5B
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,INTERGRANULAR-INTERSERTAL;
Where sampled: DIKE MARGIN-HOST MATERIAL*
Phenocrysts- OLIVINE ( <<1%)
Size(mm): .2-.3 Morphology: EUHEDRAL
PLAGIOCLASE ( 2-3%)
Size(mm): .2-2 Morphology: SUBHEDRAL
CLINOPYROXENE ( <1%)
Size(mm): .4-1.5 Morphology: ANHEDRAL
APPROX COMP AUGITE,ROUNDED EDGES OR VERY ANGULAR
FRAGMENTS*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): <.05X.2 Morphology: SKELETAL LATHS
PARTIALLY ALTERED;
CLINOPYROXENE ( 30%)
Size(mm): <.05
APPROX COMP AUGITE;
OPAQUE MINERALS ( <1%)
Morphology: SMALL EQUANT EUHEDRAL
INCLUDES MAGN+ILMENITE,PARTIALLY ALTERED;
GLASS (10-15%)
INTERSTITIAL,INTENSELY VEINED + SOMEWHAT
BRECCIATED,VEINS CROSS-CUT PHENOS*
VEINS CONTAIN CHLORITE+QUARTZ+EPIDOTE+LAUMONTITE,
GENERALLY QUARTZ+EPIDOTE VEINS ARE CROSS-CUT BY
CHLORITE+LAUMONTITE VEINS;
Alteration - CHLORITE
Location: VEINS Replacing: PLAG
IN VEINS+ALERATION OL+PARTIAL REPLACEMENT OF PLAG;
QUARTZ
Location: VEINS
Leg : 83 Top/Bottom Interval(mm): 1210/1240 Describer: Emmermann, R.
Hole: 504B Top of Core Depth(m) : 1012.50 Rock Type: IGNEOUS
Core: 92 Sample Midpoint(m) : 1015.23 Sect/Pc #: 2/PCE 10B
ROCK = PLAG-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,INTERGRANULAR-SUBOPHITIC
Where sampled: PILLOW INTERIOR-FLOW INTERIOR
WS UNCERTAIN*
Phenocrysts- OLIVINE ( <2%)
Size(mm): <1.5 Morphology: EUHEDRAL-SUBHEDRAL
COMPLETELY REPLACED BY CHLORITE;
PLAGIOCLASE ( <2%)
Size(mm): <2 Morphology: SUBHEDRAL
PARTLY REPLACED BY WHITE MINERAL(ALBITE?)*
Groundmass - PLAGIOCLASE ( 60%)
Size(mm): <1 Morphology: LATHS
CLINOPYROXENE ( 30%)
Size(mm): <1 Morphology: ANHEDRAL
MOSTLY ANHEDRAL;
OPAQUE MINERALS ( 5%)
Morphology: EUHEDRAL
INCLUDES MAGN+ILMENITE,SEEM TO BE COMPLETELY
REPLACED BY SPHENE;
OTHER
VERY SMALL NEEDLE-LIKE XTLS,LENGTH SLOW;
OTHER ( TR%)
CHROMIUM-SPINEL?,ALTERING TO SPHENE?*
SOME VEINLETS-EPIDOTE+QUARTZ+CHLORITE+UNIDENTIFIED
WHITE MINERAL(ZEOLITE?);
Alteration - CARBONATE ( 0%)
CLAY MINERALS ( 0%)
SPHENE ( 5%)
Replacing: FE.TI.OXIDES
CHLORITE ( <2%)
Replacing: OL PHENOS
Leg : 83 Top/Bottom Interval(mm): 390/ 410 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1012.50 Rock Type: IGNEOUS
Core: 92 Sample Midpoint(m) : 1015.90 Sect/Pc #: 3/PCE 4
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,SUBOPHITIC,MEDIUM-GRAINED*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 2-4 Morphology: SUBHEDRAL
PARTIALLY REPLACED*
Groundmass - OLIVINE ( 5%)
HARD TO DISTINGUISH BECAUSE THIN SECTION IS TOO
THIN,REPLACED BY CHLORITE;
PLAGIOCLASE ( 50%)
Size(mm): .05X.6 Morphology: LATHS
PLAGIOCLASE
Size(mm): .4X2 Morphology: MICROPHENOS,SUBHEDRAL
TWO TYPES OF PLAG-PERCENTAGE IS FOR BOTH COMBINED,
BOTH ONLY PARTLY REPLACED;
CLINOPYROXENE ( 45%)
Morphology: ANHEDRAL-SUBHEDRAL
SOME XTLS BENT;
OPAQUE MINERALS ( 1%)
INCLUDES MAGN+ILMENITE,PERCENTAGE UNCERTAIN BUT
SOME IS PRESENT*
Alteration - CHLORITE
Replacing: OL
SULFIDES
Location: DISSEMINATED
Location: PYRITE
Vesicles -
Percent: 0
Leg : 83 Top/Bottom Interval(mm): 640/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1021.50 Rock Type: IGNEOUS
Core: 93 Sample Midpoint(m) : 1022.14 Sect/Pc #: 1/PCE 9
ROCK = OL-PLAG-CPX SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,DENSE,VERY FINE-GRAINED,IMMATURE
Piece #: OSE,SHEAF INTERGROWTH;
Where sampled: DIKE CHILLED MARGIN*
Phenocrysts- OLIVINE ( <<1%)
Size(mm): .8 Morphology: SUBHEDRAL
TOTALLY REPLACED BY CHLORITE;
PLAGIOCLASE
Size(mm): .1-1.2 Morphology: SUBHEDRAL-EUHEDRAL
TOTALLY REPLACED BY CHLORITE,OCCURS AS A FEW SMALL
GLOMEROCRYSTS AS WELL AS PHENOS,2-3 TIMES AS WIDE
AS IS LONG;
CLINOPYROXENE
Size(mm): .4-2 Morphology: SUBHEDRAL-ANHEDRAL
APPROX COMP AUGITE,ALTERED RIMS,TWINNED,ALTERATION
MAY BE ACTINOLITE WITH CHLORITE RIMS,SOME CPX
PHENOS HAVE INCLUSIONS OF SMALL PLAG LATHS(.08-
.16) BUT NOT ALL-THESE MAY BE XENOCRYSTS SINCE
THEY ARE ANHEDRAL AND OTHERS ARE EUHEDRAL*
Groundmass - PLAGIOCLASE
CLINOPYROXENE
GROUNDMASS IS A DENSE VERY FINE-GRAINED
INTERGROWTH OF CPX+PLAG,I.E.,VERY IMMATURE PLUMOSE
+SHEAF INTERGROWTH, MINOR PREFERRED ORIENTATION
OF PHENOS PARALLEL TO QUENCH MARGIN*
INTENSELY VEINED AT QUENCH BORDER,VEIN MATERIAL
INCLUDES INTERSPERSED VEINS OF QUARTZ+CHLORITE+
MINOR EPIDOTE,VEINS ALSO CROSSCUT AND DISRUPT
PHENOS;
Alteration - EPIDOTE
Location: VEINS
CHLORITE
Location: VEINS Replacing: OL,MINOR PLAG
ACTINOLITE
Location: VEINS Replacing: CPX
REPLACES CPX XTLS TRAPPED IN VEINS;
QUARTZ
Location: VEINS
HAS BIMODAL GRAIN SIZE-LOOKS TO BE STRAINED+
DEFORMED*
Leg : 83 Top/Bottom Interval(mm): 350/ 380 Describer: Emmermann, R.
Hole: 504B Top of Core Depth(m) : 1021.50 Rock Type: IGNEOUS
Core: 93 Sample Midpoint(m) : 1023.37 Sect/Pc #: 2/PCE 3
ROCK = PLAG-OL-CPX MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,FINE-GRAINED,INTERGRANULAR;
Phenocrysts- OLIVINE ( <1%)
Size(mm): <1.5 Morphology: EUHEDRAL-SUBHEDRAL
COMPLETELY REPLACED BY CHLORITE;
PLAGIOCLASE ( 2%)
Size(mm): <2 Morphology: SUBHEDRAL
GLOMEROCRYSTS,PARTLY ALTERED TO CHLORITE IN PLAG+
CARBONATE GRAINS;
CLINOPYROXENE ( <1%)
Size(mm): <1.5 Morphology: SUBHEDRAL-ANHEDRAL
Groundmass - PLAGIOCLASE ( 60%)
Size(mm): <1 Morphology: LATHS
CLINOPYROXENE ( 30%)
Size(mm): <1 Morphology: ANHEDRAL
OPAQUE MINERALS ( 5%)
Morphology: EUHEDRAL
INCLUDES MAGN+ILMENITE,SOME EUHEDRAL,SEEMS TO BE
COMPLETELY REPLACED BY SPHENE,RELICTIC MAGN
PRESENT?
OTHER ( <1%)
INCLUDES SULFIDES+PYRITE,DISSEMINATED THROUGHOUT
ROCK*
VEINS-MAINLY FILLED WITH QUARTZ+LAUMONTITE+
CHLORITE;
Alteration - CARBONATE
FEW GRAINS-SOMETIMES IN PLAG;
SPHENE ( 5%)
Replacing: FE.TI.OXIDES
EPIDOTE ( TR%)
Location: VEINS
WITH CHLORITE+QUARTZ;
CHLORITE ( <1%)
Replacing: OL PHENOS
Leg : 83 Top/Bottom Interval(mm): 410/ 430 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1030.50 Rock Type: IGNEOUS
Core: 94 Sample Midpoint(m) : 1030.92 Sect/Pc #: 1/PCE 5
ROCK = APHYRIC BASALT;
Texture: APHYRIC,MEDIUM-COARSE GRAINED,OPHITIC-
SUBOPHITIC*
Groundmass - OLIVINE ( 5%)
Size(mm): 1.2-2 Morphology: EUHEDRAL
COMPLETELY REPLACED BY A SCALY MINERAL WHICH IS
NOT CHLORITE;
PLAGIOCLASE ( 40%)
Size(mm): .05X2 Morphology: LATHS
SIZE IS AVERAGE SIZE,ALMOST COMPLETELY FRESH;
CLINOPYROXENE ( 40%)
Size(mm): 1.5-2.5 Morphology: ANHEDRAL
SOME XTLS BENT,APPARENTLY NOT REPLACED BY
ACTINOLITE(SEEMS TO BE PRESENT IN RELICTS)*
Alteration - PHYLLITE
Replacing: OL
HIGH BIREFRINGENCE,STRAIGHT EXTINCTION;
CHLORITE
Location: IN RARE
Location: INTERSTITIAL
Location: VOIDS
SULFIDES ( 5%)
Location: DISSEMINATED Replacing: PYRITE
Location: THROUGH ROCK
SPHENE ( 0%)
Leg : 83 Top/Bottom Interval(mm): 710/ 0 Describer: Alt, J.C.
Hole: 504B Top of Core Depth(m) : 1030.50 Rock Type: IGNEOUS
Core: 94 Sample Midpoint(m) : 1032.71 Sect/Pc #: 2/PCE 5
ROCK = OL-PLAG-CPX MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,INTERSERTAL-SUBOPHITIC;
Where sampled: UNIFORM MASSIVE COOLING UNIT
WS UNCERTAIN*
Phenocrysts- OLIVINE ( 2%)
Morphology: EUHEDRAL
REPLACED BY BROWNISH CLAY MINERAL+SULFIDES;
PLAGIOCLASE ( 1%)
Morphology: EQUANT-TABULAR
PARTLY ALTERED TO ALBITE;
CLINOPYROXENE ( 1%)
Morphology: ROUNDED-ANHEDRAL
Groundmass - OLIVINE ( 20%)
Morphology: SKELETAL
ALTERED TO GREEN CLAY MINERAL;
PLAGIOCLASE ( 40%)
Morphology: PRISMATIC-TABULAR
PARTLY ALTERED TO CLAY?;
CLINOPYROXENE ( 40%)
Morphology: EQUANT
PARTLY ALTERED TO CLAY?;
MAGNETITE
Morphology: BLOCKY-ANGULAR
APPEARS TOTALLY ALTERED TO FINE-GRAINED BROWN
MATERIAL;
OTHER
Morphology: EQUANT-EUHEDRAL
APPROX COMP FES2,COMMON DISSEMINATED SULFIDES*
Alteration - CARBONATE ( 0%)
CLAY MINERALS ( 10%)
Replacing: OL,CPX,PLAG
INCLUDES CHLORITE+SMECTITE?;
ZEOLITE ( 0%)
Vesicles -
Percent: 10
Filling: GREEN CLAY
Shape: IRREGULAR-
Shape: ANGULAR
GREEN CLAY OF LOW BIREFRINGENCE-CHLORITE?,
MIAROLYTIC VOIDS*
Leg : 83 Top/Bottom Interval(mm): 900/ 940 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1030.50 Rock Type: IGNEOUS
Core: 94 Sample Midpoint(m) : 1034.42 Sect/Pc #: 3/PCE 10
ROCK = OL-CPX-PLAG MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,MEDIUM-GRAINED,SUBOPHITIC*
Phenocrysts- OLIVINE ( 2%)
Size(mm): .6-1.5 Morphology: EUHEDRAL
REPLACED BY CHLORITE;
PLAGIOCLASE
MICROPHENOS;
CLINOPYROXENE ( 1%)
Size(mm): SUBHEDRAL
Groundmass - OLIVINE ( 5%)
Size(mm): .05-.1 Morphology: ANHEDRAL
REPLACED BY CHLORITE;
PLAGIOCLASE ( 50%)
Size(mm): .3-.7 Morphology: SUBHEDRAL
MICROPHENOS FORMING GLOMEROPHYRIC AREAS;
PLAGIOCLASE
Size(mm): .01-.5 Morphology: LATHS
ONLY PARTLY REPLACED BY UNKNOWN MATERIAL,THERE ARE
TWO TYPES PLAG-THEIR TOTAL PERCENTAGE BEING 50%;
CLINOPYROXENE ( 40%)
Size(mm): .3-.5 Morphology: SUBHEDRAL-ANHEDRAL
FRESH;
OPAQUE MINERALS ( 0%)
INCLUDES MAGN+ILMENITE*
Alteration - CHLORITE
Replacing: OL
SPHENE
Location: INTERSTITIAL
.05MM GRAINS;
SULFIDES ( 2%)
Location: DISSEMINATED
Location: IN WHOLE ROCK
Leg : 83 Top/Bottom Interval(mm): 340/ 360 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1039.50 Rock Type: IGNEOUS
Core: 95 Sample Midpoint(m) : 1039.85 Sect/Pc #: 1/PCE 2C
ROCK = CPX-PLAG-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,MEDIUM-GRAINED,INTERGRANULAR-
INTERSERTAL*
Phenocrysts- OLIVINE ( <1%)
Size(mm): .7-1.5 Morphology: SUBHEDRAL
COMPLETELY REPLACED BY CHLORITE;
PLAGIOCLASE ( 2%)
Size(mm): .4-2 Morphology: SUBHEDRAL
ONLY PARTLY REPLACED;
CLINOPYROXENE ( 5%)
Size(mm): .6-2 Morphology: SUBHEDRAL
SOME PARTLY REPLACED BY ACTINOLITE ON THEIR RIMS*
Groundmass - OLIVINE
HARD TO DISTINGUISH FROM INTERSTITIAL AREAS
BECAUSE REPLACED BY CHLORITE;
PLAGIOCLASE ( 40%)
Size(mm): .02-.5 Morphology: LATHS
PARTLY REPLACED;
CLINOPYROXENE ( 40%)
Size(mm): .05-.07 Morphology: ANHEDRAL
MOST AT LEAST PARTLY REPLACED BY ACTINOLITE AND
OFTEN COMPLETELY REPLACED;
OPAQUE MINERALS
INCLUDES MAGN+ILMENITE,PERCENTAGE UNKNOWN;
OTHER ( 10%)
INTERSTITIAL AREAS+OL MICROCRYSTS*
VEIN FILLED WITH EPIDOTE RADIATED XTLS+LAUMONTITE+
VERY TINY NEEDLE-LIKE XTLS(IMPOSSIBLE TO
DETERMINE-ACTINOLITE?)WHICH ARE HERE SUPERIMPOSED
TO LAUMONTITE,CHLORITE(IN MINOR AMOUNTS) OCCURS
CHIEFLY AT VEIN WALLS,EPIDOTE SEEMS ANTERIOR TO
LAUMONTITE, THREE CALCITE XTLS IN LAUMONTITE AREA;
Alteration - EPIDOTE
Location: VEIN
CALCITE
Location: VEIN
MINOR AMOUNT;
LAUMONTITE
Location: VEIN Replacing: OL
CHLORITE
Location: VEIN Replacing: OL
SPHENE ( 4%)
Location: INTERSTITIAL
Location: AREAS
ACTINOLITE
Replacing: CPX
PHENOS+MICROCRYSTS*
Leg : 83 Top/Bottom Interval(mm): 1270/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1048.50 Rock Type: IGNEOUS
Core: 96 Sample Midpoint(m) : 1049.77 Sect/Pc #: 1/PCE 7
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,MEDIUM-GRAINED,SUBOPHITIC*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 1.2-1.6 Morphology: EUHEDRAL
REPLACED;
PLAGIOCLASE ( 2%)
Size(mm): .8-2 Morphology: SUBHEDRAL
NORMAL ZONING,FRACTURED AND REPLACED BY CHLORITE,
PATCHY REPLACEMENT BY ALBITE;
CLINOPYROXENE ( 1%)
Size(mm): 1-1.5 Morphology: ANHEDRAL
APPROX COMP AUGITE;
Groundmass - OLIVINE ( 5%)
Size(mm): .2-.5
REPLACED BY CHLORITE;
PLAGIOCLASE ( 40%)
Size(mm): .1-.5 Morphology: LATHS,SLIGHTLY SKELETAL
MAY BE RIMS ON PLAG WHICH REPRESENT LATE STAGE
DIFFERENTIATE MATERIAL;
CLINOPYROXENE ( 35%)
Size(mm): .1-.2 Morphology: ANHEDRAL
APPROX COMP AUGITE;
OPAQUE MINERALS ( 5%)
Size(mm): .1
INCLUDES MAGN+ILMENITE,ALTERED TO SPHENE?
(DIFFICULT TO TELL)-TI-MAGN PARTLY ALTERED*
Alteration - CHLORITE ( 5%)
Location: INTERSTICES Replacing: OL
SULFIDES ( 1-2%)
Location: DISSEMINATED
Location: THROUGHOUT
Location: GROUNDMASS
ACTINOLITE ( 5%)
Location: ALTERING AT Replacing: CPX
Location: CPX RIMS
INTERSTICES FILLED WITH CHLORITE+ACTINOLITE?
MIXTURE*
Leg : 83 Top/Bottom Interval(mm): 260/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1057.50 Rock Type: IGNEOUS
Core: 97 Sample Midpoint(m) : 1059.26 Sect/Pc #: 2/PCE 3A
ROCK = APHYRIC BASALT;
Texture: APHYRIC,MEDIUM-GRAINED,SUBOPHITIC-INTERGRANULAR*
Groundmass - OLIVINE ( 7%)
Size(mm): .4-.8 Morphology: EUHEDRAL
TOTALLY REPLACED BY SMECTITE;
PLAGIOCLASE ( 50%)
Size(mm): .2-1.3 Morphology: SUBHEDRAL
APPROX COMP AN30,NORMALLY ZONED;
CLINOPYROXENE ( 40%)
Size(mm): .2-.5 Morphology: ANHEDRAL
APPROX AUGITE;
TITANOMAGNETITE ( 3%)
Morphology: EUHEDRAL-SLIGHTLY SKELETAL
PARTIALLY ALTERED BUT GENERALLY FRESH OR SOME
FRESH RELICTS(ACCORDING TO OBSERVATION IN
REFLECTED LIGHT),THERE ARE A FEW PATCHES WHERE THE
CPX-PLAG INTERGROWTHS ARE FINER-GRAINED THAN THE
BULK SAMPLE-HAS "STARBURST" APPEARANCE*
Alteration - CLAY MINERALS ( 7%)
Location: INTERSTICES Replacing: OL
CONTAINS DISSEMINATED OPAQUES;
PYRITE ( 1%)
Location: DISSEMINATED
Location: THROUGH ROCK
Leg : 83 Top/Bottom Interval(mm): 190/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1062.00 Rock Type: IGNEOUS
Core: 98 Sample Midpoint(m) : 1062.19 Sect/Pc #: 1/PCE 3
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,IMMATURE SHEAF;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( <<1%)
Size(mm): .4-.8 Morphology: ANHEDRAL
RAGGED EDGES,DIFFUSE CORE RIM BREAK,RIM HAS QUENCH
XTLLIZATION IN FINAL STAGES*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): .01-.5 Morphology: SKELETAL
QUENCH TEXTURE,NORMAL ZONING;
CLINOPYROXENE ( 60%)
Size(mm): <.04 Morphology: PLUMOSE
QUENCH TEXTURE,APPROX COMP AUGITE;
OPAQUE MINERALS ( 3%)
INCLUDES MAGN+ILMENITE,POSSIBLY UNALTERED*
ALTERATION APPEARS TO BE EXTREMELY MINIMAL;
Alteration - PYRITE ( <1%)
Location: DISSEMINATED
Location: THROUGHOUT
Location: ROCK
Leg : 83 Top/Bottom Interval(mm): 750/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1062.00 Rock Type: IGNEOUS
Core: 98 Sample Midpoint(m) : 1062.75 Sect/Pc #: 1/PCE 11
ROCK = APHYRIC BASALT;
Texture: APHYRIC,SUBOPHITIC;
Where sampled: DIKE
WS UNCERTAIN*
Groundmass - OLIVINE ( 10%)
TOTALLY ALTERED TO CHLORITE;
PLAGIOCLASE ( 35%)
NORMAL ZONING,PARTIAL PATCHY REPLACEMENT,FELDSPAR
ALTERATION IS POSSIBLY ALBITE+LAUMONTITE(LOW
BIREFRINGENCE,LOW RELIEF,PALE BEIGE COLOR,RADIATE
HABIT)*
Alteration - ACTINOLITE
Location: INTERSTICES
ID UNCERTAIN FOR ACTINOLITE;
CLAY MINERALS ( 6-8%)
Location: INTERSTICES Replacing: OL
INCLUDES CHLORITE;
PYRITE ( 2%)
Location: DISSEMINATED
Location: THROUGHOUT
Location: ROCK
Leg : 83 Top/Bottom Interval(mm): 170/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1071.50 Rock Type: IGNEOUS
Core: 99 Sample Midpoint(m) : 1073.17 Sect/Pc #: 2/PCE 2
ROCK = PLAG-CPX-OL SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,VERY FINE-GRAINED
EQUIGRANULAR QUENCH TEXTURE BUT NOT VARIOLES;
Where sampled: DIKE CONTACT-INTRUSIVE MATERIAL(DIKE)*
MICROPHENOS;
Phenocrysts- CHLORITE
OCCURS IN VEINS ASSOCIATED WITH EPIDOTE,ALSO FORMS
OLIVINE ( <<1%)
Size(mm): .1-.3 Morphology: EUHEDRAL
TOTALLY REPLACED BY CHLORITE;
EXTENSIVE ALTERATION IN A ZONE APPROX 1.2MM WIDE
AT CONTACT BETWEEN DIKE AND HOST*
PLAGIOCLASE ( 1%)
Size(mm): .04-.4 Morphology: EUHEDRAL
PLAG PHENOS PREFERENTIALLY ALIGNED PARALLEL TO
QUENCH CONTACT*
Groundmass - OLIVINE
PLAGIOCLASE
CLINOPYROXENE
GROUNDMASS CONSISTS OF A COMPLEX INTERGROWTH OF
FINE QUENCH CRYSTALS-MOST LIKELY OF PLAG+CPX,
QUENCH AGGREGATES ARE PROBABLY NO LARGER THAN
ABOUT .05MM,TEXTURE IS SIMILAR TO SUBVARIOLITIC
BUT IN A FINER SCALE AND CPX+PLAG APPEAR TO BE
INTERGROWN*
Leg : 83 Top/Bottom Interval(mm): 171/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1071.50 Rock Type: IGNEOUS
Core: 99 Sample Midpoint(m) : 1073.17 Sect/Pc #: 2/PCE 2
ROCK = APHYRIC BASALT;
Texture: APHYRIC,INTERGRANULAR-INTERSERTAL,FINE-GRAINED;
Where sampled: DIKE CONTACT-HOST MATERIAL*
Groundmass - OLIVINE ( 0%)
NO OL APPARENT DUE TO ALTERATION AND GRAIN SIZE;
PLAGIOCLASE ( 40%)
Size(mm): .05-.2 Morphology: SUBHEDRAL
NORMAL ZONED,ALTERED;
CLINOPYROXENE ( 50%)
Size(mm): .05-.2 Morphology: ANHEDRAL
APPROX COMP AUGITE,PARTIALLY ALTERED TO A BROWNISH
MATERIAL;
OPAQUE MINERALS ( 1%)
INCLUDES MAGN+ILMENITE,PERCENTAGE UNCERTAIN,BADLY
ALTERED VERY SMALL OPAQUES*
Alteration - CHLORITE ( 6-7%)
Replacing: PLAG
MAINLY IN VEINS ASSOCIATED WITH EPIDOTE + OR -
LAUMONTITE,OCCURS INTERSTITIALLY AS WELL,PLAG
REPLACEMENT UNCERTAIN*
Leg : 83 Top/Bottom Interval(mm): 640/ 660 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1071.50 Rock Type: IGNEOUS
Core: 99 Sample Midpoint(m) : 1073.65 Sect/Pc #: 2/PCE 7
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,FINE-GRAINED,INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( <<1%)
Size(mm): .03X.06 Morphology: SUBHEDRAL LATHS
PARTLY ALTERED*
Groundmass - OLIVINE ( 5%)
Size(mm): .01-.04
COMPLETELY REPLACED BY CHLORITE;
PLAGIOCLASE ( 50%)
Size(mm): .01-.4 Morphology: MICROLITES
PARTLY ALTERED INTO CHLORITE+SOME UNKNOWN MINERAL;
CLINOPYROXENE ( 35%)
Size(mm): .03-.1 Morphology: ANHEDRAL
PARTLY REPLACED BY ACTINOLITE;
OPAQUE MINERALS ( 10%)
INCLUDES MAGN+ILMENITE,SOME FRESH RELICTS TI-MAGN-
BUT MOST XTLS AT LEAST PARTLY ALTERED*
VEIN-2 TYPES AND GENERATIONS OF CHLORITE-ONE WITH
ABNORMAL BLUE INTERFERENCE COLOR+ONE WITHOUT THIS
COLOR BUT WITH LAUMONTITE,ACTINOLITE OCCURS AT
VEIN BORDERS WITH THE CHLORITE+QUARTZ(UNIAXIAL(+))
HAVING NORMAL INTERFERENCE COLORS;
Alteration - CHLORITE
Location: VEINS Replacing: OL,PLAG
QUARTZ
UNIAXIAL(+);
SULFIDES ( <<1%)
Location: DISSEMINATED
Leg : 83 Top/Bottom Interval(mm): 1390/1440 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1080.50 Rock Type: IGNEOUS
Core: 100 Sample Midpoint(m) : 1081.92 Sect/Pc #: 1/PCE 16
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PHYRIC,MEDIUM-GRAINED,INTERGRANULAR*
Phenocrysts- OLIVINE ( <1%)
Size(mm): .5-1.5 Morphology: SUBHEDRAL
REPLACED BY PROBABLY CHLORITE;
PLAGIOCLASE ( 5%)
Size(mm): .3-3 Morphology: SUBHEDRAL
PARTLY ALTERED,STILL ZONED;
CLINOPYROXENE ( 4%)
Size(mm): .4-4.8 Morphology: SUBHEDRAL-EUHEDRAL
APPARENTLY FRESH*
Groundmass - OLIVINE ( 5%)
Size(mm): .05-.1
COMPLETELY REPLACED BY CHLORITE;
PLAGIOCLASE ( 37%)
Size(mm): .02-.2 Morphology: MICROLITES
PARTLY ALTERED;
CLINOPYROXENE ( 11%)
Size(mm): .1 Morphology: ANHEDRAL
SEEM TO BE FRESH;
OPAQUE MINERALS ( 8%)
INCLUDES MAGN+ILMENITE*
SOME AREAS(VEINS?) WITH LAUMONTITE?;
Alteration - CHLORITE
Replacing: OL
ID UNCERTAIN FOR CHLORITE*
Leg : 83 Top/Bottom Interval(mm): 910/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1080.50 Rock Type: IGNEOUS
Core: 100 Sample Midpoint(m) : 1082.91 Sect/Pc #: 2/
ROCK = PLAG-OL SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,DENSE,VERY FINE-GRAINED,IMMATURE
Piece #: OSE;
Where sampled: DIKE CHILLED MARGIN-INTRUSIVE MATERIAL*
Phenocrysts- OLIVINE ( <<1%)
Size(mm): .8 Morphology: EUHEDRAL
TOTALLY REPLACED BY CHLORITE;
PLAGIOCLASE ( <1%)
Size(mm): .04-.4 Morphology: SUBHEDRAL
NORMAL ZONING,PARTIALLY REPLACED*
Groundmass - PLAGIOCLASE ( 2-3%)
Size(mm): <.01 Morphology: SKELETAL MICROLITES
OPAQUE MINERALS ( 1%)
Size(mm): <.005
INCLUDES MAGN+ILMENITE,OCCURS INTERSTITIAL TO
PLUMOSE XTLS,MOST OF GROUNDMASS IS A DENSE
INTERGROWTH OF PLAG+CPX QUENCH XTLLIZATION,TEXTURE
ACTUALLY VARIES FROM A NEAR GLASSY BORDER 3.5MM
WIDE WHERE THE TEXTURE IS ALMOST VARIOLITIC INTO
THE DENSE PLUMOSE STRUCTURE*
Alteration - CHLORITE ( <<1%)
Replacing: OL
Leg : 83 Top/Bottom Interval(mm): 911/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1080.50 Rock Type: IGNEOUS
Core: 100 Sample Midpoint(m) : 1082.91 Sect/Pc #: 2/
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,FINE-GRAINED,INTERGRANULAR-
SUBOPHITIC;
Where sampled: DIKE MARGIN-HOST MATERIAL*
Phenocrysts- OLIVINE ( <1%)
Size(mm): -1.2 Morphology: SUBHEDRAL
TOTALLY REPLACED BY CHLORITE;
PLAGIOCLASE ( 2%)
Size(mm): .35-1.7 Morphology: SUBHEDRAL
PARTIALLY REPLACED BY ALBITE?,OCCURS IN
GLOMEROCRYSTS;
CLINOPYROXENE ( 1%)
Size(mm): .2-.8 Morphology: ANHEDRAL
APPROX COMP AUGITE,RELATIVELY FRESH BUT HAVE LATE
STAGE NUCLEATION+XTLLIZATION ON RIMS,GLOMEROCRYSTS
OCCUR UP TO 2MM IN DIAMETER*
Groundmass - OLIVINE
HARD TO ASSESS DUE TO INTERSTITIAL ALTERATION;
PLAGIOCLASE ( 35%)
Size(mm): .03-.3 Morphology: SUBHEDRAL LATHS
NORMAL ZONING,PARTIALLY ALTERED;
CLINOPYROXENE ( 35%)
Size(mm): .05-.2 Morphology: ANHEDRAL
APPROX COMP AUGITE,COMMONLY SUBOPHITIC INTERGROWN
WITH PLAG;
OPAQUE MINERALS ( 1%)
Size(mm): .01-.035 Morphology: EQUANT
INCLUDES MAGN+ILMENITE,MAY BE PARTIALLY ALTERED*
VEIN OF CHLORITE OCCURS AT BOUNDARY BETWEEN THE
HOST AND INTRUDING MATERIAL;
Alteration - CHLORITE ( 25%)
Location: VEIN, Replacing: OL
Location: INTERSTITIAL
QUARTZ ( 1%)
Location: VEIN
Leg : 83 Top/Bottom Interval(mm): 1010/1040 Describer: Emmermann, R.
Hole: 504B Top of Core Depth(m) : 1080.50 Rock Type: IGNEOUS
Core: 100 Sample Midpoint(m) : 1083.03 Sect/Pc #: 2/PCE 13
ROCK = PLAG-OL-CPX MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,GROUNDMASS INTERGRANULAR TO
SUBOPHITIC,FINE-GRAINED;
Where sampled: FLOW INTERIOR-MASSIVE UNIT(DIKE)
WS UNCERTAIN*
Phenocrysts- OLIVINE ( <1%)
Size(mm): <1 Morphology: EUHEDRAL
COMPLETELY REPLACED BY CHLORITE;
PLAGIOCLASE ( 2%)
Size(mm): <1.5 Morphology: SUBHEDRAL
SOMETIMES OCCURRING AS GLOMEROCRYSTS,PARTLY
ALTERED(REPLACED BY ALBITE?);
CLINOPYROXENE ( <<1%)
Size(mm): <1 Morphology: ANHEDRAL
OCCASIONALLY GRADING INTO FIBROUS MINERAL
(ACTINOLITE?)*
Groundmass - OLIVINE ( 2-3%)
Size(mm): <.5 Morphology: EUHEDRAL
REPLACED BY CHLORITE?;
PLAGIOCLASE ( 60%)
Size(mm): <1 Morphology: LATH-SHAPED
PARTLY REPLACED BY ALBITE(?);
CLINOPYROXENE ( 30%)
Size(mm): <1 Morphology: ANHEDRAL
SOMETIMES GRADING INTO FIBROUS MINERAL;
OPAQUE MINERALS ( 5%)
Morphology: EUHEDRAL-SUBHEDRAL
INCLUDES MAGN+ILMENITE,MOSTLY ALTERED,SOME FRESH
RELICTS IN REFLECTED LIGHT;
OTHER ( <<1%)
Size(mm): <1 Morphology: ANHEDRAL
APPROX COMP PYRITE,DISSEMINATED THROUGHOUT ROCK;
CHLORITE ( 2%)
CHLORITE OR OTHER SHEET SILICATE,DISSEMINATED IN
ROCK*
Alteration - PYRITE ( TR%)
DISSEMINATED THROUGH ROCK;
ZEOLITE ( 4-5%)
Replacing: PLAG
INCLUDES ALBITE;
CHLORITE ( 3-4%)
Replacing: OL
Leg : 83 Top/Bottom Interval(mm): 770/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1089.50 Rock Type: IGNEOUS
Core: 101 Sample Midpoint(m) : 1090.27 Sect/Pc #: 1/PCE 7
ROCK = PLAG-OL-CPX MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,VERY FINE GRAINED,VERY
IMMATURE SHEAF;
Where sampled: CHILLED MARGIN-INTRUDING MATERIAL-DIKE*
Phenocrysts- OLIVINE ( 1%)
Size(mm): .1-.3 Morphology: EUHEDRAL
TOTALLY REPLACED;
PLAGIOCLASE ( 3%)
Size(mm): .2-.8
PARTIAL,PATCHY REPLACEMENT,NORMAL ZONING;
CLINOPYROXENE ( <1%)
Size(mm): .2-.8
APPROX COMP AUGITE*
Groundmass - PLAGIOCLASE
Size(mm): <.01 Morphology: QUENCH
PERCENTAGE DIFFICULT TO ASSESS;
CLINOPYROXENE
Size(mm): .05-.01 Morphology: PLUMES
APPROX COMP AUGITE;
OPAQUE MINERALS ( 1-2%)
Morphology: EUHEDRAL
INCLUDES MAGN+ILMENITE,VERY SMALL XTLS,PARTIALLY
REPLACED,BOUNDARY BETWEEN HOST AND DIKE IS VERY
SHARP AND DIKE TEXTURE VARIES FROM VERY FINE-
GRAINED TO AN IMMATURE SHEAF TEXTURE OVER A
DISTANCE OF 1CM,BORDER ZONE HAS A PREFERENTIAL
ALIGNMENT OF PLAG LATHS*
VEIN OF LAUMONTITE PRESENT;
Alteration - CHLORITE ( 1I%)
Location: NTERSTICES+
Location: EIN BORDER
LAUMONTITE ( V%)
Location: EIN MINERAL
Leg : 83 Top/Bottom Interval(mm): 771/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1089.50 Rock Type: IGNEOUS
Core: 101 Sample Midpoint(m) : 1090.27 Sect/Pc #: 1/PCE 7
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,FINE-GRAINED,INTERGRANULAR;
Where sampled: CHILLED MARGIN-HOST MATERIAL*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 4-6 Morphology: SKELETAL
COMPLETELY REPLACED BY CHLORITE;
PLAGIOCLASE ( 1-2%)
Size(mm): .05-.5
NORMAL ZONED,PATCHY PARTIAL REPLACEMENT BY LOW
BIREFRINGENT MINERAL(LAUMONTITE?),OCCURS IN SMALL
GLOMEROCRYSTS*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): .01-.05 Morphology: LATHS
LATHS ARE TINY,PARTIALLY REPLACED?;
CLINOPYROXENE ( 50%)
Size(mm): .01-.05 Morphology: ANHEDRAL-SUBHEDRAL
OPAQUE MINERALS ( 1%)
Size(mm): .005-.01 Morphology: EQUANT SUBHEDRAL
INCLUDES MAGN+ILMENITE*
Alteration - LAUMONTITE
Location: VEINS
VEINS CROSS CUT BOTH HOST AND DIKE LITHOLOGIES*
Leg : 83 Top/Bottom Interval(mm): 390/ 430 Describer: Emmermann, R.
Hole: 504B Top of Core Depth(m) : 1089.50 Rock Type: IGNEOUS
Core: 101 Sample Midpoint(m) : 1091.41 Sect/Pc #: 2/PCE 5
ROCK = PLAG-OL-CPX MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,INTERGRANULAR TO SUBOPHITIC,
FINE-MEDIUM GRAINED;
Where sampled: FLOW INTERIOR-MASSIVE UNIT(DIKE)
WS UNCERTAIN*
Phenocrysts- OLIVINE ( <1%)
Size(mm): <3 Morphology: EUHEDRAL
COMPLETELY REPLACED BY CHLORITE;
PLAGIOCLASE ( 2%)
Size(mm): <2 Morphology: SUBHEDRAL
SOMETIMES CLUSTERED WITH OL PHENOS,PARTLY REPLACED
BY ALBITE?;
CLINOPYROXENE ( <<1%)
Size(mm): <1.5
Groundmass - OLIVINE ( 1-2%)
Size(mm): <1 Morphology: EUHEDRAL
COMPLETELY REPLACED BY CHLORITE;
PLAGIOCLASE ( 60%)
Size(mm): <1.5 Morphology: ANHEDRAL-LATH SHAPED
PARTLY REPLACED BY ALBITE;
CLINOPYROXENE ( 30%)
Size(mm): <1 Morphology: ANHEDRAL
APPEARS TO BE RELATIVELY FRESH;
OPAQUE MINERALS ( 5%)
Size(mm): <1 Morphology: EUHEDRAL-SUBHEDRAL
INCLUDES MAGN+ILMENITE,PARTLY ALTERED-FRESH
RELICTS;
OTHER ( <1%)
Morphology: ANHEDRAL
APPROX COMP PYRITE,DISSEMINATED THROUGHOUT ROCK*
Alteration - ALBITE ( 1-4%)
Replacing: PLAG
CHLORITE ( 2-3%)
Replacing: OL
Leg : 83 Top/Bottom Interval(mm): 440/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1098.50 Rock Type: IGNEOUS
Core: 102 Sample Midpoint(m) : 1098.94 Sect/Pc #: 1/PCE 5A
ROCK = PLAG-OL SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,MEDIUM-GRAINED,INTERGRANULAR-
SUBOPHITIC;
Where sampled: REPRESENTATIVE+SMALL VEIN*
Phenocrysts- OLIVINE ( <1%)
Morphology: EUHEDRAL
TOTALLY REPLACED BY CHLORITE;
PLAGIOCLASE ( 1%)
Morphology: SUBHEDRAL LATHS
PARTIALLY ALTERED,NORMAL ZONING,OCCURS IN
GLOMEROCRYSTS,PLAG REPLACEMENT= CHLORITE+
LAUMONTITE?(LOW BIREFRINGENCE,LOW RELIEF,RADIATE
HABIT) SOME MAY BE ALBITE*
Groundmass - OLIVINE ( 2%)
PLAGIOCLASE ( 50%)
CLINOPYROXENE ( 40%)
Morphology: ANHEDRAL
FRESH TO SLIGHT CHLORITE REPLACEMENT;
OPAQUE MINERALS ( 1%)
Morphology: EQUANT+EUHEDRAL
INCLUDES MAGN+ILMENITE,PARTIALLY ALTERED AT RIMS*
Alteration - CHLORITE ( 5%)
Location: INTERSTIAL, Replacing: OL
Location: VEINS
Leg : 83 Top/Bottom Interval(mm): 90/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1107.50 Rock Type: IGNEOUS
Core: 103 Sample Midpoint(m) : 1107.59 Sect/Pc #: 1/PCE 2
ROCK = PLAG-CPX-OL-SPINEL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,DENSE,CRYPTOCRYSTALLINE;
Where sampled: DIKE MARGIN-INTRUSIVE MATERIAL*
Phenocrysts- OLIVINE ( <1%)
Size(mm): .3-.45 Morphology: EUHEDRAL
REPLACED BY CHLORITE;
PLAGIOCLASE ( 2%)
Size(mm): .3-2.5 Morphology: SUBHEDRAL
REPLACED BY ALBITE?/LAUMONTITE?,COMMONLY OCCURS IN
GLOMEROCRYSTS;
CLINOPYROXENE ( 1%)
Size(mm): .4-1.5 Morphology: SUBHEDRAL
APPROX COMP AUGITE,RELATIVELY FRESH,NUCLEATION AT
RIMS;
SPINEL ( TR%)
Size(mm): <.05 Morphology: EQUANT EUHEDRAL
APPROX COMP CHROMIUM-SPINEL,SOME OPHITICALLY
ENCLOSE PLAG*
GROUNDMASS A DENSER INTEGRATION OF PLAG+CPX
PLUMOSE QUENCH TEXTURES-DIFFICULT TO ESTIMATE
CHARACTER*
Alteration - CHLORITE
Location: VEINS Replacing: OL
LAUMONTITE
Location: SMALL VEINS Replacing: PLAG
ID UNCERTAIN FOR PLAG*
Leg : 83 Top/Bottom Interval(mm): 91/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1107.50 Rock Type: IGNEOUS
Core: 103 Sample Midpoint(m) : 1107.59 Sect/Pc #: 1/PCE 2
ROCK = PLAG-CPX SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,VERY FINE-GRAINED,IMMATURE
Piece #: OSE TO FINE-GRAINED SUBOPHITIC;
Where sampled: DIKE MARGIN-HOST MATERIAL*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): .3-1 Morphology: SUBHEDRAL
PARTIALLY ALTERED;
CLINOPYROXENE ( <<1%)
Size(mm): .4 Morphology: SUBHEDRAL
APPROX COMP AUGITE,TWINNED*
Groundmass - OLIVINE ( 1%)
Size(mm): <.1
TOTALLY REPLACED BY CHLORITE;
PLAGIOCLASE ( 40%)
Size(mm): <.15 Morphology: LATHS
CLINOPYROXENE ( 50%)
Size(mm): <.075
APPROX COMP AUGITE,REPLACED BY ACTINOLITE?;
OPAQUE MINERALS ( 1%)
Morphology: EQUANT
INCLUDES MAGN+ILMENITE,MODERATELY ALTERED*
VEINS OF CHLORITE,CHLORITE+ACTINOLITE AND
CHLORITE+LAUMONTITE+ACTINOLITE,VEINING MOST
INTENSE AT CONTACT BETWEEN DIKE AND HOST;
Alteration - ACTINOLITE
Replacing: CPX
CHLORITE ( 3-5%)
Location: VEINS Replacing: OL
LAUMONTITE ( 1%)
Location: VEINS
PYRITE ( 1-2%)
Location: DISSEMINATED
Location: THROUGH ROCK
OTHER
TRACE OF MINERAL WITH HIGH RELIEF,HIGH BIREFRING.*
Leg : 83 Top/Bottom Interval(mm): 830/ 0 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1116.50 Rock Type: IGNEOUS
Core: 104 Sample Midpoint(m) : 1118.83 Sect/Pc #: 2/PCE 4D
ROCK = APHYRIC BASALT;
Texture: APHYRIC,COARSE-GRAINED,SUBOPHITIC*
Groundmass - OLIVINE ( 12%)
Size(mm): .4-1.6 Morphology: SUBHEDRAL+ANHEDRAL
COMPLETELY REPLACED BY DARK GREEN AND LIGHTER
GREEN MATERIAL(CLAY?-CHLORITE?);
PLAGIOCLASE ( 35%)
Size(mm): .05X.8
2 SIZE RANGES-1X2 MM ALSO, ZONED,PARTLY REPLACED
BY ALBITE?;
CLINOPYROXENE ( 37%)
Size(mm): .8-2 Morphology: ANHEDRAL
FRESH;
OPAQUE MINERALS ( 8%)
Morphology: SOME SKELETAL,SOME NOT
INCLUDES MAGN+ILMENITE,IN INTERSTITIAL AREAS,
STRONGLY ALTERED INTO UNKNOWN MINERAL AND
SOMETIMES REPLACED BY PYRITE;
GLASS ( 8%)
SOME INTERSTITIAL AREAS,WHICH ARE MICROCRYSTALLINE
(PLAG+CPX+OPAQUES)-SOME ARE COMPLETELY REPLACED
BY CHLORITE AND COULD HAVE BEEN GLASS*
Alteration - CHLORITE
Replacing: GLASS,OL
ALBITE
Replacing: PLAG
ID UNCERTAIN FOR ALBITE;
SULFIDES ( <1%)
Location: DISSEMINATED
Leg : 83 Top/Bottom Interval(mm): 510/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1116.50 Rock Type: IGNEOUS
Core: 104 Sample Midpoint(m) : 1120.01 Sect/Pc #: 3/PCE 7
ROCK = APHYRIC BASALT;
Texture: APHYRIC,MEDIUM-GRAINED,SUBOPHITIC;
Where sampled: REPRESENTATIVE*
Groundmass - OLIVINE ( 7-8%)
Size(mm): .2-1 Morphology: SUBHEDRAL
TOTALLY REPLACED BY BRIGHT GREEN MINERAL;
PLAGIOCLASE ( 35%)
Size(mm): .2-1.5
PARTIALLY REPLACED BY ALBITE+CHLORITE,NORMAL
ZONING,LARGER XTLS HAVE SCATTERED BROWNISH PATCHES
OF ALTERATION THAT MAY REPRESENT ALTERATION OF
GLASS-DUE TO RESORPTION OF XTL;
CLINOPYROXENE ( 40%)
Size(mm): .2-1.5
APPROX COMP AUGITE,FRESH;
MAGNETITE ( 3%)
Size(mm): .2-1 Morphology: EQUANT EUHEDRAL
PARTIALLY ALTERED;
ILMENITE ( <1%)
Size(mm): <.01-.1 Morphology: SKELETAL ELONGATE
ID UNCERTAIN FOR MAGN+ILMENITE*
Alteration - OTHER ( 15%)
INTERSTITIAL CHLORITE+ALTERATION;
CHLORITE
Location: INTERSTICES Replacing: OL,PARTIAL PLAG
CHLORITE+BROWNISH ALTERATION IN INTERSTICES;
ALBITE
Replacing: CA-PLAG
Leg : 83 Top/Bottom Interval(mm): 460/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1125.50 Rock Type: IGNEOUS
Core: 105 Sample Midpoint(m) : 1125.96 Sect/Pc #: 1/PCE 7
ROCK = OL-PLAG-CPX MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,INTERGRANULAR;
Where sampled: REPRESENTATIVE SAMPLE+VEIN*
MICROPHENOS;
Phenocrysts- OLIVINE ( 1-2%)
Size(mm): .4-1.2 Morphology: EUHEDRAL
TOTALLY ALTERED TO CHLORITE;
PLAGIOCLASE ( 1%)
Size(mm): .3-1.2 Morphology: SUBHEDRAL
EXTENSIVELY ALTERED;
CLINOPYROXENE ( <<1%)
Size(mm): .8-.9 Morphology: SUBHEDRAL
APPROX COMP AUGITE,RELATIVELY FRESH,TWINNED,
RESORBED EDGES*
Groundmass - PLAGIOCLASE ( 30%)
Morphology: SUBHEDRAL
ALTERED TO LAUMONTITE AND/OR ALBITE PARTIALLY TO
TOTALLY,ELONGATE(L/W=8/1) AND FORMS RADIATE
PATTERNS WITH 2-3 OTHER LATHS;
CLINOPYROXENE ( 35%)
Size(mm): .05-.25 Morphology: ANHEDRAL
APPROX COMP AUGITE,EXTENSIVELY ALTERED TO
ACTINOLITE-ESPECIALLY NEAR VEIN;
OPAQUE MINERALS ( 2-3%)
Size(mm): .01-.05 Morphology: EQUANT
INCLUDES MAGN+ILMENITE,PARTIALLY ALTERED,
OTHER ( 7-8%)
ADDITIONAL INTERSTITIAL ALTERATION OTHER THAN
CHLORITE,BROWNISH,DUSTY APPEARANCE*
VEIN AT EDGE OF SAMPLE-EPIDOTE IN CENTER OF
CHLORITE VEIN,ONE PATCH OF CHLORITE HAS A SMALL,
BROWN SPHERULITIC XTLLIZATION-HAS RADIAL
EXTINCTION,ALSO ARE LARGE PATCHES OF LAUMONTITE?
WITH FIBERS OF ACTINOLITE GROWING INTO THEM,
PREHNITE OCCURS WITH THE SPHERULITIC XTLS;
Alteration - ACTINOLITE ( 8%)
CHLORITE ( 7-8%)
Location: INTERSTITIAL+ Replacing: OL
Location: SIGNIFICANT
Location: PORTION OF
Location: ROCK
LAUMONTITE ( 5%)
Location: PATCHES Replacing: PLAG
PREHNITE ( <1%)
Location: PATCHES
ASSOCIATED WITH BROWN SPHERULITIC XTLS*
Leg : 83 Top/Bottom Interval(mm): 330/ 350 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1134.50 Rock Type: IGNEOUS
Core: 106 Sample Midpoint(m) : 1134.84 Sect/Pc #: 1/PCE 4
ROCK = APHYRIC BASALT
Texture: APHYRIC,MEDIUM-GRAINED,OPHITIC-SUBOPHITIC
SUBOPHITIC DOMINATES OVER OPHITIC*
Groundmass - OLIVINE ( 6%)
Size(mm): .1-.5 Morphology: ANHEDRAL-SUBHEDRAL
COMPLETELY REPLACED BY CHLORITE;
PLAGIOCLASE ( 40%)
Size(mm): .04-2 Morphology: LATHS
PARTLY REPLACED BY CHLORITE+ALBITE?+LAUMONTITE?;
CLINOPYROXENE ( 46%)
Size(mm): .5-1.6 Morphology: ANHEDRAL
FRESH,BUT SOME XTLS ARE PARTLY REPLACED BY
ACTINOLITE IN AN AREA(CLOSE TO A VEIN WHICH HAS
DISAPPEARED DURING THIN SECTIONING);
TITANOMAGNETITE ( 4%)
Size(mm): .04 Morphology: SKELETAL
IN INTERSTITIAL AREAS,EXTENSIVELY ALTERED;
GLASS ( 4%)
POSSIBLE INTERSTITIAL GLASS,REPLACED BY CHLORITE,
SOMETIMES HARD TO DISTINGUISH FROM OL XTLS*
AN AREA(16 SQUARE MM) IS STRONGLY ALTERED AND
CORRESPONDS PERHAPS TO A VEIN OF CHLORITE AND
PROBABLY LAUMONTITE,AGAINST WHICH PYROXENE IS
PARTLY REPLACED BY ACTINOLITE AND PLAGIOCLASE BY
PROBABLY LAUMONTITE;
Alteration - SULFIDES ( <1%)
Location: DISSEMINATED
ALBITE
Replacing: PLAG
ID UNCERTAIN FOR ALBITE;
LAUMONTITE
Location: ALTERED AREAS Replacing: PLAG
ID UNCERTAIN FOR LAUMONTITE;
CHLORITE
Replacing: OL,PLAG,GLASS
ACTINOLITE
Replacing: PYX
REPLACES SOME PYX IN AN AREA*
Leg : 83 Top/Bottom Interval(mm): 110/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1143.50 Rock Type: IGNEOUS
Core: 107 Sample Midpoint(m) : 1143.61 Sect/Pc #: 1/PCE 2
ROCK = PLAG-OL-CPX SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,VERY FINE-GRAINED
BRECCIATED TO DENSE,VERY FINE-GRAINED GRANULAR
TO VERY FINE-GRAINED IMMATURE PLUMOSE TEXTURE*
MICROPHENOS IN CHILLED BORDER;
Phenocrysts- OLIVINE ( <1%)
Size(mm): .075-.1 Morphology: EUHEDRAL
TOTALLY ALTERED TO CHLORITE;
PLAGIOCLASE ( 1%)
Size(mm): .02-.1 Morphology: EUHEDRAL LATHS
CLINOPYROXENE ( <1%)
Size(mm): .02-.05 Morphology: SUBHEDRAL-ANHEDRAL
APPROX COMP AUGITE*
PERCENTAGES DIFFICULT TO ESTIMATE DUE TO XTL SIZE;
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): <.3
CLINOPYROXENE ( 58%)
Size(mm): <.05 Morphology: SKELETAL QUENCH PLUMOSE
MAGNETITE ( <1%)
Size(mm): <.008 Morphology: EQUANT
THERE IS A TRACE OF HIGH RELIEF,HIGH BIREFRINGENCE
UNIAXIAL(-) MINERAL IN ALTERATION OF BRECCIATED
ZONE-COULD BE A CARBONATE;
Alteration - ACTINOLITE
ONLY OCCURS SIGNIFICANTLY IN BRECCIATED ZONE;
OTHER
UNKNOWN MINERAL,RELIEF IS LOWER THAN EPOXY,LOW
BIREFRINGENCE(APPROX .01),RADIATE TYPE HABIT,
COLORLESS,PROBABLY NOT LAUMONTITE,2V=65,COULD BE
ALTERED PLAG OR ALBITE;
SULFIDES ( <1%)
Location: DISSEMINATED
Location: THROUGH ROCK
MORE ABUNDANT IN BRECCIATED ZONE*
Leg : 83 Top/Bottom Interval(mm): 570/ 600 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1152.50 Rock Type: IGNEOUS
Core: 108 Sample Midpoint(m) : 1153.09 Sect/Pc #: 1/PCE 7
ROCK = APHYRIC BASALT;
Texture: APHYRIC,FINE-GRAINED,SUBOPHITIC-INTERGRANULAR*
Groundmass - OLIVINE ( 3%)
Size(mm): .1-.2 Morphology: SUBHEDRAL
COMPLETELY REPLACED BY SMECTITE?(DARK BROWN-GREEN
WITH HIGH BIREFRINGENCE)+OPAQUES;
PLAGIOCLASE ( 46%)
Size(mm): .04-.8 Morphology: LATHS
ZONED,VERY PARTLY REPLACED BY CHLORITE;
CLINOPYROXENE ( 47%)
Size(mm): .2-.4 Morphology: SUBHEDRAL
FRESH;
TITANOMAGNETITE ( 4%)
PARTLY ALTERED(50%);
GLASS
SOME SMALL AREAS ARE FINER GRAINED*
Alteration - CLAY MINERALS
Replacing: OL
INCLUDES CHLORITE AND POSSIBLY SMECTITE(DARK BROWN
GREEN WITH HIGH BIREFRINGENCE);
SULFIDES
Location: <1DISSEMIN Replacing: ATED
Leg : 83 Top/Bottom Interval(mm): 840/ 860 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1157.00 Rock Type: IGNEOUS
Core: 110 Sample Midpoint(m) : 1157.85 Sect/Pc #: 1/
ROCK = PLAG-CPX-OL SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,MEDIUM-GRAINED,INTERGRANULAR,
LOCALLY VERY MATURE SHEAF*
Phenocrysts- OLIVINE ( <<1%)
Size(mm): .3-1 Morphology: SUBHEDRAL
COMPLETELY REPLACED(BY SMECTITE?,CHLORITE?);
PLAGIOCLASE ( 1%)
Size(mm): .4-1 Morphology: PLATY,SUBHEDRAL
PARTLY REPLACED;
CLINOPYROXENE ( <1%)
Size(mm): .3-1 Morphology: ANHEDRAL
FRESH*
Groundmass - OLIVINE ( 5%)
Size(mm): .02-.4 Morphology: ANHEDRAL
COMPLETELY REPLACED BY PROBABLY CHLORITE;
PLAGIOCLASE ( 40%)
Size(mm): .04-.6
PARTLY ALTERED INTO UNKNOWN MINERAL(BAD POLISH);
CLINOPYROXENE ( 50%)
Size(mm): .08-.2 Morphology: ANHEDRAL
APPARENTLY FRESH;
OPAQUE MINERALS
INCLUDES MAGN+ILMENITE,PERCENTAGE UNCERTAIN;
GLASS ( 5%)
ID+PERCENTAGE UNCERTAIN FOR GLASS,SOME COMPLETELY
REPLACED BY CHLORITE IN SOME INTERSTITIAL AREAS?
(UNLESS IT IS ANHEDRAL CRYSTALS OF OL?)*
Alteration - CHLORITE
Replacing: OL
ID UNCERTAIN FOR CHLORITE;
SMECTITE
Replacing: OL
ID UNCERTAIN FOR SMECTITE;
SULFIDES
Leg : 83 Top/Bottom Interval(mm): 840/ 860 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1161.50 Rock Type: IGNEOUS
Core: 111 Sample Midpoint(m) : 1162.35 Sect/Pc #: 1/PCE 9
ROCK = PLAG-OL-SPINEL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,VERY FINE-GRAINED,INTERSERTAL
FLUIDAL*
Phenocrysts- OLIVINE ( 3%)
Size(mm): .5-1 Morphology: EUHEDRAL
COMPLETELY REPLACED BY DARK GREENISH BROWN
MATERIAL(SAPONITE?)+SMALL OPAQUE ALTERED GRAINS
ALONG RIMS AND CRACKS;
PLAGIOCLASE ( 4%)
Size(mm): .3-2.4 Morphology: EUHEDRAL
ZONED,PARTLY ALTERED INTO CLAY MATERIAL? AND
LAUMONTITE?;
SPINEL ( <1%)
Size(mm): .03-.2 Morphology: EUHEDRAL MICROPHENOS
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): .02X.2 Morphology: SUBHEDRAL MICROLITES
PARTLY ALTERED,MICROLITES ARE ORIENTED AROUND
PHENOS;
CLINOPYROXENE ( 46%)
Size(mm): .02-.03 Morphology: ANHEDRAL
VERY STRONGLY ALTERED IN PROBABLE ACTINOLITE(BAD
POLISH);
TITANOMAGNETITE ( 6%)
Alteration - ACTINOLITE
Location: GROUNDMASS Replacing: CPX
CLAY MINERALS
Replacing: OL
UNKNOWN COMPOSITION;
SULFIDES
Location: DISSEMINATED,
Location: AROUND OL
Location: RIMS
Leg : 83 Top/Bottom Interval(mm): 1040/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1161.50 Rock Type: IGNEOUS
Core: 111 Sample Midpoint(m) : 1162.54 Sect/Pc #: 1/PCE 10B
ROCK = PLAG-OL-SPINEL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC
DENSE VERY FINE-GRAINED GRANULAR TO A VERY FINE-
GRAINED SUBOPHITIC(?) TEXTURE;
Where sampled: DIKE MARGIN-CHILLED DIKE MATERIAL*
Phenocrysts- OLIVINE ( 3%)
Size(mm): .2-1.5 Morphology: EUHEDRAL
TOTALLY ALTERED TO CHLORITE;
PLAGIOCLASE ( 4%)
Size(mm): .2-2.5
TOTALLY REPLACED BY LAUMONTITE,OCCURS IN
GLOMEROCRYSTS(3-20 XTLS),2.8 MM DIAMETER OR LESS;
SPINEL ( <<1%)
Size(mm): .08-.16 Morphology: EUHEDRAL
APPROX COMP CHROMIUM SPINEL,SOME SLIGHTLY RESORBED
AND OCCUR AT THE EDGES OF OL*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): <.06 Morphology: SUBHEDRAL LATHS
NORMAL ZONING;
CLINOPYROXENE ( 48%)
Size(mm): <.04 Morphology: ANHEDRAL SKELETAL
ID UNCERTAIN FOR SKELETAL,APPROX COMP AUGITE,
UNALTERED;
OPAQUE MINERALS ( <1%)
Size(mm): <.004 Morphology: EQUANT
ALTERED TO SPHENE,OCCUR BOTH WITHIN CPX AND
INTERSTITIAL TO IT,INCLUDES MAGN+ILMENITE*
Alteration - PYRITE ( <1%)
Replacing: OL
ASSOCIATED WITH CHLORITE REPLACING OL AND MINOR
AMOUNTS OCCUR IN GROUNDMASS AS ALTERATION
UNRELATED TO VEIN*
Leg : 83 Top/Bottom Interval(mm): 1041/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1161.50 Rock Type: IGNEOUS
Core: 111 Sample Midpoint(m) : 1162.54 Sect/Pc #: 1/PCE 10B
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,MEDIUM-GRAINED,INTERGRANULAR;
Where sampled: DIKE MARGIN,HOST MATERIAL
DIKE BOUNDARY VERY SHARP*
Phenocrysts- OLIVINE ( .05%)
Size(mm): .2-.4
MICROPHENOS,MORPHOLOGY UNDETERMINABLE DUE TO
ALTERATION,TOTALLY REPLACED BY CHLORITE;
PLAGIOCLASE ( 3%)
Size(mm): .2-1.25 Morphology: SUBHEDRAL
TOTALLY REPLACED BY LAUMONTITE?,PATCHY APPEARANCE;
CLINOPYROXENE ( 1%)
Size(mm): .8-1.75 Morphology: EUHEDRAL-ANHEDRAL
UNALTERED,HAS LATE STAGE NUCLEATION AT RIMS
COMMONLY,ALSO OPHITICALLY ENCLOSES FELDSPARS OF
EQUIVALENT SIZE AS IN GROUNDMASS,APPROX COMP
AUGITE*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .02-.25 Morphology: SUBHEDRAL LATHS
NORMAL ZONING,PARTIALLY REPLACED;
CLINOPYROXENE ( 42%)
Size(mm): .05-.2 Morphology: ANHEDRAL
APPROX COMP AUGITE,FIBROUS REPLACEMENT NEAR VEIN
OF LAUMONTITE,OTHER PLACES DUSTY BROWNISH
REPLACEMENT;
OPAQUE MINERALS ( 1%)
INCLUDES MAGN+ILMENITE,PARTIALLY REPLACED*
VEINS OF CHLORITE ALONG BORDER OF CHILLED MARGIN +
OF LAUMONTITE WITH CENTRAL PORTIONS OF PREHNITE +
UNKNOWN BROWN MINERAL;
Alteration - ACTINOLITE
Location: NEAR Replacing: CPX
Location: ALUMONTITE
Location: VEIN
ID UNCERTAIN FOR ACTINOLITE,FIBROUS REPLACEMENT OF
CPX;
CHLORITE ( 1-2%)
Location: VEINS, Replacing: OL
Location: INTERSTICES
LAUMONTITE ( 1%)
Location: VEIN PARALLEL
Location: TO CHILLED
Location: MARGIN
OTHER
UNKNOWN BROWN MINERAL,UPPER FIRST BIREFRINGENT,
SPHERICAL,RADIAL HABIT,ASSOCIATED WITH PREHNITE*
Leg : 83 Top/Bottom Interval(mm): 730/ 760 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1171.00 Rock Type: IGNEOUS
Core: 113 Sample Midpoint(m) : 1171.74 Sect/Pc #: 1/PCE 7
ROCK = PLAG-OL SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,SUBOPHITIC*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 1-2 Morphology: SUBHEDRAL
COMPLETELY REPLACED BY CHLORITE NEAR THE CHLORITE
VEIN AND BY PROBABLE CLAY AWAY FROM THEREIN;
PLAGIOCLASE ( 1%)
Size(mm): 1-2.4 Morphology: EUHEDRAL,PLATY
PARTLY ALTERED ALONG CRACKS BY CHLORITE?+SMEC?+
ALBITE*
Groundmass - OLIVINE ( 4%)
Size(mm): .2-.3
COMPLETELY REPLACED BY DARK BROWN MATERIAL(SMEC
PROBABLY) AND BY CHLORITE;
PLAGIOCLASE ( 42%)
Size(mm): .08X1 Morphology: SUBHEDRAL LATHS
PARTLY ALTERED BY ALBITE+CHLORITE?;
CLINOPYROXENE ( 42%)
Size(mm): .2-.6 Morphology: ANHEDRAL
FRESH,EXCEPT ALONG THE VEIN(WHERE CPX IS REPLACED
BY ACTINOLITE AND/OR CHLORITE) AND SOME
INTERSTITIAL AREAS REPLACED BY CHLORITE;
TITANOMAGNETITE ( 3%)
PERCENTAGE UNCERTAIN;
OTHER ( 5%)
INTERSTITIAL AREAS,REPLACED BY CHLORITE*
VEIN FILLED WITH CHLORITE+ACTINOLITE+THREE XTLS
OF POSSIBLE LAUMONTITE(N>1.50) IN THE CENTER;
Alteration - ACTINOLITE
Location: VEIN, Replacing: CPX
Location: INTERSTITIAL
Location: AREAS
CLAY MINERALS
Replacing: OL,INTERSTITIAL AREAS
INCLUDES CHLORITE;
LAUMONTITE
Location: VEIN
ID UNCERTAIN FOR LAUMONTITE;
SULFIDES ( 2%)
Location: DISSEMINATED
PERCENTAGE UNCERTAIN*
Leg : 83 Top/Bottom Interval(mm): 120/ 140 Describer: Emmermann, R.
Hole: 504B Top of Core Depth(m) : 1180.50 Rock Type: IGNEOUS
Core: 115 Sample Midpoint(m) : 1180.63 Sect/Pc #: 1/PCE 2
ROCK = CPX-PLAG-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,GROUNDMASS INTERSERTAL+FINE-
GRAINED;
Where sampled: DIKE*
Phenocrysts- OLIVINE ( 1%)
Size(mm): <1.5 Morphology: EUHEDRAL
COMPLETELY REPLACED BY CHLORITE;
PLAGIOCLASE ( 1.5%)
Size(mm): <2.0 Morphology: SUBHEDRAL
PARTLY REPLACED(PATCHY) BY ALBITE?;
CLINOPYROXENE ( 1.5%)
Size(mm): <2.5 Morphology: ANHEDRAL
APPARENTLY FRESH*
Groundmass - OLIVINE ( <1%)
Size(mm): <.5 Morphology: EUHEDRAL
COMPLETELY REPLACED;
PLAGIOCLASE ( 60%)
Size(mm): <1 Morphology: LATHS
PARTLY REPLACED BY ALBITE(SOMETIMES CHLORITE) AND
SOME OTHER WHITE MINERAL;
CLINOPYROXENE ( 30%)
Size(mm): <1 Morphology: ANHEDRAL
FRESH
OPAQUE MINERALS ( 5%)
Size(mm): <.5 Morphology: EUHEDRAL-SUBHEDRAL
INCLUDES MAGN+ILMENITE,PARTIALLY REPLACED BY
SPHENE,SOME RELICT;
SULFIDES ( <1%)
Size(mm): <1 Morphology: ANHEDRAL
APPROX COMP PYRITE,DISSEMINATED GRAINS*
TWO VEINS-ONE FILLED WITH CHLORITE MAINLY+BROWN
MATERIAL+SPHENE,MINERALS OF SECOND VEIN BROKEN OUT
BY PREPARATION;
Alteration - SPHENE ( 4%)
Location: VEIN Replacing: TI-MAGN
CLAY MINERALS
Location: IN OR CLOSE
Location: TO CHLORITE
Location: VEIN (RADIAL)
INCLUDES UNKNOWN BROWN MATERIAL;
SULFIDES ( <1%)
Location: DISSEMINATED Replacing: PYRITE
Location: THROUGH ROCK
CHLORITE ( 2%)
Replacing: OL
Leg : 83 Top/Bottom Interval(mm): 1260/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1185.00 Rock Type: IGNEOUS
Core: 116 Sample Midpoint(m) : 1186.26 Sect/Pc #: 1/PCE 19
ROCK = PLAG-OL-CPX MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC
BRECCIATED TO DENSE VERY FINE GRAINED IMMATURE
PLUMOSE WITH SOME INTERSTITIAL GLASS;
Where sampled: DIKE MARGIN*
MICROPHENOS;
Phenocrysts- OLIVINE ( 1-2%)
Size(mm): .3-.45 Morphology: SUBHEDRAL
TOTALLY REPLACED BY CHLORITE;
PLAGIOCLASE ( 3%)
Size(mm): .2-2.9 Morphology: EUHEDRAL-SUBHEDRAL
TOTALLY ALTERED,PATCHY APPEARANCE,GLOMEROCRYSTS
COMMON;
CLINOPYROXENE ( <1%)
Size(mm): .3-1 Morphology: EUHEDRAL
APPROX COMP AUGITE*
Groundmass - OLIVINE ( 1%)
Size(mm): <.15 Morphology: SUBHEDRAL-ANHEDRAL
TOTALLY ALTERED-DIFFICULT TO DISTINGUISH FROM
INTERSTITIAL CHLORITE;
PLAGIOCLASE
Size(mm): .01-.05 Morphology: SUBHEDRAL LATHS
NORMAL ZONING;
CLINOPYROXENE
Morphology: PLUMOSE
OPAQUE MINERALS ( 1-2%)
INCLUDES MAGN+ILMENITE,BADLY ALTERED ALTHOUGH NOT
TOTALLY REPLACED EXCEPT IN BRECCIA WHERE THEY ARE
TOTALLY ALTERED TO SPHENE,GENERALLY THE ROCK'S
OUTER SURFACE IS BRECCIATED INCLUDING CLASTS OF
CHILLED MARGIN AS WELL AS MORE XTLLIZED MATERIAL,
THE CHILLED BORDER ZONE IS VERY FINE GRAINED-
ALTHOUGH NOT GLASSY,XTLLIZATION IS TOO FINE TO
DISTINGUISH XTL MORPHOLOGY-GIVING SOMETHING OF A
GRANULAR APPEARANCE,THE TRANSITION FROM THE
CHILLED BORDER TO THE INTERIOR IS FAIRLY RAPID-
THAT IS-MARKED IN THIS SAMPLE*
VEINS OF CHLORITE WHICH HAVE CENTRAL PORTIONS
FILLED BY PREHNITE+BROWN MINERAL XTLLIZED IN
RADIATE/SPHERULITIC-TYPE GROWTH;
Alteration - PREHNITE
CHLORITE
Location: INTERSTICES Replacing: OL,INTERSTITIAL GLASS,
Replacing: QUENCH XTLS
ACTINOLITE ( <<1%)
Location: BRECCIATED
Location: ZONE
NEEDLES;
SULFIDES ( <1%)
Location: DISSEMINATED
Location: THROUGH ROCK
Leg : 83 Top/Bottom Interval(mm): 290/ 330 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1194.00 Rock Type: IGNEOUS
Core: 118 Sample Midpoint(m) : 1194.31 Sect/Pc #: 1/PCE 2C
ROCK = PLAG-OL-CPX SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,MEDIUM-GRAINED,SUBOPHITIC*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 1.5-2 Morphology: SUBHEDRAL
COMPLETELY REPLACED BY SMEC? OR SMEC/TALC? +
PYRITE BUT NOT CHLORITE;
PLAGIOCLASE ( 1%)
Size(mm): 1.2-2 Morphology: SUBHEDRAL
MOST FRESH,SOME PARTLY REPLACED BY CLAY MATERIAL;
CLINOPYROXENE ( <<1%)
Size(mm): 1-1.2 Morphology: SUBHEDRAL
FRESH*
Groundmass - OLIVINE
Size(mm): .2 Morphology: ANHEDRAL-SUBHEDRAL
COMPLETELY REPLACED BY CLAY MATERIAL(SAME AS FOR
OL PHENOS-SMEC OR SMEC/TALC? + PYRITE);
PLAGIOCLASE ( 46%)
Size(mm): .4-1.5 Morphology: LATHS
MOST FRESH,SOME PARTLY REPLACED BY SMEC? ALONG
CRACKS;
CLINOPYROXENE ( 46%)
Size(mm): .3-.8 Morphology: ANHEDRAL
SOME RARE XTLS REPLACED BY ACTINOLITE ON THEIR
RIMS;
TITANOMAGNETITE
PERCENTAGE UNKNOWN;
OTHER ( 3%)
INTERSTITIAL AREAS,REPLACED BY CHLORITE AND THIN
NEEDLES OF ACTINOLITE*
Alteration - ACTINOLITE
Location: INTERSTITIAL Replacing: PYX
CLAY MINERALS
Replacing: OL
INCLUDES SMEC? OR SMEC/TALC?;
CHLORITE
Location: INTERSTITIAL
SULFIDES ( 3%)
Location: DISSEMINATED Replacing: OL
Leg : 83 Top/Bottom Interval(mm): 730/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1207.50 Rock Type: IGNEOUS
Core: 121 Sample Midpoint(m) : 1208.23 Sect/Pc #: 1/PCE 9A
ROCK = PLAG-CPX SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,SUBOPHITIC;
Where sampled: DIKE INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): .8-2 Morphology: ANHEDRAL
SLIGHTLY ALTERED TO UNKNOWN MATERIAL;
CLINOPYROXENE ( <1%)
Size(mm): .8-4 Morphology: ANHEDRAL
APPROX COMP AUGITE,TWINNED AND OSCILLATORY ZONED,
SOME OPHITICALLY ENCLOSING PLAG,PARTIALLY ALTERED
AT EDGES IN INTERSTICES*
Groundmass - OLIVINE ( 4%)
Size(mm): .3-.5 Morphology: SUBHEDRAL
TOTALLY REPLACED BY POSSIBLY CHLORITE+ACTINOLITE;
PLAGIOCLASE ( 45%)
Size(mm): <2 Morphology: SUBHEDRAL
PARTIALLY REPLACED(ALBITE?:N<PLAG);
CLINOPYROXENE ( 37%)
Size(mm): <.5 Morphology: ANHEDRAL
APPROX COMP AUGITE;
OPAQUE MINERALS ( 1-2%)
Size(mm): <.15 Morphology: EQUANT EUHEDRAL
INCLUDES MAGN+ILMENITE,FRESH,SMALL BUT RARE
SPHERICAL GRANULES NOT RELATED TO MAGN;
OTHER ( 10%)
INTERSTITIAL ALTERATION*
Alteration - CHLORITE
Location: INTERSTICES Replacing: OL
SULFIDES
Location: DISSEMINATED Replacing: PYRITE
Location: THROUGH ROCK
ASSOCIATED WITH OL,ID UNCERTAIN FOR PYRITE*
Leg : 83 Top/Bottom Interval(mm): 1160/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1213.50 Rock Type: IGNEOUS
Core: 122 Sample Midpoint(m) : 1214.66 Sect/Pc #: 1/PCE 9
ROCK = PLAG-OL-CPX MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,PLUMOSE,FINE-GRAINED*
Phenocrysts- OLIVINE ( 1%)
Size(mm): .35-1.2 Morphology: SUBHEDRAL
TOTALLY ALTERED;
PLAGIOCLASE ( 3%)
Size(mm): .4-2 Morphology: SUBHEDRAL
NORMAL ZONING,UNALTERED,OCCUR IN GLOMEROCRYSTS,HAS
PATCHES OF BROWNISH BIREFRINGENT MATERIAL IN
SPACES SUGGESTIVE OF RESORBED AREAS;
CLINOPYROXENE ( <<1%)
Size(mm): <.5 Morphology: ANHEDRAL
APPROX COMP AUGITE*
Groundmass - OLIVINE ( 1-2%)
Size(mm): <.05 Morphology: EUHEDRAL
TOTALLY ALTERED;
PLAGIOCLASE ( 50%)
Size(mm): <.3 Morphology: SUBHEDRAL LATHS
NORMAL ZONING,UNALTERED;
CLINOPYROXENE ( 45%)
Size(mm): <.3 Morphology: PLUMOSE SKELETAL
MINOR ALTERATION TO BROWNISH MATERIAL IN SMALLEST
XTLS IN INTERSTICES*
Alteration - CHLORITE
Replacing: OL
ID UNCERTAIN FOR CHLORITE,ALTERS OL PHENOS AND
GROUNDMASS*
Leg : 83 Top/Bottom Interval(mm): 390/ 420 Describer: Emmermann, R.
Hole: 504B Top of Core Depth(m) : 1222.50 Rock Type: IGNEOUS
Core: 123 Sample Midpoint(m) : 1222.91 Sect/Pc #: 1/PCE 5A
ROCK = PLAG-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,GROUNDMASS FINE-GRAINED+
INTERGRANULAR;
Where sampled: DIKE*
Phenocrysts- OLIVINE ( .5%)
Size(mm): <2 Morphology: EUHEDRAL
COMPLETELY REPLACED BY TALC?+OTHER YELLOWISH-GREEN
MINERAL(SMECTITE?);
PLAGIOCLASE ( 3-4%)
Size(mm): <3 Morphology: SUBHEDRAL
FAIRLY FRESH*
Groundmass - OLIVINE ( <1%)
Size(mm): <1 Morphology: EUHEDRAL,SUBHEDRAL
COMPLETELY REPLACED BY WHITE MINERAL(TALC?)+
SMECTITE;
PLAGIOCLASE ( 60%)
Morphology: SUBHEDRAL,LATH SHAPED
CLINOPYROXENE ( 30%)
Morphology: ANHEDRAL
OPAQUE MINERALS ( 5%)
Morphology: EUHEDRAL
INCLUDES MAGN+ILMENITE,PARTLY REPLACED BY SPHENE;
GLASS
INCLUDES VOIDS,TOTALLY REPLACED BY CHLORITE;
SULFIDES ( <1%)
Size(mm): <1
APPROX COMP PYRITE,DISSEMINATED*
Alteration - SULFIDES ( <1%)
Location: DISSEMINATED Replacing: PYRITE
Location: THROUGHOUT
Location: ROCK
SMECTITE ( <1%)
Replacing: OL
ID UNCERTAIN FOR SMECTITE;
TALC ( 1%)
Replacing: OL
ID UNCERTAIN FOR TALC*
Leg : 83 Top/Bottom Interval(mm): 300/ 340 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1249.50 Rock Type: IGNEOUS
Core: 126 Sample Midpoint(m) : 1249.82 Sect/Pc #: 1/PCE 4B
ROCK = OL-PLAG-CPX-SPINEL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,MEDIUM-FINE GRAINED,
INTERGRANULAR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 1-1.5 Morphology: EUHEDRAL
COMPLETELY REPLACED BY DARK GREEN CLAY(SAPONITE?)+
VERY PALE GREEN FIBROUS MATERIAL WITH HIGH
BIREFRINGENCE(TALC) AS EXTERNAL RIM(SAME AS 83-
504B-123-1)+OPAQUE GRAINS ASSOCIATED WITH TALC;
PLAGIOCLASE ( 3%)
Size(mm): .7-1.5
FRESH,SLIGHTLY ZONED;
CLINOPYROXENE ( 1%)
Size(mm): .8-1.5 Morphology: ANHEDRAL,ROUNDED
FRESH;
SPINEL ( <1%)
Size(mm): .4 Morphology: EUHEDRAL OR ANHEDRAL
MICROCRYSTS*
Groundmass - OLIVINE ( 6%)
Size(mm): .5 Morphology: ANHEDRAL
COMPLETELY REPLACED BY THE VERY PALE GREEN FIBROUS
MATERIAL+OPAQUE GRAINS;
PLAGIOCLASE ( 42%)
Size(mm): .08-.7 Morphology: LATHS
FRESH,IN SOME AREAS THESE LATHS ARE SLIGHTLY
ORIENTED;
CLINOPYROXENE ( 43%)
Size(mm): .5 Morphology: ANHEDRAL
FRESH;
TITANOMAGNETITE ( 2%)
NO VEIN AND APPARENTLY NO CHLORITE AND ACTINOLITE;
Alteration - OTHER
Replacing: OL
REPLACING OL PHENOCRYST RIMS+ALL OL MICROCRYSTS,
VERY PALE GREEN MATERIAL(HIGH BIREFRINGENCE);
SAPONITE
Replacing: OL
REPLACING INTERNAL PARTS OF OL,DARK GREEN MINERAL;
OPAQUE MINERALS
Replacing: OL
ASSOCIATED WITH PALE GREEN MATERIAL;
SULFIDES
Location: DISSEMINATED
Leg : 83 Top/Bottom Interval(mm): 500/ 530 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1253.50 Rock Type: IGNEOUS
Core: 127 Sample Midpoint(m) : 1254.02 Sect/Pc #: 1/PCE 6
ROCK = CPX-OL-PLAG SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,MEDIUM-GRAINED,SUBOPHITIC*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 1.5 Morphology: EUHEDRAL OR SUBHEDRAL
COMPLETELY REPLACED BY DARK GREEN CLAY(SAPONITE)
AT THE CENTER AND PROBABLE TALC(OR TALC/CLAY) +
SECONDARY OPAQUES ON THE RI7;
PLAGIOCLASE ( <1%)
Size(mm): .8-1 Morphology: SUBHEDRAL
FRESH;
CLINOPYROXENE ( <1%)
Size(mm): 1.5-4 Morphology: SUBHEDRAL
FRESH,SOME PLAG LATHS OCCUR INTO THE EXTERNAL
PARTS OF THE CPX XTLS*
Groundmass - OLIVINE ( 10%)
Size(mm): .2-.4 Morphology: ANHEDRAL
COMPLETELY REPLACED BY TALC(OR TALC/SAPONITE?) +
MINOR SAPONITE + SECONDARY OPAQUES;
PLAGIOCLASE ( 40%)
Size(mm): .1-.4 Morphology: LATHS
FRESH;
CLINOPYROXENE ( 40%)
Size(mm): .3-1.5 Morphology: ANHEDRAL
FRESH;
TITANOMAGNETITE ( 5%)
Size(mm): .2
Alteration - TALC
Replacing: OL
REPLACING OL ON RIMS WITH SECONDARY OPAQUE GRAINS
(PROBABLY MAGN),THIS MATERIAL IS VERY SLIGHTLY
GREENISH-MAY NOT BE PURE TALC;
SAPONITE
Replacing: OL
DARK GREEN;
SULFIDES
MAGNETITE
Replacing: OL
Leg : 83 Top/Bottom Interval(mm): 440/ 0 Describer: Alt, J.C.
Hole: 504B Top of Core Depth(m) : 1261.00 Rock Type: IGNEOUS
Core: 128 Sample Midpoint(m) : 1261.44 Sect/Pc #: 1/PCE 4
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PHYRIC,INTERGRANULAR-SUBOPHITIC;
Where sampled: MASSIVE UNIT*
Phenocrysts- OLIVINE ( 2%)
Size(mm): .3-2.5
TOTALLY ALTERED TO TALC+OPAQUES+MINOR SMECTITE;
PLAGIOCLASE ( 10%)
Size(mm): .1-2.5 Morphology: TABULAR EUHEDRAL
ALSO AS GLOMEROCRYSTS WITH CPX;
CLINOPYROXENE ( 2%)
Size(mm): .8-2.5 Morphology: ROUNDED
OCCASIONALLY WITH INCLUSIONS OF PLAG*
Groundmass - OLIVINE ( 3%)
Size(mm): .1-.5 Morphology: EUHEDRAL-SKELETAL
TOTALLY ALTERED TO TALC+OPAQUES+SMECTITE;
PLAGIOCLASE ( 45%)
Size(mm): .2-.8 Morphology: EUHEDRAL TABULAR
PARTLY ALTERED TO SMECTITE+CHLORITE+ACTINOLITE;
CLINOPYROXENE ( 45%)
Size(mm): .5-1 Morphology: EQUANT ROUNDED
SLIGHTLY ALTERED TO ACTINOLITE;
MAGNETITE ( 7%)
Size(mm): .02-1.6 Morphology: SKELETAL
PARTLY ALTERED TO SPHENE*
ALTERATION IS PRESENT*
Leg : 83 Top/Bottom Interval(mm): 350/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1270.00 Rock Type: IGNEOUS
Core: 129 Sample Midpoint(m) : 1270.35 Sect/Pc #: 1/PCE 3B
ROCK = OL-PLAG-CPX MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,SUBOPHITIC-OPHITIC,MEDIUM
(COARSE)GRAINED*
Phenocrysts- OLIVINE ( 2-3%)
Size(mm): 3-4 Morphology: EUHEDRAL
TOTALLY REPLACED BY SAPONITE,TALC + MAGN;
PLAGIOCLASE ( 1%)
Size(mm): 3-4 Morphology: SUBHEDRAL
APPROX COMP AN60, MAY BE TWO STAGE XTLS-CORES WITH
MELT INCLUSIONS,RAGGED RIMS;
CLINOPYROXENE ( 1%)
Size(mm): 5-6 Morphology: ANHEDRAL
APPROX COMP AUGITE,MOSTLY LARGE OPHITIC OR
SUBOPHITIC XTLS,OLIVINES HAVE SPHERICAL INCLUSIONS
THAT MAY HAVE BEEN MELT INCLUSIONS,OL-PLAG-CPX
SIZE RANGES DIFFICULT TO ESTIMATE DUE TO GRAIN
SIZE*
Groundmass - OLIVINE ( 1%)
Morphology: EUHEDRAL
TOTALLY REPLACED;
PLAGIOCLASE ( 40%)
Size(mm): .4-2 Morphology: SUBHEDRAL
APPROX COMP AN40-50,IN RANDOM ORIENTATIONS;
CLINOPYROXENE ( 50%)
Morphology: ANHEDRAL
APPROX COMP AUGITE;
OPAQUE MINERALS ( 6%)
INCLUDES MAGN+ILMENITE,ALTERED SLIGHTLY TO SPHENE
AT RIMS*
Alteration - CLAY MINERALS
Replacing: OL
INCLUDES TALC AND POSSIBLY SAPONITE;
MAGNETITE
Replacing: OL
Leg : 83 Top/Bottom Interval(mm): 350/ 390 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1270.00 Rock Type: IGNEOUS
Core: 129 Sample Midpoint(m) : 1270.37 Sect/Pc #: 1/PCE 3B
ROCK = CPX-OL-PLAG PHYRIC BASALT
Texture: PHYRIC,SUBOPHITIC,MEDIUM-COARSE GRAINED
SOME AREAS ARE COARSE-GRAINED,OTHERS FINER
GRAINED*
THE RELATIVE AMOUNTS OF THE DIFFERENT CRYSTALS ARE
HARD TO EVALUATE;
Phenocrysts- OLIVINE
Size(mm): 1.8-2 Morphology: EUHEDRAL
COMPLETELY REPLACED BY SAPONITE(CENTERS) AND TALC+
MAGN(RIMS- MAGN SOMETIMES EXHIBITS CONCENTRIC
DISPOSITION)+VERY SLIGHTLY GREEN MATERIAL-GREY
WITH CROSSED NICOLS;
PLAGIOCLASE
Size(mm): 1.5-2 Morphology: SUBHEDRAL,PLATY
FRESH;
CLINOPYROXENE
Size(mm): 1.8-4 Morphology: ANHEDRAL-SUBHEDRAL
FRESH*
Groundmass - OLIVINE
Size(mm): .2-.5 Morphology: ANHEDRAL
COMPLETELY REPLACED BY SAPONITE? AND/OR TALC;
PLAGIOCLASE
Size(mm): .08-.6 Morphology: EUHEDRAL LATHS
FRESH;
CLINOPYROXENE
Size(mm): .2-.4 Morphology: ANHEDRAL
FRESH;
TITANOMAGNETITE ( 3%)
OTHER
INTERSTITIAL AREAS,REPLACED BY CHLORITE*
Leg : 83 Top/Bottom Interval(mm): 1180/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1270.00 Rock Type: IGNEOUS
Core: 129 Sample Midpoint(m) : 1272.68 Sect/Pc #: 2/PCE 10
ROCK = APHYRIC BASALT;
Texture: APHYRIC,INTERGRANULAR,MEDIUM GRAINED*
Groundmass - OLIVINE ( 5%)
Size(mm): .1-.2 Morphology: EUHEDRAL
TOTALLY ALTERED TO CHLORITE,UNCERTAIN FOR
EUHEDRAL;
PLAGIOCLASE ( 37%)
Size(mm): .1-.5 Morphology: SUBHEDRAL
APPROX COMP AN60,NORMAL ZONING;
CLINOPYROXENE ( 45%)
Size(mm): .1-.15 Morphology: ANHEDRAL
SOME DUSTY BROWN TYPE OF ALTERATION BUT MOST
FRESH;
FE-TI OXIDE ( 10%)
Morphology: EQUANT
PARTIALLY ALTERED AT RIMS*
Alteration - CHLORITE ( 3%)
Location: INTERSTICES Replacing: OL
PATCHES OF ALTERATION CONTAINING CHLORITE,
ACTINOLITE AND POSSIBLY LAUMONTITE(LOW RELIEF,LOW
BIREFRINGENCE,BIAXIAL?)*
Leg : 83 Top/Bottom Interval(mm): 1180/1210 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1270.00 Rock Type: IGNEOUS
Core: 129 Sample Midpoint(m) : 1272.70 Sect/Pc #: 2/PCE 10
ROCK = APHYRIC BASALT;
Texture: APHYRIC,VERY FINE-GRAINED,INTERGRANULAR-
INTERSERTAL*
Groundmass - OLIVINE ( 6%)
Size(mm): .3 Morphology: ANHEDRAL
COMPLETELY REPLACED BY SMEC? OR CHLORITE?(SLIGHTLY
HIGHER BIREFRINGENCE THAN CHLORITE);
PLAGIOCLASE ( 35%)
Size(mm): .08-.7 Morphology: SUBHEDRAL LATHS
SLIGHTLY ALTERED ALONG CRACKS;
CLINOPYROXENE ( 37%)
Size(mm): .05-.2 Morphology: SUBHEDRAL-ANHEDRAL(ROUNDED)
FRESH,EXCEPT WHEN IN CONTACT WITH VUGS WHERE THEY
ARE ALTERED TO CHLORITE+ACTINOLITE;
TITANOMAGNETITE ( 7%)
Size(mm): .05
PARTLY ALTERED TO SPHENE;
OTHER ( 10%)
INTERSTITIAL AREAS,REPLACED BY CHLORITE*
Alteration - CHLORITE
VESICLES ARE VUGS OF VERY IRREGULAR SHAPE FILLED
WITH PROBABLY CHLORITE AND SOME UNKNOWN MATERIAL,
THERE IS A THIN(.07 MM) VEIN FILLED WITH GREEN
MATERIAL(BUT WITH HIGHER BIREFRINGENCE THAN
CHLORITE) AT THE CENTER AND COLORLESS MATERIAL
AT THE RIMS-SAME FILLING AS IN VUGS*
Leg : 83 Top/Bottom Interval(mm): 310/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1270.00 Rock Type: IGNEOUS
Core: 129 Sample Midpoint(m) : 1273.31 Sect/Pc #: 3/PCE 5
ROCK = PLAG-CPX SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,CRYPTOXTLLINE-VERY FINELY
CRYPTOXTLLINE;
Where sampled: INTRUSIVE FINGER OF BASALT*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): .4-.9 Morphology: EUHEDRAL
PATCHY TO TOTAL ALTERATION,A FEW GLOMEROCRYSTS;
CLINOPYROXENE ( <1%)
Size(mm): .35-2 Morphology: EUHEDRAL
APPROX COMP AUGITE,TWINNED*
Groundmass - OLIVINE ( <1%)
Size(mm): .05-.2 Morphology: EUHEDRAL
TOTALLY ALTERED TO CHLORITE,MICROPHENOS;
PLAGIOCLASE ( 1%)
Size(mm): .04-.2 Morphology: ELONGATE,SKELETAL
MICROPHENOS;
CLINOPYROXENE ( <1%)
Size(mm): .04-.08 Morphology: ANHEDRAL
APPROX COMP AUGITE,MICROPHENOS,GROUNDMASS TEXTURE
RANGES FROM ALTERED GLASSY(?) MARGIN TO VERY
FINELY XTLLINE TO SPHERULITIC TO PLUMOSE IN THE
CENTER,ALTERED OLIVINE MICROPHENOS OCCUR IN THE
PLUMOSE AREA,MAY BE SOME FRAGMENTS OF ALTERED
GLASS AT ONE END OF THE SLIDE*
Leg : 83 Top/Bottom Interval(mm): 311/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1270.00 Rock Type: IGNEOUS
Core: 129 Sample Midpoint(m) : 1273.31 Sect/Pc #: 3/PCE 5
ROCK = APHYRIC BASALT;
Texture: APHYRIC,VERY FINE GRAINED,INTERGRANULAR;
Where sampled: HOST MATERIAL*
Groundmass - OLIVINE
MAY HAVE BEEN PRESENT BUT NOW TOTALLY ALTERED;
PLAGIOCLASE ( 50%)
Size(mm): <.2 Morphology: SUBHEDRAL
FAIRLY FRESH;
CLINOPYROXENE ( 40%)
Size(mm): .02-.1 Morphology: ANHEDRAL
APPROX COMP AUGITE,ALTERED TO BROWNISH MATERIAL-
PROBABLY CHLORITE AND ACTINOLITE;
OPAQUE MINERALS ( 2%)
Size(mm): .01-.05
INCLUDES MAGN + ILMENITE,ALTERED TO SPHENE
POSSIBLY SOME TO PYRITE PERHAPS,CHLORITE (AND
ALTERATION IN GENERAL) GENERALLY CONFINED TO VEINS
BUT LOCALLY SEEMS TO BE ENGULFING THE ROCK,DEGREE
OF ALTERATION DIFFICULT TO ASSESS DUE TO POOR
SLIDE QUALITY*
Alteration - OTHER
UNIDENTIFIED SPHERULITIC-LIKE PALE BROWN MINERAL
ASSOCIATED WITH LAUMONTITE IN VEINS OR PATCHES;
LAUMONTITE
ID UNCERTAIN FOR LAUMONTITE-LOW BIREFRINGENT
MINERAL IN CENTER OF VEINS-ALSO HAS ACTINOLITE;
CHLORITE
Location: IN VEINS AND
Location: INTERSTITIAL
ACTINOLITE
GROWS INTO VEINS FROM AUGITES ADJACENT TO VEINS;
PYRITE
Location: DISSEMINATED
Location: THROUGH ROCK
Leg : 83 Top/Bottom Interval(mm): 70/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1279.00 Rock Type: IGNEOUS
Core: 130 Sample Midpoint(m) : 1280.57 Sect/Pc #: 2/PCE 1A
ROCK = PLAG-OL-CPX MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,SUBOPHITIC,MEDIUM-GRAINED;
Phenocrysts- OLIVINE ( 1%)
Size(mm): .5-2.2 Morphology: EUHEDRAL
CLAY CORES WITH TALC RIMS;
PLAGIOCLASE ( 4%)
Size(mm): .8-2 Morphology: SUBHEDRAL
APPROX COMP AN70,ELONGATE HOLES (MELTING),
OSCILLATORY ZONING;
CLINOPYROXENE ( 1%)
Size(mm): 2-2.5 Morphology: ANHEDRAL
APPROX COMP AUGITE*
Groundmass - OLIVINE ( 3%)
Size(mm): .1-.3 Morphology: EUHEDRAL
REPLACED BY TALC;
PLAGIOCLASE ( 45%)
Size(mm): .2-1.2 Morphology: SUBHEDRAL
APPROX COMP AN55,NORMAL ZONING,SOME FRACTURES
WITH ALTERATION;
CLINOPYROXENE ( 43%)
Size(mm): .2-.8 Morphology: ANHEDRAL
APPROX COMP AUGITE;
OPAQUE MINERALS ( 3%)
Morphology: EQUANT
FRESH,INCLUDES MAGN + ILMENITE*
Alteration - CHLORITE
Location: INTERSTITIAL
TALC
Replacing: OL
ID UNCERTAIN FOR TALC;
MAGNETITE
Replacing: WITH TALC IN OL
Leg : 83 Top/Bottom Interval(mm): 90/ 120 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1279.00 Rock Type: IGNEOUS
Core: 130 Sample Midpoint(m) : 1280.60 Sect/Pc #: 2/PCE 1A
ROCK = PLAG-OL-CPX-SPINEL SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,MEDIUM-COARSE GRAINED,
SUBOPHITIC*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 1.5-2.2 Morphology: EUHEDRAL-SUBHEDRAL
COMPLETELY REPLACED BY SAPONITE+TALC+OPAQUES;
PLAGIOCLASE ( 1%)
Size(mm): .6-.7 Morphology: SUBHEDRAL LATHS
FRESH;
CLINOPYROXENE ( <1%)
Size(mm): 1.3-2 Morphology: SUBHEDRAL
FRESH;
SPINEL ( .2%)
Morphology: MICROCRYSTS,EUHEDRAL
Groundmass - OLIVINE ( 10%)
Size(mm): .15 Morphology: ANHEDRAL
COMPLETELY REPLACED BY TALC AND POSSIBLY MAGN;
PLAGIOCLASE ( 42%)
Size(mm): .2-.5 Morphology: SUBHEDRAL LATHS
FRESH;
CLINOPYROXENE ( 40%)
Size(mm): .3-.8 Morphology: ANHEDRAL
FRESH;
MAGNETITE ( 3%)
Size(mm): .06
INTERSTITIAL AREAS WHOSE COMPOSITION IS HARD TO
EVALUATE ARE REPLACED BY POSSIBLY CHLORITE+SMEC*
Alteration - TALC
Replacing: OL
SMECTITE
Replacing: OL
DARK GREEN;
MAGNETITE
Replacing: OL
Leg : 83 Top/Bottom Interval(mm): 670/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1287.50 Rock Type: IGNEOUS
Core: 131 Sample Midpoint(m) : 1288.17 Sect/Pc #: 1/PCE 7
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,FINE GRAINED,SUBOPHITIC*
Phenocrysts- OLIVINE ( 2%)
Size(mm): .5-1.5 Morphology: EUHEDRAL
TOTALLY ALTERED TO CLAYS;
PLAGIOCLASE ( 3%)
Size(mm): .5-2.5 Morphology: EUHEDRAL
GLOMEROCRYSTS,NORMAL ZONING,RESORBED CORES
SLIGHTLY;
CLINOPYROXENE ( 2-3%)
Size(mm): 3-4 Morphology: ANHEDRAL
APPROX COMP AUGITE,LATE STAGE GROWTH INTERGROWN
WITH GROUNDMASS PLAG*
Groundmass - OLIVINE ( 5%)
Size(mm): .1-.25 Morphology: EUHEDRAL-SUBHEDRAL
TOTALLY ALTERED;
PLAGIOCLASE ( 40%)
Size(mm): .1-1 Morphology: SUBHEDRAL
FRESH,NORMAL ZONING;
CLINOPYROXENE ( 40%)
Size(mm): .4-.6 Morphology: ANHEDRAL
APPROX COMP AUGITE,ALTERATION TO CHLORITE NEAR
CHLORITE IN INTERSTICES;
OPAQUE MINERALS ( 7-8%)
Size(mm): .05-.6 Morphology: EQUANT-SKELETAL
ALTERED TO SPHENE*
INTERSTITIAL AREAS FILLED WITH CHLORITE + SPHENE;
Alteration - CLAY MINERALS
Replacing: OL(TWO STAGES)
CORES PALE BROWN,RIMS COLORLESS*
Leg : 83 Top/Bottom Interval(mm): 570/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1287.50 Rock Type: IGNEOUS
Core: 131 Sample Midpoint(m) : 1289.57 Sect/Pc #: 2/PCE 6
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,FINE-MEDIUM GRAINED,
INTERGRANULAR;
Phenocrysts- OLIVINE ( 1%)
Size(mm): .4-.5 Morphology: EUHEDRAL
TOTALLY ALTERED;
PLAGIOCLASE ( 4-5%)
Size(mm): .4-1.5 Morphology: SUBHEDRAL
MINOR GLOMEROCRYSTS-LARGE ONES SLIGHTLY RESORBED,
NORMAL TO OSCILLATORY ZONING;
CLINOPYROXENE ( 2-3%)
Size(mm): .2-4.5 Morphology: SUBHEDRAL
APPROX COMP AUGITE,SOME IN GLOMEROCRYSTS TWINNED*
Groundmass - OLIVINE
PROBABLY PRESENT BUT DIFFICULT TO DISTINGUISH FROM
CHLORITE OCCURING INTERSTITIALLY;
PLAGIOCLASE ( 35%)
Size(mm): .1-.5 Morphology: SUBHEDRAL
FRESH,NORMAL ZONED;
CLINOPYROXENE ( 45%)
Size(mm): .05-.2 Morphology: ANHEDRAL
APPROX COMP AUGITE,RELATIVELY FRESH ALTHOUGH THERE
IS A DUSTY ALTERATION;
OPAQUE MINERALS ( 7%)
Size(mm): .02-.15 Morphology: EQUANT,SUBHEDRAL
INCLUDES MAGN + ILMENITE,FRESH TO SLIGHTLY
ALTERED TO SPHENE,THERE IS NO OBVIOUS CHANGE IN
XTL MORPHOLOGY OR GRAIN SIZE ACROSS THE SLIDE AS
APPEARED TO BE THE CASE IN THE HAND SPECIMEN-
HOWEVER PLAG MAY BE LARGER ON ONE SIDE IF
SYSTEMATICALLY MEASURED*
Alteration - SPHENE
CHLORITE ( 4-5%)
Location: INTERSTITIAL Replacing: OL
OCCURS WITH SPHENE,ALSO IN SMALL VEINS .05 MM
WIDE;
PYRITE
MINOR-DISSEMINATED THROUGH ROCK*
Leg : 83 Top/Bottom Interval(mm): 960/ 0 Describer: Alt, J.C.
Hole: 504B Top of Core Depth(m) : 1295.00 Rock Type: IGNEOUS
Core: 132 Sample Midpoint(m) : 1295.96 Sect/Pc #: 1/PCE 13
ROCK = PLAG-CPX-OL-SPINEL PHYRIC BASALT;
Texture: PHYRIC,SUBOPHITIC;
Where sampled: MASSIVE UNIT*
Phenocrysts- OLIVINE ( 5%)
Size(mm): .3-.6 Morphology: EUHEDRAL
REPLACED WITH TALC,MAGNETITE,CHLORITE,SMECTITE;
PLAGIOCLASE ( 15%)
Size(mm): .4-1.8 Morphology: ANHEDRAL
PARTLY REPLACED BY TALC + CHLORITE;
CLINOPYROXENE ( 8%)
Size(mm): .8-1.6 Morphology: ANHEDRAL
SPINEL ( <1%)
Size(mm): .05-.1 Morphology: EUHEDRAL
Groundmass - OLIVINE ( 5%)
Size(mm): .05-.15
REPLACED WITH TALC+MAGN+CHLORITE+SMECTITE;
PLAGIOCLASE ( 40%)
Size(mm): .05-.2 Morphology: EUHEDRAL LATHS
PARTLY REPLACED BY TALC+CHLORITE;
CLINOPYROXENE ( 40%)
Size(mm): .05-.5 Morphology: ANHEDRAL EQUANT
OCCASIONALLY REPLACED WITH ACTINOLITE OVERGROWTHS;
MAGNETITE ( 5%)
Size(mm): .01-.1
PARTLY REPLACED BY SPHENE*
Alteration - CLAY MINERALS
Replacing: OL
ACTINOLITE
Vesicles -
Size(mm): 1
Percent: 3
Filling: CHLORITE AND
Shape: IRREGULAR
Filling: ACTINOLITE
VESICLES ARE VUGS*
Leg : 83 Top/Bottom Interval(mm): 1150/1190 Describer: Laverne, C.
Hole: 504B Top of Core Depth(m) : 1304.00 Rock Type: IGNEOUS
Core: 133 Sample Midpoint(m) : 1305.17 Sect/Pc #: 1/PCE 14
ROCK = CPX SPARSELY PHYRIC BASALT;
Texture: SPARSELY PHYRIC,MEDIUM-GRAINED SUBOPHITIC-
INTERGRANULAR*
Phenocrysts- CLINOPYROXENE ( <1%)
Size(mm): .6-.8 Morphology: SUBHEDRAL
FRESH*
Groundmass - PLAGIOCLASE ( 48%)
Size(mm): .05-.4 Morphology: ELONGATED LATHS
SOME CRYSTALS BENT,PARTLY ALTERED INTO ALBITE? AND
MINOR CHLORITE;
CLINOPYROXENE ( 49%)
Size(mm): .1-.2 Morphology: SUBHEDRAL
PARTLY OR COMPLETELY ALTERED,REPLACED BY
ACTINOLITE AND CHLORITE AND UNKNOWN SEMI-OPAQUE
GRAINS;
MAGNETITE ( 3%)
Size(mm): .6 Morphology: SUBHEDRAL
STRONGLY ALTERED BY SPHENE,NO SHAPE OF OLD OL
PHENOS OR MICROCRYSTS HAS BEEN OBSERVED*
Alteration - CHLORITE
Location: PATCHES OF Replacing: CPX,MINOR PLAG
Location: ALTERATION
ACTINOLITE
Replacing: CPX
SPHENE
Replacing: MAGN
PATCHES OF ALTERATION DESCRIBED IN HAND SPECIMEN
ARE COMPOSED OF FINELY XTLLINE CHLORITE AREAS +
STRONGLY ALTERED PLAG + CPX + MAGN CRYSTALS*
Leg : 83 Top/Bottom Interval(mm): 270/ 0 Describer: Kempton, P.
Hole: 504B Top of Core Depth(m) : 1313.00 Rock Type: IGNEOUS
Core: 134 Sample Midpoint(m) : 1313.27 Sect/Pc #: 1/PCE 4
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PHYRIC,MEDIUM-GRAINED,SUBOPHITIC,
INTERGRANULAR*
Phenocrysts- OLIVINE ( 1%)
Size(mm): .5-1.5 Morphology: EUHEDRAL
TOTALLY ALTERED;
PLAGIOCLASE ( 4-5%)
Size(mm): .2-2 Morphology: SUBHEDRAL-EUHEDRAL
NORMAL ZONED,DISTINCT CORE/RIM GLOMEROCRYSTS;
CLINOPYROXENE ( 2%)
Size(mm): 1-4 Morphology: SUBHEDRAL-ANHEDRAL
APPROX COMP AUGITE,LARGE XTLS OPHITICALLY ENCLOSE
SMALL PLAG,HAS LATE STAGE NUCLEATION OF PLAG AT
RIMS*
Groundmass - OLIVINE
Morphology: EUHEDRAL
PERCENTAGE DIFFICULT TO ESTIMATE,ID UNCERTAIN FOR
EUHEDRAL,TOTALLY ALTERED TO CHLORITE;
PLAGIOCLASE ( 40%)
Size(mm): .1-.5 Morphology: SUBHEDRAL
PARTIALLY REPLACED BY POSSIBLY ALBITE;
CLINOPYROXENE ( 45%)
Size(mm): .05-.4 Morphology: ANHEDRAL
APPROX COMP AUGITE,MORPHOLOGY VARIES FROM EQUANT
TO ELONGATE;
OPAQUE MINERALS ( 2%)
Size(mm): <.03 Morphology: EQUANT
INCLUDES MAGN+ILMENITE,PARTIALLY ALTERED,OCCURS
IN ALTERED PATCHES*
Alteration - CHLORITE ( 5%)
Location: INTERSTITIAL Replacing: OL
Location: AREAS+SPHENE
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