Leg : 77 Top/Bottom Interval(mm): 570/ 0 Describer:
Hole: 538A Top of Core Depth(m) : 268.50 Rock Type: METAMORPHIC
Core: 30 Sample Midpoint(m) : 269.07 Sect/Pc #: 1/
ROCK = AUGEN GNEISS;
Texture: PORPHYROBLASTIC,SLIGHTLY MYLONITIC*
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): 0.1-2.0 Morphology: PERTHITIC
APPROX COMP AN 0,PORPHYROBLASTS WITH OR;
MAGNETITE ( 0.5%)
Size(mm): 0.5 Morphology: SUBHEDRAL,CUBIC
ID UNCERTAIN FOR MAGN,NO PREFERRED DISTRIBUTION;
EPIDOTE ( 1%)
Size(mm): .1-.3 Morphology: PRISMATIC
PLEOCHROIC(CLEAR TO GREEN);
QUARTZ ( 50%)
Size(mm): .04-2.0 Morphology: IRREGULAR,STRAINED
METAQUARTZ,SOME C-AXES ALIGNED;
ALKALI FELDSPAR ( 15%)
Size(mm): .1-2.0 Morphology: CARLSBAD TWINS
APPROX COMP OR, PORPHYROBLASTS WITH AB;
BIOTITE ( 5%)
Size(mm): .1-.5 Morphology: PLATELETS
PARALLEL ALIGNMENT;
SPHENE ( .5%)
Size(mm): .1-.3 Morphology: RHOMB/PRISMATIC
GOOD RHOMBOHEDRAL CLEAVAGE*
Leg : 77 Top/Bottom Interval(mm): 570/ 0 Describer: Pisciotto, K.
Hole: 538A Top of Core Depth(m) : 268.50 Rock Type: METAMORPHIC
Core: 30 Sample Midpoint(m) : 270.57 Sect/Pc #: 2/
ROCK = AUGEN GNEISS;
Texture: PORPHYROBLASTIC, SLIGHTLY MYLONITIC*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): .1-2.0 Morphology: PERTHITIC INTERGROWTHS
APPROX COMP AB, PORPHYROBLASTS WITH OR;
MAGNETITE ( 5%)
Size(mm): .5 Morphology: SUBHEDRAL,CUBIC
ID UNCERTAIN FOR MAGN;
EPIDOTE ( 1%)
Size(mm): .1-.3 Morphology: PRISMATIC
PLEOCHROIC(CLEAR TO GREEN);
QUARTZ ( 40%)
Size(mm): .04-2 Morphology: IRREGULAR,STRAINED
METAQUARTZ,SOME C-AXES ALIGNED;
ALKALI FELDSPAR ( 20%)
Size(mm): .1-2.0 Morphology: CARLSBAD TWINS
APPROX COMP OR, PORPHYROBLASTS WITH AB;
BIOTITE ( 15%)
Size(mm): .1-.5 Morphology: PLATELETS
PARALLEL ALIGNMENT;
SPHENE ( TR%)
Size(mm): .1-.3 Morphology: PRISMATIC
GOOD RHOMBOHEDRAL CLEAVAGE*
Leg : 77 Top/Bottom Interval(mm): 150/ 0 Describer: Pisciotto, K.
Hole: 538A Top of Core Depth(m) : 278.00 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 278.15 Sect/Pc #: 1/
ROCK = DIABASE;
Texture: INTERSERTAL TO SUBOPHITIC;
Where sampled: DIKE ROCK
ID UNCERTAIN FOR DIKE ROCK*
Phenocrysts- PLAGIOCLASE ( .5%)
Size(mm): 3 Morphology: LATHS
APPROX COMP AN48-56, RARE PHENOCRYSTIC FELDSPAR
CARLSBAD TWINS*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): .01-.02 Morphology: LATHS
AB TWINS, APPROX COMP AN48-56;
CLINOPYROXENE ( 50%)
Size(mm): .01-.02
ALT. TO GREEN CLAY AND SMEC;
MAGNETITE ( 10%)
Size(mm): .01-1.0 Morphology: SMALL SKELETAL AND CUBIC
Alteration - CARBONATE
Location: ALT.PYX
LOCATION UNCERTAIN FOR ALT.PYX;
CLAY MINERALS ( 45%)
ALTERATION OF PYX,NO XTL FORMS*
Leg : 77 Top/Bottom Interval(mm): 450/ 0 Describer: Pisciotto, K.
Hole: 538A Top of Core Depth(m) : 278.00 Rock Type: METAMORPHIC
Core: 31 Sample Midpoint(m) : 279.95 Sect/Pc #: 2/
ROCK = AMPHIBOLITE;
Texture: RELIC OPHITIC*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .2-.5 Morphology: XENOBLASTIC EQUANT
AB AND PERICLINE TWINS;
HORNBLENDE ( 50%)
Size(mm): .2 Morphology: PRISMATIC,IDIOBLASTIC
GREEN,PLEOCHROIC;
SPHENE ( <1%)
Size(mm): .2 Morphology: EQUANT
Leg : 77 Top/Bottom Interval(mm): 780/ 0 Describer: Pisciotto, K.
Hole: 538A Top of Core Depth(m) : 278.00 Rock Type: METAMORPHIC
Core: 31 Sample Midpoint(m) : 280.28 Sect/Pc #: 2/
ROCK = AUGEN GNEISS;
Texture: PORPHYROBLASTIC,SLIGHTLY MYLONITIC*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): .1-3 Morphology: PERTHITIC INTERGROWTHS AND
Morphology: PORPHYROBLASTS WITH OR
APPROX COMP AB;
MAGNETITE ( <1%)
Size(mm): .5 Morphology: SUBHEDRAL,CUBIC
NO PREFERRED ORIENTATION;
BIOTITE ( 5%)
Size(mm): .005-.2 Morphology: PLATY
PLEOCHROIC PLATES THAT RIM PORPHYROBLASTS;
QUARTZ ( 40%)
Size(mm): .04-.5 Morphology: PORPHYROBLASTS,REXTLLIZED
STRAINED WITH GOOD C-AXIS ORIENTATION;
ALKALI FELDSPAR ( 25%)
Size(mm): .1-3 Morphology: PERTHITIC INTERGROWTHS AND
Morphology: PORPHYROBLASTS WITH OR
EPIDOTE ( <1%)
Size(mm): .1-3 Morphology: PRISMATIC
PLEOCHROIC(CLEAR TO GREEN);
SPHENE ( <1%)
Size(mm): .1-.3 Morphology: PRISMATIC
GOOD RHOMB. CLEAVAGE*
Alteration - CLAY MINERALS ( 1%)
Replacing: BIOTITE
Leg : 77 Top/Bottom Interval(mm): 1260/ 0 Describer: Pisciotto, K.
Hole: 538A Top of Core Depth(m) : 278.00 Rock Type: METAMORPHIC
Core: 31 Sample Midpoint(m) : 280.76 Sect/Pc #: 2/
ROCK = AMPHIBOLITE;
Texture: RELIC OPHITIC*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .1-.8 Morphology: XENO BLASTIC,UNTWINNED
APPROX COMP AN40,FEW AB TWINS,EQUANT XTLS;
HORNBLENDE ( 50%)
Size(mm): .1-.4 Morphology: PRISMATIC
GREEN,PLEOCHROIC,GOOD CLEAVAGE;
SPHENE ( <1%)
Size(mm): .2 Morphology: EQUANT
ASSOCIATED WITH HBL*
Leg : 77 Top/Bottom Interval(mm): 570/ 600 Describer: Pisciotto, K.
Hole: 538A Top of Core Depth(m) : 287.50 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 291.09 Sect/Pc #: 3/PCE 4A
ROCK = DIABASE;
Texture: SUBOPHITIC-OPHITIC,MEDIUM-GRAINED*
Groundmass - PLAGIOCLASE ( 55%)
Size(mm): .2-2 Morphology: LATHS
APPROX COMP AN30-65,CARLSBAD AND AB TWINS;
CLINOPYROXENE ( 40%)
Size(mm): .2-1.2 Morphology: OPHITIC INTERGROWTHS WITH
Morphology: PLAG
APPROX COMP AUGITE;
MAGNETITE ( <1%)
Size(mm): .5 Morphology: SKELETAL
ID UNCERTAIN FOR MAGN, ALSO OCCURS BETWEEN PLAG
AND AUGITE;
ALTERED GLASS ( 5%)
Size(mm): .2 Morphology: INTERSTITIAL
ALT. TO GREEN CLAY*
Alteration - CLAY MINERALS ( 5%)
Location: INTERSTITIAL Replacing: GLASS
Leg : 77 Top/Bottom Interval(mm): 820/ 830 Describer: Pisciotto, K.
Hole: 538A Top of Core Depth(m) : 296.50 Rock Type: METAMORPHIC
Core: 33 Sample Midpoint(m) : 297.33 Sect/Pc #: 1/PCE 6C
ROCK = ALTERED GNEISS;
Texture: NO SPECIFIC TEX
CONTACT BETWEEN GNEISS AND DIABASE,TEXTURALLY AND
COMPOSITIONALLY A HYBRID*
Groundmass - PLAGIOCLASE ( 5%)
Size(mm): .2-1 Morphology: RELIC LATHS
APPROX COMP UNKNOWN, ALT. TO CLAYS;
BIOTITE ( 5%)
Size(mm): .2 Morphology: PLATY
Alteration - CARBONATE ( 50%)
Location: THROUGHOUT Replacing: PYX,PLAG
SOME MAY BE ORIGINAL FROM GNEISS;
CLAY MINERALS ( 40%)
Location: THROUGHOUT Replacing: PYX,PLAG
CONTACT ZONE BETWEEN GNEISS AND DIABASE SO ROCK
IS TEXTURALLY AND COMPOSITIONALLY A HYBRID*
Leg : 77 Top/Bottom Interval(mm): 590/ 630 Describer: Pisciotto, K.
Hole: 538A Top of Core Depth(m) : 296.50 Rock Type: METAMORPHIC
Core: 33 Sample Midpoint(m) : 300.11 Sect/Pc #: 3/PCE 5B
ROCK = AMPHIBOLITE;
Texture: RELIC OPHITIC;
NOT MUCH LINEATION*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .2-.5 Morphology: XENOBLASTIC EQUANT
APPROX COMP AN35-45, AB AND PERICLINE TWINS;
MAGNETITE ( 1%)
Size(mm): .3 Morphology: SUBHEDRAL
ID UNCERTAIN FOR MAGN,ASSOCIATED WITH HBL;
HORNBLENDE ( 50%)
Size(mm): .2 Morphology: PRISMATIC,IDIOBLASTIC
GREEN PLEOCHROIC*
SPHENE ( <1%)
Size(mm): .2 Morphology: EQUANT
Leg : 77 Top/Bottom Interval(mm): 410/ 430 Describer: Pisciotto, K.
Hole: 538A Top of Core Depth(m) : 305.50 Rock Type: METAMORPHIC
Core: 34 Sample Midpoint(m) : 305.92 Sect/Pc #: 1/PCE 2
ROCK = AMPHIBOLITE;
Texture: RELIC OPHITIC*
Groundmass - PLAGIOCLASE ( 55%)
Size(mm): .2-.4 Morphology: IDIOBLASTIC,EQUANT
STRONG LINEATION;
HORNBLENDE ( 40%)
Size(mm): .05-1 Morphology: XENOBLASTIC INTERGROWTHS
OPAQUE MINERALS ( 5%)
Size(mm): .1-.2 Morphology: IRREGULAR,SUBHEDRAL
POSSIBLY INCLUDES MAGN, OCCURS MAINLY IN CENTERS
OF HBL XTLS*
Leg : 77 Top/Bottom Interval(mm): 210/ 240 Describer: Pisciotto, K.
Hole: 538A Top of Core Depth(m) : 305.50 Rock Type: METAMORPHIC
Core: 34 Sample Midpoint(m) : 307.22 Sect/Pc #: 2/PCE 1B
ROCK = GNEISS XENOLITH IN AMPHIBOLITE;
Groundmass - BIOTITE ( 10%)
Size(mm): .1-.3 Morphology: RAGGED,PLATY
ALTERED TO GREEN MICA/CLAY;
QUARTZ ( 60%)
Size(mm): .1-2 Morphology: STRAINED,SUTURED
ORTHOCLASE ( 30%)
Size(mm): .5-2 Morphology: LARGE PORPHYROBLASTS
SERICITIZED;
BIOTITE+OR+QUARTZ ARE FOR GNEISS;
PLAGIOCLASE ( 50%)
Size(mm): .2-.4 Morphology: EQUANT
APPROX COMP UNKNOWN, SOME CARLSBAD AND MINOR AB
TWINS, SERICITIZED;
HORNBLENDE ( 15%)
Size(mm): .2-.5 Morphology: PLATY,RAGGED
ALTERED HBL/BIOTITE,GREENISH MICA W/ BLUISH
BIREFRINGENCE;
HORNBLENDE ( 35%)
Size(mm): .2-.5 Morphology: PRISMATIC,RAGGED,FRACTURED
EPIDOTE ( TR%)
Size(mm): .2-.5 Morphology: EQUANT
ALONG CONTACT WITH GNEISS;
ALT.HBL/BIOTITE+HBL+EPIDOTE ARE FOR AMPHIBOLITE*
Leg : 77 Top/Bottom Interval(mm): 420/ 460 Describer: Pisciotto, K.
Hole: 538A Top of Core Depth(m) : 305.50 Rock Type: METAMORPHIC
Core: 34 Sample Midpoint(m) : 308.94 Sect/Pc #: 3/PCE 6
ROCK = MYLONITIC AUGEN GNEISS;
Texture: PORPHYROBLASTIC, STRONGLY MYLONITIC;
Groundmass - PLAGIOCLASE ( 7%)
Size(mm): .2-2 Morphology: PERTHITIC WITH ORTHOCLASE
APPROX COMP AB, IN PORPHYROBLASTS WITH OR;
GLASS ( 80%)
Size(mm): .2-1.5 Morphology: GRANULAR
STRAINED GRAINS WITH IRREGULAR SUTURED CONTACTS;
ALKALI FELDSPAR ( 7%)
Size(mm): .2-2
APPROX COMP OR,IN PORPHYROBLASTS WITH AB;
BIOTITE ( 5%)
Size(mm): .1 Morphology: PLATY
STRONGLY ALIGNED WITH SHEAR PLANES;
EPIDOTE ( <1%)
Size(mm): .1
BROKEN GRANULES ALONG SHEAR PLANES*
Alteration - SERICITE ( 1%)
Location: FELDSPAR
Location: PORPHYROBLAST
Leg : 77 Top/Bottom Interval(mm): 340/ 0 Describer: Pisciotto, K.
Hole: 538A Top of Core Depth(m) : 314.50 Rock Type: IGNEOUS
Core: 35 Sample Midpoint(m) : 314.84 Sect/Pc #: 1/PCE 1F
ROCK = ALTERED DIABASE;
Texture: INTERSERTAL TO SUBOPHITIC,
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): .1-.5 Morphology: LATHS
APPROX COMP AN38-46,SOME ALTERATION;
CLINOPYROXENE ( 10%)
Size(mm): .1-.5 Morphology: GRANULAR,CORRODED
MAGNETITE ( 5%)
Size(mm): .1-.2 Morphology: CUBIC,PYRAMIDAL,SKELETAL
ID UNCERTAIN FOR MAGN,NOT ALTERED,BETWEEN PLAG AND
PYX;
ALTERED GLASS ( 5%)
Morphology: INTERSTITIAL
CONSISTS OF GREEN CLAY,BETWEEN FELDSPAR LATHS;
AUGITE ( 40%)
Size(mm): .1-.5 Morphology: GRANULAR,SUBOPH INTERGROWTHS
Morphology: (ALTERED)
APPROX COMP POSSIBLY CLAY,ALTERED;
BIOTITE ( <1%)
Size(mm): .0 Morphology: 6PLATELETS
INTERGROWN WITH PLAG AND AUGITE*
Leg : 77 Top/Bottom Interval(mm): 930/ 0 Describer: Pisciotto, K.
Hole: 538A Top of Core Depth(m) : 314.50 Rock Type: IGNEOUS
Core: 35 Sample Midpoint(m) : 319.93 Sect/Pc #: 4/PCE 1H
ROCK = DIABASE;
Texture: INTERSERTAL-SUBOPHITIC*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): .2-.4 Morphology: LATHS
ZONED,APPROX COMP AN33-42;
CLINOPYROXENE ( 35%)
Size(mm): .1-.3 Morphology: SUBOPHITIC INTERGROWTHS
MAGNETITE ( 5%)
Size(mm): .2 Morphology: CUBIC AND SKELETAL
ID UNCERTAIN FOR MAGN;
ALTERED GLASS ( 20%)
Morphology: INTERSTITIAL
ALTERED TO GREEN CLAY;
BIOTITE ( <1%)
Size(mm): .1 Morphology: PLATY
INTERGROWTHS WITH PYX+PLAG*
Leg : 77 Top/Bottom Interval(mm): 650/ 0 Describer: Pisciotto, K.
Hole: 538A Top of Core Depth(m) : 323.50 Rock Type: IGNEOUS
Core: 36 Sample Midpoint(m) : 324.15 Sect/Pc #: 1/PCE 6
ROCK = DIABASE;
Texture: INTERSERTAL-SUBOPHITIC*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): .5-1 Morphology: LATHS
ZONED,APPROX COMP AN38-45;
CLINOPYROXENE ( 35%)
Size(mm): .2-.5 Morphology: INTERGROWTHS WITH PLAG
APPROX COMP AUGITE;
MAGNETITE ( TR%)
Size(mm): .2 Morphology: SKELETAL AND CUBIC
LOCATED AROUND PLAG,ID UNCERTAIN FOR MAGN;
ALTERED GLASS ( 20%)
Morphology: INTERSTITIAL
CONSISTS OF GREEN CLAY;
BIOTITE ( 1%)
Size(mm): .1 Morphology: PLATY
INTERGROWTHS WITH PYX AND PLAG*
Leg : 77 Top/Bottom Interval(mm): 480/ 0 Describer: Pisciotto, K.
Hole: 538A Top of Core Depth(m) : 323.50 Rock Type: IGNEOUS
Core: 36 Sample Midpoint(m) : 326.98 Sect/Pc #: 3/
ROCK = ALTERED DIABASE
ALTERED ZONE IN DIABASE;
Texture: ALTERED DIABASE ZONE*
Groundmass - CLINOPYROXENE ( 10%)
Size(mm): .1-.5 Morphology: GRANULAR ENCLOSED BY MICA
CLAY MINERALS ( 10%)
ASSOCIATED WITH PYX AND MICA;
MUSCOVITE ( 80%)
Size(mm): .5-4 Morphology: RADIATING WEDGES,TWINNED
WHITE MICA, 2V -15*
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