Leg : 81 Top/Bottom Interval(mm): 690/ 0 Describer: Morton, A.C.
Hole: 552 Top of Core Depth(m) : 279.00 Rock Type: IGNEOUS
Core: 21 Sample Midpoint(m) : 282.69 Sect/Pc #: 3/
ROCK = PLAG-CPX PHYRIC BASALT
EXTENSIVELY ALTERED;
Texture: PORPHYRITIC,VESICULAR;
Where sampled: FLOW TOP*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): .5-1 Morphology: LATHS
LABRADORITE,APPROX COMP AN55;
CLINOPYROXENE ( 1%)
Size(mm): .2
APPROX COMP AUGITE*
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): <.1 Morphology: LATHS
APPROX COMP UNKNOWN*
Alteration - CLAY MINERALS ( 54%)
Location: GROUNDMASS Replacing: GROUNDMASS
PYRITE ( 15%)
Location: GROUNDMASS Replacing: ILMENITE + GROUNDMASS
ID UNCERTAIN FOR ILMENITE WHICH POSSIBLY EXISTED
IN PAST, CLAY.MIN + PYRITE VERY DARK DUE TO
DISSEMINATED PYRITE*
Vesicles -
Size(mm): .5-2.5
Percent: 10
Location: THROUGHOUT
Filling: MOST EMPTY,
Shape: CIRCULAR
Filling: INCIPIENT SMEC
Filling: AT MARGINS
Leg : 81 Top/Bottom Interval(mm): 60/ 0 Describer: Morton, A.C.
Hole: 552 Top of Core Depth(m) : 279.00 Rock Type: IGNEOUS
Core: 21 Sample Midpoint(m) : 282.93 Sect/Pc #: CC/
ROCK = PLAG PHYRIC BASALT
EXTENSIVELY ALTERED;
Texture: PORPHYRITIC,VESICULAR;
Where sampled: FLOW INTERIOR (NEAR TOP)*
Phenocrysts- PLAGIOCLASE ( 20%)
Size(mm): 1.0-3.0 Morphology: LATHS
LABRADORITE,APPROX COMP AN59*
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): .1-.2 Morphology: LATHS
TOO SMALL TO DETERMINE APPROX COMP;
CLINOPYROXENE ( TR%)
Size(mm): .1 Morphology: ANHEDRAL
MOST ALTERED TO CLAY.MIN*
Alteration - CLAY MINERALS ( 45%)
Location: SOME IN Replacing: CPX + GROUNDMASS
Location: VESICLES,MOST
Location: IN GROUNDMASS
INCLUDES SMEC,DETERMINED BY XRD;
PYRITE ( 10%)
Location: GROUNDMASS Replacing: ILMENITE
ID UNCERTAIN FOR ILMENITE, REPLACEMENT IN PART
DISSEMINATED THROUGH CLAYS, VERY DARK*
Vesicles -
Size(mm): .5-4
Percent: 10
Location: THROUGHOUT
Filling: INCIPIENT SMEC
Shape: CIRCULAR
Filling: NEAR MARGINS
Filling: BUT MOST EMPTY
Leg : 81 Top/Bottom Interval(mm): 680/ 0 Describer: Morton, A.C.
Hole: 552 Top of Core Depth(m) : 284.00 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 284.68 Sect/Pc #: 1/PCE 6
ROCK = PLAG-CPX PHYRIC BASALT
EXTENSIVELY ALTERED;
Texture: PHYRIC,VESICULAR;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 30%)
Size(mm): .5-1.5 Morphology: LATHS
APPROX COMP AN57;
CLINOPYROXENE ( TR%)
Size(mm): .5 Morphology: ANHEDRAL
APPROX COMP AUGITE, OBVIOUS ALTERATION TO CLAY.MIN
REMNANT CPX IN CENTER OF CLAY MATRIX*
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): .10-.50 Morphology: LATHS
APPROX COMP AN57,CONTINUOUS WITH PHENO POPULATION*
Alteration - CLAY MINERALS ( 40%)
Location: VESICLES AND Replacing: GNDMASS + CPX
Location: GROUNDMASS
INCLUDES SMEC,DETERMINED THROUGH XRD;
PYRITE ( 5%)
Location: GNDMASS Replacing: ILMENITE
SKELETAL XTLS, ID UNCERTAIN FOR ILMENITE*
Vesicles -
Size(mm): 1-3.5
Percent: 15
Location: THROUGHOUT
Filling: XLN SMEC, SOME
Shape: CIRCULAR
Filling: PYRITE
COOLED,ALTERED MARGINS, PLAG LATHS PARALLEL TO
MARGINS*
Leg : 81 Top/Bottom Interval(mm): 20/ 0 Describer: Morton, A.C.
Hole: 552 Top of Core Depth(m) : 288.50 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 290.02 Sect/Pc #: 2/PCE 1
ROCK = APHYRIC BASALT
EXTENSIVELY ALTERED;
Texture: APHYRIC, VESICULAR;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): .1-1.5 Morphology: LATHS
LABRADORITE,APPROX COMP AN51;
CLINOPYROXENE ( 5%)
Size(mm): .5-1.0 Morphology: ANHEDRAL
ALTERED TO CLAY.MIN, NEVER ENCLOSES PLAG*
Alteration - CALCITE ( 5%)
Location: VEIN
FIBROUS;
CLAY MINERALS ( 30%)
Location: GNDMASS+VES. Replacing: GNDMASS + CPX
INCLUDES SMEC-DETERMINED THROUGH XRD;
PYRITE ( 5%)
Location: GNDMASS,RARE Replacing: ILMENITE
Location: IN VESICLES
SKELETAL XTLS, ID UNCERTAIN FOR ILMENITE*
Vesicles -
Size(mm): 1-3
Percent: 15
Location: THROUGHOUT
Filling: XLN SMEC, RARE
Shape: MOST
Filling: PYRITE
Shape: ROUND
COOLED MARGINS AROUND VESICLES FINER GRAINED, PLAG
LATHS OFTEN ARRANGED PARALLEL TO MARGIN*
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