Leg : 64 Top/Bottom Interval(mm): 20/ 0 Describer: Saunders, A.
Hole: 477 Top of Core Depth(m) : 48.50 Rock Type: IGNEOUS
Core: 7 Sample Midpoint(m) : 50.02 Sect/Pc #: 2/
ROCK = PLAG-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCHED;
Where sampled: OTHER
BASALTIC PEBBLE FRAGMENT IN SEDIMENT*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 0.5-1 Morphology: SUBHEDRAL-EUHEDRAL
FRESH,FREQUENTLY INTERGROWN INTO GLOMEROCRYSTIC
AGGREGATES (UP TO 3 MM ACROSS) WITH PLAG;
PLAGIOCLASE ( 10%)
Size(mm): TO 2 Morphology: LATH-SHAPED
FREQUENTLY INTERGROWN INTO GLOMEROCRYSTIC
AGGREGATES (UP TO 3 MM ACROSS) WITH OL*
Groundmass - OLIVINE ( 5%)
Size(mm): <0.1 Morphology: SKELETAL
IDENTIFICATION UNCERTAIN;
PLAGIOCLASE ( 30%)
Size(mm): TO 0.2 Morphology: SKELETAL
MICROLITES,EXHIBIT PILOTAXITIC ALIGNMENT;
COMBINATION ( 50%)
INCLUDES CPX + MAGN + MESOSTASIS,QUENCHED TEXTURE*
Alteration - COMBINATION ( 0%)
NO ALTERATION SEEN*
Vesicles -
Percent: 0
NONE SEEN*
Leg : 64 Top/Bottom Interval(mm): 130/ 0 Describer: Saunders, A.
Hole: 477 Top of Core Depth(m) : 60.00 Rock Type: IGNEOUS
Core: 9 Sample Midpoint(m) : 60.13 Sect/Pc #: 1/PCE 3
ROCK = PLAG PHYRIC DOLERITE;
Texture: SUBOPHITIC;
Where sampled: OTHER
INTERIOR OF ?SILL*
Phenocrysts- OLIVINE
SOME "GROUNDMASS" OL MAY BE MICROPHENOS;
PLAGIOCLASE ( 13.2%)
Size(mm): 1-5 Morphology: LATH-SHAPED,TABULAR
MANY STRONGLY ZONED;
CLINOPYROXENE
SOME CPX MAY BE PHENOS*
Groundmass - OLIVINE ( 6.4%)
Size(mm): 0.3-1.0 Morphology: ANHEDRAL,ROUNDED
MAY BE MICROPHENOS;
PLAGIOCLASE ( 44.3%)
Size(mm): TO 3 Morphology: VERY ELONGATE,LATH-SHAPED
CLINOPYROXENE ( 17.2%)
Size(mm): TO 4 Morphology: ANHEDRAL
APPROX COMP AUGITE,OPHITICALLY ENCLOSES PLAG IN
PLACES;
MAGNETITE ( 4.0%)
Size(mm): <0.5 Morphology: ANHEDRAL-EUHEDRAL
TITANOMAGNETITE,SOME TOOTHED FORMS,PERCENTAGES
OBTAINED BY POINT COUNT (750 POINTS)*
Alteration - CLAY MINERALS ( 10. %)
Location: INTERSTITIAL
Location: VOIDS
GREEN CLAY,NOT REPLACING ANYTHING*
Vesicles -
Size(mm): <0.5
Percent: 3.9
Location: INTERSTICES
Filling: EMPTY
Shape: IRREGULAR
Location: OF XTLS
?DIKTYTAXITIC CAVITIES,PROBABLY FILLED WITH CLAY
WHICH WAS LOST DURING SLIDE PREPARATION*
Leg : 64 Top/Bottom Interval(mm): 320/ 0 Describer: Saunders, A.
Hole: 477 Top of Core Depth(m) : 60.00 Rock Type: IGNEOUS
Core: 9 Sample Midpoint(m) : 60.32 Sect/Pc #: 1/PCE 6
ROCK = DOLERITE;
Texture: APHYRIC,SUBOPHITIC;
Where sampled: OTHER
INTERIOR OF ?SILL*
Groundmass - OLIVINE ( 3.1%)
Size(mm): 1-2 Morphology: SUBHEDRAL
INTERGROWN WITH FELDSPAR;
PLAGIOCLASE ( 50.4%)
Size(mm): 0.5-2 Morphology: LATH-SHAPED
CLINOPYROXENE ( 28.6%)
Size(mm): TO 2 Morphology: ANHEDRAL CLUSTERS
APPROX COMP AUGITE,SUBOPHITICALLY ENCLOSING PLAG;
MAGNETITE ( 7.3%)
Size(mm): 0.2-0.5 Morphology: ANHEDRAL-SUBHEDRAL,TOOTHED
PERCENTAGES OBTAINED BY POINT COUNT (765 POINTS)*
Alteration - CLAY MINERALS ( 6.5%)
Location: CAVITIES
GREEN COLOR;
ZEOLITE ( 0.3%)
Location: CAVITIES
?NATROLITE*
Vesicles -
Size(mm): 0.2-0.4
Percent: 3.7
Location: INTERSTITIAL
Filling: EMPTY
Shape: IRREGULAR
Location: TO XTLS
?DIKTYTAXITIC CAVITIES,CLAY.MIN FILLING REMOVED BY
SLIDE PREPARATION*
Leg : 64 Top/Bottom Interval(mm): 430/ 0 Describer: Saunders, A.
Hole: 477 Top of Core Depth(m) : 77.00 Rock Type: IGNEOUS
Core: 11 Sample Midpoint(m) : 77.43 Sect/Pc #: 1/PCE 8
ROCK = PLAG PHYRIC DOLERITE
OR GABBRO;
Texture: SUBOPHITIC,STRONGLY INEQUIGRANULAR,COARSE;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 29%)
Size(mm): TO 6 Morphology: LARGE,LATH-SHAPED,TABULAR
LARGE,SERIATE IN SIZE FROM GROUNDMASS,ZONED,
FREQUENTLY IN AGGREGATES*
Groundmass - OLIVINE ( 6.3%)
Size(mm): TO 2 Morphology: ANHEDRAL
MAY BE PHENOS;
PLAGIOCLASE ( 35.3%)
Size(mm): 0.5-2 Morphology: LATH-SHAPED
GRADES INTO PHENO SIZE;
CLINOPYROXENE ( 15.3%)
Size(mm): TO 6 Morphology: ANHEDRAL
APPROX COMP AUGITE,OPHITICALLY ENCLOSING PLAG;
MAGNETITE ( 3.6%)
Size(mm): <0.5 Morphology: ANHEDRAL-EUHEDRAL
APPROX COMP TITAN.MT,PERCENTAGES OBTAINED BY POINT
COUNT (665 POINTS)*
Alteration - COMBINATION ( 7.2%)
Location: INTERSTITIAL
INCLUDES CLAY.MIN + ZEOLITES,FOUND IN INTERSTITIAL
CAVITIES AND IN INTERSTICES BETWEEN XTALS,NO
APPARENT PARENT MINERAL*
Vesicles -
Size(mm): <0.5
Percent: 3.2
Location: INTERSTICES
Filling: EMPTY
Shape: IRREGULAR
?DIKTYTAXITIC CAVITIES,CLAY.MIN FILLING MAY HAVE
BEEN REMOVED BY SLIDE PREPARATION*
Leg : 64 Top/Bottom Interval(mm): 1100/ 0 Describer: Saunders, A.
Hole: 477 Top of Core Depth(m) : 86.50 Rock Type: IGNEOUS
Core: 12 Sample Midpoint(m) : 87.60 Sect/Pc #: 1/PCE 7
ROCK = PLAG MODERATELY PHYRIC DOLERITE
OR GABBRO;
Texture: SUBOPHITIC,COARSE;
Where sampled: OTHER
INTERIOR OF ?SILL*
Phenocrysts- OLIVINE
SOME "GROUNDMASS" OL MAY BE PHENOS (I.E.
PRE-ERUPTIVE?);
PLAGIOCLASE ( 7.7%)
Size(mm): TO 4 Morphology: TABULAR
FREQUENTLY BROKEN,SERIATE FROM GROUNDMASS PLAG*
Groundmass - OLIVINE ( 11.4%)
Size(mm): TO 1.5 Morphology: ANHEDRAL-SUBHEDRAL
MAY BE PRE-ERUPTIVE?;
PLAGIOCLASE ( 47.2%)
Size(mm): TO 2 Morphology: ELONGATE,LATH-SHAPED
CLINOPYROXENE ( 17.2%)
Size(mm): TO 5 Morphology: IRREGULAR
APPROX COMP AUGITE,OPHITICALLY ENCLOSES PLAG;
MAGNETITE ( 2.8%)
Size(mm): <0.5 Morphology: SUBHEDRAL-EUHEDRAL
APPROX COMP TITAN.MT,PERCENTAGES OBTAINED BY POINT
COUNT*
Alteration - COMBINATION ( 11.5%)
Location: INTERSTICES Replacing: OL
INCLUDES ZEOLITES + OTHER,MINOR OL ALTERATION BUT
MOSTLY FILLING CAVITIES*
Vesicles -
Size(mm): <0.5
Percent: 2.2
Location: INTERSTICES
Filling: EMPTY
Location: OF XTLS
DIKTYTAXITIC CAVITIES,NO FILLING UNLESS CLAY.MIN
HAVE BEEN REMOVED*
Leg : 64 Top/Bottom Interval(mm): 450/ 0 Describer: Fornari, D.
Hole: 477 Top of Core Depth(m) : 86.50 Rock Type: IGNEOUS
Core: 12 Sample Midpoint(m) : 92.95 Sect/Pc #: 5/PCE 1H
ROCK = PLAG PHYRIC BASALT;
Texture: PORPHYRITIC,SUBOPHITIC-INTERGRANULAR;
Where sampled: FLOW INTERIOR
SILL INTERIOR*
Phenocrysts- OLIVINE
Size(mm): 0.25-0.75 Morphology: ANHEDRAL-SUBHEDRAL
PLAGIOCLASE ( 26%)
Size(mm): 0.5-4 Morphology: LATHS
APPROX COMP AN49,SOME STRONG ZONING IN LARGER
LATHS,LATHS ARE OFTEN BROKEN;
CLINOPYROXENE
Size(mm): 0.2-0.7 Morphology: ANHEDRAL-SUBHEDRAL
Groundmass - OLIVINE ( 11%)
PLAGIOCLASE ( 27%)
CLINOPYROXENE ( 12%)
MAGNETITE ( 11%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - COMBINATION ( 13%)
Location: INTERGRAIN Replacing: OL,CPX
Location: BOUNDARIES
INCLUDES CLAY.MIN + ZEOLITES,IN INTERGRAIN
BOUNDARIES AND AFTER OL + CPX*
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 520/ 0 Describer: Fornari, D.
Hole: 477 Top of Core Depth(m) : 96.00 Rock Type: IGNEOUS
Core: 13 Sample Midpoint(m) : 96.52 Sect/Pc #: 1/PCE 3B
ROCK = PLAG PHYRIC DOLERITE;
Texture: SUBOPHITIC-INTERGRANULAR;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- OLIVINE
Morphology: ANHEDRAL-SUBHEDRAL
PLAGIOCLASE ( 20%)
Size(mm): 0.5-2 Morphology: LATHS,SUBHEDRAL
MOSTLY NORMALLY ZONED,APPROX COMP AN45;
CLINOPYROXENE
Morphology: ANHEDRAL-SUBHEDRAL
Groundmass - OLIVINE ( 14%)
Size(mm): 0.25-0.5
INCLUDES PHENO PHASE;
PLAGIOCLASE ( 31%)
Size(mm): 0.25
CLINOPYROXENE ( 13%)
Size(mm): 0.25-1
INCLUDES PHENO PHASE;
MAGNETITE ( 11%)
Size(mm): 0.05-0.2
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - CLAY MINERALS ( 11%)
Location: INTERGRAIN Replacing: OL,PYX
Location: BOUNDARIES
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 690/ 0 Describer: Fornari, D.
Hole: 477 Top of Core Depth(m) : 96.00 Rock Type: IGNEOUS
Core: 13 Sample Midpoint(m) : 98.19 Sect/Pc #: 2/PCE 6C
ROCK = PLAG-CPX-OL PHYRIC DOLERITE;
Texture: SUBOPHITIC-INTERGRANULAR;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- OLIVINE ( 15%)
Size(mm): 0.25-0.75 Morphology: ANHEDRAL-SUBHEDRAL
PLAGIOCLASE ( 15%)
Size(mm): 0.5-4 Morphology: LATHS
APPROX COMP AN50,MANY SHOW NORMAL ZONING;
CLINOPYROXENE ( 10%)
Size(mm): 0.5-1 Morphology: ANHEDRAL-SUBHEDRAL
Groundmass - OLIVINE ( 10%)
PLAGIOCLASE ( 30%)
MICROLITES;
CLINOPYROXENE ( 10%)
MAGNETITE ( 5%)
Morphology: SUBHEDRAL-EUHEDRAL
TI-RICH?,MANY SHOW WELL DEVELOPED CRUCIFORM HABIT*
Alteration - COMBINATION ( 5%)
Location: INTERGRAIN Replacing: OL,CPX
Location: SPACES
INCLUDES CLAY.MIN + ZEOLITES,PSEUDOMORPHS AFTER
OL + CPX*
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