Leg : 64 Top/Bottom Interval(mm): 480/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 222.00 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 222.48 Sect/Pc #: 1/PCE 6
ROCK = APHYRIC BASALT;
Texture: APHYRIC,INTERGRANULAR;
Where sampled: OTHER
SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 60%)
Size(mm): 1.5 Morphology: LATH-SHAPED
UP TO 1.5 MM LONG,APPROX COMP AN62-68,NORMALLY
ZONED,INTERSTITIAL;
CLINOPYROXENE ( 25%)
Size(mm): 0.1-0.5 Morphology: ANHEDRAL
APPROX COMP AUGITE?,VERY PALE BROWN,INTERGRANULAR;
MAGNETITE ( 3%)
Size(mm): 0.1-0.3 Morphology: CUBOID
ESPECIALLY IN ALTERATION AREAS;
ILMENITE ( 3%)
Size(mm): TO 0.5 Morphology: ELONGATE,TRELLIS PATTERN,
Morphology: SKELETAL
ESPECIALLY IN ALTERATION AREAS*
Alteration - CLAY MINERALS ( 10%)
Location: INTERSTITIAL Replacing: MESOSTASIS,OL
INTERSTITIAL AND AS ANHEDRAL PSEUDOMORPHS,
REPLACING MESOSTASIS? AND POSSIBLY OL,GREEN CLAY?*
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 450/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 231.50 Rock Type: IGNEOUS
Core: 27 Sample Midpoint(m) : 231.95 Sect/Pc #: 1/PCE 4A
ROCK = APHYRIC BASALT
ALTERED;
Texture: APHYRIC,INTERSERTAL,VESICULAR;
Where sampled: OTHER
SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.2-0.8 Morphology: LATHS,SKELETAL
SKELETAL MICROLITES,INTERSTITIAL;
CLINOPYROXENE ( 10%)
Size(mm): <0.1 Morphology: ANHEDRAL
SOME MAY BE OL (TOO SMALL TO BE SURE);
MAGNETITE ( 3%)
Size(mm): 0.01-0.1 Morphology: CUBOID,EUHEDRAL
ILMENITE ( 3%)
Size(mm): TO 0.1 Morphology: ELONGATE,TRELLIS
Alteration - CLAY MINERALS ( 40%)
Location: THROUGHOUT Replacing: MESOSTASIS,OL
REPLACING MESOSTASIS? AND POSSIBLY OL*
Vesicles -
Size(mm): 1-1.5
Percent: <3
Location: RANDOM
Shape: SPHERICAL
FILLING IS NOT-PRESERVED*
Leg : 64 Top/Bottom Interval(mm): 820/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 231.50 Rock Type: IGNEOUS
Core: 27 Sample Midpoint(m) : 232.32 Sect/Pc #: 1/PCE 7
ROCK = APHYRIC BASALT;
Texture: APHYRIC,INTERGRANULAR;
Where sampled: OTHER
SILL INTERIOR*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): <0.5 Morphology: LATH-SHAPED
INTERSTITIAL,APPROX AN50?;
CLINOPYROXENE ( 10%)
Size(mm): <0.1 Morphology: ANHEDRAL
INTERGRANULAR,SOME MAY BE OL (TOO SMALL TO SEE);
OPAQUE MINERALS ( 5%)
Size(mm): <0.2 Morphology: SUBHEDRAL-EUHEDRAL
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE ( 1%)
Location: VESICLES
PERCENTAGE QUESTIONABLE,POSSIBLY MORE IN
GROUNDMASS;
CLAY MINERALS ( 35%)
Location: INTERSTITIAL Replacing: MESOSTASIS,OL
REPLACING OL IS QUESTIONABLE,IRON-RICH,GREEN IN
COLOR*
Vesicles -
Size(mm): TO 10
Percent: 3
Location: RANDOM
Filling: MESOSTASIS,
Shape: OVOID
Filling: VESICLES,PLAG
"COMPOUND" VESICLES (TO 10 MM) WITH SMALLER (0.5-
1.0 MM) EMPTY VESICLES INSIDE,FILLING CONSISTS OF
COARSE-GRAINED IRON-RICH MESOSTASIS + PLAG +
VESICLES;
Size(mm): 0.3
Percent: <1
Location: RANDOM
Filling: CLAY.MIN,
Shape: SPHERICAL
Filling: CALCITE
"ORDINARY" VESICLES*
Leg : 64 Top/Bottom Interval(mm): 500/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 336.00 Rock Type: IGNEOUS
Core: 40 Sample Midpoint(m) : 339.50 Sect/Pc #: 3/PCE 1B
ROCK = PLAG SPARSELY PHYRIC DOLERITE;
Texture: SPARSELY PORPHYRITIC,SUBOPHITIC-INTERGRANULAR;
OTHER
SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1-2%)
Size(mm): 2 Morphology: EQUANT-TABULAR
ZONED,RARE;
CLINOPYROXENE
LARGE PYX'S MAY BE PHENOS OR GROUNDMASS PHASES*
Groundmass - OLIVINE ( 0%)
NONE SEEN;
PLAGIOCLASE ( 40%)
Size(mm): 0.5-1.5 Morphology: LATH-SHAPED
PLAG OCCURS AS OPHITIC INCLUSIONS IN PYX AND AS
XTLS BETWEEN PYX XTLS;
CLINOPYROXENE ( 35%)
Size(mm): TO 4 Morphology: ANHEDRAL
APPROX COMP AUGITE? (PALE BROWN),TWO TYPES PRESENT
1)LARGE (PHENOS?) IRREGULAR XTLS ENCLOSING PLAG
AND 2)SMALLER INTERGRANULAR XTLS;
OPAQUE MINERALS ( 5%)
Size(mm): 0.2 Morphology: CUBOID,ELONGATE
INCLUDES MAGN + ILMENITE,MAGN IS CUBOID AND
ILMENITE IS ELONGATE*
Alteration - COMBINATION ( 15%)
Location: INTERSTICES Replacing: MESOSTASIS,OL,FEL
INCLUDES CLAY.MIN + ZEOLITES,REPLACES MESOSTASIS?
AND POSSIBLY OL?,MINOR ALTERATION OF FELDSPARS*
Vesicles -
Size(mm): 1
Percent: 3
Location: INTERGRANULAR
Filling: CLAY.MIN,
Shape: SPHERICAL
Filling: ZEOLITES
ZEOLITE FILLING IS QUESTIONABLE,CLAY IS GREEN*
Leg : 64 Top/Bottom Interval(mm): 820/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 345.50 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 346.32 Sect/Pc #: 1/PCE 3
ROCK = DOLERITE;
Texture: APHYRIC,SUBOPHITIC-INTERGRANULAR;
Where sampled: OTHER
SILL INTERIOR,ZONE OF APPARENT FELDSPAR
ACCUMULATION*
Phenocrysts- CLINOPYROXENE
SOME CPX MAY BE PHENOS*
Groundmass - OLIVINE ( <5%)
Size(mm): 0.3-0.8 Morphology: ANHEDRAL
PLAGIOCLASE ( 30%)
Size(mm): TO 2 Morphology: ELONGATE,LATH-SHAPED
ABOUT ONE-FOURTH ARE ENCLOSED IN CPX XTLS,STRONGLY
ZONED;
CLINOPYROXENE ( 25%)
Size(mm): TO 3 Morphology: IRREGULAR,AGGREGATES
APPROX COMP AUGITE,OPTICALLY CONTINUOUS AGGREGATES
AND IRREGULAR XTLS;
OPAQUE MINERAL ( 3%)
Size(mm): <0.3 Morphology: IRREGULAR,ANHEDRAL
INCLUDES MAGN + ILMENITE;
PYRITES ( 2%)
Morphology: AGGREGATES
IDENTITY UNCERTAIN,AGGREGATES IN VEINS*
Alteration - COMBINATION ( 35%)
Location: INTERSTICES Replacing: MESOSTASIS,OL,CPX,PLAG
INCLUDES GREEN FIBROUS CLAY.MIN AND ZEOLITES?,
REPLACING MESOSTASIS? (A LOT OF WHICH APPEARS TO
HAVE BEEN LOST IN THIN SECTION PREPARATION) + OL +
SOME CPX + SOME PLAG*
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 800/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 345.50 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 350.80 Sect/Pc #: 4/PCE 1D
ROCK = DOLERITE;
Texture: APHYRIC,OPHITIC,INTERGRANULAR
OPHITIC (PLAG IN PYX) WITH ALTERED INTERGRANULAR
ZONES;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- CLINOPYROXENE
LARGE ANHEDRAL PYX XTLS MAY BE PHENOS*
Groundmass - OLIVINE ( <5%)
Size(mm): 0.5 Morphology: ANHEDRAL
PLAGIOCLASE ( 30%)
Size(mm): 0.5-3 Morphology: LATH-SHAPED
APPROX COMP AN54 (1 DETERMINED BY THE MICHAEL-LEVY
METHOD),OPHITICALLY ENCLOSED BY CPX AND
INTERSTITIAL TO CPX;
CLINOPYROXENE ( 40%)
Size(mm): 1-4 Morphology: ANHEDRAL
APPROX COMP AUGITE?,LARGE XTLS AND SMALLER MORE
INTERSTITIAL GRAINS;
OPAQUE MINERALS ( 5%)
Size(mm): 0.2-0.4 Morphology: ANHEDRAL,ELONGATE
INCLUDE MAGN + ILMENITE,DISSEMINATED,SOME ELONGATE
GRAINS OF ILMENITE*
Alteration - COMBINATION ( 20%)
Location: INTERSTITIAL Replacing: MESOSTASIS,PYX,OL,PLAG
INCLUDES GREEN CLAY.MIN + ZEOLITES,INTERSTITIAL TO
LARGE PYX XTLS,REPLACING MESOSTASIS + RIMMING PYX
+ RIMMING OL + SLIGHT ALTERATION OF INTERGRANULAR
PLAG*
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 600/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 345.50 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 353.60 Sect/Pc #: 6/PCE 1E
ROCK = DOLERITE;
Texture: APHYRIC,SUBOPHITIC,GLOMEROPORPHYRITIC
GLOMEROPORPHYRITIC IS QUESTIONABLE,THE TEXTURE IN
THIS ROCK IS UNUSUAL. THE PYX AND PLAG XTLS ARE
INTERGROWN TO FORM SUBOPHITIC AND GLOMEROPHYRIC
MASSES (APPROX 3-5 MM ACROSS) ENCLOSED IN A VERY
FINE GRAINED AND VERY ALTERED MESOSTASIS OR
QUENCHED BASALT. THIS SUGGESTS THAT CPX + OL +
PLAG ARE MAINLY PHENOS;
Where sampled: OTHER
SILL INTERIOR*
Groundmass - OLIVINE ( 3%)
Size(mm): 0.5-1.0 Morphology: ANHEDRAL
ADJACENT TO OR ENCLOSED BY CPX;
PLAGIOCLASE ( 20%)
Size(mm): TO 3 Morphology: LATH-SHAPED
INTERGROWN WITH CPX AND INTERGRANULAR TO CPX;
CLINOPYROXENE ( 20%)
Size(mm): TO 4
APPROX COMP AUGITE,LARGE SEMI-CONTINUOUS XTLS;
MAGNETITE ( 3%)
Size(mm): TO 1.0 Morphology: SKELETAL,CUBOID
APPROX COMP TITANOMAGNETITE*
Alteration - COMBINATION ( 50%)
Location: INTERSTITIAL Replacing: MESOSTASIS
INCLUDES CLAY.MIN + ZEOLITES,INTERSTITIAL TO PYX
+ PLAG GLOMEROCRYSTS,PROBABLY REPLACING A FINE
GRAINED BASALT OR A MESOSTASIS,MOSTLY LOST DURING
THIN SECTION PREPARATION*
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 850/ 0 Describer: Fornari, D.
Hole: 478 Top of Core Depth(m) : 355.00 Rock Type: IGNEOUS
Core: 42 Sample Midpoint(m) : 357.35 Sect/Pc #: 2/PCE 1F
ROCK = DOLERITE;
Texture: PORPHYRITIC,OPHITIC;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- OLIVINE ( 0%)
NONE SEEN;
PLAGIOCLASE ( 20%)
Size(mm): 1 Morphology: LATHS
APPROX COMP AN40,OPHITICALLY ENCLOSED IN CPX;
CLINOPYROXENE ( 20%)
Size(mm): 1-4 Morphology: ANHEDRAL-SUBHEDRAL
APPROX COMP AUGITE,IRREGULARLY FRACTURED*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 25%)
Size(mm): <1 Morphology: LATHS
SMALL LATHS;
CLINOPYROXENE ( 5%)
Size(mm): <1 Morphology: ANHEDRAL
APPROX COMP AUGITE;
OPAQUE MINERALS ( 10%)
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE ( 0%)
COMBINATION ( 20%)
Replacing: PLAG
INCLUDES CLAY.MIN + ZEOLITES,FOUND IN AREAS OF
APHANITIC TEXTURE (QUENCHED?),REPLACING PLAG
MICROLITES*
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 1160/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 355.00 Rock Type: IGNEOUS
Core: 42 Sample Midpoint(m) : 357.66 Sect/Pc #: 2/PCE 1G
ROCK = GABBRO;
Texture: GABBROIC (CUMULATE),OPHITIC,GRAPHIC,INTERSERTAL
THE TEXTURE OF THIS ROCK IS UNUSUAL BUT SIMILAR TO
41-6-60. HOWEVER THE INTERSTITIAL MESOSTASIS IS
BETTER PRESERVED AND SEVERAL OF THE FRAGMENTS ARE
GABBROIC. ONE FRAGMENT (APPROX 12 MM LONG)
COMPRISES CUMULATE PLAG WHILE ANOTHER SHOWS A
GRAPHIC INTERGROWTH OF PLAG IN PYX;
Where sampled: OTHER
SILL INTERIOR,GABBROIC INCLUSION AND ALTERED ZONE*
Groundmass - OLIVINE ( 5%)
Size(mm): 0.5-1.0 Morphology: ANHEDRAL
ASSOCIATED WITH CPX/PLAG CLUSTERS;
PLAGIOCLASE ( 30%)
Size(mm): TO 5 Morphology: LATH-SHAPED,EQUANT,AGGREGATES
OCCURS IN AGGREGATES WITH CPX,SUBOPHITIC AND
GRAPHIC INTERGROWTHS WITH CPX,ONE CLUSTER OF PLAG
IS DEFINITELY PART OF A CUMULATE GABBRO WHICH
CONTAINS OL,APPROX COMP AN50-70;
CLINOPYROXENE ( 40%)
Size(mm): 1-6 Morphology: IRREGULAR
IRREGULAR XTLS AND INTERSTITIAL TO PLAG,APPROX
COMP AUGITE;
MAGNETITE ( 3%)
Size(mm): <0.5
MICROCRYST GROUNDMASS ( 10%)
INCLUDES PLAG + CPX + FE.MINS + MESOSTASIS,VERY
FINE GRAINED MESOSTASIS COMPRISING PLAG MICROLITES
+ IRON ORE + POSSIBLY CPX (NOW COMPLETELY
ALTERED),SURROUNDS GABBROIC-DOLERITIC FRAGMENTS*
Alteration - CLAY MINERALS ( 10%)
Location: INTERSTICES Replacing: MESOSTASIS
MAINLY IN THE INTERSTICES REPLACING MESOSTASIS;
ZEOLITE ( 15%)
Location: INTERSTICES Replacing: MESOSTASIS,FEL
MAINLY IN THE INTERSTICES REPLACING MESOSTASIS,THE
ZEOLITES FORM RADIATING CLUSTERS IN 1-2 MM
CAVITIES*
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 930/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 355.00 Rock Type: IGNEOUS
Core: 42 Sample Midpoint(m) : 358.93 Sect/Pc #: 3/PCE 3B
ROCK = DOLERITE
VERY ALTERED;
Texture: SUBOPHITIC,INTERGRANULAR;
Where sampled: OTHER
SILL INTERIOR,CLOSE TO VEIN*
Phenocrysts- PLAGIOCLASE
LARGE (UP TO 5 MM) CPX AND PLAG INTERGROWTHS MAY
BE PHENOCRYSTIC BUT ARE LISTED IN THE GROUNDMASS;
CLINOPYROXENE
LARGE (UP TO 5 MM) CPX AND PLAG INTERGROWTHS MAY
BE PHENOCRYSTIC BUT ARE LISTED IN THE GROUNDMASS*
Groundmass - OLIVINE ( 0%)
NONE SEEN;
PLAGIOCLASE ( 40%)
Size(mm): 0.5-2.5 Morphology: LATH-SHAPED
APPROX COMP AN60-65;
CLINOPYROXENE ( 20%)
Size(mm): TO 4 Morphology: IRREGULAR
APPROX COMP AUGITE,IRREGULAR ISOLATED XTLS
SUBOPHITICALLY ENCLOSING PLAG LATHS,ALSO
INTERGRANULAR;
MAGNETITE ( 1%)
Size(mm): TO 0.5 Morphology: ANHEDRAL
ILMENITE ( 1%)
Size(mm): TO 0.5 Morphology: ELONGATE
Alteration - COMBINATION ( 35%)
Location: INTERSTICES Replacing: MESOSTASIS,OL
INCLUDES CLAY.MIN + ZEOLITES,FOUND IN INTERSTICES
BETWEEN LARGE CPX/PLAG INTERGROWTHS,REPLACING
MESOSTASIS AND POSSIBLY OL*
Leg : 64 Top/Bottom Interval(mm): 990/ 0 Describer: Fornari, D.
Hole: 478 Top of Core Depth(m) : 364.50 Rock Type: IGNEOUS
Core: 43 Sample Midpoint(m) : 365.49 Sect/Pc #: 1/PCE 1G
ROCK = DOLERITE TO GABBRO
COARSE DOLERITE TO MICROGABBRO;
Texture: PORPHYRITIC,OPHITIC;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 0.75-1 Morphology: ANHEDRAL-SUBHEDRAL
PLAGIOCLASE ( 20%)
Size(mm): 0.75-1.5 Morphology: LATHS
APPROX COMP AN55,SOME ZONED NORMALLY;
CLINOPYROXENE ( 15%)
Size(mm): 1.5-3 Morphology: ANHEDRAL-SUBHEDRAL
APPROX COMP AUGITE,FRACTURED,OPHITICALLY ENCLOSING
PLAG*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 30%)
Size(mm): 0.3-0.75 Morphology: LATHS
SMALL LATHS;
CLINOPYROXENE ( 5%)
Size(mm): 0.1-1 Morphology: ANHEDRAL
APPROX COMP AUGITE;
OPAQUE MINERALS ( 10%)
INCLUDES MAGN + ILMENITE*
Alteration - COMBINATION ( 15%)
Location: INTERGRAIN Replacing: CPX
Location: BOUNDARIES
INCLUDES CLAY.MIN + ZEOLITES,FOUND IN INTERGRAIN
BOUNDARIES AND AFTER CPX,BROWNISH GREEN COLOR*
Leg : 64 Top/Bottom Interval(mm): 700/ 0 Describer: Fornari, D.
Hole: 478 Top of Core Depth(m) : 364.50 Rock Type: IGNEOUS
Core: 43 Sample Midpoint(m) : 366.70 Sect/Pc #: 2/PCE 1C
ROCK = DOLERITE
ALTERED;
Texture: PORPHYRITIC,SUBOPHITIC;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- OLIVINE ( 7%)
Size(mm): 0.5-1 Morphology: ANHEDRAL
CORRODED;
PLAGIOCLASE ( 15%)
Size(mm): 1-3 Morphology: TABULAR LATHS,FEATHERED EDGES
STRONG ZONING;
CLINOPYROXENE ( 10%)
Size(mm): 0.5-1 Morphology: ANHEDRAL
APPROX COMP AUGITE,FRACTURED ALONG CLEAVAGE AND
CORRODED*
Groundmass - OLIVINE ( 10%)
Size(mm): 0.1-0.5
PLAGIOCLASE ( 20%)
Size(mm): 0.5-1
CLINOPYROXENE ( 20%)
Size(mm): 0.1-0.5
MAGNETITE ( 3%)
Size(mm): 0.1-0.3 Morphology: ANHEDRAL
Alteration - CARBONATE ( 5%)
Location: VEINLETS
COMBINATION ( 10%)
Location: INTERGRAIN Replacing: GROUNDMASS,CPX,OL
Location: BOUNDARIES
INCLUDES CLAY.MIN + ZEOLITES,REPLACING OL IS
QUESTIONABLE*
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 680/ 0 Describer: Fornari, D.
Hole: 478 Top of Core Depth(m) : 364.50 Rock Type: IGNEOUS
Core: 43 Sample Midpoint(m) : 369.68 Sect/Pc #: 4/PCE 2D
ROCK = DOLERITE;
Texture: PORPHYRITIC,SUBOPHITIC
WAS OPHITIC BEFORE BREAKAGE OF CPX?;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- OLIVINE ( 0%)
PLAGIOCLASE ( 15%)
Size(mm): 1-2 Morphology: LATHS
STRONG ZONING (SOME REVERSE);
CLINOPYROXENE ( 0%)
Groundmass - OLIVINE ( 10%)
Size(mm): 0.1-0.5 Morphology: ANHEDRAL
PLAGIOCLASE ( 25%)
Size(mm): 0.1-1 Morphology: LATHS
SMALL LATHS;
CLINOPYROXENE ( 30%)
Size(mm): 0.1-0.5 Morphology: ANHEDRAL,GRANULAR AGGREGATES
APPROX COMP AUGITE,EXTENSIVELY FRACTURED;
MAGNETITE ( 5%)
Size(mm): 0.1-0.3 Morphology: ANHEDRAL
DISSEMINATED*
Alteration - CARBONATE ( 5%)
Location: VEINLETS
FILLING VEINLETS;
COMBINATION ( 10%)
Location: INTERGRAIN Replacing: CPX,OL
Location: BOUNDARIES
INCLUDES CLAY.MIN + ZEOLITES*
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 250/ 0 Describer: Fornari, D.
Hole: 478 Top of Core Depth(m) : 374.00 Rock Type: IGNEOUS
Core: 44 Sample Midpoint(m) : 374.25 Sect/Pc #: 1/PCE 1C
ROCK = DOLERITE TO GABBRO
MICROGABBRO TO COARSE DOLERITE;
Texture: PORPHYRITIC,OPHITIC
CPX ENCLOSING PLAG (AT TIMES SUBOPHITIC);
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- OLIVINE ( 0%)
NONE SEEN;
PLAGIOCLASE ( 30%)
Size(mm): 1-1.5 Morphology: TABULAR LATHS
APPROX COMP AN40,OPHITICALLY ENCLOSED IN CPX +
SOME SUBOPHITIC PLAG AROUND SMALLER CPX;
CLINOPYROXENE ( 20%)
Size(mm): 1-3 Morphology: SUBHEDRAL-ANHEDRAL
APPROX COMP AUGITE,AT TIMES FRACTURED BUT VERY
FRESH*
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): 0.1-1 Morphology: LATHS
SMALL LATHS;
CLINOPYROXENE ( 15%)
Size(mm): 0.1-1 Morphology: ANHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 5%)
Alteration - COMBINATION ( 20%)
Location: INTERGRAIN Replacing: CPX PHENOS,CPX
Location: BOUNDARIES
INCLUDES CLAY.MIN + ZEOLITES,REPLACING BOTH CPX
PHENOS AND GROUNDMASS CPX*
Leg : 64 Top/Bottom Interval(mm): 580/ 0 Describer: Fornari, D.
Hole: 478 Top of Core Depth(m) : 374.00 Rock Type: IGNEOUS
Core: 44 Sample Midpoint(m) : 382.08 Sect/Pc #: 6/PCE 1B
ROCK = DOLERITE
ALTERED;
Texture: PORPHYRITIC,OPHITIC-SUBOPHITIC;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- OLIVINE ( 0%)
PLAGIOCLASE ( 20%)
Size(mm): 1-1.5 Morphology: TABULAR LATHS
APPROX COMP AN60,MOST SHOW NORMAL ZONING;
CLINOPYROXENE ( 10%)
Size(mm): 1-4 Morphology: SUBHEDRAL-ANHEDRAL
APPROX COMP AUGITE*
Groundmass - OLIVINE ( 0%)
NONE SEEN;
PLAGIOCLASE ( 25%)
Size(mm): 0.1-0.5
CLINOPYROXENE ( 10%)
Size(mm): 0.1-0.5
OPAQUE MINERALS ( 5%)
Size(mm): 0.1-0.3 Morphology: SUBHEDRAL-ANHEDRAL
INCLUDES MAGN + ILMENITE*
Alteration - CLAY MINERALS ( 15%)
Location: INTERGRAIN Replacing: CPX
Location: BOUNDARIES
AFTER CPX;
ZEOLITE ( 15%)
Location: INTERGRAIN
Location: BOUNDARIES
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 160/ 0 Describer: Fornari, D.
Hole: 478 Top of Core Depth(m) : 383.00 Rock Type: IGNEOUS
Core: 45 Sample Midpoint(m) : 389.16 Sect/Pc #: 5/PCE 1A
ROCK = CPX PHYRIC DOLERITE
WEATHERED;
Texture: PORPHYRITIC,POIKILITIC-OPHITIC;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- CLINOPYROXENE ( 15%)
Size(mm): 0.5-5 Morphology: ANHEDRAL
APPROX COMP AUGITE*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.5-1.5 Morphology: LATHS
APPROX COMP AN50,SMALL LATHS ENCLOSED PARTLY OR
TOTALLY WITHIN LARGE CPX,ZONED;
OPAQUE MINERALS ( 5%)
Size(mm): 0.1-0.5
INCLUDES MAGN + ILMENITE*
Alteration - CLAY MINERALS ( 25%)
Location: INTERGRAIN Replacing: CPX
Location: BOUNDARIES
BROWNISH GREEN;
ZEOLITE ( 15%)
Location: INTERGRAIN
Location: BOUNDARIES
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 1080/ 0 Describer: Fornari, D.
Hole: 478 Top of Core Depth(m) : 383.00 Rock Type: IGNEOUS
Core: 45 Sample Midpoint(m) : 390.08 Sect/Pc #: 5/PCE 1F
ROCK = PLAG-CPX PHYRIC DOLERITE;
Texture: PORPHYRITIC,OPHITIC;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- OLIVINE ( 0%)
NONE SEEN;
PLAGIOCLASE ( 20%)
Size(mm): 0.5-1.5 Morphology: LATHS
APPROX COMP AN45,WITHIN AND PROTRUDING FROM CPX;
CLINOPYROXENE ( 15%)
Size(mm): 1-5 Morphology: SUBHEDRAL-ANHEDRAL
APPROX COMP AUGITE,CORRODED,APPEARS TO PARTIALLY
ENCLOSE PLAG + OPHITICALLY ENCLOSE PLAG*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 30%)
Size(mm): >0.5
CLINOPYROXENE ( 10%)
Size(mm): 0.5-1 Morphology: ANHEDRAL GRAINS
APPROX COMP AUGITE,CORRODED AND ISOLATED FROM
MOST PHENOS;
OPAQUE MINERALS ( <5%)
Size(mm): 0.2 Morphology: ANHEDRAL
INCLUDES MAGN + ILMENITE,DISSEMINATED*
Alteration - CLAY MINERALS ( 10%)
Location: INTERGRAIN Replacing: CPX PHENOS
Location: BOUNDARIES
ZEOLITE ( 10%)
Location: INTERGRAIN
Location: BOUNDARIES
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 180/ 0 Describer: Fornari, D.
Hole: 478 Top of Core Depth(m) : 392.00 Rock Type: IGNEOUS
Core: 46 Sample Midpoint(m) : 392.18 Sect/Pc #: 1/PCE 1D
ROCK = PLAG-CPX PHYRIC DOLERITE TO GABBRO
COARSE DOLERITE TO MICROGABBRO;
Texture: PORPHYRITIC,OPHITIC;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- OLIVINE ( 0%)
NONE SEEN;
PLAGIOCLASE ( 40%)
Size(mm): 1-2.5 Morphology: TABULAR LATHS
APPROX COMP AN44,SOME NORMAL ZONING;
CLINOPYROXENE ( 20%)
Size(mm): 2-5 Morphology: SUBHEDRAL
APPROX COMP AUGITE,MOSTLY VERY FRESH*
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): 0.5-1 Morphology: LATHS
SMALL LATHS;
CLINOPYROXENE ( 5%)
Size(mm): <2 Morphology: ANHEDRAL
APPROX COMP AUGITE,PROBABLY FRAGMENTS OF LARGER
CPX;
OPAQUE MINERALS ( 5%)
Size(mm): 0.25-0.75 Morphology: EUHEDRAL-SUBHEDRAL
INCLUDES MAGN + ILMENITE,LARGE EUHEDRAL-SUBHEDRAL,
DISSEMINATED*
Alteration - CARBONATE ( 0%)
CLAY MINERALS ( 10%)
Location: INTERGRAIN Replacing: CPX
Location: BOUNDARIES
AFTER SOME CPX;
ZEOLITE ( 5%)
Location: INTERGRAIN
Location: BOUNDARIES
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 750/ 0 Describer: Fornari, D.
Hole: 478 Top of Core Depth(m) : 392.00 Rock Type: IGNEOUS
Core: 46 Sample Midpoint(m) : 397.25 Sect/Pc #: 4/PCE 1C
ROCK = PLAG-CPX PHYRIC DOLERITE;
Texture: PORPHYRITIC,OPHITIC,INTERGRANULAR;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 30%)
Size(mm): 0.5-1.5 Morphology: TABULAR LATHS
APPROX COMP AN50,MINOR NORMAL ZONING;
CLINOPYROXENE ( 20%)
Size(mm): 0.5-4 Morphology: ANHEDRAL
APPROX COMP AUGITE,PHENOCRYST FRAGMENTS*
Groundmass - OLIVINE ( 5%)
Size(mm): <0.5 Morphology: ANHEDRAL
PLAGIOCLASE ( 30%)
Size(mm): 0.1-0.5 Morphology: LATHS
SMALL LATHS,INTERGRANULAR;
OPAQUE MINERALS ( <5%)
Size(mm): 0.1-0.25 Morphology: SUBHEDRAL-ANHEDRAL
INCLUDES MAGN + ILMENITE,DISPERSED*
Alteration - COMBINATION ( 10%)
Location: INTERGRAIN Replacing: CPX
Location: BOUNDARIES
INCLUDES CLAY.MIN + ZEOLITES*
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 100/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 412.00 Rock Type: IGNEOUS
Core: 49 Sample Midpoint(m) : 415.10 Sect/Pc #: 3/PCE 1B
ROCK = DOLERITE;
Texture: SUBOPHITIC-OPHITIC,INTERGRANULAR;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- PLAGIOCLASE
LARGE CPX + PLAG INTERGROWTHS MAY BE PHENOS BUT
THEY ARE LISTED IN THE GROUNDMASS FIGURES;
CLINOPYROXENE
LARGE CPX + PLAG INTERGROWTHS MAY BE PHENOS BUT
THEY ARE LISTED IN THE GROUNDMASS FIGURES*
Groundmass - OLIVINE ( 5%)
Size(mm): 0.4-1.0 Morphology: ANHEDRAL
SURROUNDED BY CLAY.MIN;
PLAGIOCLASE ( 45%)
Size(mm): 0.4-1.5 Morphology: LATH-SHAPED
OCCURS IN PYX AND SEPARATELY;
CLINOPYROXENE ( 45%)
Size(mm): TO 4 Morphology: IRREGULAR
APPROX COMP AUGITE,LARGE OPHITICALLY CONTINUOUS
AGGREGATES AND SMALLER INTERGRANULAR XTLS;
OPAQUE MINERALS ( 2%)
Size(mm): TO 1 Morphology: SKELETAL
INCLUDES MAGN + ILMENITE,SKELETAL AND FRAGMENTED*
Alteration - CLAY MINERALS ( 5%)
Location: INTERSTITIAL Replacing: MESOSTASIS,OL,MICAS
REPLACING MESOSTASIS AND MICAS IS QUESTIONABLE*
Leg : 64 Top/Bottom Interval(mm): 550/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 419.00 Rock Type: IGNEOUS
Core: 50 Sample Midpoint(m) : 425.55 Sect/Pc #: 5/PCE 1D
ROCK = DOLERITE;
Texture: OPHITIC-POIKILITIC,INTERGRANULAR;
Where sampled: OTHER
SILL INTERIOR*
Groundmass - OLIVINE ( 5%)
Size(mm): 0.3-1.0 Morphology: ANHEDRAL
SOME ENCLOSED IN CPX;
PLAGIOCLASE ( 50%)
Size(mm): 0.3-2.0 Morphology: LATH-SHAPED,TABULAR
APPROX COMP AN55-60;
CLINOPYROXENE ( 40%)
Size(mm): 0.3-5.0 Morphology: ANHEDRAL
LARGE ANHEDRAL XTLS ENCLOSING PLAG + RARE OL AND
ALSO SMALLER INTERGRANULAR XTLS;
OPAQUE MINERALS ( 1%)
Size(mm): 0.1-0.3 Morphology: IRREGULAR
INCLUDES MAGN + ILMENITE*
Alteration - CLAY MINERALS ( 5%)
Location: INTERSTITIAL Replacing: MESOSTASIS,OL
Leg : 64 Top/Bottom Interval(mm): 480/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 428.00 Rock Type: IGNEOUS
Core: 51 Sample Midpoint(m) : 431.48 Sect/Pc #: 3/PCE 1D
ROCK = GABBRO;
Texture: OPHITIC
WITH 10% MESOSTASIS;
Where sampled: OTHER
XENOLITH IN DOLERITE SILL*
Groundmass - OLIVINE ( 5%)
Size(mm): 1-2 Morphology: ROUNDED,ANHEDRAL
PARTLY ALTERED;
PLAGIOCLASE ( 30%)
Size(mm): 0.5-3 Morphology: LATH-SHAPED
ENCLOSED IN PLAG;
CLINOPYROXENE ( 55%)
Size(mm): 1-10 Morphology: ANHEDRAL
APPROX COMP AUGITE,OPHITICALLY ENCLOSES PLAG;
ILMENITE ( 3%)
Size(mm): 0.5-1.0 Morphology: ELONGATE
POSSIBLY TITAN.MT*
Alteration - CLAY MINERALS ( 5%)
Location: INTERSTICES Replacing: MESOSTASIS,OL
ZEOLITE ( 5%)
Location: INTERSTICES Replacing: MESOSTASIS,FEL
RARELY REPLACING FEL*
Leg : 64 Top/Bottom Interval(mm): 1110/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 428.00 Rock Type: IGNEOUS
Core: 51 Sample Midpoint(m) : 432.11 Sect/Pc #: 3/PCE 1I
ROCK = DOLERITE;
Texture: OPHITIC-INTERGRANULAR;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- PLAGIOCLASE
LARGE CPX/PLAG INTERGROWTHS MAY BE PHENOS BUT ARE
INCLUDED IN THE GROUNDMASS FIGURES;
CLINOPYROXENE
LARGE CPX/PLAG INTERGROWTHS MAY BE PHENOS BUT ARE
INCLUDED IN THE GROUNDMASS FIGURES*
Groundmass - OLIVINE ( 10%)
Size(mm): 0.5-1.0 Morphology: ROUNDED,ANHEDRAL
OCCASIONALLY ENCLOSED IN CPX;
PLAGIOCLASE ( 50%)
Size(mm): 0.5-1.5 Morphology: LATH-SHAPED
OCCASIONALLY ENCLOSED IN CPX;
CLINOPYROXENE ( 30%)
Size(mm): 1-6
APPROX COMP AUGITE?;LARGE XTLS WITH OPHITIC PLAG
AND SMALLER INTERGRANULAR XTLS;
MAGNETITE ( 5%)
Size(mm): TO 1 Morphology: SKELETAL
APPROX COMP TITAN.MT?,RESORBED XTLS*
Alteration - CLAY MINERALS ( 5%)
Location: INTERSTICES Replacing: MESOSTASIS,OL
REPLACING MESOSTASIS IS QUESTIONABLE*
Leg : 64 Top/Bottom Interval(mm): 300/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 428.00 Rock Type: IGNEOUS
Core: 51 Sample Midpoint(m) : 432.80 Sect/Pc #: 4/PCE 1B
ROCK = GABBRO;
Texture: OPHITIC-SUBOPHITIC;
Where sampled: OTHER
XENOLITH INSIDE DOLERITIC SILL*
Phenocrysts- PLAGIOCLASE ( 30%)
Size(mm): 1-3 Morphology: TABULAR LATHS,RADIATING FIBER
TABULAR LATHS AND QUENCHED MICROLITES WITH
RADIATING FIBERS;
CLINOPYROXENE ( 15%)
Size(mm): 1-4
Groundmass - OLIVINE ( 4%)
Size(mm): 0.5-1 Morphology: ROUNDED,ANHEDRAL
ROUNDED ANHEDRAL GRAINS,REPLACED BY CLAY IN
PLACES;
PLAGIOCLASE ( 30%)
Size(mm): 0.2-1 Morphology: LATHS,ROUND,RADIATING FIBERS
ROUND MICROLITES WITH RADIATING FIBERS,SOME QUENCH
TEXTURED MICROLITES + SMALL LATHS;
CLINOPYROXENE ( 5%)
Size(mm): 0.2-0.5
APPROX COMP AUGITE;
OPAQUE MINERALS ( 10%)
Size(mm): 0.25-6 Morphology: TABULAR,SUBHEDRAL
INCLUDES MAGN + ILMENITE,LARGE AND LONG (4-6 MM)
NEEDLES*
Alteration - COMBINATION ( 10%)
Location: INTERGRAIN Replacing: CPX
Location: BOUNDARIES
INCLUDES BROWNISH GREEN CLAY.MIN + CLEAR FIBROUS
ZEOLITES,AFTER CPX*
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 1130/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 428.00 Rock Type: IGNEOUS
Core: 51 Sample Midpoint(m) : 436.63 Sect/Pc #: 6/PCE 1H
ROCK = DOLERITE;
Texture: OPHITIC;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- PLAGIOCLASE
CPX + PLAG AGGREGATES MAY BE PHENOS BUT ARE
INCLUDED IN THE GROUNDMASS FIGURES;
CLINOPYROXENE
CPX + PLAG AGGREGATES MAY BE PHENOS BUT ARE
INCLUDED IN THE GROUNDMASS FIGURES*
Groundmass - OLIVINE ( 4%)
Size(mm): 0.5-1 Morphology: ANHEDRAL,ROUNDED
SHOWING ALTERATION TO CLAY;
PLAGIOCLASE ( 55%)
Size(mm): 0.5-3 Morphology: LATH-SHAPED
USUALLY ENCLOSED IN CPX;
CLINOPYROXENE ( 35%)
Size(mm): 1-5 Morphology: IRREGULAR,AGGREGATES
APPROX COMP AUGITE,LARGE IRREGULAR XTLS AND
OPTICALLY CONTINUOUS AGGREGATES;
MAGNETITE ( 1%)
Size(mm): 0.3 Morphology: IRREGULAR,SUBHEDRAL
Alteration - CLAY MINERALS ( 5%)
Location: INTERGRANULAR Replacing: MESOSTASIS,OL,FEL
REPLACING MESOSTASIS IS QUESTIONABLE,INCIPIENT
ALTERATION OF FELSPARS*
Leg : 64 Top/Bottom Interval(mm): 850/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 437.00 Rock Type: IGNEOUS
Core: 52 Sample Midpoint(m) : 445.35 Sect/Pc #: 6/PCE 1D
ROCK = DOLERITE;
Texture: SUBOPHITIC-INTERGRANULAR;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- PLAGIOCLASE
LARGE PLAG-CPX INTERGROWTHS MAY BE PHENOS;
CLINOPYROXENE
LARGE PLAG-CPX INTERGROWTHS MAY BE PHENOS*
Groundmass - OLIVINE ( 5%)
Size(mm): 0.3-0.6 Morphology: ROUNDED,ANHEDRAL
PARTIAL ALTERATION TO CLAY;
PLAGIOCLASE ( 40%)
Size(mm): 0.5-1.5 Morphology: LATH-SHAPED
LARGER ONES TEND TO BE IN CPX;
CLINOPYROXENE ( 20%)
Size(mm): 0.3-3
LARGER CPX CONTAIN PLAG (OPHITIC),ALSO SOME
INTERGRANULAR CPX;
MAGNETITE ( 3%)
Size(mm): 0.3-0.5 Morphology: ANHEDRAL,SKELETAL
Alteration - CLAY MINERALS ( 30%)
Location: INTERSTITIAL Replacing: MESOSTASIS,OL
REPLACING MESOSTASIS IS QUESTIONABLE,GREEN*
Leg : 64 Top/Bottom Interval(mm): 280/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 446.00 Rock Type: IGNEOUS
Core: 53 Sample Midpoint(m) : 450.78 Sect/Pc #: 4/PCE 1B
ROCK = APHYRIC BASALT
OR DOLERITE;
Texture: APHYRIC,INTERGRANULAR-DOLERITIC,COARSE;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 2 Morphology: TABULAR
ZONED*
Groundmass - OLIVINE ( 0%)
NONE SEEN;
PLAGIOCLASE ( 50%)
Size(mm): 0.3-1.5 Morphology: LATH-SHAPED
APPROX COMP AN55-60,LATH-SHAPED AND INTERSTITIAL,
FRESH;
CLINOPYROXENE ( 30%)
Size(mm): 0.2-1.5 Morphology: IRREGULAR,ANHEDRAL
APPROX COMP AUGITE,SUBOPHITIC AND INTERGRANULAR;
OPAQUE MINERALS ( 4%)
Size(mm): 0.1-0.5 Morphology: CUBOID-SKELETAL
INCLUDES MAGN + ILMENITE,INTERGRANULAR*
Alteration - CLAY MINERALS ( 10%)
Location: INTERGRANULAR Replacing: MESOSTASIS
REPLACING MESOSTASIS IS QUESTIONABLE,BROWN,
ORE-RICH;
MICA ( 5%)
Location: INTERGRANULAR
BIOTITE?,NOT KNOWN WHAT IS BEING REPLACED*
Leg : 64 Top/Bottom Interval(mm): 760/ 0 Describer: Fornari, D.
Hole: 478 Top of Core Depth(m) : 455.00 Rock Type: IGNEOUS
Core: 54 Sample Midpoint(m) : 455.76 Sect/Pc #: 1/PCE 4B
ROCK = CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,INTERSERTAL,MEDIUM-GRAINED;
Where sampled: OTHER
LOWER MARGIN OF SILL*
Phenocrysts- OLIVINE ( 10%)
Size(mm): <0.5 Morphology: SUBHEDRAL-ANHEDRAL
MICROPHENOS;
CLINOPYROXENE ( 10%)
Size(mm): <0.5 Morphology: SUBHEDRAL-ANHEDRAL
MICROPHENOS*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 0.3 Morphology: LATHS
SMALL LATHS;
OPAQUE MINERALS ( <5%)
INCLUDES MAGN + ILMENITE*
Alteration - CLAY MINERALS ( 45%)
Replacing: GLASS
Leg : 64 Top/Bottom Interval(mm): 500/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 455.00 Rock Type: IGNEOUS
Core: 54 Sample Midpoint(m) : 457.00 Sect/Pc #: 2/PCE 1B
ROCK = APHYRIC BASALT
BADLY ALTERED;
Texture: APHYRIC,INTERSERTAL-INTERGRANULAR;
Where sampled: OTHER
SILL INTERIOR*
Groundmass - OLIVINE ( 0%)
NONE SEEN;
PLAGIOCLASE ( 25%)
Size(mm): 0.1-0.5 Morphology: LATHS
SHORT SMALL LATHS;
CLINOPYROXENE ( 20%)
Size(mm): 0.1-0.6
APPROX COMP AUGITE,SMALL INTERGRANULAR XTLS AND
LARGER OPHITIC XTLS ENCLOSING SOME PLAG;
OPAQUE MINERALS ( 5%)
Size(mm): <0.1 Morphology: ANHEDRAL
INCLUDES MAGN + ILMENITE*
Alteration - OTHER ( 50%)
Location: INTERSTITIAL Replacing: IRREGULAR
A VOID WHICH WAS PROBABLY CLAY.MIN NOW LOST BY
THIN SECTION PREPARATION*
Leg : 64 Top/Bottom Interval(mm): 820/ 0 Describer: Fornari, D.
Hole: 478 Top of Core Depth(m) : 455.00 Rock Type: IGNEOUS
Core: 54 Sample Midpoint(m) : 457.32 Sect/Pc #: 2/PCE 3A
ROCK = CPX-OL-PLAG PHYRIC BASALT;
Texture: PORPHYRITIC,EQUIGRANULAR,FINE-GRAINED;
Where sampled: OTHER
SILL CONTACT*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 0.1-0.3 Morphology: ANHEDRAL
POSSIBLY CPX (TOO SMALL TO SEE),MICROPHENOS;
PLAGIOCLASE ( <3%)
Size(mm): 0.5 Morphology: LATHS
MICROPHENOS,BLOCKY INTERGROWN LATHS,ZONED,IN LOWER
UNIT;
CLINOPYROXENE ( 10%)
Size(mm): 0.1-0.3 Morphology: ANHEDRAL
MICROPHENOS*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): <0.1 Morphology: LATHS
SMALL TINY LATHS IN MESOSTASIS;
OPAQUE MINERALS ( 5%)
INCLUDES MAGN + ILMENITE;
GLASS ( <5%)
Alteration - COMBINATION ( 30%)
Location: MESOSTASIS
INCLUDES CLAY.MIN + ZEOLITES*
Vesicles -
Percent: 0
Leg : 64 Top/Bottom Interval(mm): 1000/ 0 Describer: Fornari, D.
Hole: 478 Top of Core Depth(m) : 455.00 Rock Type: IGNEOUS
Core: 54 Sample Midpoint(m) : 457.50 Sect/Pc #: 2/PCE 4A
ROCK = APHYRIC BASALT;
Texture: APHYRIC,INTERGRANULAR-INTERSERTAL;
Where sampled: OTHER
SILL MARGIN*
Groundmass - OLIVINE ( 0%)
NONE SEEN;
PLAGIOCLASE ( 30%)
Size(mm): 0.2-1.0 Morphology: ELONGATE LATHS
APPROX COMP AN60-65;
CLINOPYROXENE ( 30%)
Size(mm): 0.3-1.0 Morphology: IRREGULAR
APPROX COMP AUGITE,OPTICALLY CONTINUOUS XTLS,
LARGER XTLS SUBOPHITICALLY ENCLOSE PLAG;
MAGNETITE ( 2%)
Size(mm): 0.1-0.2 Morphology: CUBOID-SUBHEDRAL
APPROX COMP TITAN.MT,INTERGRANULAR
MESOSTASIS ( 40%)
APHANITIC,ALTERED*
Alteration - COMBINATION ( 40%)
Location: INTERGRANULAR Replacing: MESOSTASIS
INCLUDES CLAY.MIN + ZEOLITES*
Leg : 64 Top/Bottom Interval(mm): 1300/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 455.00 Rock Type: IGNEOUS
Core: 54 Sample Midpoint(m) : 457.80 Sect/Pc #: 2/PCE 4D
ROCK = APHYRIC BASALT;
Texture: APHYRIC,INTERSERTAL-INTERGRANULAR;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 1 Morphology: ANHEDRAL
RESORBED,ZONED*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): 0.3-1.5 Morphology: LATHS
CLINOPYROXENE ( 30%)
Size(mm): 0.2-0.6 Morphology: ANHEDRAL
APPROX COMP AUGITE?,SOME LARGER XTLS
SUBOPHITICALLY ENCLOSE PLAG;
MAGNETITE ( 1%)
Size(mm): <0.3 Morphology: CUBOID-ELONGATE
Alteration - CARBONATE ( 1%)
Location: VESICLES Replacing: MESOSTASIS
CALCITE IN VESICLES,POSSIBLY SOME CARB IN
MESOSTASIS REPLACEMENT;
CLAY MINERALS ( 30%)
Location: INTERSTICES Replacing: MESOSTASIS,CPX
SOME ALTERATION OF CPX?,GREEN CLAY*
Vesicles -
Size(mm): 1.0-1.5
Percent: 1
Location: RANDOM
Filling: CALCITE
Shape: SPHERICAL
Leg : 64 Top/Bottom Interval(mm): 10/ 0 Describer: Saunders, A.
Hole: 478 Top of Core Depth(m) : 455.00 Rock Type: IGNEOUS
Core: 54 Sample Midpoint(m) : 458.01 Sect/Pc #: 3/PCE 1A
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: SPARSELY PORPHYRITIC,INTERGRANULAR-INTERSERTAL;
Where sampled: OTHER
SILL INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 2.5-3.0 Morphology: LATH-SHAPED
SLIGHTLY ZONED,RESORBED*
Groundmass - OLIVINE ( 0%)
NONE SEEN;
PLAGIOCLASE ( 30%)
Size(mm): 0.2-1.0 Morphology: LATH-SHAPED
APPROX COMP AN60-65;
CLINOPYROXENE ( 20%)
Size(mm): 0.2-0.6 Morphology: ANHEDRAL
APPROX COMP AUGITE,MORE OR LESS EQUIDIMENSIONAL
WITH PLAG*
Alteration - CLAY MINERALS ( 50%)
Location: INTERGRANULAR Replacing: MESOSTASIS,CPX
GREENISH;
PYRITE ( <1%)
Location: VEIN
Leg : 64 Top/Bottom Interval(mm): 00/ 0 Describer: Fornari, D.
Hole: 478 Top of Core Depth(m) : 455.00 Rock Type: IGNEOUS
Core: 54 Sample Midpoint(m) : 459.50 Sect/Pc #: 4/PCE 1A
ROCK = CPX MODERATELY PHYRIC BASALT
SIMILAR TO PIECE 1B OF THIS SECTION (SEE
DESCRIPTION)--PERHAPS A LITTLE MORE ALTERED;
Texture: MODERATELY PORPHYRITIC,INTERSERTAL-APHYRIC;
Where sampled: OTHER
SILL MARGIN*
Phenocrysts- CLINOPYROXENE ( 5%)
Size(mm): 0.5-1.5 Morphology: ANHEDRAL
Groundmass - OLIVINE ( 5%)
Size(mm): 0.1-0.3 Morphology: ANHEDRAL
POSSIBLY ALL CPX?;
PLAGIOCLASE ( 15%)
Size(mm): <0.5 Morphology: LATHS
SMALL LATHS;
CLINOPYROXENE ( 5%)
Size(mm): 0.1-0.3 Morphology: ANHEDRAL
OPAQUE MINERALS ( 5%)
Size(mm): 0.1-0.2
INCLUDES MAGN + ILMENITE,DISPERSED;
GLASS ( 65%)
TOTALLY ALTERED TO CLAY.MIN + ZEOLITES*
Alteration - COMBINATION ( 65%)
Location: MESOSTASIS Replacing: GLASS
INCLUDES CLAY.MIN + ZEOLITES*
Leg : 64 Top/Bottom Interval(mm): 500/ 0 Describer: Fornari, D.
Hole: 478 Top of Core Depth(m) : 455.00 Rock Type: IGNEOUS
Core: 54 Sample Midpoint(m) : 460.00 Sect/Pc #: 4/PCE 1B
ROCK = CPX MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,INTERSERTAL-APHYRIC;
Where sampled: OTHER
SILL MARGIN*
Phenocrysts- CLINOPYROXENE ( 5%)
Size(mm): 0.5-1.5 Morphology: ANHEDRAL
Groundmass - OLIVINE ( 5%)
Size(mm): 0.1-0.3 Morphology: ANHEDRAL
POSSIBLY ALL CPX?;
PLAGIOCLASE ( 15%)
Size(mm): <0.5 Morphology: LATHS
SMALL LATHS;
CLINOPYROXENE ( 5%)
Size(mm): 0.1-0.3 Morphology: ANHEDRAL
OPAQUE MINERALS ( 5%)
Size(mm): 0.1-0.2
INCLUDES MAGN + ILMENITE,DISPERSED;
GLASS ( 65%)
TOTALLY ALTERED TO CLAY.MIN + ZEOLITES*
Alteration - COMBINATION ( 65%)
Location: MESOSTASIS Replacing: GLASS
INCLUDES CLAY.MIN + ZEOLITES*
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