Leg : 73 Top/Bottom Interval(mm): 600/ 0 Describer: Carman, M.
Hole: 524 Top of Core Depth(m) : 275.50 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 279.10 Sect/Pc #: 3/
ROCK = APHYRIC BASALT;
Texture: SPHERULITIC,ELONGATE;
Where sampled: GLASSY MARGIN;
SECTION TOO THICK FOR DETAILED EXAMINATION*
Groundmass - PLAGIOCLASE
Morphology: SWALLOW-TAIL,HOLLOW SKELETON
ELONGATE WITH SPHERULES OVERGROWN;
CLINOPYROXENE
Morphology: DENDRITES
GLASS
DARK BROWN,INCLUDES SPHERULES*
Leg : 73 Top/Bottom Interval(mm): 710/ 0 Describer: Carman, M.
Hole: 524 Top of Core Depth(m) : 275.50 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 279.21 Sect/Pc #: 3/
ROCK = PLAG SPARSELY PHYRIC BASALT
SPILITIC?,NA-RICH PLAG+ALBITE REPLACEMENT;
Texture: ELONGATE-HYALOPILITIC;
Where sampled: GLASSY MARGIN?,PILLOW INTERIOR?*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 0.7-1.6 Morphology: ANHEDRAL,CORRODED
APPROX ONE HALF REPLACED BY NA-FELDSPAR+SMEC OR
CHLORITE*
Groundmass - PLAGIOCLASE (30-40%)
Size(mm): 0.04-0.5 Morphology: SUBHEDRAL,ELONGATE
HOLLOW CORES INCLUDING SOME CRUDE SWALLOW-TAILS,
APPROX COMP NA-RICH,REFRACTIVE INDEX <1.55;
CLINOPYROXENE ( 3-5%)
Size(mm): 0.006 Morphology: ANHEDRAL;
MAGNETITE ( <1%)
Size(mm): 0.004-0.25 Morphology: CUBES+OCTAHEDRAL
TWO GENERAL TYPES MAGN;
MAGNETITE ( 5%)
Size(mm): 0.005-0.02 Morphology: CUBES;
ILMENITE ( 15%)
Size(mm): 0.001X0.04 Morphology: DENDRITIC NEEDLES
IDENTITY UNCERTAIN FOR ILMENITE;
ILMENITE
Size(mm): 0.004X0.2
IDENTITY UNCERTAIN FOR ILMENITE;
GLASS (40-50%)
SEE CLAY.MINS;
APATITE ( 1-3%)
Size(mm): .004-0.008 Morphology: HOLLOW SKELETON*
Alteration - CLAY MINERALS (40-50%)
Location: MESOTASIS Replacing: PLAG,GLASS
INCLUDES SMEC? OR CHLORITE*
Leg : 73 Top/Bottom Interval(mm): 1470/ 0 Describer: Carman, M.
Hole: 524 Top of Core Depth(m) : 285.00 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 286.47 Sect/Pc #: 1/PCE 1A
ROCK = APHYRIC BASALT
OL BASALT?,DIABASE?,SPILITE?, NA-RICH PLAG;
Texture: INTERGRANULAR,INTERSERTAL;
Where sampled: SILL INTERIOR?*
Groundmass - OLIVINE ( 2-3%)
Morphology: SUBEQUANT-EUHEDRAL?
POSSIBLE SMEC PSEUDOMORPH,ID UNCERTAIN FOR OL;
PLAGIOCLASE (35-45%)
Size(mm): 0.05-0.3 Morphology: ANHEDRAL,BROAD TABULAR
APPROX COMP AN43 BY CB-AB,REFRACT.INDEX <1.55,
WEAKLY ZONED,MANY WITH CORES ALTERED TO BROWN
SMEC;
CLINOPYROXENE (15-20%)
Size(mm): 0.005-0.25 Morphology: EUHEDRAL-ANHEDRAL
2VZ = 60,INTERGRANULAR GRAINS;
OPAQUE MINERALS (15-20%)
Size(mm): 0.005-0.35 Morphology: PLATES,NEEDLES,CUBES,
Morphology: OCTAHEDRA
INCLUDES MAGN + ILMENITE;
GLASS (15-20%)
Morphology: INTERSTITIAL-INTERSERTAL
ALTERED TO OLIVE BROWN SMEC;
APATITE ( 1-2%)
Size(mm): 0.01-0.15 Morphology: EUHEDRAL NEEDLES
LENGTH / WIDTH = 1 TO 12;
BIOTITE ( <1%)
Size(mm): 0.02 Morphology: EUHEDRAL PLATES
TI-BEARING?,PLEOCHROIC REDDISH BROWN*
Alteration - CLAY MINERALS
Replacing: INTERSERTAL MESOSTASIS +
Replacing: PLAG
INCLUDES OLIVE BROWN SMEC*
Leg : 73 Top/Bottom Interval(mm): 0/ 0 Describer: Carman, M.
Hole: 524 Top of Core Depth(m) : 285.00 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 287.30 Sect/Pc #: CC/
ROCK = APHYRIC BASALT
ALKALI DIABASE?,SPILITIC?,NA-RICH PLAG;
Texture: SPARSELY+FINELY MICROPHYRIC,INTERGRANULAR,
INTERSERTAL;
Where sampled: FLOW OR SILL INTERIOR*
Phenocrysts- CLINOPYROXENE ( <1%)
Size(mm): 0.16-0.72 Morphology: SUBHEDRAL STUBBY PRISMS
FINE PLAG-SMEC VEINLET ACROSS SLIDE,ORIGIN AND
COMPOSITION OF PLAG UNKNOWN*
Groundmass - PLAGIOCLASE (50-60%)
Size(mm): 0.09-0.95 Morphology: ANHEDRAL-SUBHEDRAL-TABULAR
STRONG-EVEN-NORMAL ZONING;
APPROX COMP AN44-17,AN36-17 BY CB-AB,2VX=60-70,
AN25-30 (OUTER ZONE),MAX AN43;
CLINOPYROXENE (15-20%)
Size(mm): 0.01-0.15 Morphology: ANHEDRAL-EUHEDRAL STUBBY
Morphology: PRISMS;
2VZ = 50-60,INTERGRANULAR;
MAGNETITE (10-15%)
Size(mm): 0.01-0.20 Morphology: CUBES + OCTAHEDRA;
ILMENITE ( 3-5%)
Size(mm): 0.02-0.35 Morphology: THICK HEXAGONAL PLATES
APATITE ( 2-4%)
Morphology: NEEDLES TO LONG PRISMS +
Morphology: STUBBY PRISMS
MOST HAVE HOLLOW CORES;
BIOTITE ( <1%)
Size(mm): 0.02-0.2 Morphology: EUHEDRAL PLATES
TI-BEARING?*
Alteration - CARBONATE (E <1%)
Location: SCATTERED;
INTERSTITIAL + INTERSERTAL PATCHES;
CLAY MINERALS ( 10%)
Location: PLAG Replacing: PLAG
THIN CORES IN PLAG INTERSTITIAL + IN INTERSERTAL;
PATCHES,IDENTITY UNCERTAIN FOR PLAG*
Leg : 73 Top/Bottom Interval(mm): 1170/ 0 Describer: Carman, M.
Hole: 524 Top of Core Depth(m) : 294.50 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 295.67 Sect/Pc #: 1/PCE 10
ROCK = APHYRIC BASALT
OR DIABASE;
Texture: MICROPHYRIC,INTERGRANULAR,INTERSERTAL;
Where sampled: SILL INTERIOR?*
Groundmass - OLIVINE ( 2-3%)
Size(mm): 0.12-0.35
POSSIBLE OL PSEUDOMORPH (SMEC),EPITAXIAL MANTLES
ON PLAG,2VX < 60;
BIOTITE ( <1%)
Size(mm): 0.02-0.2 Morphology: EUHEDRAL PLATES
APPROX COMP TI-BEARING?*
Alteration - CLAY MINERALS
Replacing: OL
INCLUDES OLIVE BROWN SMEC,ID UNCERTAIN FOR OL*
Leg : 73 Top/Bottom Interval(mm): 700/ 0 Describer: Carman, M.
Hole: 524 Top of Core Depth(m) : 327.50 Rock Type: IGNEOUS
Core: 33 Sample Midpoint(m) : 328.20 Sect/Pc #: 1/PCE 1D
ROCK = PLAG SPARSELY PHYRIC BASALT
DIABASE?, OLIVINE BASALT?;
Texture: SERIATE,INTERGRANULAR,SUBOPHITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE
Size(mm): 0.5-3.8
APPROX COMP AN65-55 BY CB-AB,COMPLEXLY TWINNED
PHENOS,ALT.CORE,STRONGLY ZONED RIM*
Groundmass - OLIVINE ( 1-3%)
Size(mm): 0.09-.3 Morphology: EUHEDRAL,SUBEQUANT;
POSSIBLE SMEC PSEUDOMORPH,ID UNCERTAIN FOR OL;
PLAGIOCLASE (30-40%)
Size(mm): 0.01-0.5 Morphology: SUBHEDRAL-ANHEDRAL,ELONGATED,
Morphology: TABULAR
APPROX COMP AN62-47 BY CB-AB,2V=90,STRONGLY ZONED;
CLINOPYROXENE (30-40%)
Size(mm): 0.005-0.75 Morphology: EUHEDRAL-ANHEDRAL,
Morphology: EQUIGRANULAR
0.005-0.04 MM MOST ABUNDANT,RARE SUBOPHITIC;
OPAQUE MINERALS (15-20%)
Size(mm): 0.004-0.12 Morphology: ANHEDRAL SKELETONS,CUBES,
Morphology: OCTAHEDRA,HEXAGONAL PLATES
INCLUDES MAGN + ILMENITE,ILMENITE MAY DOMINATE*
Alteration - CLAY MINERALS ( 10I%)
Location: NTERSTITIAL Replacing: OL, PLAG
INCLUDES OLIVE BROWN SMEC,ID UNCERTAIN FOR OL*
Leg : 73 Top/Bottom Interval(mm): 60/ 0 Describer: Carman, M.
Hole: 524 Top of Core Depth(m) : 327.50 Rock Type: IGNEOUS
Core: 33 Sample Midpoint(m) : 329.06 Sect/Pc #: 2/PCE 1A
ROCK = CPX SPARSELY PHYRIC DIABASE;
Texture: SERIATE,INTERGRANULAR,SUBOPHITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- CLINOPYROXENE ( 1%)
Size(mm): 0.48-1.1 Morphology: EUHEDRAL-ANHEDRAL STUBBY
Morphology: PRISMS
Groundmass - OLIVINE (20-40%)
Size(mm): 0.3-0.4
TWO GENERAL TYPES OL;
OLIVINE ( 2-3%)
Size(mm): 0.1-0.5
MANY REACTED TO AUGITE,SPARSE PATCHES ALTERED TO
SMEC + CHLORITE;
PLAGIOCLASE
Size(mm): 0.4
APPROX COMP AN65-42 BY CARLSBAD-ALBITE METHOD;
3 GENERAL TYPES PLAG;
PLAGIOCLASE
Size(mm): 1.1
APPROX COMP AN63-30 BY CARLSBAD-ALBITE METHOD;
PLAGIOCLASE
Size(mm): 0.47
APPROX COMP AN58-30 BY CARLSBAD-ALBITE METHOD;
CLINOPYROXENE
Size(mm): 0.01-0.11 Morphology: SUBHEDRAL-EUHEDRAL,
Morphology: STUBBY PRISMS
IN CLUSTERS,IN SUBOPHITIC RELATION TO PLAG;
OPAQUE MINERALS
Size(mm): 0.02-0.3
INCLUDES MAGN+ILMENITE,ILMENITE DOMINATES,STRONG
TENDENCY TO CLUSTER INTO CLOTS+STRINGERS*
Alteration - CLAY MINERALS
Replacing: PLAG + OL
INCLUDES OLIVE BROWN SMEC,ID UNCERTAIN FOR OL;
CHLORITE (,GREE%)
Location: N Replacing: OL
ID UNCERTAIN FOR OL*
Leg : 73 Top/Bottom Interval(mm): 370/ 0 Describer: Carman, M.
Hole: 524 Top of Core Depth(m) : 332.50 Rock Type: IGNEOUS
Core: 34 Sample Midpoint(m) : 332.87 Sect/Pc #: 1/PCE 1B
ROCK = PLAG SPARSELY PHYRIC BASALT
DIABASE?,OL BASALT;
Texture: SERIATE,INTERGRANULAR,SUBOPHITIC;
Where sampled: SILL INTERIOR*
Phenocrysts- PLAGIOCLASE
Size(mm): 0.8
APPROX COMP AN65-55 BY CARLSBAD-ALBITE METHOD;
Groundmass - PLAGIOCLASE
Size(mm): 0.45
APPROX COMP AN61-28 BY CARLSBAD-ALBITE METHOD,
STRONGLY ZONED,THIS XTL HAS SAME MINERALOGY AS
73-524-33-1-70*
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