Leg : 59 Top/Bottom Interval(mm): 180/ 200 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 113.00 Rock Type: IGNEOUS
Core: 14 Sample Midpoint(m) : 113.19 Sect/Pc #: 1/PCE 3A
ROCK = PLAG SPARSELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: SPARSELY PORPHYRITIC,SUBOPHITIC;
Where sampled: FLOW INTERIOR
UNIT 1,25 CM FROM TOP*
Phenocrysts- OLIVINE ( 0%)
PLAGIOCLASE ( <2%)
Size(mm): 2
APPROX COMP AN75,GLOMEROCRYSTS;
CLINOPYROXENE ( 0%)
Groundmass - OLIVINE ( 9%)
Size(mm): 0.1
PERCENTAGE UNCERTAIN,REPLACED BY SMEC + CARB;
PLAGIOCLASE ( 46%)
Size(mm): 0.5 Morphology: LATHS
APPROX COMP AN69;
CLINOPYROXENE ( 42%)
Size(mm): 0.2 Morphology: PLUMOSE
PLUMOSE INTERGROWTHS WITH PLAG NOT IN LATHS;
OPAQUE MINERALS ( 5%)
Size(mm): 0.01
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Replacing: OL,PLAG
ONLY SOME PLAG ALTERED;
CLAY MINERALS
Location: VESICLES Replacing: OL,PLAG
SMEC REPLACES OL AND RIMS VESICLES,ONLY SOME PLAG
ALTERED*
SMEC RIMS THE VESICLES*
Vesicles -
Size(mm): 0.2-0.5
Percent: 5
Filling: SMEC
Shape: SPHERICAL
Leg : 59 Top/Bottom Interval(mm): 260/ 290 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 122.00 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 122.28 Sect/Pc #: 1/PCE 2B
ROCK = PLAG SPARSELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: SPARSELY PORPHYRITIC,SUBOPHITIC;
Where sampled: FLOW INTERIOR
UNIT 3*
Phenocrysts- OLIVINE ( 0%)
PLAGIOCLASE ( <2%)
Size(mm): 1 Morphology: BLOCKY
BLOCKY XTLS,GLOMEROCRYSTS;
CLINOPYROXENE ( 0%)
Groundmass - OLIVINE ( 3%)
Size(mm): 0.1
REPLACED WITH CLAYS;
PLAGIOCLASE ( 48%)
Size(mm): 0.8 Morphology: LONG LATHS
CLINOPYROXENE ( 42%)
Size(mm): 0.2-0.4 Morphology: PLUMOSE
SLIGHTLY PLUMOSE BETWEEN PLAG LATHS*
OPAQUE MINERALS ( 3%)
Size(mm): 0.02
INCLUDES MAGN + ILMENITE*
Alteration - COMBINATION ( 5%)
Location: VESICLES Replacing: OL,CPX
INCLUDES CARB + CLAY MINS,ONLY SOME CPX ALTERED,
VESICLES HAVE SMEC RIMS;
HEMATITE
IN MAGN + OL*
Vesicles -
Size(mm): 0.1
Percent: 3
Filling: SMEC
SMEC RIM*
Leg : 59 Top/Bottom Interval(mm): 980/1000 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 122.00 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 124.49 Sect/Pc #: 2/PCE 5B
ROCK = PLAG MODERATELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: MODERATELY PORPHYRITIC,SUBOPHITIC;
Where sampled: FLOW INTERIOR
UNIT 4*
Phenocrysts- OLIVINE ( 0%)
PLAGIOCLASE ( 3%)
Size(mm): 1 Morphology: BLOCKY
IN GLOMEROCRYSTS;
CLINOPYROXENE ( 0%)
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 49%)
Size(mm): 1 Morphology: ELONGATE LATHS
APPROX COMP AN78;
CLINOPYROXENE ( 44%)
OPAQUE MINERALS ( 5%)
INCLUDES MAGN + ILMENITE*
Alteration - COMBINATION ( 10%)
Location: VESICLES Replacing: CPX,PLAG
INCLUDES CARB + CLAY MINS,ONLY SOME PLAG ALTERED;
CARBONATE
Replacing: CPX,PLAG
ONLY SOME PLAG ALTERED;
CLAY MINERALS
Location: VESICLES Replacing: CPX
SMEC IN VESICLES;
HEMATITE ( TR%)
Replacing: PYRITE
ALTERED CUBIC XTLS OF PYRITE = HEMATITE OR MAGN,
RED IN COLOR*
Vesicles -
Size(mm): 0.05-0.3
Percent: <1
Filling: SMEC,RED CUBES
Shape: SPHERICAL
ALTERED CUBIC XTL OF PYRITE = HEMATITE OR MAGN*
Leg : 59 Top/Bottom Interval(mm): 380/ 410 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 122.00 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 126.89 Sect/Pc #: 4/PCE 4B
ROCK = APHYRIC BASALT
THOLEIITIC BASALT;
Texture: APHYRIC,HYALOPILITIC;
Where sampled: FLOW INTERIOR
UNIT 6*
Phenocrysts- OLIVINE ( 0%)
PLAGIOCLASE ( <1%)
Size(mm): 0.8-1
NO GOOD XTLS FOR AN CONTENT;
CLINOPYROXENE ( 0%)
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 46%)
Size(mm): 0.5-0.7
APPROX COMP AN64;
CLINOPYROXENE ( 41%)
Size(mm): 0.2-0.4
OPAQUE MINERALS ( 5%)
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Location: VESICLE
Location: CENTERS
SMECTITE
Location: VESICLE RIMS
Vesicles -
Size(mm): 0.5-1.5
Percent: 7
Location: THROUGHOUT
Filling: SMEC,MAGN,CARB
Shape: SPHERICAL-
Shape: OBLONG
SMEC RIMS + MAGN RHOMBS + CARB CENTERS,EVENLY
DISTRIBUTED*
Leg : 59 Top/Bottom Interval(mm): 320/ 340 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 131.00 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 132.83 Sect/Pc #: 2/PCE 3B
ROCK = APHYRIC BASALT
THOLEIITIC;
Texture: APHYRIC,OPHITIC;
Where sampled: FLOW INTERIOR
UNIT 7*
Groundmass - OLIVINE ( 10%)
Size(mm): 0.25
PERCENTAG UNCERTAIN,ALTERED TO CLAYS + CARB--GREEN
SMEC;
PLAGIOCLASE ( 50%)
Size(mm): 1 Morphology: CURVED LATHS
APPROX COMP AN68;
CLINOPYROXENE ( 35%)
Size(mm): 1
SOME ALTERED;
OPAQUE MINERALS ( 5%)
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Replacing: OL
CLAY MINERALS
Replacing: OL,CPX
ONLY SOME CPX REPLACED*
Leg : 59 Top/Bottom Interval(mm): 1050/1070 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 140.00 Rock Type: IGNEOUS
Core: 17 Sample Midpoint(m) : 144.06 Sect/Pc #: 3/PCE 7D
ROCK = PLAG-CPX PHYRIC BASALT
THOLEIITIC BASALT;
Texture: PORPHYRITIC,SUBVARIOLITIC-SUBOPHITIC;
Where sampled: FLOW INTERIOR
UNIT 10,35 CM FROM TOP*
Phenocrysts- OLIVINE ( 0%)
PLAGIOCLASE ( 9%)
Size(mm): 1 Morphology: BLOCKY
APPROX COMP AN80,GLOMEROCRYSTS WITH CPX + BLOCKY
XTLS;
CLINOPYROXENE ( 6%)
Size(mm): 1
Groundmass - OLIVINE ( 2%)
Size(mm): 0.1 Morphology: SKELETAL
MICROCRYSTS;
PLAGIOCLASE ( 8%)
Size(mm): 0.4 Morphology: ELONGATE LATHS
MICROCRYSTS;
GLASS ( 7%)
COMBINATION ( 67%)
Morphology: PLUMOSE
PLUMOSE INTERGROWTHS OF PLAG WITH CPX,VERY FINE*
Alteration - SMECTITE ( TR%)
Location: VESICLE RIMS
GREEN*
Vesicles -
Size(mm): 0.05
Percent: <1
Filling: SMEC
Shape: SPHERICAL
GREEN SMEC RIMS*
Leg : 59 Top/Bottom Interval(mm): 470/ 490 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 149.00 Rock Type: IGNEOUS
Core: 18 Sample Midpoint(m) : 149.48 Sect/Pc #: 1/PCE 5A
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT
THOLEIITIC BASALT,ESSENTIALLY FRESH;
Texture: MODERATELY PORPHYRITIC,VARIOLITIC;
Where sampled: NEXT TO GLASSY MARGIN
UNIT 11,A FEW CENTIMETERS FROM GLASS*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 0.8
COMPLETELY ALTERED;
PLAGIOCLASE ( 6%)
Size(mm): 1.5
CLINOPYROXENE ( 3%)
Size(mm): 0.8
Groundmass - PLAGIOCLASE ( 5%)
Size(mm): 0.4 Morphology: LATHS
VERY THIN LATHS;
OTHER ( 86%)
95% OF GROUNDMASS IS VARIOLES*
Vesicles -
Size(mm): 0.1-0.2
Percent: <1
Leg : 59 Top/Bottom Interval(mm): 470/ 490 Describer: Zakariakze, G.
Hole: 447A Top of Core Depth(m) : 149.00 Rock Type: IGNEOUS
Core: 18 Sample Midpoint(m) : 149.48 Sect/Pc #: 1/PCE 5A
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: MODERATELY PORPHYRITIC,SUBVARIOLITIC GROUNDMASS;
Where sampled: GLASSY MARGIN
UNIT 11*
Phenocrysts- OLIVINE ( 1-2%)
Size(mm): 1 Morphology: EUHEDRAL
PSEUDOMORPHS;
PLAGIOCLASE ( 3-5%)
Size(mm): 2 Morphology: EUHEDRAL
APPROX COMP AN70,GLOMEROMORPHS;
CLINOPYROXENE ( 2%)
Size(mm): 1-2 Morphology: SUBHEDRAL
Groundmass - PLAGIOCLASE ( 3-5%)
Size(mm): TO 0.5 Morphology: ELONGATE LATHS
APPROX COMP AN60;
CLINOPYROXENE ( 10%)
Size(mm): 0.3 Morphology: IRREGULAR GRAINS
OPAQUE MINERALS ( 3%)
Size(mm): >0.02
INCLUDES MAGN + ILMENITE;
GLASS (70-80%)
Alteration - COMBINATION ( 10%)
Replacing: GLASS,OL,PLAG
INCLUDES CLAY MINS + ZEOLITES;
CLAY MINERALS
Location: VESICLES Replacing: GLASS,PLAG
SMEC FILLS VESICLES + REPLACES PLAG;
ZEOLITE
Location: VESICLES Replacing: OL,PLAG
CARBONATE ( 0%)
Vesicles -
Size(mm): 0.2-0.3
Percent: 1
Filling: SMEC,ZEOLITE
Shape: SPHERICAL
Leg : 59 Top/Bottom Interval(mm): 920/ 940 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 149.00 Rock Type: IGNEOUS
Core: 18 Sample Midpoint(m) : 149.93 Sect/Pc #: 1/PCE 6C
ROCK = CPX-PLAG MODERATELY PHYRIC BASALT
THOLEIITIC BASALT,FRESH;
Texture: MODERATELY PORPHYRITIC,HYALOPILITIC,PLUMOSE PLAG
+ CPX INTERGROWTHS;
Where sampled: FLOW INTERIOR
UNIT 11,ABOUT 50 CM FROM MARGIN*
Phenocrysts- OLIVINE ( 0%)
MAY HAVE MISSED ALTERED OL SEEN IN CORE;
PLAGIOCLASE ( 3.5%)
Size(mm): 1.5
APPROX COMP AN85,GLOMEROCRYSTS WITH CPX;
CLINOPYROXENE ( 6.5%)
Size(mm): 1.5-2.0
TWINS*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 45%)
Size(mm): 0.5
APPROX COMP AN72,PLAG + CPX SLIGHTLY PLUMOSE IN
GRAPHIC INTERGROWTHS;
OPAQUE MINERALS ( 5%)
INCLUDES MAGN + ILMENITE;
GLASS ( 9%)
Size(mm): 1 Morphology: INTERSTITIAL
CLINOPYROXENE ( 31%)
Size(mm): 0.2
PLAG + CPX SLIGHTLY PLUMOSE IN GRAPHIC
INTERGROWTHS*
Leg : 59 Top/Bottom Interval(mm): 1030/1050 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 152.00 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 154.54 Sect/Pc #: 2/PCE 8C
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: MODERATELY PORPHYRITIC,HYALOPILITIC
UNIT 13*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 1.0
REPLACED BY CARB + SMEC;
PLAGIOCLASE ( 3%)
Size(mm): 1.5
APPROX COMP AN76,LARGE GLOMEROCRYSTS WITH CPX;
CLINOPYROXENE ( 1.5%)
Size(mm): 2.5
LARGE GLOMEROCRYSTS WITH PLAG*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 48%)
Size(mm): 0.5-0.8
CLINOPYROXENE ( 38%)
Size(mm): 0.15
OPAQUE MINERALS ( 10%)
Size(mm): 0.04
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Replacing: OL,PLAG
OL COMPLETELY REPLACED,PLAG IS RARELY REPLACED;
SMECTITE
Replacing: OL
OL COMPLETELY REPLACED*
Leg : 59 Top/Bottom Interval(mm): 540/ 560 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 158.00 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 161.55 Sect/Pc #: 3/PCE 2D
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: MODERATELY PORPHYRITIC,SUBOPHITIC-HYALOPILITIC;
Where sampled: FLOW INTERIOR
50 CM FROM GLASS TOP OF FLOW,UNIT 15*
Phenocrysts- OLIVINE ( TR%)
Size(mm): 0.6
IDENTITY UNCERTAIN,PSEUDOMORPHS OF SMEC + IRON
OXIDES;
PLAGIOCLASE ( <5%)
Size(mm): 1.5
SOME GLOMEROCRYSTS;
CLINOPYROXENE ( TR%)
Size(mm): 0.4
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 48%)
Size(mm): 0.35
APPROX COMP AN70;
CLINOPYROXENE ( 38%)
Size(mm): 0.15
OPAQUE MINERALS ( 9%)
Size(mm): 0.02
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Replacing: OL PHENOS
SMECTITE
Replacing: OL PHENOS
CARB+SMEC = 3% OF ROCK*
Leg : 59 Top/Bottom Interval(mm): 1280/1300 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 167.00 Rock Type: IGNEOUS
Core: 21 Sample Midpoint(m) : 168.29 Sect/Pc #: 1/PCE 11
ROCK = PLAG-CPX-OL SPARSELY PHYRIC BASALT
THOLEIITIC BASALT,ESSENTIALLY FRESH;
Texture: SPARSELY PORPHYRITIC,GLASSY-VARIOLITIC;
Where sampled: GLASSY MARGIN,NEXT TO GLASSY MARGIN
UNIT 16*
Phenocrysts- OLIVINE ( TR%)
ALTERED BUT PRESENT,RARE MICROPHENOS IN GLASS;
PLAGIOCLASE ( <2%)
Size(mm): 0.4 Morphology: BLOCKY
APPROX COMP AN68?,COMMON MICROPHENOS IN GLASS
WITH 0.04 MM DIAMETER NUCLEATION CENTERS;
CLINOPYROXENE
Size(mm): 0.1-0.4
LESS ABUNDANT THAN PLAG*
Groundmass - GLASS ( 90%)
INTERGROWTHS WITH PLAG + OL + CPX CENTERS,98% OF
ROCK IS GROUNDMASS*
Leg : 59 Top/Bottom Interval(mm): 510/ 540 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 167.00 Rock Type: IGNEOUS
Core: 21 Sample Midpoint(m) : 172.03 Sect/Pc #: 4/PCE 3B
ROCK = PLAG-CPX-OL SPARSELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: SPARSELY PORPHYRITIC,TRACHYTIC-PILOTAXITIC,
FELTY;
Where sampled: FLOW INTERIOR
UNIT 17*
Phenocrysts- COMBINATION ( 2%)
INCLUDES ALL PHENOS--OL + PLAG + CPX;
OLIVINE
Size(mm): 1
PSEUDOMORPHS OF CLAYS + CARB;
PLAGIOCLASE
CLINOPYROXENE
Groundmass - OLIVINE ( 10%)
Size(mm): 0.04
PERCENTAGE UNCERTAIN,BROWN OXIDES ONLY--IN
SKELETAL SHAPE OF OL;
PLAGIOCLASE ( 44%)
Size(mm): 0.4 Morphology: BLADES,LATHS
PLUMOSE PLAG + CPX BETWEEN PLAG LATHS;
CLINOPYROXENE ( 39%)
PLUMOSE PLAG + CPX BETWEEN PLAG LATHS;
OPAQUE MINERALS ( 5%)
Size(mm): <0.01
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Replacing: OL,PLAG PHENOS
CLAY MINERALS
Replacing: OL,PLAG PHENOS
OXIDES
IDENTITY UNCERTAIN,IN OL*
Leg : 59 Top/Bottom Interval(mm): 560/ 580 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 176.00 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 178.07 Sect/Pc #: 2/PCE 4D
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: MODERATELY PORPHYRITIC,SUBVARIOLITIC;
Where sampled: FLOW INTERIOR
15 CM FROM GLASS TOP
NEAR TOP OF UNIT 19*
Phenocrysts- OLIVINE
IDENTITY UNCERTAIN,MAY BE ALTERED PSEUDOMORPHS;
PLAGIOCLASE ( 3%)
Size(mm): 0.5
APPROX COMP AN74;
CLINOPYROXENE ( TR%)
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 30%)
Size(mm): 0.1
COMBINATION ( 60%)
Morphology: PLUMOSE
INTERGROWTHS OF CPX + PLAG;
OPAQUE MINERALS ( 7%)
Size(mm): 0.005
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Replacing: PLAG
SMECTITE
Location: GROUNDMASS
IDENTITY UNCERTAIN,GREEN,SCATTERED IN PATCHES IN
GROUNDMASS;
FERROUS OXIDE
IN REDDISH PATCHES*
Leg : 59 Top/Bottom Interval(mm): 870/ 900 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 176.00 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 178.39 Sect/Pc #: 2/PCE 6
ROCK = PLAG-OL MODERATELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: MODERATELY PORPHYRITIC,HYALOPILITIC,FELTY;
Where sampled: FLOW INTERIOR
50 CM FROM GLASSY TOP,UNIT 19*
Phenocrysts- OLIVINE
Size(mm): 0.6
LESS ABUNDANT THAN PLAG,ALTERED EXCEPT FOR
REMNANT CENTERS;
PLAGIOCLASE ( <5%)
Size(mm): 0.2-0.4
APPROX COMP AN80*
Groundmass - PLAGIOCLASE ( 48%)
Size(mm): <0.2
PYROXENE ( 43%)
Size(mm): <0.02
CAN NOT TELL WHETHER IT IS CPX OR OPX;
OPAQUE MINERALS ( 4%)
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Replacing: OL PHENOS
SMECTITE
Replacing: OL PHENOS
YELLOW TO GREEN*
Leg : 59 Top/Bottom Interval(mm): 810/ 830 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 180.00 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 183.82 Sect/Pc #: 3/PCE 6B
ROCK = PLAG-CPX MODERATELY PHYRIC BASALT
THOLEIITIC BASALT,ALMOST DOLERITE;
Texture: MODERATELY PORPHYRITIC,SUBOPHITIC,COARSE;
Where sampled: FLOW INTERIOR
UNIT 19*
Phenocrysts- OLIVINE ( 0%)
PLAGIOCLASE ( 5%)
Size(mm): 2
APPROX COMP AN64+?--ONLY ONE MEASUREMENT TAKEN;
CLINOPYROXENE ( TR%)
Size(mm): 1
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 48%)
Size(mm): <1
IN PLUMOSE INTERGROWTHS WITH CPX,APPROX COMP AN67;
CLINOPYROXENE ( 43%)
Size(mm): <1
IN PLUMOSE INTERGROWTHS WITH PLAG;
OPAQUE MINERALS ( 4%)
INCLUDES MAGN + ILMENITE*
Alteration - CLAY MINERALS
Replacing: CPX
ONLY SLIGHTLY ALTERED*
Leg : 59 Top/Bottom Interval(mm): 570/ 590 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 180.00 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 185.08 Sect/Pc #: 4/PCE 3B
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: MODERATELY PORPHYRITIC,SUBOPHITIC;
Where sampled: FLOW INTERIOR
UNIT 19*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 0.5
PSEUDOMORPHS,2% OF ALL PHENOS ARE
GLOMEROCRYSTS-2CM LONG;
PLAGIOCLASE ( 6%)
Size(mm): 1 Morphology: LATHS
1 MM LONG,APPROX COMP AN73;
CLINOPYROXENE ( 3%)
Size(mm): 0.5
SOME CPX POIKILITIC*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 45%)
Size(mm): 0.2
APPROX COMP AN64;
CLINOPYROXENE ( 36%)
Size(mm): 0.04
OPAQUE MINERALS ( 9%)
Size(mm): 0.01
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Replacing: OL
CLAY MINERALS
Replacing: OL
ZEOLITE
Replacing: OL
Vesicles -
Percent: 0
Leg : 59 Top/Bottom Interval(mm): 1270/1290 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 185.00 Rock Type: IGNEOUS
Core: 24 Sample Midpoint(m) : 187.78 Sect/Pc #: 2/PCE 2E
ROCK = DOLERITE
THOLEIITIC DOLERITE;
Texture: APHYRIC,OPHITIC-SUBOPHITIC;
Where sampled: FLOW INTERIOR
BASE OF BASALT FLOW,UNIT 20*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 50%)
Size(mm): 1
APPROX COMP AN72;
CLINOPYROXENE ( 45%)
Size(mm): 1
OPAQUE MINERALS ( 5%)
Size(mm): 0.05
INCLUDES MAGN + ILMENITE*
Alteration - CLAY MINERALS
Replacing: CPX
ONLY SOME CPX ALTERED,THE ROCK IS NEARLY FRESH*
Leg : 59 Top/Bottom Interval(mm): 120/ 140 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 191.00 Rock Type: IGNEOUS
Core: 25 Sample Midpoint(m) : 194.13 Sect/Pc #: 3/PCE 1
ROCK = APHYRIC BASALT
THOLEIITIC BASALT,APHYRIC IN THIN SECTION BUT IN
WHOLE SAMPLE ONE CAN SEE VERY SPARSE OL + PLAG +
CPX--MUST HAVE MISSED;
Texture: APHYRIC,HYALOPILITIC;
Where sampled: FLOW INTERIOR,
UNIT 21*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 39%)
Size(mm): 0.5 Morphology: LATHS
CLINOPYROXENE ( 55%)
FINE-GRAINED PLUMOSE INTERGROWTHS WITH PLAG--IN
INTERSTICES OF PLAG LATHS;
OPAQUE MINERALS ( 5%)
Size(mm): 0.02-0.05
INCLUDES MAGN + ILMENITE*
Alteration - SMECTITE ( 10%)
Location: VESICLES,
Location: GROUNDMASS
SMEC IS BROWNISH,GLASSY INTERSTICES BETWEEN PLAG
LATHS ARE ALTERED*
Vesicles -
Size(mm): 0.05
Percent: 2
Filling: SMEC
Shape: IRREGULAR
SMEC IS BROWN*
Leg : 59 Top/Bottom Interval(mm): 410/ 430 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 216.50 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 216.92 Sect/Pc #: 1/PCE 3A
ROCK = PLAG-OL MODERATELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: MODERATELY PORPHYRITIC,GLASSY-VARIOLITIC
WITH TRACHYTIC ALIGNMENT OF PLAG LATHS;
Where sampled: GLASSY MARGIN
UNIT 23*
Phenocrysts- COMBINATION ( 5%)
INCLUDES ALL PHENOS--OL + PLAG + CPX + SPINEL;
OLIVINE
PHENOS + MICROCRYSTS IN GLASS,MOSTLY REPLACED IN
VARIOLITIC ZONE,FRESH IN GLASS;
PLAGIOCLASE
Size(mm): 1.5
PHENOS + MICROCRYSTS IN GLASS;
CLINOPYROXENE
NONE APPARENT BUT MAY BE ALTERED;
SPINEL
MICROCRYSTS IN GLASS*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE ( 19%)
Size(mm): 0.7 Morphology: ELONGATE LATHS
CLINOPYROXENE ( 0%)
MAGNETITE ( 0%)
ILMENITE ( 0%)
GLASS ( 76%)
DEVITRIFIED GLASS + FRESH GLASS;
PYRITE ( TR%)
0.08 MM DIAMETER PYRITE DECORATED SPHERULE*
Alteration - SMECTITE
Replacing: OL,PLAG
GREEN + GRAY SMEC REPLACES OL + SOME PLAG;
ZEOLITE
Replacing: GLASS
PHILLIPSITE ON EDGE OF GLASS*
Vesicles -
Size(mm): 1
Percent: <1
Filling: SMEC
Shape: SPHERICAL
SMEC LINING PRESENT*
Leg : 59 Top/Bottom Interval(mm): 880/ 900 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 225.50 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 226.39 Sect/Pc #: 1/PCE 2A
ROCK = PLAG-OL PHYRIC BASALT
CLAST FROM BASALTIC FAULT BRECCIA,CEMENTED WITH
CO3 + ZEOLITES;
Texture: PORPHYRITIC,HYALOPILITIC,VARIOLITIC;
Where sampled: FAULT BRECCIA
* UNIT 23*
Phenocrysts- OLIVINE
IDENTITY UNCERTAIN--TOO ALTERED TO TELL IF OL
PHENOS;
PLAGIOCLASE
Size(mm): 0.5-1.0
ALTERED;
CLINOPYROXENE
Size(mm): 0.6
IDENTITY UNCERTAIN--TOO ALTERED TO BE SURE*
Groundmass - COMBINATION
THREE GROUNDMASSES: 1)HYALOPILITIC=0.8 MM LONG
SWALLOW-TAIL CPX LATHS IN MATRIX OF PLAG
(ANTIOPHITIC). 2)HYALOPILITIC=1 MM LONG PLAG LATHS
IN CPX MATRIX (OPHITIC). 3)0.35 LATHS OF PLAG
WITH VARIOLITIC MATRIX OF TYPICAL RAPID QUENCH
TEXTURE OF PILLOW MARGIN---THIS INDICATES SOME
OFFSET ALONG FAULT ZONE;
PLAGIOCLASE
Morphology: LATHS
CLINOPYROXENE
Morphology: SWALLOW-TAIL LATHS
Alteration - CALCITE
Location: VEINS
COATING THE WALLS WITH SURROUNDING ZEOLITES
(PHILLIPSITE?);
ZEOLITE
Location: VEINS
COATING THE VEIN WALLS ALONG WITH CALCITE,MAY BE
PHILLIPSITE?*
Vesicles -
Size(mm): 0.8
Leg : 59 Top/Bottom Interval(mm): 710/ 730 Describer: Zakariakze, G.
Hole: 447A Top of Core Depth(m) : 225.50 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 227.72 Sect/Pc #: 2/PCE 2A
ROCK = OL-PLAG MODERATELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: MODERATELY PORPHYRITIC,SUBOPHITIC;
Where sampled: FLOW INTERIOR
UNIT 23*
Phenocrysts- OLIVINE ( 2-3%)
Size(mm): 1-1.5 Morphology: EUHEDRAL
PSEUDOMORPHS;
PLAGIOCLASE ( 2%)
Size(mm): 1-2 Morphology: SUBHEDRAL
COMPLETELY ALTERED;
CLINOPYROXENE ( 0%)
SPINEL ( 0%)
Groundmass - OLIVINE ( 3-5%)
Size(mm): 0.1 Morphology: SUBHEDRAL
COMPLETELY REPLACED BY SMECTITE + IDDINGSITE;
PLAGIOCLASE ( 40%)
Size(mm): <1 Morphology: ELONGATE LATHS
APPROX COMP ANG7
CLINOPYROXENE ( 30%)
Size(mm): 0.1-0.2 Morphology: PLUMOSE
OPAQUE MINERALS ( 3-5%)
Size(mm): 0.1 Morphology: ANHEDRAL
INCLUDES MAGN + ILMENITE,PARTIALLY REPLACED BY
LIMONITE%
GLASS ( 5-7%)
COMPLETELY ALTERED*
Alteration - CARBONATE ( 2-3%)
Location: VEINS,
Location: VESICLES
FOUND DISSECTING THE ROCK GLASS;
COMBINATION ( 2-3%)
Location: VESICLES Replacing: GLASS,OL
INCLUDES CLAY.MINS + ZEOLITE,SMEC REPLACES OL AND
HELPS FILL VESICLES*
Vesicles -
Size(mm): 0.4-0.5
Percent: 3-5
Filling: SMEC,ZEOLITE,
Shape: SPHERICAL
Filling: CARB
Leg : 59 Top/Bottom Interval(mm): 320/ 330 Describer: Scott, R.
Hole: 447A Top of Core Depth(m) : 225.50 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 228.83 Sect/Pc #: 3/PCE 2B
ROCK = PLAG-CPX-OL PHYRIC BASALT
THOLEIITIC BASALT;
Texture: PORPHYRITIC,VARIOLITIC*
Phenocrysts- COMBINATION ( 15%)
INCLUDES OL + PLAG + CPX + SPINEL--ALL PHENOS;
OLIVINE
Size(mm): 1.2
ALL ALTERED OR REPLACED,HIGHLY RESORBED,REPLACED
BY ZEOLITES + SMECTITE,SOME GLOMEROCRYSTIC;
PLAGIOCLASE
Size(mm): 0.5 Morphology: BLOCKY
CLINOPYROXENE
Size(mm): 0.35 Morphology: BLOCKY
IDENTITY UNCERTAIN--DO NOT SEE IN HAND SAMPLE;
SPINEL ( TR%)
Groundmass - PLAGIOCLASE ( 8%)
Size(mm): 0.25 Morphology: LATHS
VERY THIN LATHS;
GLASS ( 74%)
CONTAINS PLUMOSE INTERGROWTHS OF CPX + PLAG*
Alteration - COMBINATION
Location: VESICLES Replacing: PHENOS
INCLUDES CARB + CLAY MINS + ZEOLITE,ALL THREE
REPLACE PHENOS,CARB MOST COMMONLY REPLACES PLAG,
CLAY MINS + ZEOLITES MOST COMMONLY REPLACE MAFICS,
CLAY MINS + ZEOLITES FILL VESICLES*
Vesicles -
Size(mm): 0.05-1
Percent: 3
Filling: ZEOLITE,
Shape: SPHERICAL+
Filling: CLAY.MIN
Shape: IRREGULAR
SOME HAVE VERY THIN ZEOLITE COATINGS WHILE OTHERS
ARE FILLED WITH ZEOLITE AND COATED WITH CLAY MINS*
Leg : 59 Top/Bottom Interval(mm): 1140/1160 Describer: Zakariakze, G.
Hole: 447A Top of Core Depth(m) : 234.50 Rock Type: IGNEOUS
Core: 30 Sample Midpoint(m) : 240.15 Sect/Pc #: 4/PCE 1L
ROCK = PLAG-OL MODERATELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: MODERATELY PORPHYRITIC;
Where sampled: PILLOW INTERIOR
UNIT 27*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 1 Morphology: IRREGULAR
COMPLETELY ALTERED;
PLAGIOCLASE ( 5%)
Size(mm): 0.5-0.7 Morphology: SUBHEDRAL
COMPLETELY ALTERED*
Groundmass - OLIVINE ( 2-3%)
Size(mm): 0.01
COMPLETELY ALTERED;
PLAGIOCLASE ( 40%)
Size(mm): 0.1 Morphology: ELONGATE LATHS
APPROX COMP AN70;
CLINOPYROXENE ( 30%)
Size(mm): 0.02 Morphology: PLUMOSE
OPAQUE MINERALS ( 2-3%)
Size(mm): <0.01 Morphology: IRREGULAR GRAINS
INCLUDES MAGN + ILMENITE;
GLASS ( 5%)
Morphology: IRREGULAR
ALTERED;
SPINEL ( 0.5%)
Size(mm): <0.01
INCLUDED IN GLASS*
Alteration - CARBONATE ( 2-3%)
Location: VEINS,
Location: VESICLES
COMBINATION ( 5%)
Location: VESICLES Replacing: PLAG,OL,GLASS
INCLUDES CLAY MINS + ZEOLITE,SMEC + ZEOLITE FILL
VESICLES*
Vesicles -
Size(mm): 0.5
Percent: 3
Filling: SMEC,ZEOLITE
Shape: SPHERICAL
Leg : 59 Top/Bottom Interval(mm): 660/ 680 Describer: Zakariakze, G.
Hole: 447A Top of Core Depth(m) : 275.00 Rock Type: IGNEOUS
Core: 35 Sample Midpoint(m) : 277.17 Sect/Pc #: 2/PCE 1F
ROCK = PLAG-OL MODERATELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: MODERATELY PORPHYRITIC,SUBOPHITIC GROUNDMASS;
Where sampled: PILLOW INTERIOR
UNIT 30*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 2 Morphology: IRREGULAR
COMPLETELY ALTERED;
PLAGIOCLASE ( 8%)
Morphology: EUHEDRAL PRISMS
APPROX COMP AN76,HIGHLY ALTERED;
CLINOPYROXENE ( 0%)
SPINEL ( TR%)
Size(mm): 0.2
ONE CRYSTAL,RESORBED*
Groundmass - OLIVINE ( 10%)
Size(mm): 0.1-0.2 Morphology: IRREGULAR
COMPLETELY ALTERED;
PLAGIOCLASE ( 35%)
Size(mm): 0.5 Morphology: ELONGATE LATHS
APPROX COMP AN69*
CLINOPYROXENE ( 30%)
Size(mm): <0.02 Morphology: PLUMOSE
OPAQUE MINERALS ( 5%)
Size(mm): <0.01
INCLUDES MAGN + ILMENITE;
GLASS ( 2-3%)
COMPLETELY ALTERED;
ORTHOPYROXENE ( 0%)
QUARTZ ( 0%)
ALKALI FELDSPAR ( 0%)
Alteration - CARBONATE ( 5%)
Location: VEINS
COMBINATION
Replacing: OL,GLASS,PLAG
INCLUDES CLAY.MINS + ZEOLITES*
Vesicles -
Percent: 0
Leg : 59 Top/Bottom Interval(mm): 950/ 970 Describer: Zakariakze, G.
Hole: 447A Top of Core Depth(m) : 284.00 Rock Type: IGNEOUS
Core: 36 Sample Midpoint(m) : 284.96 Sect/Pc #: 1/PCE 2D
ROCK = PLAG-OL MODERATELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: MODERATELY PORPHYRITIC,SUBOPHITIC GROUNDMASS;
Phenocrysts- OLIVINE ( 1%)
Size(mm): 1-2 Morphology: IRREGULAR
AS PSEUDOMORPHS;
PLAGIOCLASE ( 5-7%)
Size(mm): 1-2 Morphology: EUHEDRAL
ONE BIG XENOCRYST (1X0.5 CM);
CLINOPYROXENE ( 0%)
SPINEL
Size(mm): 0.2 Morphology: EUHEDRAL
INCLUDED IN PLAG XENOCRYST AS WELL AS IN THE
GROUNDMASS*
Groundmass - OLIVINE ( 0%)
PLAGIOCLASE (30-35%)
Size(mm): <0.8 Morphology: ELONGATED LATHS
CLINOPYROXENE ( 25%)
Size(mm): 0.01 Morphology: PLUMOSE
OPAQUE MINERALS ( 2-3%)
Size(mm): <0.01
INCLUDES MAGN + ILMENITE;
GLASS ( 3-5%)
ORTHOPYROXENE ( 0%)
Alteration - CARBONATE
Replacing: OL
Vesicles -
Percent: 0
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