Leg : 67 Top/Bottom Interval(mm): 1150/1500 Analyst: Cowan, D.S.
Hole: 495 Sample Midpoint (m) : 429.00
Core: 46 Top of Core Depth (m) : 427.50
Sect: 1 Top of Section Depth(m): 428.65
LITHOLOGY: OL-PLAG MICROPHYRIC BASALT;
Piece No. : PCES 1 (117-123), 2 (125-130), 3 (133-135),
4 (137-144), 5 (146-150);
Texture : MICROPHYRIC, GROUNDMASS IS CRYSTALLINE AND
MICROLITIC;
Structure : PCE 1 CONTAINS CAVITIES COMPLETELY FILLED WITH
CRYSTALLINE WHITE CALCITE;
Alteration : SLIGHTLY;
Comments : DARK GREY, THE ACTUAL CONTACT OF BASALT AND
FORAMINIFERAL NANNOFOSSIL CHALK IS NOT PRESERVED,
BUT LOWEST CHALK CONTAINS ABUNDANT WELL-PRESERVED
FORAMS;
Phenocrysts: OLIVINE ( <7%)
Size(mm): <1
OL ALTERED TO ORANGE-BROWN MATERIAL, LOCALLY
CLUSTERED (D; %)
PLAGIOCLASE ( <4%)
Size(mm): 2
PLAG PHENOS AVERAGE 2MM. LONG;
Replacement: CALCITE
Leg : 67 Top/Bottom Interval(mm): 0/1050 Analyst: Cowan, D.S.
Hole: 495 Sample Midpoint (m) : 429.55
Core: 47 Top of Core Depth (m) : 428.50
Sect: 1 Top of Section Depth(m): 428.50
LITHOLOGY: OL-PLAG MODERATELY PHYRIC BASALT;
Piece No. : PCES 1A (0-15), 1B (25-20), 2A (22-27), 2B (27-31),
3 (33-39), 4A (44-50), 4B (50-58), 4C (57-63),
5 (72-75), 6A (82-85), 6B (85-95), 6C (95-105);
Texture : GENERALLY PHYRIC, GROUNDMASS IS MICROLITIC AND
CRYSTALLINE TO APHANITIC, PCE 3A TOP HAS 1 CM
ALTERED GLASS RIM, PCE IN 5 IS ALSO PARTLY GLASS;
Structure : PCE 4A HAS WHITE CRYSTALLINE VEIN(<1MM) SURROUNDED
BY TAN ALTERED GROUNDMASS SAME FOR SOME PCES IN 5;
Alteration : FRESH
PCES 1A-3, PCE 3 HAS ALTERED GLASSY RIM ON TOP;
MOD
PCES 4A-6C MOD ALTERED, PCE 4A SURROUNDED BY TAN
ALTERED GROUNDMASS AS WELL AS SOME PCES IN 5, OL
PARTLY ALTERED TO ORANGE-BROWN CLAY(?), PCES 2A &
2B OX STAINS;
Comments : DARK GREY TO TAN BASALT, PCES 2A & 2B ARE CREAMY
WHITE AND FIRM(BAKED CHALK?) WITH BLACK DENDRITIC
OX STAINS & ANGULAR 2-5MM FRAGMENTS OF GREENISH
YELLOW WAXY MATERIAL;
Phenocrysts: OLIVINE ( 5%)
Size(mm): <2
PARTLY ALTERED TO ORANGE-BROWN CLAY(?);
PLAGIOCLASE ( 3%)
Size(mm): TO 4
PRESENT AS LATHS;
Replacement: CLAY
Minerals Replaced: OL
ORANGE-BROWN, ID CLAY UNCERTAIN;
CLAY
Minerals Replaced: GLASS
ORANGE-BROWN;
Leg : 67 Top/Bottom Interval(mm): 0/1500 Analyst: Cowan, D.S.
Hole: 495 Sample Midpoint (m) : 438.00
Core: 48 Top of Core Depth (m) : 436.50
Sect: 1 Top of Section Depth(m): 436.50
LITHOLOGY: OL-PLAG MODERATELY PHYRIC BASALT;
Piece No. : PCES 1 (0-5), 2 (10-21), 3 (25-30), 4 (32-35),
5A (38-46), 5B (49-51), 5C (51-60), 6 (65-67),
7 (70-75), 8 (79-87), 9 (90-97), 10 (100-106),
11 (107-123), 12 (124-130), 13 (133-138),
14 (141-150);
Texture : PHYRIC, PCES 4 & 6 & 10 HAVE GLASSY BROWN-BLACK RIM
(TO 1CM);
Structure : PCES 12 & 8 ALTERATION RELATED TO 1-2MM WHITE
CRYSTALLINE VEINS, ALTERNATING GLASSY AND FRESH
PCES SUGGEST PILLOW LAVA;
Alteration : MOD-FRESH
25-50CM & 60-89CM & 100-150CM,
LOCALLY SMALLER PCES(6) ARE ALTERED THROUGHOUT AND
REDDISH-BROWN IN COLOR, PCES 4 & 6 & 10 HAVE
GLASSY BROWN-BLACK RIMS LOCALLY ALTERED TO ORANGE
BROWN CLAY, PCES 12 & 8 ALTERATION AS IN 6 RELATED
TO CRYSTALLINE VEINS;
Comments : DARK GREY;
Vesicles : Size(mm): 1-3 Percent:
Location: Filling: CLAY
PCE 11 GREEN WAXY CLAY;
Phenocrysts: OLIVINE ( 5%)
Size(mm): <2
LOCALLY REPLACED BY ORANGE-BROWN ALTERATION
MATERIALS;
PLAGIOCLASE ( 2%)
Size(mm): TO 3
Replacement: CLAY
Leg : 67 Top/Bottom Interval(mm): 0/1400 Analyst: Cowan, D.S.
Hole: 495 Sample Midpoint (m) : 439.40
Core: 48 Top of Core Depth (m) : 436.50
Sect: 2 Top of Section Depth(m): 438.00
LITHOLOGY: OL-PLAG MOD PHYRIC BASALT;
Piece No. : PCES 1 (0-2), 2 (7-14), 3 (16-25), 4 (27-35),
5 (37-39), 6 (41-49), 7 (50-58), 8 (60-66),
9A (68-78), 9B(79-87), 10 (90-96), 11 (98-110),
12 (111-126), 13A (129-136), 13B (136-140);
Texture : PHYRIC, MICROLITIC, PCES 5 & 6 & 8 HAVE GLASSY RIMS;
Structure : PCE 6 HAS 2CM PATCH OF DRUSY CALCITE COATING
INDENTATION IN GLASSY RIM, PCE 7 CONTAINS 1-2MM
WHITE VEINS WITH ADJACENT RED BROWN ALTERED ZONES;
Alteration : MOD
PCES 1-8 ALTERED TO PALE BROWN TO RED BROWN, OL
ALTERS TO ORANGE BROWN CLAY APPROACHING GLASS RIM
PCES 5 & 6 & 8, PCE 7 CONTAINS VEINS WITH ADJACENT
RED BROWN ALTERED ZONES;
FRESH
PCES 9-13;
Phenocrysts: OLIVINE ( <5%)
Size(mm): TO 2
PLAGIOCLASE ( <2%)
Size(mm): TO 4
Replacement: CALCITE
DRUSY CALCITE COATING INDENTATION IN GLASSY RIM OF
PCE 6;
Leg : 67 Top/Bottom Interval(mm): 0/1100 Analyst: Cowan, D.S.
Hole: 495 Sample Midpoint (m) : 440.60
Core: 48 Top of Core Depth (m) : 436.50
Sect: 3 Top of Section Depth(m): 439.50
LITHOLOGY: OL-PLAG MOD PHYRIC BASALT;
Piece No. : PCES 1A (0-15), 1B (15-26), 2A (31-40), 2B (41-46),
2C (46-65), 3 (67-74), 4A (81-100), 4B (101-109),
Texture : PHYRIC, PCES 2-4 HAVE GLASSY RIMS, MICROLITIC
GROUNDMASS;
Structure : PCE 2C HAS VEIN, PCE 1A HAS PATCHES FILLED WITH
DRUSY CALCITE, PCES 1A & 2-4 PROBABLY ALL PILLOW
BASALTS;
Alteration : MOD TO FRESH
46-86CM MOD, OL PHENOS LOCALLY ALTERED TO RED
BROWN CLAY, BASALT LOCALLY ALTERED TO REDDISH
BROWN, ALTERED IN VICINITY OF VEIN IN 2C;
Comments : DARK GREY WHERE FRESH;
Vesicles : Size(mm): 3 Percent:
Location: Filling: CALCITE
PCE 1A DRUSY CALCITE;
Phenocrysts: OLIVINE ( <5%)
Size(mm): <2
PLAGIOCLASE ( 2%)
Size(mm): 2
MICROPHENOS;
Replacement: CALCITE
Leg : 67 Top/Bottom Interval(mm): 0/1300 Analyst: Cowan, D.S.
Hole: 495 Sample Midpoint (m) : 442.30
Core: 48 Top of Core Depth (m) : 436.50
Sect: 4 Top of Section Depth(m): 441.00
LITHOLOGY: OL-PLAG MOD PHYRIC BASALT;
Piece No. : PCES 1A (0-16), 1B (16-24), 1C (15-30), 1D (31-40)
1E (41-48), 1F (50-53), 1G (55-60), 1H (61-76),
1I (75-85), 2 (89-94), 3 (96-104), 4 (106-110),
5A (115-121), 5B (120-122), 6 (124-130);
Texture : MOD PHYRIC, PCES 1A-1G HAVE GLASSY SELVAGES-PROBABLY
CHILLED RIMS OF PILLOWS;
Structure : GLASSY SELVAGES IN PCES 1A-1G ARE PROBABLY CHILLED
RIMS OF PILLOWS, SOME FRACTURES IN 1B & C COATED
WITH GREENISH CLAY, 1B HAS 2CM CAVITY LINED WITH
CALCITE CRYSTALS, 1C HAS A 1X2CM LARGE CAVITY FILLED
WITH CREAMY CALCITE;
Alteration : MOD
PCES 1A-1G ARE ALTERED AND PARTLY REDDISH BROWN,
OL ALTERED TO REDDISH BROWN AND GREEN CLAY;
FRESH
PCES 1H-5 EXTREMELY FRESH;
MOD
PCE 6;
Comments : DARK GREY TO RED BROWN ALTERED BASALT;
Phenocrysts: OLIVINE ( 2%)
Size(mm): <1
PLAGIOCLASE ( 2%)
Size(mm): TO 4
Groundmass : MICROLITIC;
Replacement: CALCITE
LINES CAVITY IN 1B IN FORM OF CALCITE CRYSTALS,
FILLS CAVITY IN 1C WITH CREAMY CALCITE;
Leg : 67 Top/Bottom Interval(mm): 0/ 200 Analyst: Cowan, D.S.
Hole: 495 Sample Midpoint (m) : 446.20
Core: 49 Top of Core Depth (m) : 446.00
Sect: 1 Top of Section Depth(m): 446.00
LITHOLOGY: OL-PLAG MOD PHYRIC BASALT;
Piece No. : PCES 1 (0-4), 2 (10-19);
Texture : MOD PHYRIC, MEDIUM TO FINE GRAINED, GROUNDMASS
LOCALLY VARIOLITIC;
Structure : FRACTURES LOCALLY COATED WITH OLIVINE GREEN CLAY;
Alteration : FRESH;
Phenocrysts: OLIVINE ( 5%)
Size(mm): TO 2
PLAGIOCLASE ( 1%)
Size(mm): TO 2
PLAG PRESENT AS LATHS;
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