Leg : 80 Top/Bottom Interval(mm): 0/ 890 Analyst: DeGraciansky, P.C.
Hole: 551 Sample Midpoint (m) : 145.89
Core: 6 Top of Core Depth (m) : 142.00
Sect: 3 Top of Section Depth(m): 145.00
LITHOLOGY: SEDIMENT;
Leg : 80 Top/Bottom Interval(mm): 890/1350 Analyst: DeGraciansky, P.C.
Hole: 551 Sample Midpoint (m) : 146.35
Core: 6 Top of Core Depth (m) : 142.00
Sect: 3 Top of Section Depth(m): 145.89
LITHOLOGY: PLAG MOD PHYRIC BASALT;
Piece No. : PCES 1A (89-102), 1B (102-109), 2 (112-121),
3 (124-132);
Texture : MOD PHYRIC,VERY FINE-GRAINED(CHILLED);
Structure : VEINED BY CARB.UNSPEC SEDIMENTS;
Alteration : MOD
ALTERATION IMPORTANT ALONG VEINS;
Comments : ALTERED BASALT IS REDDISH-BROWN(5YR 4/4),UNALTERED
BASALT IS BROWNISH-GRAY(10YR 5/2);
Vesicles :
Location: Filling: CALCITE
VESICLES FILLED WITH CALCITE;
Phenocrysts: PLAGIOCLASE ( 5-10%)
Replacement: CALCITE
FILLS VESICLES;
CARBONATE
CARB.UNSPEC-FILLED VEINS;
Leg : 80 Top/Bottom Interval(mm): 0/ 600 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 147.10
Core: 6 Top of Core Depth (m) : 142.00
Sect: 4 Top of Section Depth(m): 146.50
LITHOLOGY: PLAG MOD PHYRIC BASALT;
Piece No. : PCES 1A (0-25), 1B (27-36), 1C (36-60);
Texture : MOD PHYRIC,VERY FINE-GRAINED(CHILLED);
Structure : CALCITE & SMEC & CARB.UNSPEC VEINS;
Alteration : MOD
ALTERATION ALONG VEINS;
Comments : MEDIUM-BROWN(5YR 4/4) IN ALTERED AREAS & DARK-BROWN
(10YR 2/2) ELSEWHERE;
Vesicles :
Location: Filling: CALCITE
Phenocrysts: PLAGIOCLASE ( 5-10%)
Size(mm): 2-3
Replacement: CALCITE
CALCITE FILLS VEINS & VESICLES;
CARBONATE
SMECTITE
CARB.UNSPEC & SMEC FILL VEINS;
Leg : 80 Top/Bottom Interval(mm): 0/1500 Analyst: Masson, D.G.
Hole: 551 Sample Midpoint (m) : 152.50
Core: 8 Top of Core Depth (m) : 151.00
Sect: 1 Top of Section Depth(m): 151.00
LITHOLOGY: PLAG PHYRIC BASALT;
Piece No. : PCES 1 (2-10), 2 (11-18), 3A (20-30), 3B (31-40),
3C (41-71), 3D (71-77), 3E (77-106), 4A (119-141),
4B (140-149);
Texture : PHYRIC,CHILLED MARGIN BETWEEN PCES 3D+3E(DEVT.GLAS);
Structure : TWO LAVA FLOWS,HIGHLY FRACTURED,CALCITE VEINS;
Alteration : FRESH TO SLIGHTLY
PCES 1-3A+3D-3E+4B ARE SLIGHTLY ALTERED THE REST
OF THE SECTION IS FRESH;
Comments : DUSKY-BROWN(5YR 2/2) BASALT IN ALTERED AREAS TO
DARK-BROWN(10YR 2/2) ELSEWHERE;
Vesicles :
Location: Filling: CALCITE,SMEC
CALCITE & SMEC(?)-FILLED VESICLES THROUGHOUT
EXCEPT PCE 3C WHICH HAS NO VESICLES(OR VERY RARE);
Phenocrysts: PLAGIOCLASE (15-20%)
Size(mm): 4-5
PLAG LOOKS LIKE ISOLATED XTLS;
Replacement: CALCITE
CALCITE IN VEINS & VESICLES;
SMECTITE
SMEC IN VESICLES-ID UNCERTAIN;
Leg : 80 Top/Bottom Interval(mm): 0/1500 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 154.00
Core: 9 Top of Core Depth (m) : 152.50
Sect: 1 Top of Section Depth(m): 152.50
LITHOLOGY: PLAG PHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCES 1A (0-25), 1B (25-28), 1C (28-30), 2A (33-62),
2B (62-91), 2C (91-98), 2D (98-112), 2E (112-125),
2F (125-130), 2G (130-150);
Texture : PHYRIC,APHANITIC,INTERVALS 23-34+90-132CM ARE VERY
GLASSY,ALT.GLAS RIMS OF ROUNDED PILLOW EDGES ARE
RECOGNIZEABLE IN PCES 2C-2G;
Structure : PILLOW BASALT,HIGHLY FRACTURED;
Alteration : FRESH
INTERVALS 0-18+35-89+132-150CM;
MOD TO EXT
INTERVALS 18-35+89-132CM;
Comments : BLUISH-GRAY BASALT,90-132CM REDDISH-BROWN(5YR 4/4),
INTERVAL 18-35 BROWN COLOR(7.5YR 5/6);
Vesicles : Size(mm): <1 Percent:
Location: Filling: CALCITE,CLAY.MIN
Shape : ROUND
ROUND & SMALL VESICLES FILLED WITH CLAY.MINS &
CALCITE;
Phenocrysts: PLAGIOCLASE
Size(mm): TO 3
PLAG PHENOS ARE MOSTLY 1MM IN SIZE & RANGE FROM
EUHEDRAL TO SUBHEDRAL;
Replacement: CALCITE
CLAY MINERALS
CALCITE & CLAY.MINS FILL VESICLES,YELLOW CLAY.MIN
VISIBLE IN PCE 1C;
UNIDENTIFIED
Minerals Replaced: GLASS
ALT.GLAS RIMS OF ROUNDED PILLOW EDGES IN INTERVAL
90-132CM;
Leg : 80 Top/Bottom Interval(mm): 0/ 400 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 154.40
Core: 9 Top of Core Depth (m) : 152.50
Sect: 2 Top of Section Depth(m): 154.00
LITHOLOGY: APHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCES 1A (3-23), 1B (23-32), 2A (34-40);
Texture : APHYRIC;
Structure : PILLOW BASALT,FRACTURED,FISSURES FILLED WITH WHITE
CALCITE;
Alteration : FRESH
Comments : BASALT IS REDDISH(5YR 5/4) ALTERED WITH A GREENISH
PCE IN THE CENTER OF THE RED(2.5Y 4/4) IN PCE 1A,
PCE 1B IS REDDISH WITH A GREENISH CORE SIMILAR TO
PCE 1A,HALF OF PCE 2A IS LIMESTONE & THE OTHER HALF
IS BASALT(7.5Y 5/6);
Vesicles :
Location: Filling: UNIDENT.MIN
WHITE UNIDENT.MIN FILLS VESICLES IN PCES 1A+2A;
Replacement: CALCITE
WHITE CALCITE FILLS FRACTURES;
UNIDENTIFIED
WHITE UNIDENT.MIN FILLS VESICLES;
Leg : 80 Top/Bottom Interval(mm): 400/ 460 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 154.46
Core: 9 Top of Core Depth (m) : 152.50
Sect: 2 Top of Section Depth(m): 154.40
LITHOLOGY: SEDIMENT;
LIMESTONE;
Piece No. : PCE 2B (40-46);
Leg : 80 Top/Bottom Interval(mm): 460/1500 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 155.50
Core: 9 Top of Core Depth (m) : 152.50
Sect: 2 Top of Section Depth(m): 154.46
LITHOLOGY: APHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCES 2C (46-67), 2D (67-98), 2E (98-134),
2F (134-146);
Texture : APHYRIC;
Structure : PILLOW BASALT,FRACTURES FILLED WITH WHITE CALCITE;
Alteration : FRESH
PCE 2C IS OXIDIZED ON TOP;
Comments : BASALT IS GRAY(5YR 5/1) ON THE AVERAGE,COLOR VARIES
THROUGHOUT DUE TO ALTERATION(PCE 2C IS OXIDIZED ON
THE TOP & IS 57R 5/4 IN COLOR,PCE 2D IS 5YR 6/6 IN
SPOTS,PCE 2E VARIES FROM 2.5Y 6/0 TO 2.5YR 6/2,PCE
2F IS 2.5YR 6/2 IN COLOR GRADUALLY BECOMING
7.5YR 5/4;
Vesicles :
Location: Filling: CALCITE
WHITE CALCITE FILLS VESICLES;
Replacement: CALCITE
WHITE CALCITE FILLS FRACTURES & VESICLES;
Leg : 80 Top/Bottom Interval(mm): 0/1500 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 157.00
Core: 9 Top of Core Depth (m) : 152.50
Sect: 3 Top of Section Depth(m): 155.50
LITHOLOGY: SEDIMENT;
LIMESTONE;
Piece No. : PCES 1 (0-8), 3 (94-98);
Leg : 80 Top/Bottom Interval(mm): 0/1500 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 157.00
Core: 9 Top of Core Depth (m) : 152.50
Sect: 3 Top of Section Depth(m): 155.50
LITHOLOGY: APHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCES 2A (11-25), 2B (25-39), 2C (39-92),
4A (100-112), 4B (110-122), 4C (120-130),
4D (130-143), 4E (143-150);
Texture : APHYRIC,PCES 2A-2C ARE GLASSY & APHANITIC;
Structure : PILLOW BASALT,CALCITE VEINS,PINK LIMESTONE FILLS
GAPS OF PILLOWS;
Alteration : FRESH
INTERVAL 22-27CM,PCE 2C;
MOD TO EXT
INTERVALS 11-21+28-39CM,PCES 4A-4E;
Comments : BASALT IS BLUISH-GRAY WITH VARIATIONS IN COLOR DUE
TO ALTERATION(7.5YR 5/6 IN PCES 2A-2B+4A-4E,5YR 3/3
IN ALT.GLAS RIM OF PCES 4D+4E);
Vesicles : Size(mm): <1 Percent:
Location: Filling: CALCITE,CLAY.MIN
CLAY.MIN & WHITE CALCITE FILL VESICLES WHICH ARE
COMMON;
Phenocrysts: PLAGIOCLASE
Size(mm): 2
RARE PLAG PHENOS;
Replacement: CALCITE
CLAY MINERALS
CLAY.MIN & WHITE CALCITE FILL VESICLES,CALCITE
FILLS VEINS;
UNIDENTIFIED
Minerals Replaced: GLASS
UNIDENT.MIN REPLACES GLASS;
Leg : 80 Top/Bottom Interval(mm): 0/1500 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 158.50
Core: 9 Top of Core Depth (m) : 152.50
Sect: 4 Top of Section Depth(m): 157.00
LITHOLOGY: APHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCES 1A (3-52), 1B (52-82), 1C (82-95), 1D (95-117),
2 (121-149);
Texture : APHYRIC;
Structure : PILLOW BASALT,CALCITE-FILLED VEINS;
Alteration : OXIDIZED GLASS FRAGMENTS IN LOWER PART OF PCE 1C;
Comments : INTERVAL 3-9CM OF PCE 1A & LOWER PART OF PCE 1B THRU
UPPER PART OF PCE 1D & UPPER PART OF PCE 2 ARE ALL
5YR 5/3 IN COLOR,LOWER PART OF PCE 1D IS 5YR 5/1,
LOWER PART OF PCE 1C CONSISTS OF GLASS FRAGMENTS
(OXIDIZED) IN A CALCAREOUS MATRIX;
Vesicles :
Location: Filling: CALCITE
Replacement: CALCITE
CALCITE FILLS VESICLES & FRACTURES;
UNIDENTIFIED
Minerals Replaced: GLASS
OXIDIZED GLASS FRAGMENTS IN PCE 1C;
Leg : 80 Top/Bottom Interval(mm): 0/1350 Analyst: Loubere, P.
Hole: 551 Sample Midpoint (m) : 159.85
Core: 9 Top of Core Depth (m) : 152.50
Sect: 5 Top of Section Depth(m): 158.50
LITHOLOGY: APHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCES 1A (0-3), 1B (2-15), 2A (17-30), 2B (30-50),
3A (52-56), 3B (56-86), 4 (88-95), 5 (98-112),
6 (116-131);
Texture : APHYRIC;
Structure : PILLOW BASALT,CALCITE VEINS;
Comments : BASALT IS PREDOMINANTLY LIGHT BLUISH-GRAY(2.5Y 6/0)
WITH SOME RUSTY-RED-BROWN TO BROWN COLORING
CONCENTRATED AROUND VEINS & ALTERED MARGINS OF
PILLOWS(COLOR CHANGES ARE GRADATIONAL);
Vesicles :
Location: Filling: CALCITE
COMMON SMALL CALCITE-FILLED VESICLES,VESICLES
DECREASE IN ABUNDANCE DOWNCORE,SMALL(<1MM) HOLES
FOUND THROUGHOUT SECTION;
Phenocrysts: FELDSPAR
SCATTERED FELD PHENOS-ID UNCERTAIN(POSSIBLY OL);
Replacement: CALCITE
CALCITE-FILLED VEINS & VESICLES;
Leg : 80 Top/Bottom Interval(mm): 0/1500 Analyst: Loubere, P.
Hole: 551 Sample Midpoint (m) : 161.50
Core: 10 Top of Core Depth (m) : 160.00
Sect: 1 Top of Section Depth(m): 160.00
LITHOLOGY: FELD PHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCES 1A (0-7), 1B (7-19), 1C (18-27), 1D (27-31),
1E (31-35), 1F (35-38), 2A (41-59), 2B (59-65),
2C (65-73), 2D (72-86), 2E (85-98), 2F (99-114),
2G (114-130), 3A (133-136), 3B (136-143),
3C (143-150);
Texture : PHYRIC,FINE-GRAINED BASALT MARGIN AT PCE 1D;
Structure : PILLOW BASALT,CALCITE VEINS ABUNDANT;
Alteration : REDDISH-BROWN ALTERATION ZONE SURROUNDS LARGER
VEINS;
Comments : BASALT IS A MIXTURE OF LIGHTER BLUE-GRAY & RUSTY-
BROWN COLORS,FINE-GRAINED MARGIN IS OLIVE COLORED;
Vesicles :
Location: Filling: CALCITE
SMALL VESICLES FILLED WITH CALCITE BECOME LESS
ABUNDANT DOWNCORE;
Phenocrysts: FELDSPAR
Size(mm): TO 1
PHENOS DECREASE DOWNCORE;
Replacement: CALCITE
CALCITE-FILLED VESICLES & VEINS;
Leg : 80 Top/Bottom Interval(mm): 0/1500 Analyst: Loubere, P.
Hole: 551 Sample Midpoint (m) : 163.00
Core: 10 Top of Core Depth (m) : 160.00
Sect: 2 Top of Section Depth(m): 161.50
LITHOLOGY: PLAG PHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCES 1A (0-20), 1B (20-29), 1C (29-39), 1D (39-45),
2A (47-53), 2C (65-97), 2D (97-101), 2E (100-105),
2F (105-110), 2G (110-112), 2H (112-140),
2I (140-150);
Texture : PHYRIC;
Structure : PILLOW BASALT,ABUNDANT CALCITE-FILLED VEINS IN UPPER
PART OF SECTION & DECREASING DOWNCORE;
Comments : BASALT IS LIGHTER BLUE-GRAY TO RUSTY-BROWN,ROCK IS
GRAY(7.5YR 5/0) NEAR THE BASE OF THE SECTION;
Vesicles : Size(mm): TO 1 Percent:
Location: Filling: CALCITE,UNIDENT
SMALL VESICLES FILLED WITH CALCITE & DARKER-GREEN
UNIDENT.MINS,COMMON SMALL HOLES IN ROCK WHICH
INCREASE DOWNCORE;
Phenocrysts: PLAGIOCLASE
Size(mm): TO 1
PHENOS DECREASE DOWNCORE;
Replacement: CALCITE
UNIDENTIFIED
DARKER-GREEN UNIDENT.MINS & CALCITE FILL VESICLES,
CALCITE FILLS VEINS;
Leg : 80 Top/Bottom Interval(mm): 0/1500 Analyst: Loubere, P.
Hole: 551 Sample Midpoint (m) : 163.00
Core: 10 Top of Core Depth (m) : 160.00
Sect: 2 Top of Section Depth(m): 161.50
LITHOLOGY: SEDIMENT;
LIMESTONE;
Piece No. : PCE 2B (54-64);
Leg : 80 Top/Bottom Interval(mm): 0/1500 Analyst: Loubere, P.
Hole: 551 Sample Midpoint (m) : 164.50
Core: 10 Top of Core Depth (m) : 160.00
Sect: 3 Top of Section Depth(m): 163.00
LITHOLOGY: PLAG PHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCES 1A (0-18), 1B (18-35), 1C (35-44);
Texture : PHYRIC,FAIRLY COARSE-GRAINED;
Structure : PILLOW BASALT,COMMON CALCITE VEINS;
Alteration : FAINT RUSTY-BROWN COLOR ASSOCIATED WITH VEINS,PCE
1A IS MORE ALTERED THAN PCES 1B+1C;
Comments : MEDIUM-TO-DARK-GRAY BASALT;
Vesicles : Size(mm): TO 1 Percent:
Location: Filling: CALCITE
Phenocrysts: PLAGIOCLASE
Size(mm): TO 1
PHENOS SCATTERED THROUGHOUT;
Replacement: CALCITE
CALCITE-FILLED VEINS & VESICLES;
Leg : 80 Top/Bottom Interval(mm): 0/1500 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 170.50
Core: 11 Top of Core Depth (m) : 169.00
Sect: 1 Top of Section Depth(m): 169.00
LITHOLOGY: APHYRIC TO PLAG MOD PHYRIC;
PILLOW BASALT;
MASSIVE BASALT;
Piece No. : PCES 1A (1-10), 1B (9-24), 1C (24-36), 2 (37-46),
3A (38-88), 3B (87-125), 3C (122-136), 3D (136-146),
3E (145-149);
Texture : APHYRIC TO MOD PHYRIC,APHANITIC,PCE 1C IS GLASSY,
INTERVAL 35-100CM VITROPHYRIC BASALT,BASALT BECOMES
MORE GLASSY BETWEEN 110-149CM;
Structure : MASSIVE PILLOW BASALT,FAIRLY LARGE CALCITE VEIN AT
TOP OF PCE 1B,DISTINCTIVE HORIZONTAL CALCITE VEINS
IN PCE 1C,MINOR CALCITE VEINS DEVELOPING BELOW
110CM;
Alteration : FRESH
INTERVALS 0-34+65-115CM;
MOD TO EXT
INTERVALS 34-65+115-149CM,ALTERATION ALONG CRACKS;
Comments : BASALT IS GRAY(N5 WHEN DRY),INTERVAL 35-100CM IS
BROWNISH COLOR(7.5YR 5/4) DUE TO ALTERATION;
Vesicles : Size(mm): <1 Percent:
Location: Filling: CALCITE
SMALL CALCITE-FILLED VESICLES RECOGNIZEABLE IN
INTERVAL 65-100CM;
Phenocrysts: PLAGIOCLASE
PLAG PHENOS FAIRLY LARGE & ABUNDANT IN INTERVAL
65-100CM-RARE ELSEWHERE;
Replacement: CALCITE
CALCITE-FILLED VEINS & VESICLES;
UNIDENTIFIED
Minerals Replaced: GLASS
ALT.GLAS IN INTERVAL 35-149CM;
Leg : 80 Top/Bottom Interval(mm): 0/1500 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 172.00
Core: 11 Top of Core Depth (m) : 169.00
Sect: 2 Top of Section Depth(m): 170.50
LITHOLOGY: APHYRIC TO PLAG MOD PHYRIC BASALT;
PILLOW BASALT;
MASSIVE BASALT;
Piece No. : PCES 1A (2-5), 1B (5-14), 1C (15-20), 1D (16-52),
1E (52-70), 1F (71-85), 2 (88-98), 3A (100-105),
3B (104-113), 4 (117-137), 5A (140-145),
5B (145-149);
Texture : APHYRIC TO MOD PHYRIC,APHANITIC,GLASSY,LOWER END OF
PCE 1F IS VERY GLASSY;
Structure : MASSIVE PILLOW BASALT,CALCITE-FILLED FRACTURES;
Alteration : FRESH
INTERVAL 2-82CM;
MOD TO EXT
INTERVAL 82-85CM;
EXT
PCES 2-5B,ALTERATION ALONG FRACTURE WALLS,ALT.GLAS
THROUGHOUT,GLASSY FRAGMENTS ALTERED TO GREENISH
CLAY.MINS;
Comments : FRESH BASALT IS GRAY,ALTERED GLASSY BASALT RANGES IN
COLOR FROM 7.5YR 5/6 TO 2.5YR 2/3,IN INTERVAL
87-150CM MIXTURE OF LIMESTONE & GLASSY BASALT
FRAGMENTS(VOLCANICLASTIC BRECCIA),PCES 2+4 CONSIST
OF MANY SMALL PCES(PCE 2 HAS 10 SMALL PCES IN
INTERVAL 88-92CM);
Vesicles :
Location: Filling: CALCITE
Phenocrysts: PLAGIOCLASE
Replacement: CALCITE
CALCITE-FILLED VESICLES & FRACTURES,LARGE CALCITE
EUHEDRAL XTLS ARE FOUND AT DRUSES;
CLAY MINERALS
Minerals Replaced: GLASS
GLASSY FRAGMENTS ALTERED TO GREENISH CLAY.MINS;
Leg : 80 Top/Bottom Interval(mm): 0/1500 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 173.50
Core: 11 Top of Core Depth (m) : 169.00
Sect: 3 Top of Section Depth(m): 172.00
LITHOLOGY: APHYRIC TO PLAG MOD PHYRIC BASALT;
PILLOW BASALT;
MASSIVE BASALT;
Piece No. : PCES 1 (2-12), 2A (14-19), 2B (19-21), 2C (22-29),
3A (31-33), 3B (34-37), 3C (38-43), 3D (44-48),
4 (49-61), 5A (63-66), 5B (65-75), 5C (75-84),
5D (858-89), 5E (90-100), 5F (101-107), 6 (108-116),
7A (117-125), 7B (126-133), 7C (134-148);
Texture : APHYRIC TO MOD PHYRIC BASALT,VERY GLASSY & PARTLY
VITROPHYRIC,PCES 5B-5E & PART OF 7A+7C APHANITIC;
Structure : MASSIVE PILLOW BASALT,CALCITE VEINS OF VARIOUS SIZES
THROUGHOUT-SOME WITH GLASSY BASALT FRAGMENTS WITHIN
THE VEIN;
Alteration : EXT
INTERVALS 2-70+95-118+125-136CM;
MOD TO EXT
INTERVALS 70-95+118-125+136-148CM,ALT.GLAS,SOME
GLASS FRAGMENTS ALTERED TO CLAY.MIN;
Comments : GRAY BASALT WITH ALTERATION AREAS RANGING IN COLOR
FROM 7.5YR 5/6 TO 2.5YR 3/2,VOLCANICLASTIC BRECCIA
ALSO EVIDENT,PCES 1+4+6 MADE UP OF MANY SMALL PCES;
Vesicles :
Location: Filling: CALCITE
VERY SMALL CALCITE-FILLED VESICLES;
Phenocrysts: PLAGIOCLASE
Replacement: CALCITE
CALCITE-FILLED VESICLES & FRACTURES;
CLAY MINERALS
GREEN CLAY.MINS REPLACE GLASSY BASALT;
Leg : 80 Top/Bottom Interval(mm): 0/ 600 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 174.10
Core: 11 Top of Core Depth (m) : 169.00
Sect: 4 Top of Section Depth(m): 173.50
LITHOLOGY: APHYRIC BASALT;
PILLOW BASALT;
MASSIVE BASALT;
Piece No. : PCES 1A (2-4), 1B (4-18), 1C (18-24), 2 (26-40),
3A (42-46), 3B (47-54), 3C (54-59);
Texture : APHYRIC,GLASSY BASALT(CHILLED LOWER MARGIN OF
PILLOW),ALT.GLAS FRAGMENTS IN VEINS;
Structure : MASSIVE PILLOW BASALT,CALCITE VEINS;
Alteration : MOD TO EXT
INTERVALS 2-4+20-24+55-59CM;
FRESH
INTERVAL 4-20CM;
EXT
INTERVAL 26-55CM,SOME BASALT REPLACED BY CLAY.MINS
AS WELL AS SOME GLASS;
Comments : BROWNISH BASALT(10YR 4/3 TO 10YR 7/1),SOME BASALT
IS DARK BROWN(23-60CM,7.5YR 4/4);
Vesicles :
Location: Filling: CALCITE
TINY CALCITE-FILLED VESICLES;
Replacement: CALCITE
CALCITE-FILLED VEINS & VESICLES;
CLAY MINERALS
Minerals Replaced: GLASS
GREENISH CLAY.MIN REPLACES GLASS & GLASSY BASALT;
Leg : 80 Top/Bottom Interval(mm): 600/1500 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 175.00
Core: 11 Top of Core Depth (m) : 169.00
Sect: 4 Top of Section Depth(m): 174.10
LITHOLOGY: PLAG PHYRIC BASALT;
PILLOW BASALT;
MASSIVE BASALT;
Piece No. : PCES 4A (61-108), 4B (108-116), 4C (115-145);
Texture : PHYRIC,VITROPHYRIC,APHANITIC;
Structure : MASSIVE PILLOW LAVA FLOW,CALCITE VEINS COMMON BUT
NOT FREQUENT;
Alteration : FRESH
INTERVALS 61-85+100-145CM;
MOD TO EXT
INTERVAL 85-100CM;
Comments : GRAY BASALT(N5) IN FRESHER AREAS,ALTERED REGIONS ARE
LIGHT BROWNISH-GRAY(2.5YR 6/2);
Vesicles :
Location: Filling: CALCITE,CLAY.MINS
COMMON CALCITE & CLAY.MIN-FILLED VESICLES-ID
CLAY.MIN UNCERTAIN(MAY BE SMEC);
Phenocrysts: PLAGIOCLASE
PHENOS MORE NUMEROUS NEAR BASE;
Replacement: CALCITE
CALCITE FILLS VEINS & VESICLES;
CLAY MINERALS
CLAY.MIN FILLS SOME VESICLES-ID UNCERTAIN(MAY BE
SMEC);
Leg : 80 Top/Bottom Interval(mm): 0/1500 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 176.50
Core: 11 Top of Core Depth (m) : 169.00
Sect: 5 Top of Section Depth(m): 175.00
LITHOLOGY: PLAG PHYRIC BASALT;
PILLOW BASALT;
MASSIVE BASALT;
Piece No. : PCES 1A (2-9), 1B (9-24), 1C (24-40), 1D (40-65),
1E (65-81), 1F (81-102), 1G (102-137), 2 (139-148);
Texture : PHYRIC,APHANITIC,PCES 1F-2 ARE FINE-GRAINED;
Structure : MASSIVE PILLOW LAVA FLOW,CALCITE VEINS FOUND BUT ARE
NOT COMMON IN PCES 1A-1E & ARE COMMON IN PCES 1F-2;
Alteration : FRESH
Comments : BASALT IS GRAY(N5) TO LIGHT BROWNISH-GRAY(2.5YR 6/2)
IN COLOR;
Vesicles :
Location: Filling: CALCITE,CLAY.MINS
CALCITE OR CLAY.MIN-FILLED VESICLES ARE FREQUENT &
SCATTERED THROUGHTOUT;
Phenocrysts: PLAGIOCLASE
Size(mm): 2-3
PLAG PHENO ABUNDANCE INCREASES TOWARD BASE OF
SECTION;
Replacement: CALCITE
CALCITE FILLS VEINS & SOME VESICLES;
CLAY MINERALS
CLAY.MINS FILL SOME VESICLES;
Leg : 80 Top/Bottom Interval(mm): 0/1450 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 177.95
Core: 11 Top of Core Depth (m) : 169.00
Sect: 6 Top of Section Depth(m): 176.50
LITHOLOGY: PLAG PHYRIC BASALT;
PILLOW BASALT;
MASSIVE BASALT;
Piece No. : PCES 1A (3-10), 1B (9-18), 1C (18-26), 2 (28-32),
3A (33-48), 3B (48-77), 3C (77-84), 3D (85-92),
3E (92-100), 3F (99-103), 4 (107-111), 5A (112-130),
5B (130-145);
Texture : PHYRIC,FINE-GRAINED OR GLASSY BASALT(VITROPHYRIC),
APHANITIC;
Structure : MASSIVE PILLOW BASALT,CALCITE VEINS;
Alteration : FRESH
INTERVALS 3-25+40-85+115-145CM;
MOD TO EXT
INTERVALS 25-40+85-100+112-115CM,BASALT ALTERED;
EXT
INTERVAL 107-110CM,BASALT ALTERED;
Comments : GRAY(N5) TO LIGHT BROWNISH-GRAY(2.5YR 6/2) BASALT,
BROWN ALTERED BASALT IN INTERVALS 25-40+85-116CM
(7.5YR 5/4),LIMSTONE BRECCIAS & GLASSY BASALT PCES
MAKE UP PCE 4,PCE 2 IS MADE UP OF 2 SMALL PCES;
Vesicles :
Location: Filling: CALCITE
Phenocrysts: PLAGIOCLASE ( 15%)
Size(mm): 1-3
PLAG PHENOS ARE EUHEDRAL TO SUBHEDRAL;
Replacement: CALCITE
CALCITE-FILLED VESICLES & VEINS;
UNIDENTIFIED
UNIDENT.MINS REPLACE GLASSY BASALT;
Leg : 80 Top/Bottom Interval(mm): 0/1350 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 179.35
Core: 11 Top of Core Depth (m) : 169.00
Sect: 7 Top of Section Depth(m): 178.00
LITHOLOGY: APHYRIC TO PLAG SPARSELY PHYRIC BASALT;
PILLOW BASALT;
MASSIVE BASALT;
Piece No. : PCES 1A (3-16), 1B (16-28), 1C (19-40), 2 (44-49),
3A (53-58), 3B (59-72), 4A (76-90), 4B (90-100),
4C (100-104), 4D (100-122), 4E (121-127),
4F (127-133);
Texture : APHYRIC TO SPARSELY PHYRIC,VITROPHYRIC TO APHANITIC,
TOP OF PCE 4A IS VERY GLASSY & CHANGES GRADUALLY TO
XTLLN;
Structure : MASSIVE PILLOW BASALT,CALCITE VEINS COMMON IN PCES
1A-2,CALCITE VEINS RARE IN PCES 4A-4F;
Alteration : FRESH
INTERVALS 3-16+54-70+75-133CM,PCES 4A-4F MAKE UP
THE FRESHEST SECTION;
MOD TO EXT
INTERVALS 16-40+53-54CM;
EXT
INTERVAL 43-48CM;
Comments : GRAY(N5) BASALT IN FRESHEST PART,BROWNISH BASALT IN
ALTERED AREAS(7.5YR 5/4),PCE 2 MADE UP OF MANY SMALL
PCES(FRAGMENTS OF ALTERED VITROPHYRIC BASALT WITH
CALCITE VEINS);
Vesicles :
Location: Filling: CALCITE,CLAY.MINS
SMALL FILLED VESICLES COMMON,VESICLES FILLED WITH
CLAY.MIN IN PCES 4A-4F;
Phenocrysts: PLAGIOCLASE
Replacement: CALCITE
CALCITE-FILLED VESICLES & VEINS;
CLAY MINERALS
CLAY.MINS FILL SOME VESICLES IN PCES 4A-4F;
Leg : 80 Top/Bottom Interval(mm): 0/ 600 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 180.10
Core: 11 Top of Core Depth (m) : 169.00
Sect: 8 Top of Section Depth(m): 179.50
LITHOLOGY: APHYRIC TO PLAG SPARSELY PHYRIC BASALT;
PILLOW BASALT;
MASSIVE BASALT;
Piece No. : PCES 1 (2-20), 2A (24-32), 2B (32-38), 3 (41-47),
4 (50-59);
Texture : APHYRIC TO SPARSELY PHYRIC,APHANITIC;
Structure : MASSIVE PILLOW BASALT,CALCITE VEINS PRESENT;
Alteration : FRESH
Comments : GRAY(N5-N6) BASALT,PCE 3 CONSISTS OF MANY SMALL PCES
OF GRAY(5Y 6/1) BASALT;
Vesicles :
Location: Filling: CALCITE,CLAY.MIN
Shape : ROUND
SMALL FILLED ROUND VESICLES COMMON;
Phenocrysts: PLAGIOCLASE
Replacement: CALCITE
CALCITE-FILLED VESICLES & VEINS;
CLAY MINERALS
CLAY.MINS FILL SOME VESICLES;
Leg : 80 Top/Bottom Interval(mm): 0/1500 Analyst: Loubere, P.
Hole: 551 Sample Midpoint (m) : 179.50
Core: 12 Top of Core Depth (m) : 178.00
Sect: 1 Top of Section Depth(m): 178.00
LITHOLOGY: APHYRIC TO SPARSELY PLAG PHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCES 1 (3-8), 2 (10-21), 3A (24-44), 3B (44-59),
4A (61-72), 4B (72-83), 4C (83-85), 4D (85-98),
4E (99-100), 5A (103-113), 5B (113-121),
5C (120-148);
Texture : APHYRIC TO SPARSELY PHYRIC,PCES 1+4B+4D+5A+5B ARE
FINE-GRAINED,PCES 2+5C ARE COARSE-GRAINED,BASALT
FRAGMENTS IN CALCITE MARGIN IN PCE 4A;
Structure : PILLOW BASALT,SPARRY CALCITE VEIN ATTACHED TO
PCE 4C,CALCITE VEINS SCATTERED THROUGHOUT;
Alteration : MOD TO EXT
Comments : PCE 1 IS GRAY BASALT,PCE 2 IS RUST COLORED WITH THE
RUST COLORING INCREASING DOWNCORE,PCE 4D HAS DARK
BLUE-GREEN BASALT,LOWER PART OF PCE 5C(138-148CM) IS
GRAY BASALT,PCES 5A+5B SHOW SWIRLS & GRADATION BANDS
OF FAINT RUSTY BROWN,PCE 4D VOLCANICLASTIC BRECCIA;
Vesicles :
Location: Filling: CALCITE,UNIDENT
CALCITE & DARK GREEN UNIDENT.MIN-FILLED VESICLES;
Phenocrysts: PLAGIOCLASE
Replacement: CALCITE
CALCITE FILLS VESICLES & VEINS;
UNIDENTIFIED
DARK GREEN UNIDENT.MIN FILLS SOME VESICLES;
Leg : 80 Top/Bottom Interval(mm): 0/ 950 Analyst: Loubere, P.
Hole: 551 Sample Midpoint (m) : 180.45
Core: 12 Top of Core Depth (m) : 178.00
Sect: 2 Top of Section Depth(m): 179.50
LITHOLOGY: APHYRIC TO SPARSELY PLAG PHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCES 1A (3-7), 1B (6-21), 1C (21-25), 1D (25-35),
1E (34-40), 1F (39-54), 2A (56-67), 2B (67-92);
Texture : APHYRIC TO SPARSELY PHYRIC;
Structure : PILLOW LAVA,CALCITE FILLS FRACTURES;
Alteration : FRESH
PCE 1A-1F(BECOMES OXIDIZED TOWARD PCE 1F);
SLIGHTLY
PCES 2A-2B;
Comments : PCES 1A-1F 2.5YR 3/0,PCES 2A-2B 2.5Y 3/2;
Vesicles :
Location: Filling: CALCITE
CALCITE FILLS VESICLES;
Phenocrysts: PLAGIOCLASE
Replacement: CALCITE
CALCITE FILLS VESICLES & VEINS;
SULFIDES
ID UNCERTAIN-POSSIBLY GALENA &/OR SPHELENITE(?);
Leg : 80 Top/Bottom Interval(mm): 950/1250 Analyst: Loubere, P.
Hole: 551 Sample Midpoint (m) : 180.75
Core: 12 Top of Core Depth (m) : 178.00
Sect: 2 Top of Section Depth(m): 180.45
LITHOLOGY: SEDIMENT;
PELITIC ROCK;
Piece No. : PCES 3A (96-107), 3B (107-122);
Leg : 80 Top/Bottom Interval(mm): 1250/1350 Analyst: Loubere, P.
Hole: 551 Sample Midpoint (m) : 180.85
Core: 12 Top of Core Depth (m) : 178.00
Sect: 2 Top of Section Depth(m): 180.75
LITHOLOGY: SEDIMENT;
LIMESTONE;
Piece No. : PCES 4A (126-132), 4B (133-135);
Leg : 80 Top/Bottom Interval(mm): 0/1450 Analyst: Loubere, P.
Hole: 551 Sample Midpoint (m) : 182.45
Core: 12 Top of Core Depth (m) : 178.00
Sect: 3 Top of Section Depth(m): 181.00
LITHOLOGY: PLAG MOD PHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCES 1 (3-22), 2A (25-36), 2B (37-51), 3A (55-64),
3B (64-77), 4A (80-112), 4B (111-135), 4C (134-141);
Texture : MOD PHYRIC,FINE-TO-MEDIUM-GRAINED;
Structure : PILLOW BASALT,SCATTERED CALCITE VEINS,RADIAL CALCITE
VEINS IN PCE 4C;
Alteration : RUSTY BROWN AREAS NEAR VEINS,SECTION BECOMES
INCREASINGLY ALTERED DOWNCORE;
Comments : PURPLISH-TO-GRAY BASALT(DEPENDING UPON EXTENT OF
ALTERATION);
Vesicles : Size(mm): 1-2 Percent:
Location: Filling: CALCITE,UNIDENT
SMALL CALCITE-FILLED VESICLES COMMON IN PCE 1,
SCATTERED VESICLES THROUGHOUT FILLED WITH WHITE OR
DARK GREEN UNIDENT.MINS(POSSIBLY CALCITE &/OR
SMEC);
Phenocrysts: PLAGIOCLASE
Replacement: CALCITE
CALCITE-FILLED VESICLES & VEINS;
UNIDENTIFIED
WHITE &/OR DARK GREEN UNIDENT.MINS FILL VESICLES
(POSSIBLY CALCITE &/OR SMEC);
Leg : 80 Top/Bottom Interval(mm): 0/1450 Analyst: Loubere, P.
Hole: 551 Sample Midpoint (m) : 183.95
Core: 12 Top of Core Depth (m) : 178.00
Sect: 4 Top of Section Depth(m): 182.50
LITHOLOGY: PLAG MOD PHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCES 1A (4-23), 1B (25-30), 2B (38-52), 2C (53-55),
2D (55-60), 2E (59-86), 2F (80-91), 2G (91-94),
2H (94-117), 2I (111-119), 2J (120-124),
2K (122-142);
Texture : MOD PHYRIC;
Structure : PILLOW BASALT,CALCITE-FILLED FRACTURES,PCES 2C+2D
SCORIA;
Alteration : SLIGHTLY
PCES 1A-2D;
FRESH
PCES 2E-2K;
Comments : PCES 1A+1B 2.5YR 3/2 WITH A CORE OF 2.5YR 3/0,PCE 2B
REDDISH & YELLOWISH-GRAY COLOR(7.5YR 6/4 &
2.5YR 6/40),PCES 2C-2K ARE DARK GRAY TO BLACK
(2.5Y 2/0);
Vesicles : PCES 1A-1B HAVE VESICLES PARALLEL TO PILLOW LAVA
STRUCTURE,PCES 2C-2D HAVE MOSTLY EMPTY VESICLES;
Phenocrysts: PLAGIOCLASE
Replacement: CALCITE
CALCITE FILLS PCE 2E;
Leg : 80 Top/Bottom Interval(mm): 0/1450 Analyst: Loubere, P.
Hole: 551 Sample Midpoint (m) : 183.95
Core: 12 Top of Core Depth (m) : 178.00
Sect: 4 Top of Section Depth(m): 182.50
LITHOLOGY: SEDIMENT;
ARGILLACEOUS ROCK;
Piece No. : PCE 2A (34-37);
Leg : 80 Top/Bottom Interval(mm): 0/1450 Analyst: Loubere, P.
Hole: 551 Sample Midpoint (m) : 185.45
Core: 12 Top of Core Depth (m) : 178.00
Sect: 5 Top of Section Depth(m): 184.00
LITHOLOGY: APHYRIC TO PLAG SPARSELY PHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCES 1A (0-25), 1B (23-34), 1C (35-57), 1D (57-62),
1E (62-81), 2 (84-109), 3 (112-120), 4 (120-150);
Texture : APHYRIC TO SPARSELY PHYRIC,COARSE-GRAINED;
Structure : PILLOW BASALT,SCATTERED CALCITE VEINS;
Alteration : FRESH TO MOD
ALTERATION INCREASES DOWNCORE;
Comments : FRESH BASALT IS MEDIUM GRAY,PCE 1D DULL GRAY WITH
REDDISH TINGE,PCES 1E-4 PURPLISH-GRAY WITH RUSTY
TINGE;
Vesicles :
Location: Filling: CALCITE,UNIDENT
COMMON SMALL WHITE & DARK GREEN VESICLES(EITHER
CALCITE OR SMEC-FILLED);
Phenocrysts: PLAGIOCLASE
Replacement: CALCITE
CALCITE FILLS VESICLES & VEINS;
UNIDENTIFIED
DARK GREEN UNIDENT.MINS FILL SOME VESICLES-
POSSIBLY SMEC;
Leg : 80 Top/Bottom Interval(mm): 0/ 500 Analyst: Loubere, P.
Hole: 551 Sample Midpoint (m) : 186.00
Core: 12 Top of Core Depth (m) : 178.00
Sect: 6 Top of Section Depth(m): 185.50
LITHOLOGY: APHYRIC TO PLAG SPARSELY PHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCES 1A (0-26), 1B (25-33), 1C (33-49);
Texture : APHYRIC TO PLAG SPARSELY PHYRIC;
Structure : PILLOW BASALT,CALCITE-FILLED VEINS;
Alteration : SLIGHTLY
ALTERATION DISCOLORATION THROUGHOUT;
Comments : BASALT IS DARK GRAY ALTERED TO YELLOWISH-GRAY &
REDDISH-GRAY IN PLACES,PCE 1C IS 2.5YR 3/2 IN COLOR;
Vesicles :
Location: Filling: CALCITE
Phenocrysts: PLAGIOCLASE
Replacement: CALCITE
CALCITE FILLS VESICLES & VEINS;
Leg : 80 Top/Bottom Interval(mm): 0/1500 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 189.50
Core: 13 Top of Core Depth (m) : 188.00
Sect: 1 Top of Section Depth(m): 188.00
LITHOLOGY: APHYRIC TO PLAG SPARSELY PHYRIC BASALT;
MASSIVE LAVA FLOWS;
Piece No. : PCES 1A (0-16), 1B (16-28), 1C (28-42), 1D (42-54),
1E (53-76), 1F (76-82), 1G (82-96), 1H (96-115),
1I (111-123), 1J (123-137), 1K (137-143),
1L (143-150);
Texture : APHYRIC TO SPARSELY PHYRIC,APHANITIC,GLASSY,PCES
1G-1L ARE XTLLN;
Structure : MASSIVE LAVA FLOWS,CALCITE & CLAY.MIN VEINS COMMON;
Alteration : FRESH TO SLIGHTLY
Comments : GRAY(5Y 6/1 TO N4) BASALT;
Vesicles : Size(mm): TO 1 Percent:
Location: Filling: CALCITE,CLAY.MIN
VESICLES FILLED WITH CALCITE OR GREENISH-BROWN
CLAY.MINS;
Phenocrysts: PLAGIOCLASE
Size(mm): 2-3
PLAG PHENOS RANGE FROM SUBHEDRAL TO EUHEDRAL;
Replacement: CALCITE
CALCITE FILLS VESICLES & VEINS;
CLAY MINERALS
GREENISH-BROWN CLAY.MINS FILL SOME VESICLES;
Leg : 80 Top/Bottom Interval(mm): 0/1500 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 191.00
Core: 13 Top of Core Depth (m) : 188.00
Sect: 2 Top of Section Depth(m): 189.50
LITHOLOGY: APHYRIC TO PLAG SPARSELY PHYRIC BASALT;
MASSIVE LAVA FLOWS;
Piece No. : PCES 1A (1-11), 1B (11-21), 1C (22-30), 1D (29-31),
2A (34-43), 2B (43-60), 2C (43-61), 2D (61-65),
2E (63-71), 3A (74-76), 3B (73-85), 3C (85-86),
3D (87-100), 3E (100-110), 3F (110-116),
3G (112-130), 3H (128-140), 3I (139-150);
Texture : APHYRIC TO SPARSELY PHYRIC BASALT;
Structure : MASSIVE LAVA FLOWS,CALCITE VEINS COMMON;
Alteration : FRESH TO SLIGHTLY
ALTERATION ZONES(OXIDATION) ALONG VEINS,PCES
2A-2E FRESHER THAN REST OF SECTION;
Comments : PCES 1A-1D 2.5Y 4/0 TO 2.5Y 3/0 WHEN WET,ALTERATION
ZONES ALONG VEINS IS 2.5Y 5/3 TO 2.5Y 5/4,PCES
2A-2E 2.5Y 4/0,PCES 3A-3I 2.5Y 5/0 WITH OXIDATION
ZONES ALONG VEINS GRAY-YELLOW(2.5Y 6/2) TO DARK
GREEN(5G 3/2) IN PLACES;
Vesicles :
Location: Filling: CALCITE
VESICLES FILLED WITH CALCITE THROUGHOUT;
Phenocrysts: PLAGIOCLASE
Size(mm): 2-3
Replacement: CALCITE
CALCITE FILLS VESICLES & VEINS;
Leg : 80 Top/Bottom Interval(mm): 0/ 80 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 191.08
Core: 13 Top of Core Depth (m) : 188.00
Sect: 3 Top of Section Depth(m): 191.00
LITHOLOGY: APHYRIC TO PLAG SPARSELY PHYRIC BASALT;
MASSIVE LAVA FLOWS;
Piece No. : PCE 1 (1-8);
Texture : APHYRIC TO SPARSELY PHYRIC,VITROPHYRIC,LOWER END OF
PCE IS VERY GLASSY;
Structure : MASSIVE LAVA FLOWS,CALCITE VEINS;
Alteration : FRESH
Comments : LIGHT BROWNISH-GRAY(10YR 6/2) BASALT,LOWER END IS
DARK BROWN(7.5YR 4/4);
Vesicles :
Location: Filling: CALCITE
VESICLES FILLED WITH CALCITE;
Phenocrysts: PLAGIOCLASE
Size(mm): 2-3
Replacement: CALCITE
CALCITE FILLS VESICLES & VEINS;
Leg : 80 Top/Bottom Interval(mm): 80/1500 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 192.50
Core: 13 Top of Core Depth (m) : 188.00
Sect: 3 Top of Section Depth(m): 191.08
LITHOLOGY: VOLCANICLASTIC BRECCIA;
Piece No. : PCES 2A (11-15), 2B (13-17), 2C (18-21), 3A (25-28),
3B (28-33), 3C (34-38), 3D (38-40), 4 (44-46),
5A (55-60), 5B (62-65), 6 (69-75), 7 (78-88),
8 (92-102), 9 (107-117), 10A (120-127),
10B (127-131), 11A (135-139), 11B (139-144),
12 (147-150);
Comments : VERY GLASSY BASALT BRECCIA IN A MATRIX OF WHITE
CALCITE,GLASSY FRAGMENTS ARE DARK BROWN(7.5YR 4/4)
IN COLOR,MOST OF TINY FRAGMENTS ARE OLIVE(5Y 5/4)
COLORED,CALCITE-FILLED VESICLES IN BASALT FRAGMENTS,
FAIRLY LARGE FISSURES OR GAPS THROUGHOUT,WALLS OF
FISSURES ARE VERY DARK BROWN IN COLOR(7.5YR 3/2),ALL
BASALT IS ALTERED;
Vesicles :
Location: Filling: CALCITE
VESICLES FILLED WITH CALCITE;
Replacement: CALCITE
CALCITE-FILLED VEINS & VESICLES,CALCITE CEMENTS
MATRIX;
Leg : 80 Top/Bottom Interval(mm): 0/1000 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 193.50
Core: 13 Top of Core Depth (m) : 188.00
Sect: 4 Top of Section Depth(m): 192.50
LITHOLOGY: VOLCANICLASTIC BRECCIA;
Piece No. : PCES 1A (0-7), 1B (7-17), 1C (17-24), 2A (28-40),
2B (40-46), 3A (49-52), 3B (53-55), 3C (57-60),
4 (64-80), 5A (84-92), 5B (91-99);
Comments : VOLCANICLASTIC BRECCIA,PCES 1A-1C REDDISH-YELLOW
(7.5YR 5/4) & IN PLACES IS BROWNISH(7.5YR 3/2 TO
7.5YR 5/2) DUE TO PRESENCE OF NON-OXIDES,PCE 1B
CONTAINS A FE.OXIDE NODULE-LIKE FEATURE OF APPROX
5CM IN DIAMETER SURROUNDED BY CALCITE CONCENTRICALLY
-ARRANGED VEINLETS,PCES 2A-3C ARE ALTERED BASALT
WITH FE.OXIDE ALTERATION(7.5YR 3/2 TO 7.5YR 5/2) &
HAVE CALCITE-FILLED VEINS,PCE 4 IS RUBBLE MADE UP OF
ALTERED BASALT(MORE SO THAN PREVIOUSLY) EXHIBITING
THE SAME TYPE OF FE.OXIDE AS WELL AS GREENISH &/OR
OLIVE-COLORED(5Y 5/4) CLAY.MINS,PCES 5A-5B ARE
BASALT PCES 10YR 5/1 IN COLOR & 10YR 6/6 IN PLACES
WITH VERY THIN CALCITE VEINLETS THROUGHOUT;
Vesicles :
Location: Filling: CALCITE
VESICLES IN PCES 5A-5B ARE LARGER THAN IN THE REST
OF THE SECTION;
Replacement: CALCITE
FILLS VESICLES & VEINLETS;
CLAY MINERALS
GREENISH &/OR OLIVE CLAY.MINS REPLACE BASALT IN
SOME AREAS;
Leg : 80 Top/Bottom Interval(mm): 980/1500 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 194.00
Core: 13 Top of Core Depth (m) : 188.00
Sect: 4 Top of Section Depth(m): 193.48
LITHOLOGY: PLAG MOD PHYRIC BASALT;
MASSIVE LAVA FLOW;
Piece No. : PCES 5C (98-105), 5D (106-117), 5E (117-129),
5F (129-133), 6 (137-150);
Texture : MOD PHYRIC;
Structure : MASSIVE LAVA FLOW,CALCITE-FILLED VEINS;
Alteration : FRESH TO SLIGHTLY
SLIGHT ALTERATION ALONG VEINS,CORE BECOMES FRESHER
TOWARDS THE BASE OF SECTION;
Comments : PCE 5C IS 10YR 5/1,PCE 5D IS 2.5Y 5/0,PCES 5E-5F ARE
BLACK TO DARK GRAY(2.5Y 3/0),PCE 6 IS RUBBLE &
RESEMBLES PCES 5E+5F;
Vesicles :
Location: Filling: CALCITE
MANY CALCITE-FILLED VESICLES AT THE LOWER PARTS OF
PCES 5C+5F & THROUGHTOUT PCE 6,VESICLES IN PCE 5C
ARE LARGER THAN IN THE OTHER PCES;
Replacement: CALCITE
FILLS VESICLES & VEINLETS;
Leg : 80 Top/Bottom Interval(mm): 0/1500 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 195.50
Core: 13 Top of Core Depth (m) : 188.00
Sect: 5 Top of Section Depth(m): 194.00
LITHOLOGY: PLAG MOD PHYRIC BASALT;
MASSIVE LAVA FLOWS;
Piece No. : PCES 1A (1-3), 1B (3-7), 1C (5-14), 1D (13-25),
1E (27-50), 1F (39-58), 1G (57-71), 1H (71-87),
1I (87-93), 1J (93-95), 1K (95-97), 1L (98-108),
1M (108-115), 1N (115-120), 1O (120-131),
1P (130-143), 2 (146-150);
Texture : MOD PHYRIC,INTERVAL 42-150CM XTLLN & FINE-GRAINED;
Structure : MASSIVE LAVA FLOWS,RARE CALCITE VEINS;
Alteration : FRESH
Comments : DARK TO VERY DARK GRAY BASALT(N3 TO N4);
Vesicles : Size(mm): 1-4 Percent:
Location: Filling: CALCITE,CLAY.MINS
INTERVAL 0-42CM VESICLES ARE FILLED WITH CALCITE
& DARK GREEN CLAY.MINS;
Size(mm): Percent: 0
INTERVAL 42-150CM IS NON-VESICULAR;
Phenocrysts: PLAGIOCLASE
Size(mm): TO 3
PLAG PHENOS ARE EUHEDRAL TO SUBHEDRAL;
Replacement: CALCITE
CALCITE FILLS VESICLES & RARE VEINS IN INTERVAL
0-42CM;
Leg : 80 Top/Bottom Interval(mm): 0/1500 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 197.00
Core: 13 Top of Core Depth (m) : 188.00
Sect: 6 Top of Section Depth(m): 195.50
LITHOLOGY: PLAG MOD PHYRIC BASALT;
MASSIVE LAVA FLOW;
Piece No. : PCES 1A (0-6), 1B (5-16), 1C (16-24), 1D (25-36),
1E (36-38), 1F (38-41), 2 (43-50), 3 (53-56),
4A (59-63), 4B (62-71), 4C (70-79), 4D (79-81),
4E (81-86), 4F (85-91), 4G (92-98), 4H (97-109),
4I (109-119), 4J (119-126), 4K (126-140),
4L (140-149);
Texture : MOD PHYRIC,APHANITIC,MICROXTLLN;
Structure : MASSIVE LAVA FLOW,MANY LARGE CALCITE VEINS RUNNING
ALMOST VERTICALLY THROUGHOUT SECTION,A LARGE CALCITE
VEIN RUNS FROM PCE 4A TO PCE 4F WHERE IT SPLITS &
CONTINUES TO THE BOTTOM OF THE SECTION,THE WIDTH OF
THE VEINS VARY FROM 1-5MM;
Alteration : FRESH TO SLIGHTLY
SOME ALTERATION ALONG VEIN WALLS;
Comments : PCES 1A-1F 2.5Y 3/0,PCES 2-4L ARE OLIVE GRAY
(5Y 5/2);
Vesicles : VERY SMALL RARE VESICLES IN PCES 4A-4F;
Phenocrysts: PLAGIOCLASE
Size(mm): TO 3
PLAG PHENOS ARE EUHEDRAL TO SUBHEDRAL;
Replacement: CALCITE
CALCITE FILLS VEINS;
Leg : 80 Top/Bottom Interval(mm): 0/ 350 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 197.35
Core: 13 Top of Core Depth (m) : 188.00
Sect: 7 Top of Section Depth(m): 197.00
LITHOLOGY: PLAG MOD PHYRIC BASALT;
MASSIVE LAVA FLOW;
Piece No. : PCES 1 (0-10), 2 (14-24), 3A (28-32), 3B (32-35);
Texture : MOD PHYRIC,PCE 1 IS XTLLN,PCES 2+3B FINE-GRAINED,
PCE 3A IS VITROPHYRIC;
Structure : MASSIVE LAVA FLOW,CALCITE & CLAY.MIN-FILLED VEINS IN
PCE 1,PCE 3A HAS CLAY.MIN-FILLED VEINS,PCE 3B HAS
CALCITE-FILLED VEINS;
Alteration : FRESH
Comments : PCE 1 IS DARK GRAY BASALT(N3-N4),PCE 2 IS DARK GRAY
BASALT(N3),PCES 3A-3B ARE GRAY BASALT(5Y 6/1);
Vesicles :
Location: Filling: CLAY.MIN
PCE 3B HAS CLAY.MIN-FILLED VESICLES;
Phenocrysts: PLAGIOCLASE ( TO 5%)
Size(mm): TO 3
PLAG PHENOS ARE EUHEDRAL TO SUBHEDRAL;
Replacement: CALCITE
CLAY MINERALS
CALCITE & CLAY.MINS FILL VEINS,VESICLES IN PCE 3B
FILLED WITH CLAY.MINS;
Leg : 80 Top/Bottom Interval(mm): 0/1500 Analyst: Otsuka, K.
Hole: 551 Sample Midpoint (m) : 199.00
Core: 14 Top of Core Depth (m) : 197.50
Sect: 1 Top of Section Depth(m): 197.50
LITHOLOGY: PLAG-OL MOD PHYRIC BASALT;
MASSIVE LAVA FLOW;
Piece No. : PCES 1A (0-20), 1B (20-28), 1C (29-63), 1D (64-87),
1E (88-93), 1F (95-150);
Texture : MOD PHYRIC;
Structure : MASSIVE LAVA FLOW,UNIDENT.MIN & CALCITE-FILLED VEINS
COMMON THROUGHOUT,LARGE WHITE BLEBS(CALCITE?) &
SMALL BLACK ONES IN PCE 1D;
Alteration : FRESH TO SLIGHTLY
BROWN WEATHERING RIM AROUND TOP OF PCE 1D,BASALT
WEATHERED IN INTERVALS 94-105+109-119+123-130CM;
Comments : BASALT IS GRAY(N3) THROUGHOUT;
Vesicles : Size(mm): Percent: 0
PCES 1A-1C;
Location: Filling: CALCITE,SMEC
PCES 1D-1F ARE VESICULAR WITH VESICLES FILLED
WITH CALCITE &/OR SMEC-ID SMEC UNCERTAIN;
Phenocrysts: PLAGIOCLASE ( <10%)
Size(mm): 1-4
OLIVINE ( RARE%)
BLACK/WHITE PHENOS;
Replacement: CALCITE
CALCITE VEINS & BLEBS-ID CALCITE BLEBS UNCERTAIN;
UNIDENTIFIED
GREEN UNIDENT.MIN FILLS VEINS IN PCE 1B;
SMECTITE
SMEC FILLS SOME VESICLES-ID SMEC UNCERTAIN;
Leg : 80 Top/Bottom Interval(mm): 0/ 200 Analyst: Masson, D.G.
Hole: 551 Sample Midpoint (m) : 199.20
Core: 14 Top of Core Depth (m) : 197.50
Sect: 2 Top of Section Depth(m): 199.00
LITHOLOGY: PLAG-OL MOD PHYRIC BASALT;
MASSIVE LAVA FLOW;
Piece No. : PCES 1 (2-12), 2 (14-18);
Texture : MOD PHYRIC;
Structure : MASSIVE LAVA FLOW,EXTENSIVELY VEINED;
Comments : GRAY BASALT;
Vesicles : PRESENCE OF VESICLES UNCERTAIN;
Phenocrysts: PLAGIOCLASE
OLIVINE
PRESENCE OF WHITE & DARK PHENOS;
Leg : 80 Top/Bottom Interval(mm): 200/ 500 Analyst: Masson, D.G.
Hole: 551 Sample Midpoint (m) : 199.50
Core: 14 Top of Core Depth (m) : 197.50
Sect: 2 Top of Section Depth(m): 199.20
LITHOLOGY: SEDIMENT;
MUDSTONE;
Piece No. : PCES 3A (20-34), 3B (35-50);
Leg : 80 Top/Bottom Interval(mm): 500/1500 Analyst: Masson, D.G.
Hole: 551 Sample Midpoint (m) : 200.50
Core: 14 Top of Core Depth (m) : 197.50
Sect: 2 Top of Section Depth(m): 199.50
LITHOLOGY: VOLCANICLASTIC BRECCIA;
Piece No. : PCES 4 (53-56), 5 (60-62), 6 (65-70), 7 (73-78),
8 (80-82), 9 (85-88), 10 (91-98), 11 (100-106),
12 (108-110), 13 (114-116), 14 (118-123),
15 (125-128), 16 (130-133), 17 (136-140),
18 (144-149);
Comments : CONTAINS LARGE ANGULAR CLASTS OF MASSIVE INDURATED
OLIVE BROWN SEDIMENT WITH THE MATRIX COMPRISED OF
MUCH SMALLER GREEN CLASTS(USUALLY ROUNDED-ALTERED
VOLCANIC MATERIAL?) WITHIN OTHER GREEN MATERIAL
WHICH IS VEINED WITH PINK SEDIMENT;
Leg : 80 Top/Bottom Interval(mm): 0/1250 Analyst: Masson, D.G.
Hole: 551 Sample Midpoint (m) : 201.75
Core: 14 Top of Core Depth (m) : 197.50
Sect: 3 Top of Section Depth(m): 200.50
LITHOLOGY: VOLCANICLASTIC BRECCIA;
Piece No. : PCES 1 (3-6), 2 (10-12), 3 (15-21), 4 (25-29),
5 (32-43), 6 (46-48), 7 (52-56), 8 (59-63),
9 (66-73), 10 (76-100), 11 (103-112), 12 (115-123);
Comments : PCES 1-2 SIMILAR TO INTERVAL 50-150CM IN CORE 14-2,
REST OF SECTION MADE UP OF SEDIMENTARY OR VOLCANIC
BRECCIA,LARGE ANGULAR OR ROUNDED CLASTS OF MASSIVE
LIGHT GRAY TO GRAY SEDIMENT;
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