Leg : 88 Top/Bottom Interval(mm): 0/ 40 Analyst: Natland, J.
Hole: 581B Sample Midpoint (m) : 3.65
Core: H 1 Top of Core Depth (m) : 0.00
Sect: CC Top of Section Depth(m): 3.71
LITHOLOGY: BASALT;
SEDIMENT (BIOSILICIOUS CLAY);
Piece No. : PCE NO PIECE NUMBERS ASSIGNED;
Texture : ONE PIECE IS A SEMI-ROUNDED COBBLE (DIAMETER 2CM);
Comments : BASALT IS MEDIUM GRAY, ONE PIECE IS SEDIMENT AND ONE
PIECE IS BASALT;
Leg : 88 Top/Bottom Interval(mm): 0/1500 Analyst: Natland, J.
Hole: 581B Sample Midpoint (m) : 62.50
Core: H 2 Top of Core Depth (m) : 61.00
Sect: 1 Top of Section Depth(m): 61.00
LITHOLOGY: BASALT;
SEDIMENT (CHERT);
Piece No. : PCE 3 (16-18), 6 (32-34);
Comments : PCES 3&6 ARE ONLY BASALT PIECES IN SECTION, PCE 6 IS
A PEBBLE, CORE H2 IS TOP OF CORE 1 WHICH WAS CALLED
CORE 1 TO GIVE THE BASALT A PROPER DEPTH;
Leg : 88 Top/Bottom Interval(mm): 0/1000 Analyst: Natland, J.
Hole: 581B Sample Midpoint (m) : 348.50
Core: 1 Top of Core Depth (m) : 347.50
Sect: 1 Top of Section Depth(m): 347.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1 (3-12), 2 (15-22), 3 (25-32), 4 (34-42),
5A (44-47), 5B (44-50), 5C (47-59), 6 (63-66),
7 (69-73), 8 (76-80), 9A (84-92), 9B (92-98);
Texture : APHYRIC, FINE-GRAINED, NO CHILLED RINDS RECOVERED;
Structure : SOME WIDE AND NARROW VEINS FILLED WITH BRICK RED
SECONDARY MATERIAL, SEQUENCE PROBABLY REPRESENTS
PORTIONS OF PILLOWS;
Alteration : MOD
NARROW DARK ALTERATION HALOS NEXT TO VEINS;
Leg : 88 Top/Bottom Interval(mm): 0/ 140 Analyst: Natland, J.
Hole: 581B Sample Midpoint (m) : 349.14
Core: 2 Top of Core Depth (m) : 349.00
Sect: 1 Top of Section Depth(m): 349.00
LITHOLOGY: SEDIMENT (CHERT);
Piece No. : PCE 1 (3-14);
Leg : 88 Top/Bottom Interval(mm): 150/1400 Analyst: Natland, J.
Hole: 581B Sample Midpoint (m) : 350.40
Core: 2 Top of Core Depth (m) : 349.00
Sect: 1 Top of Section Depth(m): 349.15
LITHOLOGY: APHYRIC PILLOW BASALT;
Piece No. : PCE 2 (15-28), 3 (30-39), 4 (43-45), 5 (48-58),
6 (60-66), 7A (68-80), 7B (80-90), 8 (96-101),
9A (103-109), 9B (109-116), 10 (119-127),
11A (129-132), 11B (131-139);
Texture : APHYRIC, FINE-GRAINED;
Structure : PILLOW BASALT, RED VEINS AT LOWER END OF SECTION
WITH 2-3CM WIDE BLEACHED ZONES NEXT TO THEM, VEINS &
CRACKS AT TOP OF SECTION FILLED WITH BLACK OR
GREENISH BLACK CLAY, PCE 7 HAS VEIN FIRST LINED WITH
FE.HYDROXIDES THEN WIDENED WITH CARBONATE-CEMENTED
BRECCIA CONTAINING TINY CHIPS OF BASALT and CLAYS &
FE.HYDROXIDES IN CENTER;
Alteration : MOD TO EXT
60-90CM;
EXT
40-60CM, 90-140CM, ROCK ADJACENT TO CRACKS and VEINS
IS STAINED FAINTLY ORANGE, BLEACH ZONES;
MOD
15-40CM;
Comments : PCE 9 IS PROBABLE TOP OF A COOLING UNIT, NO GLASS
RECOVERED;
Replacement: FERROUS HYDROX MINS
LINES VEIN AND IN CHIPS IN PCE 7;
CARBONATE
IN PCE 7 VEIN;
CLAY
IN VEINS;
Leg : 88 Top/Bottom Interval(mm): 0/1370 Analyst: Natland, J.
Hole: 581B Sample Midpoint (m) : 351.87
Core: 2 Top of Core Depth (m) : 349.00
Sect: 2 Top of Section Depth(m): 350.50
LITHOLOGY: APHYRIC PILLOW BASALT (OR FLOW FRAGMENTS);
Piece No. : PCE 1A (2-6), 1B (6-9), 2 (14-21), 3 (24-33),
4 (37-45), 5 (48-57), 6 (60-65), 7A (68-81),
7B (81-88), 8 (92-94), 9 (96-105), 10 (107-111),
11 (114-118), 12A (120-125), 12B (124-127),
13 (131-136);
Texture : APHYRIC, FINE-GRAINED, POSSIBLE FLOW FRAGMENTS,
CONTRAST IN GRAIN SIZE BETWEEN PCES 8&9;
Structure : VEINS FILLED WITH FE.HYDROXIDES, FRACTURE IN PCE 1;
Alteration : MOD
DARK OXIDATION HALOS NEAR VEINS (LEG 54 TYPE);
Comments : COOLING UNITS DIFFICULT TO IDENTIFY (TRANSITION AT
97CM), NO GLASS RECOVERED;
Vesicles : VESICLES IN PCES 2&3 CONTAIN DARK GREEN FILLING;
Replacement: FERROUS HYDROX MINS
IN VEINS;
CLAY
PCE 1 HAS CROSS-CUTTING DARK GRAYISH GREEN CLAY
LINING A FRACTURE;
Leg : 88 Top/Bottom Interval(mm): 0/1500 Analyst: Natland, J.
Hole: 581B Sample Midpoint (m) : 353.50
Core: 2 Top of Core Depth (m) : 349.00
Sect: 3 Top of Section Depth(m): 352.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1A (3-14), 1B (15-21), 2A (24-30), 2B (30-36),
3 (39-45), 4 (47-54), 5 (57-64), 6 (67-72),
7 (75-80), 8 (82-87), 9 (90-98), 10 (101-109),
11 (111-119), 12 (123-133), 13 (136-146);
Texture : APHYRIC, FINE-GRAINED;
Structure : FROM PILLOWS OR THIN FLOWS, FRACTURES LINED WITH
FE.HYDROXIDES--MOST REDDISH AND A FEW VERY DARK
GREEN, FRACTURE IN PCE 13 ALSO CONTAINS CALCITE;
Alteration : MOD;
Comments : POSSIBLE COOLING UNIT BOUNDARIES AT PCES 4&7 (BUT NO
GLASS) WITH A GRAIN SIZE TRANSITION;
Replacement: FERROUS HYDROX MINS
LINES FRACTURES;
CALCITE
IN PCE 13;
Leg : 88 Top/Bottom Interval(mm): 0/1500 Analyst: Natland, J.
Hole: 581B Sample Midpoint (m) : 355.00
Core: 2 Top of Core Depth (m) : 349.00
Sect: 4 Top of Section Depth(m): 353.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1A (4-12), 1B (14-22), 2 (25-32), 3 (35-38),
4A (41-49), 4B (49-55), 5 (57-66), 6 (70-76),
7A (78-85), 7B (85-96), 8 (98-112), 9 (115-123),
10 (126-132), 11 (135-142);
Texture : APHYRIC, FINE-GRAINED, PROBABLY FROM THIN NEAR-
HORIZONTAL FLOWS;
Structure : VEINED WITH REDDISH FE.HYDROXIDES AND LESSER DARK
GRAYISH GREEN CLAYS WITH MINOR WHITISH MATERIAL
(PROBABLY CALCITE and CLAYS), MANY HORIZONTAL AND
VERTICAL FRACTURES IN PCES 1A&4A-B&6-7&9 SUGGEST
SHEET FLOWS;
Alteration : FRESH
ONE OR TWO FRESH PIECES;
MOD
ORANGE ALTERATION HALOS IN PCES 4B&5;
Comments : GRAIN SIZE TRANSITION COOLING UNIT BOUNDARY BETWEEN
PCES 3&4;
Vesicles :
Location: Filling: CALCITE
CALCITE IN VUGS IN PCE 7B;
Replacement: FERROUS HYDROX MINS
CALCITE
CLAY
Leg : 88 Top/Bottom Interval(mm): 0/1400 Analyst: Natland, J.
Hole: 581B Sample Midpoint (m) : 356.40
Core: 2 Top of Core Depth (m) : 349.00
Sect: 5 Top of Section Depth(m): 355.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1 (3-9), 2 (11-20), 3A (23-28), 3B (27-35),
3C (35-37), 4 (42-50), 5 (53-59), 6 (62-65),
7 (68-74), 8 (77-82), 9 (85-92), 10 (96-103),
11 (108-113), 12A (117-122), 12B (122-132),
12C (132-140);
Texture : APHYRIC, FINE TO MEDIUM-GRAINED;
Structure : FRACTURES LINED WITH REDDISH FE.HYDROXIDES (& GREEN
MATERIAL IN PCE 4);
Alteration : MOD TO EXT
ALTERATION RINDS NEXT TO SOME VEINS;
FRESH
PCES 4&6;
Comments : COOLING UNIT BOUNDARY (BUT NO GLASS) AT THE TOP OF
PCE 6;
Replacement: FERROUS HYDROX MINS
LINES FRACTURES;
Leg : 88 Top/Bottom Interval(mm): 0/ 170 Analyst: Natland, J.
Hole: 581B Sample Midpoint (m) : 358.97
Core: 3 Top of Core Depth (m) : 358.80
Sect: 1 Top of Section Depth(m): 358.80
LITHOLOGY: SEDIMENT (CHERT);
Piece No. : PCE 1 (3-9), 2 (14-16);
Leg : 88 Top/Bottom Interval(mm): 170/1500 Analyst: Natland, J.
Hole: 581B Sample Midpoint (m) : 360.30
Core: 3 Top of Core Depth (m) : 358.80
Sect: 1 Top of Section Depth(m): 358.97
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 3A (19-26), 3B (26-30), 4 (35-39), 5 (43-45),
6A (50-55), 6B (55-61), 7 (64-67), 8 (70-74),
9 (77-83), 10 (85-92), 11 (95-99), 12A (102-108),
12B (108-114), 13 (116-124), 14 (126-133),
15 (135-140), 16A (140-144), 16B (142-150);
Texture : APHYRIC, MEDIUM TO FINE-GRAINED;
Structure : VEINS UP TO 0.5CM WIDE LINED WITH REDDISH SECONDARY
MATERIAL;
Alteration : MOD TO EXT
VEINS SURROUNDED BY ALTERATION HALOS, HALOS ARE
DARK GRAY IN PCES 6&12&16 AND STAINED ORANGE IN
PCES 3&9;
Comments : CHANGES IN GRAIN SIZE DENOTE TOPS OF COOLING UNIT
BOUNDARIES AT PCES 6&12A;
Leg : 88 Top/Bottom Interval(mm): 0/1500 Analyst: Natland, J.
Hole: 581B Sample Midpoint (m) : 361.80
Core: 3 Top of Core Depth (m) : 358.80
Sect: 2 Top of Section Depth(m): 360.30
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1A (3-9), 1B (10-12), 2A (14-22), 2B (22-33),
2C (33-36), 3A (39-45), 3B (45-52), 4 (55-58),
5 (61-68), 6 (70-76), 7A (78-85), 7B (85-94),
8A (97-110), 8B (110-120), 8C (120-130),
8D (130-137), 8E (137-144);
Texture : APHYRIC;
Structure : VEINS IN PCES 6&7 ARE DULL ORANGE-GRAY AND FILLED
WITH CALCITE AND REDDISH FE.HYDROXIDES, TWO EPISODES
OF ALTERATION PRODUCED VEINS WITH RED FE.HYDROXIDES
AND DARK GREEN-BLACK VEINS;
Alteration : MOD TO EXT
DARK HALOS NEXT TO FE.HYDROXIDE VEINS, SOME
ALTERATION ZONES HAVE A FAINT YELLOWISH HUE NEXT
TO CRACKS, TWO EPISODES OF ALTERATION;
Comments : NO OBVIOUS GRAIN-SIZE TRANSITIONS OR COOLING UNIT
BOUNDARIES, PCES 7A-B APPEAR TO BE RELATED BUT WERE
CUT ON DIFFERENT AXES SO VEINS DO NOT LINE UP;
Replacement: FERROUS HYDROX MINS
CALCITE
IN VEINS;
Leg : 88 Top/Bottom Interval(mm): 0/1500 Analyst: Natland, J.
Hole: 581B Sample Midpoint (m) : 363.30
Core: 3 Top of Core Depth (m) : 358.80
Sect: 3 Top of Section Depth(m): 361.80
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1A (2-8), 1B (9-20), 1C (20-26), 2 (28-33),
3 (35-39), 4 (42-47), 5 (50-57), 6 (59-63),
7A (64-73), 7B (73-80), 7C (80-88), 8 (91-97),
9 (99-102), 10 (104-109), 11 (112-116),
12A (119-124), 12B (124-131), 12C (131-139),
13 (139-147);
Texture : APHYRIC, PCE 4 IS SPHERULITIC, GLASS ON SIDES OF
PIECES LOWER IN SECTION IMPLIES PILLOWS OR VERY
IRREGULAR FLOW;
Structure : BLACK CLAY-FILLED VEINS IN PCE 7B, RED FE.HYDROXIDE
VEINS ESPECIALLY IN PCE 8;
Alteration : EXT
YELLOWISH HALOS AROUND FE.HYDROXIDE VEINS IN PCES
1A-C;
Comments : PCE 4 IS A PROBABLE COOLING UNIT BOUNDARY;
Replacement: FERROUS HYDROX MINS
CLAY
IN VEINS;
Leg : 88 Top/Bottom Interval(mm): 0/1500 Analyst: Natland, J.
Hole: 581B Sample Midpoint (m) : 367.80
Core: 4 Top of Core Depth (m) : 366.30
Sect: 1 Top of Section Depth(m): 366.30
LITHOLOGY: APHYRIC BASALT;
MASSIVE;
Piece No. : PCE 1 (3-8), 2 (10-17), 3 (21-24), 4 (27-30),
5 (32-35), 6A (38-46), 6B (47-54), 7A (57-65),
7B (65-67), 7C (67-71), 7D (71-78), 7E (78-84),
7F (84-92), 7G (92-100), 7H (100-105), 7I (103-115),
7J (115-123), 7K (123-128), 7L (128-135),
7M (135-143), 7N (143-150);
Texture : APHYRIC, INTERIOR OF COOLING UNIT IS MEDIUM-GRAINED;
Structure : REDDISH VEINS AND CALCITE, PCE 7 IS A FAIRLY MASSIVE
COOLING UNIT;
Alteration : MOD
PCES 1&4 HAVE ALTERED GLASSY MARGINS;
Comments : PCE 7 IS FAIRLY MASSIVE COOLING UNIT >1M THICK WITH
MEDIUM-GRAINED INTERIOR, PCES 1A&B OF SEC 2 ARE
INCLUDED IN SAME FLOW UNIT AS PCE 7 OF THIS SECTION;
Replacement: CALCITE
ALTERATION PRODUCED USUAL REDDISH VEIN FILLINGS
AND CALCITE LOCALLY;
PYRITE
PCE 7C THIN SECTION SHOWS PYRITE;
Leg : 88 Top/Bottom Interval(mm): 0/1430 Analyst: Natland, J.
Hole: 581B Sample Midpoint (m) : 369.23
Core: 4 Top of Core Depth (m) : 366.30
Sect: 2 Top of Section Depth(m): 367.80
LITHOLOGY: APHYRIC BASALT;
MASSIVE;
Piece No. : PCE 1A (3-10), 1B (10-12), 2A (15-22), 2B (22-30),
3 (31-35), 4 (38-45), 5 (47-54), 6A (56-70),
6B (70-78), 6C (78-83), 6D (83-93), 6E (93-105),
7 (109-113), 8 (115-123), 9 (125-132), 10 (135-142);
Texture : APHYRIC, FINE-GRAINED;
Structure : VEINS PREDOMINANTLY LINED WITH FE.OXYHYDROXIDES,
FAIRLY MASSIVE;
Alteration : MOD;
Comments : COOLING UNITS DEFINED BY FINER-GRAINED PCES 2A&4A&7
NONE OF WHICH HAS GLASS, PCES 1A&B ARE A
CONTINUATION OF PCE 7 IN SEC 1;
Replacement: FERROUS OXIDE
Leg : 88 Top/Bottom Interval(mm): 0/ 250 Analyst: Natland, J.
Hole: 581B Sample Midpoint (m) : 369.55
Core: 4 Top of Core Depth (m) : 366.30
Sect: 3 Top of Section Depth(m): 369.30
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1 (3-8), 2 (12-22);
Texture : APHYRIC;
Structure : RED FE.HYDROXIDE VEINS;
Alteration : MOD;
Replacement: FERROUS HYDROX MINS
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