Leg : 33 Top/Bottom Interval(mm): 1110/1370 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 906.87
Core: 31 Top of Core Depth (m) : 905.50
Sect: 1 Top of Section Depth(m): 906.61
LITHOLOGY: SEDIMENT (SILTSTONE);
Piece No. : PCES 1 (111-114), 2 (114-122), 3 (122-126),
4 (126-131), 5 (131-136), 6 (131-135), 7 (135-137),
8 (134-137);
Leg : 33 Top/Bottom Interval(mm): 1370/1500 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 907.00
Core: 31 Top of Core Depth (m) : 905.50
Sect: 1 Top of Section Depth(m): 906.87
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 9 (137-148), 9A (148-150);
Texture : APHYRIC, GROUNDMASS VERY FINE (< 0.05 MM) AND LOOKS
INTERSERTAL;
Alteration : GROUNDMASS PARTIALLY ALTERED;
Comments : CONTACT BETWEEN SILT AND BASALT OCCURS BETWEEN
BROKEN PIECES - IF TRULY ADJACENT CONTACT VERY
SHARP, PCES 9 AND 9A ARE DARK GREENISH GREY, FLOW
UNIT 1;
Vesicles : Size(mm): 1.5 Percent: 15
Location: Filling: ZEOLITE, OTHER
Shape : ELONGATE
Size(mm): 2 X 5 Percent: 15
Location: Filling: ZEOLITE, OTHER
Shape : ELONGATE
VESICULAR, VESICLES AVERAGE 1.5 MM AT TOP AND
2 X 5 MM AT BASE, IRREGULAR SHAPES - MORE OR LESS
ELONGATE AND PERPENDICULAR TO CORE AXIS, FILLED
WITH DARK GREENISH BLACK MATERIAL + A FEW ZEOLITE
FILLINGS, VESICLES ARE 15 PERCENT;
Groundmass : GROUNDMASS VERY FINE (< 0.05 MM), LOOKS
INTERSERTAL, GROUNDMASS PARTIALLY ALTERED;
Replacement: ZEOLITE
IN VESICLES;
Leg : 33 Top/Bottom Interval(mm): 0/ 250 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 907.25
Core: 31 Top of Core Depth (m) : 905.50
Sect: 2 Top of Section Depth(m): 907.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (5-14), 2 (14-17), 3 (17-25);
Comments : BASALT SAME AS CORE 31 SECTION 1 (135-150 CM),
FLOW UNIT 1;
Leg : 33 Top/Bottom Interval(mm): 250/ 280 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 907.28
Core: 31 Top of Core Depth (m) : 905.50
Sect: 2 Top of Section Depth(m): 907.25
LITHOLOGY: SEDIMENT (SILTSTONE);
Piece No. : PCE 4 (25-28);
Comments : PROBABLY SEPARATES FLOW UNITS - BUT PART OF SECTION
IS MISSING FOR NEITHER BASALT ABOVE OR BELOW SHOW
CHILL EFFECTS;
Leg : 33 Top/Bottom Interval(mm): 280/ 880 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 907.88
Core: 31 Top of Core Depth (m) : 905.50
Sect: 2 Top of Section Depth(m): 907.28
LITHOLOGY: BASALT;
Piece No. : PCES 5 (28-46), 6 (46-50), 7 (50-54), 8 (55-61),
9 (61-66), 10 (66-70), 11 (70-80), 12 (80-88);
Texture : GROUNDMASS A LITTLE COARSER AND SEEMS TO CONTAIN
LESS ALTERED GLASS;
Alteration : GROUNDMASS SEEMS TO CONTAIN LESS ALTERED GLASS;
Comments : DARK GREENISH GREY, FLOW UNIT 2;
Vesicles : Size(mm): 2 X 4 Percent: 20
VESICULAR WITH 2 X 4 MM AVERAGE, VESICLES 20
PERCENT, SIZE INCREASING FROM 2 X 4 MM NEAR TOP
TO 4 X 8 MM AT BASE, AT TOP COMPLETELY FILLED WITH
GREENISH BLACK TO GREENISH GREY MATERIAL -
GRADUALLY OPEN DOWNWARD UNTIL ONLY VESICLE WALLS
ARE COATED WITH THIS MATERIAL;
Phenocrysts: PYROXENE
BASALT CONTAINS TINY MICROPHENOCRYSTS OF
PYROXENE;
Leg : 33 Top/Bottom Interval(mm): 880/ 980 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 907.98
Core: 31 Top of Core Depth (m) : 905.50
Sect: 2 Top of Section Depth(m): 907.88
LITHOLOGY: SEDIMENT (SILTSTONE);
Piece No. : PCES 13 (88-93), 14 (88-91), 15 (88-91), 16 (88-91),
17 (92-94), 18 (94-97);
Comments : PROBABLY SEPARATES FLOW UNITS - BUT PART OF SECTION
IS MISSING - BASALTS ON EITHER SIDE DIFFERENT BUT
DO NOT SHOW CHILLED CONTACTS;
Leg : 33 Top/Bottom Interval(mm): 980/1480 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 908.48
Core: 31 Top of Core Depth (m) : 905.50
Sect: 2 Top of Section Depth(m): 907.98
LITHOLOGY: BASALT;
Piece No. : PCES 19 (99-106), 20 (106-109), 21 (110-112),
22 (112-117), 23 (117-119), 24 (119-124),
25 (124-127), 26 (128-131), 27 (128-130),
28 (130-132), 29 (132-134), 30 (133-135),
31 (135-138), 32 (139-141), 33 (142-144),
34 (144-146);
Texture : GROUNDMASS VERY FINE AND APPEARS INTERSERTAL;
Comments : DARK GREENISH GREY, FLOW UNIT 3;
Vesicles : Size(mm): 3 X 5 Percent: 20
Location: Filling: ZEOLITE, OTHER
VERY VESICULAR, VESICLES IRREGULAR - WORMY -
ROUNDED, AVERAGE OF 3 X 5 MM THROUGHOUT - BUT
REACH AS LARGE AS 5 X 10 MM, RATHER EVENLY
DISPERSED THROUGH THIS SECTION, VESICLES LINED
WITH GREENEST BLACK MATERIAL FILLED WITH LIGHT
BLUE GREEN MATERIAL, A VERY FEW FILLED INSIDE
WITH COARSE WHITE ZEOLITES WITH GREENISH BLACK
RIM;
Phenocrysts: PYROXENE ( < 5%)
Size(mm): 0.5
SMALL AMOUNTS OF PYROXENE MICROPHENOCRYSTS;
Replacement: ZEOLITE
A VERY FEW VESICLES FILLED WITH WHITE ZEOLITES
INSIDE A GREENISH BLACK RIM;
Leg : 33 Top/Bottom Interval(mm): 0/ 120 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 908.62
Core: 31 Top of Core Depth (m) : 905.50
Sect: 3 Top of Section Depth(m): 908.50
LITHOLOGY: BASALT;
Piece No. : PCES 1 (0-4), 2 (3-5), 3 (3-5), 4 (2-5), 5 (5-9),
6 (9-12);
Comments : BASALT IS SAME AS BASE OF SECTION 2, FLOW UNIT 3;
Leg : 33 Top/Bottom Interval(mm): 120/ 500 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 909.00
Core: 31 Top of Core Depth (m) : 905.50
Sect: 3 Top of Section Depth(m): 908.62
LITHOLOGY: BASALT;
Piece No. : PCES 7 (13-44), 8 (45-50);
Texture : SAME AS UPPER PORTION OF THIS SECTION EXCEPT
GROUNDMASS IS COARSER AND MORE DIABASIC, SPARSE
MICROPHENOCRYSTS CONTINUE;
Comments : FLOW UNIT 3;
Vesicles : Size(mm): 1 X 2 Percent: < 10
SAME AS ABOVE BUT VESICLES ARE SPARSER AND SMALLER
(1 X 2 MM);
Phenocrysts: SPARSE MICROPHENOCRYSTS CONTINUE;
Replacement: SULFIDES
SULFIDE MINERALS ON PCE 7 AND LOOKS LIKE
CHALCOPYRITE;
CHALCOPYRITE
Leg : 33 Top/Bottom Interval(mm): 500/ 770 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 909.27
Core: 31 Top of Core Depth (m) : 905.50
Sect: 3 Top of Section Depth(m): 909.00
LITHOLOGY: BASALT;
Piece No. : PCES 9 (50-54), 10 (55-60), 11 (60-73), 12 (73-77);
Texture : BASALT MUCH LIKE THAT AT BASE OF SECTION 2 BUT
Comments : COARSER;
FLOW UNIT 3;
Vesicles : Size(mm): 4 X 5 Percent:
Location: Filling: ZEOLITE
BASALT MUCH LIKE THAT AT BASE OF SECTION 2 BUT
VESICLES ARE LESS ABUNDANT AND COARSER, VESICLES
AVERAGE 4 X 5 MM BUT RANGE UP TO GAS TRAILS OF
10 X 25 MM, ALL LINED BY BLACKISH GREY MARL,
50 PERCENT FILLED WITH COARSE WHITE ZEOLITES;
Replacement: ZEOLITE
IN VESICLES;
Leg : 33 Top/Bottom Interval(mm): 770/ 900 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 909.40
Core: 31 Top of Core Depth (m) : 905.50
Sect: 3 Top of Section Depth(m): 909.27
LITHOLOGY: BASALT;
Piece No. : PCES 13 (77-80), 14 (81-89);
Texture : AT 77 CM THERE IS A MARKED CHANGE IN COLOR TEXTURE
AND A PROBABLE CONTACT BUT A LITTLE OF THE CONTACT
SECTION MAY BE MISSING, GLASSY;
Comments : AT 77 CM THERE IS A PROBABLE CONTACT BUT A LITTLE
OF THE CONTACT SECTION MAY MISSING, FLOW UNIT 4,
MEDIUM BLUISH GREY;
Alteration : GLASSY + ALTERED;
Vesicles : Size(mm): 4 X 5 Percent: 40
Location: Filling: ZEOLITE, OTHER
VESICULAR, AVERAGE 4 X 5 MM BUT RANGE UP TO 10-20
CM, VESICLES PARTLY FILLED WITH BLUE GREEN MARL
AND PART BY WHITE ZEOLITES;
Replacement: ZEOLITE
WHITE ZEOLITES IN VESICLES;
Leg : 33 Top/Bottom Interval(mm): 900/1420 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 909.92
Core: 31 Top of Core Depth (m) : 905.50
Sect: 3 Top of Section Depth(m): 909.40
LITHOLOGY: BASALT;
Piece No. : PCES 15 (92-107), 16 (108-122), 17 (122-136),
18 (136-142);
Comments : DARK GREENISH GREY, CENTRAL PART OF FLOW UNIT 4;
Vesicles : Size(mm): 1 X 2 Percent:
VESICULAR, VESICLES AVERAGE 1 X 2 MM BUT
OCCASIONALLY VERY LARGE REACHING VERTICAL VESICLE
TRAILS (5 X 20 MM), FILLINGS AS IN TOP OF UNIT;
Phenocrysts: CLINOPYROXENE ( 5%)
CONTAINS MICROPHENOCRYSTS OF CPX;
Leg : 33 Top/Bottom Interval(mm): 1420/1500 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 910.00
Core: 31 Top of Core Depth (m) : 905.50
Sect: 3 Top of Section Depth(m): 909.92
LITHOLOGY: BASALT;
Piece No. : PCES 19 (142-145), 20 (142-145), 21 (145-150);
Comments : BOTTOM OF FLOW UNIT 4, VERY MUCH LIKE TOP OF UNIT;
Vesicles : VESICULAR;
Leg : 33 Top/Bottom Interval(mm): 0/ 390 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 910.39
Core: 31 Top of Core Depth (m) : 905.50
Sect: 4 Top of Section Depth(m): 910.00
LITHOLOGY: BASALT;
Piece No. : PCES 1 (0-3), 2 (3-11), 3 (11-18), 4 (18-27),
5 (28-35), 6 (29-32), 7 (32-34), 8 (36-39);
Comments : IDENTICAL TO THAT AT BASE OF SECTION 3, PROBABLE
BASE OF FLOW UNIT 4;
Vesicles : VESICULAR;
Leg : 33 Top/Bottom Interval(mm): 390/ 460 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 910.46
Core: 31 Top of Core Depth (m) : 905.50
Sect: 4 Top of Section Depth(m): 910.39
LITHOLOGY: BASALT;
Piece No. : PCES 9 (39-46);
Texture : NON-VESICULAR, VERY FINE GRAINED;
Comments : GREENISH GREY, PROBABLE TOP OF FLOW UNIT 5;
Vesicles : NON-VESICULAR;
Leg : 33 Top/Bottom Interval(mm): 460/1500 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 911.50
Core: 31 Top of Core Depth (m) : 905.50
Sect: 4 Top of Section Depth(m): 910.46
LITHOLOGY: BASALT;
Piece No. : PCES 10 (46-66), 11 (66-104), 12 (104-120),
13 (120-127), 14 (127-150);
Texture : GROUNDMASS VERY FINE, DIABASIC TO INTERSERTAL;
Comments : CENTRAL PART OF FLOW UNIT 5;
Vesicles : Size(mm): 1 X 1 Percent: 10
VESICULAR, VESICLES IRREGULAR, MOSTLY AVERAGE
1 X 1 MM AND MAKE UP 10 PERCENT OF ROCK, ALL ARE
LINED WITH GREENISH BLACK MATERIAL;
Size(mm): 6 X 10 Percent:
Location: Filling: ZEOLITES
MUCH LARGER VESICLES (UP TO 6 X 10 MM) MAKE UP
BLACK MATERIAL, LARGER VESICLES PARTLY FILLED WITH
THIS MATERIAL + PARTLY FILLED WITH WHITE
ZEOLITES + PARTLY OPEN;
Phenocrysts: PYROXENE ( 5-10%)
Size(mm): 0.5
PYX MICROPHENOCRYTS;
Groundmass : PLAGIOCLASE
Size(mm): 0.2 X 10
CENTRAL PART (65-105 MM) CHARACTERIZED BY PLATE
SHAPED PLAG UP TO 0.2 X 10 MM THAT LIE
PERPENDICULAR TO CORE;
Replacement: ZEOLITE
IN VESICLES;
Leg : 33 Top/Bottom Interval(mm): 110/1500 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 916.50
Core: 32 Top of Core Depth (m) : 915.00
Sect: 1 Top of Section Depth(m): 915.11
LITHOLOGY: BASALT;
Piece No. : PCES 1 (11-15), 2 (15-36), 3 (35-55), 4 (55-96),
5 (96-141), 6 (141-150);
Texture : TABULAR FELDSPAR LATHS OCCUR THROUGHOUT AND
STRIKINGLY WELL DEVELOPED BETWEEN 15-50 CM;
Comments : BASALT APPEARS IDENTICAL TO CENTRAL PART OF FLOW
UNIT 5 CORE 33 SECTION 4;
Vesicles :
Location: Filling: ZEOLITE
ZEOLITE FILLINGS OF LARGER VESICLES OCCUR ONLY
BETWEEN 11-44 CM;
Size(mm): 10 X 20 Percent:
Location: Filling: OTHER
LARGEST VESICLES 10 X 20 MM ARE ALL LINED
AS ABOVE - MOSTLY FILLED WITH GREENISH BLACK
MATERIAL EXCEPT AT TOP AS NOTED;
Phenocrysts: PYROXENE ( 5-10%)
5-10 PERCENT PYX MICROPHENOCRYSTS PERSIST
THROUGHOUT;
Groundmass : FELDSPAR
TABULAR FELDSPAR LATHS OCCUR THROUGHOUT AND
STRIKINGLY WELL DEVELOPED BETWEEN 15-50 CM;
Replacement: ZEOLITE
ZEOLITE FILLINGS OF LARGER VESICLES OCCUR ONLY
BETWEEN 11-44 CM;
Leg : 33 Top/Bottom Interval(mm): 20/1500 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 918.00
Core: 32 Top of Core Depth (m) : 915.00
Sect: 2 Top of Section Depth(m): 916.52
LITHOLOGY: BASALT;
Piece No. : PCES 1 (2-22), 2 (14-32), 3 (32-40), 4 (40-54),
5 (54-60), 6 (60-82), 7 (81-89), 8 (89-92),
9 (92-94), 10 (94-100), 11 (100-109), 12 (110-120),
13 (120-135), 14 (135-140), 15 (140-150);
Comments : IDENTICAL TO CENTRAL PART OF FLOW UNIT 5 CORE 33
SECTION 4 AND CORE 34 SECTION 1;
Vesicles :
Location: Filling: OTHER
VESICULAR, LARGE VESICLES ARE LESS ABUNDANT FROM
90-150 CM, ALL VESICLES COATED IF NOT FILLED BY
GREENISH BLACK MATERIAL NOTED EARLIER, NO ZEOLITES
OR BLUE GREEN MATERIAL OBSERVED IN THIS SECTION;
Groundmass : PLAGIOCLASE
PLATY PLAG WELL DEVELOPED FROM 3- 30 CM AND AGAIN
FROM 80-120 CM ALTHOUGH SOME STANDS AT 20-30
DEGREES TO CORE WALLS, SOME OF THE SAME HIGH ANGLE
CHARACTER ALTHOUGH IN THE OPPOSITE SENSE OCCURS
BETWEEN 40-50 CM;
Leg : 33 Top/Bottom Interval(mm): 0/ 0 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 918.00
Core: 32 Top of Core Depth (m) : 915.00
Sect: 3 Top of Section Depth(m): 918.00
LITHOLOGY: BASALT;
Comments : VISUAL CORE DESCRIPTION IS MISSING FOR CORE 32
SECTION 3 - REFER TO INITIAL REPORTS FOR INFORMATION
CONCERNING THIS UNIT;
Leg : 33 Top/Bottom Interval(mm): 110/ 850 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 920.35
Core: 32 Top of Core Depth (m) : 915.00
Sect: 4 Top of Section Depth(m): 919.61
LITHOLOGY: BASALT;
Piece No. : PCES 1 (11-54), 2 (54-59), 3 (60-72), 4 (72-81),
5 (81-85);
Texture : PLAG LATHS ALIGNED PERPENDICULAR TO CORE (10-40 CM),
BELOW 40 CM BECOMES FINER GRAINED AND APPEARS TO
CONTAIN MORE ALTERED INTERSERTAL GLASS AND VESICLES
BECOME SOMEWHAT SMALLER (AVG 5 MM);
Structure : FRACTURES AT 40-50 CM;
Comments : APPEARS TO BE IDENTICAL TO CENTRAL PART OF FLOW
UNIT 5 (CORE 32 SECTION 4 + CORE 33 SECTIONS 1-3),
FLOW UNIT 5;
Vesicles : Size(mm): 5 Percent:
Location: Filling: OTHER
VESICULAR, VESICLES LESS STRONGLY ALIGNED, BELOW
40 CM VESICLES BECOME SOMEWHAT SMALLER AVERAGING
5 MM - STILL AT 41 CM ONE 5 X 20 MM VESICLE OCCURS
PERPENDICULAR TO CORE AXIS, VESICLE LINING AND
FILLING STILL ONLY GREENISH BLACK MATERIAL + NO
ZEOLITES OR BLUE GREEN FILLINGS OBSERVED;
Phenocrysts: PYROXENE
PYX MICROPHENOCRYSTS;
Groundmass : PLAGIOCLASE
PLAG LATHS ALIGNED PERPENDICULAR TO CORE;
Replacement: ZEOLITE ( 0%)
NO ZEOLITES;
Leg : 33 Top/Bottom Interval(mm): 850/1500 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 921.00
Core: 32 Top of Core Depth (m) : 915.00
Sect: 4 Top of Section Depth(m): 920.35
LITHOLOGY: BASALT;
Piece No. : PCES 6 (85-101), 7 (101-150);
Texture : APHYRIC, FELDSPARS STUBBY LATHS, GROUNDMASS TEXTURE
APPEARS TO BE DIABASIC TO INTERSERTAL;
Structure : FRACTURE AT 130-135 CM VISIBLY ALTERED TO GREENISH
BLACK MARL ON WALLS AND CONTAINS SOME CALCITE;
Alteration : LESS GLASS MAYBE THAN UNIT 4 BUT IT APPEARS TO BE
ALTERED, FRACTURE AT 130-135 CM VISIBLY ALTERED TO
GREENISH BLACK MARL ON WALLS AND CONTAINS SOME
CALCITE;
Comments : CONTACT BETWEEN FLOW UNIT 5 AND FLOW UNIT 6 IS AT
88 CM, FLOW UNIT 6, GREENISH GREY;
Vesicles : Size(mm): 1 X 2 Percent:
Location: Filling: OTHER
VESICULAR, VESICLES EVEN SIZED EXCEPT NEAR TOP,
AVERAGE 1 X 2 MM, IRREGULAR SHAPES, NO PARTICULAR
ORIENTATION, AT TOP A FEW LARGE VESICLES
(5 X 10 CM) NEARLY PARALLEL TO CORE AXIS, VESICLES
LINED WITH GREENISH BLACK MATERIAL, GENERALLY
FILLED THOUGH WASHED OUT ON CORE SURFACES;
Groundmass : GLASS
LESS GLASS MAYBE THAN UNIT 4 BUT IT APPEARS TO BE
ALTERED;
FELDSPAR
FELDSPAR IN STUBBY LATHS;
Replacement: CALCITE
IN FRACTURE AT 130-135 CM;
Leg : 33 Top/Bottom Interval(mm): 0/1500 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 922.50
Core: 32 Top of Core Depth (m) : 915.00
Sect: 5 Top of Section Depth(m): 921.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (0-75), 2 (75-89), 3 (89-150);
Texture : APHYRIC, VERY HOMOGENEOUS IN GRAIN SIZE;
Structure : VEINS AT 60-65 CM AND 102-105 CM FOLLOW FRACTURES
WITH MOSTLY GREENISH BLACK ALTERATION BUT SOME
CALCITE PRESENT;
Alteration : VERY HOMOGENEOUS IN ALTERATION, VEINS FOLLOW
FRACTURES WITH MOSTLY GREENISH BLACK ALTERATION
BUT SOME CALCITE PRESENT, ALTERED YELLOW MINERAL
AT 8 CM AND 45-55 CM WHICH IS OF DIMENSIONS
1.5 X 1.5 MM POSSIBLY EX-OLIVINE PHENOS;
Comments : GREENISH GREY, APPEARS IDENTICAL TO UNIT 5 DESCRIBED
IN LOWER PART OF CORE 32 SECTION 4;
Vesicles : VESICULAR, VERY HOMOGENEOUS IN VESICLE PERCENTAGE
AND SIZE;
Replacement: CALCITE
IN VEINS;
OTHER
ALTERED YELLOW MINERAL AT 8 CM AND 45-55 CM;
Leg : 33 Top/Bottom Interval(mm): 0/1500 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 924.00
Core: 32 Top of Core Depth (m) : 915.00
Sect: 6 Top of Section Depth(m): 922.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (0-14), 2 (15-20), 3 (15-20), 4 (15-20),
5 (20-39), 6 (39-84), 7 (79-100), 8 (100-126),
9 (126-150);
Texture : APHYRIC, FROM 0-17 CM AND 17-100 CM UNIT GRADUALLY
COARSENS IN GRAIN SIZE, BY 100-130 CM GRAIN SIZE IS
ABOUT 0.2 - 0.3 MM, PLAG LATHS REACH 2 X 5 MM BUT
AVERAGE MUCH LESS (0.05 X 1 MM), PLAG LATHS TEND TO
LIE PERPENDICULAR TO CORE AXIS BUT NOT AS STRONGLY
AS IN FLOW UNIT 5;
Structure : VEINS NEARLY VERTICAL IN PCE 1 AND SEVERAL NEAR BASE
OF PCE 5 (THIS WHOLE AREA FROM ABOUT 26-36 CM IS
ALTERED), VEIN IN PCE 7, ALL VEINS ARE INCIPIENT
FRACTURES AND ALL HAVE ALTERED MARGINS OF GREENISH
BLACK MATERIAL (1-2 MM ON EITHER SIDE);
Alteration : SEVERAL VEINS NEAR BASE OF PCE 5 AND THIS WHOLE
AREA FROM ABOUT 26-36 CM IS ALTERED, ALL VEINS ARE
INCIPIENT FRACTURES AND ALL HAVE ALTERED MARGINS
OF GREENISH BLACK MATERIAL (1-2 MM ON EITHER
SIDE);
Comments : GREENISH GREY, FLOW UNIT 6 + SAME FLOW UNIT AS
BOTTOM OF SECTION 4 AND ALL OF SECTION 5
(FLOW UNIT 5) AND HAS SAME DESCRIPTION;
Vesicles :
Location: Filling: ZEOLITE, CALCITE
VESICULAR, FROM 0-100 CM UNIT GRADUALLY COARSENS
IN VESICLE SIZE, ALL VESICLES FILLED WITH
GREENISH BLACK MATERIAL EXCEPT A FEW WITH
ZEOLITES + CALCITE NEAR 13-16 CM AND 34-38 CM;
Size(mm): 2 X 3 Percent:
Location: Filling: OTHER
BY 100-130 CM VESICLE SIZE TYPICALLY 2 X 3 MM,
ALL VESICLES FILLED WITH GREENISH BLACK MATERIAL
EXCEPT A FEW WITH ZEOLITES + CALCITE NEAR 13-16 CM
AND NEAR 34-38 CM;
Groundmass : PLAGIOCLASE
Size(mm): TO 2 X 5
PLAG LATHS REACH 2 X 5 MM BUT AVERAGE MUCH LESS
(0.05 X 1 MM), PLAG LATHS TEND TO LIE
PERPENDICULAR TO CORE AXIS BUT NOT AS STRONGLY
AS IN FLOW UNIT 5;
Replacement: ZEOLITE
IN A FEW VESICLES NEAR 13-16 CM AND NEAR 34-38 CM;
CALCITE
IN A FEW VESICLES NEAR 13-16 CM AND NEAR 34-38 CM;
Leg : 33 Top/Bottom Interval(mm): 20/1500 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 926.00
Core: 33 Top of Core Depth (m) : 924.50
Sect: 1 Top of Section Depth(m): 924.52
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (2-8), 2 (8-14), 3 (14-19), 4 (19-34),
5 (35-42), 6 (44-46), 7 (43-45), 8 (47-61),
9 (61-63), 10 (63-82), 11 (82-92), 12 (92-115),
13 (115-122), 14 (122-150);
Texture : APHYRIC, TEXTURE CONTINUE COARSE PERHAPS FINING
TOWARD THE LOWER END;
Structure : APPEARS IDENTICAL TO CORE 32 SECTION 6 BUT MORE
FRACTURED AND VEINED, ESPECIALLY BADLY FRACTURED
IN THE INTERVALS (7-30 CM) (48-80 CM) AND
(90-105 CM), ALL VEINS AND INCIPIENT FRACTURES ARE
ALTERED AND FREQUENTLY THE BASALT BETWEEN THEM IS
COLORED GREENISH BLACK, A LITTLE CALCITE NEAR SOME
FRACTURES AND BROKEN ENDS;
Alteration : APPEARS IDENTICAL TO CORE 32 SECTION 6 BUT IS MORE
ALTERED IN THE UPPER PART PERHAPS FRESHER IN THE
LOWER PART, ALL VEINS AND INCIPIENT FRACTURES ARE
ALTERED AND FREQUENTLY THE BASALT BETWEEN THEM IS
COLORED GREENISH BLACK;
Comments : GREENISH GREY, FLOW UNIT 6, APPEARS IDENTICAL TO
CORE 32 SECTION 6 BUT MORE FRACTURED MORE VEINED +
IT IS MORE ALTERED IN THE UPPER PART AND PERHAPS
FRESHER IN LOWER PART;
Vesicles :
Location: Filling: OTHER
VESICULAR, VESICLES COARSE, ALL VESICLES FILLED
WITH GREENISH BLACK MATERIAL WITH A LITTLE CALCITE
NEAR SOME FRACTURES AND BROKEN ENDS;
Replacement: CALCITE
Leg : 33 Top/Bottom Interval(mm): 0/1500 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 927.50
Core: 33 Top of Core Depth (m) : 924.50
Sect: 2 Top of Section Depth(m): 926.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (0-15), 2 (15-41), 3 (41-60), 4 (61-110),
5 (110-131), 6 (131-150);
Texture : APHYRIC, FINER GRAINED THAN CORE 32 SECTION 6 AND
CORE 33 SECTION 1 ALTHOUGH ALMOST SURELY PART
OF THE SAME FLOW UNIT;
Structure : SMALL FRACTURES IN THE INTERVALS (1-15 CM)
(122-135 CM) AND AT 42 CM;
Alteration : SOME ALTERATION BUT NOT NEARLY SO MARKED AS IN
CORE 33 SECTION 2;
Comments : GREENISH GREY, FLOW UNIT 6, ALMOST IDENTICAL TO
CORE 32 SECTION 5, FINER GRAINED THAN CORE 32
SECTION 6 AND CORE 33 SECTION 1 ALTHOUGH ALMOST
SURELY PART OF THE SAME FLOW UNIT;
Vesicles : FINER VESICLES THAN CORE 32 SECTION 6 AND CORE 33
SECTION 1;
Leg : 33 Top/Bottom Interval(mm): 0/ 0 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 927.50
Core: 33 Top of Core Depth (m) : 924.50
Sect: 3 Top of Section Depth(m): 927.50
LITHOLOGY: BASALT;
Comments : VISUAL CORE DESCRIPTION IS MISSING FOR CORE 33
SECTION 3 - REFER TO INITIAL REPORTS FOR INFORMATION
CONCERNING THIS UNIT;
Leg : 33 Top/Bottom Interval(mm): 200/ 350 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 929.35
Core: 33 Top of Core Depth (m) : 924.50
Sect: 4 Top of Section Depth(m): 929.20
LITHOLOGY: SEDIMENT (SILTSTONE AND CLAYSTONE);
Piece No. : PCES 1 (20-24), 2 (20-24), 3 (22-27), 4 (27-30),
5 (27-30), 6 (30-34), 7 (30-34);
Leg : 33 Top/Bottom Interval(mm): 350/1500 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 930.50
Core: 33 Top of Core Depth (m) : 924.50
Sect: 4 Top of Section Depth(m): 929.35
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 8 (35-40), 9 (40-45), 10 (45-51), 11 (51-55),
12 (55-60), 13 (60-68), 14 (68-74), 15 (74-80),
16 (80-84), 17 (84-90), 18 (90-93), 19 (91-96),
20 (96-98), 21 (98-106), 22 (106-112), 23 (112-115),
24 (112-125), 25 (125-136), 26 (136-150);
Texture : APHYRIC, GROUNDMASS VERY FINE + INTERGRANULAR +
SOME INTERSERTAL, BASALT BELOW CONTACT (AT 35 CM)
SHOWS ALTERED CHILLED MARGIN;
Structure : FRACTURES (110-120 CM) PARTIALLY FILLED WITH
CALCITE;
Alteration : GLASS APPEARS BADLY ALTERED, BASALT BELOW CONTACT
(AT 35 CM) SHOWS ALTERED CHILLED MARGIN;
Comments : DARK GREENISH GREY, FLOW UNIT 7, CONTACT AT 35 CM;
Vesicles : Size(mm): 2 X 2 Percent: 10
Location: Filling: OTHER
VESICULAR, VESICLES LARGE AND AVERAGE 2 X 2 MM
BUT RANGE UP TO 6 X 6 MM, IRREGULAR DISTRIBUTION,
LINED AND MOSTLY FILLED WITH GREENISH BLACK
MATERIAL, VESICLES SPHERICAL TO IRREGULAR
ROUNDED WITHOUT ANY PARTICULAR PATTERN, AVERAGE
ABOUT 10 PERCENT OF ROCK;
Groundmass : GLASS
GLASS APPEARS BADLY ALTERED;
Replacement: CALCITE
FRACTURES (110-120 CM) PARTIALLY FILLED WITH
CALCITE;
Leg : 33 Top/Bottom Interval(mm): 100/ 900 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 934.90
Core: 34 Top of Core Depth (m) : 934.00
Sect: 1 Top of Section Depth(m): 934.10
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (10-29), 2 (29-51), 3 (51-60), 4 (61-65),
5 (66-70), 6 (70-79), 7 (79-86), 8 (86-90);
Texture : APHYRIC, VERTICAL FELDSPAR LATHS AS LARGE AS
5.0 X 4.0 MM IN UPPER PART WITH AVERAGE SIZE IN
LOWER 0.1 X 3 MM (GRADING DOWNWARD IN SIZE), SOME
ARE VERTICAL VARIOLITIC STREAKS, GROUNDMASS HAS
VERTICAL TRACHYTIC LATHS;
Comments : GREENISH GREY, POSSIBLY LOWER PART OF FLOW UNIT 7;
Vesicles : Size(mm): 5-10 Percent:
VESICULAR, VESICLES LARGE IN UPPER PART UP TO
5-10 MM, SOME IN OBLIQUE TRAILS 50 MM LONG;
Size(mm): 1 Percent:
Location: Filling: OTHER, ZEOLITE
GRADUALLY CHANGES DOWNWARD TO IRREGULAR SHAPED
VESICLES AVERAGING 1 MM IN DIAMETER, MOSTLY FILLED
WITH GREENISH BLACK MATERIAL BUT ZEOLITES ARE
FAIRLY ABUNDANT;
Groundmass : FELDSPAR
Size(mm): TO 5 X 4
VERTICAL FELDSPAR LATHS AS LARGE AS 5 X 4 MM
IN UPPER PART WITH AVERAGE SIZE IN LOWER PART
IS 0.1 X 3 MM GRADING DOWNWARD IN SIZE, SOME OF
THESE LATHS ARE VERTICAL VARIOLITIC STREAKS;
GLASS
GLASS NOT ABUNDANT IF PRESENT;
Replacement: ZEOLITE
IN VESICLES;
Leg : 33 Top/Bottom Interval(mm): 900/1500 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 935.50
Core: 34 Top of Core Depth (m) : 934.00
Sect: 1 Top of Section Depth(m): 934.90
LITHOLOGY: BASALT;
Piece No. : PCES 9 (90-93), 10 (93-96), 11 (96-99), 12 (99-102),
13 (102-106), 14 (106-112), 15 (112-118),
16 (118-122), 17 (122-126), 18 (122-126),
19 (126-129), 20 (129-133), 21 (133-137),
22 (137-142), 23 (142-150);
Texture : INTERVAL (142-150 CM) IS FINER GRAINED, APHYRIC AND
HAS FEWER VESICLES;
Alteration : CONTACT AT 90 CM ALTERED (POSSIBLY CHLORITIZED);
Comments : UPPER PART OF FLOW UNIT 8, CONTACT AT 90 CM ALTERED
(POSSIBLY CHLORITIZED) AND WEATHERED WITH UPPER 20
CM OF LOWER FLOW AFFECTED, DARK GREENISH GREY;
Vesicles : Size(mm): 2 X 3 Percent:
Location: Filling: OTHER
VESICULAR, SIZE RANGE OF 1 X 1 MM TO 10 X 15 MM
WITH AVERAGE OF 2 X 3 MM, PHENOS MAKE UP 5 PERCENT
OF VESICULAR ROCK AND GLOMEROPORPHYRITIC CLOTS
MAKE UP 10 PERCENT OF VESICULAR ROCK, VESICLES
VERY ABUNDANT IN UPPER PART OF FLOW UNIT 8, LINED
AND FILLED PARTLY BY GREENISH BLACK MATERIAL AND
PARTLY BY MICROCRYSTALLINE PALE BLUE-GREEN
MATERIAL;
Size(mm): Percent: 30
Location: Filling: ZEOLITES
VESICLES MAKE UP 30 PERCENT OF ROCK FROM
118-143 CM, COARSE ZEOLITES FILL VESICLES IN
LOWER PART OF VESICULAR SECTION, LOWEST PART
(142-150 CM) HAVE FEWER VESICLES;
Phenocrysts: PLAGIOCLASE
Size(mm): 1 X 1
VESICULAR WITH PLAG PHENOS AND GLOMEROPORPHYRITIC
CLOTS OF PYX AND PLAG, PLAG PHENOS SMALL BLOCKY
(1 X 1 MM), CLOTS ARE LARGER (2 X 2 MM), PHENOS
MAKE UP 5 PERCENT OF VESICULAR ROCK AND CLOTS
PERHAPS 10 PERCENT;
PYROXENE
IN GLOMEROPORPHYRITIC CLOTS OF PYX AND PLAG,
CLOTS ARE 2 X 2 MM, CLOTS MAKE UP 10 PERCENT OF
VESICULAR ROCK;
Replacement: ZEOLITE
IN VESICLES;
Leg : 33 Top/Bottom Interval(mm): 0/ 400 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 935.90
Core: 34 Top of Core Depth (m) : 934.00
Sect: 2 Top of Section Depth(m): 935.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (0-4), 2 (4-9), 3 (9-12), 4 (9-12),
5 (12-15), 6 (12-19), 7 (19-26), 8 (26-39),
9 (38-40);
Texture : APHYRIC, FELDSPAR LATHS;
Comments : GREENISH GREY, LOWER PART OF FLOW UNIT 8, MUCH LIKE
UNIT AT TOP OF SECTION 1 (LOWER PART OF FLOW
UNIT 7) ;
Vesicles : VESICULAR;
Groundmass : FELDSPAR
FELDSPAR LATHS;
Leg : 33 Top/Bottom Interval(mm): 400/1500 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 937.00
Core: 34 Top of Core Depth (m) : 934.00
Sect: 2 Top of Section Depth(m): 935.90
LITHOLOGY: BASALT;
Piece No. : PCES 10 (40-42), 11 (42-46), 12 (46-49), 13 (49-53),
14 (53-56), 15 (56-60), 16 (60-64), 17 (64-71),
18 (71-74), 19 (74-79), 20 (79-83), 21 (83-87),
22 (87-99), 23 (99-104), 24 (104-116),
25 (116-125), 26 (125-129), 27 (125-129),
28 (129-150);
Texture : MUCH LIKE UPPER AND MIDDLE PART OF FLOW UNIT 8 DOWN
TO 110 CM - THEN BECOMES GRADUALLY FINER LIKE LOWER
PART OF FLOW UNIT 8;
Alteration : CONTACT AT 40 CM - UPPER 5 CM ALTERED AND POSSIBLY
WEATHERED OR CHLORITIZED;
Comments : GREENISH GREY, CONTACT AT 40 CM ALTERED AND POSSIBLY
WEATHERED OR CHLORITIZED, LIGHT BLUE-GREEN VESICLE
FILLING MATERIAL CONCENTRATED NEAR UPPER CONTACT,
ALL FLOW UNIT 9 BELOW CONTACT;
Vesicles :
Location: Filling: OTHER
VESICULAR, VESICLES VERY LARGE IN CENTRAL PART
UP TO 15 X 15 X 20 MM - MUCH LIKE UPPER AND
AND MIDDLE PART OF FLOW UNIT 8 DOWN TO 110 CM -
THEN BECOMES GRADUALLY FINER LIKE LOWER PART OF
FLOW UNIT 8, LIGHT BLUE GREEN VESICLE FILLING
MATERIAL CONCENTRATED NEAR UPPER CONTACT;
Phenocrysts: PLAGIOCLASE
PLAG PHENOS AND GLOMEROPORPHYRITIC CLOTS;
Replacement: ZEOLITE
IN CENTRAL PART;
Leg : 33 Top/Bottom Interval(mm): 0/1500 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 938.50
Core: 34 Top of Core Depth (m) : 934.00
Sect: 3 Top of Section Depth(m): 937.00
LITHOLOGY: BASALT;
Piece No. : PCES 1 (0-11), 2 (11-15), 3 (15-19), 4 (19-24),
5 (24-27), 6 (27-34), 7 (34-40), 8 (40-46),
9 (46-54), 10 (54-59), 11 (59-64), 12 (64-69),
13 (69-75), 14 (75-81), 15 (81-85), 16 (84-88),
17 (88-92), 18 (88-91), 19 (91-93), 20 (93-96),
21 (96-101), 22 (101-103), 23 (103-105),
24 (105-109), 25 (109-114), 26 (114-121),
27 (121-123), 28 (123-127), 29 (127-134),
30 (134-137), 31 (137-141), 32 (141-145),
33 (145-148), 34 (148-150);
Texture : VERTICAL FELDSPARS;
Alteration : CONTACT AT 19 CM ALTERED;
Comments : 0-19 CM IS CONTINUATION OF LOWER PART - CORE 34
SECTION 2 - FLOW UNIT 9 - DESCRIPTION THE SAME,
CONTACT AT 19 CM, CONTACT ALTERED, BELOW CONTACT
BASALT IS EXACTLY LIKE UPPER AND MIDDLE PARTS OF
FLOW UNIT 9 - THIS IS FLOW UNIT 10;
Vesicles : SMALL VESICLES (0-19 CM);
Size(mm): 5 X 8 Percent:
Location: Filling: OTHER
LIGHT BLUE GREEN VESICLE FILLING MATERIAL
CONCENTRATED AT CONTACT AND 20 CM BELOW IT,
MAXIMUM VESICLE SIZE IS 20 X 20 X 20 MM,
AVERAGE SIZE OF 5 X 8 MM AND SLIGHTLY FLATTENED
PERPENDICULAR TO CORE AXIS, NO APPRECIABLE
ZEOLITE FILLINGS;
Groundmass : FELDSPAR
VERTICAL FELDSPAR;
Replacement: ZEOLITE ( 0%)
NO APPRECIABLE ZEOLITE FILLINGS;
Leg : 33 Top/Bottom Interval(mm): 180/1500 Analyst: Jackson, E.D.
Hole: 317A Sample Midpoint (m) : 940.00
Core: 34 Top of Core Depth (m) : 934.00
Sect: 4 Top of Section Depth(m): 938.68
LITHOLOGY: BASALT;
Piece No. : PCES 1 (18-21), 2 (21-29), 3 (29-34), 4 (34-38),
5 (38-45), 6 (45-51), 7 (51-59), 8 (59-70),
9 (70-76), 10 (76-80), 11 (80-85), 12 (85-91),
13 (91-94), 14 (94-98), 15 (98-104), 16 (104-109),
17 (109-111), 18 (111-118), 19 (118-125),
20 (125-135), 21 (135-144), 22 (144-146),
23 (146-150), 24 (146-150);
Texture : FINER DOWNWARD TO VERTICAL FELDSPAR TYPE AT 110 CM;
Alteration : BLACKISH GREEN ALTERATION;
Comments : CONTINUATION OF MIDDLE AND LOWER PART,
FLOW UNIT 10;
Vesicles :
Location: Filling: ZEOLITE
HEAVY CONCENTRATION OF ZEOLITES IN VESICLES
(38-51 CM);
Groundmass : FELDSPAR
Replacement: ZEOLITE
IN VESICLES;
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