Leg : 34 Top/Bottom Interval(mm): 0/1220 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 99.22
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 98.00
LITHOLOGY: PLAG-OL SPARSELY MICROPHYRIC BASALT;
DIABASE;
Piece No. : PCE 1 (3-5), 2 (6-9), 3 (11-17), 4 (20-27),
5 (29-37), 6 (38-46), 7 (48-53), 8 (55-59),
9 (61-64), 10 (67-71), 11 (71-73), 12 (77-81),
13 (77-81), 14 (83-90), 15 (92-96), 16 (98-102),
17 (104-107), 18 (109-115), 19 (117-120),
20 (123-126);
Texture : THE GRAIN SIZE INCREASES FROM APHANITIC AT THE TOP
TO COARSE-GRAINED AT 38CM & REMAINS COARSE-GRAINED
TO ABOUT 98CM & DECREASES THEREAFTER TO FINE-GRAINED
VARIOLITIC (PLUMOSE) BASALT AT THE BASE, SPARSELY
MICROPHYRIC;
Structure : VEINS INCLUDE RED & BROWN & RED-BROWN & YELLOW-BROWN
& YELLOW & GREENISH YELLOW & GREEN & BLUE SMECTITE &
CALCITE & FE.OXIDE & MN.OXIDE & PHILLIPSITE(?);
Comments : STYROFOAM DIVIDERS ABOUT 2CM WIDE SEPARATE PIECES
OF CORE THAT ARE NOT PART OF A CONTINUOUS CORE
SEGMENT - AN UNKNOWN AMOUNT OF BASALT IS MISSING IN
THE PLACES WHERE STYROFOAM HAS BEEN ADDED, A COOLING
UNIT EXTENDS FROM THE TOP OF SEC 1 TO AT LEAST 115 &
POSSIBLY 122CM, THE ROCK VARIES FROM DARK GRAY
(RARELY MEDIUM GRAY) WHERE FRESH TO DARK BROWNISH OR
YELLOWISH GRAY;
Vesicles :
Location: Filling: ARAGONITE
SMALL DIKTYTAXITIC VUGS APPEAR AT 29-46CM & 109-
115CM, RARE LARGE VUGS WITH ARAGONITE APPEAR AT
77-81CM;
Phenocrysts: PLAGIOCLASE ( 0-2%)
MICROPHENOCRYSTS OF PLAG & ALTERED OLIVINE VARY IN
ABUNDANCE FROM 1% AT TOP TO ALMOST NIL THROUGH
MOST OF THE UNIT TO 1-2% BELOW 104CM WITH A
SUGGESTION OF ACCUMULATION IN 104-107CM;
OLIVINE
Replacement: SMECTITE
Minerals Replaced: OLIVINE
OLIVE GREEN COLOR;
FERROUS OXIDE
MANGANESE OXIDE
PHILLIPSITE
CALCITE
CONICAL CALCITE CRYSTALS LINE OPEN JOINTS AT 77-
81CM;
ARAGONITE
Leg : 34 Top/Bottom Interval(mm): 1250/1500 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 99.50
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 99.25
LITHOLOGY: APHYRIC TO PLAG-OL-AUGITE MICROPHYRIC BASALT;
Piece No. : PCE 21 (124-135), 22 (137-142), 23 (144-148);
Texture : APHYRIC TO MICROPHYRIC, VERY FINE-GRAINED TO COARSE-
GRAINED, VARIOLITIC (PLUMOSE);
Structure : VEINS ARE COMPOSED OF RED & BROWN & RED-BROWN &
GREENISH BROWN SMECTITE;
Comments : AN INCOMPLETE COOLING UNIT WHOSE BASE IS IN SEC 2
EXTENDS FROM 125-148CM, COLOR IS DARK GRAY TO DARK
BROWNISH GRAY;
Vesicles :
Location: Filling: COMBINE
DIKTYTAXITIC VUGS AT 137-142CM CONTAIN PHILLIPSITE
& MINOR ARAGONITE & CALCITE WITH TRACES OF
MN.OXIDE;
Phenocrysts: PLAGIOCLASE ( 1%)
PLAG & OLIVINE & AUGITE MICROPHENOCRYSTS ARE 1% OF
INTERVAL 137-142CM;
OLIVINE
MOSTLY ALTERED TO SMECTITE AND/OR CALCITE;
AUGITE
Replacement: SMECTITE
Minerals Replaced: OLIVINE
CALCITE
Minerals Replaced: OLIVINE
MANGANESE OXIDE
PHILLIPSITE
ARAGONITE
Leg : 34 Top/Bottom Interval(mm): 30/ 50 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 98.05
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 98.03
LITHOLOGY: SPARSELY MICROPHYRIC BASALT;
Piece No. : PCE 1 (3-5);
Texture : APHANITIC, 1% MICROPHENOCRYSTS UP TO 1MM LONG;
Structure : COMPLEX JOINT BLOCK WITH BROWN TO GREEN STAINED
JOINTS OF AT LEAST 4 ORIENTATIONS--FLAT TO VERTICAL,
ONE FLAT JOINT IS PARTLY COATED WITH DARK BROWN
RESINOUS SMECTITE & ANOTHER IS COATED WITH A LIGHT
TRANSLUCENT BLUE FILM;
Comments : DARK GRAY (2.5Y 3/0 OR 2.5/0);
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 60/ 90 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 98.09
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 98.06
LITHOLOGY: BASALT;
SIMILAR TO PCE 1;
Piece No. : PCE 2 (6-9);
Texture : SLIGHTLY COARSER-GRAINED THAN PCE 1;
Structure : SEVERAL JOINT ORIENTATIONS--VARIOUS ONES COATED
PARTLY BY DARK RED-STAINED SMECTITE & A LIGHT YELLOW
POWDERY MATERIAL (ALMOST ISOTROPIC - LIGHT BROWN TO
COLORLESS IN TRANSMITTED LIGHT) & A LIGHT BLUE FILM
AS IN PCE 1;
Comments : THE BLUE FILM IS FORMED OF BLADED CRYSTALS WITH LOW
FIRST ORDER GRAY INTERFERENCE COLORS AND (-)
ELONGATION (LENGTH FAST)--IT IS ASSOCIATED WITH AN
EARTHY CLAY WITH FIRST ORDER YELLOW TO RED
INTERFERENCE COLORS;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 110/ 170 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 98.17
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 98.11
LITHOLOGY: PLAG-OL SPARSELY MICROPHYRIC BASALT;
MASSIVE;
Piece No. : PCE 3 (11-17);
Texture : FINE-GRAINED, COARSER THAN PCES 1&2, UP TO 1%
MICROPHENOCRYSTS UP TO 6MM LONG;
Structure : ONE VERTICAL & ONE 25-DEGREE DIPPING JOINT--
OTHERWISE MASSIVE, THE VERTICAL JOINT IS COATED BY
LIGHT YELLOW CLAY SPOTTED WITH MN.OXIDE, THE 25-
DEGREE JOINT HAS INTERLAYERED YELLOW & RED BROWN
CLAY COATED BY A DRUSY VERY LIGHT TAN TRANSPARENT
LAYER OF COLORLESS PRISMS (PHILLIPSITE?);
Comments : DARK YELLOWISH GRAY (5Y 2.5/2);
Replacement: MANGANESE OXIDE
CLAY
Leg : 34 Top/Bottom Interval(mm): 200/ 270 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 98.27
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 98.20
LITHOLOGY: PLAG-OL SPARSELY MICROPHYRIC BASALT;
MASSIVE;
Piece No. : PCE 4 (20-27);
Texture : FINE-GRAINED, SPARSELY MICROPHYRIC;
Structure : ONE VERTICAL JOINT COATED WITH WHITE CALCITE, ONE
55-DEGREE DIPPING JOINT COATED WITH GREENISH YELLOW
& MINOR RED-BROWN CLAY WITH MN.OXIDE DENDRITES,
MASSIVE & UNJOINTED OTHERWISE;
Comments : DARK YELLOWISH GRAY TO BROWNISH GRAY, BROWN TO RED
SPOTS MAY BE ALTERED MESOSTASIS AND/OR OLIVINE;
Phenocrysts: PLAGIOCLASE ( 1%)
Size(mm): TO 0.6
OLIVINE
MAY INCLUDE OLIVINE;
Replacement: CALCITE
MANGANESE OXIDE
CLAY
Leg : 34 Top/Bottom Interval(mm): 290/ 370 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 98.37
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 98.29
LITHOLOGY: BASALT;
SIMILAR TO PCE 4;
Piece No. : PCE 5 (29-37);
Texture : COARSER-GRAINED THAN PCE 4 (MEDIUM TO COARSE-
GRAINED);
Structure : 35-DEGREE DIPPING JOINT ON TOP SURFACE COATED WITH
WAXY YELLOW-GREEN + EARTHY RED-BROWN CLAY, ANOTHER
35-DEGREE DIPPING JOINT ON BOTTOM SURFACE COATED
WITH DARK EARTHY YELLOW-BROWN MATERIAL, OTHERWISE
UNJOINTED;
Vesicles : RARE TINY DIKTYTAXITIC VUGS;
Replacement: CLAY
Leg : 34 Top/Bottom Interval(mm): 380/ 460 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 98.46
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 98.38
LITHOLOGY: BASALT OR DIABASE;
Piece No. : PCE 6 (38-46);
Texture : COARSE-GRAINED BASALT OR FINE-GRAINED DIABASE, MORE
UNIFORMLY TEXTURED THAN OVERLYING ROCKS, COARSEST
ROCK SEEN IN SECTION;
Structure : BROWN STAINED 30-DEGREE DIPPING JOINT WITH YELLOW-
BROWN DISCONTINUOUS STAIN & BLACK MN.OXIDE SPOTS ON
UPPER SURFACE, TIGHT DISCONTINUOUS CRACKS IN SEVERAL
PLACES;
Comments : IRREGULAR 20-DEGREE DIPPING SURFACE (SLIGHTLY
CRACKED ON ONE SIDE OF CORE) SEPARATES RELATIVELY
ALTERED DARK YELLOWISH GRAY ROCK ABOVE FROM FRESHER
DARK GRAY BASALT BELOW;
Vesicles : Size(mm): TO 1.5 Percent:
MINOR DIKTYTAXITIC VUGS--THE LARGEST HAS A BLUE
COATING AND OTHERS ARE UNALTERED;
Replacement: MANGANESE OXIDE
Leg : 34 Top/Bottom Interval(mm): 480/ 530 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 98.53
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 98.48
LITHOLOGY: SLIGHTLY MICROPHYRIC BASALT;
Piece No. : PCE 7 (48-53);
Texture : VERY SLIGHTLY FINER-GRAINED THAN PCE 6 BUT COARSER
THAN PCE 5, SLIGHTLY MICROPHYRIC;
Structure : UNJOINTED EXCEPT FOR ONE FLAT TIGHT DISCONTINUOUS
CRACK ABOUT 5 CM BELOW TOP, NO VEINS;
Comments : DARK GRAY;
Leg : 34 Top/Bottom Interval(mm): 550/ 590 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 98.59
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 98.55
LITHOLOGY: BASALT OR DIABASE;
MASSIVE;
Piece No. : PCE 8 (55-59);
Texture : COARSE-GRAINED BASALT OR VERY FINE-GRAINED DIABASE;
Structure : MASSIVE, UNJOINTED EXCEPT FOR TINY REMNANT ON FLAT
JOINT ON UPPER SURFACE COATED WITH LIGHT TO MEDIUM
YELLOW-BROWN CLAY;
Comments : DARK BROWNISH GRAY;
Replacement: CLAY
Leg : 34 Top/Bottom Interval(mm): 610/ 640 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 98.64
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 98.61
LITHOLOGY: BASALT;
Piece No. : PCE 9 (61-64);
Texture : SAME GRAIN SIZE AS PCE 8 OR SLIGHTLY COARSER, NO
VUGS;
Structure : SLAB BOUNDED BY A STEEPLY DIPPING (80 DEGREE) JOINT
WITH A 3CM BROWNISH ZONE OF ALTERATION NEXT TO IT--
THE NEXT HALF CM IS RELATIVELY FRESH;
Vesicles : Size(mm): Percent: 0
Leg : 34 Top/Bottom Interval(mm): 670/ 710 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 98.71
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 98.67
LITHOLOGY: BASALT;
Piece No. : PCE 10 (67-71);
Texture : SLIGHTLY FINER-GRAINED THAN PCE 9, NO VUGS;
Structure : UNJOINTED EXCEPT FOR ONE GREENISH BROWN-STAINED 35-
DEGREE DIPPING JOINT ON BOTTOM SURFACE WITH REMNANTS
OF LIGHT TAN CALCITE VEIN, SECOND JOINT SIMILAR TO
FIRST (BUT UNVEINED) NEAR THE BOTTOM BUT OF
DIFFERENT ORIENTATION;
Comments : STILL SOME DARK RED-BROWN SPOTS OF ALTERED
MESOSTASIS OR OLIVINE;
Vesicles : Size(mm): Percent: 0
Replacement: CALCITE
Leg : 34 Top/Bottom Interval(mm): 710/ 730 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 98.73
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 98.71
LITHOLOGY: BASALT;
MASSIVE;
Piece No. : PCE 11 (71-73);
Texture : COARSE-GRAINED - PERHAPS SLIGHTLY FINER-GRAINED THAN
PCE 10;
Structure : UNJOINTED, MASSIVE;
Comments : DARK BROWNISH GRAY;
Leg : 34 Top/Bottom Interval(mm): 770/ 810 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 98.81
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 98.77
LITHOLOGY: BASALT;
Piece No. : PCE 12 (77-81);
Texture : ANGULAR CORE FRAGMENT;
Structure : REMNANTS OF IRREGULAR STEEPLY TO MODERATELY DIPPING
JOINTS WITH YELLOWISH GREEN CLAY COATS, ONE JOINT
HAS RARE BLACK MN.OXIDE SPOTS AND CLUSTERS OF
STRIATED CONICAL "DOGTOOTH" CALCITE CRYSTALS OF A
TYPE SEEN ALSO IN THE EXPERIMENTAL MOHOLE BASALT -
THEY INDICATE DEPOSITION IN OPEN VEINS;
Replacement: CALCITE
CLAY
MANGANESE OXIDE
Comments : VISUAL DESCRIPTION FORM FOR PCE 13 IS MISSING FROM
ARCHIVES;
VISUAL DESCRIPTION FORM FOR PCE 14 IS MISSING FROM
ARCHIVES;
VISUAL DESCRIPTION FORM FOR PCE 15 IS MISSING FROM
ARCHIVES;
VISUAL DESCRIPTION FORM FOR PCE 16 IS MISSING FROM
ARCHIVES;
Leg : 34 Top/Bottom Interval(mm): 1040/1070 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 99.07
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 99.04
LITHOLOGY: PLAG-OL MICROPHYRIC BASALT;
Piece No. : PCE 17 (104-107);
Texture : MANY SMALL (TO 4CM) ANGULAR UNORIENTED FRAGMENTS OF
FINER & VERY FINE-GRAINED BASALT, MICROPHYRIC;
Comments : DARK GRAY, COOLING UNIT BOUNDARY BETWEEN PCES 17 &
18;
Phenocrysts: PLAGIOCLASE ( 1-2%)
Size(mm): TO 1
OLIVINE
Leg : 34 Top/Bottom Interval(mm): 1090/1150 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 99.15
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 99.09
LITHOLOGY: PLAG-OL MICROPHYRIC BASALT;
Piece No. : PCE 18 (109-115);
Texture : 3 REFITTED FRAGMENTS, 1% MICROPHENOCRYSTS UP TO 1MM
LONG, VERY FINE-GRAINED;
Structure : FRAGMENTS BOUNDED IN PART BY A VERTICAL AND A 55-
DEGREE DIPPING JOINT;
Comments : THE VERTICAL JOINT HAS A LIGHT YELLOW CLAY COATING &
SOME RED STAINS & RARE MN.OXIDE SPOTS, THE 55-DEGREE
DIPPING JOINT HAS A VERY THIN COATING OF AMBER
YELLOW SMECTITE WITH MINOR ADMIXED CALCITE & BLACK
MN.OXIDE SPOTS ON ITS SURFACE, THE ROCK IS DIFFERENT
FROM AND LIGHTER COLORED THAN ANY BASALT ABOVE, THE
COLOR DARKENS SLIGHTLY IN WHAT IS PRESUMED TO BE THE
DOWNWARD (INWARD) DIRECTION, SEE CORE 6-1 FOR THIN
SECTION INFORMATION, COLOR IS MEDIUM GRAY;
Vesicles : Size(mm): TO 1 Percent:
DIKTYTAXITIC VUGS;
Replacement: CALCITE
CLAY
SMECTITE
MANGANESE OXIDE
Leg : 34 Top/Bottom Interval(mm): 1170/1200 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 99.20
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 99.17
LITHOLOGY: PLAG-OL MICROPHYRIC BASALT;
Piece No. : PCE 19 (117-120);
Texture : MEDIUM-GRAINED, <1% MICROPHENOCRYSTS (MAXIMUM SIZE
1MM);
Structure : 45-DEGREE DIPPING JOINT ON THE LOWER SURFACE IS
COATED BY WAXY LIGHT GREEN-BROWN SMECTITE & REMNANT
PATCHES OF WHITE CALCITE;
Comments : MEDIUM TO DARK BROWNISH GRAY, LIGHT OLIVE RESINOUS
SPOTS MAY BE ALTERED OLIVINE;
Replacement: CALCITE
SMECTITE
Leg : 34 Top/Bottom Interval(mm): 1230/1260 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 99.26
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 99.23
LITHOLOGY: PLAG-OL MICROPHYRIC BASALT;
Piece No. : PCE 20 (123-126);
Texture : FOUR FRAGMENTS, MICROPHYRIC, FINE-GRAINED (FINER
THAN PCE 19);
Comments : DARK GRAY, COOLING UNIT BOUNDARY BETWEEN PCES 20 &
21;
Leg : 34 Top/Bottom Interval(mm): 1240/1350 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 99.35
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 99.24
LITHOLOGY: APHYRIC BASALT;
MASSIVE;
Piece No. : PCE 21 (124-135);
Texture : VIRTUALLY APHYRIC, MEDIUM TO COARSE-GRAINED
FRAGMENT;
Structure : UNFRACTURED, UNJOINTED, MASSIVE;
Comments : BARREL-SHAPED, DARK BROWNISH GRAY;
Leg : 34 Top/Bottom Interval(mm): 1370/1420 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 99.42
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 99.37
LITHOLOGY: PLAG-OL SPARSELY MICROPHYRIC BASALT;
Piece No. : PCE 22 (137-142);
Texture : ANGULAR, SLIGHTLY MICROPHYRIC, FINE-GRAINED
FRAGMENT;
Structure : JOINT AND FRACTURE-BOUNDED, FIVE JOINTS BELONGING TO
FOUR SETS ARE COATED WITH RED & BROWN & GREENISH
BROWN WAXY CLAY;
Comments : ONE REDDISH BROWN IRREGULAR CAVERNOUS "JOINT" IS
APPARENTLY IN PART AN OPEN VUG NOW SPARSELY LINED
WITH COLORLESS PRISMS (PHILLIPSITE?) & RARE MN.OXIDE
SPOTS & MINOR ARAGONITE & MINOR CALCITE, SLIGHT
COLOR ZONATION RELATED TO JOINTS, DARK BROWNISH
GRAY;
Vesicles :
Location: Filling: CLAY
DIKTYTAXITIC VUGS, ONE VUG FILLED WITH YELLOW
CLAY--OTHERS UNALTERED AND ALL ARE VERY SMALL;
Replacement: ARAGONITE
CALCITE
MANGANESE OXIDE
PHILLIPSITE
ZONED WITH RESPECT TO BIREFRINGENCE (GENERALLY
ISOTROPIC EDGES - FIRST ORDER GRAY INTERFERENCE
COLORS IN THE CORE);
CLAY
Leg : 34 Top/Bottom Interval(mm): 1440/1480 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 99.48
Core: 1 Top of Core Depth (m) : 98.00
Sect: 1 Top of Section Depth(m): 99.44
LITHOLOGY: PLAG-OL SPARSELY MICROPHYRIC BASALT;
Piece No. : PCE 23 (144-148);
Texture : FINE TO VERY FINE-GRAINED--SIMILAR TO PCE 22 OR
SLIGHTLY FINER, <1% MICROPHENOCRYSTS (0.6MM MAXIMUM
SIZE), NO VUGS PRESENT;
Structure : ONE VERTICAL JOINT AND ONE FLAT JOINT (=TOP SURFACE)
BOTH PARTIALLY COATED WITH BROWN TO RED-BROWN
RESINOUS SMECTITE;
Comments : STUCK IN CORE CATCHER AND BROKEN DURING DISLODGING
PROCESS, MEDIUM DARK GRAY, POSSIBLY PART OF THE SAME
COOLING UNIT AS PCE 22;
Vesicles : Size(mm): Percent: 0
NO VUGS PRESENT;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 0/ 0 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 99.60
Core: 1 Top of Core Depth (m) : 98.00
Sect: CC Top of Section Depth(m): 99.60
LITHOLOGY: BASALT;
Piece No. : PCE NO PIECE NUMBERS ASSIGNED;
Texture : CONTAINS SOME RELATIVELY CHILLED CRYSTALLINE BASALT-
EVIDENTLY CHILLED SELVAGES WERE DRILLED BUT NOT
RECOVERED IN THE CORE;
Structure : A DRUSY COLORLESS VEIN ON LIGHT TAN SMECTITE IS
MAINLY AN ISOTROPIC TO FAINTLY BIREFRINGENT MINERAL
(PROBABLY ANALCITE OR PHILLIPSITE--R.I.<1.480--SEE
SITE 319A-3-CC) ACCOMPANIED BY MINOR CALCITE &
ARAGONITE;
Groundmass : GLASS ( TR%)
Replacement: PALAGONITE
TAN TO ORANGE COLOR;
SMECTITE
CALCITE
ARAGONITE
Leg : 34 Top/Bottom Interval(mm): 0/ 300 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 107.80
Core: 2 Top of Core Depth (m) : 107.50
Sect: 1 Top of Section Depth(m): 107.50
LITHOLOGY: BASALT;
GLASS;
Piece No. : PCE 1 (1-5), 2 (7-9), 3 (10-15), 4 (17-24),
5 (26-30);
Texture : MEDIUM-GRAINED, APHANITIC, SPHERULITIC;
Structure : ONE CARBONATE VEIN IS PRESENT NEAR TOP OF SECTION,
FEW FRACTURES OR VEINS IN PCES 1-4;
Comments : LOWER PART OF A COOLING UNIT (THE UPPER PART OF
WHICH IS IN LOWER PART OF CORE 1) EXTENDS TO 30CM
DEPTH - IT GRADES FROM DARK GRAY MEDIUM-GRAINED
BASALT DOWNWARD THROUGH APHANITIC SPHERULITIC ROCK
TO BLACK GLASS WITH MINOR ORANGE-BROWN AND ONE FILM
OF COLORLESS PALAGONITE, THE STYROFOAM DIVIDERS
(EACH ABOUT 2CM WIDE) SEPARATE PIECES OF CORE THAT
ARE NOT PART OF A CONTINUOUS CORE SEGMENT - AN
UNKNOWN AMOUNT OF BASALT IS MISSING IN THE PLACES
WHERE THE STYROFOAM HAS BEEN ADDED;
Phenocrysts: PLAGIOCLASE
THE GLASS CONTAINS MICROPHENOCRYSTS OF PLAG &
OLIVINE & AUGITE;
OLIVINE
AUGITE
Groundmass : GLASS
Replacement: PALAGONITE
CARBONATE
SCATTERED CARBONATE CRYSTALS ON ONE SURFACE OF
PCE 1;
Leg : 34 Top/Bottom Interval(mm): 320/1500 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 109.00
Core: 2 Top of Core Depth (m) : 107.50
Sect: 1 Top of Section Depth(m): 107.82
LITHOLOGY: PLAG-OL SPARSELY PHYRIC BASALT;
DIABASE;
Piece No. : PCE 6 (33-39), 7 (41-45), 8 (48-53), 9 (55-58),
10 (60-66), 11 (68-71), 12 (73-78), 13 (80-82),
14 (84-89), 15 (90-92), 16 (94-101), 17 (101-115),
18 (115-120), 19 (120-137), 20 (137-148);
Texture : VERY FINE TO FINE-GRAINED, VARIOLITIC,
VESICULAR TO AMYGDALOIDAL ON A VERY FINE SCALE,
SPARSELY PHYRIC;
Structure : VEINS INCLUDE BLUE OR DARK GREEN OR LIGHT YELLOW-
GREEN SMECTITE & SULFIDE (IN LOWER PART OF SECTION)
& CALCITE & ARAGONITE;
Comments : ROCK GRADES PROGRESSIVELY FROM VERY FINE-GRAINED
VARIOLITIC BASALT TO FINE-GRAINED INTERGRANULAR AND
VARIOLITIC DIABASE, DARK GRAY, THIS IS THE TOP OF
THE THICKEST UNIT PENETRATED IN HOLE 319A (THE
BOTTOM OCCURRING IN CORE 3 SEC 5);
Vesicles : Size(mm): <1 Percent: TR
Location: Filling: SMECTITE
HOLLOW VESICLES LINED WITH GREEN OR DARK GRAY OR
RED OR BLUISH GRAY SMECTITE, SPARSE VESICLES AND
AMYGDULES;
Location: Filling: SMEC, PHIL, CARB,
Location: Filling: SULFIDE
AMYGDULES LINED BY SAME SMECTITE AS IN VESICLES &
THEIR CORES FILLED BY SMECTITE & PHILLIPSITE &
CARBONATE & SULFIDE ALONE OR IN COMBINATION,
SULFIDE CORES APPEAR ONLY LOW IN THE SECTION;
Phenocrysts: PLAGIOCLASE ( <1-1%)
OLIVINE
Replacement: SMECTITE
CARBONATE
SULFIDE
ARAGONITE
CALCITE
Leg : 34 Top/Bottom Interval(mm): 480/ 530 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 108.03
Core: 2 Top of Core Depth (m) : 107.50
Sect: 1 Top of Section Depth(m): 107.98
LITHOLOGY: PLAG SPARSELY PHYRIC BASALT;
Piece No. : PCE 8 (48-53);
Texture : FINE-GRAINED, VARIOLITIC, SPARSELY PHYRIC;
Vesicles : Size(mm): TO 2 Percent:
Location: Filling: SMECTITE
Shape : ROUND
VESICLES LINED WITH LIGHT GREEN TO BLUISH GRAY
SMECTITE (RED WHERE ALTERED), THEY ARE HOLLOW &
TOO ROUND TO BE DIKTYTAXITIC VUGS;
Phenocrysts: PLAGIOCLASE ( <1%)
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 550/ 580 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 108.08
Core: 2 Top of Core Depth (m) : 107.50
Sect: 1 Top of Section Depth(m): 108.05
LITHOLOGY: PLAG SPARSELY PHYRIC BASALT;
Piece No. : PCE 9 (55-58);
Comments : SAME AS PCE 8 BUT DARKER GRAY;
Vesicles :
Location: Filling: CALCITE
SOME VESICLES ARE LINED OR FILLED BY A COLORLESS
MINERAL INSTEAD OF THE MORE COMMON SMECTITE
LINING IN PCE 8, THE FILLINGS ARE MAINLY CALCITE +
A MINOR AMOUNT OF AN ISOTROPIC TO FAINTLY
BIREFRINGENT MINERAL (ANALCITE OR PHILLIPSITE?);
Replacement: CALCITE
Leg : 34 Top/Bottom Interval(mm): 600/ 660 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 108.16
Core: 2 Top of Core Depth (m) : 107.50
Sect: 1 Top of Section Depth(m): 108.10
LITHOLOGY: PLAG SPARSELY PHYRIC BASALT;
SAME LITHOLOGY AS PCES 8&9;
Piece No. : PCE 10 (60-66);
Structure : CARBONATE VEIN APPEARS ON ONE SURFACE (CONTAINS BOTH
CALCITE & ARAGONITE);
Comments : AN EARTHY BLUE COATING IN ONE SPOT ON ONE SURFACE;
Vesicles :
Location: Filling: SMECTITE
VESICLES ARE HOLLOW (SMECTITE-LINED);
Replacement: CALCITE
ARAGONITE
SMECTITE
Leg : 34 Top/Bottom Interval(mm): 680/ 710 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 108.21
Core: 2 Top of Core Depth (m) : 107.50
Sect: 1 Top of Section Depth(m): 108.18
LITHOLOGY: BASALT;
Piece No. : PCE 11 (68-71);
Texture : STILL A FINE-GRAINED VARIOLITIC BASALT;
Vesicles :
Location: Filling: HOLLOW
Shape : ROUND
VESICLES LINED BY LIGHT GREEN OR DARK
GRAY MATERIAL, RARELY FILLED WITH WHITE CORES;
Leg : 34 Top/Bottom Interval(mm): 730/ 780 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 108.28
Core: 2 Top of Core Depth (m) : 107.50
Sect: 1 Top of Section Depth(m): 108.23
LITHOLOGY: PLAG SPARSELY GLOMEROPHYRIC BASALT;
SIMILAR TO PCE 11;
Piece No. : PCE 12 (73-78);
Structure : IRREGULAR NON-PENETRATIVE CRACKS OF VARIOUS
ORIENTATIONS;
Vesicles : MANY OR MOST VESICLES NOW FILLED WITH WHITE
COMPLETE OR HOLLOW CORES - OFTEN WITH RADIAL
STRUCTURE, ONE 4MM-LONG VUG;
Phenocrysts: PLAGIOCLASE
SCATTERED PLAG + CPX (OR OLIVINE?) GLOMEROCRYSTS;
Leg : 34 Top/Bottom Interval(mm): 800/ 820 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 108.32
Core: 2 Top of Core Depth (m) : 107.50
Sect: 1 Top of Section Depth(m): 108.30
LITHOLOGY: PLAG SPARSELY GLOMEROPHYRIC BASALT;
SAME LITHOLOGY AS PCES 8-12;
Piece No. : PCE 13 (80-82);
Vesicles :
Location: Filling: SMECTITE
AMYGDULES MUCH LESS COMMON THAN ABOVE & FILLED
WITH DARK GREEN (OR LIGHT YELLOW GREEN WHERE
ALTERED) SMECTITE RATHER THAN WHITE MATERIAL;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 840/ 890 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 108.39
Core: 2 Top of Core Depth (m) : 107.50
Sect: 1 Top of Section Depth(m): 108.34
LITHOLOGY: PLAG SPARSELY GLOMEROPHYRIC BASALT;
SAME LITHOLOGY AS PCE 13;
Piece No. : PCE 14 (84-89);
Vesicles : VESICLES UNCOMMON, VARIABLY FILLED OR HOLLOW;
Leg : 34 Top/Bottom Interval(mm): 900/ 920 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 108.42
Core: 2 Top of Core Depth (m) : 107.50
Sect: 1 Top of Section Depth(m): 108.40
LITHOLOGY: PLAG SPARSELY GLOMEROPHYRIC BASALT;
SAME LITHOLOGY AS PCE 14;
Piece No. : PCE 15 (90-92);
Texture : PERHAPS SLIGHTLY COARSER THAN ABOVE;
Leg : 34 Top/Bottom Interval(mm): 940/1000 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 108.50
Core: 2 Top of Core Depth (m) : 107.50
Sect: 1 Top of Section Depth(m): 108.44
LITHOLOGY: PLAG SPARSELY GLOMEROPHYRIC BASALT;
SAME LITHOLOGY AS PCE 15;
Piece No. : PCE 16 (94-100);
Structure : FRACTURE ABOUT 20 DEGREES FROM VERTICAL;
Vesicles :
Location: Filling: SMECTITE
Shape : ROUND
HOLLOW SMECTITE-LINED VESICLES;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 1000/1500 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 109.00
Core: 2 Top of Core Depth (m) : 107.50
Sect: 1 Top of Section Depth(m): 108.50
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
MASSIVE;
Piece No. : PCE 17 (100-115), 18 (115-120), 19 (120-137),
20 (137-150);
Texture : FINE-GRAINED;
Structure : MASSIVE, UNIFORM, STEEPLY DIPPING VEIN IS VERTICAL
OVERALL BUT SOMEWHAT IRREGULAR IN DETAIL - IT CAN BE
TRACED THROUGH PCES 17-20 - AT THE TOP IT IS ALMOST
2MM THICK & COMPOSED OF INTERLAYERED WHITE
CALCITE(?) & DARK GREEN SMECTITE--BELOW THE MIDDLE
OF PCE 20 IT IS PURE SMECTITE - THE VEIN IS
ANASTOMOSING WHERE CALCITE IS PRESENT & A SINGLE
WELL-DEFINED VEIN WHERE IT IS WHOLLY SMECTITE,
GENTLY DIPPING CRACKS APPEAR BUT THEY ARE TIGHT &
COMMONLY DISCONTINUOUS & EITHER UNFILLED OR CONTAIN
ONLY A THIN SMECTITE OR CALCITE FILM, THE SMECTITE
VEINS CONTAIN YELLOW SULFIDES (AS IN A THIN
SUBSIDIARY CRACK IN PCE 20 FILLED BY TURQUOISE BLUE
SMECTITE);
Vesicles : Size(mm): TO 1 Percent:
Location: Filling: SMECTITE
Shape : ROUND
TINY AMYGDULES FILLED OR LINED BY DARK GREEN
SMECTITE - RARELY WITH A SULFIDE CORE;
Phenocrysts: PLAGIOCLASE ( TO 1%)
Size(mm): TO 3
Replacement: CALCITE
SMECTITE
SULFIDE
Leg : 34 Top/Bottom Interval(mm): 0/1500 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 110.50
Core: 2 Top of Core Depth (m) : 107.50
Sect: 2 Top of Section Depth(m): 109.00
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
Piece No. : PCE 1 (O-10), 2 (10-24), 3 (24-33), 4 (35-40),
5 (42-49), 6 (51-58), 7 (60-64), 8 (65-70),
9 (73-82), 10 (84-85), 11 (88-94), 12 (96-99),
13 (101-104), 14 (106-108), 15 (110-120),
16 (122-127), 17 (129-134), 18 (136-138),
19 (140-143), 20 (145-150);
Texture : UNIFORMLY FINE-GRAINED, SPARSELY PHYRIC;
Structure : GENERALLY UNJOINTED & UNVEINED BUT SMALL PIECE SIZE
& COMMONLY INTENSE BROWN STAINING INDICATE THAT THEY
ARE JOINT BLOCKS - THE PRESENT SURFACE OF WHICH WERE
NEAR THE NATURAL BOUNDING JOINTS, THE FEW CRACKS
OBSERVED ARE TIGHT & COMMONLY STAINED BY FE.OXIDE,
THE FEW VEINS SEEN--ALL OF WHICH ARE THIN TO VERY
THIN--ARE COMPOSED OF CARBONATE & GREEN OR YELLOW OR
BROWN SMECTITE - THE CARBONATE IS A MIXTURE OF
CALCITE & ARAGONITE IN SMALL VEIN REMNANTS AT 65CM
DEPTH, CROSSFIBER VEINS OF BOTH SMECTITE (INTERVAL
1-33CM) & CARBONATE (INTERVAL 145-150CM) ARE
PRESENT;
Comments : DARK BROWNISH GRAY TO DARK GRAY, THE FRESHEST ROCKS
WERE RECOVERED IN THE INTERVAL 110-127CM IN WHICH A
HORIZONTAL BROWNISH ALTERATION ZONE INDICATES THAT
THE TWO PIECES WERE SEPARATED BY A HORIZONTAL VEIN
OR JOINT, AT 134CM A SURFACE COATED BY CONICAL
CALCITE & MAGNESIAN CALCITE(?) CRYSTALS INDICATES AN
OPEN JOINT--IT COINCIDES WITH ESPECIALLY INTENSE
BROWN ALTERATION, STYROFOAM DIVIDERS EACH ABOUT 2CM
WIDE SEPARATE PIECES OF CORE THAT ARE NOT PART OF A
CONTINUOUS CORE SEGMENT - AN UNKNOWN AMOUNT OF
BASALT IS MISSING IN THE PLACES WHERE THE STYROFOAM
HAS BEEN ADDED;
Phenocrysts: PLAGIOCLASE ( 0-1%)
PHENOCRYSTS MOSTLY OR SOLELY PLAG, A 5MM LONG PLAG
FROM INTERVAL 51-58CM IS AN70-71 (TSUBOI METHOD);
Replacement: FERROUS OXIDE
CALCITE
ARAGONITE
SMECTITE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 0/ 330 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 109.33
Core: 2 Top of Core Depth (m) : 107.50
Sect: 2 Top of Section Depth(m): 109.00
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
Piece No. : PCE 1 (O-10), 2 (10-24), 3 (24-33);
Texture : FINE-GRAINED, AT BOTTOM OF PCE 3 THE GRAIN SIZE IS
SMALLER THAN IN PCE 2, SPARSELY PHYRIC;
Structure : ONE DISTINCTLY CROSS-FIBER GREEN SMECTITE VEIN AT
10-11CM IN PCE 2, PROMINENT STEEP VEINS WITH GENTLY
DIPPING BRANCHES;
Comments : STEEP VEINS ARE THE LOCI OF BROWNISH ALTERATION OF
THE OTHERWISE GRAY ROCK, DIRECT CONTINUATION OF THE
LOWER END OF SECTION 1;
Phenocrysts: PLAGIOCLASE ( 0.5%)
Size(mm): TO 2
PHENOCRYSTS SMALLER & SPARSER THAN SEC 2-1;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 350/ 400 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 109.40
Core: 2 Top of Core Depth (m) : 107.50
Sect: 2 Top of Section Depth(m): 109.35
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
SIMILAR TO PCES 1-3;
Piece No. : PCE 4 (35-40);
Structure : ONE FLAT-LYING DARK GREEN SMECTITE VEIN ON LOWER
SURFACE;
Alteration : BROWNER & MORE ALTERED THAN PCES 1-3;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 420/ 490 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 109.49
Core: 2 Top of Core Depth (m) : 107.50
Sect: 2 Top of Section Depth(m): 109.42
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
SIMILAR TO PCE 4;
Piece No. : PCE 5 (42-49);
Texture : FINE-GRAINED;
Structure : GENTLY TO MODERATELY DIPPING TIGHT CRACK, NO VEINS;
Alteration : ALTERED;
Phenocrysts: PLAGIOCLASE
MINOR PLAG PHENOCRYSTS;
Leg : 34 Top/Bottom Interval(mm): 510/ 580 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 109.58
Core: 2 Top of Core Depth (m) : 107.50
Sect: 2 Top of Section Depth(m): 109.51
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
SIMILAR TO PCE 5;
Piece No. : PCE 6 (51-58);
Texture : SPARSELY PHYRIC;
Structure : TIGHT CRACK, NO PROMINENT VEINS;
Alteration : EVEN MORE ALTERED THAN PCES 4&5;
Comments : FE.OXIDE STAINING;
Phenocrysts: PLAGIOCLASE
Size(mm): TO 5
X' ON CLEAVAGE FLAKE= 1.565 +,AN70-71,
PROBABLY NEAR-SURFACE PHENOS RATHER THAN
XENOCRYSTS OR DEEP-SEATED PHENOS WHICH ARE
MORE CALCIC THAN AN80 IN OCEANIC BASALTS;
Replacement: FERROUS OXIDE
Leg : 34 Top/Bottom Interval(mm): 600/ 640 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 109.64
Core: 2 Top of Core Depth (m) : 107.50
Sect: 2 Top of Section Depth(m): 109.60
LITHOLOGY: APHYRIC DIABASE;
SIMILAR TO PCE 6;
Piece No. : PCE 7 (60-64);
Texture : NO VISIBLE PHENOCRYSTS;
Structure : NO JOINTS OR VEINS;
Alteration : SOMEWHAT FRESHER THAN PCE 6, HIGHLY ABRADED ON ALL
SIDES;
Comments : SHAPED LIKE HALF A BARREL;
Leg : 34 Top/Bottom Interval(mm): 650/ 700 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 109.70
Core: 2 Top of Core Depth (m) : 107.50
Sect: 2 Top of Section Depth(m): 109.65
LITHOLOGY: APHYRIC BASALT;
SIMILAR TO PCE 7;
Piece No. : PCE 8 (65-70);
Texture : POSSIBLY FINER-GRAINED THAN PCE 7 (COARSE-GRAINED
BASALT RATHER THAN FINE-GRAINED DIABASE), PHENOCRYST
ABSENT OR SPARSE;
Structure : MINOR STEEP TO GENTLE CRACKS UNVEINED EXCEPT FOR
VERY THIN SMECTITE FILMS, TOP SURFACE CONTAINS TWO
LIGHT GRAY PATCHES OF A CALCITE & ARAGONITE VEIN;
Alteration : BROWNER & MORE ALTERED THAN PCE 7;
Replacement: SMECTITE
CALCITE
IN OILS CALCITE & ARAGONITE VEIN IS 5 DEGREES
BUT VARIABLE WITH SMALL BUT FINITE 2V - STRAINED
CALCITE OR INTERLAYERED CALCITE & ARAGONITE;
ARAGONITE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 730/ 820 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 109.82
Core: 2 Top of Core Depth (m) : 107.50
Sect: 2 Top of Section Depth(m): 109.73
LITHOLOGY: PLAG SPARSELY PHYRIC BASALT;
SIMILAR TO PCE 8;
Piece No. : PCE 9 (73-82);
Texture : MAY BE SLIGHTLY COARSER THAN PCE 8, SPARSELY PHYRIC;
Phenocrysts: PLAGIOCLASE ( 1%)
Leg : 34 Top/Bottom Interval(mm): 840/ 850 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 109.85
Core: 2 Top of Core Depth (m) : 107.50
Sect: 2 Top of Section Depth(m): 109.84
LITHOLOGY: BASALT;
SIMILAR TO PCE 9;
Piece No. : PCE 10 (84-85);
Texture : COARSER THAN PCE 9;
Comments : APPARENTLY WE HAVE ENTERED SECOND COOLING UNIT WITH
CONTACT SOMEWHERE NEAR PCES 7&8;
Leg : 34 Top/Bottom Interval(mm): 880/ 940 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 109.94
Core: 2 Top of Core Depth (m) : 107.50
Sect: 2 Top of Section Depth(m): 109.88
LITHOLOGY: BASALT;
SIMILAR TO PCE 10;
Piece No. : PCE 11 (88-94);
Structure : NO CRACKS OR VEINS;
Alteration : SLIGHTLY FRESHER THAN PCE 10;
Leg : 34 Top/Bottom Interval(mm): 960/ 990 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 109.99
Core: 2 Top of Core Depth (m) : 107.50
Sect: 2 Top of Section Depth(m): 109.96
LITHOLOGY: BASALT;
SIMILAR TO PCE 11;
Piece No. : PCE 12 (96-99);
Alteration : SLIGHTLY MORE ALTERED THAN PCE 11;
Leg : 34 Top/Bottom Interval(mm): 1010/1040 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 110.04
Core: 2 Top of Core Depth (m) : 107.50
Sect: 2 Top of Section Depth(m): 110.01
LITHOLOGY: PLAG SPARSELY PHYRIC BASALT;
SIMILAR TO PCE 12;
Piece No. : PCE 13 (101-104);
Texture : SPARSELY PHYRIC;
Structure : THREE JOINTS - ONE VERTICAL & 2 MODERATELY DIPPING -
2 HAVE REMNANTS OF YELLOW TO DARK BROWN SMECTITE
VEINS;
Phenocrysts: PLAGIOCLASE ( TO 1%)
Size(mm): TO 2
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 1060/1080 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 110.08
Core: 2 Top of Core Depth (m) : 107.50
Sect: 2 Top of Section Depth(m): 110.06
LITHOLOGY: BASALT;
SIMILAR TO PCE 13;
Piece No. : PCE 14 (106-108);
Alteration : CONSIDERABLY ALTERED TO A BROWN COLOR;
Comments : SMALLER FRAGMENT THAN OTHERS;
Leg : 34 Top/Bottom Interval(mm): 1100/1200 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 110.20
Core: 2 Top of Core Depth (m) : 107.50
Sect: 2 Top of Section Depth(m): 110.10
LITHOLOGY: DIABASE;
MASSIVE;
Piece No. : PCE 15 (110-120);
Texture : SAME GRAIN SIZE AS ABOVE (FINE-GRAINED DIABASE);
Structure : UNJOINTED, MASSIVE, UNVEINED;
Comments : FRESH & GRAY EXCEPT FOR TOP 1CM WHICH IS STRONGLY
RUST-COLORED;
Leg : 34 Top/Bottom Interval(mm): 1220/1270 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 110.27
Core: 2 Top of Core Depth (m) : 107.50
Sect: 2 Top of Section Depth(m): 110.22
LITHOLOGY: DIABASE;
SIMILAR TO PCE 15;
Piece No. : PCE 16 (122-127);
Comments : GRAY & FRESH EXCEPT FOR BOTTOM 1CM WHICH IS STRONGLY
RUST-COLORED, REMNANT OF LIGHT GREEN
EARTHY FILM ON UPPER SURFACE - IT APPEARS TO BE A
HIGHLY BIREFRINGENT FLAKY MINERAL;
Leg : 34 Top/Bottom Interval(mm): 1290/1340 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 110.34
Core: 2 Top of Core Depth (m) : 107.50
Sect: 2 Top of Section Depth(m): 110.29
LITHOLOGY: DIABASE;
Piece No. : PCE 17 (129-134);
Alteration : RUSTY, ALTERED;
Comments : ON UPPER SURFACE ARE A LIGHT BROWN FILM OF CROSS-
FIBER ARAGONITE & A SHEET COMPOSED OF RADIAL SPLAYS
OF ARAGONITE, THE LOWER SURFACE HAS SPOTTY CLUSTERS
OF CONICAL STRIATED CARBONATE CRYSTALS (COMPARE TO
319A-1-1 PCE12) - THEY INCLUDE CALCITE + SOME OTHER
RHOMBOHEDRAL(?) CARBONATE WITH HIGHER REFRACTIVE
INDICES THAN THOSE OF CALCITE (POSSIBLY MAGNESIAN
CALCITE - IT IS NOT DOLOMITE);
Replacement: CARBONATE
CALCITE
ARAGONITE
Leg : 34 Top/Bottom Interval(mm): 1360/1380 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 110.38
Core: 2 Top of Core Depth (m) : 107.50
Sect: 2 Top of Section Depth(m): 110.36
LITHOLOGY: DIABASE;
SIMILAR TO PCE 17;
Piece No. : PCE 18 (136-138);
Alteration : HIGHLY ALTERED (BROWN);
Comments : THIS IS A SMALL PIECE;
Leg : 34 Top/Bottom Interval(mm): 1400/1430 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 110.43
Core: 2 Top of Core Depth (m) : 107.50
Sect: 2 Top of Section Depth(m): 110.40
LITHOLOGY: DIABASE;
SIMILAR TO PCE 18;
Piece No. : PCE 19 (140-143);
Alteration : STRONG RUST COLOR;
Comments : THIS IS A SMALL PIECE;
Leg : 34 Top/Bottom Interval(mm): 1450/1500 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 110.50
Core: 2 Top of Core Depth (m) : 107.50
Sect: 2 Top of Section Depth(m): 110.45
LITHOLOGY: DIABASE;
SIMILAR TO PCE 19;
Piece No. : PCE 20 (145-150);
Texture : STILL FINE-GRAINED;
Alteration : STRONGLY RUSTY ALONG TWO STEEP CRACKS--AT TOP OF
SPECIMEN & ON ONE SIDE;
Comments : THIN FILMS OF SMECTITE &/OR CROSS-FIBER CARBONATE IN
THE CRACKS;
Replacement: CARBONATE
SMECTITE
Leg : 34 Top/Bottom Interval(mm): 0/1500 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 112.00
Core: 2 Top of Core Depth (m) : 107.50
Sect: 3 Top of Section Depth(m): 110.50
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
Piece No. : PCE 1 (3-14), 2 (16-20), 3 (22-26), 4 (28-32),
5 (32-37), 6 (38-43), 7 (45-49), 8 (51-56),
9 (57-60), 10 (62-65), 11 (67-70), 12 (72-79),
13 (79-82), 14 (84-92), 15 (94-100);
Texture : FINE-GRAINED--COARSENS NEAR 84CM TO FINE TO MEDIUM-
GRAINED;
Structure : THE CORE PIECES ARE HIGHLY ALTERED BROWNISH GRAY
JOINT BLOCKS WHICH INDICATES THAT SEC 3 IS FROM A
HIGHLY JOINTED & VEINED PORTION OF THE COOLING UNIT
AND THUS ACCOUNTS FOR THE POOR RECOVERY & SMALL
PIECES, VEINS ARE COMPOSED OF BROWN & RED-BROWN &
RARELY GREEN SMECTITE & CARBONATE--THE CARBONATE
DEFINITELY INCLUDES ARAGONITE IN SOME CASES EXAMINED
IN SMEAR SLIDES, FE.OXIDE IS A COMMON VEIN
CONSTITUENT WHICH LENDS THEIR COMMON BROWN TO RED
COLOR, ONE VEIN IN 38-43CM IS COMPOSED OF STELLATE
ARRAYS OF FINELY PRISMATIC ARAGONITE COATED BY DARK
BROWN OPAQUE MATERIAL & ALL SET IN A BASE OF
ORANGE-BROWN SMECTITE SUPERFICIALLY SIMILAR TO
PALAGONITE;
Comments : DARK BROWNISH GRAY, STYROFOAM DIVIDERS EACH ABOUT
2CM WIDE SEPARATE PIECES OF CORE THAT ARE NOT PART
OF A CONTINUOUS CORE SEGMENT - AN UNKNOWN AMOUNT OF
BASALT IS MISSING IN THE PLACES WHERE THE STYROFOAM
HAS BEEN ADDED;
Phenocrysts: PLAGIOCLASE
MEGASCOPIC PHENOCRYSTS ARE SPARSE;
Groundmass : PLAGIOCLASE
PYROXENE
OLIVINE
Replacement: FERROUS OXIDE
SMECTITE
CARBONATE
ARAGONITE
STELLATE ARAGONITE IS NOT UNCOMMON IN THE BASEMENT
FROM HOLE 319A - ESPECIALLY THE INTERIORS OF
RELATIVELY THICK COOLING UNITS BUT THE ONLY OTHER
OCCURRENCE OF COATED STELLATE CRYSTALS WAS SEEN IN
A THIN SECTION FROM 319A-34-7-1 (88-93CM);
Leg : 34 Top/Bottom Interval(mm): 0/ 140 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 110.64
Core: 2 Top of Core Depth (m) : 107.50
Sect: 3 Top of Section Depth(m): 110.50
LITHOLOGY: DIABASE;
Piece No. : PCE 1 (3-14);
Texture : FINE-GRAINED;
Structure : MINOR FLAT VEINS INCLUDING CARBONATE VEIN ON BOTTOM
SURFACE, IRREGULAR VERTICAL VEIN OF INTERLAYERED
CARBONATE & SMECTITE;
Alteration : STRONGLY RUST-COLORED FOR 1+CM ON EITHER SIDE OF
THE VERTICAL VEIN;
Replacement: CARBONATE
SMECTITE
Leg : 34 Top/Bottom Interval(mm): 160/ 320 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 110.82
Core: 2 Top of Core Depth (m) : 107.50
Sect: 3 Top of Section Depth(m): 110.66
LITHOLOGY: DIABASE;
SIMILAR TO PCE 1;
Piece No. : PCE 2 (16-20), 3 (22-26), 4 (28-32);
Structure : PCE 4 CONTAINS A PATCH OF CARBONATE ON MODERATELY
INCLINED VEIN;
Alteration : HIGHLY ALTERED TO A BROWN COLOR--PCE 4 SOMEWHAT
LESS ALTERED;
Replacement: CARBONATE
Leg : 34 Top/Bottom Interval(mm): 320/ 370 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 110.87
Core: 2 Top of Core Depth (m) : 107.50
Sect: 3 Top of Section Depth(m): 110.82
LITHOLOGY: DIABASE;
SIMILAR TO PCE 4;
Piece No. : PCE 5 (32-37);
Alteration : HIGHLY ALTERED ESPECIALLY NEAR ONE 50-DEGREE
DIPPING JOINT LINED BY DARK BROWN SMECTITE &
STRONGLY RUST-STAINED;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 380/ 430 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 110.93
Core: 2 Top of Core Depth (m) : 107.50
Sect: 3 Top of Section Depth(m): 110.88
LITHOLOGY: DIABASE;
SIMILAR TO PCE 5;
Piece No. : PCE 6 (38-43);
Structure : 2 FLAT TO GENTLY DIPPING JOINTS--ONE IS COATED BY
STELLATE ARRAYS OF PRISMS OF ARAGONITE & A DARK
BROWN OPAQUE MINERAL WITH ORANGE "PALAGONITE" BETWEEN THEM - THE DARK "PRISMS" MAY HAVE FORMED AS
COATINGS ON THE ARAGONITE (COMPARE 319A-7-1 PCE 10);
Alteration : ALTERED ESPECIALLY NEAR THE JOINTS;
Replacement: ARAGONITE
Leg : 34 Top/Bottom Interval(mm): 450/ 490 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 110.99
Core: 2 Top of Core Depth (m) : 107.50
Sect: 3 Top of Section Depth(m): 110.95
LITHOLOGY: DIABASE;
SIMILAR TO PCE 6;
Piece No. : PCE 7 (45-49);
Texture : SLIGHTLY COARSER THAN PCE 6;
Structure : ONE NON-PENETRATIVE GENTLY DIPPING CRACK;
Alteration : EXT;
Leg : 34 Top/Bottom Interval(mm): 510/ 700 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 111.20
Core: 2 Top of Core Depth (m) : 107.50
Sect: 3 Top of Section Depth(m): 111.01
LITHOLOGY: DIABASE;
SIMILAR TO PCE 7;
Piece No. : PCE 8 (51-56), 9 (57-60), 10 (62-65), 11 (67-70);
Structure : TWO WHITE CARBONATE VEINS DIPPING 50 DEGREES IN PCE
8, ONE MODERATELY DIPPING RUSTY CRACK IN PCE 9, 4
FLAT TO VERTICAL ARAGONITE-COATED JOINTS IN PCE 10,
ONE GENTLY DIPPING CARBONATE-COATED JOINT IN PCE 11;
Replacement: ARAGONITE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 720/ 790 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 111.29
Core: 2 Top of Core Depth (m) : 107.50
Sect: 3 Top of Section Depth(m): 111.22
LITHOLOGY: DIABASE;
Piece No. : PCE 12 (72-79);
Texture : FINE-GRAINED;
Structure : RUSTY GENTLY DIPPING TO FLAT JOINTS AT TOP & BOTTOM
ONLY ARE NON-PENETRATIVE;
Alteration : HIGHLY ALTERED (BROWN);
Leg : 34 Top/Bottom Interval(mm): 790/ 820 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 111.32
Core: 2 Top of Core Depth (m) : 107.50
Sect: 3 Top of Section Depth(m): 111.29
LITHOLOGY: DIABASE;
SIMILAR TO PCE 12;
Piece No. : PCE 13 (79-82);
Structure : GENTLY DIPPING JOINTS WHICH ARE RUSTY OR COATED WITH
BROWN SMECTITE;
Alteration : SLIGHTLY FRESHER THAN PCE 12;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 840/ 920 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 111.42
Core: 2 Top of Core Depth (m) : 107.50
Sect: 3 Top of Section Depth(m): 111.34
LITHOLOGY: DIABASE;
SIMILAR TO PCE 13;
Piece No. : PCE 14 (84-92);
Texture : SOMEWHAT COARSE (ALMOST MEDIUM-GRAINED DIABASE);
Structure : STEEP & GENTLY DIPPING RUSTY JOINTS WHICH ARE
SOMETIMES ZONALLY COLORED IN RED-BROWN & OLIVE GREEN
& DARK BROWN (THESE APPEAR TO BE COLOR VARIANTS OF
SMECTITE WITH EARTHY FE.OXIDE IN ADDITION IN THE
RED-BROWN AREAS);
Replacement: SMECTITE
FERROUS OXIDE
Leg : 34 Top/Bottom Interval(mm): 940/1000 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 111.50
Core: 2 Top of Core Depth (m) : 107.50
Sect: 3 Top of Section Depth(m): 111.44
LITHOLOGY: DIABASE;
Piece No. : PCE 15 (94-100);
Comments : SMALL LOOSE ALTERED FRAGMENTS;
Leg : 34 Top/Bottom Interval(mm): 0/ 0 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 112.10
Core: 2 Top of Core Depth (m) : 107.50
Sect: CC Top of Section Depth(m): 112.10
LITHOLOGY: GLASS;
PALAGONITE;
Groundmass : GLASS
Replacement: PALAGONITE
ORANGE;
Leg : 34 Top/Bottom Interval(mm): 0/1500 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 118.50
Core: 3 Top of Core Depth (m) : 117.00
Sect: 1 Top of Section Depth(m): 117.00
LITHOLOGY: APHYRIC TO PLAG SPARSELY PHYRIC DIABASE;
Piece No. : PCE 1 (2-6), 2 (8-11), 3 (13-18), 4 (20-24),
5 (26-35), 6 (37-40), 7 (42-45), 8 (47-55),
9 (55-63), 10 (65-70), 11 (72-84), 12 (86-89),
13 (98-101), 14 (103-106), 15 (108-115),
16 (116-124), 17 (126-137);
Texture : FINE TO MEDIUM-GRAINED, APHANITIC TO SPARSELY PHYRIC
Structure : ALTHOUGH UNJOINTED PIECES OF CORE DO OCCUR VEINS ARE
NOT UNCOMMON & SUGGEST THAT INCREASED FRESHNESS &
IMPROVED CORE RECOVERY ARE ONLY IN PART DUE TO A
DECREASE IN THE FREQUENCY (I.E. INCREASE IN SPACING)
OF JOINTS & VEINS, VEINS ARE COMPOSED OF BROWN &
GREEN & BLUE-GREEN & RARELY BLACK SMECTITE (BROWN
ONLY IN THE UPPER ALTERED PART OF THE SECTION) AND
FE.OXIDE (ABOVE 63CM) AND SULFIDE (BELOW 72CM) AND
CARBONATE, THE RECIPROCAL OCCURRENCE OF FE.OXIDE &
SULFIDE SUGGESTS THAT MUCH OF THE FE.OXIDE IN VEINS
& IN THE STAINED ROCK ADJACENT TO VEINS & JOINTS IN
ALTERED SECTIONS OF THE CORE MAY BE FROM THE
OXIDATION OF ORIGINAL PYRITE, ONE OF THE CARBONATE
VEINS AT ABOUT 86CM IS A CROSS-FIBER CALCITE VEIN;
Comments : DOWN TO 35CM THE ROCK IS DARK BROWNISH GRAY &
ALTERED, IN 35-53CM THE ROCK BECOMES PROGRESSIVELY
FRESHER, FROM 53-137CM THE ROCK IS FRESH DARK GRAY
MEDIUM-GRAINED DIABASE WHICH YIELDED GOOD CORE
RECOVERY IN LONG INTACT PIECES WHICH CAN COMMONLY BE
REFITTED OR--IF NOT--IN WHICH RECOGNIZABLE
STRUCTURES INDICATE LITTLE LOSS OF SECTION,
STYROFOAM DIVIDERS EACH ABOUT 2CM WIDE SEPARATE
PIECES OF CORE THAT ARE NOT PART OF A CONTINUOUS
CORE SEGMENT - AN UNKNOWN AMOUNT OF BASALT IS
MISSING FROM THE PLACES WHERE THE STYROFOAM HAS BEEN
ADDED;
Vesicles : Size(mm): TO 5 Percent:
Location: PCE 7 Filling:
DIKTYTAXITIC VUGS;
Phenocrysts: PLAGIOCLASE ( TR%)
Size(mm): TO 3X2
RECOGNIZABLE PLAG PHENOCRYSTS ARE PROMINENT BUT
OCCUR IN TRACE AMOUNTS AT MOST - OFTEN ONLY A
SINGLE RECOGNIZABLE CRYSTAL IN A GIVEN PIECE OF
CORE, MOSTLY SMALLER THAN 2X1MM;
Replacement: FERROUS OXIDE
SULFIDE
CARBONATE
CALCITE
SMECTITE
THE DISTRIBUTION OF BROWN & RED & YELLOW SMECTITE
IN THIS SECTION & THOSE HIGHER IN THE CORE
INDICATES THAT THEY ARE PROBABLY OXIDATION
PRODUCTS OF ORIGINALLY GREEN OR BLUE-GREEN
SMECTITE;
Leg : 34 Top/Bottom Interval(mm): 20/ 60 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 117.06
Core: 3 Top of Core Depth (m) : 117.00
Sect: 1 Top of Section Depth(m): 117.02
LITHOLOGY: DIABASE;
SIMILAR TO BOTTOM OF CORE 2;
Piece No. : PCE 1 (2-6);
Texture : FINE TO MEDIUM-GRAINED;
Structure : DARK BROWN SMECTITE ON GENTLY DIPPING FRACTURE ON
UPPER SURFACE;
Comments : DARK BROWN-GRAY;
Vesicles : Size(mm): TO 3 Percent:
IRREGULAR VUGS(?);
Phenocrysts: PLAGIOCLASE
Size(mm): 4X5
BROWN-STAINED PLAG CRYSTAL IS ONLY PHENOCRYST
SEEN,X' ON CLEAVAGES = 1.565 TO 1.567,
AN70-72;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 80/ 110 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 117.11
Core: 3 Top of Core Depth (m) : 117.00
Sect: 1 Top of Section Depth(m): 117.08
LITHOLOGY: DIABASE;
SIMILAR TO PCE 1;
Piece No. : PCE 2 (8-11);
Vesicles : NO VUGS;
Structure : BROWN SMECTITE ON ONE MODERATELY DIPPING JOINT (35
DEGREES);
Phenocrysts: PLAGIOCLASE
Size(mm): 3X2
ONLY ONE PLAG SEEN,X'=1.562+ TO 1.564+, MAINLY
1.562+,AN65-AN69 (MAINLY AN65),Z'=
1.566+ TO 1.570+ (MAINLY 1.568), AN64-72
(MAINLY AN67-AN68);
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 130/ 180 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 117.18
Core: 3 Top of Core Depth (m) : 117.00
Sect: 1 Top of Section Depth(m): 117.13
LITHOLOGY: DIABASE;
SIMILAR TO PCE 2;
Piece No. : PCE 3 (13-18);
Structure : UNFRACTURED, UNVEINED;
Phenocrysts: PLAGIOCLASE ( 0.1%)
Size(mm): TO 1X2
Leg : 34 Top/Bottom Interval(mm): 200/ 240 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 117.24
Core: 3 Top of Core Depth (m) : 117.00
Sect: 1 Top of Section Depth(m): 117.20
LITHOLOGY: APHYRIC DIABASE;
SIMILAR TO PCE 3;
Piece No. : PCE 4 (20-24);
Texture : SLIGHTLY FINER-GRAINED THAN PCE 3, NO PHENOCRYSTS;
Structure : DARK BROWN SMECTITE ON IRREGULAR JOINT ON BOTTOM
SURFACE;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 260/ 350 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 117.35
Core: 3 Top of Core Depth (m) : 117.00
Sect: 1 Top of Section Depth(m): 117.26
LITHOLOGY: ALTERED DIABASE;
Piece No. : PCE 5 (26-35);
Texture : MEDIUM-GRAINED, NO OR FEW PHENOCRYSTS;
Structure : 80-DEGREE DIPPING RUST-COLORED JOINT (IRREGULAR COAT
OF SMECTITE?)--SEVERAL DISCONTINUOUS JOINTS BRANCH
OFF IT & DIP 10 DEGREES OR LESS;
Comments : BROWN COLOR;
Leg : 34 Top/Bottom Interval(mm): 370/ 400 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 117.40
Core: 3 Top of Core Depth (m) : 117.00
Sect: 1 Top of Section Depth(m): 117.37
LITHOLOGY: DIABASE;
Piece No. : PCE 6 (37-40);
Texture : MEDIUM-GRAINED, ONE PLAG SEEN;
Structure : ONE VERTICAL & ONE GENTLY DIPPING SMECTITE-FILLED
JOINT, PATCH OF CARBONATE VEIN ON BOTTOM SURFACE;
Alteration : SOMEWHAT FRESHER THAN PCE 5;
Phenocrysts: PLAGIOCLASE
Size(mm): 1X2
ONE PLAG SEEN;
Replacement: CARBONATE
Leg : 34 Top/Bottom Interval(mm): 420/ 450 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 117.45
Core: 3 Top of Core Depth (m) : 117.00
Sect: 1 Top of Section Depth(m): 117.42
LITHOLOGY: DIABASE;
Piece No. : PCE 7 (42-45);
Structure : THREE TIGHT YELLOW-BROWN-STAINED 45 DEGREE DIPPING
JOINTS;
Alteration : SLIGHTLY FRESHER THAN PCE 6;
Vesicles : Size(mm): TO 5 Percent:
VUGS - LARGEST IS LINED BY BOTRYOIDAL BROWN
SMECTITE WITH GREEN SURFACE COAT--ANOTHER HAS DEEP
RED-BROWN-STAINED WALLS, MOST VUGS ARE UNALTERED,
ALL VUGS APPEAR DIKTYTAXITIC;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 470/ 550 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 117.55
Core: 3 Top of Core Depth (m) : 117.00
Sect: 1 Top of Section Depth(m): 117.47
LITHOLOGY: DIABASE;
Piece No. : PCE 8 (47-55);
Structure : TWO JOINTS DIP 30 DEGREES (TOP SURFACE & ONE IN
MIDDLE) - BOTH VEINED BY CARBONATE;
Comments : SAME AS PCE 7 EXCEPT AT LOWER END WHERE IT IS PARTLY
FRESH GRAY MEDIUM-GRAINED DIABASE IN WHICH ONE CAN
DISTINGUISH COLORLESS PLAGIOCLASE & BROWN
CLINOPYROXENE & PATCHES OF A DULL BLUISH GREEN
MINERAL WHICH IS PROBABLY OLIVINE (OR GROUNDMASS)
REPLACED BY SMECTITE--THE COARSENESS OF THE ROCK
SUGGESTS OLIVINE;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OLIVINE
Replacement: SMECTITE
Minerals Replaced: OLIVINE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 550/ 630 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 117.63
Core: 3 Top of Core Depth (m) : 117.00
Sect: 1 Top of Section Depth(m): 117.55
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
Piece No. : PCE 9 (55-63);
Texture : MEDIUM-GRAINED, TRACE OF PLAG PHENOCRYSTS;
Structure : UNJOINTED & UNVEINED EXCEPT FOR DENSE BROWN SMECTITE
UP TO 1MM THICK ON A PATCH OF RUSTY COLORED JOINT ON
THE UPPER SURFACE, A FLAT-LYING JOINT ON THE LOWER
SURFACE IS COATED BY A THIN LIGHT BLUE-GREEN
SMECTITE FILM;
Alteration : FRESH;
Comments : GRAY;
Phenocrysts: PLAGIOCLASE ( TR%)
TRACE OF RELATIVELY LARGE PLAG, MOST COMMON SIZE
IS 1X0.1MM;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 650/ 700 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 117.70
Core: 3 Top of Core Depth (m) : 117.00
Sect: 1 Top of Section Depth(m): 117.65
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
SIMILAR TO PCE 9;
Piece No. : PCE 10 (65-70);
Structure : REMNANT PATCH OF BLUE-GREEN COATED JOINT ON UPPER
SURFACE, TIGHT UNVEINED CRACK (DIPS 15 DEGREES) IN
LOWER PART IS NON-PENETRATIVE;
Leg : 34 Top/Bottom Interval(mm): 720/ 840 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 117.84
Core: 3 Top of Core Depth (m) : 117.00
Sect: 1 Top of Section Depth(m): 117.72
LITHOLOGY: DIABASE;
SIMILAR TO PCE 10;
Piece No. : PCE 11 (72-84);
Texture : ONE PLAG PHENOCRYST;
Structure : ONE 65 DEGREE-DIPPING JOINT INTERSECTS UPPER SURFACE
& SIDE - PARTIALLY COATED BY FINELY DRUSY YELLOW
SULFIDE & VERY THIN BLUE-GREEN FILM, 25 DEGREE-
DIPPING JOINT ON LOWER SURFACE HAS THIN BLUE-GREEN
PATCHY COAT;
Comments : COLOR NEAR (2.5Y 3/0);
Phenocrysts: PLAGIOCLASE
Size(mm): 3X2
ONE PHENOCRYST;
Replacement: SULFIDE
Leg : 34 Top/Bottom Interval(mm): 860/ 960 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 117.96
Core: 3 Top of Core Depth (m) : 117.00
Sect: 1 Top of Section Depth(m): 117.86
LITHOLOGY: APHYRIC DIABASE;
SIMILAR TO PCE 11;
Piece No. : PCE 12 (86-96);
Texture : APHYRIC;
Structure : UPPER SURFACE IS IN PART A 45 DEGREE-DIPPING JOINT
WITH COAT OF BLUE-GREEN SMECTITE & COLORLESS
CARBONATE & TRACE OF YELLOW SULFIDE - THE SMECTITE
IS DOMINANT & SHOWS A SHRINKAGE CRACK PATTERN - THE
CARBONATE IS FINELY DRUSY CROSS-FIBER CALCITE;
Replacement: SMECTITE
CALCITE
SULFIDE
Leg : 34 Top/Bottom Interval(mm): 980/1010 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 118.01
Core: 3 Top of Core Depth (m) : 117.00
Sect: 1 Top of Section Depth(m): 117.98
LITHOLOGY: DIABASE;
SIMILAR TO PCE 12;
Piece No. : PCE 13 (98-101);
Structure : UNFRACTURED SULFIDE PATCHES ON DARK GRAY JOINT
REMNANTS FORMING PART OF BOTTOM SURFACE;
Replacement: SULFIDE
Leg : 34 Top/Bottom Interval(mm): 1030/1060 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 118.06
Core: 3 Top of Core Depth (m) : 117.00
Sect: 1 Top of Section Depth(m): 118.03
LITHOLOGY: APHYRIC DIABASE;
SIMILAR TO PCE 13;
Piece No. : PCE 14 (103-106);
Texture : APHYRIC;
Structure : UNFRACTURED, REMNANT OF FLAT JOINT ON UPPER SURFACE
PATCHILY COATED BY CARBONATE & YELLOW SULFIDE;
Replacement: SULFIDE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 1080/1150 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 118.15
Core: 3 Top of Core Depth (m) : 117.00
Sect: 1 Top of Section Depth(m): 118.08
LITHOLOGY: DIABASE;
SIMILAR TO PCE 14;
Piece No. : PCE 15 (108-115);
Structure : ONE VERTICAL & ONE 60-DEGREE-DIPPING JOINT--BOTH
WITH IRREGULAR ROUGH SURFACES--ARE FAINTLY COATED
WITH BLUE-GREEN SMECTITE, A 70-DEGREE-DIPPING JOINT
CONTAINS A 0.1MM-THICK DARK GREEN SMECTITE VEIN;
Alteration : RARE RUST SPOTS IN THE ROCK SUGGEST OXIDIZED
SULFIDE GRAINS;
Replacement: SULFIDE
SMECTITE
Leg : 34 Top/Bottom Interval(mm): 1160/1240 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 118.24
Core: 3 Top of Core Depth (m) : 117.00
Sect: 1 Top of Section Depth(m): 118.16
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
SIMILAR TO PCE 15;
Piece No. : PCE 16 (116-124);
Texture : SPARSELY PHYRIC;
Structure : UNFRACTURED EXCEPT FOR ONE VERTICAL ANASTOMOSING
JOINT FILLED WITH VIRTUALLY BLACK PITCH-LIKE
SMECTITE VEIN + MINOR SULFIDE, A PARALLEL IRREGULAR
JOINT 1MM AWAY HAS A LIGHT BLUE-GREEN SMECTITE FILM;
Comments : BARREL-SHAPED;
Phenocrysts: PLAGIOCLASE ( TR%)
Size(mm): TO 1X1.5
Replacement: SMECTITE
SULFIDE
Leg : 34 Top/Bottom Interval(mm): 1260/1370 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 118.37
Core: 3 Top of Core Depth (m) : 117.00
Sect: 1 Top of Section Depth(m): 118.26
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
SIMILAR TO PCE 16;
Piece No. : PCE 17 (126-137);
Structure : UNJOINTED EXCEPT FOR TOP SURFACE WHICH IS A 40
DEGREE DIPPING JOINT WITH A DISCONTINUOUS LIGHT BLUE
GREEN SMECTITE FILM & RARE PATCHES OF YELLOW
SULFIDE;
Phenocrysts: PLAGIOCLASE ( TR%)
Size(mm): TO 3.5X2
PHENO CORE R.I.= 1.569-1.573 (MAINLY 1.572),
AN77-85 (MAINLY AN83-84), X' ON CLEAVAGE
FLAKES;
Replacement: SMECTITE
SULFIDE
Leg : 34 Top/Bottom Interval(mm): 0/ 0 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 126.10
Core: 3 Top of Core Depth (m) : 117.00
Sect: CC Top of Section Depth(m): 126.10
LITHOLOGY: GLASS;
PALAG (ORANGE BROWN) IN TRACE AMOUNTS;
Piece No. : NO PCE NUMBERS;
Structure : VEIN - COLORLESS, ABOUT 1+ MM THICK CONTAINING
CALCITE AND MINOR ARAGONITE,COLORLESS VEIN
INTERLAYERED ON PALAG - PHILLIPSITE OR ANALCITE
(ALMOST WHOLLY ISOTROPIC, R.I. > 1.420,
<1.486,PROBABLY ABOUT 1.482), PLUS MINOR CARB
(INCLUDES SOME ARAGONITE);
Vesicles : Size(mm): 0.4 Percent:
Location: Filling:
Shape : ROUND
FILLING WHITE - PHILLIPSITE OR ANALCITE
(ISOTROPIC TO 1ST ORDER GRAY INTERFERENCE
COLORS), R.I. < 1.480;
Replacement: CALCITE
Size(mm): VEIN
ARAGONITE
Size(mm): VEIN
CARBONATE
Size(mm): VEIN
ANALCITE
Size(mm): VEINS,
Size(mm): VESICLES
PHILLIPSITE
Size(mm): VEINS,
Size(mm): VESICLES
Leg : 34 Top/Bottom Interval(mm): 0/1500 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 120.00
Core: 3 Top of Core Depth (m) : 117.00
Sect: 2 Top of Section Depth(m): 118.50
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
Piece No. : PCE 1 (0-20), 2 (22-26), 3 (26-41), 4 (44-47),
5 (49-54), 6 (56-58), 7 (59-64), 8 (66-74),
9 (74-81), 10 (81-86), 11 (86-95), 12 (95-113),
13 (113-117), 14 (117-132), 15 (132-147);
Texture : MEDIUM-GRAINED, AMYGDALOIDAL, OPHITIC;
Structure : VEINS INCLUDE BROWN SMECTITE & CARBONATE IN THE
ALTERED ROCK, THE INTERMEDIATE ALTERED ZONE
CORRELATES LARGELY WITH A STEEP TO VERTICAL
COMPLEX BRANCHING VEIN WHICH CAN BE TRACED FROM 66
TO 117CM - THE UPPER PART OF THIS VEIN IS IN PART
CALCITE WITH OPEN DRUSES WHICH INDICATE FILLING OF
AN OPEN JOINT;
Alteration : FRESH
0-41CM, VEINS HERE APPARENTLY OCCURRED UNDER NON-
OXIDIZING CONDITIONS - LATER OXIDATION DESTROYED
SULFIDES & ALTERED THE SMECTITE TO A BROWN COLOR;
MOD
41-117CM, THE VUGS IN 56-64CM MAY ACCOUNT IN PART
FOR INTENSE ALTERATION THERE;
FRESH TO MOD
117-147CM;
Comments : ROCK IS DARK GRAY TO 41CM & BROWNISH FROM 41-117CM,
THE OPHITIC TEXTURE IS MUCH LIKE THAT IN SECS 2-3 &
3-1 WITH THE ADDITION THAT RELICT ORANGE-BROWN
IDDINGSITE RIMS WHICH OCCUR IN AT LEAST 127-130CM
SERVE TO OUTLINE & CONFIRM THE IDENTIFICATION OF
SMECTITE PSEUDOMORPHS AFTER OLIVINE & CLEARLY
DEMONSTRATE THEIR LARGE TO SMALL GRAIN SIZES & THEIR
FORMATION THROUGHOUT ALMOST THE WHOLE
CRYSTALLIZATION HISTORY OF THE MAGMA, THE VEINS &
VUGS INDICATE THAT THE ALTERED ZONE CORRELATES WITH
A ZONE OF HIGH POROSITY & PERMEABILITY, VEINS IN THE
FRESHER PART OF THE SECTION ARE DARK GREEN & BLUE-
GREEN PSEUDOMORPHS AFTER OLIVINE & MESOSTASIS IN THE
HOST ROCK--THUS INDICATING THAT VEIN DEPOSITION WAS
CONCURRENT WITH HOST ROCK ALTERATION & AMYGDULE
FILLING, STYROFOAM DIVIDERS EACH ABOUT 2CM WIDE
SEPARATE PIECES OF CORE THAT ARE NOT PART OF A
CONTINUOUS CORE SEGMENT - AN UNKNOWN AMOUNT OF
BASALT IS MISSING FROM THE PLACES WHERE THE
STYROFOAM HAS BEEN ADDED;
Vesicles :
Location: PCES 2&3 Filling: SMECTITE, SULFIDE
AMYGDULES IN THE FRESH ROCK ARE BLUE-GREEN
SMECTITE & IN SOME CASES HAVE SULFIDE CORES;
Location: PCES 4&5 Filling: SMECTITE
AMYGDULES IN THE ALTERED INTERVAL ARE BROWN
SMECTITE;
Size(mm): TO 6 Percent:
Location: PCES 6&7 Filling: SMECTITE
DIKTYTAXITIC VUGS IN PART LINED WITH BOTRYOIDAL
BROWN SMECTITE;
Phenocrysts: PLAGIOCLASE ( TR%)
Size(mm): TO 2X2
MAXIMUM SIZES FROM 2X2 TO 5X1.5MM;
Groundmass : OLIVINE
Replacement: IDDINGSITE
CARBONATE
SMECTITE
Minerals Replaced: OLIVINE
SULFIDE
CALCITE
Leg : 34 Top/Bottom Interval(mm): 10/ 200 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 118.70
Core: 3 Top of Core Depth (m) : 117.00
Sect: 2 Top of Section Depth(m): 118.51
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
MASSIVE;
Piece No. : PCE 1 (1-20);
Texture : MEDIUM-GRAINED;
Structure : MASSIVE, UNFRACTURED, PART OF AN IRREGULAR & ALMOST
FLAT JOINT ON BOTTOM SURFACE IS PARTLY COATED WITH
YELLOW SULFIDE;
Comments : COLOR IS DARK GRAY (BETWEEN 2.5Y 2.5/0 & 2.5Y 3/0);
Phenocrysts: PLAGIOCLASE ( TR%)
Size(mm): TO 5X1.5
Groundmass : PYROXENE
LIGHT BROWN;
PLAGIOCLASE
COLORLESS;
OLIVINE
BLUE-GREEN PSEUDOMORPHS AFTER OLIVINE(?);
Replacement: SULFIDE
Leg : 34 Top/Bottom Interval(mm): 220/ 410 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 118.91
Core: 3 Top of Core Depth (m) : 117.00
Sect: 2 Top of Section Depth(m): 118.72
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
SAME LITHOLOGY AS PCE 1;
Piece No. : PCE 2 (22-26), 3 (26-41);
Structure : 20 DEGREE DIPPING JOINTS ON TOP SURFACE & 4CM DOWN -
TOP SURFACE COATED WITH DENSE DARK GREEN RESINOUS
SMECTITE & LIGHT BLUE-GREEN SMECTITE ETCHED IN SUCH
A WAY AS TO SEEM TO BE A CROSS-FIBER VEIN - TOGETHER
THESE TWO TYPES MAY HAVE BEEN A ZONED VEIN, THE LOWE
JOINT IS COATED WITH YELLOW SULFIDE + CARBONATE, AN
IRREGULAR VERTICAL JOINT RUNNING THE LENGTH OF THE
SPECIMEN INCLUDES A THIN VEIN OF DULL GRAYISH BLUE-
GREEN SMECTITE WHICH ANASTOMOSES SOMEWHAT;
Alteration : IN LOWER PART OF SPECIMEN THE MAIN VEIN & STEEP TO
GENTLY DIPPING BRANCHES ARE OXIDIZED RED-BROWN &
THE ADJACENT ROCK IS STAINED BROWN;
Comments : RARE YELLOW SULFIDE GRAINS IN THE BLUE-GREEN
SMECTITE GRAINS IN THE MAIN ROCK;
Phenocrysts: PLAGIOCLASE ( TR%)
Size(mm): TO 2X2
Replacement: SMECTITE
SULFIDE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 440/ 540 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 119.04
Core: 3 Top of Core Depth (m) : 117.00
Sect: 2 Top of Section Depth(m): 118.94
LITHOLOGY: DIABASE;
Piece No. : PCE 4 (44-47), 5 (49-54);
Texture : MEDIUM-GRAINED;
Structure : VERTICAL & GENTLY DIPPING FRACTURES, NO VEINS;
Comments : BROWN, ALTERED;
Vesicles : Size(mm): <1 Percent:
Location: Filling:
Shape : ROUND
ONE ROUND TAN AMYGDULE IN PCE 5;
Phenocrysts: PLAGIOCLASE
Size(mm): TO 4X1.5
Leg : 34 Top/Bottom Interval(mm): 560/ 580 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 119.08
Core: 3 Top of Core Depth (m) : 117.00
Sect: 2 Top of Section Depth(m): 119.06
LITHOLOGY: DIABASE;
SAME LITHOLOGY AS PCES 4&5;
Piece No. : PCE 6 (56-58);
Structure : CARBONATE VEINS ON UPPER SURFACE ARE ALMOST FLAT-
LYING;
Vesicles : Size(mm): TO 6 Percent:
VUGS ON LOWER SURFACE THAT ARE APPARENTLY
DIKTYTAXITIC BUT POSSIBLY DUE TO SELECTIVE
ALTERATION OF SOME CONSTITUENTS;
Replacement: CARBONATE
Leg : 34 Top/Bottom Interval(mm): 590/ 640 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 119.14
Core: 3 Top of Core Depth (m) : 117.00
Sect: 2 Top of Section Depth(m): 119.09
LITHOLOGY: ALTERED DIABASE;
SAME LITHOLOGY AS PCE 6;
Piece No. : PCE 7 (59-64);
Structure : NO VEINS OR JOINTS;
Vesicles : Size(mm): TO 5 Percent:
LOCALLY ABUNDANT LARGE DIKTYTAXITIC VUGS WITH
EXPOSED PLAG PLATES & OPAQUE OCTAHEDRA & PYROXENE
PRISMS & GRAINS, ONE VUG LINED BY BOTRYOIDAL BROWN
SMECTITE;
Groundmass : PYROXENE
PLAGIOCLASE
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 660/1470 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 119.97
Core: 3 Top of Core Depth (m) : 117.00
Sect: 2 Top of Section Depth(m): 119.16
LITHOLOGY: DIABASE;
MASSIVE;
Piece No. : PCE 8 (66-74), 9 (74-82), 10 (82-86), 11 (86-95),
12 (95-113), 13 (113-118), 14 (118-132),
15 (132-147);
Texture : MEDIUM-GRAINED;
Structure : MASSIVE, PROMINENT 0.5-1+MM VEIN IS VERTICAL OVERALL
& IRREGULAR & LOCALLY ANASTOMOSING IN DETAIL - IT
EXTENDS FROM TOP TO 109CM, AT TOP THE VEIN IS
CALCITE WITH NUMEROUS OPEN LENTICULAR DRUSY HOLES,
BELOW 83CM THE VEIN BRANCHES - ONE BRANCH IS MAINLY
CARBONATE THAT HORSETAILS AT 93CM & ENDS (LEAVES
THE CORE) AT 107CM BUT IS STILL VUGGY & MIXED WITH
SMECTITE AT LOWER END - THE OTHER BRANCH IS A 0.5MM
DARK SMECTITE VEIN THAT INTERSECTS THE SIDE OF THE
CORE AT 117CM--IT NARROWS PROGRESSIVELY DOWNWARD,
BRANCHES FROM THE MAIN VEINS ARE FLAT TO STEEP & ARE
OF THE SAME MINERALOGIES AS THE MAIN VEINS FROM
WHICH THEY BRANCH (CALCITE OR SMECTITE);
Comments : BROWN & ALTERED TO 117CM--BOTH RELATIVELY FRESH
(GRAY) & ALTERED (BROWN) BELOW THAT DEPENDING ON
PROXIMITY TO CRACKS & VEINS;
Phenocrysts: PLAGIOCLASE ( TR%)
Size(mm): 4X4
IN PCE 15 AT 138.5CM: 4X4MM, X'=1.564+ TO
1.570+,MAINLY 1.566+ (AN69-80+),MAINLY AN72,
Z'=MAX = 1.572,AN73-74 AND LESS, APPARENTLY
SOME GROUNDMASS PLAG INCLUDED AS WELL AS THE
ZONED EDGE OF THE PHENOCRYST, PHENO NOT WELL
FORMED;
Replacement: CALCITE
SMECTITE
Leg : 34 Top/Bottom Interval(mm): 0/1500 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 121.50
Core: 3 Top of Core Depth (m) : 117.00
Sect: 3 Top of Section Depth(m): 120.00
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
Piece No. : PCE 1 (0-19), 2 (21-23), 3 (25-43), 4 (45-62),
5 (62-79), 6 (82-94), 7 (94-104), 8 (104-115),
9 (115-131), 10 (132-146);
Texture : MEDIUM-GRAINED, NO VUGS OR OPEN SPACES, SPARSELY
PHYRIC;
Structure : LARGE PORTIONS OF THE CORE ARE UNJOINTED & UNVEINED
(FOR INSTANCE PCES 2&10), ONLY ONE JOINT IS SEEN IN
PCE 3, OBSERVED VEINS ARE DARK GREEN & BLUE-GREEN &
BROWN SMECTITE & CALCITE;
Comments : SIMILAR TO SEC 2, TO A DEPTH OF 74CM THERE IS A
MIXTURE OF FRESH DARK GRAY & ALTERED DARK BROWNISH
GRAY ROCK--THE BROWN ALTERED PARTS ARE NOT RELATED
TO VISIBLE JOINTS OR VEINS BUT THESE PRESUMABLY LAY
NOT FAR OUTSIDE THE PRESENT CORE WHICH EVIDENTLY
PENETRATED LARGE BLOCKS BOUNDED BY WIDELY SPACED
JOINTS THUS YIELDING GOOD CORE RECOVERY IN LARGE
PIECES WHICH ARE READILY REFITTED, BELOW 74CM THE
ROCK IS WHOLLY DARK & FRESH, IN AT LEAST TWO PLACES
THE SHARP DIFFUSION-CONTROLLED CONTACTS BETWEEN
ALTERED ROCK & FRESH GRAY ROCK CROSSCUT SMECTITE
VEINS & THE VEINS ARE BROWN OR GREEN TO BLUE-GREEN
ACCORDING TO THE DEGREE OF ALTERATION OF THE LOCAL
HOST ROCK - THIS FACT DEMONSTRATES AS IN
CORE 319-1-1 THAT THE OXIDATIVE ALTERATION &
STAINING POSTDATE VEIN DEPOSITION - IN PCE 1 THE
BROWN STAINING ADVANCED ON EITHER SIDE OF A CROSSCUT
SMECTITE VEIN ABOUT 2-3CM AHEAD OF ITS POSITION IN
THE HOST DIABASE MORE REMOVED FROM THE VEIN - THIS
VEIN APPEARS TO HAVE BEEN MORE PERMEABLE THAN THE
ROCK AS A WHOLE BUT SUCH IS NOT ALWAYS THE CASE,
STYROFOAM DIVIDERS EACH ABOUT 2CM WIDE SEPARATE
PIECES OF CORE THAT ARE NOT KNOWN TO BE PART OF A
CONTINUOUS CORE SEGMENT - AN UNKNOWN AMOUNT OF
BASALT IS MISSING FROM THE PLACES WHERE THE
STYROFOAM HAS BEEN ADDED;
Phenocrysts: PLAGIOCLASE ( 0-1%)
Size(mm): TO 3X2&6X2
Groundmass : OLIVINE
BLUE-GREEN SMECTITE PSEUDOMORPHS AFTER OLIVINE ARE
SCATTERED THROUGHOUT THE SECTION;
Replacement: CALCITE
SMECTITE
Minerals Replaced: OLIVINE
Leg : 34 Top/Bottom Interval(mm): 0/ 190 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 120.19
Core: 3 Top of Core Depth (m) : 117.00
Sect: 3 Top of Section Depth(m): 120.00
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
Piece No. : PCE 1 (0-19);
Texture : MEDIUM-GRAINED;
Structure : A 0.8MM-THICK DARK GREEN SMECTITE VEIN LOCALLY
INTERLAYERED WITH CALCITE DIPS 80 DEGREES - NEAR THE
TOP VERY FINE SMECTITE-FILLED CRACKS BRANCH OFF IT
IN SEVERAL DIRECTIONS, THE MAIN VEIN CROSS-CUTS THE
BROWN ALTERATION OF THE HOST ROCK & IN THAT PART OF
THE ROCK HAS RUSTY BROWN WALLS WHEREAS IT IS WHOLLY
GREEN IN THE FRESH ROCK - THE ALTERATION POSTDATES
THE VEIN & WAS NOT CONTROLLED BY IT - DARK GREEN
PATCHES ON THE UPPER SURFACE INDICATE IT IS IN PART
A FLAT JOINT;
Comments : BROWN & MORE THAN HALF ALTERED TO FRESH GRAY;
Phenocrysts: PLAGIOCLASE ( 1%)
Size(mm): TO 4X3
Replacement: SMECTITE
CALCITE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 210/ 230 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 120.23
Core: 3 Top of Core Depth (m) : 117.00
Sect: 3 Top of Section Depth(m): 120.21
LITHOLOGY: DIABASE;
Piece No. : PCE 2 (21-23);
Structure : NO VEINS OR JOINTS;
Alteration : FRESH;
Comments : GRAY, ABRADED ON ALL SIDES;
Leg : 34 Top/Bottom Interval(mm): 250/ 430 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 120.43
Core: 3 Top of Core Depth (m) : 117.00
Sect: 3 Top of Section Depth(m): 120.25
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
Piece No. : PCE 3 (25-43);
Texture : MEDIUM-GRAINED;
Structure : NO VEINS OR MAJOR JOINTS, ONE TIGHT NON-PENETRATIVE
MODERATELY DIPPING CRACK CROSS-CUTS THE FRESH-
ALTERED CONTACT;
Comments : 40% GRAY & 60% BROWN ALTERED;
Phenocrysts: PLAGIOCLASE ( TR%)
Size(mm): TO 1X4
Leg : 34 Top/Bottom Interval(mm): 430/ 790 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 120.79
Core: 3 Top of Core Depth (m) : 117.00
Sect: 3 Top of Section Depth(m): 120.43
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
SIMILAR TO PCE 3;
Piece No. : PCE 4 (43-62), 5 (62-79);
Structure : SEVERAL FLAT TO MODERATELY DIPPING JOINTS & THIN
SMECTITE VEINS CROSS-CUT THE FRESH-ALTERED CONTACT &
(AS IN PCE 3) THEIR DEGREE OF ALTERATION PARALLELS
THAT OF THE HOST SO THEY PREDATE & DID NOT CONTROL
THE RUSTY ALTERATION;
Comments : BROWN ALTERED ROCK DISAPPEARS AT 74CM & LOWER PART
OF PCE 5 IS WHOLLY GRAY;
Phenocrysts: PLAGIOCLASE ( 1%)
Size(mm): TO 3X5
IN PCE 4 AT 49CM: 3X5MM ("SKELETAL" - ABUNDANT
V.F.GRAINED INCLUSIONS-PROBABLY PHENO CORES),
X'= 1.568+ TO 1.574 (RANGE AN76-88), MAINLY
1.570-1.573 (AN80-86);
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 820/1310 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 121.31
Core: 3 Top of Core Depth (m) : 117.00
Sect: 3 Top of Section Depth(m): 120.82
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
Piece No. : PCE 6 (82-94), 7 (94-104), 8 (104-115), 9 (115-131);
Structure : SPARSE STEEPLY TO MODERATELY DIPPING PENETRATIVE &
NON-PENETRATIVE CRACKS WITH OR WITHOUT A BLUE-GREEN
SMECTITE VEIN, PCE 8 HAS NO CRACKS, A VERTICAL VEIN
IN PCE 9 HAS THE THICKEST SMECTITE;
Comments : WHOLLY GRAY LIKE THE LOWER PART OF PCE 5;
Phenocrysts: PLAGIOCLASE ( TR-1%)
Size(mm): TO 2X6
IN PCE 7 AT 77CM: 2X6MM (V.F.GRAINED OVOID
INCLUSIONS-PROBABLY IN PHENO CENTER),X'=
1.561-1.575,AN73-90 (FAIRLY UNIFORMLY
UNIFORMLY DISTRIBUTED THROUGH THIS RANGE,
PART OF THE SCATTER MAY BE DUE TO IMPERFECT
CLEAVAGE), Z' = 1.571-1.578 (010), MAINLY
1.575, AN72-86+,MAINLY AN79;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 1320/1460 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 121.46
Core: 3 Top of Core Depth (m) : 117.00
Sect: 3 Top of Section Depth(m): 121.32
LITHOLOGY: DIABASE;
Piece No. : PCE 10 (132-146);
Structure : UNJOINTED, BOTTOM SURFACE IS A 20 DEGREE DIPPING
JOINT WITH LIGHT BLUE-GREEN SMECTITE COATING;
Comments : GRAY;
Phenocrysts: PLAGIOCLASE ( TR%)
Size(mm): TO 3X2
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 0/1500 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 123.00
Core: 3 Top of Core Depth (m) : 117.00
Sect: 4 Top of Section Depth(m): 121.50
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
Piece No. : PCE 1 (14-32), 2 (35-41), 3 (43-58), 4 (60-76),
5 (79-96), 6 (96-110), 7 (113-130), 8 (132-148);
Texture : MEDIUM-GRAINED WITH PERHAPS A SLIGHT GRAIN SIZE
DECREASE IN PCE 8 - THE MEDIUM-GRAINED DIABASE IS
OPHITIC WHEREAS THE SOMEWHAT FINER-GRAINED ROCK
TENDS MORE TOWARD INTERGRANULAR TEXTURE, OVOID
RADIAL SPHERULITES;
Structure : VEINS INCLUDE BLUE-GREEN & GREEN & BLACK SMECTITE
(ALSO SOME BROWN SMECTITE IN THE GENTLY DIPPING VEIN
AT 114-116CM) & ARAGONITE & POSSIBLY SOME MINOR
CALCITE;
Alteration : FRESH
THE ONLY SIGNIFICANT ALTERATION OCCURS IN THE
BOTTOM 3CM & IN A 1CM-THICK ZONE ON EITHER SIDE OF
THE VEIN AT 114-116CM - THE BROWN ALTERATION
PENETRATES ONLY ABOUT HALF THE CORE - OUTSIDE THE
ALTERED ZONE THE VEIN IS DARK GREEN SMECTITE &
INSIDE IT IS PRISMATIC ARAGONITE PLUS DARK GREEN
CARBONATE WITH MINOR BROWNISH ALTERATION & AT THE
EDGE OF THE ZONE IT IS DARK BROWN SMECTITE: THIS
LACK OF CORRESPONDENCE OF SMECTITE COLORS WITH
HOST ROCK STAINING SUGGESTS THAT STAINING ADVANCED
FASTER THAN OXIDATION OF SMECTITE - BOTH STAINING
& THE LOCALLY INTENSE BROWN COLOR OF THE VEIN AT
THE EDGE OF THE BROWN ALTERED ZONE MAY BE DUE TO
HIGH SULFIDE CONCENTRATION IN THE VEIN PRIOR TO
ALTERATION - THE RESTRICTION OF ARAGONITE TO THE
PART OF THE VEIN IN THE STAINED ZONE OF THE HOST
ROCK PROBABLY IS COINCIDENTAL;
Comments : GRAY EXCEPT WHERE ALTERED TO BROWN, APPARENTLY THE
PIECES OF THIS CORE ARE ESSENTIALLY CONTINUOUS BUT
FOR BREAKS WHERE FLAT TO GENTLY-DIPPING VEINS OR
FRACTURES OCCUR - IN RELATIVELY FRESH ROCK THE
REMNANTS OF THOSE VEINS & FRACTURES ARE BETTER
PRESERVED ON THE TOPS OF THE CORE PIECES - EVIDENTLY
THE LOOSE ROTATING OR JOSTLED UPPER PIECE IS MORE
ABRADED, STYROFOAM DIVIDERS EACH ABOUT 2CM WIDE
SEPARATE PIECES OF CORE THAT ARE NOT KNOWN TO BE
PART OF A CONTINUOUS CORE SEGMENT - AN UNKNOWN
AMOUNT OF BASALT IS MISSING FROM THE PLACES WHERE
THE STYROFOAM HAS BEEN ADDED;
Vesicles : Size(mm): Percent: TR
Location: PCE 2 Filling: SMEC, ARAGONIT
VUGS ARE LINED BY BLUE-GREEN BOTRYOIDAL SMECTITE,
HOLES IN PCE 4 LINED BY GREEN SMECTITE WITH THE
INNER SURFACES COATED BY LIGHT BLUE FILMS, SOME
HOLES ALSO CONTAIN ARAGONITE;
Phenocrysts: PLAGIOCLASE ( 0-2%)
Size(mm): TO 5.5X3
ABUNDANCE INCREASES FROM <0.5% IN PCES 1-3 TO 1%
IN PCES 4-6 TO 2% IN PCES 7&8, THE 2% REPRESENTS A
DEFINITE INCREASE ABOVE THE NORMAL RANGE OF
FLUCTUATION OF PLAG PHENOCRYST ABUNDANCE WHICH
RARELY EXCEEDS 1% - THIS PORTION APPEARS TO BE
PART OF A CUMULATE ZONE IN THE SENSE OF AN
INCREASED VOLUME PERCENTAGE OF PHENOCRYSTS BUT
WITHOUT DEVELOPMENT OF CUMULUS TEXTURES;
OLIVINE
IN HIGHER SECTIONS IN CORE 3 & IN THIS SECTION
(DOWN TO ABOUT 110CM) OLIVINE PHENOCRYSTS--WHERE
PRESENT--ARE PSEUDOMORPHED BY BLUE-GREEN SMECTITE,
FROM 110-148CM (PCES 7&8) THEY ARE FRESH TO
LARGELY FRESH & LIGHT BOTTLE GREEN IN COLOR EXCEPT
IN THE 3CM ALTERED BROWN ZONE AT THE BOTTOM;
Groundmass : COMBINATION
CONTAINS WELL-DEVELOPED "QUENCHED" GROUNDMASS WITH
ABUNDANT SKELETAL CRYSTALS OF PLAG & AMPHIBOLE(?)
& APATITE(?) & ZEOLITE(?) & CARBONATE & PIGEONITE
(?) & SUBCALCIC AUGITE IN AN EXTREMELY FINE-
GRAINED SMECTITE BASE THAT MAY HAVE BEEN
GLASS, CONTAINS BROWN OVOID SPHERULITES WITH
MICROCRYSTALLINE RADIAL STRUCTURES - THE
SPHERULITES ARE REMARKABLY LIKE THOSE PRODUCED BY
QUENCHING AT THE BASES OF THE GLASSY SELVAGES OF
SUBMARINE PILLOWS & MAY BE IDENTICAL TO THESE;
Replacement: CARBONATE
CALCITE
ARAGONITE
AUGITE
SMECTITE
Minerals Replaced: OLIVINE, GLASS
Leg : 34 Top/Bottom Interval(mm): 140/ 320 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 121.82
Core: 3 Top of Core Depth (m) : 117.00
Sect: 4 Top of Section Depth(m): 121.64
LITHOLOGY: DIABASE;
Piece No. : PCE 1 (14-32);
Texture : MEDIUM-GRAINED;
Structure : UNJOINTED BUT TOP SURFACE IS A 15 DEGREE DIPPING
JOINT WITH PARTIAL COAT OF BLUE-GREEN SMECTITE;
Alteration : FRESH;
Comments : GRAY COLOR;
Phenocrysts: PLAGIOCLASE ( 0.5%)
Size(mm): TO 4X2.5
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 350/ 410 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 121.91
Core: 3 Top of Core Depth (m) : 117.00
Sect: 4 Top of Section Depth(m): 121.85
LITHOLOGY: DIABASE;
Piece No. : PCE 2 (35-41);
Structure : UNJOINTED & UNVEINED BUT BOTTOM SURFACE IS PARTLY AN
IRREGULAR JOINT COATED BY INTERLAYERED DARK GREEN &
BLACK RESINOUS SMECTITE;
Alteration : FRESH;
Comments : GRAY COLOR;
Vesicles : BOTRYOIDAL VUG COATED BY A LIGHT BLUE-GREEN FILM;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 430/ 580 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 122.08
Core: 3 Top of Core Depth (m) : 117.00
Sect: 4 Top of Section Depth(m): 121.93
LITHOLOGY: DIABASE;
SIMILAR TO PCE 2;
Piece No. : PCE 3 (43-58);
Structure : UNJOINTED & UNVEINED EXCEPT FOR BLUE-GREEN FLAT-
LYING SMECTITE PATCH ON TOP SURFACE;
Phenocrysts: PLAGIOCLASE ( TR%)
Size(mm): TO 2X3
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 600/ 760 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 122.26
Core: 3 Top of Core Depth (m) : 117.00
Sect: 4 Top of Section Depth(m): 122.10
LITHOLOGY: DIABASE;
SIMILAR TO PCE 3;
Piece No. : PCE 4 (60-76);
Structure : NO JOINTS OR VEINS BUT TOP SURFACE IS PARTLY AN
IRREGULAR SMECTITE-COATED JOINT WITH HOLES LINED BY
BOTRYOIDAL DARK GREEN SMECTITE WHICH IS COATED BY
LIGHT BLUE-GREEN FILMS & SOME CONTAIN RADIAL SPLAY
OF COLORLESS ARAGONITE;
Alteration : RARE RUST SPOTS ON THE ROCK MAY BE OXIDIZED
PYRITE;
Phenocrysts: PLAGIOCLASE ( 1%)
Size(mm): TO 5X2
Replacement: SMECTITE
ARAGONITE
PYRITE
Leg : 34 Top/Bottom Interval(mm): 790/1100 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 122.60
Core: 3 Top of Core Depth (m) : 117.00
Sect: 4 Top of Section Depth(m): 122.29
LITHOLOGY: DIABASE;
Piece No. : PCE 5 (79-96), 6 (96-110);
Structure : A CARBONATE VEIN OCCURS ABOUT 1-3MM ABOVE THE BASE
OF THE ALTERED ZONE;
Alteration : FRESH
FRESH EXCEPT FOR A GENTLY DIPPING 1CM BROWN
ALTERED ZONE AT 93-95CM WHERE THE PIECES PARTED;
Comments : GRAY COLOR;
Phenocrysts: PLAGIOCLASE ( 1%)
Size(mm): TO 5.5X3
OLIVINE
GREEN, AT BOTTOM OF PCE 6;
Replacement: CARBONATE
SMECTITE
NO BLUE-GREEN PSEUDOMORPHS THOUGH THEY ARE PRESENT
IN PCES 4&5 AND THE UPPER PART OF PCE 6;
Leg : 34 Top/Bottom Interval(mm): 1130/1300 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 122.80
Core: 3 Top of Core Depth (m) : 117.00
Sect: 4 Top of Section Depth(m): 122.63
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
SIMILAR TO PCES 5&6;
Piece No. : PCE 7 (113-130);
Structure : CARBONATE & SMECTITE VEIN IN INTERVAL 114-116CM;
Alteration : 1CM-THICK BROWN ALTERED ZONE AT 114-116CM WITH AN
INTERMIXED CARBONATE & DARK BROWN & DARK GREEN
SMECTITE VEIN - THE ALTERATION DOES NOT PENETRATE
THE CORE BUT APPEARS AS BROWNISH DISCOLORATION
AROUND THE VEIN - APPARENTLY THE BROWN COLOR OF
THE SMECTITE IS NOT COEXTENSIVE WITH BROWN
DISCOLORATION OF HOST ROCK & MAY DEPEND ON THE
FORMER LOCAL PRESENCE OF ANOTHER MINERAL SUCH AS
PYRITE (NO PYRITE SEEN) - THE CARBONATE IS
COEXTENSIVE WITH THE BROWN DISCOLORATION OF THE
HOST ROCK - INFERRED HISTORY IS FORMATION OF CRACK
FOLLOWED BY INFLUX OF WATER & PRECIPITATION OF
SMECTITE & ARAGONITE FOLLOWED BY INFLUX OF OXYGEN
& CARBON DIOXIDE ALTERING SMECTITE & HOST ROCK
(THESE MAY ALL BE PHASES OF SAME GENERAL
DIAGENETIC ALTERATION PROCESS) - SKETCH OF CRACK
ON SHIPBOARD FORM;
Phenocrysts: PLAGIOCLASE ( 2%)
Size(mm): TO 5X3
COMMONLY HAVE INCLUSIONS IN CORE;
OLIVINE ( <0.5%)
FRESH, MORE ABUNDANT THAN IN PCE 6;
Replacement: SMECTITE
RARE SMECTITE SPOTS ARE SEEN BUT ARE NOT OBVIOUSLY
CONNECTED WITH OLIVINE;
ARAGONITE
Leg : 34 Top/Bottom Interval(mm): 1320/1480 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 122.98
Core: 3 Top of Core Depth (m) : 117.00
Sect: 4 Top of Section Depth(m): 122.82
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
SIMILAR TO PCE 7;
Piece No. : PCE 8 (132-148);
Texture : THIS & PCE 7 MAY REPRESENT A CUMULATE ZONE BUT NO
CUMULUS TEXTURE;
Structure : NO VEINS OR JOINTS, GREEN SMECTITE ALONG CRACKS;
Alteration : BOTTOM 3CM BROWN & ALTERED, IN THE ALTERED ZONE
THE OLIVINE IS OXIDIZED RED & PLUCKS FROM THE
SURFACE OF THE CORE LEAVING PITS;
Phenocrysts: PLAGIOCLASE ( 2%)
PLAG & OLIVINE PHENOCRYSTS ARE LOCALLY GLOMERATIC;
OLIVINE (0.5-1%)
OXIDIZED IN THE ALTERED ZONE;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 0/1030 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 124.03
Core: 3 Top of Core Depth (m) : 117.00
Sect: 5 Top of Section Depth(m): 123.00
LITHOLOGY: PLAG-OLIVINE SPARSELY PHYRIC DIABASE;
BASALT;
Piece No. : PCE 1 (8-24), 2 (26-42), 3 (42-49), 4 (49-64),
5 (66-84), 6 (86-88), 7 (90-93), 8 (93-96),
9 (98-103);
Texture : GRADES FROM MEDIUM-GRAINED DIABASE IN 8-25CM TO FINE
TO MEDIUM-GRAINED DIABASE IN 26-75CM, BELOW 75CM
THERE IS A RAPID & MEGASCOPICALLY VISIBLE DECREASE
TO FINE-GRAINED DIABASE & COARSE-GRAINED BASALT AT
84CM - COARSE-GRAINED BASALT CONTINUES WITH
PROGRESSIVE DECREASE OF GRAIN SIZE TO MEDIUM-GRAINED
BASALT IN 98-103CM, SUBOPHITIC TO INTERGRANULAR
TEXTURE AT TOP OF SEC 5 TO INTERGRANULAR THROUGH
MOST OF THE ROCK BELOW 40CM TO FINELY INTERGRANULAR
TO QUENCHED (WHEAT SHEAF & PLUMOSE TEXTURES) IN
98-103CM;
Structure : VEINS INCLUDE DARK GREEN & GRAY-GREEN & BROWN
SMECTITE WITH CALCITE & SULFIDE & (IN INTERVAL
98-103CM) POSSIBLY GOETHITE;
Alteration : FRESH
INTERVAL 8-25CM;
FRESH TO MOD
INTERVAL 26-75CM;
MOD
INTERVAL 75-103CM;
Comments : DARK GRAY & FRESH AT TOP - DARK GRAY & FRESH OR DARK
BROWNISH GRAY & ALTERED IN 26-75CM - DARK BROWNISH
GRAY & ALTERED BELOW 75CM, INTERVAL 98-103CM BASALT
IS THE LOWEST PIECE OF CORE RECOVERED IN THE COOLING
UNIT WHICH BEGAN IN SEC 2-1 & INCLUDES CORE 2 SECS
2&3 & CORE 3 SECS 1-4, STYROFOAM DIVIDERS EACH
ABOUT 2CM WIDE SEPARATE PIECES OF CORE THAT ARE NOT
KNOWN TO BE PART OF A CONTINUOUS CORE SEGMENT - AN
UNKNOWN AMOUNT OF BASALT IS MISSING FROM THE PLACES
WHERE THE STYROFOAM HAS BEEN ADDED;
Phenocrysts: PLAGIOCLASE ( 1-2%)
Size(mm): TO 2.5X2
TOTAL PHENOCRYST PERCENTAGES RANGE FROM 1-2% IN
8-24CM (LOWER PART OF CUMULATE ZONE) TO ABOUT 1%
FROM 25-103CM, AN 8X5MM PLAG (THE LARGEST SEEN)
OCCURS AT 39CM & AN 8X3MM PLAG IS IN INTERVAL
66-84CM BUT BELOW THAT THE LARGEST ONES ARE FROM
2X1 TO 2.5X2MM - THE LARGE GRAINS PROBABLY SANK
FROM ABOVE WHEREAS THE SMALLER ONES AT GREATER
DEPTH EITHER WERE PRESENT AT THE TIME OF ERUPTION
OR GREW ONLY SLIGHTLY THEREAFTER;
OLIVINE
FRESH AT TOP RAPIDLY GIVING WAY DOWNWARD TO
SMECTITE PSEUDOMORPHS;
Replacement: GOETHITE
CALCITE
Minerals Replaced: OLIVINE
NEAR LOWER CONTACT OF COOLING UNIT CALCITE IS A
MINOR BUT INCREASINGLY ABUNDANT COMPONENT OF THE
ALTERED OLIVINE (THIS APPEARS TO BE CHARACTERISTIC
OF ALTERED OLIVINE IN THIN COOLING UNITS & NEAR
THE CONTACTS OF THICKER UNITS);
SMECTITE
Minerals Replaced: OLIVINE
OLIVINE PHENOCRYSTS GIVE WAY DOWNWARD TO
PSEUDOMORPHS WHICH ARE BLUE-GREEN SMECTITE IN
25-92CM BELOW WHICH THEY BECOME BROWNISH GREEN &
FINALLY BROWN;
SULFIDE
Leg : 34 Top/Bottom Interval(mm): 1040/1140 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 124.14
Core: 3 Top of Core Depth (m) : 117.00
Sect: 5 Top of Section Depth(m): 124.04
LITHOLOGY: BASALT;
Piece No. : PCE 10 (104-107), 11 (109-114);
Texture : GRAIN SIZE DECREASES DOWNWARD FROM COARSE-GRAINED
INTERGRANULAR TO FINE-GRAINED VARIOLITIC;
Comments : A SECOND COOLING UNIT IS DEFINED FROM 104-114CM ON
THE BASIS OF GRAIN SIZE CHANGES - THE BOUNDARIES OF
THIS UNIT ARE UNCERTAIN - IT PROBABLY REPRESENTS A
PILLOW OR A THIN FLOW;
Phenocrysts: PLAGIOCLASE ( <0.5%)
MICROPHYRIC;
OLIVINE
OLIVINES ARE PSEUDOMORPHED BY SMECTITE;
Replacement: SMECTITE
Minerals Replaced: OLIVINE
Leg : 34 Top/Bottom Interval(mm): 1160/1500 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 124.50
Core: 3 Top of Core Depth (m) : 117.00
Sect: 5 Top of Section Depth(m): 124.16
LITHOLOGY: BASALT;
Piece No. : PCE 12 (116-120), 13 (122-124), 14 (126-131),
15 (133-142), 16 (143-147);
Texture : GRAIN SIZE VARIES FROM APHANITIC TO VERY FINE-
GRAINED, COMMONLY PILOTAXITIC IN A VARIOLITIC
GROUNDMASS;
Comments : UPPERMOST PART OF INTERVAL COULD BELONG TO THE
OVERLYING UNIT BUT IT IS HERE INTERPRETED AS THE TOP
OF A UNIT WHICH CONTINUES IN CORES 4&5;
Vesicles :
Location: Filling: SMECTITE, CARB
COMPLETELY FILLED VESICLES CONTAIN SMECTITE & SOME
CARBONATE (CALCITE OR MAGNESIUM CALCITE),
SMECTITES ARE YELLOW & BROWN & RED NEAR THE TOP &
GREEN DEEPER DOWN;
Phenocrysts: PLAGIOCLASE
Size(mm): TO 2X2
OLIVINE
Replacement: SMECTITE
Minerals Replaced: OLIVINE
YELLOW & RED-BROWN;
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 80/ 240 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 123.24
Core: 3 Top of Core Depth (m) : 117.00
Sect: 5 Top of Section Depth(m): 123.08
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
Piece No. : PCE 1 (8-24);
Texture : MEDIUM-GRAINED;
Structure : AT 13-14CM THERE IS A VERY GENTLY DIPPING (ALMOST
FLAT) IRREGULAR ANASTOMOSING VERY THIN (0.1MM) VEIN
OF DARK GREEN SMECTITE - EXCEPT ON ONE SURFACE OF
THE CORE THE VEIN IS UNALTERED;
Alteration : FRESH
MOD
UPPER 3CM, THIS BROWN ALTERED ZONE IS THE
COUNTERPART OF THAT AT THE BOTTOM OF 319A-3-4
(PCE 8);
Comments : GRAY, UPPER 3CM IS BROWN, THIS & PCE 8 FROM 319A-3-4
ARE VERY MUCH ALIKE EXCEPT PERHAPS FOR SLIGHTLY
FEWER PHENOCRYSTS IN PCE 1;
Phenocrysts: PLAGIOCLASE ( 1-2%)
OLIVINE ( 0.5%)
OLIVINE IS GREEN;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 260/ 420 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 123.42
Core: 3 Top of Core Depth (m) : 117.00
Sect: 5 Top of Section Depth(m): 123.26
LITHOLOGY: PLAG SPARSELY PHYRIC DIABASE;
Piece No. : PCE 2 (26-42);
Texture : FINE TO MEDIUM-GRAINED (PERHAPS SLIGHTLY FINER THAN
ABOVE);
Structure : A CALCITE VEIN REMNANT IS PRESENT ON THE BOTTOM
SURFACE & HAS ABOUT THE SAME 30 DEGREE DIP AS THE
ALTERED ZONE, GREEN SMECTITE CRACKS IN THE OLIVINE,
NO FRACTURES OR VEINS;
Alteration : FRESH
MOD
PARTIALLY ALTERED (BROWN) IN LOWER 3CM BELOW A
BOUNDARY DIPPING ABOUT 30 DEGREES;
Phenocrysts: PLAGIOCLASE
Size(mm): TO 8X5
SOMEWHAT LESS ABUNDANT THAN ABOVE, LARGEST PLAG
YET SEEN IS 8X5MM & DISTINCTLY OVOID IN SHAPE &
OCCURS AT 39CM;
OLIVINE
PSEUDOMORPHED BY BLUE-GREEN SMECTITE IN THE
ALTERED ZONE;
Replacement: SMECTITE
Minerals Replaced: OLIVINE
CALCITE
Leg : 34 Top/Bottom Interval(mm): 420/ 490 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 123.49
Core: 3 Top of Core Depth (m) : 117.00
Sect: 5 Top of Section Depth(m): 123.42
LITHOLOGY: DIABASE;
Piece No. : PCE 3 (42-49);
Structure : CARBONATE VEIN ROUGHLY ALONG CENTER OF ALTERED ZONE
& A MUCH THINNER SUBSIDIARY NON-PENETRATIVE
ANASTOMOSING VEIN OF IRREGULAR TREND LIES ABOUT
1-3CM BELOW MAIN CARBONATE VEIN, THE MAIN VEIN IS
INTERLAYERED WITH BROWN SMECTITE FILMS & ENCLOSES
THIN LENSES OF HOST ROCK - IT FORMED IN AN OPEN
TENSIONAL JOINT, BOTTOM OF PCE 3 CONTAINS REMNANTS
OF AN ALMOST FLAT CARBONATE VEIN;
Alteration : BROWN & ALTERED EXCEPT FOR A SMALL PART AT BOTTOM,
THIS & THE BOTTOM OF PCE 2 & TOP OF PCE 4 ARE AN
ALTERED ZONE ABOUT 9CM THICK DIPPING ABOUT 35
DEGREES, AS IS USUAL BROWN ALTERATION IN THIS FLOW
OR SILL CORRELATES WITH CARBONATE VEINS;
Replacement: CARBONATE
SMECTITE
Leg : 34 Top/Bottom Interval(mm): 490/ 640 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 123.64
Core: 3 Top of Core Depth (m) : 117.00
Sect: 5 Top of Section Depth(m): 123.49
LITHOLOGY: DIABASE;
Piece No. : PCE 4 (49-64);
Texture : FINE-GRAINED, DISTINCTLY FINER THAN ABOVE;
Alteration : FRESH
BELOW MINOR BROWN ALTERED ZONE AT TOP (SEE PCE 3
DESCRIPTION);
Comments : GRAY;
Phenocrysts: PLAGIOCLASE ( 1%)
LESS THAN IN PCE 1 OF THIS SECTION;
OLIVINE
A LITTLE OR NO FRESH OLIVINE EXCEPT PERHAPS AT THE
TOP - AT BOTTOM BLUE-GREEN PSEUDOMORPHS PROBABLY
REPRESENT ALTERED OLIVINE;
Leg : 34 Top/Bottom Interval(mm): 660/ 840 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 123.84
Core: 3 Top of Core Depth (m) : 117.00
Sect: 5 Top of Section Depth(m): 123.66
LITHOLOGY: DIABASE;
SIMILAR TO PCE 4;
Piece No. : PCE 5 (66-84);
Texture : NOTICABLY & PROGRESSIVELY FINER-GRAINED THAN PCE 4
FROM ABOUT 75CM DOWNWARD, AT BOTTOM IS A PORPHYRITIC
COARSE OR MEDIUM-GRAINED BASALT;
Comments : RELATIVELY CHILLED;
Phenocrysts: PLAGIOCLASE ( 0.5%)
Size(mm): TO 8X3
AT BOTTOM, GENERALLY MUCH LARGER THAN THE AVERAGE
ABOVE, APPARENTLY REPRESENTING SUNKEN LARGE
CRYSTALS, COMMONLY CONTAIN VISIBLE DARK INCLUSIONS
IN THEIR CORES;
Groundmass : OLIVINE
Replacement: SMECTITE
Size(mm): TO 3
Minerals Replaced: OLIVINE
MESH-TEXTURED BLUE-GREEN SMECTITE PSEUDOMORPHS
PROBABLY REPRESENT ALTERED "CUMULATE" OLIVINE
FROZEN INTO THIS RELATIVELY CHILLED ROCK;
Leg : 34 Top/Bottom Interval(mm): 860/ 880 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 123.88
Core: 3 Top of Core Depth (m) : 117.00
Sect: 5 Top of Section Depth(m): 123.86
LITHOLOGY: DIABASE;
Piece No. : PCE 6 (86-88);
Texture : FINE-GRAINED;
Comments : SMALL FRESH TO ALTERED FRAGMENTS OF FINE-GRAINED
DIABASE;
Leg : 34 Top/Bottom Interval(mm): 900/ 925 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 123.93
Core: 3 Top of Core Depth (m) : 117.00
Sect: 5 Top of Section Depth(m): 123.90
LITHOLOGY: BASALT;
Piece No. : PCE 7 (90-92.5);
Texture : COARSE-GRAINED, MESH-TEXTURED PSEUDOMORPHS;
Structure : SCATTERED FINELY DRUSY YELLOW SULFIDE PATCHES ON
UPPER SURFACE - APPARENTLY A FLAT-LYING VEIN;
Comments : GRAY ABOVE & BROWN BELOW, THE RELATIONS BETWEEN
PSEUDOMORPHS & PHENOCRYSTS SUGGEST THAT THE EMPTYING
MAGMA HAD MORE OLIVINE THAN PLAG CRYSTALS & THAT THE
LARGE CALCIC CRYSTALS IN THE OVERLYING DIABASE GREW
AFTER EMPLACEMENT & SETTLED DOWNWARD TO SOME EXTENT
(I.E. TIME-CUMULATE ZONE COMPOSED OF PHENOCRYSTS
XTLLIZED AFTER ERUPTION)-NOT CONFIRMED BY T.S.);
Phenocrysts: PLAGIOCLASE ( <0.5%)
Size(mm): TO 2X1
OLIVINE ( 1%)
BLUE-GREEN SMECTITE PSEUDOMORPHS AFTER OLIVINE;
Replacement: SMECTITE
Minerals Replaced: OLIVINE
SULFIDE
Leg : 34 Top/Bottom Interval(mm): 930/ 960 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 123.96
Core: 3 Top of Core Depth (m) : 117.00
Sect: 5 Top of Section Depth(m): 123.93
LITHOLOGY: BASALT;
Piece No. : PCE 8 (93-96);
Texture : COARSE-GRAINED;
Comments : BROWN & ALTERED;
Phenocrysts: PLAGIOCLASE ( 1%)
Size(mm): TO 2.5X2
"OLIVINE" & PLAG OFTEN GLOMERATIC;
OLIVINE ( 0.5%)
DARK BROWNISH GREEN PSEUDOMORPHS AFTER OLIVINE;
Replacement: SMECTITE
Minerals Replaced: OLIVINE
Leg : 34 Top/Bottom Interval(mm): 980/1030 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 124.03
Core: 3 Top of Core Depth (m) : 117.00
Sect: 5 Top of Section Depth(m): 123.98
LITHOLOGY: BASALT;
Piece No. : PCE 9 (98-103);
Texture : MEDIUM TO COARSE-GRAINED;
Structure : ONE IRREGULAR FRACTURE PARTLY COATED BY THIN EARTHY
FILM OF GRAY-GREEN SMECTITE(?);
Comments : ONE SURFACE IS WHOLLY COVERED BY DARK BROWN EARTHY
MATERIAL (OXIDIZED SMECTITE?) + MINOR INTERLAYERED
CALCITE - THIS IS A VEIN(?) ABOUT 0.5MM THICK - ITS
STREAK IS OCHRA (YELLOW-BROWN) - GOETHITE?,
SUBSPHERICAL, ORIENTATION UNCERTAIN, GREENISH GRAY
COLOR;
Phenocrysts: PLAGIOCLASE ( 1%)
Size(mm): 1X2
1% TOTAL PERCENTAGE OF FRESH PLAG + OLIVINE;
OLIVINE
PSEUDOMORPHS AFTER OLIVINE;
Replacement: SMECTITE
Minerals Replaced: OLIVINE
CALCITE
Leg : 34 Top/Bottom Interval(mm): 1040/1070 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 124.07
Core: 3 Top of Core Depth (m) : 117.00
Sect: 5 Top of Section Depth(m): 124.04
LITHOLOGY: BASALT;
Piece No. : PCE 10 (104-107);
Texture : MEDIUM TO COARSE-GRAINED, TEXTURE APPEARS TO BE
VARIOLITIC ON ABRADED CORE SURFACE - THIS IS NOT
SEEN IN PCE 9 WHICH IS EVEN FINER GRAINED THAN PCE
10;
Comments : PARTLY BROWNISH, BASE OF SILL OR FLOW BETWEEN
PCES 9&10;
Phenocrysts: PLAGIOCLASE ( <0.5%)
GLOMEROCRYSTS OF PLAG + OLIVINE(?);
OLIVINE
PSEUDOMORPHS;
Leg : 34 Top/Bottom Interval(mm): 1090/1140 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 124.14
Core: 3 Top of Core Depth (m) : 117.00
Sect: 5 Top of Section Depth(m): 124.09
LITHOLOGY: BASALT;
Piece No. : PCE 11 (109-114);
Texture : VARIOLITIC, SOMEWHAT FINER-GRAINED THAN PCE 10;
Comments : GRAY WITH GREENISH TINGE;
Leg : 34 Top/Bottom Interval(mm): 1160/1200 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 124.20
Core: 3 Top of Core Depth (m) : 117.00
Sect: 5 Top of Section Depth(m): 124.16
LITHOLOGY: PLAG-OLIVINE MODERATELY MICROPHYRIC BASALT;
Piece No. : PCE 12 (116-120);
Texture : APHANITIC TO VERY FINE-GRAINED, MICROPHYRIC, FINER
THAN PCE 11, VERY FINELY VARIOLITIC;
Comments : DARK BROWNISH GRAY, COOLING UNIT BOUNDARY BETWEEN
PCES 12&13 OR PCES 11&12;
Vesicles :
Location: Filling: SMECTITE
Shape : ROUND
TINY AMYUGDULES ARE JUST LIKE OLIVINE EXCEPT FOR
SHAPE, RARE VESICLES HAVE ONLY A DARK GREEN
SMECTITE LINING;
Phenocrysts: PLAGIOCLASE ( 2-3%)
MICROPHENOCRYSTS MAINLY PLAG;
OLIVINE
MINOR PSEUDOMORPHS AFTER OLIVINE ARE YELLOW - OR
RED-BROWN WHERE OXIDIZED;
Replacement: SMECTITE
Minerals Replaced: OLIVINE
Leg : 34 Top/Bottom Interval(mm): 1220/1240 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 124.24
Core: 3 Top of Core Depth (m) : 117.00
Sect: 5 Top of Section Depth(m): 124.22
LITHOLOGY: PLAG-OL SPARSELY PHYRIC BASALT;
SIMILAR TO PCE 12;
Piece No. : PCE 13 (122-124);
Texture : SPARSELY PHYRIC, PILOTAXITIC;
Structure : ONE VERTICAL JOINT WITH DARK BROWN SURFACE COAT;
Alteration : FRESHER THAN PCE 12;
Vesicles : Size(mm): <1 Percent:
Location: Filling: HOLLOW
LINED WITH SMECTITE;
Phenocrysts: PLAGIOCLASE ( 1-2%)
PHENOCRYSTS SLIGHTLY LARGER THAN PCE 12;
OLIVINE
Groundmass : PLAGIOCLASE
LATHS VISIBLE ON ABRADED CORE SURFACE ARE NOT
RANDOM BUT SUBPARALLEL--PILOTAXITIC WITH GENTLY
DIPPING OR FLAT FLOW LINES;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 1260/1310 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 124.31
Core: 3 Top of Core Depth (m) : 117.00
Sect: 5 Top of Section Depth(m): 124.26
LITHOLOGY: BASALT;
SAME AS PCE 13;
Piece No. : PCE 14 (126-131);
Texture : LOCALLY PILOTAXITIC;
Structure : TWO VERTICAL JOINTS AT RIGHT ANGLES BOTH COATED BY
YELLOW-GREEN SMECTITE & THIN REMNANTS OF CARBONATE
VEINS (VERY FINE-GRAINED MAGNESIAN(?) CALCITE &
POSSIBLY SOME ARAGONITE - BREAKS TO NEEDLES WITH
PARALLEL EXTINCTION);
Vesicles : Size(mm): <1 Percent:
Location: Filling: SMECTITE, HOLLOW
MAY BE FILLED WITH YELLOW SMECTITE OR HOLLOW
EXCEPT FOR A THIN LINING;
Replacement: SMECTITE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 1330/1420 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 124.42
Core: 3 Top of Core Depth (m) : 117.00
Sect: 5 Top of Section Depth(m): 124.33
LITHOLOGY: PLAG-OL PHYRIC BASALT;
Piece No. : PCE 15 (133-142);
Texture : PORPHYRITIC, VARIOLITIC;
Structure : TWO VERY STEEP JOINTS - ONE STAINED DARK BROWN & THE
OTHER COATED BY LIGHT TAN WAXY SMECTITE;
Comments : DARK BROWN-GRAY;
Vesicles : Size(mm): <1 Percent:
Location: Filling: SMECTITE, CARB
AMYGDULES HAVE SMECTITE LINING & FILLING OF EITHER
DARK GREEN SMECTITE OR COLORLESS CARBONATE;
Phenocrysts: PLAGIOCLASE ( 2-3%)
Size(mm): TO 2X
Replacement: CARBONATE
SMECTITE
Leg : 34 Top/Bottom Interval(mm): 1430/1470 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 124.47
Core: 3 Top of Core Depth (m) : 117.00
Sect: 5 Top of Section Depth(m): 124.43
LITHOLOGY: PLAG SPARSELY MICROPHYRIC BASALT;
Piece No. : PCE 16 (143-147);
Texture : APHANITIC, MICROPHYRIC, PILOTAXITIC;
Structure : VERY THIN STEEP TO VERTICAL VEINS ARE EITHER
CARBONATE OR LIGHT BROWN SMECTITE, A MODERATELY
DIPPING DISCONTINUOUS VEIN IS DARK GREEN SMECTITE &
A SIMILAR GENTLY DIPPING HAIRLINE VEIN IS CARBONATE,
THERE IS A SUGGESTION OF MANY INCIPIENT CRACKS;
Comments : DARK BROWNISH GRAY;
Vesicles : Size(mm): <1 Percent:
Location: Filling: SMEC, CARB, EMPTY
VESICLES MAY BE HOLLOW WITH A DARK GREEN SMECTITE
LINING ONLY OR FILLED OR PARTLY FILLED BY
CARBONATE - THE HOLLOW ONES MAY HAVE BOTRYOIDAL
SURFACE WITH LIGHT GRAY-GREEN COAT OR (WHERE
CARBONATE IS PRESENT) A VUGGY INTERIOR WHERE THE
FILLING IS NOT COMPLETE;
Phenocrysts: PLAGIOCLASE ( 1%)
Size(mm): TO 2X1
OFTEN GLOMERATIC;
Groundmass : PLAGIOCLASE
LATHS IN GROUNDMASS MAY BE RANDOM OR SUBPARALLEL
(PILOTAXITIC);
Replacement: CARBONATE
SMECTITE
Leg : 34 Top/Bottom Interval(mm): 0/1500 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 126.00
Core: 3 Top of Core Depth (m) : 117.00
Sect: 6 Top of Section Depth(m): 124.50
LITHOLOGY: PLAG-OL SPARSELY TO MODERATELY PHYRIC BASALT;
Piece No. : PCE 1 (10-27), 2 (28-49), 3 (51-63), 4 (63-65),
5 (67-71), 6 (73-77), 7 (79-84), 8 (86-93),
9 (95-99), 10 (101-109), 11 (111-116), 12 (119-130),
13 (129-143), 14 (143-149);
Texture : COARSENS SLOWLY BUT PROGRESSIVELY DOWNWARD FROM
MEDIUM-GRAINED BASALT TO COARSE & VERY COARSE-
GRAINED VARIOLITIC TO SUBOPHITIC BASALT & VERGES ON
FINE-GRAINED SUBOPHITIC DIABASE IN THE LOWEST PARTS
OF THE SECTION, SPARSELY TO MODERATELY PHYRIC;
Structure : VEINS INCLUDE BLEND OF BROWN & YELLOW & GREEN & RED
& BLUE SMECTITE & CARBONATE - THE VARIOUS SMECTITE
COLORS OCCUR ERRATICALLY WITH DEPTH--VARYING WITH
THE LOCAL FRESHNESS OF THE HOST ROCK - WHERE VEIN
CARBONATE WAS IDENTIFIED IN OILS IT WAS ALWAYS
CALCITE;
Comments : SECTION BELONGS ENTIRELY TO THE COOLING UNIT--THE
TOP OF WHICH WAS PENETRATED IN THE LOWER PART OF
SEC 3-5, FROM 10-65CM & 117-149CM THE ROCKS ARE
MIXTURES OF FRESH DARK GRAY & ALTERED DARK BROWNISH
GRAY ROCKS DISTRIBUTED IN A MANNER WHICH INDICATED
THAT THEY ARE PIECES OF BLOCKS BOUNDED BY WIDELY
SPACED JOINTS - CORE RECOVERY IN THESE INTERVALS WAS
GOOD & IN LARGE INTACT PIECES, IN THE INTERVAL
65-117CM THE UNIFORMLY BROWN & ALTERED PIECES ARE
SMALL & RECOVERY PROBABLY POOR, STYROFOAM SPACERS
EACH ABOUT 2CM WIDE SEPARATE PIECES OF CORE THAT ARE
NOT KNOWN TO BE PART OF A CONTINUOUS CORE SEGMENT:
AN UNKNOWN AMOUNT OF BASALT IS MISSING FROM THE
PLACES WHERE THE STYROFOAM HAS BEEN ADDED;
Vesicles :
Location: Filling: SMECTITE
Shape : ROUND
VESICLES SOMETIMES FILLED WITH GREEN SMECTITE -
PARTICULARLY IN PCES 1&2&11;
Size(mm): TO 8 Percent:
Location: PCES 7&8 Filling: FE.OX, SMEC, CALC
IRREGULAR HOLES LINED BY FE.OXIDE & TAN TO BROWN
SMECTITE & CALCITE;
Phenocrysts: PLAGIOCLASE (0.5-4%)
Size(mm): TO 6X5
PLAG & OLIVINE PHENOCRYSTS FORM UNIFORMLY ABOUT 1%
AT 10-130CM EXCEPT IN INTERVAL 95-99CM WITH ABOUT
2% & 101-116CM WITH 0.5% OR FEWER, INTERVAL
130-149CM CONTAINS ABOUT 3-4% PHENOS & APPEARS TO
BE A CUMULATE ZONE & MAY BE COMPLEMENTARY TO THE
DEPLETED INTERVAL FROM 101-116CM, THE MAXIMUM SIZE
RANGES FROM 2X1.5 TO 5X3MM IN INTERVAL 10-130CM &
UP TO 6X5MM IN THE CUMULATE ZONE;
OLIVINE
OLIVINE COMMONLY REPLACED BY BLUE-GREEN OR DARK
GREEN SMECTITE WITH CARBONATE IN SOME CASES;
Replacement: SMECTITE
Minerals Replaced: OLIVINE
CARBONATE
Minerals Replaced: OLIVINE
FERROUS OXIDE
CALCITE
Leg : 34 Top/Bottom Interval(mm): 100/ 270 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 124.77
Core: 3 Top of Core Depth (m) : 117.00
Sect: 6 Top of Section Depth(m): 124.60
LITHOLOGY: PLAG SPARSELY PHYRIC BASALT;
Piece No. : PCE 1 (10-27);
Texture : MEDIUM-GRAINED, PORPHYRITIC, DISTINCTLY COARSER THAN
LOWER PART OF SEC 5 - PROBABLY THE INTERIOR OF A
THIN FLOW OR PILLOW;
Structure : GENTLE TO VERTICAL NON-PENETRATIVE CRACKS, ONE 65
DEGREE DIPPING JOINT IN LOWER PART FILLED WITH DARK
RED-BROWN SMECTITE & A THIN CARBONATE VEIN;
Comments : GRAY-BROWNISH GRAY (FRESH-ALTERED) BOUNDARY IS STEEP
(ALMOST VERTICAL), COLOR IS DARK GRAY TO DARK
BROWNISH GRAY, PROBABLY THE INTERIOR OF A THIN FLOW
OR PILLOW;
Vesicles : Size(mm): <1 Percent:
Location: Filling: SMECTITE
AMYGDULES OF DARK GREEN SMECTITE;
Phenocrysts: PLAGIOCLASE ( 1%)
Size(mm): TO 5X3
Groundmass : LATHS IN GROUNDMASS ARE RANDOM & PROBABLY
VARIOLITIC;
Replacement: SMECTITE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 280/ 490 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 124.99
Core: 3 Top of Core Depth (m) : 117.00
Sect: 6 Top of Section Depth(m): 124.78
LITHOLOGY: PLAG SPARSELY PHYRIC BASALT;
Piece No. : PCE 2 (28-49);
Texture : COARSE-GRAINED, PORPHYRITIC, VARIOLITIC, SLIGHTLY
COARSER THAN PCE 1;
Structure : NON-PENETRATIVE FLAT CRACK WITH VERY THIN CARBONATE
VEIN (0.1MM THICK) ABOUT 5CM BELOW TOP, ONE STEEPLY
DIPPING NON-PENETRATIVE CRACK;
Comments : GRAY-BROWNISH GRAY BOUNDARY IS ALMOST FLAT IN UPPER
PART TO VERTICAL IN LOWER THREE-FOURTHS OF PCE 2;
Vesicles : Size(mm): <0.5 Percent: TR
Location: Filling:
Shape : ROUND
VESICLES & DARK GREEN AMYGDULES;
Phenocrysts: PLAGIOCLASE ( 1%)
Size(mm): TO 3X3
Replacement: SMECTITE
Minerals Replaced: OLIVINE
BLUE-GREEN PATCHES OF SMECTITE MAY BE CAVITY
FILLINGS OR POSSIBLY PSEUDOMORPHS AFTER OLIVINE;
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 510/ 650 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 125.15
Core: 3 Top of Core Depth (m) : 117.00
Sect: 6 Top of Section Depth(m): 125.01
LITHOLOGY: BASALT;
SIMILAR TO PCE 2;
Piece No. : PCE 3 (51-63), 4 (63-65);
Texture : SLIGHTLY FEWER PHENOCRYSTS THAN PCE 2;
Structure : STEEP TO MODERATELY DIPPING VEINS OF CARBONATE OR
BROWN SMECTITE OR BOTH INTERLAYERED - VARIES ALONG
LENGTH OF SAME VEIN;
Replacement: CARBONATE
SMECTITE
Leg : 34 Top/Bottom Interval(mm): 670/ 710 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 125.21
Core: 3 Top of Core Depth (m) : 117.00
Sect: 6 Top of Section Depth(m): 125.17
LITHOLOGY: BASALT;
Piece No. : PCE 5 (67-71);
Texture : SAME OR VERY SLIGHTLY COARSER THAN ABOVE,
VARIOLITIC, FEWER & SMALLER PHENOCRYSTS THAN ABOVE;
Structure : NON-PENETRATIVE FLAT CRACKS NEAR OR INTERSECTING
UPPER & LOWER SURFACES;
Alteration : ENTIRE PIECE IS BROWNISH WITH ALTERATION;
Comments : COLOR IS DARK GRAY;
Phenocrysts: PLAGIOCLASE
Size(mm): TO 2X2
Leg : 34 Top/Bottom Interval(mm): 730/ 770 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 125.27
Core: 3 Top of Core Depth (m) : 117.00
Sect: 6 Top of Section Depth(m): 125.23
LITHOLOGY: BASALT;
Piece No. : PCE 6 (73-77);
Texture : COARSE-GRAINED, VARIOLITIC;
Structure : STEEP IRREGULAR NON-PENETRATIVE CRACKS LINED BY
CALCITE & SMECTITE;
Alteration : ENTIRE SPECIMEN IS BROWNISH & ALTERED;
Comments : DARK BROWNISH GRAY;
Phenocrysts: PLAGIOCLASE ( TR%)
Size(mm): TO 4X2
Replacement: SMECTITE
CALCITE
Leg : 34 Top/Bottom Interval(mm): 790/ 840 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 125.34
Core: 3 Top of Core Depth (m) : 117.00
Sect: 6 Top of Section Depth(m): 125.29
LITHOLOGY: PLAG SPARSELY PHYRIC BASALT;
Piece No. : PCE 7 (79-84);
Texture : VARIOLITIC, PORPHYRITIC, LIKE PCE 6 OR SLIGHTLY
COARSER;
Structure : TOP SURFACE IS A CREAM OR TAN VEIN DIPPING 20
DEGREES (VERY FINE-GRAINED MICROCRYSTALLINE CALCITE
OR MAGNESIAN CALCITE);
Comments : DARK BROWN-GRAY, IRREGULAR HOLES UP TO 8MM IN
MAXIMUM DIMENSION - NOT CLEAR IF THEY ARE
DIKTYTAXITIC OR ALTERATION EFFECTS - SOME STAINED
RED OR LINED WITH LIGHT TAN SMECTITE BUT MOST
COMMONLY THEY ARE COATED BY DRUSY EQUANT CARBONATE
(COLORLESS OR LIGHT GRAY OR FE-STAINED) - THEY ARE
COARSE CALCITE;
Phenocrysts: PLAGIOCLASE ( 1%)
Replacement: SMECTITE
CALCITE
Leg : 34 Top/Bottom Interval(mm): 860/ 930 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 125.43
Core: 3 Top of Core Depth (m) : 117.00
Sect: 6 Top of Section Depth(m): 125.36
LITHOLOGY: BASALT;
SIMILAR TO PCE 7;
Piece No. : PCE 8 (86-93);
Comments : IRREGULAR HOLES FILLED WITH FINELY DRUSY ALMOST
BOTRYOIDAL CALCITE OR LIGHT BROWN SMECTITE OR DRUSY
CALCITE, ONE MASS OF DEEP RED SMECTITE & ANOTHER OF
DARK GREEN SMECTITE OXIDIZED PERIPHERALLY TO A BROWN
COLOR - THEIR ORIGIN UNCLEAR--THE DARK GREEN MAY BE
PART OF A VEIN;
Replacement: CALCITE
SMECTITE
Leg : 34 Top/Bottom Interval(mm): 950/ 990 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 125.49
Core: 3 Top of Core Depth (m) : 117.00
Sect: 6 Top of Section Depth(m): 125.45
LITHOLOGY: PLAG SPARSELY PHYRIC BASALT;
Piece No. : PCE 9 (95-99);
Texture : COARSE-GRAINED, VARIOLITIC;
Structure : ONE 45-DEGREE JOINT WITH DARK YELLOWISH GREEN
SMECTITE "STAIN";
Comments : DARK BROWNISH GRAY;
Phenocrysts: PLAGIOCLASE ( 2%)
Size(mm): TO 2X1.5
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 1010/1090 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 125.59
Core: 3 Top of Core Depth (m) : 117.00
Sect: 6 Top of Section Depth(m): 125.51
LITHOLOGY: BASALT;
SIMILAR TO PCE 9;
Piece No. : PCE 10 (101-109);
Texture : FEWER PHENOCRYSTS THAN PCE 9;
Structure : 45-DEGREE JOINT COATED WITH GREENISH YELLOW & RED-
BROWN SMECTITE PLUS A CARBONATE VEIN;
Alteration : ALTERED BROWN ASPECT OVERALL;
Comments : CONTAINS HOLES OR PLUCKED CRYSTALS;
Phenocrysts: PLAGIOCLASE ( <0.5%)
Size(mm): TO 5X2
Replacement: SMECTITE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 1110/1160 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 125.66
Core: 3 Top of Core Depth (m) : 117.00
Sect: 6 Top of Section Depth(m): 125.61
LITHOLOGY: BASALT;
Piece No. : PCE 11 (111-116);
Texture : SLIGHTLY COARSER-GRAINED THAN ABOVE, STILL
APPARENTLY VARIOLITIC;
Structure : MODERATELY DIPPING CARBONATE VEIN ON UPPER SURFACE,
ALMOST VERTICAL CARBONATE VEIN ON SIDE OF LOWER PART
--THE BROWN ALTERED PARTS OF THIS PIECE SEEM TO BE
RELATED TO THAT VEIN;
Alteration : BOTTOM IS VERY FRESH;
Comments : THE FRESHNESS & COLORS ARE LIKE THOSE OF THE THICK
UNIT HIGHER IN THIS CORE, GRAY WITH ALTERED BROWN
ASPECT;
Phenocrysts: PLAGIOCLASE ( 0.5%)
Size(mm): TO 3X2
Groundmass : OLIVINE
BOTTOM CONTAINS SMECTITE PSEUDOMORPHS AFTER
OLIVINE OR GROUNDMASS - HIGHER IN SECTION 6 & THE
LOWER PART OF SECTION 5 THESE APPEARED AS DEEP
RED-BROWN PSEUDOMORPHS DUE TO ALTERATION;
Replacement: SMECTITE
Minerals Replaced: OLIVINE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 1190/1300 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 125.80
Core: 3 Top of Core Depth (m) : 117.00
Sect: 6 Top of Section Depth(m): 125.69
LITHOLOGY: APHYRIC TO PLAG SPARSELY PHYRIC BASALT;
Piece No. : PCE 12 (119-130);
Structure : IN LOWER PART IS A 60 DEGREE DIPPING VEIN OF
CARBONATE IN A JOINT LINED WITH A FILM OF GREENISH
BROWN SMECTITE;
Comments : GRAY TO BROWN-ALTERED ASPECT;
Vesicles : Size(mm): TO 1.5 Percent:
Location: Filling: SMEC, CALC, OL
ABUNDANT HOLES IN LOWER PART ARE NOT CLEARLY
VESICLES OR VUGS, SOME HOLES PARTLY FILLED WITH
SMECTITE WHICH MAY HAVE WASHED OUT OF THEM, HOLES
RARELY HAVE TRANSPARENT VITREOUS CRYSTALS BUT NOT
TERMINATED, ONE HOLE YIELDS OLIVINE PLUS CALCITE--
EVIDENTLY THE OLIVINE IS PARTLY REPLACED BY
SMECTITE (& PERHAPS CALCITE) ALONG CRACKS & WASHED
OUT DURING DRILLING - OLIVINE ALSO ALTERED TO
SMECTITE (DARK GREEN TO BLUE-GREEN) ALONG CRACKS &
TENDING TO WASH OUT, APPARENTLY THE RELATIVELY
ABUNDANT "HOLES" & PLAG IN LOWER PART OF THIS
PIECE ARE A CUMULATE HORIZON;
Phenocrysts: PLAGIOCLASE ( 1%)
MORE ABUNDANT IN LOWER PART, IN 120-124CM THE ROCK
IS ALMOST APHYRIC;
Groundmass : OLIVINE
NY OF OL ABOUT 1.679 OR LESS (FO86-87) -
2V=90 DEGREES (FO85);
Replacement: SMECTITE
Minerals Replaced: OLIVINE
CALCITE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 1290/1430 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 125.93
Core: 3 Top of Core Depth (m) : 117.00
Sect: 6 Top of Section Depth(m): 125.79
LITHOLOGY: PLAG-OL MODERATELY PHYRIC BASALT;
SIMILAR TO LOWER PART OF PCE 12;
Piece No. : PCE 13 (129-143);
Structure : CONTAINS CONTINUATION OF 60 DEGREE DIPPING VEIN IN
PCE 12 FROM WHICH ANOTHER VEIN BRANCHES(?) IN UPPER
PART OF PCE 13--CAUSING THE BREAKUP OF PCE 12 FROM
PCE 13 & THE BREAKUP OF THE TOP OF PCE 13, BOTTOM
SURFACE IS A GENTLY DIPPING (5 DEGREES) JOINT COATED
WITH MEDIUM BLUE-GREEN SMECTITE & DARK YELLOWISH
BROWN SMECTITE & CALCITE;
Comments : THE BLUE-GREEN SMECTITE ON THE JOINT & REPLACING
OLIVINE PHENOCRYSTS SUGGESTS THAT THIS PART OF THE
FLOW UNIT WAS FAIRLY IMPERMEABLE &--THOUGH ALTERED--
IS NOT HIGHLY OXIDIZED LIKE THOSE PARTS WITH
ABUNDANT OPEN CRACKS & CALCITE VEINS - IN THIS
REGARD THE PRESENT UNIT IS BEGINNING TO RESEMBLE THE
RELATIVELY FRESH MASSIVE PARTS OF THE THICK UNIT
HIGHER IN CORE 3;
Phenocrysts: PLAGIOCLASE ( 3%)
Size(mm): TO 6X5
PHENOCRYST PERCENTAGE INCLUDES PLAG & OLIVINE;
OLIVINE
EXTENSIVELY ALTERED, TENDS TO PLUCK & LEAVE HOLES;
Replacement: SMECTITE
Minerals Replaced: OLIVINE
CALCITE
Leg : 34 Top/Bottom Interval(mm): 1430/1490 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 125.99
Core: 3 Top of Core Depth (m) : 117.00
Sect: 6 Top of Section Depth(m): 125.93
LITHOLOGY: PLAG-OL MODERATELY PHYRIC BASALT;
SIMILAR TO PCE 13;
Piece No. : PCE 14 (143-149);
Texture : COARSE-GRAINED;
Structure : TOP SURFACE CONTAINS SAME VEIN AS BOTTOM SURFACE OF
PCE 13, VERY THIN CALCITE + DARK GREEN SMECTITE VEIN
WITH BROWN DISCOLORATION FOR 0.5CM ON EITHER SIDE,
IRREGULAR DARK GREEN SMECTITE VEIN WITH NO BROWN
DISCOLORATION EXCEPT FAINTLY IN PLACES NEAR THE
CALCITE + SMECTITE VEIN ABOVE;
Comments : VERY LITTLE BROWN DISCOLORAION ON TOP SURFACE;
Phenocrysts: PLAGIOCLASE ( 3-4%)
OLIVINE
Replacement: SMECTITE
CALCITE
THE CARBONATE IS LOCALLY FINELY DRUSY WHERE
EXPOSED;
Leg : 34 Top/Bottom Interval(mm): 0/1500 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 128.00
Core: 4 Top of Core Depth (m) : 126.50
Sect: 1 Top of Section Depth(m): 126.50
LITHOLOGY: PLAG-OL MODERATELY PHYRIC DIABASE;
Piece No. : PCE 1 (93-95), 2 (94-100), 3 (100-108), 4 (109-111),
5 (111-119), 6 (111-119), 7 (119-129), 8 (130-148);
Texture : FINE-GRAINED;
Structure : VEINS ARE COMPOSED OF GREEN & BROWN SMECTITE & FE.
OXIDE & CARBONATE, IN INTERVAL 111-120CM A VEIN OF
SMECTITE DIPS ABOUT 70 DEGREES & IS BROWN & OXIDIZED
IN ITS LOWER PART & GREEN ABOVE, A FLAT-LYING
SMECTITE VEIN WHICH INTERSECTS THE STEEP ONE NEAR
THE FAIRLY SHARP GREEN-BROWN CONTACT (BUT ON THE
GREEN SIDE OF THE CONTACT) IS UNOXIDIZED & THE HOST
DIABASE ADJACENT TO THE OXIDIZED PARTS OF THE STEEP
VEIN SHOWS NO BROWN FE. STAINING;
Alteration : FRESH
MOD
EVIDENTLY THE STEEP VEIN WAS A CHANNEL OF
RELATIVELY HIGH PERMEABILITY FOR OXIDIZING
SOLUTIONS - THE SHARP OXIDATION FRONT SUGGESTS
THAT THE OXYGEN ENTERED BY DIFFUSION RATHER THAN
BULK FLOW;
Comments : COLOR IS GRAY, RECOVERED FAIRLY WELL INTACT BUT
SUBSEQUENTLY PARTED INTO SEVERAL ADDITIONAL PIECES
ON VEINS & JOINTS - RECOVERY APPEARS TO HAVE BEEN
GOOD IN THE SECTION REPRESENTED, STYROFOAM SPACERS
EACH ABOUT 2CM WIDE SEPARATE PIECES OF CORE THAT ARE
NOT KNOWN TO BE PART OF A CONTINUOUS CORE SEGMENT -
AN UNKNOWN AMOUNT OF BASALT IS MISSING FROM THE
PLACES WHERE THE STYROFOAM HAS BEEN ADDED, SECTION
IS ESSENTIALLY IDENTICAL WITH THE CUMULATE ZONE AT
THE BASE OF 319A-3-6, ONE VEIN OF GREEN SMECTITE
PASSES NEXT TO OR THROUGH A FRESH OLIVINE PHENOCRYST
WHICH IS ALTERED NO MORE THAN OTHERS MORE DISTANT
FROM VEINS - EVIDENTLY THE ALTERATION OF OLIVINE TO
GREEN SMECTITE WAS A DIFFUSION-CONTROLLED PROCESS
THAT OCCURRED IN CLOSE PROXIMITY TO DEPOSITION OF
SIMILAR SMECTITE IN THE DOUBTLESSLY MORE PERMEABLE
JOINTS WITHOUT BEING NOTABLY INFLUENCED - SINCE THE
FLUIDS INVOLVED WERE IN EQUILIBRIUM WITH SIMILAR OR
IDENTICAL GREEN SMECTITE IN BOTH THE OLIVINE & THE
JOINT THEY WERE CHEMICALLY SIMILAR OR IDENTICAL - IT
THUS APPEARS THAT THE OPENING OF THE JOINT BEFORE OR
(MORE LIKELY) CONCURRENTLY WITH VEIN DEPOSITION DID
NOT MECHANICALLY INFLUENCE THE CRACKS & CHANNELS IN
THE OLIVINE GRAIN--NOR DID THE SMECTITE SWELL OR
SHRINK DURING ITS FORMATION - AS A RESULT THE RATE
OF FLOW OR DIFFUSION OF REACTANTS TOWARD FRESH
OLIVINE SURFACES WAS NOT INCREASED BY FORMATION OF
THE VEIN - THE GREEN SMECTITE-FORMING ENVIRONMENT
WAS ONE IN WHICH EITHER (1) THERE WAS VOLUME-FOR-
VOLUME REPLACEMENT OR (2) DEPOSITION PROCEEDED
CONCURRENTLY WITH THE VOLUME INCREASE REPRESENTED BY
THE JOINT - THE SHARP WALLED VEINS & LACK OF
ALTERATION OF PLAGIOCLASE & PYROXENE IN THE HOST
ROCK SUPPORT ALTERNATIVE (2) - FROM THE COLLECTIVE
FACTS ONE CAN INFER THAT OPEN VOIDS DID NOT EXIST AT
THAT STAGE--IN CONTRAST TO THE SITUATION DURING
LATER OXIDATIVE ALTERATION--THE RESULTS OF WHICH ARE
SEEN IN OTHER SPECIMENS FROM HOLE 319A DURING WHICH
OPEN CHANNELS EXISTED AS EVIDENCED BY CALCITE VEINS
THAT LOCALLY ENCLOSE SPALLS OF HOST ROCK & DRUSY
CAVITIES;
Phenocrysts: PLAGIOCLASE ( 4-5%)
Size(mm): TO 11X9
THE LARGEST PLAG IS REPLETE WITH INCLUSIONS
THROUGH ALL BUT A THIN RIM & OCCURS AT 147CM -
OTHERWISE THE LARGEST ONE IS 7X3.5MM, MANY OF THE
SMALLER PLAGIOCLASES ALSO HAVE INCLUSIONS IN THEIR
CORES & THEY MAY CLUMP TOGETHER--WITH OR WITHOUT
OLIVINE--TO FORM GLOMEROPHENOCRYSTS;
OLIVINE
Size(mm): TO 3X3
FRESH EXCEPT FOR GREEN SMECTITE ALONG CRACKS,
COMMONLY APPEARS AS HOLES DUE TO PLUCKING:
PLUCKING IS DUE TO THE ALTERATION TO SMECTITE;
Groundmass : PYROXENE
Replacement: SMECTITE
Minerals Replaced: OLIVINE
FERROUS OXIDE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 930/1080 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 127.58
Core: 4 Top of Core Depth (m) : 126.50
Sect: 1 Top of Section Depth(m): 127.43
LITHOLOGY: DIABASE;
Piece No. : PCE 1 (93-95), 2 (94-100), 3 (100-108);
Structure : PCES 1&2 ARE SEPARATED BY A JOINT DIPPING 10 DEGREES
& FILLED WITH INTERLAYERED CARBONATE & DARK GREEN
WAXY SMECTITE, PCES 2&3 ARE SEPARATED BY A 17 DEGREE
DIPPING JOINT WITHOUT A VEIN, IRREGULAR GENTLE &
MODERATE & STEEP JOINTS IN PCE 3 ARE FILLED WITH
THIN DARK GREEN SMECTITE FILMS (SKETCH OF JOINTS ON
Leg : 34 Top/Bottom Interval(mm): 930/1080 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 127.58
Core: 4 Top of Core Depth (m) : 126.50
Sect: 1 Top of Section Depth(m): 127.43
LITHOLOGY: SHIPBOARD FORM);
Groundmass : OLIVINE
Replacement: CARBONATE
SMECTITE
Minerals Replaced: OLIVINE
Leg : 34 Top/Bottom Interval(mm): 1090/1110 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 127.61
Core: 4 Top of Core Depth (m) : 126.50
Sect: 1 Top of Section Depth(m): 127.59
LITHOLOGY: DIABASE;
Piece No. : PCE 4 (109-111);
Structure : CARBONATE + GREEN SMECTITE VEIN ON ONE SURFACE;
Comments : CONSISTS OF SMALL LOOSE PIECES IN BAG - ITS POSITION
IN CORE IS UNCLEAR;
Replacement: CARBONATE
SMECTITE
Leg : 34 Top/Bottom Interval(mm): 1110/1270 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 127.77
Core: 4 Top of Core Depth (m) : 126.50
Sect: 1 Top of Section Depth(m): 127.61
LITHOLOGY: DIABASE;
Piece No. : PCE 5 (111-119), 6 (111-119), 7 (119-127);
Structure : JOINTS BETWEEN PIECES ARE FILLED WITH DARK GREEN
SMECTITE, BOTTOM SURFACE OF PCE 7 IS 8 DEGREE
DIPPING JOINT WITH GREEN SMECTITE & MAY CORRESPOND
TO SIMILAR JOINT AT TOP OF PCE 8;
Alteration : BETWEEN PCES 5&7 CONTACT IS OXIDIZED TO DEEP BROWN
ALTHOUGH THE ADJACENT ROCK SHOWS NO STAIN;
Comments : SKETCH OF PIECE PLACEMENT ON SHIPBOARD FORM;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 1300/1480 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 127.98
Core: 4 Top of Core Depth (m) : 126.50
Sect: 1 Top of Section Depth(m): 127.80
LITHOLOGY: DIABASE;
Piece No. : PCE 8 (130-148);
Structure : INCIPIENT CRACK WITH VERY SLIGHT BROWN STAIN NEAR
TOP, INTERVAL 136-138CM CONTAINS JOINT DIPPING 15
DEGREES & COATED WITH SMECTITE WHICH IS PARTLY DARK
GREEN BUT MOSTLY OXIDIZED DARK BROWN AS BETWEEN
PCES 5&7, SMALL DISCONTINUOUS DARK GREEN CRACK NEAR
142CM, CRACK ALONG EDGE OF BROWN STAINED AREA ENDS
WHERE IT JOINS THE STEEP SMECTITE VEIN - IT IS
OXIDIZED DARK BROWN BUT CONTAINS NO VISIBLE VEIN,
ONE VEIN DIPS 8 DEGREES - IT NARROWS & ESSENTIALLY
DIES OUT NEAR THE BOTTOM OF THE PIECE - WITHIN BROWN
STAINED AREA THE VEIN IS OXIDIZED BROWN & ABOVE THAT
AREA IT IS DARK GREEN & IN PART OF THE DARK GREEN
STRETCH HAS INTERLAYERED WHITE CARBONATE;
Alteration : BROWN-STAINED AREA ON LOWER PART IS UNRELATED TO
ANY VISIBLE JOINT EXCEPT ALONG ITS LOWER RIGHTHAND
EDGE, SLIGHT BROWN STAIN IN HOST ROCK ADJACENT TO
136-138CM JOINT;
Comments : THE RELATIONS HERE & IN PCES 5-7 SUGGEST GREEN
SMECTITE & CARBONATE DEVELOPED EARLY & THE OXIDATION
& BROWN STAINING OCCURRED LATER, SKETCH ON SHIPBOARD
FORM;
Replacement: SMECTITE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 0/1380 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 129.88
Core: 5 Top of Core Depth (m) : 128.50
Sect: 1 Top of Section Depth(m): 128.50
LITHOLOGY: PLAG-OL APHYRIC TO SPARSELY PHYRIC BASALT;
DIABASE;
MASSIVE;
Piece No. : PCE 1 (17-24), 2 (26-32), 3 (34-42), 4 (44-55),
5 (52-61), 6 (61-70), 7 (70-78), 8 (78-92),
9 (94-108), 10 (111-115), 11 (111-115),
12 (117-127), 13 (117-127), 14 (129-139);
Texture : FROM 17-115CM THE ROCK GRADES ERRATICALLY FROM FINE-
GRAINED DIABASE TO COARSE-GRAINED BASALT BELOW WHICH
(IN 117-138CM) IT GRADES PROGRESSIVELY FROM COARSE
TO MEDIUM TO FINE-GRAINED BASALT, LOCAL SWIRLY
PILOTAXITIC FLOW STRUCTURE IS PRESENT IN INTERVAL
117-127CM NEAR THE LOWER CONTACT - IT IS
COMPLEMENTARY TO THE PILOTAXITIC FLOW STRUCTURE SEEN
IN UPPER PART OF THIS COOLING UNIT IN THE LOWER PART
OF 319A-3-5 - IN BOTH PLACES THE FLOW STRUCTURE IS
BEST SEEN IN THIN SECTION OR ON THE ABRADED SURFACE
OF THE CORE--IT IS NOT VISIBLE ON FRESH FRACTURES -
FLOWAGE FEATURES ARE UNCOMMON OR RARE IN SUBMARINE
PILLOWS: PERHAPS THEY WILL BE FOUND TO BE MORE
COMMON IN THE MASSIVE UNPILLOWED LOWER PARTS OF
SUBMARINE FLOWS & MAY PROVIDE ONE CRITERION FOR
DISTINGUISHING FLOWS FROM SILLS;
Structure : MASSIVE, VEINS & JOINTS ARE LOCALLY UNCOMMON OR
ABSENT AS IN INTERVAL 50-92CM, WHERE PRESENT THE
VEINS INCLUDE YELLOW & BROWN & RED SMECTITE & FE.
OXIDE IN ALTERED ROCK--AND GREEN & BLUE-GREEN
SMECTITE & SULFIDE IN FRESH ROCK--CARBONATE OCCURS
IN BOTH TYPES OF ROCK & WHERE IDENTIFIED IS
GENERALLY ARAGONITE THOUGH CALCITE MAY BE PRESENT AS
WELL, A GREEN SMECTITE VEIN PASSES THROUGH OR NEXT
TO A RELATIVELY FRESH OLIVINE PHENOCRYST;
Alteration : FRESH
FRESH EXCEPT FOR SHORT BROWN ALTERED SEGMENTS IN
INTERVALS 17-21 & 44-46 & 114-115 & 121-138CM, IN
THE GENERALLY FRESH RELATIVELY UNJOINTED INTERVAL
44-92CM SEVERAL CASES OF PREFERENTIAL OXIDATION OF
VEINS ARE NOTEWORTHY: IN THE UPPER FEW
CENTIMETERS IRREGULAR VERY THIN VEINS ARE OXIDIZED
WITH MILD BROWN STAINING OF THE HOST OUT TO ONLY
2-3MM - AT 58-59CM A VEIN OF GREEN SMECTITE IS
OXIDIZED BROWN WITHOUT A VISIBLE STAIN IN THE HOST
ROCK--ARAGONITE OCCURS ONLY IN THE GREEN PART OF
THE VEIN BUT THIS RESTRICTION IS PROBABLY
COINCIDENTAL, AT 117-127CM A VEIN IS COMPLETELY
OXIDIZED TO A BROWN COLOR WHICH EXTENDS A SHORT
DISTANCE ONTO CONTIGUOUS INTERSECTING VEINS WHERE
THE BROWN COLOR IS FAIRLY SHARPLY BOUNDED AGAINST
GREEN SMECTITE - THE ADJACENT HOST ROCK IS
COMPLETELY UNSTAINED, AS IN 319A-4-1 THE VEINS
APPEAR TO HAVE BEEN MORE PERMEABLE THAN HOST ROCK
& DIFFUSION FRONTS IN THE VEINS ARE SHARP - THE
HOST ROCKS' PERMEABILITY APPEARS TO HAVE VARIED
LOCALLY--BEING GREATER WHERE THERE IS A HIGHER
DENSITY OF CRACKS & VEINS EVEN WHERE THE IMMEDIATE
HOST ROCK SHOWS NO VISIBLE CRACK;
Comments : FAIRLY GOOD CORE RECOVERY IN SECTION YEILDS LARGE
PIECES WHICH ARE READILY REFITTED FROM 43-92CM -
THIS YEILD CORRELATES WITH THE FACT THAT THE ROCK IS
GENERALLY DARK GRAY & FRESH EXCEPT FOR THE SHORT
BROWN ALTERED SEGMENTS, STYROFOAM SPACERS EACH ABOUT
2CM WIDE SEPARATE PIECES OF CORE THAT ARE NOT KNOWN
TO BE PART OF A CONTINUOUS CORE SEGMENT - AN UNKNOWN
AMOUNT OF BASALT IS MISSING FROM THE PLACES WHERE
THE STYROFOAM HAS BEEN ADDED, COLOR IS DARK GRAY TO
BROWN;
Vesicles : Size(mm): Percent: TR
Location: PCE 3 Filling:
Shape : ROUND
Size(mm): TO 2X1 Percent:
Location: PCE 14 Filling:
Shape : IRREGULAR
HOLES IN PCE 14 ARE APPARENTLY DEFORMED VESICLES;
Phenocrysts: PLAGIOCLASE ( TR-2%)
PHENOCRYSTS VARY FROM <0.5% TO 2% IN INTERVAL
17-127CM (BUT GENERALLY 1%) TO <0.5% IN INTERVAL
129-138CM (NEAR THE BOUNDARY OF THE COOLING UNIT),
PLAGIOCLASE REACHES MAXIMUM SIZE OF ABOUT 3.5X2.5
& 4X1MM DOWN TO 42CM DEPTH - BELOW 42CM THERE ARE
SCATTERED ONES REACHING SIZES OF 8X2 & 8X4 & 6X5MM
DOWN TO 108CM: THE LARGE ONES MAY HAVE SUNK FROM
HIGHER IN THE UNIT - IN INTERVAL 108-138CM THE
LARGEST CRYSTAL OBSERVED WAS 4.5X2.5MM & GENERALLY
THEY ARE SMALLER THAN 2X1MM HERE;
OLIVINE
WHOLLY REPLACED BY YELLOW & RED SMECTITE IN THE
BROWNISH GRAY ROCK IN INTERVAL 17-24CM & PARTLY TO
WHOLLY BY BLUE-GREEN SMECTITE IN THE FRESH GRAY
ROCK IN INTERVAL 34-65CM - THE PROPORTION OF FRESH
OLIVINE INCREASES GENERALLY WITH DEPTH IN THIS
INTERVAL - FROM 65-108CM FRESH OLIVINE IS COMMON -
FROM 108-138CM EXTENSIVE TO COMPLETE ALTERATION TO
SMECTITE IS AGAIN OBSERVED--THE SMECTITE BEING
BLUE-GREEN IN THE FRESH GRAY ROCK DOWN TO 129CM
(WHERE IT MAY RARELY ENCLOSE A SULFIDE GRAIN) &
RED IN THE ALTERED BROWNISH GRAY ROCK BELOW THAT;
Groundmass : PLAGIOCLASE
RANDOM PLAG LATHS;
Replacement: FERROUS OXIDE
SMECTITE
Minerals Replaced: OLIVINE
SULFIDE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 170/ 240 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 128.74
Core: 5 Top of Core Depth (m) : 128.50
Sect: 1 Top of Section Depth(m): 128.67
LITHOLOGY: PLAG-OLIVINE SPARSELY PHYRIC DIABASE;
Piece No. : PCE 1 (17-24);
Texture : PORPHYRITIC, FINE-GRAINED (FINER THAN THE BOTTOM OF
CORE 4);
Structure : YELLOW & RUSTY BROWN SMECTITE VEINS;
Comments : UNORIENTED ROTATED FRAGMENT, DARK BROWNISH GRAY;
Phenocrysts: PLAGIOCLASE ( 1%)
Size(mm): TO 3.5X2.5
OLIVINE
OLIVINE PHENOCRYSTS ALTERED TO DEEP RED SMECTITE;
Groundmass : OLIVINE
GROUNDMASS OLIVINE ALTERED TO YELLOW SMECTITE;
Replacement: SMECTITE
Minerals Replaced: OLIVINE
Leg : 34 Top/Bottom Interval(mm): 260/ 320 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 128.82
Core: 5 Top of Core Depth (m) : 128.50
Sect: 1 Top of Section Depth(m): 128.76
LITHOLOGY: BASALT;
DIABASE;
Piece No. : PCE 2 (26-32);
Texture : DIABASE IS FINE-GRAINED, BASALT IS COARSE-GRAINED;
Comments : CONSISTS OF FIVE BAGGED LOOSE PIECES: TWO ARE FINE-
GRAINED BROWNISH GRAY DIABASE SIMILAR TO PCE 1 - ONE
IS SOMEWHAT FINER-GRAINED WITH OLIVINE ALTERED TO
DEEP RED SMECTITE & CUT BY A BROWN SMECTITE VEIN -
TWO ARE COARSE-GRAINED PORPHYRITIC BASALT--MUCH
FRESHER--WITH OLIVINE AS PHENOCRYSTS & IN GROUNDMASS
PSEUDOMORPHED BY BLUE-GREEN SMECTITE - NO GLASS BUT
THE LARGER OF THE TWO FRAGMENTS LOOKS LIKE PART OF A
SMALL IRREGULAR COLUMN;
Phenocrysts: OLIVINE
Groundmass : OLIVINE
Replacement: SMECTITE
Minerals Replaced: OLIVINE
Leg : 34 Top/Bottom Interval(mm): 340/ 420 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 128.92
Core: 5 Top of Core Depth (m) : 128.50
Sect: 1 Top of Section Depth(m): 128.84
LITHOLOGY: BASALT;
Piece No. : PCE 3 (34-42);
Texture : COARSE-GRAINED, VARIOLITIC;
Structure : CUT BY VERTICAL BLUE-GREEN SMECTITE VEIN;
Comments : BROKEN ALONG TWO VERTICAL ARTIFICIAL FRACTURES &
UPPER SURFACE IS ALMOST FLAT ARTIFICIAL FRACTURE -
THE FRESH FRACTURES SUGGEST THIS PIECE WAS HIT OR
STRESSED SEVERELY BY THE BIT;
Vesicles : Size(mm): 0.8 Percent:
Location: Filling: EMPTY
Shape : ROUND
ONE VESICLE;
Phenocrysts: PLAGIOCLASE ( <0.5%)
Size(mm): TO 1X4
OLIVINE
OLIVINE LARGELY GONE TO BLUE-GREEN SMECTITE BUT
RARELY CONTAINS FRESH REMNANTS,
ONE IN OILS HAS R.I.'S NEAR 1.689 AND
2V ALMOST 90 BUT (+) - FO 86 OR 87;
Replacement: SMECTITE
Minerals Replaced: OLIVINE
Leg : 34 Top/Bottom Interval(mm): 440/ 920 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 129.42
Core: 5 Top of Core Depth (m) : 128.50
Sect: 1 Top of Section Depth(m): 128.94
LITHOLOGY: PLAG-OLIVINE SPARSELY PHYRIC BASALT;
DIABASE;
Piece No. : PCE 4 (44-55), 5 (51-61), 6 (61-70), 7 (70-78),
8 (78-92);
Texture : FINE-GRAINED DIABASE OR COARSE-GRAINED BASALT AT TOP
AND DISTINCTLY COARSER BUT STILL A FINE-GRAINED
DIABASE AT BOTTOM;
Structure : BOTTOM OF PCE 8 CONTAINS 40 DEGREE DIPPING VEIN & A
FLAT ONE - BOTH HAVE VERY THIN FILMS OF DARK GREEN
SMECTITE, JOINTS & VEINS COMMON IN PCES 4&5 & AT
BOTTOM OF PCE 8 WHEREAS PCES 6&7 & UPPER 2/3 OF
PCE 8 ARE JOINT-FREE - IN PCES 4&5 THEY VARY FROM
GENTLE TO STEEP, THE MOST PROMINENT VEIN DIPS 15
DEGREES & IS AT THE CONTACT OF PCES 4&5 & IS ABOUT
1MM THICK & SOMEWHAT ANASTOMOSING - DARK GREEN TO
BROWN - CARBONATE IS RESTRICTED TO THE DARK GREEN
PART--THIS CONTRASTS WITH HIGHER CORE WHERE
CARBONATE CORRELATED WITH BROWN STAINING & OXIDATION
HOWEVER THIS CARBONATE IS COLORLESS GLASSY CLEAR &
RELATIVELY COARSELY CRYSTALLINE LIKE ARAGONITE
(CONFIRMED BY A GRAIN MOUNT);
Alteration : THE UPPERMOST PART OF PCE 4 IS VAGUELY BROWN-
STAINED FOR 1-3CM BUT THE CONTROLLING FRACTURE IS
NOT VISIBLE - OTHER THAN THIS SOME BROWN
COLORATION IS SEEN ALONG SOME FINE VEINS &
DISCONTINUOUSLY ALONG THEM WITH ALMOST NO
DISCOLORATION OF HOST ROCK (EXCEPT FOR BROWN STAIN
IN HOST FOR A FEW MILLIMETERS), VEINS ARE CLEARLY
THE LOCI OF PREFERENTIAL OXYGEN ENTRY & THE
OXIDATION IS IN AN INCIPIENT STAGE;
Phenocrysts: PLAGIOCLASE ( 1-2%)
Size(mm): TO 2.5X2.5
RARELY (AS AT 68CM) UP TO 8X2MM, IN BOTTOM 5CM
COARSER ON AVERAGE & COMMONLY 2X2 UP TO 3X3MM -
THIS SUGGESTS SETTLING OR LONGER GROWTH TIME;
OLIVINE
LESS ABUNDANT THAN PLAGIOCLASE, FRESH BOTTLE GREEN
AT BASE, GENERALLY PSEUDOMORPHED BY BLUE-GREEN
SMECTITE AT TOP BUT OCCASIONALLY FRESH FOR NO
OBVIOUS REASON EXCEPT PERHAPS DISTANCE FROM
SMECTITE VEINS--THOUGH THE CORRELATION IS VAGUE &
INCONSISTENT, DOMINANTLY PSEUDOMORPHS GIVE WAY TO
MOSTLY FRESH OLIVINE AT ABOUT 65CM;
Replacement: SMECTITE
Minerals Replaced: OLIVINE
ARAGONITE
CARBONATE
HYPOTHESIS: CARBONATE CONTEMPORANEOUS WITH GREEN
SMECTITE WILL BE ARAGONITE DUE TO HIGH MAGNESIUM
CONCENTRATION - THIS PROBABLY CORRELATES WITH LOW
OXYGEN &/OR THE ALTERATION OF MESOSTASIS
& OLIVINE - WHEN MESOSTASIS & OLIVINE ARE GONE THE
RATE OF PRODUCTION OF SOLUBLE MAGNESIUM IS REDUCED
& MAGNESIUM-POISONING IS LESS EFFECTIVE SO CALCITE
CAN PRECIPITATE - THE EFFECT OF OXYGEN IS HARD TO
UNDERSTAND & MAY BE COINCIDENTAL SIMPLY IN THAT--
BY THE TIME STRONG OXIDIZING EFFECTS ARE SEEN--ALL
OLIVINE & MESOSTASIS ARE GONE ANYWAY;
Leg : 34 Top/Bottom Interval(mm): 940/1080 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 129.58
Core: 5 Top of Core Depth (m) : 128.50
Sect: 1 Top of Section Depth(m): 129.44
LITHOLOGY: PLAG-OLIVINE SPARSELY PHYRIC DIABASE;
Piece No. : PCE 9 (94-108);
Texture : FINE-GRAINED;
Structure : TWO STEEP CURVED JOINTS DIPPING 55 TO 65 DEGREES,
BOTTOM = FLAT VEIN OF SMECTITE + CARBONATE
(ARAGONITE AGAIN);
Comments : TOP SURFACE IS FLAT GREEN SMECTITE FILM, GRAY COLOR;
Phenocrysts: PLAGIOCLASE ( 1%)
Size(mm): TO 8X4
MORE PLAG THAN OLIVINE, PLAG TO 8X4 & 6X5MM;
OLIVINE
OLIVINE IS FRESH;
Replacement: SMECTITE
ARAGONITE
Comments : PCE 10 IS SMALL & IN A BAG;
Leg : 34 Top/Bottom Interval(mm): 1110/1150 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 129.65
Core: 5 Top of Core Depth (m) : 128.50
Sect: 1 Top of Section Depth(m): 129.61
LITHOLOGY: PLAG-OLIVINE SPARSELY PHYRIC BASALT;
Piece No. : PCE 11 (111-115);
Texture : COARSE-GRAINED;
Structure : FLAT CARBONATE VEIN ON BOTTOM, 45 DEGREE DIPPING
BLUE-GREEN SMECTITE VEIN NEAR BOTTOM, VERTICAL VEIN
MAINLY OXIDIZED DARK BROWN BUT TOP PART IS THIN
BLUE-GREEN SMECTITE FILM SPECKLED WITH PYRITE
(ID UNCERTAIN - YELLOW METALLIC);
Comments : MAINLY GRAY BUT SLIGHTLY BROWN-STAINED ON BOTTOM;
Phenocrysts: PLAGIOCLASE ( 1%)
Size(mm): TO 2X2
OLIVINE
FRESH TO PSEUDOMORPHED BY BLUE-GREEN SMECTITE;
Groundmass : OLIVINE
ONE FRESH OLIVINE GRAIN APPEARS THROUGH THE BLUE-
GREEN SMECTITE IN THE SMECTITE FILM;
Replacement: SMECTITE
Minerals Replaced: OLIVINE
CARBONATE
THE FLAT CARBONATE VEIN IS DENSE WHITE;
ARAGONITE
RARE LARGE GRAINS ARE ARAGONITE BUT THEY MAY BE
CONTAMINATION;
Leg : 34 Top/Bottom Interval(mm): 1170/1270 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 129.77
Core: 5 Top of Core Depth (m) : 128.50
Sect: 1 Top of Section Depth(m): 129.67
LITHOLOGY: PLAG-OLIVINE SPARSELY PHYRIC BASALT;
Piece No. : PCE 12 (117-127), 13 (117-127);
Texture : VARIES DOWNWARD FROM COARSE TO MEDIUM-GRAINED
VARIOLITIC, LOCALLY HAS A SWIRLY OR PILOTAXITIC
FLOW STRUCTURE;
Structure : PENETRATIVE JOINTS LINED BY BLUE-GREEN SMECTITE +
PYRITE DIP 60 & 40 & 40 DEGREES, AN 85 DEGREE
DIPPING JOINT IS OXIDIZED BROWN & THE BROWN
COLORATION EXTENDS 2-4MM INTO THE SURFACES OF THE
UNOXIDIZED VEINS WHERE THEY INTERSECT THE STEEP ONE;
Phenocrysts: PLAGIOCLASE ( 1%)
Size(mm): TO 2.5X4.5
GENERALLY 1X2 OR SMALLER;
OLIVINE
BLUE-GREEN SMECTITE PSEUDOMORPHS AFTER OLIVINE
RARELY ENCLOSING A PYRITE GRAIN THOUGH THE
SMECTITE-PYRITE COMPOSITES MAY BE AMYGDULES;
Replacement: PYRITE
SMECTITE
Minerals Replaced: OLIVINE
Leg : 34 Top/Bottom Interval(mm): 1290/1390 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 129.89
Core: 5 Top of Core Depth (m) : 128.50
Sect: 1 Top of Section Depth(m): 129.79
LITHOLOGY: BASALT;
Piece No. : PCE 14 (129-139);
Texture : THE THREE-FRAGMENT PIECE (INCLUDING PCE 15) IS FINE-
GRAINED MICROPHYRIC;
Structure : ONE FLAT REMNANT OF A CARBONATE VEIN;
Comments : DARK BROWNISH GRAY, COLOR ZONES IN PCE 14 INDICATE
THAT THIS PIECE IS FROM A JOINT-BOUNDED BLOCK;
Vesicles : Size(mm): <0.5 Percent:
IRREGULAR HOLES RARELY HAVE PROJECTING CRYSTALS &
ARE MORE LIKE DEFORMED VESICLES THAN VUGS;
Phenocrysts: PLAGIOCLASE ( <0.5%)
Size(mm): TO 3.5X2
MICROPHENOCRYSTS;
OLIVINE
SPARSE YELLOW TO RED PSEUDOMORPHS AFTER OLIVINE;
Replacement: SMECTITE
Minerals Replaced: OLIVINE
DARK BROWN OXIDIZED SMECTITE ON ONE VERTICAL
JOINT FACE & YELLOW TO RED SMECTITE ON ANOTHER
VERTICAL FACE;
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 1410/1480 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 129.98
Core: 5 Top of Core Depth (m) : 128.50
Sect: 1 Top of Section Depth(m): 129.91
LITHOLOGY: BASALT;
SIMILAR TO PCE 14;
Piece No. : PCE 15 (141-148);
Texture : FINE-GRAINED, MICROPHYRIC, GRAIN SIZE INCREASES
SLIGHTLY DOWNWARD INDICATING THAT THIS IS NEAR THE
TOP OF A COOLING UNIT;
Structure : NUMEROUS VEINS--MOSTLY VERTICAL BUT SOME GENTLE TO
FLAT--INTERSECT & BRANCH IN A COMPLEX WAY - THEY
VARY FROM CARBONATE TO CARBONATE WITH LIGHT BROWN
SMECTITE WALLS TO DARK BROWN OXIDIZED SMECTITE;
Comments : DARK BROWNISH GRAY, ROCK IS OVERALL BROWN BUT THE
STAIN IS NOT PARTICULARLY MORE INTENSE FARTHER THAN
1MM FROM A VEIN (IF INTENSE COLOR RESTRICTED TO THE
VEIN ITSELF);
Vesicles :
Location: Filling: CARB, SMECTITE
IRREGULAR HOLES IN LOWER PART FILLED WITH GRANULAR
CARBONATE OR RADIAL CARBONATE NEEDLES (ARAGONITE)
OR DARK BROWN-GREEN TO YELLOW BOTRYOIDAL SMECTITE;
Phenocrysts: PLAGIOCLASE ( 0.5%)
Size(mm): TO 2.5X1
MICROPHENOCRYSTS;
OLIVINE
Replacement: SMECTITE
Minerals Replaced: OLIVINE
CARBONATE
ARAGONITE
A GRANULAR CARB FILLING A HOLE IS ARAGONITE,
TWO VEINS ARE MINUTELY FIBROUS AND GIVE
AN AGGREGATE 0 DEGREES 2V(-) BUT THIS
DOES NOT EXCLUDE ARAGONITE, THEY ORIGINALLY
MAY HAVE BEEN BOTRYOIDAL;
Leg : 34 Top/Bottom Interval(mm): 0/ 0 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 130.10
Core: 5 Top of Core Depth (m) : 128.50
Sect: CC Top of Section Depth(m): 130.10
LITHOLOGY: GLASS;
Piece No. : PCE NO PIECE NUMBERS ASSIGNED;
Structure : ONE PALAGONITE FRAGMENT COATED BY DRUSY COLORLESS
VEIN (PROBABLY PHILLIPSITE) AS IN 319A-1-1-CC;
Comments : INCLUDES GLASS & LIGHT TAN TO ORANGE PALAGONITE;
Replacement: GLASS
PALAGONITE
PHILLIPSITE
Leg : 34 Top/Bottom Interval(mm): 0/1500 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 139.50
Core: 6 Top of Core Depth (m) : 138.00
Sect: 1 Top of Section Depth(m): 138.00
LITHOLOGY: BASALT;
Piece No. : PCES 1 (68-74), 2 (76-82), 3 (83-90), 4 (92-97),
5 (100-105), 6 (107-114), 7 (116-120),
8 (122-128), 9 (131-134), 10 (136-140),
11 (142-148);
Texture : THE SMALL HIGHLY ABRADED PIECES OF CORE IN THIS
SECTION MOST OF WHICH CANNOT BE CONFIDENTLY ORIENTED
AS TO TOP AND BOTTOM VARY FROM APHANITIC THROUGH
FINE TO MEDIUM AND COARSE GRAINED BASALT, HOWEVER
THERE IS NO ORDER OR REGULARITY - FINEST GRAINED
ROCK (70-72 CM) IMMEDIATELY OVERLIES THE COARSEST
(74-82 CM) AND BELOW THAT THERE ARE SMALL BUT REAL
VARIATIONS WITHIN A RESTRICTED SIZE RANGE, TEN THIN
SECTIONS OF HOLOCRYSTALLINE ROCK - EIGHT OF THEM
FROM CORE 6 AND ONE EACH FROM THE INTERVAL OF
319-A CORE 5 SECTION 1 (141-148 CM) AND THE HIGHEST
FROM 319-A CORE 7 SECTION 1 (18-22 CM) SHOW SEVEN
REVERSALS OF GRAIN SIZE;
Structure : THE DATA (SEE CODE (T) TEXTURE) ARE INTERPRETED TO
MEAN THAT AS MANY AS FIVE COOLING UNITS PROBABLY
PILLOWS WERE PENETRATED WITH VERY POOR RECOVERY
AND WITHOUT ANY RECOVERY OF GLASSY SELVAGE, IN VIEW
OF THE DRILLING BEHAVIOR OF ROCKS HIGHER IN THE
BASEMENT OF HOLE 319-A AND GIVEN THE EVIDENCE IN
CUTTINGS FROM THE CENTER BIT (RECOVERED WITH A
CENTER BIT AFTER CORE 7 AND IMMEDIATELY PRIOR TO
ABANDONING THE SITE) FOR HIGH POROSITY IN ZONES OF
GLASSY SELVAGES THE POOR RECOVERY IS NOT UNEXPECTED
FROM A PILE OF POORLY CEMENTED PILLOWS, THE
THE POROSITY ALLOWS THE CLOSELY SPACED COOLING AND
TECTONIC CRACKS IN SUCH PILLOWS TO OPEN DURING
DRILLING THEREBY ALLOWING SMALL JOINT BLOCKS TO BE
DISLODGED - ROTATED AND ULTIMATELY ABRADED TO SMALL
SIZES, ONLY THE RELATIVELY LARGE BLOCKS FROM THE
INTERIORS OF THE PILLOWS ARE LIKELY TO SURVIVE AND
MOSTLY THOSE FROM THE DEEPEST PILLOWS DRILLED LAST,
TINY HOLES IN THE PIECE FROM THE INTERVAL 116 TO
120 CM CONTAIN YELLOW-TAN AND BLUE SMECTITE, VEINS
INCLUDE YELLOW + BROWN + RED + BLUE + YELLOWISH
WHITE SMECTITE + MN OXIDE + FE OXIDE AND CARBONATE,
THE FE OXIDE IN VEINS IN THE INTERVAL 122 TO 127 CM
HAS AN OCHRE STREAK AND MAY BE GOETHITE, CARBONATE
VEINS ARE UNCOMMON (SEEN ONLY IN THE INTERVAL
100 TO 113 CM) AND WHERE EXAMINED IN INDEX OILS
APPEAR TO BE CALCITE, MINOR ARAGONITE MAY BE
PRESENT BUT THAT IS UNCERTAIN;
Alteration : THE ALTERATION PRODUCTS ARE FE OXIDE AND SMECTITES
WITH VARIABLE COLORS WHICH INCLUDE BROWN + RED +
YELLOW + GREENISH YELLOW AND RARELY DARK GREEN TO
TO BLUE, APPARENTLY THE OLIVINES WERE ALTERED WHEN
THE ROCKS WERE IN A HIGHLY OXYGENATED ENVIRONMENT
IN WHICH THE QUENCHED HOST ROCKS WERE NOT ATTACKED
SO SEVERELY AS THE OLIVINES, THIS WAS PROBABLY
OXYGENATED BOTTOM WATERS WITH WHICH THE PILLOWS
INTERACTED BEFORE BURIAL, IN BROWN ALTERED ROCKS
THE OLIVINE IS CONVERTED ALMOST EXCLUSIVELY TO
EARTHY RED FE OXIDE RARELY WITH A LIGHT COLORED
SMECTITE RIM, IN THE ADJACENT FRESH ROCK YELLOW +
GREEN + OR BLUE SMECTITE PSEUDOMORPHS OCCUR,
GIVEN THE READY AVAILABILITY OF OXYGEN THE FE
CONTENT OF THE OLIVINE IS OXIDIZED AND
REPRECIPITATED AS AN OXIDE OF HYDRATED OXIDE, THE
MG IS EITHER REMOVED OR PRECIPITATED IN A SMECTITE
WHICH MUST BE CONSIDERABLY RICHER IN MG AND POORER
IN FE THAN THE GREEN AND BLUE-GREEN SMECTITES
OBSERVED IN FRESH GRAY ROCKS BOTH HERE AND HIGHER
IN THE BASEMENT;
Comments : THE ROCKS ARE DARK GRAY AND FRESH FROM 70-127 CM
AND PARTLY OR WHOLLY DARK BROWNISH GRAY FROM 130 TO
149 CM, THIS DISTRIBUTION CAN BE INTERPRETED
CONSISTENTLY WITH THE INFERENCES ABOVE IN THAT
HIGHER PIECES ARE REDUCED TO THEIR HARDEST FRESHEST
REMNANTS WHEREAS THE LOWER ONES RETAIN SOME ALTERED
ROCK, THE DISTRIBUTION OF SIZES OF THE PIECES OF
CORE DOES NOT OBVIOUSLY SUPPORT THIS INTERPRETATION;
Phenocrysts: OLIVINE
PLAGIOCLASE
THE ROCKS CONTAIN 0.5 TO 1.0 PERCENT PHENOCRYSTS
AMONG WHICH THE LARGEST PLAGIOCLASES OBSERVED
RANGE FROM 2.5 X 2 UP TO 4.5 X 4 AND 5 X 2.5 MM,
OLIVINE PHENOCRYSTS ARE FRESH TO PARTLY ALTERED
TO WHOLLY ALTERED, IN THE INTERVAL 145-147 CM
SOME OLIVINES CONTAIN OVOID INCLUSIONS OF VERY
FINE GRAINED BASALT WHICH WERE PROBABLY LIQUID
INCLUSIONS TRAPPED BY THE GROWING CRYSTALS;
Replacement: SMECTITE
CARBONATE
ARAGONITE
GOETHITE
Leg : 34 Top/Bottom Interval(mm): 700/ 720 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 138.72
Core: 6 Top of Core Depth (m) : 138.00
Sect: 1 Top of Section Depth(m): 138.70
LITHOLOGY: BASALT;
Piece No. : PCE 1 (70-72);
Texture : UNORIENTED FRAGMENT, APHANITIC PORPHYRITIC DARK GREY
BASALT;
Alteration : FRESH AND ALTERED TO LIGHT GREENISH YELLOWISH
SMECTITE;
Comments : COOLING UNIT BOUNDARY HERE OR BELOW PIECE 2;
Phenocrysts: PLAGIOCLASE
Size(mm): 2.5 X 2
OLIVINE
0.5 PERCENT PHENOS, PLAG UP TO 2.5 X 2 MM,
OL FRESH AND ALTERED TO LIGHT GREENISH YELLOW
SMECTITE, SINGLY OR GLOMEROPHYRIC;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 740/ 820 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 138.82
Core: 6 Top of Core Depth (m) : 138.00
Sect: 1 Top of Section Depth(m): 138.74
LITHOLOGY: BASALT;
Piece No. : PCE 2 (74-82);
Texture : UNORIENTED FRAGMENT, DARK GREY PORPHYRITIC FINE
GRAINED BASALT;
Structure : JOINTS COATED BY BROWN FE OXIDE AND/OR YELLOW
SMECTITE;
Comments : DARK GREY BASALT;
Phenocrysts: PLAGIOCLASE ( 1%)
Size(mm): 4.5 X 4
OLIVINE
1 PERCENT PLAG UP TO 4.5 X 4 MM AND OLIVINE,
OLIVINE - FRESH + DEEP GREENISH YELLOW OR AMBER
RARELY + MOSTLY GONE TO YELLOW OR BROWN SMECTITE
OR RED FE OXIDE;
Replacement: SMECTITE
Minerals Replaced: OL
OLIVINE MOSTLY GONE TO YELLOW OR BROWN SMECTITE OR
RED FE OXIDE;
Leg : 34 Top/Bottom Interval(mm): 840/ 900 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 138.90
Core: 6 Top of Core Depth (m) : 138.00
Sect: 1 Top of Section Depth(m): 138.84
LITHOLOGY: BASALT;
Piece No. : PCE 3 (84-90 CM);
Texture : UNORIENTED FRAGMENT, FINE GRAINED OR APHANITIC
PORPHYRITIC DARK GREY BASALT, FINER GRAINED THAN
PIECE 2;
Structure : ONE JOINT IS STAINED DARK BROWN AND ANOTHER IS
THINLY COATED WITH YELLOW SMECTITE AND IN TURN
COATED LOCALLY BY A HAZY BLUE EARTHY FILM, ONE BIT
MARK IS PARTLY COATED WITH TARNISHED METAL WITH A
DISTINCT COPPER COLOR, THE MARK AND METAL ARE ON A
FRESH FRACTURE AND ARE UNLIKELY TO INDICATE NATIVE
COPPER (SAME SEEN ELSEWHERE BELOW THIS PIECE);
Alteration : FRESH;
Comments : DARK GREY BASALT;
Phenocrysts: PLAGIOCLASE
Size(mm): 5.0 X 3
OLIVINE
1 PERCENT PHENOCRYSTS, PLAG UP TO 5.0 X 3 MM AND
NOTABLY EUHEDRAL AND NO INCLUSIONS, OLIVINE VARIES
FROM FRESH (DEEP GREEN - YELLOW WITH OPALESCENCE)
TO PSEUDOMORPHS OF YELLOW SMECTITE AND RED FE
OXIDE, PLAG AND OL EQUALLY ABUNDANT;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 920/ 980 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 138.98
Core: 6 Top of Core Depth (m) : 138.00
Sect: 1 Top of Section Depth(m): 138.92
LITHOLOGY: BASALT;
Piece No. : PCE 4 (92-98);
Texture : UNORIENTED FRAGMENT, DARK GREY FINE-GRAINED FRESH
PORPHYRITIC BASALT, COARSER GRAINED THAN PCE 3;
Structure : ONE VERY THIN LIGHT REDDISH YELLOW SMECTITE VEIN IN
A DISCONTINUOUS CRACK, EXPOSED JOINTS STAINED DEEP
RED BROWN;
Alteration : FRESH BASALT, DEEP GREENISH YELLOWISH OLIVINE -
GENERALLY FRESH + APPARENTLY MORE ABUNDANT THAN
PLAG;
Comments : DARK GREY BASALT;
Phenocrysts: PLAGIOCLASE
Size(mm): TO 3.5 X 2
OLIVINE
0.5 PERCENT PHENOCRYSTS WITH PLAG UP TO 3.5 X 2 MM
BUT GENERALLY MUCH SMALLER + DEEP GREENISH
YELLOWISH OLIVINE GENERALLY FRESH AND MORE
ABUNDANT THAN PLAG;
Replacement: SMECTITE
IN VEIN;
Leg : 34 Top/Bottom Interval(mm): 1000/1060 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 139.06
Core: 6 Top of Core Depth (m) : 138.00
Sect: 1 Top of Section Depth(m): 139.00
LITHOLOGY: BASALT;
Piece No. : PCE 5 (100-106);
Texture : UNORIENTED FRAGMENT, LIKE PCE 4 OR SLIGHTLY COARSER
GRAINED;
Structure : ONE IRREGULAR SURFACE COATED BY YELLOW SMECTITE
SPOTTED WITH BLACK MN OXIDE, PART OF THE SMECTITE
HAS A FAINT BLUE FILM ON IT, ANOTHER SMALL AREA HAS
REMNANTS OF A CARBONATE VEIN;
Alteration : NO FRESH OLIVINE - ONLY FE OXIDE OR SMECTITE
PSEUDOMORPHS;
Comments : COOLING UNIT BOUNDARY BETWEEN PCES 5 AND 6;
Phenocrysts: PLAGIOCLASE
Size(mm): TO 3 X 3
OLIVINE
LESS THAN 0.5 PERCENT PHENOS, PLAG UP TO 3 X 3 MM
WITH NO FRESH OLIVINE ONLY FE OXIDE OR SMECTITE
PSEUDOMORPHS;
Replacement: SMECTITE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 1080/1130 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 139.13
Core: 6 Top of Core Depth (m) : 138.00
Sect: 1 Top of Section Depth(m): 139.08
LITHOLOGY: BASALT;
Piece No. : PCE 6 (108-113);
Texture : UNORIENTED FRAGMENT, APHANITIC DARK GRAY PORPHYRITIC
BASALT;
Alteration : VERY FRESH, OLIVINE RARELY FRESH BUT MOSTLY GONE
TO DEEP RED FE OXIDES;
Comments : VARIOUS SURFACES ARE COATED BY YELLOWISH WHITE
SMECTITE - BLACK MN OXIDE - WHITE OR COLORLESS CARB
OR RED BROWN FE OXIDE;
Phenocrysts: PLAGIOCLASE
Size(mm): TO 5 X 2.5
OLIVINE
0.5 TO 1 PERCENT PHENOS, PLAG UP TO 5 X 2.5 MM,
OLIVINE RARELY FRESH BUT MOSTLY GONE TO DEEP RED
FE OXIDES;
Replacement: SMECTITE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 1160/1200 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 139.20
Core: 6 Top of Core Depth (m) : 138.00
Sect: 1 Top of Section Depth(m): 139.16
LITHOLOGY: BASALT;
Piece No. : PCE 7 (116-120);
Texture : UNORIENTED FRAGMENT, FINE GRAINED FRESH DARK GRAY
PORPHYRITIC BASALT, COARSER THAN PIECE 6;
Structure : ONE RUST STAINED JOINT;
Alteration : FRESH BASALT, OLIVINE ALTERED TO RED FE OXIDE OR
YELLOW-TAN SMECTITE;
Comments : DARK GRAY PORPHYRITIC BASALT,
TINY IRREGULAR HOLES - VERY RARE EMPTY OR PARTLY
FILLED WITH BANDED YELLOW-TAN + LIGHT BLUE
SMECTITE;
Phenocrysts: PLAGIOCLASE
Size(mm): TO 4 X 2
OLIVINE
1 PERCENT PHENOS, PLAG UP TO 4 X 2 MM, OLIVINE
ALTERED TO RED FE OXIDE OR YELLOW-TAN SMECTITE,
PHENOCRYSTS TYPICALLY GLOMERATIC;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 1220/1270 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 139.27
Core: 6 Top of Core Depth (m) : 138.00
Sect: 1 Top of Section Depth(m): 139.22
LITHOLOGY: BASALT;
Piece No. : PCE 8 (122-127);
Texture : UNORIENTED FRAGMENT, FINE GRAINED FRESH DARK GRAY
PORPHYRITIC BASALT;
Structure : THIN DARK BROWN VEINS (0.2 MM) WITH POSSIBLY
SMECTITE OR GOETHITE OF AT LEAST 2 ORIENTATIONS;
Alteration : FRESH DARK GRAY BASALT;
Comments : DARK GRAY BASALT;
Phenocrysts: PLAGIOCLASE
Size(mm): TO 4 X 2.5
OLIVINE
1 PERCENT PHENOS, PLAG UP TO 4 X 2.5 MM, OLIVINE
WHOLLY GONE TO WAXY RED SMECTITE OR EARTHY RED FE
OXIDE;
Replacement: SMECTITE
GOETHITE
IDENTIFICATION UNCERTAIN;
Leg : 34 Top/Bottom Interval(mm): 1300/1330 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 139.33
Core: 6 Top of Core Depth (m) : 138.00
Sect: 1 Top of Section Depth(m): 139.30
LITHOLOGY: BASALT;
Piece No. : PCE 9 (130-133);
Texture : UNORIENTED FRAGMENT, FINE GRAINED DARK BROWNISH GRAY
BASALT;
Comments : DARK BROWNISH GRAY BASALT;
Phenocrysts: PLAGIOCLASE
Size(mm): TO 2 X 2.5
OLIVINE
1 PERCENT PHENOS, OL MORE ABUNDANT THAN PLAG,
OLIVINE WHOLLY GONE TO WAXY RED SMECTITE AND LESS
COMMONLY YELLOW SMECTITE, PLAG AND OL COMMONLY
GLOMEROPHYRIC;
Replacement: SMECTITE
Minerals Replaced: OL
OLIVINE WHOLLY GONE TO WAXY RED SMECTITE AND LESS
COMMONLY YELLOW SMECTITE;
Leg : 34 Top/Bottom Interval(mm): 1350/1380 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 139.38
Core: 6 Top of Core Depth (m) : 138.00
Sect: 1 Top of Section Depth(m): 139.35
LITHOLOGY: BASALT;
Piece No. : PCE 10 (135-138);
Texture : UNORIENTED FRAGMENT, MEDIUM GRAINED GRAY PORPHYRITIC
BASALT;
Alteration : FRESH TO ALTERED AND BROWNISH, IN ALTERED PART
OLIVINE IS GONE TO EARTHY FE OXIDE, IN FRESHER
PART IT IS ALTERED TO YELLOW SMECTITE OR A MESH
WORK OF YELLOW SMECTITE WITH DARK GREEN TO LIGHT
BLUE-GREEN CORES;
Comments : GRAY BASALT;
Phenocrysts: PLAGIOCLASE
OLIVINE
1 PERCENT PHENOS, OL MORE ABUNDANT THAN PLAG,
OFTEN GLOMEROPHYRIC, IN ALTERED PART OLIVINE
IS GONE TO EARTHY FE OXIDE, IN FRESHER PART OL IS
ALTERED TO YELLOW SMECTITE, RARE REMNANT OLIVINE
IS DEEP YELLOWISH BROWN;
Replacement: SMECTITE
Minerals Replaced: OL
IN FRESHER PART OL IS ALTERED TO YELLOW SMECTITE;
Leg : 34 Top/Bottom Interval(mm): 1410/1490 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 139.49
Core: 6 Top of Core Depth (m) : 138.00
Sect: 1 Top of Section Depth(m): 139.41
LITHOLOGY: BASALT;
Piece No. : PCE 11 (141-149);
Texture : ONLY ORIENTED PIECE, MEDIUM OR COARSE GRAINED
PORPHYRITIC BASALT;
Structure : STEEP TO VERTICAL DISCONTINUOUS CRACKS ARE FILLED
WITH YELLOW SMECTITE + YELLOWISH WHITE SMECTITE OR
BROWN SMECTITE WITH BLUISH FILM ALONG ONE WALL;
Alteration : OLIVINE LARGELY ALTERED TO YELLOW SMECTITE EXCEPT
AT BOTTOM TO EARTHY RED FE OXIDE, NO FRESH
OLIVINE;
Comments : YELLOWISH GRAY TO BROWNISH GRAY BASALT;
Phenocrysts: PLAGIOCLASE
Size(mm): TO 5 X 1
OLIVINE
1 PERCENT PHENOS, OL MORE ABUNDANT THAN PLAG,
PLAG UP TO 5 X 1 MM, OLIVINE LARGELY ALTERED
TO YELLOW SMECTITE EXCEPT AT BOTTOM TO EARTHY
RED FEOXIDE, NO FRESH OLIVINE, LITTLE TENDENCY TO
GLOMEROPHYRIC CLUSTERING;
Replacement: SMECTITE
Minerals Replaced: OL
OLIVINE LARGELY ALTERED TO YELLOW SMECTITE EXCEPT
AT BOTTOM TO EARTHY RED FE OXIDE;
Leg : 34 Top/Bottom Interval(mm): 0/1500 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 149.00
Core: 7 Top of Core Depth (m) : 147.50
Sect: 1 Top of Section Depth(m): 147.50
LITHOLOGY: BASALT;
Piece No. : PCES 1 (13-20), 2 (22-28), 3 (29-34), 4 (36-42),
5 (44-49), 6 (50-59), 7 (61-72), 8 (73-80),
9 (83-85), 10 (87-93), 11 (94-100), 12 (101-108),
13 (101-107), 14 (105-109), 15 (104-109),
16 (111-118), 17 (120-126), 18 (128-133),
19 (134-140), 20 (143-149);
Texture : THIS CORE RECOVERED SMALL PIECES OF BASALT THAT
COMMONLY HAD ROTATED AND CANNOT BE CONFIDENTLY
REORIENTED, THEY ARE COMMONLY UNJOINTED OR SPARSELY
JOINTED REMNANTS OF JOINT BLOCKS THE ORIGINAL SHAPES
OF WHICH CAN OFTEN BE INFERRED FROM THE DISTRIBUTION
OF ALTERATION AND COLOR ZONES, THEY GRADE IN A
GENERAL BUT NOT WHOLLY REGULAR WAY FROM MEDIUM TO
COARSE GRAINED BASALT AT 18 CM TO COARSE GRAINED
BASALT FROM 31 TO 47 CM TO COARSE TO VERY COARSE
GRAINED BASALT IN THE INTERVAL 47-141 CM AND FINALLY
TO VERY FINE GRAINED BASALT IN THE INTERVAL 143-148
CM, ALL THE PIECES ARE TENTATIVELY ASSIGNED TO A
SINGLE COOLING UNIT WHICH SEEMS UNLIKELY IN VIEW
OF THE FINE GRAIN SIZE;
Structure : VEINS ARE COMPOSED OF YELLOW + RED + RED-BROWN +
BROWN + ORANGE-BROWN + BLUE + GREENISH-YELLOW +
GREEN + BLUE-GREEN SMECTITE + FE OXIDE + CALCITE +
ARAGONITE AND PHILLIPSITE, THE GREEN AND BLUE-GREEN
SMECTITES OCCUR ALONG WITH SIMILARLY COLORED
SMECTITE PSEUDOMORPHS AFTER OLIVINE IN FRESH GRAY
ROCKS AND ALTERED BROWN ROCKS, AT 106 TO 110 CM A
MODERATELY INCLINED GREEN SMECTITE PLUS ARAGONITE
VEIN WITH LESSER YELLOW AND RED-BROWN SMECTITE AND
FE OXIDE HAS A STRIATED SILKY SHEEN IF SHEARED,
HOWEVER THIS MAY BE DUE TO THE SURFACE MORPHOLOGY
OF GREEN SMECTITE DEPOSITED ON A SLANT FIBER LAYER
OF ARAGONITE, IN THE INTERVAL 99 TO 93 CM A YELLOW
SMECTITE VEIN IS PARTIALLY COATED BY RADIALLY
ARRANGED DARK OPAQUE PRISMS THAT SEEM TO BE MOLDS
OF SOME FORMER PRISMATIC MINERAL, THE SHAPES AND
SIMILARITIES TO THE OCCURRENCE IN 319A SECTIONS 2
AND 3 (39-43CM) SUGGEST THAT THE PRISMS WERE
ARAGONITE;
Alteration : FRESH DARK GRAY TO ALTERED DARK BROWNISH GRAY
BASALT, THE PIECES ARE COMMONLY UNJOINTED OR
SPARSELY JOINTED REMNANTS OF JOINT BLOCKS WHERE
THE ORIGINAL SHAPES OF WHICH CAN OFTEN BE INFERRED
FROM THE DISTRIBUTION OF ALTERATION AND COLOR
ZONES, PSEUDOMORPHS AFTER OLIVINE ARE COMPOSED
OF YELLOW + RED + BROWN + GREENISH YELLOW + GREEN
+ BLUE GREEN + YELLOWISH WHITE AND WHITE SMECTITE,
OTHER PSEUDOMORPHS AFTER OLIVINE INCLUDE FE OXIDE
CALCITE + MINOR ARAGONITE, THE GREEN AND BLUE-
GREEN SMECTITES OCCUR ALONG WITH SIMILARLY COLORED
SMECTITE PSEUDOMORPHS AFTER OLIVINE IN FRESH GRAY
ROCKS AND ALTERED BROWN ROCKS;
Comments : DARK GRAY TO ALTERED DARK BROWNISH GRAY BASALT,
EVIDENCE THAT CORE 7 REPRESENTS A COOLING UNIT;
Vesicles : Size(mm): 1.3 Percent:
Location: Filling: SMEC, ARAGONITE
Shape : ELONGATE
A VESICLE (1.3 MM IN DIAMETER) AND IRREGULAR
ELONGATE HOLES ARE SEEN IN THE INTERVAL 38 TO 45
CM, THE HOLES CONTAIN RED SMECTITE LININGS AND
SOME CONTAIN ARAGONITE IN ADDITION;
Location: Filling: ARAGONIT, CALCITE
Shape : ELONGATE
Location: Filling: SMEC, CARBONATES
IRREGULAR HOLES AND VUGS COMMONLY ELONGATE
VERTICALLY IN THE INTERVAL 54 TO 80 CM ARE FILLED
OR LINED BY RADIAL OR COARSELY GRANULAR ARAGONITE
+ CONICAL CALCITE CRYSTALS + GREEN OR YELLOW OR
OR BROWN SMECTITE;
Phenocrysts: OLIVINE
PLAGIOCLASE
ABUNDANCES OF OLIVINE AND PLAGIOCLASE PHENOCRYSTS
ARE LESS THAN 0.5 PERCENT TO 1.0 PERCENT FROM
18 TO 51 CM+ ALMOST 0.0 TO 0.5 PERCENT FROM 54 TO
110 CM + 2.0 PERCENT TO 1.5 PERCENT FROM 114 TO
129 CM AND 1.0 PERCENT FROM 131 TO 149 CM, THE
INTERVAL 114 TO 129 CM MAY BE A CUMULATE ZONE
COMPLEMENTARY TO THE RELATIVELY DEPLETED ZONE FROM
54 TO 110 CM AND IF SO SUPPORTS THE IDEA THAT CORE
7 REPRESENTS ESSENTIALLY A SINGLE COOLING UNIT,
MAXIMUM PLAG SIZES RANGE FROM 2.5 X 1.5 TO 6 X 4
AND 5 X 3.5 MM, BELOW ABOUT 124 CM PLAG IS
GENERALLY SMALLER THAN 2 X 1 MM EXCEPT FOR
SCATTERED LARGE ONES,OLIVINE PHENOCRYSTS ARE UP TO
6 X 4 MM IN SIZE BUT COMMONLY MUCH SMALLER,
PSEUDOMORPHS AFTER OLIVINE ARE COMPOSED OF YELLOW
+ RED + BROWN + GREENISH YELLOW + GREEN + BLUE-
GREEN + YELLOWISH WHITE AND WHITE SMECTITE,
OTHER PSEUDOMORPHS AFTER OLIVINE ARE FE OXIDE +
CALCITE + MINOR ARAGONITE;
Replacement: CALCITE
SMECTITE
ARAGONITE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 180/ 220 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 147.72
Core: 7 Top of Core Depth (m) : 147.50
Sect: 1 Top of Section Depth(m): 147.68
LITHOLOGY: BASALT;
Piece No. : PCE 1 (18-22);
Texture : UNORIENTED FRAGMENT, MEDIUM TO COARSE GRAINED
PORPHYRITIC BASALT;
Structure : NO JOINTS OR VEINS;
Alteration : OLIVINE ALTERED TO YELLOW OR RED OR BROWN SMEC OR
TO FE OXIDE, SCATTERED FRESH REMNANT OF OLIVINE;
Comments : DARK GRAY;
Phenocrysts: PLAGIOCLASE
Size(mm): 2.5 X 2.5
OLIVINE
Size(mm): 6.0 X 4.0
1 PERCENT PHENOS, OLIVINE GREATER PERCENTAGE THAN
PLAG, PLAG UP TO 2.5 X 2.5 MM, OLIVINE IS EUHEDRAL
UP TO 6 X 4 MM ALTERED TO YELLOW OR RED OR BROWN
SMEC OR TO EARTHY FE OXIDE, SCATTERED FRESH
REMNANT OF OLIVINE, OL AND PLAG MAY BE
GLOMEROPHYRIC BUT MOSTLY ISOLATED;
Replacement: SMECTITE
Minerals Replaced: OL
OL ALTERED TO SMEC;
Leg : 34 Top/Bottom Interval(mm): 240/ 290 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 147.79
Core: 7 Top of Core Depth (m) : 147.50
Sect: 1 Top of Section Depth(m): 147.74
LITHOLOGY: BASALT;
Piece No. : PCE 2 (24-29);
Texture : UNORIENTED FRAGMENT, MEDIUM TO COARSE GRAINED
BASALT;
Structure : TIGHT NON-PENETRATIVE CRACKS OF SEVERAL ORIENTATIONS
+ SLIGHTLY STAINED (OR FILLED BY PAPER THIN VEINS)
IN SOME CASES, REMNANTS OF BROWN FE OXIDE STAINED
JOINTS ON SOME SURFACES;
Alteration : OLIVINE FRESH TO PARTLY ALTERED TO WHOLLY REPLACED
BY YELLOW OR RED SMECTITE;
Comments : FRESH DARK GRAY OR SLIGHTLY ALTERED DARK BROWNISH
GRAY BASALT;
Phenocrysts: OLIVINE
PLAGIOCLASE
Size(mm): 5.5 X 3
0.5 PERCENT PHENOS GENERALLY ISOLATED, PLAG UP TO
5.5 X 3.0 MM, OLIVINE FRESH TO PARTLY ALTERED TO
WHOLLY REPLACED BY YELLOW OR RED SMECTITE;
Replacement: SMECTITE
Minerals Replaced: OL
OL FRESH TO PARTLY ALTERED TO WHOLLY REPLACED BY
YELLOW OR RED SMECTITE;
Leg : 34 Top/Bottom Interval(mm): 310/ 350 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 147.85
Core: 7 Top of Core Depth (m) : 147.50
Sect: 1 Top of Section Depth(m): 147.81
LITHOLOGY: BASALT;
Piece No. : PCE 3 (31-35);
Texture : UNORIENTED FRAGMENT, COARSE GRAINED PORPHYRITIC
BASALT (SLIGHTLY COARSER THAN PCE 2);
Structure : NON-PENETRATIVE CRACKS ARE RARE AND STAINED BLUE OR
YELLOW;
Alteration : OLIVINE WHOLLY ALTERED MAINLY TO RED SMECTITE AND
SOME YELLOW SMECTITE;
Comments : DARK BROWNISH GRAY BASALT;
Phenocrysts: OLIVINE
PLAGIOCLASE
Size(mm): 2.5 X 2.0
0.5 PERCENT OR FEWER PHENOS, OLIVINE PERCENTAGE
GREATER THAN PLAG, PHENOS ISOLATED NOT
GLOMEROPHYRIC, PLAG UP TO 2.5 X 2 MM, OLIVINE
WHOLLY ALTERED MAINLY TO RED SMECTITE AND SOME
YELLOW SMECTITE;
Replacement: SMECTITE
Minerals Replaced: OL
OLIVINE WHOLLY ALTERED MAINLY TO RED SMECTITE AND
SOME YELLOW SMECTITE;
Leg : 34 Top/Bottom Interval(mm): 380/ 450 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 147.95
Core: 7 Top of Core Depth (m) : 147.50
Sect: 1 Top of Section Depth(m): 147.88
LITHOLOGY: BASALT;
Piece No. : PCE 4 (38-45);
Texture : ORIENTED FRAGMENT, COARSE GRAINED PORPHYRITIC
BASALT (COARSER THAN PCE 3);
Structure : TOP SURFACE IN PART COVERED BY THIN OPAQUE WHITE
CARB VEIN, STEEPLY DIPPING VEIN (75 DEGREES) IS
COATED BY YELLOW SMECTITE MOTTLED WITH RED, A
VERTICAL JOINT IS COATED BY YELLOW SMECTITE
INTERLAYERED WITH DARK BROWN WAXY SMECTITE AND
PARTLY COATED BY GRANULAR TO ACICULAR COLORLESS
ARAGONITE AND TOWARD BOTTOM OF THE SPECIMEN THIS
VEIN IS OXIDIZED BROWN, A VERY THIN (0.1 - 0.2 MM)
WHITE CARBONATE VEIN CROSSES IRREGULARLY BUT
GENERALLY STEEPLY THROUGH THE SPECIMEN;
Alteration : OLIVINE GENERALLY ALTERED TO RED SMECTITE BUT ONE
PART WITH OLIVINE REMNANTS IS YELLOW SMECTITE;
Comments : DARK BROWNISH GRAY, A VERTICAL JOINT IS COATED WITH
YELLOW SMECTITE INTERLAYERED WITH DARK BROWN WAXY
SMECTITE AND PARTLY COATED BY GRANULAR TO ACICULAR
COLORLESS ARAGONITE;
Vesicles :
Location: 1.3 Filling: CARB, ARAGONITE
Location: Filling: SMECTITE
IRREGULAR HOLES AND ONE ROUND VESICLE (1.3 MM
DIAMETER) FILLED WITH CARBONATE PROBABLY
ARAGONITE, HOLES ARE ELONGATE AND OFTEN FLAT MAY
BE PRIMARY VUGS OR IRREGULAR VESICLES + COMMONLY
HAVE WALL LININGS OF RED SMECTITE;
Phenocrysts: OLIVINE
PLAGIOCLASE
Size(mm): 4.0 X 2.0
0.5 PERCENT ISOLATED PHENOS, OLIVINE GENERALLY
WHOLLY ALTERED TO RED SMECTITE BUT ONE PART WITH
OLIVINE REMNANTS IS YELLOW SMECTITE;
Replacement: SMECTITE
Minerals Replaced: OL
OL WHOLLY ALTERED TO RED SMECTITE BUT ONE PART
WITH OLIVINE REMNANTS IS YELLOW SMECTITE;
CARBONATE
ARAGONITE
(IN OILS) IRREGULAR HOLE FILLING IS
ARAGONITE, RADIAL AGGREGATES (ROUND
VESICLE) MAY INCLUDE BOTH CALCITE
AND ARAGONITE OR IT MAY BE MAGNESIAN
CALCITE - "POOR DATA", GRANULAR VEIN
IN VERTICAL JOINT IS ARAGONITE,REMOUNT
OF NEW SAMPLE FROM RADIAL AGGREGATES
SHOWS VAGUE UNIAXIAL FIGURES -
APPARENTLY CALCITE IN COMPOSITE XTLS
TOO FINE TO SEPARATE COMPLETELY-EVEN
GOOD "CLEAVAGE FLAKES" GIVE WAVY EXT.;
Leg : 34 Top/Bottom Interval(mm): 470/ 510 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 148.01
Core: 7 Top of Core Depth (m) : 147.50
Sect: 1 Top of Section Depth(m): 147.97
LITHOLOGY: BASALT;
Piece No. : PCE 5 (47-51);
Texture : UNORIENTED FRAGMENT, COARSE-GRAINED TO VERY COARSE
GRAINED PORPHYRITIC BASALT;
Structure : ONE IRREGULAR JOINT LIGHTLY COATED WITH YELLOW
SMECTITE;
Alteration : OLIVINE WHOLLY ALTERED TO RED OR YELLOW OR
UNCOMMONLY GREENISH YELLOW SMECTITE, ROCK IS
YELLOWISH TO BROWNISH WHERE SOMEWHAT ALTERED DUE
TO YELLOW OR RED SMECTITE AFTER MESOSTASIS;
Comments : DARK GRAY;
Phenocrysts: PLAGIOCLASE
Size(mm): 2.8 X 0.8
OLIVINE
1.0 PERCENT PHENOS, OLIVINE PERCENTAGE IS GREATER
THAN PLAG, NONGLOMEROPHYRIC GENERALLY, PLAG UP TO
2.8 X 0.8 MM, OLIVINE WHOLLY ALTERED TO RED OR
YELLOW OR UNCOMMONLY GREENISH YELLOW SMECTITE;
Replacement: SMECTITE
Minerals Replaced: OL
OL ALTERED TO RED OR YELLOW OR UNCOMMONLY GREENISH
YELLOW SMECTITE;
Leg : 34 Top/Bottom Interval(mm): 540/ 620 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 148.12
Core: 7 Top of Core Depth (m) : 147.50
Sect: 1 Top of Section Depth(m): 148.04
LITHOLOGY: BASALT;
Piece No. : PCE 6 (54-62);
Texture : ORIENTED FRAGMENT, MEDIUM OR VERY COARSE GRAINED,
SLIGHTLY PORPHYRITIC BASALT, HAS DISTINCTLY
GRANULAR TEXTURE WHICH IS QUITE UNUSUAL;
Structure : ONE SIDE IS AN 80 DEGREE DIPPING JOINT WITH BLUE TO
YELLOW TO DEEP RED-BROWN SMECTITE COAT DEPENDING ON
DEGREE OF OXIDATION, REMNANTS OF CARBONATE VEIN ON
SURFACE, VERY STRIKING ARE ELONGATE IRREGULAR VUGGY
HOLES MOSTLY ORIENTED VERTICALLY AND ALIGNED IN
ZONES PARALLEL TO THE STEEP JOINT, OTHER THIN VEINS
ARE FLAT TO STEEP AND INCLUDE CARBONATE + POSSIBLY
OXIDIZED SMECTITE;
Alteration : ALL OLIVINE ALTERED;
Comments : DARK BROWN GRAY;
Vesicles :
Location: Filling: CARB, SMECTITE
Location: Filling: CALCITE, ARAGONIT
VERY STRIKING ARE ELONGATE IRREGULAR VUGGY HOLES
MOSTLY ORIENTED VERTICALLY AND ALIGNED IN ZONES
PARALLEL TO THE STEEP JOINT + MOST ARE FILLED BY
ONE OF THE FOLLOWING (1) CLEAR GRANULAR CARBONATE
- VUGGY WHERE FILLING IS INCOMPLETE BUT COMPLETE
IN SMALLER HOLES AND SOMETIMES DISTINCTLY RADIAL
(PROBABLY ARAGONITE) (2) SMECTITE OF GREEN OR
YELLOW OR BROWN WHERE FILLING IS INCOMPLETE
(3) CONICAL STRIATED (DOG TOOTH) CARBONATE
POSSIBLY CALCITE FOUND IN LARGEST HOLES
(4) COMBINATION OF THE ABOVE THREE - COMBINATION
NOT COMMON GENERALLY FILLED WITH SMECTITE;
Phenocrysts: PLAGIOCLASE
Size(mm): 3.5 X 2.0
OLIVINE
LESS THAN 0.5 PERCENT PHENOS, PLAG PERCENTAGE
GREATER THAN OL, PLAG UP TO 3.5 X 2.0 MM, ALL
OLIVINE ALTERED;
Replacement: SMECTITE
ARAGONITE
CALCITE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 650/ 740 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 148.24
Core: 7 Top of Core Depth (m) : 147.50
Sect: 1 Top of Section Depth(m): 148.15
LITHOLOGY: BASALT;
Piece No. : PCE 7 (65-74);
Texture : ORIENTED, COARSE GRAINED GRANULAR BASALT;
Structure : VEINS AND VUGS AS IN PIECE 6, NON-PENETRATIVE
IRREGULAR CRACKS MAY OR MAY NOT HAVE HAIRLINE VEIN
WITH GENERALLY CARBONATE, TOP SURFACE IS DARK BROWN
RUSTY JOINT WITH REMNANTS OF CALCITE VEIN;
Comments : DARK BROWNISH GRAY;
Vesicles :
Location: Filling: ARAGONIT, CALCITE
VEINS AND VUGS AS IN PIECE 6 WITH ONE VERY
PROMINENT VERTICAL VUG OF CONICAL CALCITE 3.5 X 2
CM ACROSS, AS IN PCE 6 ARAGONITE FILLED VUGS ARE
MUCH SMALLER AND MORE GENERALLY FILLED;
Phenocrysts: PLAGIOCLASE
Size(mm): 3.5 X 2.0
OLIVINE
LESS THAN 0.5 PERCENT PHENOS, ALL PLAG RARELY UP
TO 3.5 X 2 MM, ALMOST APHYRIC, OLIVINE (VERY
LITTLE) HAS GONE TO YELLOW SMECTITE;
Replacement: SMECTITE
ARAGONITE
CALCITE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 760/ 800 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 148.30
Core: 7 Top of Core Depth (m) : 147.50
Sect: 1 Top of Section Depth(m): 148.26
LITHOLOGY: BASALT;
Piece No. : PCE 8 (76-80);
Texture : UNORIENTED PIECE, COARSE GRAINED GRANULAR BASALT
ALMOST APHYRIC;
Structure : ONE JOINT COATED WITH BROWN OXIDIZED WAXY SMECTITE
AND ANOTHER WITH GRANULAR ARAGONITE;
Alteration : OL GONE TO RED SMECTITE;
Comments : DARK BROWN-GRAY;
Vesicles :
Location: Filling: ARAGONITE
HOLES FILLED WITH COLORLESS ACICULAR ARAGONITE;
Phenocrysts: PLAGIOCLASE
Size(mm): 2.5 X 2.0
OLIVINE
ALMOST APHYRIC, RARE PLAG UP TO 2.5 X 2.0 MM,
TINY OLIVINE GONE TO RED SMECTITE;
Replacement: SMECTITE
Minerals Replaced: OL
OL GONE TO RED SMECTITE;
ARAGONITE
Leg : 34 Top/Bottom Interval(mm): 820/ 860 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 148.36
Core: 7 Top of Core Depth (m) : 147.50
Sect: 1 Top of Section Depth(m): 148.32
LITHOLOGY: BASALT;
Piece No. : PCE 9 (82-86);
Texture : UNORIENTED FRAGMENT, COARSE GRAINED GRANULAR BASALT,
CARBONATE IN VERY FINE GRAINED SUBRADIAL AGGREGATES;
Alteration : OLIVINE ALTERED TO GREEN-YELLOW-RED MIXED SMECTITE
OR WHITE SMECTITE + THE WHITE MAY BE MIXED WITH
CARBONATE (CALCITE MORE ABUNDANT THAN ARAGONIT,
VERY FINE GRAINED SUBRADIAL AGGREGATES) + REMNANT
OF OLIVINE MAY BE FOUND IN BOTH TYPES;
Comments : DARK BROWN GRAY;
Phenocrysts: PLAGIOCLASE
Size(mm): 4.0 X 1.0
OLIVINE
0.5 PERCENT PHENOS WITH OLIVINE MORE ABUNDANT
THAN PLAG, PLAG UP TO 4.0 X 1.0 MM, OL ALTERED
TO GREEN-YELLOW-RED MIXED SMECTITE OR WHITE
SMECTITE + THE WHITE MAY BE MIXED WITH CARBONATE
(CALCITE MORE ABUNDANT THAN ARAGONIT, VERY FINE
GRAINED SUBRADIAL AGGREGATES) + REMNANTS OF OL
MAY BE FOUND IN BOTH TYPES;
Replacement: SMECTITE
CALCITE
ARAGONITE
Leg : 34 Top/Bottom Interval(mm): 880/ 930 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 148.43
Core: 7 Top of Core Depth (m) : 147.50
Sect: 1 Top of Section Depth(m): 148.38
LITHOLOGY: BASALT;
Piece No. : PCE 10 (88-93);
Texture : UNORIENTED FRAGMENT;
Structure : SEVERAL COATED JOINTS - COATS ARE BLUE FILM AND
GRANULAR ARAGONITE (NOT CONFIRMED BUT LIKE THAT IN
PCE 8) + BLUE FILM AND MINOR BROWN WAXY SMECTITE
AND REMNANTS OF CARBONATE VEIN + DARK BROWN WAXY
SMECTITE + YELLOW SMECTITE (ON THIS FACE ARE SOME
DARK SUBRADIAL PRISMS AND ON CLOSER INSPECTION THEY
SEEM TO BE MOLDS WHICH MAY ONCE HAVE HELD RADIAL
ARAGONITE CRYSTALS AS IN SIMILAR OCCURRENCE IN
319A-2 AND 319-3 AND PCE 6 HIGHER IN THIS HOLE);
Comments : SEVERAL COATED JOINTS - FOR DESCRIPTION OF COATS
SEE CODE (S) STRUCTURE;
Phenocrysts: PLAGIOCLASE
Size(mm): 4.0 X 1.0
OLIVINE
LIKE PCE 9 WITH EVEN FEWER PHENOS BUT SAME
RELATIVE PROPORTIONS AND TYPES, PLAG UP TO
4.0 X 1.0 MM;
Replacement: SMECTITE
ARAGONITE
CARBONATE
Leg : 34 Top/Bottom Interval(mm): 950/1100 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 148.60
Core: 7 Top of Core Depth (m) : 147.50
Sect: 1 Top of Section Depth(m): 148.45
LITHOLOGY: BASALT;
Piece No. : PCES 11 (95-100), 12 (97-100), 13 (100-105),
14 (100-103), 15 (105-110);
Texture : PCE 11 IS VERY COARSE GRAINED PORPHYRITIC BASALT,
PCES 13-14 ARE BOTH VERY COARSE GRAINED BASALT;
Structure : PCES 11 AND 12 ARE SEPARATED BY AN IRREGULAR DIPPING
VEIN COATED BY YELLOW AND BROWN SMECTITE AND
REMNANTS OF A CARBONATE VEIN, THE BOTTOM OF PCE 11
AND TOP OF PCE 13 ARE AN IRREGULAR ROUGHLY FLAT
SURFACE IN PART BY A BLUE FILM, PCES 13 AND 14 ARE
SEPARATED BY AN EXTENSION OF THE JOINT BETWEEN PCES
11 AND 12 + IS COVERED BY YELLOW AND BROWN SMECTITE
AND A CARBONATE VEIN, ON PCES 13-15 MOST CRACKS DIP
ABOUT 10 DEGREES, ON PCE 15 ONLY THE BOTTOM 60
DEGREE DIPPING VEIN SHOWS RUSTY ALTERATION - IT IS A
COMPLEX VEIN COMPOSED OF OLIVINE FROM PCE 13;
Alteration : BROWNISH GRAY AND ALTERED AT TOP TO GRAYER AND
FRESHER BELOW (PCE 15), ON PCE 11 OLIVINE GONE TO
BLUE-GREEN PSEUDOMORPHS WHERE THE ROCK IS ALTERED
- OLIVINE PSEUDOMORPHS ARE YELLOW TO BROWN + THE
ROCK IS DARK BROWNISH GRAY, PCES 11-12 HAVE
PSEUDOMORPHS AFTER OLIVINE, PART OF PCE 13 IS
FRESH GRAY AND CONTAINS SOME FRESH OLIVINE, PCES
13-15 VERY FRESH DARK GRAY BASALT WITH FRESH
OLIVINE TO PARTLY ALTERED OLIVINE WITH GREEN
SMECTITE, PCES 13-15 WITH MOST CRACKS DIPPING
ABOUT 10 DEGREES + ARE UNALTERED OR COATED WITH
A THIN FILM OF DARK GREEN SMECTITE ONLY LOCALLY
OXIDIZED TO A BROWN COLOR, ON PCE 15 ONLY THE
BOTTOM DIPPING 60 DEGREE VEIN SHOWS RUSTY
ALTERATION;
Comments : BROWNISH GRAY + ALTERED AT TOP TO GRAYER AND
FRESHER BELOW (PCE 15), PCE 11 IS DARK GRAY;
Phenocrysts: PLAGIOCLASE
Size(mm): 2.5 X 1.5
OLIVINE
PCE 11 HAS 0.5 PERCENT PHENOS + PLAG IS MORE
ABUNDANT THAN OLIVINE + PLAG UP TO 2.5 X 1.5 MM +
OLIVINE GONE TO BLUE-GREEN PSEUDOMORPHS AND WHERE
ROCK IS ALTERED OLIVINE PSEUDOMORPHS ARE YELLOW
TO BROWN AND ROCK IS DARK BROWNISH GRAY, PCES 11-
12 HAVE SPARSE PLAG PHENOS + PSEUDOMORPHS AFTER
OLIVINE, PCES 13-15 HAS FRESH OLIVINE TO PARTLY
ALTERED OLIVINE WITH GREEN SMECTITE;
Replacement: SMECTITE
Leg : 34 Top/Bottom Interval(mm): 1140/1220 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 148.72
Core: 7 Top of Core Depth (m) : 147.50
Sect: 1 Top of Section Depth(m): 148.64
LITHOLOGY: BASALT;
Piece No. : PCE 16 (114-122);
Texture : ORIENTED FRAGMENT, VERY COARSE GRAINED BASALT;
Structure : NO VEINS OR CRACKS EXCEPT BOTTOM WHERE THERE IS AN
20 DEGREE DIPPING RUSTY VEIN COMPOSED OF MASSIVE
DEEP RED-BROWN DULL SMECTITE IN WHICH RADIAL
ACICULAR ARAGONITE IS INTERLAYERED IN WHICH THERE
ARE UNOXIDIZED REMNANTS OF BLUE-GREEN SMECTITE;
Alteration : FRESH, OLIVINE FRESH TO PARTLY ALTERED TO GREEN
SMECTITE;
Comments : DARK GRAY;
Phenocrysts: OLIVINE
PLAGIOCLASE
Size(mm): 6.0 X 4.0
2 PERCENT PHENOS, PLAG MORE ABUNDANT THAN OL,
PLAG UP TO 6.0 X 4.0 MM, OLIVINE FRESH TO PARTLY
ALTERED TO GREEN SMECTITE;
Replacement: SMECTITE
Minerals Replaced: OL
OLIVINE FRESH TO PARTLY ALTERED TO GREEN SMECTITE;
ARAGONITE
Leg : 34 Top/Bottom Interval(mm): 1240/1290 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 148.79
Core: 7 Top of Core Depth (m) : 147.50
Sect: 1 Top of Section Depth(m): 148.74
LITHOLOGY: BASALT;
Piece No. : PCE 17 (124-129);
Texture : ORIENTED FRAGMENT, VERY COARSE GRAINED OR COARSE
GRAINED FRESH BASALT;
Structure : SEVERAL TIGHT CRACKS + VEINS DIPPING 10 TO 15
DEGREES + ONE DIPPING 70 DEGREES - UNALTERED EXCEPT
NEAR TOP AND BOTTOM WHERE THEY ARE SLIGHTLY RUSTY
+ REMNANTS OF RED-BROWN SMECTITE VEIN ON LOWER
SURFACE;
Alteration : VERY COARSE GRAINED OR COARSE GRAINED FRESH
BASALT, OLIVINE PARTLY TO WHOLLY ALTERED, SEVERAL
TIGHT CRACKS + VEINS UNALTERED EXCEPT NEAR TOP
AND BOTTOM WHERE THEY ARE SLIGHTLY RUSTY;
Comments : DARK GRAY;
Phenocrysts: OLIVINE
PLAGIOCLASE
Size(mm): 4.0 X 1.0
1.0 TO 1.5 PERCENT PHENOS, PLAG AND OL IN EQUAL
AMOUNTS, PLAG UP TO 4.0 X 1.0 MM GENERALLY LESS
THAN 2 X 1 MM, OLIVINE PARTLY TO WHOLLY ALTERED;
Replacement: SMECTITE
REMNANTS OF SMECTITE VEIN ON LOWER SURFACE;
Leg : 34 Top/Bottom Interval(mm): 1310/1350 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 148.85
Core: 7 Top of Core Depth (m) : 147.50
Sect: 1 Top of Section Depth(m): 148.81
LITHOLOGY: BASALT;
Piece No. : PCE 18 (131-135);
Texture : UNORIENTED FRAGMENT, MEDIUM TO COARSE GRAINED
PORPHYRITIC BASALT, FINER GRAINED THAN PCE 12;
Structure : TIGHT CRACKS AND VERY THIN RED-BROWN SMECTITE VEINS
OF SEVERAL ORIENTATIONS + NON-PENETRATIVE;
Alteration : OLIVINE ALTERED TO YELLOWISH WHITE SMECTITE OR TO
RIM OF YELLOWISH WHITE SMECTITE (PLUS CARBONATE)
AND A LARGE CORE OF EARTHY FE OXIDE;
Comments : DARK GRAY, LITTLE OF THE ROCK HAS A BROWNISH HUE -
MOST IS GRAY;
Phenocrysts: OLIVINE
PLAGIOCLASE
Size(mm): 4.5 X 2.0
0.5 TO 1.0 PERCENT PHENOS, PLAG MORE ABUNDANT THAN
OL, MAX PLAG SIZE IS 4.5 X 2.0 MM GENERALLY MUCH
SMALLER, OLIVINE ALTERED TO YELLOWISH WHITE
SMECTITE OR TO RIM OF YELLOWISH WHITE SMECTITE
(PLUS CARBONATE) AND A LARGE CORE OF EARTHY RED
FE OXIDE;
Replacement: SMECTITE
Minerals Replaced: OL
OL ALTERED TO SMECTITE;
Leg : 34 Top/Bottom Interval(mm): 1380/1410 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 148.91
Core: 7 Top of Core Depth (m) : 147.50
Sect: 1 Top of Section Depth(m): 148.88
LITHOLOGY: BASALT;
Piece No. : PCE 19 (138-141);
Texture : VERY COARSE GRAINED PORPHYRITIC BASALT;
Structure : ONE VERTICAL JOINT COATED IN PART WITH YELLOW TO
BROWN SMECTITE AND IN PART WITH A LIGHT BLUE FILM -
ONE SURFACE IS A 35 DEGREE DIPPING JOINT ON WHICH
THERE ARE REMNANTS OF A LIGHT BLUE FILM + A TINY
REMNANT OF A VEIN OF GRANULAR QUESTIONABLE CARB;
Alteration : FRESH, OLIVINE IS ALTERED TO EARTHY FE OXIDE (RED)
OR YELLOW TO LIGHT BROWN WAXY SMECTITE - RARE
FRESH REMNANTS, THE OLIVINE ALTERED TO RED EARTHY
FE OXIDE IS EXPOSED ON OR NEAR THESE JOINTS + THE
HOST ROCK NEAR THEM HAS A FAINT BROWNISH TINGE;
Comments : DARK GREY, SEE CODE (S) STRUCTURE FOR INFORMATION
ON COATS AND FILMS;
Phenocrysts: PLAGIOCLASE
Size(mm): 5 X 3.5
OLIVINE
1.0 PERCENT PHENOS, PLAG AND OL EQUALLY ABUNDANT,
OLIVINE ALTERED TO EARTHY FE OXIDE OR YELLOW
TO LIGHT BROWN WAXY SMECTITE - RARE FRESH REMNANTS
THE OLIVINE ALTERED TO RED EARTHY FE OXIDE IS
EXPOSED ON OR NEAR THE JOINTS;
Replacement: SMECTITE
Minerals Replaced: OL
OL IS ALTERED TO EARTHY FE OXIDE OR YELLOW TO
LIGHT BROWN WAXY SMECTITE;
Leg : 34 Top/Bottom Interval(mm): 1430/1480 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 148.98
Core: 7 Top of Core Depth (m) : 147.50
Sect: 1 Top of Section Depth(m): 148.93
LITHOLOGY: BASALT;
Piece No. : PCE 20 (143-148);
Texture : UNORIENTED, VERY FINE GRAINED PORPHYRITIC BASALT,
GRANULAR - COLORLESS QUESTIONABLE PHILLIPSITE FORM
A PARTIAL DRUSY COAT ON THE GREENISH YELLOW SMECT;
Structure : LIGHT NON-PENETRATIVE CRACKS ELSEWHERE IN THE ROCK
ARE UNALTERED OR LIGHTLY COATED BY BLUE OR GREENISH
YELLOW FILMS;
Alteration : OLIVINE RARELY FRESH - MAINLY ALTERED TO YELLOW
(RARELY LIGHT BROWN) WAXY SMECTITE OR TO EARTHY
RED-BROWN FE OXIDE, THE EARTHY RED-BROWN
ALTERATION OCCURS NEAR TWO SURFACES - ONE OF THEM
LIGHT BROWNISH AND THE OTHER (A COMPOSITE OF
THREE JOINT SURFACES) COVERED BY GREENISH YELLOW
SMECTITE LOCALLY OXIDIZED TO ORANGE BROWN - THE
ROCK NEXT TO THEM HAS BROWNISH HUE, LIGHT
PENETRATIVE CRACKS ELSEWHERE IN THE ROCK ARE
UNALTERED OR LIGHTLY COATED BY BLUE OR GREENISH
YELLOW FILMS;
Comments : DARK GREY, FILMS AND COATS PRESENT;
Phenocrysts: PLAGIOCLASE
Size(mm): 1.5 X 1.0
OLIVINE
1.0 PERCENT PHENOS, OL MORE ABUNDANT THAN PLAG,
MAXIMUM PLAG SIZE IS 1.5 X 1 MM, OLIVINE RARELY
FRESH - MAINLY ALTERED TO YELLOW (RARELY LIGHT
BROWN) WAXY SMECTITE OR TO EARTHY RED BROWN FE
OXIDE, PHENOS OFTEN GLOMEROPHYRIC;
Replacement: SMECTITE
Minerals Replaced: OL
OL MAINLY ALTERED TO YELLOW (RARELY LIGHT BROWN)
WAXY SMECTITE OR TO EARTHY RED BROWN FE OXIDE;
Leg : 34 Top/Bottom Interval(mm): 0/ 0 Analyst: Bass, M.
Hole: 319A Sample Midpoint (m) : 157.00
Core: X 1 Top of Core Depth (m) : 157.00
Sect: Top of Section Depth(m): 157.00
LITHOLOGY: BASALT;
Comments : THE LOSS OF HOLE 319-A SEEMS TO CORRELATE WITH THE
INFLUX OF FINE DEBRIS (2.5 CM AND SMALLER DOWN TO
THE COARSE SAND RANGE) THAT IS COMMONLY OR ALWAYS
ANGULAR AND UNABRADED, THE MOST COMMON CONSTITUENTS
ARE APHANITIC TO FINE OR MEDIUM GRAINED BASALT
SOMETIMES MICROPHYRIC, IN ORDER OF DECREASING
ABUNDANCE THERE ARE ALSO GLASS (+ ORANGE + BROWN AND
PINK PALAGONITE) COARSE GRAINED BASALT AND VERY
FINE GRAINED DIABASE (OR VERY COARSE GRAINED BASALT
ONLY ONE FRAGMENT SEEN), THE HOLOCRYSTALLINE ROCK
IS RARELY COATED BY VEINS WHEREAS THE PALAGONITE
IS TYPICALLY VEINED BY COLORLESS GRANULAR
PHILLIPSITE VEINS, TYPICALLY THE PALAGONITE (AND
RARELY THE HOLOCRYSTALLINE ROCK) IS ALSO COATED BY
STRIKING DRUSY COATS OF COLORLESS PHILLIPSITE
WHICH INDICATE DERIVATION FROM A POROUS ORIGIN
PROBABLY FRACTURED PILLOWS AND INTERPILLOW
HYALOCLASTITE RUBBLE, THE PALOGONITE IS ORANGE TO
YELLOW COMMONLY LESS THAN 1 MM THICK BUT ALSO OCCURS
IN LARGE GLASS-POOR OR GLASS-FREE MASSES SEVERAL MM
THICK, THE QUESTIONABLE PHILLIPSITE DRUSES NEVER
CONTACT FRESH GLASS + ARE ASSOCIATED WITH
PALAGONITE, ONE HOLOCRYSTALLINE FRAGMENT HAS A
POLISHED FAINTLY SLICKENSIDED GOUGE COATED SURFACE
+ RARE FRAGMENTS HAVE YELLOW SMECTITE OR CARBONATE
JOINT COATINGS (EXAMPLE-VEINS), BEYOND THESE THE
HOLOCRYSTALLING ROCKS APPEAR UNALTERED, TO JUDGE
FROM THE HOMOGENEITY OF THE SUITE AND THE UNIFORM
INDICATION OF DERIVATION FROM SMALL RAPIDLY COOLED
UNITS (PROBABLY PILLOWS) THE MATERIAL WOULD SEEM TO
REPRESENT A SINGLE LARGE SLUMP OR MASS MOVEMENT INTO
Comments : BASEMENT TOP, QUESTIONABLE PHILLIPSITE - COATED
PALAGONITE HAS EARLIER BEEN NOTED IN ALL CORE
CATCHER SAMPLES (ACTUALLY IN THE FINE DEBRIS CAUGHT
IN A BUCKET ALONG WITH WATER FROM THE LINER) AS
RECORDED IN THE VISUAL DESCRIPTIONS OF 319A-1-CC
+ 319A-2-CC + 319A-3-CC + 319A-5-CC, THE GLASS WAS
ALWAYS ACCOMPANIED BY FINE GRAINED CHILLED BASALT
AND IT WAS NOT CLEAR WHETHER THESE FRAGMENTS WERE
FROM THE IMMEDIATELY PRECEDING CORED INTERVAL MUCH
HIGHER IN HOLE OR BOTH, IN VIEW OF SUBSEQUENT EVENTS
WE MAY SPECULATE THAT ALL OR MOST OF THIS EARLY
DEBRIS WAS FROM A SINGLE HORIZON AT WHICH THE HOLE
HIGH IN THE BASEMENT WAS PROGRESSIVELY MOLDING
THROUGHOUT THE CORING OPERATIONS, WITH THE FAILURE
OF THE POWER SUB THE TRICKLING DEBRIS WAS ABLE TO
ACCUMULATE AND STICK THE BIT WHEREAS PREVIOUSLY
THE DEBRIS HAD BEEN GROUND UP TOO FAST TO ACCUMULATE
TO A DEGREE ABLE TO CAUSE STICKING, ALTERNATIVELY
OR IN ADDITION THE HOLE AT THE WEAK HORIZON HAD
EXPANDED TO THE SIZE THAT A SINGLE LARGE MASS
MOVEMENT INTRODUCED MORE DEBRIS THAN THE BOTTOM HOLE
ASSEMBLY COULD COPE WITH LEADING TO LOSS OF THE
HOLE, IF SIMILAR INDICATIONS APPEAR IN FUTURE HOLES
IT MAY BE ADVISABLE TO CORE AS FAST AS POSSIBLE AND
EVEN KEEP THE BIT TURNING SLOWLY DURING LOWERING AND
RAISING OF THE CORE BARREL (IF IT IS POSSIBLE),
THEREBY SOME PART OF THE SECTION MAY BE LOST BUT THE
HOLE MAY BE KEPT OPEN, CIRCULATION BETWEEN CORES TO
REMOVE THE CUTTINGS MAY PROLONG THE LIFE OF THE HOLE
AS WELL, BARRING SOME PROCEDURES OF THIS SORT DEEP
BASEMENT PENETRATION WOULD BE BEST PRESERVED FOR OLD
TECTONICALLY STABLE BASEMENT SITES WHERE OLD PORES
ARE CEMMENTED AND YOUNG OPEN FRACTURES ARE MINIMAL;
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