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Core Data from the Deep Sea Drilling Project


Leg : 76    Top/Bottom Interval(mm):  100/ 200  Analyst: Cotillon, P.
Hole: 534A  Sample Midpoint (m)    :  1635.39
Core: 127   Top of Core Depth (m)  :  1630.50
Sect: CC    Top of Section Depth(m):  1635.29

LITHOLOGY: APHYRIC BASALT;

  Texture    : APHYRIC;

  Comments   : GREYISH BLACK(N2), THIN SECTION HAS VARIOLITIC
               FELDSPAR LATHS;

  Vesicles   : FILLED VESICLES;

  Groundmass : FELDSPAR
               WHITE FELDSPAR LATHS;


Leg : 76    Top/Bottom Interval(mm):    0/1400  Analyst: Tyson, R.
Hole: 534A  Sample Midpoint (m)    :  1640.90
Core: 128   Top of Core Depth (m)  :  1639.50
Sect:  1    Top of Section Depth(m):  1639.50

LITHOLOGY: APHYRIC BASALT;

  Piece No.  : PCES 1 (0-8), 2A (10-31), 2B (31-44), 2C (45-53),
               3 (55-63), 4 (65-71), 7A (82-91), 7B (84-91),
               8A (93-100), 8B (101-110), 9 (112-118),
               10 (121-130), 11 (133-140);

  Texture    : APHYRIC, GLASSY BASALT(75CM AND 131CM) IS FINE-
               GRAINED(?) AND OCCURS AS THIN(UP TO 2CM) TO THICK
               LAYERS APPARENTLY ON MARGINS OF FLOW(?) UNITS, TOP
               1CM OF PCE(2A) IS FINER-GRAINED-POSSIBLE CHILLED
               MARGIN;

  Structure  : COMMON CALCITE VEINS UP TO 2MM ACROSS, COMMON
               GREENISH BLACK(5GY2/1) TO DARK GREENISH GREY(5G4/1)
               ALTERATION PRODUCTS ALONG FRACTURES AND WITH CALCITE
               IN VEINS AND SOMETIMES MODERATE YELLOWISH-BROWN
               (10YR5/4) THIN PYRITE FILMS COMMON ALONG SOME
               FRACTURES;

  Alteration : MOD;

  Comments   : BASALT IS DARK GREY(N3) AND GLASSY BASALT IS GREYISH
               BLACK(N2) TO GREENISH BLACK(5GY2/1) DEPENDING ON
               THE EXTENT OF ALTERATION, THERE ARE THREE FLOW UNITS
               1(0-75), 2(75-131), 3(131-END);

  Vesicles   : Size(mm):        1   Percent:
               BASALT HAS BLACK SPECKLES-CIRCULAR AMYGDULES
               POSSIBLY FILLED WITH CLAYS AND OPAQUES AND ALSO
               MEDIUM DARK GREY(N4) AMYGDULES BOTH ABOUT 1MM IN
               DIAMETER, SPARSELY TO MODERATELY VESICULAR
               (GENERALLY INFILLED), PCES(2A-C) ARE MORE
               AMYGDALOIDAL WITH PCE(2A) LESS VESICULAR;

  Replacement: PYRITE

               CALCITE

               CLAYS
               POSSIBLY CLAYS AND OPAQUES FILL CIRCULAR
               AMYGDULES;


Leg : 76    Top/Bottom Interval(mm):  740/ 810  Analyst: Tyson, R.
Hole: 534A  Sample Midpoint (m)    :  1640.31
Core: 128   Top of Core Depth (m)  :  1639.50
Sect:  1    Top of Section Depth(m):  1640.24

LITHOLOGY: CALCITIC CLAYSTONE;

  Piece No.  : PCES 5 (74-77), 6 (79-81);

  Comments   : DARK REDDISH BROWN(10R3/4), CONTAINS IRREGULAR
               FRAGMENTS(?) OF GLASSY BASALT <2CM ACROSS(ESP. PCE
               (5)), WHERE THERE IS A CALCITE MASS(1X2CM) OF
               GREYISH-BLUE-GREEN COLOUR(5BA3/2);


Leg : 76    Top/Bottom Interval(mm):    0/1470  Analyst: Tyson, R.
Hole: 534A  Sample Midpoint (m)    :  1642.47
Core: 128   Top of Core Depth (m)  :  1639.50
Sect:  2    Top of Section Depth(m):  1641.00

LITHOLOGY: APHYRIC BASALT;
           IDENTICAL TO CORE 128-1;

  Piece No.  : PCES 1A (2-15), 1B (12-21), 2 (24-25), 3 (27-29),
               4 (31-34), 5 (35-43), 6 (45-51), 7 (52-57),
               8A (60-65), 8B (65-67), 9 (72-78), 10 (80-96),
               11 (98-108), 12 (110-116), 13 (119-125),
               14 (127-134), 15 (136-147);

  Texture    : TOP OF PCE(14) HAS 5MM GLASSY BASALT UNDERLAIN BY
               5MM OF FINER-GRAINED NON-VESICULAR BASALT, TOP OF
               PCE(9) HAS 1CM OF GLASSY BASALT UNDERLAIN BY 5MM OF
               FINER-GRAINED NON-VESICULAR BASALT, APHYRIC;

  Structure  : FRACTURES;

  Alteration : MOD;

  Comments   : 3 FLOW UNITS: 3 IS CONTINUED FROM 128-1 PCES(1-8),
               4 PCES(9-14), 5 PCES(14-15);

  Vesicles   : BLACK INFILLED VESICLES ARE MORE ABUNDANT IN THE
               VICINITY OF FRACTURES, PCES(9,14) ARE UNDERLAIN BY
               NON-VESICULAR BASALT;


Leg : 76    Top/Bottom Interval(mm):    0/1040  Analyst: Pisciotto, K.
Hole: 534A  Sample Midpoint (m)    :  1643.54
Core: 128   Top of Core Depth (m)  :  1639.50
Sect:  3    Top of Section Depth(m):  1642.50

LITHOLOGY: APHYRIC BASALT;

  Piece No.  : PCES 1A (1-13), 1B (7-10), 1C (11-21), 2 (22-25),
               3 (26-32), 4 (36-45), 5A (46-53), 5B (52-61),
               6 (64-80), 7 (83-92), 8 (94-96), 9 (99-104);

  Texture    : APHYRIC, NO GLASSY MARGINS OBSERVED, PCES(1C, PARTS
               OF 6,7,8) APPEAR FINER-GRAINED THAN OTHERS;

  Structure  : MODERATELY FRACTURED WITH SOME CALCITE-(AND SOME
               GREEN SMECTITE(?) MIXED IN) VEINS;

  Alteration : MOD;

  Comments   : PCE(9) IS A GREENISH-GREY MIXTURE OF CALCITE AND
               SMECTITE(ALTERED GLASS ?) AND YELLOWISH PALAG(?),
               DARK GREY(N3) VERY SIMILAR TO BASALT IN SECT(1,2),
               ONE FLOW UNIT: 5 PCES(1A-9);

  Vesicles   : SCATTERED VESICLES FILLED WITH DARK GREEN SMEC(?),
               VESICLES SPARSE NEAR BASE OF PCE(1C) AND PARTS OF
               PCES(6,7,8);

  Replacement: SMECTITE

               CALCITE

               PALAGONITE


Leg : 76    Top/Bottom Interval(mm): 1060/1210  Analyst: Pisciotto, K.
Hole: 534A  Sample Midpoint (m)    :  1643.71
Core: 128   Top of Core Depth (m)  :  1639.50
Sect:  3    Top of Section Depth(m):  1643.56

LITHOLOGY: CLAYEY LIMESTONE;

  Piece No.  : PCES 10 (106-110), 11 (113-121);

  Comments   : ONE-HALF OF PCE(11) IS LIMESTONE, THEN LARGE CALCITE
               VEIN, THEN APHYRIC BASALT;


Leg : 76    Top/Bottom Interval(mm): 1130/1210  Analyst: Pisciotto, K.
Hole: 534A  Sample Midpoint (m)    :  1643.71
Core: 128   Top of Core Depth (m)  :  1639.50
Sect:  3    Top of Section Depth(m):  1643.63

LITHOLOGY: APHYRIC BASALT;

  Piece No.  : PCE 11 (113-121);

  Texture    : BASALT BELOW LARGE CALCITE VEIN(CA. 117CM) IS
               APHYRIC;

  Structure  : SMALL CALCITE-VEINED BASALT FRAGMENTS IN LIMESTONE
               JUST ABOVE LARGE HORIZONTAL CALCITE VEIN;

  Alteration : MOD;

  Comments   : BLACK, ONE FLOW UNIT: 6 PCES(11-?), TOP PART OF
               PCE(11) IS CLAYEY LIMESTONE WITH SEVERAL WHITE
               CALCITE VEINS;

  Replacement: CALCITE


Leg : 76    Top/Bottom Interval(mm):    0/1460  Analyst: Tyson, R.
Hole: 534A  Sample Midpoint (m)    :  1645.46
Core: 128   Top of Core Depth (m)  :  1639.50
Sect:  4    Top of Section Depth(m):  1644.00

LITHOLOGY: APHYRIC BASALT;
           VESICULAR;

  Piece No.  : PCES 1A (1-6), 1B (7-25), 1C (24-40), 1D (40-46),
               1E (46-61), 2A (64-82), 2B (82-96), 2C (97-105),
               2D (104-121), 2E (113-131), 3 (133-140),
               4 (143-146);

  Texture    : APHYRIC, GLASSY MARGINS ON BACK SIDES OF PCES(3,4),
               GRAIN SIZE APPEARS TO COARSEN FROM TOP OF PCE(1A) TO
               ABOUT 16CM THEN UNIFORM BELOW, PCES(1A, TOP OF 1B)
               APPEAR TO BE FINER-GRAINED THAN REST OF SECTION;

  Structure  : SCATTERED FRACTURES AND CALCITE-(SMEC ?) FILLED
               VEINS;

  Alteration : MOD;

  Comments   : DARK GREY(N3), FLOW UNIT 6 CONTINUED TO END OF SECT;

  Vesicles   : Size(mm):            Percent:  .5-1
               Location:            Filling: SMEC, CALCITE
               VESICULAR, MAYBE FILLED WITH DARK-GREEN SMEC(?) &
               WHITE CALCITE, VESICLES APPEAR TO OCCUR AROUND
               VEINS, PCE(2A) HAS ONE SIDE WITH CALCITE-FILLED
               VESICLES AND THE OTHER WITH SMEC-FILLED VESICLES;

  Replacement: SMECTITE

               CALCITE

               PYRITE
               SEVERAL SMALL PYRITE CRYSTALS IN PCE(1E);


Leg : 76    Top/Bottom Interval(mm):    0/1250  Analyst: Pisciotto, K.
Hole: 534A  Sample Midpoint (m)    :  1646.75
Core: 128   Top of Core Depth (m)  :  1639.50
Sect:  5    Top of Section Depth(m):  1645.50

LITHOLOGY: APHYRIC BASALT;
           VESICULAR;

  Piece No.  : PCES 1A (1-12), 1B (14-18), 2A (22-27), 2B (28-31),
               3 (34-40), 4 (41-49), 5 (62-65), 6 (68-71),
               7A (73-91), 7B (92-110), 8 (113-125);

  Texture    : APHYRIC, GLASSY MARGINS(ALTERED TO CLAY) IN PCES(2B,
               4) WITH TOP OF PCE(4) CHILLED;

  Structure  : CALCITE AND SMECTITE VEINS COMMON AS MARKED;

  Alteration : MOD;

  Comments   : DARK GREY(N3), GLASSY MARGINS MARK BOUNDARIES OF
               FLOW UNITS: 7(0-35), 8(35-70), 9(70-125), PCE(6)
               CONTAINS A PCE OF BASALT SURROUNDED ON ONE SIDE BY
               MIXED CALCITE AND YELLOWISH BROWN PALAGONITE(?),
               OUTER COATING OF QUARTZ ON ONE SIDE OF SAMPLE
               (CALCITE LAYER JUST BELOW THIS), SMALL PCE OF
               REDDISH LIMESTONE IN RUBBLE OF PCE(3);

  Vesicles   : VESICULAR, VESICLES FILLED WITH DARK GREEN SMEC ?;

  Replacement: SMECTITE

               CALCITE

               PALAGONITE


Leg : 76    Top/Bottom Interval(mm):    0/1360  Analyst: Pisciotto, K.
Hole: 534A  Sample Midpoint (m)    :  1649.86
Core: 129   Top of Core Depth (m)  :  1648.50
Sect:  1    Top of Section Depth(m):  1648.50

LITHOLOGY: APHYRIC BASALT;

  Piece No.  : PCES 1 (2-10), 2 (12-36), 3 (38-46), 4 (44-51),
               5 (53-59), 6 (62-66), 7A (67-74), 7B (75-85),
               8 (86-89), 9 (93-95), 10A (98-111), 10B (108-110),
               11 (113-130), 12 (132-136);

  Texture    : APHYRIC, PCES(3,7 ?) HAVE GLASSY MARGINS, ONE
               SURFACE HAS SPHERULITIC(BOTRYOIDAL) QTZ, PCE(1) IS
               APHANITIC;

  Structure  : CALCITE-SMECTITE(?) FILLED VEINS ARE COMMON,
               FRACTURES;

  Alteration : MOD
               PCE(1) IS HIGHLY ALTERED;

  Comments   : DARK GREY(N3), TWO FLOW UNITS: 10 PCES(1-2), 11
               PCES(3-12);

  Vesicles   :
               Location:            Filling: CALCITE, SMECTITE
               SCATTERED VESICLES FILLED WITH DARK GREEN SMEC(?)
               AND WHITE CALCITE, VESICLES ARE LARGER AND MORE
               NUMEROUS IN PCES(4-7B);

  Groundmass : QUARTZ
               ONE SURFACE OF PCE(1) HAS OUTER COATING OF
               SPHERULITIC(BOTRYOIDAL) QUARTZ OVERLYING GREEN
               CLAYS THEN A THIN DISCONTINUOUS WHITE CALCITE
               LAYER OVER ALTERED BASALT;

  Replacement: CALCITE
               FIBROUS CALCITE GROWS PERPENDICULAR TO FRACTURES
               IN SOME CASES;

               SMECTITE

               CLAY
               CLAYS ARE GREEN;


Leg : 76    Top/Bottom Interval(mm): 1370/1500  Analyst: Pisciotto, K.
Hole: 534A  Sample Midpoint (m)    :  1650.00
Core: 129   Top of Core Depth (m)  :  1648.50
Sect:  1    Top of Section Depth(m):  1649.87

LITHOLOGY: CLAYEY LIMESTONE AND APHYRIC BASALT;
           MASSIVE;

  Piece No.  : PCES 13 (127-143), 14 (146-148);

  Texture    : APHYRIC, SOME ALTERED GLASS(?) AND MAYBE SOME
               PALAGONATIZED FRAGMENTS AT CONTACT BETWEEN PCE 13 &
               12;

  Structure  : MASSIVE, NO OBVIOUS SEDIMENTARY STRUCTURES;

  Alteration : MOD;

  Comments   : REDDISH-BROWN, COULD BE SILICEOUS(?), PCE(13) SHOWS
               A SHARP CONTACT BETWEEN CLAYSTONE AND BASALT;


Leg : 76    Top/Bottom Interval(mm):    0/1360  Analyst: Kostecki, J.A.
Hole: 534A  Sample Midpoint (m)    :  1651.36
Core: 129   Top of Core Depth (m)  :  1648.50
Sect:  2    Top of Section Depth(m):  1650.00

LITHOLOGY: APHYRIC BASALT;
           VESICULAR;

  Piece No.  : PCES 1A (0-9), 1B (9-16), 1C (16-18), 1D (17-23),
               1E (23-27), 1F (27-43), 2A (44-46), 2B (46-57),
               3A (59-61), 3B (61-69), 3C (69-85), 4 (87-90),
               5A (94-95), 5B (94-103), 6 (105-124), 7 (125-128),
               8A (132-134), 8B (135-136);

  Texture    : APHYRIC, FINE-GRAINED, SECTION 2A SEEMS TO BE CAPPED
               BY GLASSY BASALT WITH AN ALTERED ZONE BELOW,
               HYALOCLASTITE 10-31CM;

  Structure  : PCE(1A) CONTAINS SEVERAL FRACTURES WHICH MAY HAVE
               BEEN INFILLED WITH RED METALLIFEROUS SEDIMENTS WITH
               QUARTZ VEINS IN THE BOTTOM HALF INTER-MINGLING WITH
               THE SEDIMENT IN THE MIDDLE, PCES(1B-1F) ARE
               BRECCIATED BASALT FRAGMENTS IN A MATRIX OF
               HYDROTHERMAL QUARTZ AND CALCITE AND GREENISH COLOR
               IS PROBABLY SMEC, PCE(2B) IS A FRACTURED BASALT;

  Alteration : MOD
               SECTIONS (2A,3C) HAVE ALTERED ZONES;

  Comments   : THREE FLOW UNITS: 12 (1A-1F), 13 (2A-3B),
               14 (3C-8B), PCES(4-END) ARE FRACTURED VESICULAR
               BASALT, SEDIMENTS ARE RED AND METALLIFEROUS AND ID
               IN PARTS UNCERTAIN;

  Vesicles   : Size(mm):     .1-1   Percent:
               VESICULAR BASALT, VESICLES ABOUT .1MM AT TOP OF
               SECTION GRADUALLY INCREASING TO ABOUT 1MM;

  Groundmass : QUARTZ
               PCE(6) CONTAINS HYDROTHERMAL QUARTZ, PCES(3A,3B)
               CONTAIN QUARTZ INFILLED WITH HYDROTHERMAL
               CALCITE;

  Replacement: CALCITE

               SMECTITE
               GREENISH COLOR POSSIBLY SMEC;


Leg : 76    Top/Bottom Interval(mm):    0/1480  Analyst: Pisciotto, K.
Hole: 534A  Sample Midpoint (m)    :  1652.98
Core: 129   Top of Core Depth (m)  :  1648.50
Sect:  3    Top of Section Depth(m):  1651.50

LITHOLOGY: APHYRIC BASALT;
           VESICULAR;

  Piece No.  : PCES 1A (2-15), 1B (14-21), 2 (24-27), 3 (31-48),
               4 (49-58), 5 (49-61), 6A (63-78), 6B (79-81),
               7A (81-101), 7B (99-111), 7C (112-117),
               7D (117-121), 8 (123-130), 9 (133-141),
               10 (143-148);

  Texture    : APHYRIC, GRAIN-SIZE APPEARS UNIFORM THROUGHOUT
               EXCEPT IN PCES(8,9) WHERE BASALT APPEARS FINE-
               GRAINED NEAR GLASSY(ALTERED) MARGINS, PCE(8) HAS
               GLASSY MARGINS ON THREE SIDES WITH A SINUOUS PATTERN
               OF APHYRIC BASALT IN-BETWEEN, FRAGMENTS IN PCE(9)
               HAVE GLASSY MARGINS AND SEVERAL DARK GLASSY(?)
               BANDS;

  Structure  : SCATTERED CALCITE VEINS AND SMEC-FILLED FRACTURES
               LESS COMMON, BROWNISH CLAY(?) MIXED WITH CALCITE IN
               SOME VEINS;

  Alteration : MOD
               CALCITE/SMECTITE ALTERATION IN PCE(9), PCE(5) IS
               HIGHLY ALTERED TO CALCITE/SMEC, INTENSE CALCITE &
               SMECTITE ALTERATION OF OUTSIDE EDGES OF GLASS;

  Comments   : DARK GREY(N3);

  Vesicles   :
               Location:            Filling: SMECTITE, CALCITE
               GREEN SMEC(?) AND CALCITE FILLED VESICULAR BASALT;

  Replacement: SMECTITE
               ID GREEN SMEC UNCERTAIN IN VESICLES;

               CALCITE

               CLAY
               ID BROWNISH CLAY UNCERTAIN;


Leg : 76    Top/Bottom Interval(mm):    0/1500  Analyst: Kostecki, J.A.
Hole: 534A  Sample Midpoint (m)    :  1654.50
Core: 129   Top of Core Depth (m)  :  1648.50
Sect:  4    Top of Section Depth(m):  1653.00

LITHOLOGY: APHYRIC BASALT;
           VESICULAR;

  Piece No.  : PCES 1A (1-7), 1B (8-10), 1C (10-13), 1D (11-13),
               2A (15-29), 2B (28-46), 2C (46-64), 2D (64-82),
               2E (80-92), 3A (103-136), 3B (140-150);

  Texture    : APHYRIC;

  Structure  : FREQUENT FRACTURING SOMETIMES FILLED WITH
               HYDROTHERMAL QUARTZ AND PALAGONITE, PCE(2B)
               CONTAINS BASALT WITH A PALAGONITE/QUARTZ VEIN;

  Alteration : MOD
               SOME OF THE ALTERED ZONE IS COMPOSED OF PALAG;

  Comments   : ONE FLOW UNIT: 17 PCES(1A-3B);

  Vesicles   : Size(mm):      1-2   Percent:
               Location:            Filling: CALCITE
               SOME OF THE VESICLES ARE BEGINNING TO BE FILLED
               WITH CALCITE-MOSTLY IN THE TOP HALF, PCE(2D) IS
               TYPIFIED BY A DISTINCT LOSS OF VESICLES WHEREAS
               PCES(1A-C) CONTAIN VESICLES OF 1MM AND THE SIZE
               AND FREQUENCY DIMINISHES VERY RAPIDLY BUT IN THE
               MIDDLE OF PCE(2D) THE VESICLES ARE AGAIN PRESENT
               BUT LESS NUMEROUS, THEIR SIZE RANGE IS ABOUT
               1-2MM, THIS TREND CONTINUES UNTIL PCE(3B) WHERE
               VESICLES ARE AGAIN NUMEROUS;

  Groundmass : QUARTZ
               PCE(2A) IS QUARTZ FILLED ABOUT HALF ITS LENGTH
               GRADUALLY CHANGING TO A QUARTZ/PALAGONITE VEIN;

  Replacement: CALCITE

               PALAGONITE


Leg : 76    Top/Bottom Interval(mm):    0/ 890  Analyst: Kostecki, J.A.
Hole: 534A  Sample Midpoint (m)    :  1655.39
Core: 129   Top of Core Depth (m)  :  1648.50
Sect:  5    Top of Section Depth(m):  1654.50

LITHOLOGY: APHYRIC BASALT;
           VESICULAR;

  Piece No.  : PCES 1 (2-12), 2 (15-22), 3 (25-40), 4 (42-61),
               5 (64-66), 6 (70-80), 7 (82-89);

  Texture    : APHYRIC, PCES(1) ARE GLASSY BASALT, PCE(2) HAS A
               GLASSY TOP;

  Structure  : FREQUENT FRACTURES MOSTLY FILLED WITH HYDROTHERMAL
               QUARTZ;

  Alteration : MOD;

  Comments   : TWO FLOW UNITS: 17 PCES(1)-CONTINUED FROM CORE 29-4,
               AND 18 PCES(2-7);

  Vesicles   :
               Location:            Filling: CALCITE, GLASS
               PCE(2) HAS CALCITE FILLING VESICLES WHILE THE
               REMAINDER OF THE SECTION(PCES 3 ON) IS FAIRLY
               SIMILAR WITH ABOUT 50/50 RATIO OF CALCITE TO GLASS
               FILLED VESICLES, PCE(7) CONTAINS 100% CALCITE
               VESICLES;

  Replacement: CALCITE

               GLASS


Leg : 76    Top/Bottom Interval(mm):    0/1500  Analyst: Halley, R.
Hole: 534A  Sample Midpoint (m)    :  1659.00
Core: 130   Top of Core Depth (m)  :  1657.50
Sect:  1    Top of Section Depth(m):  1657.50

LITHOLOGY: APHYRIC BASALT;
           VESICULAR;

  Piece No.  : PCES 1A (0-14), 1B (13-21), 1C (22-23), 2A (25-36),
               2B (34-41), 2C (37-41), 3A (42-46), 3B (43-51),
               3C (52-54), 4A (55-61), 4B (61-67), 4C (66-70),
               5 (71-73), 6A (74-92), 6B (93-100), 7 (101-130),
               8 (131-139), 9 (113-146);

  Texture    : APHYRIC, GENERALLY GRAINS ARE TOO SMALL TO SEE BUT
               PLAG LATHS >1MM ARE APPARENT IN PCES(2-4), CHILLED
               MARGINS AT (0,98,148 CM) ARE VERY NARROW(3-5MM) AND
               HAVE LOST MOST OF THEIR GLASSY LUSTRE, POSSIBLE
               CHILLED MARGIN AT 76CM;

  Structure  : FRACTURES OCCASIONALLY FILLED WITH CALCITE IN PCES
               (6,7) WHILE OTHERS MAY BE FILLED WITH CELADONITE OR
               CLAY, MARGIN AT 143CM IS HIGHLY FRACTURED;

  Alteration : MOD
               ALTERATION RIMS APPAARENT ONLY IN PCE(6C), MARGIN
               AT 143CM MAY BE ALTERATION ZONE;

  Comments   : DARK GREY(N3), THREE FLOW UNITS: 19 PCES(1A-5),
               20 PCES (6A-B), 21 PCES(7-9);

  Vesicles   : Size(mm):    0.1-1   Percent:
               Location:            Filling: CELADONITE, SMEC

               Location:            Filling: CALCITE, PYRITE,

               Location:            Filling: CHALCEDONY
               VESICLES USUALLY FILLED WITH DARK MINERAL-
               CELADONITE, SMEC(?), WITH ABOUT 30% FILLED WITH
               CALCITE(MORE LOCALLY AT  7&8), AND A FEW FILLED
               WITH CHALCEDONY OR PYRITE;

  Groundmass : PLAGIOCLASE
               Size(mm):         >1
               PLAG LATHS >1MM APPARENT IN PCES(2-4);

  Replacement: PYRITE
               SCATTERED ALONG FRACTURES;

               CALCITE

               CHALCEDONY

               SMECTITE
               ID SMEC IN VESICLES UNCERTAIN;

               CELADONITE

               CLAY


Leg : 76    Top/Bottom Interval(mm):    0/1500  Analyst: Halley, R.
Hole: 534A  Sample Midpoint (m)    :  1660.50
Core: 130   Top of Core Depth (m)  :  1657.50
Sect:  2    Top of Section Depth(m):  1659.00

LITHOLOGY: APHYRIC BASALT;
           VESICULAR;

  Piece No.  : PCES 1 (0-14), 2A (15-44), 2B (45-66), 2C (66-69),
               3 (71-75), 4 (78-83), 5 (85-86), 6 (90-102),
               7 (104-150);

  Texture    : APHYRIC, CHILLED MARGIN AT TOP OF PCE(6)-90CM AND
               VERY NARROW AND PRESERVED ONLY AT TOP OF PCE;

  Structure  : FRACTURES FILLED WITH WHITE(N9) CALCITE AND CLEAR
               QUARTZ AND BLACK(N1) &/OR LIGHT OLIVE BROWN(5Y5/6)
               MINERAL, GLASSY VEIN AT 80CM, 40CM(OBLIQUE);

  Alteration : MOD
               ALTERATION RIMS ARE NARROW-LESS THAN 2MM, LIGHT
               BROWN(5YR5/6) TO DARK YELLOWISH-ORANGE(10YR6/6);

  Comments   : DARK GREY(N3), FLOW UNITS: 22 PCES(1-5) AND 23
               PCES(6-7);

  Vesicles   : Size(mm):    0.1-1   Percent:
               Location:            Filling: CELADONITE, SMEC

               Location:            Filling: CALCITE, PYRITE,

               Location:            Filling: QUARTZ
               USUALLY FILLED WITH DARK MINERAL(N1) POSSIBLY
               CELADONITE OR SMEC AND CA. 30% FILLED WITH CALCITE
               AND A FEW WITH PYRITE OR QUARTZ;

  Groundmass : PLAGIOCLASE
               Size(mm):      0.5-1
               PLAG LATHS USUALLY LARGE ENOUGH TO BE SEEN BY EYE;

  Replacement: CELADONITE

               SMECTITE

               CALCITE

               PYRITE


Leg : 76    Top/Bottom Interval(mm):    0/1480  Analyst: Halley, R.
Hole: 534A  Sample Midpoint (m)    :  1661.98
Core: 130   Top of Core Depth (m)  :  1657.50
Sect:  3    Top of Section Depth(m):  1660.50

LITHOLOGY: APHYRIC BASALT;
           SAME AS DESCRIBED IN CORE 130 SECTION(1-2);

  Piece No.  : PCES 1 (3-5), 2 (7-23), 3 (27-37), 4A (40-44),
               4B (44-60), 4C (60-67), 5A (69-77), 5B (74-78),
               6 (80-81), 7A (82-92), 7B (93-100), 8 (101-103),
               9A (104-116), 9B (116-132), 9C (133-147);

  Texture    : APHYRIC, CHILLED MARGIN AT TOP OF PCE(2);

  Structure  : FRACTURES;

  Comments   : TWO CONTINUING FLOW UNITS: 23 PCES(PREVIOUS SECTION
               TO 1), 24 PCES(2-9C);

  Vesicles   : VESICLES ARE BLACK INFILLED AND LIGHT GREY AND
               SHOW ANTIPATHETIC DISTRIBUTION-FORMER CLOSER TO
               FRACTURES;


Leg : 76    Top/Bottom Interval(mm):    0/1450  Analyst: Halley, R.
Hole: 534A  Sample Midpoint (m)    :  1663.45
Core: 130   Top of Core Depth (m)  :  1657.50
Sect:  4    Top of Section Depth(m):  1662.00

LITHOLOGY: APHYRIC BASALT;
           SAME AS IN PREVIOUS THREE SECTIONS;

  Piece No.  : PCES 1 (0-6), 2 (7-20), 3A (21-30), 3B (31-44),
               4 (45-46), 5 (47-53), 6 (55-72), 7 (75-93),
               8 (95-98), 9 (101-102), 10 (105-102), 11 (124-133),
               12 (137-145);

  Texture    : APHYRIC, CHILLED MARGINS(?) AT TOP OF PCES(3B,7)-
               NEITHER IS GLASSY, VERY DENSE;

  Structure  : FRACTURE AT TOP OF PCE(3B) LOOKS MORE LIKE A VEIN/
               FRACTURE;

  Comments   : TWO FLOW UNITS: 24 PCES(FROM 130-3 TO 6) AND
               25 PCES(7-12);


Leg : 76    Top/Bottom Interval(mm):    0/1350  Analyst: Halley, R.
Hole: 534A  Sample Midpoint (m)    :  1664.85
Core: 130   Top of Core Depth (m)  :  1657.50
Sect:  5    Top of Section Depth(m):  1663.50

LITHOLOGY: APHYRIC BASALT;
           SAME AS PREVIOUS FOUR SECTIONS;

  Piece No.  : PCES 1A (1-15), 1B (15-21), 2 (25-46), 3 (51-60),
               4 (61-65), 5 (67-71), 6A (74-91), 6B (92-94),
               7 (98-107), 8 (110-126), 9 (129-135);

  Texture    : APHYRIC, CHILLED GLASSY MARGIN EXHIBITED AT TOP OF
               PCES(1A,1D,5,8), PCE(7) HAS CONSIDERABLE GLASS AND
               IS VERY FINE-GRAINED WITH NO MACROSCOPIC PLAG-
               MAYBE A HOLOHYALINE OR HYPOCRYSTALLINE BASALT,
               PCE(7) ALSO CONTAINS GLASSY SHARDS-PROBABLY A
               HYALOCLASTITE;

  Alteration : MOD;

  Comments   : THREE FLOW UNITS: 26 PCES(1A-4), 27 PCES(5-6B),
               28 PCES (7-9);

  Vesicles   : PCE(7) DIFFERS FROM REST BECAUSE IT HAS NO
               VESICLES;


Leg : 76    Top/Bottom Interval(mm):    0/ 910  Analyst: Halley, R.
Hole: 534A  Sample Midpoint (m)    :  1665.91
Core: 130   Top of Core Depth (m)  :  1657.50
Sect:  6    Top of Section Depth(m):  1665.00

LITHOLOGY: APHYRIC BASALT;

  Piece No.  : PCES 1A (4-13), 1B (14-63), 2 (66-78), 3A (80-83),
               3B (80-83), 3C (85-87), 3D (85-92), 3E (88-91);

  Texture    : PRINCIPALLY APHYRIC, POSSIBLE GLASSY MARGINS AT BASE
               OF PCE(1A) AND TOP OF PCE(1B);

  Structure  : CALCITE VEINS SPARSE IN PCE(1B), AT BASE OF PCE(1A)
               AND TOP OF PCE(2B) HAVE QUARTZ AND CALCITE AND
               GLASSY BASALT(12.5-15CM);

  Alteration : MOD;

  Comments   : PCES IN THIS SECTION EXCEPT PCES(1A-B) ARE
               HOMOGENEOUS, TWO FLOW UNITS: 28 PCES(CONTINUING FROM
               130-5 TO 1A), 29 PCES(1B-3E);

  Vesicles   :
               Location:            Filling: CLAY, CALCITE
               CLAY AND CALCITE FILLED VUGS;

  Groundmass : QUARTZ
               PRESENT AT 12.5-15CM;

  Replacement: CALCITE
               ALSO PRESENT AT 12.5-15CM;

               CLAY


    

Introduction


Cite as: Deep Sea Drilling Project (1989): Archive of Core and Site/Hole Data and Photographs from the Deep Sea Drilling Project (DSDP). National Geophysical Data Center, NOAA. doi:10.7289/V54M92G2 [access date]

These Web pages are from the Core Data from the Deep Sea Drilling Project Legs 1-96 CD-ROM produced in 1989 and modified in 2000 by the U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite, Data, and Information Service, National Geophysical Data Center (now part of the National Centers for Environmental Information), and collocated World Data Center for Marine Geology and Geophysics, Boulder (now part of the World Data Service for Geophysics). Data were compiled in cooperation with the U.S. Science Support Program, of the Joint Oceanographic Institutions, Inc. (now the Consortium for Ocean Leadership), and the U.S. National Science Foundation.

Please see NOAA's privacy and disclaimer information. Send questions or comments to mgg.info@noaa.gov.

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