NOAA logo, National Centers for Environmental Information, National Oceanic and Atmospheric Administration NSF logo, National Science Foundation, Division of Ocean Sciences

Core Data from the Deep Sea Drilling Project


Leg : 74    Top/Bottom Interval(mm):    0/ 990  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   474.49
Core:  39   Top of Core Depth (m)  :   473.50
Sect:  1    Top of Section Depth(m):   473.50

LITHOLOGY: SEDIMENT;


Leg : 74    Top/Bottom Interval(mm):  990/1500  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   475.00
Core:  39   Top of Core Depth (m)  :   473.50
Sect:  1    Top of Section Depth(m):   474.49

LITHOLOGY: PLAG PHYRIC BASALT;

  Piece No.  : PCES 1 (99-111), 2A (113-122), 2B (123-138),
               2C (139-143), 2D (143-150);

  Texture    : PHYRIC,FINE-GRAINED,PCE 1 REPRESENTS AN UPPER
               CHILLED MARGIN WITH ALT.GLAS RIND;

  Structure  : PCE 1 ALT.GLAS RIND IS CAPPED BY THICK PALE GREEN
               CLAY.MIN VEIN,4MM WIDE SMEC VEIN BETWEEN PCES 2C &
               2D;

  Alteration : MOD
               PCE 1 HAS ALT.GLAS RIND;

  Comments   : MEDIUM GRAY BASALT,PCE 1 BEGINS UNIT 1;

  Phenocrysts: PLAGIOCLASE
               Size(mm):      TO 10
               PHENOS UP TO 10X5MM;

  Replacement: CLAY MINERALS
               PALE GREEN CLAY.MIN VEIN CAPS ALT.GLAS RIND ON
               PCE 1;

               SMECTITE
               4MM WIDE SMEC VEIN BETWEEN PCES 2C & 2D;

               UNIDENTIFIED
               Minerals Replaced: GLASS
               ALT.GLAS RIND ON PCE 1;


Leg : 74    Top/Bottom Interval(mm):    0/1500  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   476.50
Core:  39   Top of Core Depth (m)  :   473.50
Sect:  2    Top of Section Depth(m):   475.00

LITHOLOGY: PLAG MOD TO SPARSELY PHYRIC BASALT;

  Piece No.  : PCES 1A (1-5), 1B (5-22), 1C (21-42), 1D (38-66),
               1E (67-80), 1F (78-134), 1G (134-149);

  Texture    : PLAG PHENO ABUNDANCE VARIES DRASTICALLY FROM MOD
               PHYRIC IN PCES 1A-1B+1E+1G TO ESSENTIALLY APHYRIC IN
               THE LOWER TWO-THIRDS OF PCE 1F,NO CONTACTS OR
               CHANGES IN GNDMASS GRAINSIZE IMMEDIATELY
               DISCERNABLE,MEDIUM-GRAINED;

  Structure  : MAJORITY OF FRACTURES BETWEEN PCES HAVE DARK GREEN
               SMEC FILLINGS & PYR LININGS;

  Alteration : MOD
               0-110CM;
               MOD TO EXT
               110-149CM;

  Comments   : MEDIUM GRAY BASALT,CONTINUATION OF UNIT 1;

  Phenocrysts: PLAGIOCLASE               ( 5-10%)
               PLAG PHENO ABUNDANCE VARIES DRASTICALLY;

                                         (    0%)
               LOWER TWO-THIRDS OF PCE 1F IS ESSENTIALLY APHYRIC;

  Replacement: SMECTITE

               MAJORITY OF FRACTURES BETWEEN PCES HAVE DARK GREEN
               SMEC FILLINGS & PYR LININGS;


Leg : 74    Top/Bottom Interval(mm):    0/1450  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   477.95
Core:  39   Top of Core Depth (m)  :   473.50
Sect:  3    Top of Section Depth(m):   476.50

LITHOLOGY: PLAG PHYRIC BASALT;

  Piece No.  : PCES 1A (1-5), 1B (3-7), 1C (6-11), 1D (12-85),
               1E (84-86), 1F (85-103), 1G (103-122), 1H (122-145);

  Texture    : PHYRIC,MEDIUM-GRAINED,SAME AS CORES 39-1 & 39-2,
               LOCAL XTL LIQUID SORTING APPEARS TO HAVE TAKEN PLACE

  Alteration : MOD TO EXT

  Comments   : MEDIUM-GRAY BASALT,CONTINUATION OF UNIT 1;

  Phenocrysts: PLAGIOCLASE
               Size(mm):      TO 10

  Replacement: PHENOS ARE 10X5MM IN SIZE;

               CLAY MINERALS
               DARK GREEN CLAY.MIN MAKES UP 5% OF GNDMASS;


Leg : 74    Top/Bottom Interval(mm):    0/1450  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   479.45
Core:  39   Top of Core Depth (m)  :   473.50
Sect:  4    Top of Section Depth(m):   478.00

LITHOLOGY: PLAG MOD PHYRIC TO PHYRIC BASALT;

  Piece No.  : PCES 1A (1-13), 1B (9-22), 1C (20-55), 1D (55-85),
               1E (86-120), 1F (115-145);

  Texture    : MOD PHYRIC TO PHYRIC,MEDIUM-GRAINED,SAME BASALT AS
               IN CORES 39-1 THRU 39-3 WITH DECREASE IN PHENO
               ABUNDANCE;

  Structure  : NUMEROUS MEDIUM-GREEN CLAY.MIN & PYR-FILLED VEINS;

  Alteration : MOD TO EXT
               INTERVAL 1-42CM;
               MOD
               INTERVAL 42-145CM;

  Comments   : MEDIUM-GRAY BASALT,CONTINUATION OF UNIT 1;

  Phenocrysts: PLAGIOCLASE
               PLAG ABUNDANCE DECREASES FROM PREVIOUS SECTIONS;

  Replacement: CLAY MINERALS

               NUMEROUS MEDIUM-GREEN CLAY.MIN & PYR FILLED VEINS;


Leg : 74    Top/Bottom Interval(mm):    0/1500  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   484.50
Core:  40   Top of Core Depth (m)  :   483.00
Sect:  1    Top of Section Depth(m):   483.00

LITHOLOGY: PLAG PHYRIC BASALT;
           MASSIVE BASALT;

  Piece No.  : PCES 1A (0-15), 1B (15-65), 1C (64-113),
               1D (113-119), 1E (120-150);

  Texture    : PHYRIC,MEDIUM-GRAINED,NO OBSERVED GLASSY MARGINS;

  Structure  : MASSIVE BASALT,TWO VEINS(FILLED WITH SMEC?) ARE
               PRESENT BETWEEN PCES 1A-1B & 1D-1E;

  Alteration : MOD

  Comments   : MEDIUM-GRAY BASALT,CONTINUATION OF UNIT 1;

  Phenocrysts: PLAGIOCLASE
               Size(mm):      TO 10
               PLAG PHENOS ARE LARGE(5X10MM);

  Replacement: SMECTITE
               ID SMEC UNCERTAIN-FILLS VEINS;


Leg : 74    Top/Bottom Interval(mm):    0/1500  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   486.00
Core:  40   Top of Core Depth (m)  :   483.00
Sect:  2    Top of Section Depth(m):   484.50

LITHOLOGY: PLAG PHYRIC BASALT;
           MASSIVE BASALT;

  Piece No.  : PCES 1A (0-14), 1B (14-60), 1C (60-88), 1D (88-132),
               1E (132-150);

  Texture    : PHYRIC,FINE-GRAINED;

  Structure  : SMALL VEIN LOCATED IN PCE 1D & AT THE BASE OF PCE 1D
               FILLED WITH CALCITE & SMEC(?),MASSIVE BASALT;

  Alteration : MOD

  Comments   : GRAY BASALT,CONTINUATION OF UNIT 1;

  Phenocrysts: PLAGIOCLASE

               OLIVINE
               ID OL UNCERTAIN-DARKER GREEN PHENOS & SAME
               MATERIAL IS ALSO PRESENT IN PLAG PHENOS;

  Replacement: SMECTITE
               ID SMEC UNCERTAIN-FOUND IN VEINS IN PCE 1D;

               CALCITE
               FOUND IN VEINS IN PCE 1D;


Leg : 74    Top/Bottom Interval(mm):    0/1450  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   487.45
Core:  40   Top of Core Depth (m)  :   483.00
Sect:  3    Top of Section Depth(m):   486.00

LITHOLOGY: PLAG PHYRIC BASALT;
           MASSIVE BASALT;

  Piece No.  : PCES 1A (0-10), 1B (10-39), 1C (39-88), 1D (88-130),
               1E (130-145);

  Texture    : PHYRIC,MEDIUM-GRAINED;

  Structure  : TWO SMALL VEINS(1MM) SMEC VEINS ARE LOCATED AT THE
               BOTTOM OF PCES 1A+1D,MASSIVE BASALT;

  Alteration : MOD

  Comments   : GRAY BASALT,CONTINUATION OF UNIT 1;

  Phenocrysts: PLAGIOCLASE               (15-20%)
               Size(mm):      TO 10

  Replacement: SMECTITE
               SMALL SMEC VEINS IN PCES 1A+1D;


Leg : 74    Top/Bottom Interval(mm):    0/1500  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   489.00
Core:  40   Top of Core Depth (m)  :   483.00
Sect:  4    Top of Section Depth(m):   487.50

LITHOLOGY: PLAG PHYRIC BASALT;
           MASSIVE BASALT;

  Piece No.  : PCES 1A (0-8), 1B (8-15), 1C (15-25), 1D (25-52),
               1E (52-101), 1F (101-125), 1G (126-150);

  Texture    : PHYRIC,MEDIUM-GRAINED,NO GLASSY MARGINS NOTICED;

  Structure  : NO VEINS OBSERVED,MASSIVE BASALT;

  Alteration : MOD

  Comments   : MEDIUM-GRAY BASALT,CONTINUATION OF UNIT 1;

  Phenocrysts: PLAGIOCLASE
               PHENOS ARE LARGE WITH MICROPHENOS WITHIN PHENOS;


Leg : 74    Top/Bottom Interval(mm):    0/1450  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   490.45
Core:  40   Top of Core Depth (m)  :   483.00
Sect:  5    Top of Section Depth(m):   489.00

LITHOLOGY: PLAG PHYRIC BASALT;
           MASSIVE BASALT;

  Piece No.  : PCES 1A (0-28), 1B (21-68), 1C (69-140),
               1D (140-145);

  Texture    : PHYRIC,MEDIUM-GRAINED,NO GLASSY MARGINS NOTICED;

  Structure  : VERY THIN FILLED FRACTURES,MASSIVE BASALT;

  Alteration : MOD
               NO ALTERATION RINDS PRESENT;

  Comments   : MEDIUM-GRAY BASALT,CONTINUATION OF UNIT 1;

  Phenocrysts: PLAGIOCLASE
               Size(mm):      TO 15
               SHAPES OF PHENOS VARIABLE WITH LARGEST APPROX
               5X15MM LONG;

  Replacement: UNIDENTIFIED
               UNIDENT.MIN FILLS THIN FRACTURES;


Leg : 74    Top/Bottom Interval(mm):    0/1500  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   492.00
Core:  40   Top of Core Depth (m)  :   483.00
Sect:  6    Top of Section Depth(m):   490.50

LITHOLOGY: PLAG PHYRIC BASALT;
           MASSIVE BASALT;

  Piece No.  : PCES 1A (0-10), 1B (10-25), 1C (25-31), 1D (32-40),
               1E (40-55), 1F (55-85), 1G (85-95), 1H (95-125),
               1I (125-145), 1J (145-150);

  Texture    : PHYRIC,MEDIUM-GRAINED;

  Structure  : MASSIVE BASALT,PCE 1J FRACTURED LONGITUDINALLY,PCE
               1D CONTAINS A FRACTURED FILLED VEIN;

  Alteration : MOD
               A LITTLE ALTERATION ZONE ACCOMPANIES VEIN IN PCE
               1D;

  Comments   : MEDIUM-GRAY BASALT,CONTINUATION OF UNIT 1;

  Phenocrysts: PLAGIOCLASE
               Size(mm):      TO 15
               LARGE PHENOS 8X15MM;

               OLIVINE
               ID OL UNCERTAIN-LARGE GREENISH-BLACK PHENOS(WHICH
               ARE POSSIBLY OL) PRESENT IN PCE 1J;


Leg : 74    Top/Bottom Interval(mm):    0/ 100  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   492.10
Core:  41   Top of Core Depth (m)  :   492.00
Sect:  1    Top of Section Depth(m):   492.00

LITHOLOGY: PLAG PHYRIC BASALT;
           MASSIVE BASALT;

  Piece No.  : PCE 1A (0-10);

  Texture    : PHYRIC,MEDIUM-GRAINED,NO GLASS SURFACE;

  Structure  : MASSIVE BASALT,SMALL SMEC VEIN PRESENT;

  Alteration : MOD
               NO WEATHERED SURFACE;

  Comments   : MEDIUM-GRAY BASALT,PCE 1 ENDS UNIT 1,LACK OF GLASS
               &/OR WEATHERED SURFACES SUGGESTS CONTACT BETWEEN THE
               BASALT & UNDERLYING SEDIMENT IS MISSING;

  Phenocrysts: PLAGIOCLASE

  Replacement: SMECTITE
               PRESENT IN SMALL VEIN;


Leg : 74    Top/Bottom Interval(mm):  100/ 920  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   492.92
Core:  41   Top of Core Depth (m)  :   492.00
Sect:  1    Top of Section Depth(m):   492.10

LITHOLOGY: SEDIMENT;


Leg : 74    Top/Bottom Interval(mm):  920/1500  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   493.50
Core:  41   Top of Core Depth (m)  :   492.00
Sect:  1    Top of Section Depth(m):   492.92

LITHOLOGY: APHYRIC BASALT;

  Piece No.  : PCES 2A (92-94), 2B (96-99), 2C (100-103),
               2D (104-106), 2E (107-110), 2F (112-115),
               2G (116-120), 3A (122-126), 3B (127-129),
               3C (129-130), 4A (133-141), 4B (142-145),
               4C (146-149);

  Texture    : APHYRIC,PCES 2A+4B-4C HAVE WEATHERED GLASSY RINDS &
               PCES 4B+4C REPRESENT CONTACT WITH UNDERLYING
               SEDIMENT,FINE-GRAINED;

  Structure  : PCE 2E HAS CALCITE VEIN ON EXTERIOR;

  Alteration : MOD TO EXT
               PCES 2A+4B-4C HAVE ALT.GLAS RINDS;

  Comments   : GRAY BASALT,PCE 2A BEGINS UNIT 2,PCES 4B+4C HAVE
               CALCAREOUS MUDSTONE ON ONE SIDE;

  Vesicles   :
               Location:            Filling: CALCITE,PYR
               SOME VESICLES(VUGS) ARE PRESENT WITH CALCITE & PYR
               XTLS PARTIALLY FILLING THE VOIDS;

  Replacement: CALCITE
               FILLS VEIN ON PCE 2E,XTLS PARTIALLY FILLS VESICLES
               (VUGS)-ESPECIALLY IN PCES 4B-4C;

               FOUND IN PCES 2D+2G,XTLS PARTIALLY FILLS VESICLES
               (VUGS)-ESPECIALLY IN PCES 4B-4C;

               UNIDENTIFIED
               Minerals Replaced:  GLASS
               ALT.GLAS RINDS ON PCES 2A+4B-4C;


Leg : 74    Top/Bottom Interval(mm):    0/ 250  Analyst: Futterer, D.
Hole: 528   Sample Midpoint (m)    :   493.75
Core:  41   Top of Core Depth (m)  :   492.00
Sect:  2    Top of Section Depth(m):   493.50

LITHOLOGY: SEDIMENT;


Leg : 74    Top/Bottom Interval(mm):  250/1500  Analyst: Futterer, D.
Hole: 528   Sample Midpoint (m)    :   495.00
Core:  41   Top of Core Depth (m)  :   492.00
Sect:  2    Top of Section Depth(m):   493.75

LITHOLOGY: APHYRIC BASALT;

  Piece No.  : PCES 1A (26-28), 1B (26-30), 1C (29-36),
               2A (39-40), 2B (39-47), 3A (50-52), 3B (54-59),
               4 (61-66), 5A (68-72), 5B (72-74), 5C (75-77),
               5D (78-84), 6 (85-92), 7 (94-140), 8 (143-148);

  Texture    : APHYRIC,FINE-GRAINED,NO GLASSY MARGINS;

  Alteration : MOD TO EXT
               PCES 1A-6+8;
               EXT
               PCE 7 IS HIGHLY WEATHERED & CRUMBLY;

  Comments   : GRAY BASALT,BOTTOM OF PCE 7 MAY HAVE WASHED AWAY,
               RECOVERY WAS LOW,NO WEATHERED RINDS NOTICED
               SUGGESTING CONTACTS WERE WASHED OUT,PCE 8 MAY
               REPRESENT BEGINNING OF ANOTHER SUBUNIT,
               CONTINUATION OF UNIT 2;

  Vesicles   : SMALL VESICLES NOTED IN SOME PCES,VESICLE
               ABUNDANCE INCREASES TO A MAXIMUM IN PCE 7;


Leg : 74    Top/Bottom Interval(mm):    0/1450  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   502.45
Core:  42   Top of Core Depth (m)  :   501.00
Sect:  1    Top of Section Depth(m):   501.00

LITHOLOGY: APHYRIC BASALT;

  Piece No.  : PCES 1A (0-9), 1B (9-22), 1C (23-33), 1D (33-40),
               1E (40-50), 1F (52-60), 1G (60-66), 1H (65-71),
               1I (72-89), 1J (78-89), 1K (89-95), 1L (95-101),
               1M (101-105), 1N (105-110), 1O (110-117),
               1P (117-143);

  Texture    : APHYRIC,FINE-GRAINED;

  Structure  : VOIDS SOMETIMES PARTIALLY FILLED WITH CALCITE & PYR;

  Alteration : MOD TO EXT

  Comments   : MEDIUM-GRAY BASALT,PCE 1P ENDS UNIT 2;

  Vesicles   :
               Location:            Filling: CALCITE,PYR
               VESICLES SOMETIMES PARTIALLY FILLED WITH CALCITE &
               PYR,VESICLES COMPLETELY FILLED WITH SMEC;

  Replacement: CALCITE

               CALCITE & PYR SOMETIMES PARTIALLY FILL VESICLES &
               VOIDS;

               SMECTITE
               FILLS VESICLES;


Leg : 74    Top/Bottom Interval(mm):    0/1100  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   503.60
Core:  42   Top of Core Depth (m)  :   501.00
Sect:  2    Top of Section Depth(m):   502.50

LITHOLOGY: SEDIMENT;
           LIMESTONE;


Leg : 74    Top/Bottom Interval(mm): 1100/1500  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   504.00
Core:  42   Top of Core Depth (m)  :   501.00
Sect:  2    Top of Section Depth(m):   503.60

LITHOLOGY: PLAG PHYRIC BASALT;

  Piece No.  : PCES 1 (110-115), 2A (117-137), 2B (137-147);

  Texture    : PHYRIC,MEDIUM-GRAINED;

  Structure  : LARGE CALCITE & SMEC-FILLED VEIN IN PCE 2A;

  Alteration : MOD
               PCE 1 HAS WEATHERED RIND(SMEC);

  Comments   : MEDIUM GRAY BASALT,PCE 1 BEGINS UNIT 3;

  Phenocrysts: PLAGIOCLASE
               Size(mm):      TO 10
               PLAG XTLS ARE 5X10MM;

  Replacement: SMECTITE

               CALCITE
               CALCITE & SMEC FILL VEIN IN PCE 2A,SMEC RIND ON
               PCE 1;


Leg : 74    Top/Bottom Interval(mm):    0/1500  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   505.50
Core:  42   Top of Core Depth (m)  :   501.00
Sect:  3    Top of Section Depth(m):   504.00

LITHOLOGY: PLAG PHYRIC BASALT;

  Piece No.  : PCES 1A (0-7), 1B (7-13), 1C (13-17), 1D (18-35),
               1E (35-50), 1F (50-78), 1G (78-83), 1H (84-97),
               1I (97-104), 1J (102-112), 1K (113-120),
               1L (120-135), 1M (135-146);

  Texture    : PHYRIC,MEDIUM-GRAINED;

  Structure  : VEINS CONTAIN A DARK CLAY.MIN & PYR,PCE 1L HAS VEIN
               WITH AN ALTERED ZONE;

  Alteration : MOD
               ALTERED ZONE ASSOCIATED WITH VEIN IN PCE 1L;

  Comments   : MEDIUM-GRAY BASALT,CONTINUATION OF UNIT 3;

  Vesicles   :
               Location:            Filling: SMEC
               PCE 1F HAS SMEC(?)-FILLED VESICLES;

  Phenocrysts: PLAGIOCLASE

  Replacement: SMECTITE
               FILLS VESICLES-ID UNCERTAIN;


               CLAY MINERALS
               DARK CLAY.MIN & PYR IN VEINS,PYR ALSO FOUND IN PCE
               1D;


Leg : 74    Top/Bottom Interval(mm):    0/1450  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   506.95
Core:  42   Top of Core Depth (m)  :   501.00
Sect:  4    Top of Section Depth(m):   505.50

LITHOLOGY: PLAG PHYRIC BASALT;

  Piece No.  : PCES 1A (0-5), 1B (6-14), 1C (15-27), 1D (26-37),
               1E (39-47), 1F (47-50), 2A (52-60), 2B (60-71),
               2C (72-76), 2D (76-88), 2E (88-99), 3A (101-106),
               3B (106-115), 3C (116-126), 3D (129-134),
               3E (134-145);

  Texture    : PHYRIC,MEDIUM-GRAINED;

  Structure  : VEINS PRESENT AT THE TOP & ARE FILLED WITH DARK
               GREEN SMEC & PYR,FRACTURES BECOME MORE EVIDENT &
               NUMEROUS DOWNWARD FROM PCE 2D TO PCE 3E & MOST
               APPEAR TO BE VERTICAL TO SUBVERTICAL;

  Alteration : MOD

  Comments   : MEDIUM-GRAY BASALT,CONTINUATION OF UNIT 3;

  Phenocrysts: PLAGIOCLASE

  Replacement: SMECTITE

               SMEC & PYR FILL VEINS,PYR FOUND SCATTERED
               THROUGHOUT;


Leg : 74    Top/Bottom Interval(mm):    0/ 500  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   507.50
Core:  42   Top of Core Depth (m)  :   501.00
Sect:  5    Top of Section Depth(m):   507.00

LITHOLOGY: PLAG PHYRIC BASALT;

  Piece No.  : PCES 1A (0-7), 1B (7-19), 1C (20-50);

  Texture    : PHYRIC,SIMILAR TEXTURE & COMPOSITION TO CORE 42-4;

  Alteration : MOD

  Comments   : MEDIUM-GRAY BASALT,PCE 1C ENDS UNIT 3;

  Phenocrysts: PLAGIOCLASE


Leg : 74    Top/Bottom Interval(mm):    0/1350  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   511.35
Core:  43   Top of Core Depth (m)  :   510.00
Sect:  1    Top of Section Depth(m):   510.00

LITHOLOGY: SEDIMENT;


Leg : 74    Top/Bottom Interval(mm): 1350/1500  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   511.50
Core:  43   Top of Core Depth (m)  :   510.00
Sect:  1    Top of Section Depth(m):   511.35

LITHOLOGY: PLAG PHYRIC BASALT;

  Piece No.  : PCE 1 (135-150);

  Texture    : PHYRIC,FINE-GRAINED;

  Alteration : MOD TO EXT
               ALTERED RIM OCCURS AT CONTACT OF OVERLYING
               SEDIMENT & BASALT;

  Comments   : PCE 1 BEGINS UNIT 4,MEDIUM GRAY BASALT;

  Vesicles   :
               Location:            Filling: CLAY.MIN,CALCITE
               VESICLES PRESENT WITH SOME FILLED WITH CLAY.MIN,
               LARGER VESICLES OR VUGS ARE FILLED WITH CALCITE
               XTLS;

  Phenocrysts: PLAGIOCLASE

  Replacement: CLAY MINERALS
               CLAY.MINS FILL SOME VESICLES;

               CALCITE
               LARGER VESICLES & VUGS FILLED WITH CALCITE;


Leg : 74    Top/Bottom Interval(mm):    0/1500  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   513.00
Core:  43   Top of Core Depth (m)  :   510.00
Sect:  2    Top of Section Depth(m):   511.50

LITHOLOGY: PLAG PHYRIC BASALT;

  Piece No.  : PCES 1A (0-7), 1B (7-14), 1C (15-32), 1D (32-65),
               1E (65-80), 1F (80-110), 1G (108-126), 1H (127-150);

  Texture    : PHYRIC,MEDIUM-GRAINED,PCES 1A-1C FINE-GRAINED WITH
               GRAINSIZE INCREASING FROM UPPER CHILLED MARGIN FROM
               CORE 43-1;

  Alteration : MOD

  Comments   : CONTINUATION OF UNIT 4,MEDIUM-GRAY BASALT;

  Vesicles   :
               Location:            Filling: SMEC,PYR
               UPPER 60CM OF CORE IS VESICULAR WITH SMEC & MINOR
               PYR FILLING;

  Phenocrysts: PLAGIOCLASE

  Replacement: SMECTITE

               SMEC & MINOR PYR FILL VESICLES;


Leg : 74    Top/Bottom Interval(mm):    0/ 950  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   513.95
Core:  43   Top of Core Depth (m)  :   510.00
Sect:  3    Top of Section Depth(m):   513.00

LITHOLOGY: PLAG PHYRIC BASALT;

  Piece No.  : PCES 1A (0-21), 1B (21-54), 1C (52-85), 1D (86-95);

  Texture    : PHYRIC,MEDIUM-GRAINED,SAME AS CORES 43-1 & 43-2,PCE
               1D HAS VERY FINE-GRAINED LOWER MARGIN REPRESENTING
               BOTTOM OF COOLING UNIT;

  Alteration : MOD
               OL(?) & CPX(?) PHENOS ALTERED;

  Comments   : PCE 1D ENDS UNIT 4,MEDIUM-GRAY BASALT;

  Phenocrysts: PLAGIOCLASE

               OLIVINE

               CLINOPYROXENE
               ID OL & CPX UNCERTAIN-POSSIBLY ALTERED;

  Replacement: CLAY MINERALS
               Minerals Replaced: OL,CPX
               GREEN CLAY.MIN POSSIBLY REPLACES OL & CPX;


Leg : 74    Top/Bottom Interval(mm):  950/1500  Analyst: Borella, P.E.
Hole: 528   Sample Midpoint (m)    :   514.50
Core:  43   Top of Core Depth (m)  :   510.00
Sect:  3    Top of Section Depth(m):   513.95

LITHOLOGY: SEDIMENT;


Leg : 74    Top/Bottom Interval(mm):    0/1120  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   520.12
Core:  44   Top of Core Depth (m)  :   519.00
Sect:  1    Top of Section Depth(m):   519.00

LITHOLOGY: SEDIMENT;
           LIMESTONE;


Leg : 74    Top/Bottom Interval(mm): 1120/1500  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   520.50
Core:  44   Top of Core Depth (m)  :   519.00
Sect:  1    Top of Section Depth(m):   520.12

LITHOLOGY: PLAG MOD PHYRIC BASALT;

  Piece No.  : PCES 2 (113-117), 3A (119-137), 3B (137-149);

  Texture    : MOD PHYRIC,FINE-TO-MEDIUM-GRAINED,PCE 2 HAS ALT.GLAS
               MARGIN;

  Alteration : MOD TO EXT

  Comments   : PCE 2 BEGINS UNIT 5,MEDIUM-GRAY BASALT;

  Vesicles   : PCE 3B HAS CARB.UNSPEC-FILLED VUGS AT TOP & BOTTOM
               WITH FACETED CALCITE XTLS & MINOR PYR;

  Phenocrysts: PLAGIOCLASE

  Replacement: UNIDENTIFIED
               Minerals Replaced: GLASS
               ALT.GLAS MARGIN;

               CARBONATE
               CARB.UNSPEC FILLS VUGS IN PCE 3B;

               MINOR PYR FOUND IN VUGS IN PCE 3B;


Leg : 74    Top/Bottom Interval(mm):    0/1500  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   522.00
Core:  44   Top of Core Depth (m)  :   519.00
Sect:  2    Top of Section Depth(m):   520.50

LITHOLOGY: PLAG MOD PHYRIC BASALT;

  Piece No.  : PCES 1A (2-17), 2A (19-22), 2B (19-22), 3A (25-29),
               3B (29-38), 4A (39-42), 4B (43-47), 4C (43-47),
               4D (47-50), 5A (52-59), 5B (60-61), 5C (60-61),
               6 (63-69), 7A (72-75), 7B (76-79), 7C (79-82),
               8A (84-96), 8B (96-111), 8C (111-124), 9 (125-129),
               10 (130-143), 11 (145-150);

  Texture    : MOD PHYRIC,MEDIUM-GRAINED,SAME BASALT AS OBSERVED IN
               CORE 44-1;

  Alteration : MOD TO EXT

  Comments   : CONTINUATION OF UNIT 5,MEDIUM-GRAY BASALT;

  Vesicles   : SCATTERED VUGS UP TO 8X4MM LINED OR FILLED WITH
               CARB.UNSPEC OR MINOR PYR;

  Phenocrysts: PLAGIOCLASE

  Replacement: CARBONATE

               CARB.UNSPEC & MINOR PYR FILL VUGS;


Leg : 74    Top/Bottom Interval(mm):    0/1500  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   523.50
Core:  44   Top of Core Depth (m)  :   519.00
Sect:  3    Top of Section Depth(m):   522.00

LITHOLOGY: PLAG MOD PHYRIC BASALT;

  Piece No.  : PCES 1A (0-20), 1B (20-21), 1C (22-32), 1D (32-75),
               1E (76-95), 1F (95-113), 1G (113-123), 1H (123-138),
               1I (138-147);

  Texture    : MOD PHYRIC,MEDIUM-GRAINED,SAME BASALT AS OBSERVED IN
               CORES 44-1 & 44-2;

  Alteration : MOD TO EXT

  Comments   : PCE 1I ENDS UNIT 5,MEDIUM-GRAY BASALT;

  Vesicles   : SCATTERED VUGS WITH CALCITE LINING,PCE 1H HAS TWO
               VUGS WITH CALCITE & CHALPYR(?) LININGS;

  Phenocrysts: PLAGIOCLASE

  Replacement: CALCITE

               CHALCOPYRITE
               CALCITE LINES VUGS,CHALPYR LINES VUGS IN PCE 1H-
               ID CHALPYR UNCERTAIN;


Leg : 74    Top/Bottom Interval(mm):    0/  70  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   528.07
Core:  45   Top of Core Depth (m)  :   528.00
Sect:  1    Top of Section Depth(m):   528.00

LITHOLOGY: SEDIMENT;
           LIMESTONE;

  Piece No.  : PCE 1 (1-6);


Leg : 74    Top/Bottom Interval(mm):   70/1450  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   529.45
Core:  45   Top of Core Depth (m)  :   528.00
Sect:  1    Top of Section Depth(m):   528.07

LITHOLOGY: APHYRIC TO PLAG MOD PHYRIC BASALT;

  Piece No.  : PCES 2A (8-11), 2B (12-15), 2C (15-18), 2D (19-22),
               2E (23-25), 3A (27-29), 3B (30-32), 3C (32-37),
               3D (38-40), 3E (40-44), 4A (46-51), 4B (51-56),
               5A (59-70), 5B (71-77), 5C (78-91), 5D (92-105),
               5E (105-106), 5F (108-113), 5G (114-115),
               6A (118-136), 6B (137-145);

  Texture    : GRADATIONAL FROM APHYRIC TO MOD PHYRIC,FINE-TO-
               MEDIUM-GRAINED;

  Alteration : MOD TO EXT

  Comments   : PCE 2A BEGINS UNIT 6,MEDIUM-GRAY BASALT;

  Vesicles   : Size(mm):    TO 10   Percent:
               Location:            Filling: CARB.UNSPEC
               PCES 2A-4B ARE HIGHLY VESICULAR WITH EMPTY
               VESICLES 1-10MM IN DIAMETER,NUMBER & SIZE OF
               VESICLES DECREASE IN PCES 5A-5G & THEY ARE FILLED
               WITH CARB.UNSPEC;

  Phenocrysts: PLAGIOCLASE

  Replacement: CARBONATE
               CARB.UNSPEC FILLS VESICLES IN PCES 5A-5G;


Leg : 74    Top/Bottom Interval(mm):    0/1500  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   531.00
Core:  45   Top of Core Depth (m)  :   528.00
Sect:  2    Top of Section Depth(m):   529.50

LITHOLOGY: PLAG MOD PHYRIC BASALT;

  Piece No.  : PCES 1A (0-8), 1B (10-22), 1C (20-32), 2 (34-43),
               3A (45-49), 3B (45-50), 4 (52-61), 5A (63-66),
               5B (67-71), 5C (71-75), 6A (80-90), 6B (91-106),
               6C (106-150);

  Texture    : MOD PHYRIC,MEDIUM-GRAINED,SAME BASALT AS IN CORE
               45-1;

  Alteration : MOD TO EXT
               ALTERATION CONSISTS OF SPOTS OF DARK GREEN
               CLAY.MIN & PYR IN GNDMASS & ADJACENT TO SOME
               PHENOS,OL/CPX PHENOS(?) ALTERED TO CLAY.MINS;

  Comments   : CONTINUATION OF UNIT 6,MEDIUM-GRAY BASALT;

  Phenocrysts: PLAGIOCLASE

               OLIVINE

               CLINOPYROXENE
               POSSIBLE OL/CPX PHENOS ALTERED TO GREEN CLAY.MINS
               IN PCES 6B+6C;

  Replacement: CLAY MINERALS
               GREEN CLAY.MINS REPLACES POSSIBLE OL/CPX PHENOS IN
               PCES 6B+6C,GREEN CLAY.MINS ALSO FOUND IN GNDMASS;

               PYR FOUND IN GNDMASS & ADJACENT TO SOME PHENOS;


Leg : 74    Top/Bottom Interval(mm):    0/1500  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   532.50
Core:  45   Top of Core Depth (m)  :   528.00
Sect:  3    Top of Section Depth(m):   531.00

LITHOLOGY: PLAG MOD PHYRIC BASALT;

  Piece No.  : PCES 1A (0-17), 1B (18-25), 1C (26-32), 1D (32-47),
               1E (47-50), 1F (50-64), 1G (64-75), 1H (75-81),
               1I (80-102), 1J (100-133), 1K (134-150);

  Texture    : MOD PHYRIC,MEDIUM-GRAINED,PCE 1D HAS FINE-GRAINED
               LOWER END & POSSIBLY INDICATIVE OF A LOWER CHILLED
               MARGIN,PCE 1E HAS FINE-GRAINED UPPER END-POSSIBLY
               THE START OF ANOTHER COOLING UNIT,SAME BASALT AS IN
               CORES 45-1 & 45-2;

  Alteration : MOD TO EXT
               PCES 1A+1I-1K;
               MOD
               PCES 1B-1H;

  Comments   : CONTINUATION OF UNIT 6,MEDIUM-GRAY BASALT;

  Vesicles   : VESICULAR;

  Phenocrysts: PLAGIOCLASE


Leg : 74    Top/Bottom Interval(mm):    0/ 150  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   532.65
Core:  45   Top of Core Depth (m)  :   528.00
Sect:  4    Top of Section Depth(m):   532.50

LITHOLOGY: PLAG MOD PHYRIC BASALT;

  Piece No.  : PCE 1 (1-15);

  Texture    : MOD PHYRIC,MEDIUM-GRAINED,SAME BASALT AS IN CORES
               45-1 THRU 45-3;

  Alteration : MOD TO EXT

  Comments   : CONTINUATION OF UNIT 6,MEDIUM-GRAY BASALT;

  Phenocrysts: PLAGIOCLASE


Leg : 74    Top/Bottom Interval(mm):    0/1170  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   538.17
Core:  46   Top of Core Depth (m)  :   537.00
Sect:  1    Top of Section Depth(m):   537.00

LITHOLOGY: PLAG MOD PHYRIC BASALT;

  Piece No.  : PCES 1A (0-4), 1B (4-17), 1C (15-30), 1D (28-36),
               1E (37-44), 1F (45-52), 1G (52-60), 1H (60-68),
               1I (67-76), 1J (75-88), 1K (89-108), 1L (108-117);

  Texture    : MOD PHYRIC,MEDIUM-GRAINED,SAME BASALT AS IN CORE 45,
               PCE 1L HAS FINE-GRAINED LOWER END PROBABLY
               REPRESENTING A LOWER CHILLED MARGIN OF THIS UNIT;

  Alteration : MOD

  Comments   : MEDIUM-GRAY BASALT,PCE 1L ENDS UNIT 6;

  Phenocrysts: PLAGIOCLASE


Leg : 74    Top/Bottom Interval(mm): 1170/1500  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   538.50
Core:  46   Top of Core Depth (m)  :   537.00
Sect:  1    Top of Section Depth(m):   538.17

LITHOLOGY: SEDIMENT;


Leg : 74    Top/Bottom Interval(mm):  100/ 200  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   544.45
Core:  46   Top of Core Depth (m)  :   537.00
Sect: CC    Top of Section Depth(m):   544.35

LITHOLOGY: APHYRIC BASALT;

  Piece No.  : PCE NO PCE NUMBER ASSIGNED;

  Texture    : FINE-GRAINED,APHYRIC;

  Alteration : MOD

  Comments   : INTERVAL 10-20 BEGINS UNIT 7,PCE IS MADE UP OF
               SEVERAL FRAGMENTS,MEDIUM-GRAY BASALT;

  Vesicles   : Size(mm):       <1   Percent:
               FEW SMALL EMPTY VESICLES;


Leg : 74    Top/Bottom Interval(mm):    0/1500  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   547.50
Core:  47   Top of Core Depth (m)  :   546.00
Sect:  1    Top of Section Depth(m):   546.00

LITHOLOGY: APHYRIC BASALT;

  Piece No.  : PCES 1 (1-11), 2A (13-17), 2B (17-20), 2C (21-23),
               3A (26-42), 3B (40-52), 3C (52-54), 3D (55-60),
               4 (62-65), 5A (66-74), 5B (74-88), 5C (88-90),
               6 (91-99), 7 (102-109), 8A (112-129), 8B (128-131),
               8C (130-135), 9 (136-150);

  Texture    : APHYRIC,FINE-TO-MEDIUM-GRAINED;

  Structure  : THIN CARB.UNSPEC & PYR STRINGERS IN PCES
               3B+5A-5B+8A,CLAY.MIN VEIN IN PCE 1;

  Alteration : MOD TO EXT

  Comments   : CONTINUATION OF UNIT 7,MEDIUM-GRAY BASALT;

  Vesicles   :
               Location:            Filling: CARB.UNSPEC
               PATCHY VESICULAR,SOME VESICLES EMPTY OTHERS ARE
               FILLED WITH CARB.UNSPEC;

  Replacement: CARBONATE
               CARB.UNSPEC IN STRINGERS IN PCES 3B+5A-5B+8A &
               FILLS SOME VESICLES;

               FOUND IN STRINGERS OF PCES 3B+5A-5B+8A;

               CLAY MINERALS
               CLAY.MIN VEIN IN PCE 1;


Leg : 74    Top/Bottom Interval(mm):    0/1500  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   549.00
Core:  47   Top of Core Depth (m)  :   546.00
Sect:  2    Top of Section Depth(m):   547.50

LITHOLOGY: APHYRIC BASALT;

  Piece No.  : PCES 1A (0-12), 1B (12-17), 1C (17-25), 2A (28-31),
               2B (32-35), 3A (36-42), 3B (42-50), 4 (53-64),
               5A (65-70), 5B (68-89), 5C (88-117), 5D (118-122),
               6A (125-127), 6B (127-150);

  Texture    : APHYRIC,MEDIUM-GRAINED,SAME BASALT AS IN CORE 47-1;

  Structure  : THIN CARB.UNSPEC STRINGERS;

  Alteration : MOD TO EXT

  Comments   : CONTINUATION OF UNIT 7,MEDIUM-GRAY BASALT;

  Vesicles   : PATCHY VESICULAR;

  Replacement: CARBONATE
               CARB.UNSPEC STRINGERS;


Leg : 74    Top/Bottom Interval(mm):    0/ 450  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   549.45
Core:  47   Top of Core Depth (m)  :   546.00
Sect:  3    Top of Section Depth(m):   549.00

LITHOLOGY: APHYRIC BASALT;

  Piece No.  : PCES 1A (0-7), 1B (5-11), 1C (10-31), 1D (31-44);

  Texture    : APHYRIC,MEDIUM-GRAINED;

  Alteration : MOD TO EXT

  Comments   : MEDIUM GRAY BASALT,PCE 1D ENDS UNIT 7;


Leg : 74    Top/Bottom Interval(mm):  450/1150  Analyst: Richardson, S.H.
Hole: 528   Sample Midpoint (m)    :   550.15
Core:  47   Top of Core Depth (m)  :   546.00
Sect:  3    Top of Section Depth(m):   549.45

LITHOLOGY: PLAG SPARSELY PHYRIC BASALT;

  Piece No.  : PCES 2A (45-48), 2B (48-54), 3A (58-66), 3B (67-80),
               3C (80-89), 4 (91-104), 5 (105-112);

  Texture    : SPARSELY PHYRIC,MEDIUM-GRAINED,PCES 2A-2B HAVE VERY
               FINE-GRAINED MARGINS;

  Alteration : MOD TO EXT

  Comments   : PCES 2A-5 COMPRISE UNIT 8,PCE 5 MARKS END OF HOLE,
               MEDIUM-GRAY BASALT,PCE 4 IS DRILLING RUBBLE;

  Vesicles   : Size(mm):     TO 8   Percent:
               PCES 2A-2B HAVE A FEW LARGE VESICLES 8X4MM;

  Phenocrysts: PLAGIOCLASE
               SPARSE;


    

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.

Department of Commerce > NOAA > NESDIS > NCEI > doi:10.7289/V54M92G2