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Core Data from the Deep Sea Drilling Project


Leg : 31    Top/Bottom Interval(mm):  750/1380  Analyst: MacGregor, I.
Hole: 293   Sample Midpoint (m)    :   517.38
Core:  18   Top of Core Depth (m)  :   516.00
Sect:  1    Top of Section Depth(m):   516.75

LITHOLOGY: BASALT;

  Piece No.  : PCES 1 (76-87), 2 (87-101), 3A (101-108),
               3B (101-108), 4 (108-116), 5 (116-125),
               6 (125-133), 7 (133-137);

  Comments   : DARK GREENISH GREY (5G 6/1);


Leg : 31    Top/Bottom Interval(mm): 1000/1500  Analyst: MacGregor, I.
Hole: 293   Sample Midpoint (m)    :   522.50
Core:  19   Top of Core Depth (m)  :   521.00
Sect:  1    Top of Section Depth(m):   522.00

LITHOLOGY: BASALT;

  Piece No.  : BASALT BRECCIA;
               PCES 1 (100-119), 2 (120-126), 3 (128-135),
               4 (133-137), 5 (137-141), 6 (141-150);

  Texture    : BRECCIA COMPOSED TO ANGULAR TO SUBANGULAR BASALT
               FRAGMENTS FROM 1-5 MM IN SIZE FLOATING IN FINE
               GRAINED GREYISH ORANGE MATRIX, MATRIX CONTAINS
               ANOTHER POPULATION OF FRAGMENTS 1 T0 10 MM IN SIZE,
               MATRIX IS A SILTY CLAY OF CLAY MINERALS +
               FERRUGINOUS MATERIAL AND VERY PALE GREEN AMPHIBOLE
               WITH MINOR FELDSPAR + LITHIC FRAGMENTS AND
               ZEOLITES;

  Groundmass : FELDSPAR

  Replacement: CLAY MINERALS

               OTHER
               FERRUGINOUS MATERIAL;

               AMPHIBOLE

               ZEOLITE
               MATRIX IS A SILTY CLAY OF CLAY MINERALS +
               FERRUGINOUS MATERIAL + VERY PALE GREEN AMPHIBOLE
               WITH MINOR FELDSPAR + LITHIC FRAGMENTS + ZEOLITES;


Leg : 31    Top/Bottom Interval(mm):    0/1500  Analyst: MacGregor, I.
Hole: 293   Sample Midpoint (m)    :   527.00
Core:  20   Top of Core Depth (m)  :   525.50
Sect:  1    Top of Section Depth(m):   525.50

LITHOLOGY: BASALT;
           BRECCIA;

  Piece No.  : PCES 1 (0-5), 2 (5-20), 3 (20-26), 4 (25-36),
               5 (36-45), 6 (45-53), 7 (53-61), 8A (61-63),
               8B (63-66), 9 (61-69), 10 (69-74), 11 (74-84),
               12 (84-89), 13 (89-96), 14 (96-103), 15 (103-117),
               16 (117-127), 17 (127-134), 18 (134-144),
               19 (144-149);

  Texture    : FROM 0-25 CM BRECCIA OF ANGULAR TO SUBANGULAR
               BASALT FRAGMENTS  WITH SOME AT LEAST 10 CM IN
               LENGTH - EQUIVALENT TO BRECCIA IN CORE 19 SECTION 1,
               FROM 25-61 CM CLASTS (2-4 CM) ANGULAR TO SUBANGULAR
               SET IN FINE GRAINED MATRIX - CLASTS ARE FREE
               FLOATING - MATRIX APPEARS BIMODAL WITH GRAINS
               0.2 TO 0.8 CM IN FINE SILTY CLAY MATRIX WHICH IS
               MODERATE REDDISH BROWN IN COLOR (10 R 4/6) - CLASTS
               COMPOSED OF ANGULAR BASALT FRAGMENTS AND A FEW
               MICROGABBROS, FROM 61-145 CM CLASTS (4-15 CM) OF
               ANORTHOSITIC GABBRO SET IN FINE GRAINED + LIGHT
               GREENISH GREY MATRIX + CLASTS ARE FREE FLOATING AND
               MATRIX ALSO APPEARS TO BE BIMODAL IN GRAIN SIZE,
               FROM 145-150 CM SMALL FRAGMENTS OF GREENISH GREY
               (5GY 6/1) BASALT;

  Comments   : FOUR UNITS IN CORE (0-25 CM) + (25-61 CM) +
               (61-145 CM) + (145-150 CM), FROM 25-61 CM FINE SILTY
               CLAY MATRIX WHICH IS MODERATE REDDISH BROWN IN
               COLOR (10 R 4/6), IN 145-150 CM SMALL FRAGMENT OF
               GREENISH GREY (5 GY 6/1) BASALT;

  Groundmass : MATRIX
               FOR DESCRIPTION OF MATRIX AND ITS CONTENTS
               SEE TEXTURE;


Leg : 31    Top/Bottom Interval(mm):    0/ 910  Analyst: MacGregor, I.
Hole: 293   Sample Midpoint (m)    :   535.91
Core:  21   Top of Core Depth (m)  :   535.00
Sect:  1    Top of Section Depth(m):   535.00

LITHOLOGY: BRECCIA;
           GABBRO;

  Piece No.  : PCES 1 (0-16), 2 (15-25), 3 (25-30), 4 (30-40),
               5 (40-44), 6 (44-51), 7 (51-56), 8 (56-62),
               9 (62-66), 10 (66-70), 11 (72-79), 12 (79-84),
               13 (86-91);

  Texture    : LARGE (UP TO 13 CM) CLASTS OF GABBRO AND
               ANORTHOSITIC GABBRO (ANGULAR TO SUBANGULAR) FLOATING
               IN FINE GRAINED GROUNDMASS WHICH IS COMPOSED OF
               BIMODAL GRAIN SIZE;

  Comments   : MATRIX OF PALE YELLOWISH ORANGE, REFER TO THE
               INITIAL REPORTS FOR ADDITIONAL INFORMATION ON
               SITE 293 LITHOLOGY;


Leg : 31    Top/Bottom Interval(mm):    0/1500  Analyst: MacGregor, I.
Hole: 293   Sample Midpoint (m)    :   538.00
Core:  21   Top of Core Depth (m)  :   535.00
Sect:  2    Top of Section Depth(m):   536.50

LITHOLOGY: GABRRO;;
           BRECCIA;

  Piece No.  : PCES 1 (0-9), 2 (9-19), 3 (19-34), 4 (36-46),
               5 (46-51), 6 (51-59), 7 (60-71), 8 (71-82),
               9 (82-97), 10 (97-112), 11 (112-120), 12 (120-126),
               13 (126-138), 14 (138-149);

  Texture    : 0-40CM:  COARSE-GRAINED GABBRO CLASTS (1-15CM) IN
               DARK YELLOWISH ORANGE (10YR 6/0) MATRIX, CLASTS ARE
               ANGULAR & FLOAT IN MATRIX,MATRIX IS BIMODAL;
               40-80CM:  FINER-GRAINED GABBRO CLASTS (1-3CM) IN
               DARK YELLOWISH ORANGE MATRIX;
               80-89CM:  MATRIX NOW GREYISH BROWN (5YR 3/2) -CLASTS
               VERY FINE-GRAINED GABBRO;
               89-150CM:  GABBRO CLASTS (1-5CM) IN LIGHT
               GREENISH GREY (5GY 8/1) MATRIX, CLASTS ARE
               ANGULAR TO SUBANGULAR-MATRIX BIMODAL;

  Comments   : FROM 0-40 CM DARK YELLOWISH ORANGE (10 YR 6/6)
               MATRIX, FROM 40-80 CM HAS DARK YELLOWISH ORANGE
               MATRIX, FROM 80-89 CM MATRIX NOW GREYISH BROWN
               (5YR 3/2), FROM 89-150 CM MATRIX IS LIGHT GREENISH
               GREY (5 GY 8/1), REFER TO INITIAL REPORTS FOR
               ADDITIONAL INFORMATION ON LITHOLOGY FOR SITE 293;

  Groundmass : FELDSPAR

               PYROXENE
               FELDSPAR AND PYX IN MATRIX OF PCE 10, SEE TEXTURE
               FOR ADDITIONAL INFORMATION ON GROUNDMASS;


    

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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