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 : 60    Top/Bottom Interval(mm):   90/ 130  Describer: Meijer, A.
Hole: 458   Top of Core Depth(m)   :   256.50   Rock Type: IGNEOUS
Core:  28   Sample Midpoint(m)     :   256.61   Sect/Pc #:  1/PCE 2

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: HYALOPILITIC;
       Where sampled: NEXT TO GLASSY MARGIN

Phenocrysts- CLINOPYROXENE             (    6%)
             Size(mm):    0.1-1.0  Morphology: EUHEDRAL,STUBBY
             UNALTERED MICROPHENOCRYSTS;

             ORTHOPYROXENE             (    1%)
             Size(mm):    0.1-1.0
             INTERGROWN WITHIN THE CPX XTLS*

Groundmass - GLASS                     (   43%)
             QUENCHED TO GLASS,PYX + ORE + PLAG,
             R.I. OF GLASS LEQ BALSAM;

             CLINOPYROXENE             (   10%)
             Size(mm):  0.004-0.1  Morphology: STUBBY TO EUHEDRAL
             UNALTERED*

Alteration - CLAY MINERALS             (   10%)
             Location: AROUND         Replacing: GLASS
             Location: VESICLES
             PERCENT LISTED AS PART OF GLASS;

             ZEOLITE                   (    1%)
             Location: VESICLES       Replacing: PLAG IN PART
             ZEOL FILLS VESICLE IN SLIDE*

Vesicles   -
             Size(mm):  0.5-2.0
             Percent:    40
             Location: DISPERSED
             Filling: ZEOLITES
             Shape: IRREGULAR




Leg : 60    Top/Bottom Interval(mm):  640/ 670  Describer: Meijer, A.
Hole: 458   Top of Core Depth(m)   :   256.50   Rock Type: IGNEOUS
Core:  28   Sample Midpoint(m)     :   257.16   Sect/Pc #:  1/PCE 9

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: HYALOPILITIC-INTERSERTAL*

Phenocrysts- CLINOPYROXENE             (    2%)
             Size(mm):    0.2-0.5  Morphology: PRISMATIC TO EUHEDRAL
             SOME STRAIN SHADOWS,REGULAR AND CASTELATE (SIC)
             TWINNING*

Groundmass - GLASS                     (   28%)
             QUENCH TEXTURE,CPX + PLAG + BROWN GLASS,NO FE-TI
             OXIDES;

             CLINOPYROXENE             (   20%)
             Size(mm):   0.02-0.2  Morphology: PRISMATIC TO SKELETAL

Alteration - CLAY MINERALS             (  7-8%)
             Location: LINING         Replacing: GLASS
             Location: VESICLES

Vesicles   -
             Size(mm):  0.5-1.0
             Percent:    50
             Location: DISPERSED
             Filling: SOME CLAYS
             Shape: IRREGULAR




Leg : 60    Top/Bottom Interval(mm): 1110/1140  Describer: Meijer, A.
Hole: 458   Top of Core Depth(m)   :   256.50   Rock Type: IGNEOUS
Core:  28   Sample Midpoint(m)     :   257.63   Sect/Pc #:  1/PCE 14

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: INTERSERTAL TO VARIOLITIC OR SPHERULITIC*

Phenocrysts- CLINOPYROXENE             (    4%)
             Size(mm):    0.5-1.0
             SOME PHENOS HAVE IRREGULAR BLOCKY TWINNING,SOME
             PHENOS DO NOT GO EXTINCT,MOST ARE RIDDLED WITH
             INCLUSION PITS;

             ORTHOPYROXENE             (    1%)
             Size(mm):    0.5-0.8
             RIMMED WITH CPX*

Groundmass - CLINOPYROXENE             (   19%)
             Size(mm):      0.1-1  Morphology: BLOCKY TO PRISMATIC

             PLAGIOCLASE               (   10%)
             Size(mm):      0.1-1  Morphology: SKELETAL
             PARTLY ALTERED TO ZEOLITE(?),ALSO INCLUDES GLASS;

             GLASS                     (   12%)
             DEVITRIFIED TO FRESH-PALE BROWN;

             MAGNETITE                 (    1%)

Alteration - CLAY MINERALS             (    3%)
             Location: INTERSTITIAL   Replacing: GLASS

             ZEOLITE                   (    3%)
             Location: LINING
             Location: VESICLES

Vesicles   -
             Percent:    50




Leg : 60    Top/Bottom Interval(mm): 1300/1330  Describer: Meijer, A.
Hole: 458   Top of Core Depth(m)   :   256.50   Rock Type: IGNEOUS
Core:  28   Sample Midpoint(m)     :   257.82   Sect/Pc #:  1/PCE 16

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: QUENCH OR SPHERULITIC*

Phenocrysts- CLINOPYROXENE             (    5%)
             Size(mm):    0.2-0.6  Morphology: BLOCKY TO PRISMATIC
             INCLUDES SOME OPX RIMMED BY CPX-<1%*

Groundmass - GLASS                     (   30%)
             BROWN,DEVITRIFIED;

             PLAGIOCLASE               (   10%)
             Size(mm):    0.1-1.0  Morphology: SKELETAL TO ACICULAR
             PLAG IS FIBROUS SPHERULITIC;

             CLINOPYROXENE             (    7%)
             Size(mm):   0.01-0.2  Morphology: CHUNKY TO PRISMATIC

             MAGNETITE                 (    2%)
             Size(mm):  0.01-0.02
             OXIDIZED IN PART*

Alteration - CLAY MINERALS             (   10%)
             Location: LINE VESICLES  Replacing: GLASS
             Location: AND ALONG
             Location: FRACTURES
             INCIPIENT,RADIAL PHILLIPSITE IN ALTERED ZONE;

             HEMATITE                  (    2%)
             Location: EXTERIOR
             Location: SURFACE

Vesicles   -
             Size(mm):  0.2-0.5
             Percent:    45
             Location: NEAREST GLASS
             Filling: LINED WITH CLAY
             Shape: IRREGULAR
             SOME ABOUT 1MM,ONE TEAR-DROP SHAPED*




Leg : 60    Top/Bottom Interval(mm): 1420/1460  Describer: Meijer, A.
Hole: 458   Top of Core Depth(m)   :   256.50   Rock Type: IGNEOUS
Core:  28   Sample Midpoint(m)     :   257.94   Sect/Pc #:  1/PCE 18

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: HYALOPILITIC*

Phenocrysts- CLINOPYROXENE             (   10%)
             Size(mm):    0.2-1.0  Morphology: TABULAR TO ANHEDRAL
             SOME INTERPENETRATION TWINS;

             ORTHOPYROXENE             (    2%)
             Size(mm):    0.2-1.0  Morphology: TABULAR
             RIMMED BY CPX*

Groundmass - GLASS                     (   38%)

             CLINOPYROXENE             (   35%)
             Size(mm):   0.05-0.3  Morphology: EUHEDRAL TO PRISMATIC
             FLOW TEXTURED;

             ORTHOPYROXENE             (    3%)
             Size(mm):   0.05-0.2  Morphology: EUHEDRAL TO PRISMATIC

             PLAGIOCLASE               (    2%)

Alteration - CLAY MINERALS             (    2%)
             Location: LINE VESICLES

Vesicles   -
             Size(mm):  0.2-2.0
             Percent:    10
             Location: RANDOM
             Filling: CLAY.MINS
             Shape: ROUND TO

             Shape: IRREGULAR
             IRREGULAR SHAPE IN VARIOLITES*




Leg : 60    Top/Bottom Interval(mm):   10/  30  Describer: Meijer, A.
Hole: 458   Top of Core Depth(m)   :   266.00   Rock Type: IGNEOUS
Core:  29   Sample Midpoint(m)     :   266.02   Sect/Pc #:  1/PCE 1

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: INTERSERTAL TO HYALOPILITIC
       THINNER PORTIONS ARE HYALOPILITIC;
       Where sampled: NEXT TO GLASSY MARGIN*

Phenocrysts- CLINOPYROXENE             (    4%)
             Size(mm):    0.1-1.0  Morphology: EUHEDRAL TO TABULAR

             ORTHOPYROXENE             (    1%)
             Size(mm):    0.1-1.0  Morphology: TABULAR

Groundmass - CLINOPYROXENE             (   30%)
             Size(mm):   0.02-0.1  Morphology: EUHEDRAL-ACICULAR-TABULAR
             CHRISTMAS TREE FORMS;

             GLASS                     (   25%)
             CLEAR TO BROWN WITH VAPOR INCLUSIONS(?)*

Alteration - CLAY MINERALS             (    5%)
             Location: EXTERIOR       Replacing: GLASS
             Location: SURFACE AND
             Location: LINE VESICLES

             ZEOLITE                   (    1%)
             Location: GROUNDMASS     Replacing: GLASS

Vesicles   -
             Size(mm):  0.5-3.0
             Percent:    40
             Filling: NONE
             Shape: OBLONG TO

             Shape: ROUND




Leg : 60    Top/Bottom Interval(mm):  540/ 570  Describer: Meijer, A.
Hole: 458   Top of Core Depth(m)   :   266.00   Rock Type: IGNEOUS
Core:  29   Sample Midpoint(m)     :   266.56   Sect/Pc #:  1/PCE 10

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: VARIOLITIC*

Phenocrysts- CLINOPYROXENE             (    3%)
             Size(mm):    0.2-1.0  Morphology: EUHEDRAL TO TABULAR
             FAIRLY FRESH*

Groundmass - PLAGIOCLASE               (   35%)
             Morphology: SKELETAL TO QUENCH
             PARTLY ALTERED;

             GLASS                     (   15%)
             DEVITRIFIED,UP TO 13% ADDITIONAL GLASS ALTERED
             TO CLAYS;

             CLINOPYROXENE             (   10%)
             Morphology: EUHEDRAL TO ANHEDRAL
             PARTLY ALTERED;

             MAGNETITE                 (    4%)
             Morphology: ANHEDRAL

Alteration - CLAY MINERALS             (   13%)
             Location: THROUGHOUT     Replacing: GLASS + LINE VESICLES
             POSSIBLY REPLACING OPX(?) + PLAG + OL(?)*

Vesicles   -
             Size(mm):  0.1-1.0
             Percent:    20
             Location: THROUGHOUT
             Filling: NONE
             Shape: IRREGULAR




Leg : 60    Top/Bottom Interval(mm):  920/ 950  Describer: Meijer, A.
Hole: 458   Top of Core Depth(m)   :   266.00   Rock Type: IGNEOUS
Core:  29   Sample Midpoint(m)     :   266.93   Sect/Pc #:  1/PCE 16

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: VARIOLITIC*

Phenocrysts- CLINOPYROXENE             (    4%)
             Size(mm):    0.1-0.5  Morphology: EUHEDRAL TO LATHLIKE
             PARTLY ALTERED TO CLAY*

Groundmass - GLASS
             IDENTITY OF GLASS TOTALLY UNCERTAIN,OBSERVER
             INDICATES NO GLASS IN THIN SECTION-ICD STATES IT
             IS THE SAME AS PREVIOUS SECTION 54-57 WHICH HAS
             25-28% GLASS;

             PLAGIOCLASE               (   20%)
             Size(mm):    0.1-0.5  Morphology: SKELETAL,TABULAR,DENDRITIC
             PARTLY ALTERED TO CLAYS;

             CLINOPYROXENE             (    5%)
             Size(mm):    0.1-0.2  Morphology: EUHEDRAL TO SKELETAL
             PARTLY ALTERED TO CLAYS;

             MAGNETITE                 (    2%)
             Size(mm):  0.01-0.02  Morphology: SUBHEDRAL

Alteration - CLAY MINERALS             (   25%)
             Location: THROUGHOUT     Replacing: GLASS + CPX + PLAG + LINES
             Replacing: VESICLES

             ZEOLITE                   (    2%)

Vesicles   -
             Percent:    40




Leg : 60    Top/Bottom Interval(mm):  380/ 400  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   266.00   Rock Type: IGNEOUS
Core:  29   Sample Midpoint(m)     :   267.89   Sect/Pc #:  2/PCE 5

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: INTERSERTAL;
       Where sampled: PILLOW INTERIOR
       AREA UNCERTAIN*

Phenocrysts- CLINOPYROXENE             (   TR%)
             Size(mm):    0.5-1.0

Groundmass - GLASS                     (35-40%)
             DEVITRIFIED BY ALTERATION;

             CLINOPYROXENE             (   15%)
             Size(mm):    0.3-1.0  Morphology: PRISMATIC TO GRANULAR

             PLAGIOCLASE               (   10%)
             Size(mm):    0.1X1.0  Morphology: SKELETAL TO ELONGATE
             CORES OF CPX(?) OR GLASS(?);

             PLAGIOCLASE
             Size(mm):    0.3X0.3  Morphology: SUBHEDRAL
             THE OTHER PLAG XTLS ENCLOSE THESE;

             MAGNETITE
             Size(mm):  0.01-0.05  Morphology: SKELETAL

Alteration - CLAY MINERALS             (   40%)
             Replacing: GLASS
             UGLY GREENISH BROWN COLOR*

Vesicles   -
             Size(mm):  0.1-0.5
             Percent:    10
             Location: DISPERSED
             Filling: CLAY-LINED
             Shape: IRREGULAR




Leg : 60    Top/Bottom Interval(mm):  390/ 420  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   266.00   Rock Type: IGNEOUS
Core:  29   Sample Midpoint(m)     :   267.91   Sect/Pc #:  2/PCE 6

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: INTERSERTAL;
       Where sampled: PILLOW INTERIOR
       AREA UNCERTAIN*

Phenocrysts- CLINOPYROXENE             (   <1%)
             Size(mm):    0.5-1.0  Morphology: GRANULAR
             VERY RARE;

             OLIVINE                   (    0%)

Groundmass - PLAGIOCLASE               (   20%)
             Size(mm):     TO 0.5  Morphology: SKELETAL,ELONGATE,DENDRITIC

             Morphology: PROJECTIONS

             GLASS                     (   20%)
             TOTALLY ALTERED TO CLAYS;

             CLINOPYROXENE             (   15%)
             Size(mm):     TO 0.1  Morphology: GRANULAR,PRISMATIC

             ORTHOPYROXENE             (    5%)

Alteration - CLAY MINERALS             (   20%)
             Replacing: GLASS
             CLAYS ARE GREEN TO BROWN*

Vesicles   -
             Size(mm):  0.2-0.5
             Percent:    40
             Location: DISPERSED
             Filling: PARTIAL CLAYS
             Shape: IRREGULAR




Leg : 60    Top/Bottom Interval(mm):  480/ 490  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   266.00   Rock Type: IGNEOUS
Core:  29   Sample Midpoint(m)     :   267.99   Sect/Pc #:  2/PCE 6

ROCK = HIGH MG BRONZITE ANDESITE
       THIN SECTION IS SMALL;
       Texture: INTERSERTAL;
       Where sampled: PILLOW INTERIOR - FLOW INTERIOR
       AREA UNCERTAIN*

Phenocrysts- CLINOPYROXENE             (   TR%)

Groundmass - GLASS                     (   30%)
             TOTALLY ALTERED TO CLAYS,BROWN-GREEN COLOR;

             PLAGIOCLASE               (   25%)
             Size(mm):     TO 0.5  Morphology: SKELETAL TO ELONGATE

             CLINOPYROXENE             (   20%)
             Size(mm):   0.05-0.3  Morphology: GRANULAR,PRISMATIC,SKELETAL,

             Morphology: DENDRITIC,SOME BLOCKY CHUNKS

             ORTHOPYROXENE             (    5%)

             MAGNETITE                 (   TR%)
             Size(mm):      <0.01  Morphology: SKELETAL

             QUARTZ                    (   TR%)
             IDENTITY UNCERTAIN,OPTIC FIGURE CLOSE BUT SOMEWHAT
             OFF CENTER*

Alteration - CLAY MINERALS             (   30%)
             Location: DISPERSED      Replacing: GLASS

Vesicles   -
             Size(mm):  0.5-1.0
             Percent:    20
             Location: DISPERSED
             Filling: MINOR CLAY
             Shape: IRREGULAR

             Filling: LINING




Leg : 60    Top/Bottom Interval(mm):  500/ 540  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   275.50   Rock Type: IGNEOUS
Core:  30   Sample Midpoint(m)     :   276.02   Sect/Pc #:  1/PCE 8

ROCK = BRONZITE ANDESITE;
       Texture: HYALOPILITIC WITH INCIPIENT VARIOLITES*

Phenocrysts- CLINOPYROXENE             (    2%)
             Size(mm):    0.2-0.5  Morphology: SKELETAL TO DENDRITIC
             ACTUALLY JUST LARGER XTLS IN CONTINUUM;

             ORTHOPYROXENE             (   TR%)
             IDENTITY UNCERTAIN,ENCLOSED WITHIN LARGER CPX
             XTLS,NO PARALLEL EXTINCTION*

Groundmass - GLASS                     (   53%)
             LOCALLY ALTERED TO ZEOLITES;

             CLINOPYROXENE             (   40%)
             Size(mm):   0.03-0.2  Morphology: SKELETAL,MICROLITIC
             SOME COALESCING HETEROGENEOUSLY;

             PLAGIOCLASE               (    0%)

             OPAQUE MINERALS           (    0%)

Alteration - ZEOLITE                   (   10%)
             Replacing: GLASS

Vesicles   -
             Size(mm): 0.15-1.0
             Percent:     5
             Location: RANDOM
             Filling: NONE
             SMALL THIN SECTION-ONLY FOUR OR FIVE PRESENT*




Leg : 60    Top/Bottom Interval(mm): 1000/1040  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   275.50   Rock Type: IGNEOUS
Core:  30   Sample Midpoint(m)     :   276.52   Sect/Pc #:  1/PCE 16

ROCK = BRONZITE ANDESITE;
       Texture: HYALOPILITIC;
       Where sampled: GLASSY MARGIN*

Phenocrysts- ORTHOPYROXENE             (   <1%)
             Size(mm):    0.5-1.0
             3 INTERGROWN XTLS,HAS SKELETAL INTERIOR HOLES*

Groundmass - GLASS                     (   64%)
             MOSTLY ALTERED TO CLAY;

             CLINOPYROXENE             (   30%)
             Size(mm):    0.1-1.0  Morphology: SKELETAL-ELONGATE MICROLITES
             LARGER ONES SHOW FLUIDAL ALIGNMENT*

Alteration - ZEOLITE
             Location: CRACK ACROSS
             Location: THIN SECTION
             GLASS IS BROWN NEXT TO CRACK,ZEOLITES ARE 0.5MM-
             2.0CM*

Vesicles   -
             Size(mm):  1.0-2.0
             Percent:     5
             Location: RANDOM
             Filling: CLAY-LINED THEN
             Shape: IRREGULAR-

             Filling: FILLED WITH
             Shape: FLATTENED

             Filling: ZEOLITES




Leg : 60    Top/Bottom Interval(mm):  710/ 730  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   275.50   Rock Type: IGNEOUS
Core:  30   Sample Midpoint(m)     :   277.72   Sect/Pc #:  2/PCE 10

ROCK = BRONZITE ANDESITE;
       Texture: INTERSERTAL*

Phenocrysts- CLINOPYROXENE             (   TR%)
             Size(mm):        1.0

Groundmass - PLAGIOCLASE               (   25%)
             Size(mm):    0.2-0.5  Morphology: SKELETAL TO DENDRITIC
             ELONGATE WITH CENTERED INCLUSIONS;

             CLINOPYROXENE             (   13%)
             Size(mm):    0.1-0.8  Morphology: GRANULAR,PRISMATIC,SKELETAL
             GOES TO MORE SKELETAL AS SIZE DECREASES;

             GLASS                     (   10%)
             ALTERED TO CLAYS;

             ORTHOPYROXENE             (    2%)
             RARER THAN IN HIGHER BASALTS-CORES 28-29;

             MAGNETITE                 (   TR%)
             Size(mm):  0.01-0.05  Morphology: SKELETAL TO SINGLE XTLS

Alteration - CLAY MINERALS             ( 5-10%)
             Replacing: GLASS
             PERVASIVE*

Vesicles   -
             Size(mm):  0.3-1.0
             Percent:    50
             Location: THROUGHOUT




Leg : 60    Top/Bottom Interval(mm): 1000/1040  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   275.50   Rock Type: SEDIMENTARY
Core:  30   Sample Midpoint(m)     :   278.02   Sect/Pc #:  2/PCE 15

ROCK = LIMESTONE WITH GLASS FRAGMENTS
       OBSERVER CALLS THIS A LIMESTONE WITH VESICULAR
       ALTERED VOLCANIC (GLASS) FRAGMENTS;
       Texture: RECRYSTALLIZED
       VERY FINE,NO MICROFOSSILS,SOME MICRITE IN
       CAVITIES*

Groundmass - GLASS                     (   25%)
             TOTALLY ALTERED TO CLAYS;

             PLAGIOCLASE               (   15%)
             Morphology: SPHERULITIC NEEDLES

             CLINOPYROXENE             (   10%)
             Morphology: MICROLITES

             MAGNETITE                 (   TR%)

Alteration - CLAY MINERALS             (   25%)
             Location: LINE VESICLES  Replacing: GLASS
             PERVASIVE,CHARTREUSE COLOR*

Vesicles   -
             Size(mm):  0.1-0.4
             Percent:    50
             Location: THROUGHOUT
             Filling: CLAY-LINED
             Shape: IRREGULAR




Leg : 60    Top/Bottom Interval(mm):   20/  70  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   285.00   Rock Type: IGNEOUS
Core:  31   Sample Midpoint(m)     :   285.05   Sect/Pc #:  1/PCE 1

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: SUBOPHITIC,INTERSERTAL PATCHES;
       Where sampled: FLOW INTERIOR*

Groundmass - GLASS                     (   30%)
             DEVITRIFIED BY ALTERATION TO CLAYS;

             PLAGIOCLASE               (   25%)
             Size(mm):    0.1-0.5  Morphology: ELONGATE,TWINNED PRISMS
             APPROX COMP AN76-60 BY CARLSBAD-ALBITE METHOD,
             2VX WITH LARGE V,TWO TYPES OF PLAG-EUHEDRAL
             AND ANHEDRAL;

             CLINOPYROXENE             (   25%)
             Size(mm):    0.1-0.5  Morphology: PRISMATIC-SKELETAL

             ORTHOPYROXENE             (    2%)

             ILMENITE                  (    1%)
             Morphology: SKELETAL-GRANULAR

             MAGNETITE                 (   <1%)
             Morphology: SKELETAL,EQUANT

             HEMATITE                  (   TR%)

Alteration - CLAY MINERALS             (   15%)
             Replacing: GLASS

             HEMATITE                  (   TR%)

Vesicles   -
             Percent:    10




Leg : 60    Top/Bottom Interval(mm): 1270/1290  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   285.00   Rock Type: IGNEOUS
Core:  31   Sample Midpoint(m)     :   286.28   Sect/Pc #:  1/PCE 18

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: SUBOPHITIC,INTERSERTAL
       LOCALLY INTERSERTAL NEAR VESICLES;
       Where sampled: FLOW INTERIOR*

Groundmass - PLAGIOCLASE               (   35%)
             Size(mm):    0.1-0.3  Morphology: EQUANT-TABULAR
             TWO TYPES OF INTERSTITIAL PLAG-EUHEDRAL AND
             ANHEDRAL;

             CLINOPYROXENE             (   23%)
             Size(mm):   0.05-0.3  Morphology: GRANULAR-PRISMATIC

             GLASS                     (   20%)
             ALTERED TO CLAYS;

             ORTHOPYROXENE             (    2%)

             MAGNETITE                 (   TR%)
             Size(mm):  0.01-0.05  Morphology: GRANULAR-SKELETAL

Alteration - CLAY MINERALS             (   20%)
             Location: DISPERSED      Replacing: GLASS

Vesicles   -
             Size(mm):  0.2-1.5
             Percent:    20
             Location: DISPERSED
             Filling: NONE
             Shape: IRREGULAR-

             Shape: ROUND
             TWO SIZES-SMALLER(15%) ARE 0.2MM-0.5MM AND ARE
             IRREGULAR,LARGER(5%) ARE 1.0MM-1.5MM AND ROUND*




Leg : 60    Top/Bottom Interval(mm): 1300/1310  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   285.00   Rock Type: IGNEOUS
Core:  31   Sample Midpoint(m)     :   286.31   Sect/Pc #:  1/PCE 19

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: SUBOPHITIC;
       Where sampled: FLOW INTERIOR*

Groundmass - PLAGIOCLASE               (   40%)
             Size(mm):    0.1-0.5  Morphology: TABULAR,EUHEDRAL,ANHEDRAL
             AS IN PREVIOUS SECTIONS HAS TWO TYPES OF PLAG-
             EUHEDRAL AND ANHEDRAL;

             CLINOPYROXENE             (   30%)
             Size(mm):    0.1-0.5  Morphology: TABULAR,EUHEDRAL
             SOME LARGER ONES HAVE INCLUSIONS;

             GLASS                     (   15%)
             TOTALLY ALTERED TO CLAYS;

             ORTHOPYROXENE             (    2%)

             MAGNETITE                 (    1%)
             Size(mm):  0.01-0.03  Morphology: EUHEDRAL,CUBIC

Alteration - CLAY MINERALS             (   15%)
             Replacing: GLASS
             CHARTREUSE COLOR*

Vesicles   -
             Size(mm):  0.2-1.0
             Percent:    12
             Location: SCATTERED
             Filling: NONE
             Shape: IRREGULAR
             SMALLER MORE ABUNDANT ON ONE SIDE OF SECTION*




Leg : 60    Top/Bottom Interval(mm): 1300/1350  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   285.00   Rock Type: IGNEOUS
Core:  31   Sample Midpoint(m)     :   286.33   Sect/Pc #:  1/PCE 19

ROCK = HIGH MG BRONZITE ANDESITE
       SAMPLE TAKEN FROM NEAR A LARGE VESICLE;
       Texture: SUBOPHITIC,SPHERULITIC
       MATERIAL NEAR LARGE VESICLE MORE SPHERULITIC*

Groundmass - PLAGIOCLASE               (   39%)
             Size(mm):    0.1-0.5  Morphology: TABULAR-EUHEDRAL
             TWO TYPES OF PLAG IN THREE TO ONE PROPORTIONS OF
             EUHEDRAL TO ANHEDRAL;

             CLINOPYROXENE             (   34%)
             Size(mm):    0.1-0.7  Morphology: EUHEDRAL,TABULAR-SKELETAL

             GLASS                     (   15%)
             ALTERED TO CLAYS;

             MAGNETITE                 (    1%)
             Size(mm):  0.01-0.06  Morphology: EUHEDRAL,CUBIC-BLOCKY

             ORTHOPYROXENE             (    1%)
             2VZ = 95,ENSTATITE*

Alteration - CLAY MINERALS             (   15%)
             Replacing: GLASS

Vesicles   -
             Percent:    10




Leg : 60    Top/Bottom Interval(mm):  810/ 830  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   294.50   Rock Type: IGNEOUS
Core:  32   Sample Midpoint(m)     :   295.32   Sect/Pc #:  1/PCE 6

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: SUBOPHITIC*

Groundmass - PLAGIOCLASE               (   40%)
             Size(mm):    0.2-1.0  Morphology: ELONGATE LATHS
             LATHS ARE TWINNED LENGTHWISE;

             CLINOPYROXENE             (   32%)
             Size(mm):    0.2-0.8  Morphology: PRISMATIC,MICROLITIC-SKELETAL

             GLASS                     (   15%)
             CONTAINS NEEDLE-LIKE PLAG SPHERULITES,PARTLY
             ALTERED TO CLAYS;

             MAGNETITE                 (    2%)
             Size(mm):  0.01-0.03  Morphology: EQUANT,CUBIC,BLOCKY

             ORTHOPYROXENE             (    1%)

Alteration - CLAY MINERALS             (   <5%)
             Replacing: GLASS

Vesicles   -
             Size(mm):  0.1-3.0
             Percent:    10
             Location: SCATTERED
             Shape: ROUND TO

             Shape: IRREGULAR




Leg : 60    Top/Bottom Interval(mm):  640/ 660  Describer: Meijer, A.
Hole: 458   Top of Core Depth(m)   :   294.50   Rock Type: IGNEOUS
Core:  32   Sample Midpoint(m)     :   296.65   Sect/Pc #:  2/PCE 9

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: SUBOPHITIC-INTERSERTAL;
       Where sampled: FLOW INTERIOR*

Groundmass - PLAGIOCLASE               (   30%)
             Size(mm):    0.1-1.0  Morphology: TABULAR-ACICULAR
             PARTLY ALTERED,APPROX COMP AN70-75;

             CLINOPYROXENE             (   25%)
             Size(mm):    0.1-0.6  Morphology: EQUANT-TABULAR
             APPROX COMP UNCERTAIN,PARTLY ALTERED;

             GLASS
             ALTERED TO CLAYS AND ZEOLITES;

             CARBONATE                 (   10%)
             ON EXTERIOR SURFACE;

             MAGNETITE                 (    2%)
             Size(mm):   0.01-0.1  Morphology: EUHEDRAL-SKELETAL

Alteration - CLAY MINERALS             (   10%)
             Location: LINE VESICLES  Replacing: GLASS + CPX + PLAG IN PART

             CARBONATE                 (   10%)
             Location: EXTERIOR
             Location: SURFACE

             ZEOLITE                   (    3%)
             Location: INTERSTICES    Replacing: GLASS

Vesicles   -
             Size(mm):  0.1-1.0
             Percent:    20
             Location: THROUGHOUT
             Filling: NONE
             Shape: IRREGULAR-

             Shape: OVOID
             MEAN SIZE IS 0.2MM*




Leg : 60    Top/Bottom Interval(mm): 1230/1250  Describer: Meijer, A.
Hole: 458   Top of Core Depth(m)   :   294.50   Rock Type: IGNEOUS
Core:  32   Sample Midpoint(m)     :   297.24   Sect/Pc #:  2/PCE 15B

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: INTERSERTAL-SUBOPHITIC;
       Where sampled: FLOW INTERIOR*

Phenocrysts- CLINOPYROXENE             (   TR%)
             MICROPHENOCRYSTS*

Groundmass - GLASS                     (   40%)
             ALTERED TO CLAYS,ZEOLITES,CARB;

             PLAGIOCLASE               (   30%)
             Size(mm):    0.1-0.6  Morphology: ACICULAR-TABULAR
             APPROX COMP UNCERTAIN,PARTLY ALTERED;

             CLINOPYROXENE             (   20%)
             Size(mm):    0.1-0.6  Morphology: EQUANT-TABULAR
             PARTLY ALTERED;

             MAGNETITE                 (    2%)
             Size(mm):   0.01-0.1

Alteration - CLAY MINERALS             (   10%)
             Location: INTERSTITIAL   Replacing: GLASS

             ZEOLITE                   (    3%)
             Location: INTERSTITIAL   Replacing: GLASS+VESICLES

             CARBONATE                 (    2%)
             Location: INTERSTITIAL   Replacing: GLASS

Vesicles   -
             Size(mm):  0.1-1.0
             Percent:     8
             Location: THROUGHOUT
             Filling: MINOR ZEOLITES
             Shape: IRREGULAR-

             Shape: OVOID
             MEAN SIZE IS 0.2MM*




Leg : 60    Top/Bottom Interval(mm): 1130/1170  Describer: Meijer, A.
Hole: 458   Top of Core Depth(m)   :   294.50   Rock Type: IGNEOUS
Core:  32   Sample Midpoint(m)     :   298.65   Sect/Pc #:  3/PCE 12B

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: INTERSERTAL;
       Where sampled: FLOW INTERIOR*

Groundmass - PLAGIOCLASE               (   30%)
             Size(mm):    0.1-1.0  Morphology: TABULAR,SPHERULITIC,DENDRITIC
             MOSTLY TABULAR-ONLY SOME SPHERULITIC + DENDRITIC,
             APPROX COMP AN70;

             GLASS                     (   25%)
             MOSTLY ALTERED TO CLAYS;

             CLINOPYROXENE             (   10%)
             Size(mm):   0.01-1.0  Morphology: EQUANT-TABULAR
             PARTLY ALTERED TO CLAY,MEAN = 0.5MM;

             MAGNETITE                 (    4%)

Alteration - CLAY MINERALS             (   20%)
             Location: INTERSTITIAL   Replacing: CPX + PLAG + GLASS

             ZEOLITE                   (    2%)
             Location: LINE VESICLES  Replacing: UNCERTAIN

             CARBONATE                 (   TR%)
             Location: INTERSTITIAL   Replacing: GLASS

Vesicles   -
             Size(mm):  0.1-0.6
             Percent:    30
             Location: THROUGHOUT
             Filling: NONE
             Shape: IRREGULAR-

             Shape: OVOID




Leg : 60    Top/Bottom Interval(mm):  400/ 420  Describer: Meijer, A.
Hole: 458   Top of Core Depth(m)   :   294.50   Rock Type: IGNEOUS
Core:  32   Sample Midpoint(m)     :   299.41   Sect/Pc #:  4/PCE 4B

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: INTERSERTAL-SUBOPHITIC;
       Where sampled: FLOW INTERIOR*

Groundmass - GLASS                     (   30%)
             DEVITRIFIED MOSTLY,ALTERED TO CLAYS AND ZEOLITES;

             PLAGIOCLASE               (   25%)
             Size(mm):    0.1-1.0  Morphology: ACICULAR-TABULAR
             APPROX COMP AN70,PARTLY ALTERED TO CLAY;

             CLINOPYROXENE             (   25%)
             Size(mm):    0.1-0.6  Morphology: EQUANT-TABULAR
             APPROX COMP UNCERTAIN,PARTLY ALTERED TO CLAY;

             MAGNETITE
             Morphology: EQUANT-ANHEDRAL

Alteration - CLAY MINERALS             (   20%)
             Location: INTERSTICES    Replacing: GLASS + CPX + PLAG

             ZEOLITE                   (    2%)
             Location: INTERSTICES    Replacing: GLASS

Vesicles   -
             Size(mm):  0.1-1.0
             Percent:    15
             Location: THROUGHOUT
             Filling: MINOR ZEOLITES
             Shape: IRREGULAR-

             Shape: OVOID




Leg : 60    Top/Bottom Interval(mm):  580/ 600  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   304.00   Rock Type: IGNEOUS
Core:  33   Sample Midpoint(m)     :   304.59   Sect/Pc #:  1/PCE 8

ROCK = HIGH MG BRONZITE ANDESITE
       COARSE GRAINED;
       Texture: SUBOPHITIC;
       Where sampled: FLOW INTERIOR*

Groundmass - PLAGIOCLASE               (   60%)
             Size(mm):    0.1-1.0  Morphology: EUHEDRAL-MICROLITIC-PATCHY
             PLAG IS OF TWO TYPES-40% IS EUHEDRAL-TABULAR-
             MICROLITIC-IDIOMORPHIC AND 60% IS PATCHY-
             INTERSTITIAL-XENOMORPHIC,ABUNDANT;

             CLINOPYROXENE             (   22%)
             Size(mm):    0.1-0.5  Morphology: GRANULAR-PRISMATIC

             MICROCRYST GROUNDMASS     (    5%)

             QUARTZ                    (    2%)
             Size(mm):    0.1-0.2  Morphology: ANHEDRAL

Alteration - CLAY MINERALS             (    3%)
             IN MESOSTASIS*

Vesicles   -
             Size(mm):  0.1-0.8
             Percent:    10
             Location: SCATTERED
             Filling: NONE
             Shape: IRREGULAR




Leg : 60    Top/Bottom Interval(mm):  700/ 720  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   304.00   Rock Type: IGNEOUS
Core:  33   Sample Midpoint(m)     :   306.21   Sect/Pc #:  2/PCE 8B

ROCK = HIGH MG BRONZITE ANDESITE
       COARSEST GRAINED ROCK AT SITE 458;
       Texture: SUBOPHITIC;
       Where sampled: FLOW INTERIOR*

Groundmass - PLAGIOCLASE               (   40%)
             Morphology: TABULAR-MICROLITE,PATCHY
             TWO TYPES OF PLAG-TABULAR TO MICROLITE AND PATCHY
             INTERSTITIAL;

             CLINOPYROXENE             (   34%)

             MICROCRYST GROUNDMASS     (   15%)
             ALTERED TO BROWN AND GREEN CLAYS AND FE.OXIDES;

             MAGNETITE                 (    1%)
             Morphology: CUBIC,SKELETAL

             ORTHOPYROXENE             (   TR%)
             ALTERATION TO CLAYS*

Alteration - CARBONATE                 (   10%)
             ALL IN ONE VEIN ABOUT 0.5CM WIDE;

             CLAY MINERALS             (    5%)
             IN MESOSTASIS*

Vesicles   -
             Size(mm):  0.1-1.0
             Percent:    10
             Location: SCATTERED
             Filling: NONE
             Shape: IRREGULAR
             INTERSERTAL BROWN PATCHES NEAR LARGER VESICLES*




Leg : 60    Top/Bottom Interval(mm):  480/ 520  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   313.50   Rock Type: IGNEOUS
Core:  34   Sample Midpoint(m)     :   315.50   Sect/Pc #:  2/PCE 2A

ROCK = HIGH MG BRONZITE ANDESITE
       FAIRLY COARSE GRAINED;
       Texture: SUBOPHITIC;

Groundmass - PLAGIOCLASE               (   40%)
             Morphology: EUHEDRAL,MICROLITIC,PATCHY
             TWO TYPES OF PLAG-MICROLITIC AND INTERSTITIAL,
             APPROX COMP AN45,2VZ OF 85;

             CLINOPYROXENE             (   23%)
             Morphology: EUHEDRAL,PRISMATIC-SKELETAL

             MICROCRYST GROUNDMASS     (   10%)
             CLAYS;

             MAGNETITE                 (    1%)
             Morphology: CUBIC-SKELETAL

             QUARTZ                    (    1%)
             IDENTITY UNCERTAIN,STRAINED*

Alteration - CLAY MINERALS             (   10%)

             ZEOLITE                   (   TR%)
             Location: INTERSTITIAL   Replacing: GLASS

             CARBONATE                 (   TR%)
             Location: FILL VESICLES

Vesicles   -
             Percent:    20




Leg : 60    Top/Bottom Interval(mm):   80/ 100  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   323.00   Rock Type: IGNEOUS
Core:  35   Sample Midpoint(m)     :   323.09   Sect/Pc #:  1/PCE 2

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: SUBOPHITIC;
       Where sampled: FLOW INTERIOR*

Groundmass - PLAGIOCLASE               (   30%)
             Size(mm):    0.1-0.7  Morphology: MICROLITIC
             PATCHY INTERSTITIAL MATERIAL AS WELL,SOME LOW 2VZ
             POSSIBLY K-OLIGOCLASE(?);

             GLASS                     (   28%)
             ALTERED AFTER INTERSERTAL GLASS,MESOSTASIS;

             CLINOPYROXENE             (   20%)
             Size(mm):    0.1-0.7

             QUARTZ                    (   TR%)
             IDENTITY UNCERTAIN,MOSTLY STRAINED*

Alteration - CLAY MINERALS             (   15%)
             Replacing: INTERSERTAL GLASS

             CARBONATE                 (    2%)
             Location: IN ONE VEIN

Vesicles   -
             Size(mm):  0.1-1.0
             Percent:    20
             Location: SCATTERED
             Filling: NONE
             Shape: IRREGULAR




Leg : 60    Top/Bottom Interval(mm):  690/ 710  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   323.00   Rock Type: IGNEOUS
Core:  35   Sample Midpoint(m)     :   325.20   Sect/Pc #:  2/PCE 8

ROCK = HIGH MG BRONZITE ANDESITE
       ALTERED GLASSY CPX-RICH,OF ALL OF THIS TYPE OF
       ROCK IN CORES 28-40 THIS IS THE GLASSIEST,CLOSEST
       TO PILLOW MARGIN;
       Texture: SPHERULITIC;
       Where sampled: GLASSY MARGIN*

Groundmass - GLASS                     (   85%)
             FAINTLY BIREFRINGENT NEEDLES DISPERSED IN GLASS-
             POSSIBLY PLAG(?) OR CLAYS(?);

             CLINOPYROXENE             (   10%)
             Morphology: MICROLITIC,SPHERULITIC
             MOST ARE SPHERULITIC,CPX ABUNDANT SHEAF
             SPHERULITES*

Alteration - CLAY MINERALS
             Replacing: CPX + GLASS

Vesicles   -
             Size(mm): 0.05-0.1
             Percent:     5
             Location: SCATTERED
             Filling: NONE
             Shape: ROUND




Leg : 60    Top/Bottom Interval(mm):  450/ 470  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   342.00   Rock Type: IGNEOUS
Core:  37   Sample Midpoint(m)     :   342.46   Sect/Pc #:  1/PCE 5

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: INTERSERTAL-SPHERULITIC;
       Where sampled: PILLOW INTERIOR-FLOW INTERIOR;
       AREA UNCERTAIN,ROCK IS IN TWO ZONES*

Groundmass - MICROCRYST GROUNDMASS     (   50%)
             MESOSTASIS IS BROWN GLASS WITH ABUNDANT TINY XTLS
             OF PLAG + CPX,NOW LARGELY ALTERED TO CLAYS;

             PLAGIOCLASE               (   30%)
             Morphology: MICROLITIC

             CLINOPYROXENE             (   14%)
             Morphology: IRREGULAR,SKELETAL

             ORTHOPYROXENE             (    1%)

             MAGNETITE                 (   TR%)

Alteration - CLAY MINERALS             (   25%)
             Replacing: MESOSTASIS

Vesicles   -
             Size(mm):  0.1-1.0
             Percent:     5
             Location: SCATTERED
             Shape: IRREGULAR




Leg : 60    Top/Bottom Interval(mm):   50/  70  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   351.50   Rock Type: IGNEOUS
Core:  38   Sample Midpoint(m)     :   351.56   Sect/Pc #:  1/PCE 1A

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: HYALOPILITIC,SOMEWHAT PILOTAXITIC;
       Where sampled: GLASSY MARGIN*

Phenocrysts- CLINOPYROXENE             (    5%)
             Size(mm):    0.2-0.7  Morphology: SKELETAL,DENDRITIC,PRISMATIC

             ORTHOPYROXENE             (    1%)
             Size(mm):    0.3-0.5  Morphology: PRISMATIC
             2VX OF 80-85,BRONZITE*

Groundmass - GLASS                     (   54%)
             ONCE ALL GLASS-NOW ALTERED,GLASSY FRAGMENT WITH
             INTENSE ZONED ALTERATION TO ZEOLITE + CLAYS +
             FE-OXIDES ON RIMS,CLEAR ZEOLITE ALONE IN MIDDLE;

             CLINOPYROXENE             (   35%)
             Size(mm):   0.01-0.1  Morphology: MICROLITES
             CPX NOT AFFECTED BY GLASS ALTERATION*

Alteration - CLAY MINERALS
             Replacing: GLASS

             ZEOLITE
             Replacing: GLASS
             PROPORTIONS VARY FROM PLACE TO PLACE OF ZEOLITES
             AND CLAYS*

Vesicles   -
             Size(mm):  0.5-1.0
             Percent:     5
             Location: ON ONE SIDE
             Filling: CLAYS + ZEOLITE
             Shape: ROUND




Leg : 60    Top/Bottom Interval(mm):  330/ 350  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   370.50   Rock Type: IGNEOUS
Core:  40   Sample Midpoint(m)     :   370.84   Sect/Pc #:  1/PCE 1D

ROCK = HIGH MG BRONZITE ANDESITE
       ALTERED;
       Texture: HYALOPILITIC;
       Where sampled: GLASSY MARGIN*

Phenocrysts- CLINOPYROXENE             (    3%)
             Size(mm):    0.2-0.5  Morphology: SKELETAL-PRISMATIC
             ALTERED*

Groundmass - GLASS                     (   47%)
             ONCE GLASS BUT NOW CLAYS AND HAS A STREAKY
             APPEARANCE OF FLOW PRODUCED LINES OF CLEAR CPX-
             FREE GLASS NOW ALTERED TO CLAYS;

             CLINOPYROXENE             (   10%)
             Size(mm):    0.1-0.3  Morphology: SKELETAL,MICROLITIC
             TINY SKELETAL MICROLITES*

Alteration - CLAY MINERALS             (   60%)
             Replacing: CPX+GLASS+LINE VESICLES

Vesicles   -
             Size(mm):  0.1-0.5
             Percent:    40




Leg : 60    Top/Bottom Interval(mm):  880/ 900  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   370.50   Rock Type: IGNEOUS
Core:  40   Sample Midpoint(m)     :   372.89   Sect/Pc #:  2/PCE 7

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: INTERSERTAL
       ALTERED,SOME SPHERULITIC ASPECTS;
       Where sampled: PILLOW INTERIOR*

Phenocrysts- CLINOPYROXENE             (    5%)
             Size(mm):    0.2-0.7  Morphology: SKELETAL
             ALTERED MOSTLY TO CLAYS*

Groundmass - CLINOPYROXENE             (    5%)
             Size(mm):    0.1-0.2
             ABUNDANT INTERSTITIAL CPX MICROLITES ARRANGED IN
             SPHERULITIC SWORLS AND NEEDLES,MANY ARE SKELETAL
             AND ALTERED TO CLAYS;

             PLAGIOCLASE
             AMOUNT HARD TO ESTIMATE*

Alteration - CLAY MINERALS             (   50%)
             Location: MOST PLACES    Replacing: MOST OF THE ROCK

Vesicles   -
             Size(mm):  0.1-1.0
             Percent:    40
             Location: SCATTERED
             Filling: CLAY-LINED
             Shape: IRREGULAR




Leg : 60    Top/Bottom Interval(mm):   30/  50  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   380.00   Rock Type: IGNEOUS
Core:  41   Sample Midpoint(m)     :   380.04   Sect/Pc #:  1/PCE 1

ROCK = APHYRIC BASALT;
       Texture: INTERSERTAL;
       Where sampled: FLOW INTERIOR;
       AREA UNCERTAIN*

Phenocrysts- PLAGIOCLASE               (   TR%)
             Size(mm):    0.5-1.0
             APPROX COMP UNCERTAIN,NONE ORIENTED FOR COMP.;

             CLINOPYROXENE             (   TR%)
             APPROX COMP UNCERTAIN*

Groundmass - GLASS                     (   52%)
             DIVIDED BETWEEN BROWN OXIDIZED GLASS AND PALE
             GREEN CLAYS,BROWN MOST ABUNDANT NEAR
             INTERCONNECTED VESICLES;

             PLAGIOCLASE               (   25%)
             Morphology: MICROLITIC

             CLINOPYROXENE             (    5%)
             Morphology: MICROLITIC-SKELETAL
             CPX ABUNDANCE LOW AS A RESULT OF REPLACEMENT BY
             CLAYS AND OPAQUES;

             MAGNETITE                 (    3%)
             Morphology: CUBIC,SKELETAL

Alteration - CLAY MINERALS             (   25%)
             Location: SCATTERED      Replacing: CPX+GLASS+LINE VESICLES

Vesicles   -
             Size(mm):  0.1-5.0
             Percent:    15
             Location: SCATTERED
             Filling: MOST EMPTY
             Shape: ROUND TO

             Shape: ELONGATE
             STRUNG OUT IN LINES,SOME INTERCONNECTED*




Leg : 60    Top/Bottom Interval(mm):  220/ 260  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   380.00   Rock Type: IGNEOUS
Core:  41   Sample Midpoint(m)     :   380.24   Sect/Pc #:  1/PCE 1

ROCK = APHYRIC BASALT;
       Texture: INTERSERTAL;
       Where sampled: PILLOW INTERIOR*

Phenocrysts- PLAGIOCLASE               (   TR%)
             Size(mm):        1.0  Morphology: EUHEDRAL
             ONE RIDDLED WITH HOLES,APPROX COMP UNCERTAIN;

             CLINOPYROXENE             (   TR%)

Groundmass - MICROCRYST GROUNDMASS     (   55%)
             MOSTLY GLASS ALTERED TO CLAYS,DARKER MORE
             SPHERULITIC ZONES NEAR VESICLES;

             PLAGIOCLASE               (   25%)
             Morphology: TABULAR,MICROLITIC,SKELETAL,

             Morphology: IRREGULAR
             MOSTLY MICROLITIC;

             CLINOPYROXENE             (    4%)

             MAGNETITE                 (    1%)

Alteration - CLAY MINERALS             (  >50%)
             Location: MOST PLACES    Replacing: GLASS
             MOST IS CLEAR,SOME PALE BROWN OR PALE GREEN*

Vesicles   -
             Size(mm):  0.1-1.0
             Percent:    15
             Location: SCATTERED
             Filling: NONE
             Shape: IRREGULAR




Leg : 60    Top/Bottom Interval(mm):  340/ 370  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   399.00   Rock Type: IGNEOUS
Core:  43   Sample Midpoint(m)     :   399.36   Sect/Pc #:  1/PCE 6

ROCK = HIGH MG BRONZITE ANDESITE
       VERY BADLY ALTERED AND THEREFORE CANNOT DO MUCH
       QUANTITATIVELY;
       Texture: SPHERULITIC;
       Where sampled: NEXT TO GLASSY MARGIN*

Groundmass - PLAGIOCLASE
             ABUNDANT SWORLS OF SPHERULITIC PLAG;

             CLINOPYROXENE
             MINOR SKELETAL CPX,CRYSTALLIZED BEFORE PLAG,PLAG
             AND CPX RELATIVE ABUNDANCIES QUITE DIFFERENT FROM
             CORE 41 THIN SECTIONS;

             GLASS
             GLASS IN BETWEEN SPHERULITE FIBERS NOW ALTERED TO
             CLAYS,CLAYS ARE UBIQUITOUS*

Alteration - CLAY MINERALS
             Replacing: GLASS

Vesicles   -
             Size(mm):  0.1-1.0
             Percent:    10
             Location: SCATTERED
             Filling: CLAYS
             Shape: ROUND TO

             Shape: IRREGULAR




Leg : 60    Top/Bottom Interval(mm): 1040/1070  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   399.00   Rock Type: IGNEOUS
Core:  43   Sample Midpoint(m)     :   400.06   Sect/Pc #:  1/PCE 19

ROCK = HIGH MG BRONZITE ANDESITE;
       Texture: INTERSERTAL,APHYRIC,SPHERULITIC
       SPHERULITIC NEAR VESICLES;
       Where sampled: PILLOW INTERIOR
       AREA UNCERTAIN*

Groundmass - PLAGIOCLASE               (   50%)
             Size(mm):    0.2-0.5  Morphology: SKELETAL-EUHEDRAL,ANHEDRAL
             TWO TYPES-INTERSTITIAL TYPE IS ANHEDRAL WITH
             APPROX COMP OF AN45,SKELETAL-EUHEDRAL TYPE HAS
             APPROX COMP OF AN50-55;

             MICROCRYST GROUNDMASS     (   37%)
             ALTERED TO CLAYS + FE-OXIDES,BROWNISH COLOR;

             CLINOPYROXENE             (    5%)
             Size(mm):       <0.2
             MORPHOLOGY DIFFICULT TO RESOLVE BECAUSE OF
             COMPOSITION;

             MAGNETITE                 (    1%)
             Morphology: CUBIC

Alteration - CLAY MINERALS
             Replacing: GLASS + VESICLES

Vesicles   -
             Size(mm):  0.1-1.5
             Percent:     7
             Location: SCATTERED
             Filling: SOME WITH
             Shape: ROUND TO

             Filling: YELLOW CLAYS
             Shape: IRREGULAR




Leg : 60    Top/Bottom Interval(mm):  780/ 800  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   427.50   Rock Type: IGNEOUS
Core:  46   Sample Midpoint(m)     :   428.29   Sect/Pc #:  1/PCE 7

ROCK = APHYRIC BASALT
       THIN SECTION IS POOR;
       Texture: PILOTAXITIC;
       Where sampled: NEXT TO GLASSY MARGIN*

Phenocrysts- PLAGIOCLASE               (   TR%)
             Size(mm):    0.1-0.2  Morphology: EUHEDRAL
             MICROPHENOCRYSTS*

Groundmass - GLASS                     (   89%)
             LITTLE RED ALTERATION ZONES PARALLELING DIRECTION
             OF PLAG ALIGNMENT-PROBABLY ARE PARTINGS AND
             VESICLE STRINGS IN THE ROCK,MICROXLN ONCE GLASS
             NOW ALTERED TO CLAYS + RED FE-OXIDES (SKELETAL);

             PLAGIOCLASE               (   10%)
             APPROX COMP AN54(?),MAX. EXTINCTION,FLUIDAL
             ALIGNMENT;

             CLINOPYROXENE             (   TR%)
             Morphology: SKELETAL
             PROBABLY NEEDLE-LIKE SPHERULITES*

Alteration - CLAY MINERALS
             Location: MOST PLACES    Replacing: GLASS
             PERCENT MEANINGLESS-TOO DISPERSED WITH FE-OX ETC.*

Vesicles   -
             Size(mm):  0.2-0.5
             Percent:     1
             Location: SCATTERED
             Filling: CLAY-LINED
             Shape: ROUND
             ONLY A FEW PRESENT*




Leg : 60    Top/Bottom Interval(mm):  690/ 710  Describer: Natland, J.
Hole: 458   Top of Core Depth(m)   :   446.50   Rock Type: IGNEOUS
Core:  48   Sample Midpoint(m)     :   447.20   Sect/Pc #:  1/PCE 1

ROCK = APHYRIC BASALT;
       Texture: PILOTAXITIC;
       Where sampled: NEXT TO GLASSY MARGIN*

Phenocrysts- PLAGIOCLASE               (   TR%)
             Morphology: EUHEDRAL
             APPROX COMP AN72 BY A-NORMAL METHOD;

             CLINOPYROXENE             (   TR%)
             Morphology: GRANULAR

Groundmass - GLASS                     (   84%)
             MESOSTASIS OF HIGHLY ALTERED DEVITRIFIED GLASS
             WHOSE
             COLOR IS NOW MURKY BROWN,IT IS NOT TRANSLUCENT;

             PLAGIOCLASE               (   10%)
             Size(mm):  0.02-0.07  Morphology: MICROLITIC

             CLINOPYROXENE             (    6%)
             Morphology: MICROLITIC,SKELETAL

             MAGNETITE                 (   TR%)

Alteration - CLAY MINERALS
             Location: DISPERSED      Replacing: GLASS
             MODERATELY ABUNDANT;

             FERROUS OXIDE
             Location: DISPERSED      Replacing: GLASS
             RED COLOR,ABUNDANT*

Vesicles   -
             Size(mm):  0.1-1.0
             Percent:   3-4
             Location: SCATTERED
             Filling: CLAY-LINED
             Shape: ROUND




    

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