Leg : 81 Top/Bottom Interval(mm): 480/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 493.00 Rock Type: IGNEOUS
Core: 37 Sample Midpoint(m) : 499.48 Sect/Pc #: 5/
ROCK = APHYRIC BASALT
ALTERED THOLEITIC BASALT;
Texture: ORTHOPHYRIC,HYPIDIOMORPHIC,APHYRIC,VESICULAR,
Texture: HYTIC;
Where sampled: NEAR FLOW TOP*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): .0 Morphology: 5LATHS
APPROX COMP LABRADORITE;
CLINOPYROXENE ( 5%)
Size(mm): .0 Morphology: 1ETCHED
APPROX COMP AUGITE, REPLACED BY CLAYS;
MAGNETITE ( 10%)
Size(mm): .0 Morphology: 3SUBHEDRAL
Alteration - CLAY MINERALS ( 20%)
Location: GROUNDMASS Replacing: AUGITE
INCLUDES VERY DARK SMEC WITH FINELY DIVIDED
OPAQUES*
Vesicles -
Size(mm): .8
Percent: 20
Location: THROUGHOUT
Filling: SMEC-MARGINS
Shape: CIRCULAR
Filling: ONLY
Leg : 81 Top/Bottom Interval(mm): 0/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 493.00 Rock Type: IGNEOUS
Core: 37 Sample Midpoint(m) : 499.64 Sect/Pc #: CC/
ROCK = APHYRIC BASALT
ALTERED THOLEITIC BASALT;
Texture: APHYRIC,ORTHOPHYRIC,HYPIDIOMORPHIC,VESICULAR;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): .05 Morphology: LATHS
APPROX COMP POSSIBLY LABRADORITE;
MAGNETITE ( 10%)
Size(mm): .02 Morphology: SUBHEDRAL
POSSIBLY ALTERED*
Alteration - CLAY MINERALS ( 30%)
Location: GROUNDMASS Replacing: AUGITE+PLAG+MAGN
ID UNCERTAIN FOR MAGN, VERY DARK-DUE POSSIBLY TO
OPAQUES*
Vesicles -
Size(mm): 1
Percent: 20
Location: THROUGHOUT
Filling: VERY DARK SMEC
Shape: CIRCULAR
POSSIBLY SPHERULITIC*
Leg : 81 Top/Bottom Interval(mm): 330/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 502.50 Rock Type: IGNEOUS
Core: 38 Sample Midpoint(m) : 502.83 Sect/Pc #: 1/PCE 2
ROCK = APHYRIC BASALT
ALTERED THOLEITIC BASALT;
Texture: APHYRIC,ORTHOPHYRIC,HYPIDIOMORPHIC,VESICULAR,
Texture: HYTIC;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): .1 Morphology: LATHS
APPROX COMP LABRADORITE;
CLINOPYROXENE ( 5%)
Size(mm): .0 Morphology: 5SUBHEDRAL-ANHEDRAL
SUBHED-ANHED ORIGINALLY NOW REPLACED BY CLAY;
MAGNETITE ( 5%)
Size(mm): .05 Morphology: SUBHEDRAL-EUHEDRAL
Alteration - CLAY MINERALS ( 20%)
Location: GROUNDMASS Replacing: AUGITE
INCLUDES SMEC*
Vesicles -
Size(mm): .5
Percent: 25T
Location: HROUGHOUT
Filling: SMEC
Shape: CIRCULAR
SPHERULITIC HABIT IN SEVERAL*
Leg : 81 Top/Bottom Interval(mm): 600/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 502.50 Rock Type: IGNEOUS
Core: 38 Sample Midpoint(m) : 504.60 Sect/Pc #: 2/PCE 4C
ROCK = APHYRIC BASALT
THOLEIITIC BASALT;
Texture: APHYRIC,ORTHOPHYRIC,HYPIDIOMORPHIC,VESICULAR,
Texture: HYTIC;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): .2 Morphology: LATHS
APPROX COMP AN58;
CLINOPYROXENE ( 20%)
Size(mm): .0 Morphology: 5SUBHEDRAL-ANHEDRAL
APPROX COMP AUGITE,ALTERED TO CLAY;
MAGNETITE ( 5%)
Size(mm): .0 Morphology: 5SUBHEDRAL-EUHEDRAL
Alteration - CLAY MINERALS ( 5%)
Location: GROUNDMASS Replacing: AUGITE
Vesicles -
Size(mm): .8
Percent: 30
Location: THROUGHOUT
Filling: SMEC
Shape: CIRCULAR
Leg : 81 Top/Bottom Interval(mm): 1150/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 512.00 Rock Type: IGNEOUS
Core: 39 Sample Midpoint(m) : 513.15 Sect/Pc #: 1/PCE 10
ROCK = PLAG SPARSELY PHYRIC BASALT
ALTERED THOLEIITE;
Texture: SPARSELY PHYRIC,ORTHOPHYRIC,HYPIDIOMORPHIC,
VESICULAR,TRACHYTIC*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): .5 Morphology: PRISMS
APPROX COMP LABRADOR, PARTIALLY ALTERED TO CLAYS*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): .2 Morphology: LATHS
APPROX COMP LABRADORITE,SLIGHTLY ALTERED;
MAGNETITE ( 5%)
Size(mm): .04 Morphology: SUBHEDRAL-EUHEDRAL
Alteration - CLAY MINERALS ( 28%)
Location: GROUNDMASS Replacing: AUGITE,SOME PLAG
INCLUDES SMEC;
HEMATITE ( 1%)
Location: GROUNDMASS, Replacing: CLAYS
Location: VESICLE
Location: MARGINS
Vesicles -
Size(mm): .5X2
Percent: 25
Location: THROUGHOUT
Filling: SMEC
Shape: ELONGATE-
Shape: IRREGULAR
WELL-CRYSTALLIZED*
Leg : 81 Top/Bottom Interval(mm): 160/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 521.50 Rock Type: IGNEOUS
Core: 40 Sample Midpoint(m) : 521.66 Sect/Pc #: 1/PCE 3
ROCK = APHYRIC BASALT
ALTERED THOLEIITIC BASALT;
Texture: APHYRIC,ORTHOPHYRIC,HYPIDIOMORPHIC,VESICULAR,
Texture: HYTIC;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): .1 Morphology: LATHS
APPROX COMP LABRADORITE;
MAGNETITE ( 10%)
Size(mm): .04 Morphology: SUBHEDRAL-EUHEDRAL
Alteration - CLAY MINERALS ( 20%)
Location: GROUNDMASS Replacing: AUGITE
INCLUDES SMEC*
Vesicles -
Size(mm): 20X5
Percent: 30
Location: THROUGHOUT
Filling: MARGINS ONLY-
Shape: ELONGATE,
Filling: SMEC+CELADONITE
Shape: IRREGULAR
Leg : 81 Top/Bottom Interval(mm): 550/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 521.50 Rock Type: IGNEOUS
Core: 40 Sample Midpoint(m) : 523.55 Sect/Pc #: 2/PCE 2
ROCK = PLAG SPARSELY PHYRIC BASALT
ALTERED THOLEIITIC BASALT;
Texture: SPARSELY PHYRIC,ORTHOPHYRIC,HYPIDIOMORPHIC,
VESICULAR,TRACHYTIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): .5 Morphology: PRISMATIC
APPROX COMP LABRADORITE*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): .05 Morphology: LATHS
APPROX COMP LABRADORITE;
MAGNETITE ( 15%)
Size(mm): .03
ID UNCERTAIN FOR MAGN, POSSIBLY ALTERED, MORE
ABUNDANT IN ALTERED BASALT THAN FRESH, POSSIBLE
SECONDARY OPAQUE DEVELOPMENT, VARIATIONS IN COMP,
TEX-PATCHES OF SLIGHTLY FINER GRAINED BASALT WITH
MORE ABUNDANT OPAQUES*
Alteration - CLAY MINERALS ( 34%)
Location: GROUNDMASS Replacing: AUGITE + SOME
Replacing: PLAG
Vesicles -
Size(mm): 1X.5
Percent: 10
Location: THROUGHOUT
Filling: SMEC
Shape: ELONGATE-
Shape: IRREGULAR
WELL-XTLLIZED*
Leg : 81 Top/Bottom Interval(mm): 1120/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 531.00 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 532.12 Sect/Pc #: 1/PCE 16
ROCK = PLAG SPARSELY PHYRIC BASALT
ALTERED THOLEIITIC BASALT;
Texture: ORTHOPHYRIC,SPARSELY PHYRIC,HYPIDIOMORPHIC,
Texture: HYTIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): .5 Morphology: LATHS,PRISMS
APPROX COMP LABRADORITE*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .1 Morphology: LATHS
APPROX COMP LABRADORITE;
MAGNETITE ( 5%)
Size(mm): .04 Morphology: SUBHEDRAL-EUHEDRAL
SOME VARIATION IN OPAQUE DISTRIBUTION-LARGE PATCH
POSSIBLY BASALT CLAST REWORKED INTO FRESH LAVA
FLOW,ONE MARGIN SHARP-WHEN TRACED ALONG BECOMES
GRADATIONAL INTO MAIN BASALT*
Alteration - CLAY MINERALS ( 43%)
Location: GROUNDMASS Replacing: AUGITE
Location: FRACTURES
Vesicles -
Size(mm): .4
Percent: 1
Filling: SMEC
Shape: CIRCULAR
Leg : 81 Top/Bottom Interval(mm): 1120/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 531.00 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 533.62 Sect/Pc #: 2/PCE 13
ROCK = PLAG SPARSELY PHYRIC BASALT
ALTERED THOLEIITIC BASALT;
Texture: SPARSELY PHYRIC,VESICULAR,ORTHOPHYRIC,
HYPIDIOMORPHIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): .5 Morphology: PRISMS,LATHS
ZONED, APPROX COMP LABRADORITE*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .0 Morphology: 5LATHS
APPROX COMP LABRADORITE;
CLINOPYROXENE ( 1%)
Size(mm): .0 Morphology: 2SUBHEDRAL
SHOWS SIGNS OF ALTERATION,APPROX COMP AUGITE;
MAGNETITE ( 10%)
Size(mm): .0 Morphology: 2SUBHEDRAL
SHOWS SIGNS OF ALTERATION*
Alteration - CLAY MINERALS ( 28%)
Location: GROUNDMASS Replacing: AUGITE + MAGN
ID UNCERTAIN FOR MAGN*
Vesicles -
Size(mm): 1X.4
Percent: 10
Location: THROUGHOUT
Filling: SMEC(MARGINS
Shape: ELONGATE
Filling: ONLY)
Leg : 81 Top/Bottom Interval(mm): 160/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 540.50 Rock Type: IGNEOUS
Core: 42 Sample Midpoint(m) : 540.66 Sect/Pc #: 1/PCE 2
ROCK = PLAG MODERATELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: PORPHYRITIC,TRACHYTIC*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): 3 Morphology: LATHS
APPROX COMP AN58, SET IN ZONE WITH FEWER OPAQUES
THAN REST OF GNDMASS,ALSO SLIGHTLY FINER GRAINED-
PROBABLY REENCLOSED BASALT CLAST INCORPORATED INTO
FLOW*
Groundmass - PLAGIOCLASE ( 55%)
Size(mm): .1 Morphology: LATHS
APPROX COMP AN55;
CLINOPYROXENE ( 20%)
Size(mm): .05 Morphology: SUBHEDRAL-ANHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 10%)
Size(mm): .1 Morphology: EUHEDRAL-SUBHEDRAL
Alteration - CLAY MINERALS ( 10%)
Location: GROUNDMASS Replacing: AUGITE
INCLUDES SMEC*
Leg : 81 Top/Bottom Interval(mm): 440/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 540.50 Rock Type: IGNEOUS
Core: 42 Sample Midpoint(m) : 542.44 Sect/Pc #: 2/PCE 6
ROCK = APHYRIC BASALT
THOLEIITIC BASALT;
Texture: APHYRIC,HYPIDIOMORPHIC, TRACHYTIC;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .2 Morphology: LATHS
APPROX COMP LABRADORITE;
CLINOPYROXENE ( 25%)
Size(mm): .05 Morphology: SUBHEDRAL
APPROX.COMP AUGITE;
MAGNETITE ( 5%)
Size(mm): .0 Morphology: 5EUHEDRAL-SUBHEDRAL
Alteration - CARBONATE ( 10%)
Location: VEIN
RADIATING XTLS;
CLAY MINERALS ( 10%)
Location: GROUNDMASS Replacing: AUGITE
INCLUDES SMEC*
Leg : 81 Top/Bottom Interval(mm): 200/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 550.00 Rock Type: IGNEOUS
Core: 43 Sample Midpoint(m) : 550.20 Sect/Pc #: 1/PCE 3
ROCK = APHYRIC BASALT
ALTERED THOLEIITIC BASALT;
Texture: APHYRIC,ORTHOPHYRIC,HYPIDIOMORPHIC,TRACHYTIC;
Where sampled: FLOW TOP*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): .0 Morphology: 5LATHS
APPROX COMP LABRADORITE;
MAGNETITE ( 10%)
Size(mm): .0 Morphology: 2SUBHEDRAL
POSSIBLY ALTERED, SOME TEX AND MINERALOGICAL
VARIATIONS OVER SLIDE IN DISTINCT ZONES-PROBABLY
PRE-EXISTING BASALT ENCLOSED IN FRESH FLOW*
Alteration - CLAY MINERALS ( 40%)
Location: GNDMASS Replacing: AUGITE,SOME PLAG
INCLUDES RED SMEC,ID UNCERTAIN FOR PLAG*
Vesicles -
Size(mm): 1
Percent: 10
Location: THROUGHOUT
Filling: SMEC MARGINS,
Shape: ELONGATE
Filling: CELADONITE
Filling: INTERIORS
Leg : 81 Top/Bottom Interval(mm): 620/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 550.00 Rock Type: UNIDENTIFIED
Core: 43 Sample Midpoint(m) : 550.62 Sect/Pc #: 1/PCE 4E
ROCK = BASALTIC BRECCIA
AGGLOMERITIC,LITHIC VOLCANIC,
FRAGMENTS OF ANGULAR TO SUBROUNDED ALTERED BASALT
SIMILAR TO 81-553A-45-4-20CM,SOME DISTINCTLY
VESICULAR-INTERNALLY AND ALONG MARGINS*
Where sampled: OVERLYING BASALT FLOW,SCORIACEOUS TOP
LOCATION UNCERTAIN*
Alteration - CLAY MINERALS ( 20%)
Location: FRACTURES AND Replacing: CELADONITE,SMEC
Location: VESICLES
Leg : 81 Top/Bottom Interval(mm): 400/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 550.00 Rock Type: IGNEOUS
Core: 43 Sample Midpoint(m) : 551.90 Sect/Pc #: 2/PCE 3
ROCK = PLAG SPARSELY PHYRIC BASALT
ALTERED THOLEIITIC BASALT;
Texture: SPARSELY PHYRIC, ORTHOPHYRIC,HYPIDIOMORPHIC,
Texture: HYTIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 2%)
Size(mm): 1-5
ALTERED TO CLAYS IN PART*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): .1 Morphology: LATHS
APPROX COMP LABRADORITE;
CLINOPYROXENE ( 15%)
Size(mm): .05 Morphology: SUBHEDRAL-ANHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 10%)
Size(mm): .05 Morphology: EUHEDRAL-SUBHEDRAL
POSSIBLY ALTERED TO LESS WELL-XTLIZED MAGN,
INDISTINCT INHOMOGENEITIES-PLAG PHENOS LOCALLY
ASSOCIATED WITH COARSER PYX,WIDE VARIATION IN
OPAQUE DISTRIBUTION,POSSIBLY RESORBED BASALT*
Alteration - CLAY MINERALS ( 38%)
Location: GROUNDMASS Replacing: AUGITE,SOME PLAG
INCLUDES SMEC*
Leg : 81 Top/Bottom Interval(mm): 1090/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 550.00 Rock Type: IGNEOUS
Core: 43 Sample Midpoint(m) : 552.59 Sect/Pc #: 2/PCE 5B
ROCK = PLAG SPARSELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: SPARSELY PHYRIC,ORTHOPHYRIC,HYPIDIOMORPHIC,
VESICULAR,TRACHYTIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 2%)
Size(mm): .5
ZONED, TOO FEW XTLS FOR MORPHOLOGY DETERMINATION*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .2 Morphology: LATHS
APPROX COMP LABRADORITE;
CLINOPYROXENE ( 35%)
Size(mm): .05 Morphology: ANHEDRAL-SUBHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 5%)
Size(mm): .1 Morphology: EUHEDRAL-ANHEDRAL
Alteration - CLAY MINERALS ( 3%)
Location: GROUNDMASS Replacing: AUGITE
INCLUDES SMEC*
Vesicles -
Size(mm): .5
Percent: 5
Filling: SMEC
Shape: CIRCULAR
WELL-XTLLIZED*
Leg : 81 Top/Bottom Interval(mm): 560/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 559.50 Rock Type: IGNEOUS
Core: 44 Sample Midpoint(m) : 561.56 Sect/Pc #: 2/PCE 1B
ROCK = APHYRIC BASALT
THOLEIITIC BASALT;
Texture: APHYRIC, ORTHOPHYRIC,HYPIDIOMORPHIC*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .20 Morphology: LATHS
NOT TRACHYTIC,APPROX COMP AN65;
CLINOPYROXENE ( 38%)
Size(mm): .05 Morphology: ANHEDRAL-SUBHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 10%)
Size(mm): .10 Morphology: EUHEDRAL-SUBHEDRAL
NO OBVIOUS ORDER OF CRYSTALLIZATION*
Alteration - CLAY MINERALS ( 2%)
Location: GROUNDMASS Replacing: AUGITE
INCLUDES SMEC*
Leg : 81 Top/Bottom Interval(mm): 430/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 562.00 Rock Type: TUFF
Core: 45 Sample Midpoint(m) : 562.43 Sect/Pc #: 1/
ROCK = VITRIC TUFF;
Texture: VITROCLASTIC;
Where sampled: MID-ASH FALL UNIT*
Groundmass - PLAGIOCLASE ( 5%)
APPROX COMP POSSIBLY LABRADORITE;
GLASS ( 90%)
Size(mm): .7
BROWN ISOTROPIC,MINOR ALTERATION-SOME SHARDS
STREAKED OUT-POSSIBLY WELDED-BUT MOST ARE NOT
AFFECTED;
LITHIC ( 3%)
Size(mm): .5
BASALT-INCLUDES OPAQUES + PLAG*
Alteration - CLAY MINERALS ( 1%)
ALTERED SHARDS;
HEMATITE ( 1%)
ALTERED SHARDS*
Leg : 81 Top/Bottom Interval(mm): 1280/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 562.00 Rock Type: IGNEOUS
Core: 45 Sample Midpoint(m) : 563.28 Sect/Pc #: 1/
ROCK = APHYRIC BASALT
ALTERED THOLEIITIC BASALT;
Texture: APHYRIC,VESICULAR,ORTHOPHYRIC,HYPIDIOMORPHIC;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): .05 Morphology: LATHS
APPROX COMP LABRADORITE;
MAGNETITE ( 15%)
Size(mm): .05 Morphology: SUBHEDRAL
MAGN PROBABLY ALTERED AS POSSIBLY POORLY XTLLIZED*
Alteration - CLAY MINERALS ( 15%)
Location: GROUNDMASS Replacing: AUGITE
INCLUDES SMEC*
Vesicles -
Size(mm): 5
Percent: 50
Location: THROUGHOUT
Filling: CELADONITE
Shape: IRREGULAR-
Shape: ROUND
CELADONITE ALTERING TO OPAQUE AMORPHOUS MATERIAL*
Leg : 81 Top/Bottom Interval(mm): 1160/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 562.00 Rock Type: IGNEOUS
Core: 45 Sample Midpoint(m) : 564.66 Sect/Pc #: 2/PCE 12B
ROCK = APHYRIC BASALT
ALTERED THOLEIITIC BASALT;
Texture: APHYRIC,VESICULAR,TRACHYTIC,ORTHOPHYRIC,
HYPIDIOMORPHIC;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): .1 Morphology: LATHS
APPROX COMP LABRADORITE
MAGNETITE ( 5%)
Size(mm): .05 Morphology: SUBHEDRAL,EUHEDRAL
THERE IS ONE DISTINCT AREA WITH COARSE PLAG AND
MORE OPAQUES*
Alteration - CLAY MINERALS ( 25%)
Location: GROUNDMASS Replacing: AUGITE
INCLUDES SMEC*
Vesicles -
Size(mm): 5
Percent: 30
Location: THROUGHOUT
Filling: SMEC RIMS,
Shape: IRREGULAR
Filling: CELADONITE
Shape: TO ELONGATE
Filling: CENTERS
Leg : 81 Top/Bottom Interval(mm): 230/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 562.00 Rock Type: IGNEOUS
Core: 45 Sample Midpoint(m) : 565.23 Sect/Pc #: 3/PCE 3
ROCK = PLAG SPARSELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: SPARSELY PHYRIC,ORTHOPHYRIC,HYPIDIOMORPHIC,
TRACHYTIC*
Phenocrysts- PLAGIOCLASE ( 2%)
Size(mm): 1 Morphology: LATHS-PRISMS
APPROX COMP LABRADORITE*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .15 Morphology: LATHS
TRACHYTIC, APPROX COMP AN60;
CLINOPYROXENE ( 23%)
Size(mm): .01 Morphology: ANHEDRAL-SUBHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 10%)
Size(mm): .10
PATCHES OF COARSE GRAINED PLAG (PHENOS) ARE
ASSOCIATED WITH COARSE PYX OFTEN WITH CPX AS THE
EARLIER PHASE-COARSE PATCHES POSSIBLY MORE SLOWLY
COOLED*
Alteration - CLAY MINERALS ( 10%)
Location: GROUNDMASS Replacing: AUGITE
INCLUDES SMEC*
Vesicles -
Size(mm): .5
Percent: 50
Location: THROUGHOUT
Filling: SMEC LININGS
Shape: OVAL
Location: BUT MINOR
Leg : 81 Top/Bottom Interval(mm): 810/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 562.00 Rock Type: IGNEOUS
Core: 45 Sample Midpoint(m) : 565.81 Sect/Pc #: 3/PCE 6
ROCK = PLAG SPARSELY PHYRIC BASALT
ALTERED THOLEIITIC BASALT;
Texture: SPARSELY PHYRIC,VESICULAR,ORTHOPHYRIC,
HYPIDIOMORPHIC,TRACHYTIC*
Phenocrysts- PLAGIOCLASE ( 2%)
Size(mm): .3 Morphology: LATHS AND PRISMS
APPROX COMP LABRADORITE*
Groundmass - PLAGIOCLASE ( 55%)
Size(mm): .2 Morphology: LATHS
APPROX COMP UNKNOWN, SOME TRACHYTIC-DISPLACED
AROUND VESICLES;
MAGNETITE ( 5%)
Size(mm): .05 Morphology: EUHEDRAL-SUBHEDRAL
VERY DISTINCT INHOMOGENEITIES IN TEX AND COMP
OFTEN AROUND PLAG PHENOS*
Alteration - CLAY MINERALS ( 23%)
Location: GROUNDMASS Replacing: AUGITE
INCLUDES SMEC*
Vesicles -
Size(mm): .3X.1
Percent: 15
Location: THROUGHOUT
Filling: SMEC RIMS,
Shape: ELONGATE
Filling: CELADONITE
Filling: CENTERS
Leg : 81 Top/Bottom Interval(mm): 200/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 562.00 Rock Type: UNIDENTIFIED
Core: 45 Sample Midpoint(m) : 566.70 Sect/Pc #: 4/PCE 3
ROCK = BASALTIC BRECCIA
AGGLOMERATE,LITHIC VOLCANIC,
FRAGMENTS OF ANGULAR TO SUBROUNDED ALTERED BASALT
CONSISTING OF LABRADOR AND FINELY DIVIDED OPAQUES
AND CLAYS, SIMILAR TO BASALTS DESCRIBED ELSEWHERE
AT SITE 553A, SOME DISPLAY MARGINS SUGGESTIVE OF
BROKEN-UP VESICULAR BASALT;
Where sampled: OVERLYING BASALT FLOW, POSSIBLY SCORIACEOUS TOP*
Alteration - CLAY MINERALS ( 60%)
Location: FRACTURES
WELL-XTLIZED IN FRACTURES, ALSO LOCATED IN GNDMASS
OF BASALTIC FRAGMENTS BUT POORLY XTLLIZED*
Leg : 81 Top/Bottom Interval(mm): 610/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 571.50 Rock Type: IGNEOUS
Core: 46 Sample Midpoint(m) : 575.11 Sect/Pc #: 3/PCE 6
ROCK = APHYRIC BASALT
THOLEIITIC BASALT;
Texture: APHYRIC, ORTHOPHYRIC, TRACHYTIC, HYPIDIOMORPHIC
ONE VESICLE;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 55%)
Size(mm): .15 Morphology: LATHS
APPROX COMP AN55;
CLINOPYROXENE ( 32%)
Size(mm): .05 Morphology: SUBHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 3%)
Size(mm): .10 Morphology: EUHEDRAL-SUBHEDRAL
PLAG+CPX+MAGN ALL INTERGROWN BUT MAGN OFTEN
AROUND PLAG*
Alteration - CLAY MINERALS ( 5%)
Location: GROUNDMASS Replacing: AUGITE
INCLUDES SMEC*
Vesicles -
Size(mm): 5X1
Percent: 5
Filling: SMEC
Shape: ELONGATE
ONE ONLY, SMEC IN ACICULAR XTLS,ALTERED MARGIN
ALSO*
Leg : 81 Top/Bottom Interval(mm): 940/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 571.50 Rock Type: IGNEOUS
Core: 46 Sample Midpoint(m) : 576.94 Sect/Pc #: 4/PCE 12
ROCK = PLAG SPARSELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: SPARSELY PHYRIC, ORTHOPHYRIC-HYPIDIOMORPHIC,
SOME TRACHYTIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 1 Morphology: LATHS,PRISMS
APPROX COMP LABRADORITE,ZONED,VERY MINOR PHASE*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .10 Morphology: LATHS
APPROX COMP AN57;
CLINOPYROXENE ( 40%)
Size(mm): .04 Morphology: ANHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 5%)
Size(mm): .10 Morphology: EUHEDRAL-SUBHEDRAL
PLAG+CPX+MAGN ALL INTERGROWN WITH NO DISCERNIBLE
ORDER OF XTLLIZATION*
Alteration - CLAY MINERALS ( 2%)
Location: GROUNDMASS Replacing: AUGITE
INCLUDES SMEC*
Vesicles -
Size(mm): 1.5
Percent: 2
Filling: SMEC
Shape: CIRCULAR
Leg : 81 Top/Bottom Interval(mm): 520/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 580.50 Rock Type: IGNEOUS
Core: 47 Sample Midpoint(m) : 581.02 Sect/Pc #: 1/PCE 2C
ROCK = PLAG MODERATELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: MODERATELY PHYRIC,HYPIDIOMORPHIC-ORTHOPHYRIC
(MINOR GLOMEROPHYRIC), TRACHYTIC,VESICULAR;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): .5 Morphology: LATHS,PRISMS
APPROX COMP LABRADORITE, ONE GROUP GLOMEROPHYRIC*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .1 Morphology: LATHS
APPROX COMP LABRADORITE;
CLINOPYROXENE ( 32%)
Size(mm): .05 Morphology: SUBHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 2%)
Size(mm): .1 Morphology: EUHEDRAL-SUBHEDRAL
ALTERING TO GOETHITE ON MARGINS*
Alteration - CLAY MINERALS ( 5%)
Location: GROUNDMASS Replacing: GLASS (+ AUGITE)
INCLUDES SMEC;
GOETHITE
Location: AROUND MAGN Replacing: MAGN
Location: AND IN CLAYS
Vesicles -
Size(mm): 2X1
Percent: 5
Filling: CELADONITE
Shape: ELONGATE
ONE ONLY*
Leg : 81 Top/Bottom Interval(mm): 90/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 580.50 Rock Type: IGNEOUS
Core: 47 Sample Midpoint(m) : 583.59 Sect/Pc #: 3/PCE 1A
ROCK = PLAG MODERATELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: MODERATELY PHYRIC,HYPIDIOMORPHIC-ORTHOPHYRIC,
VESICULAR,TRACHYTIC,MINOR GLOMEROPHYRIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 3%)
Size(mm): 1 Morphology: PRISMATIC
APPROX COMP LABRADORITE, ONE GROUP ASSOCIATED W/
COARSER AUGITES-GLOMEROPHYRIC*
Groundmass - PLAGIOCLASE ( 34%)
Size(mm): .3 Morphology: LATHS
LABRADORITE, APPROX COMP AN56;
CLINOPYROXENE ( 30%)
Size(mm): .15 Morphology: EUHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 2%)
Size(mm): 0.1 Morphology: EUHEDRAL
POSSIBLE SLIGHT ALTERATION TO GOETHITE;
ALKALI FELDSPAR ( 1%)
Size(mm): .1
INTERSTITIAL*
Alteration - CLAY MINERALS ( 5%)
Location: GROUNDMASS Replacing: GLASS(+ AUGITE)
INCLUDES SMEC, SOME GOETHITE STAINING*
Vesicles -
Size(mm): .5
Percent: 25
Shape: CIRCULAR
ONE ZONE-HALF OF SLIDE*
Leg : 81 Top/Bottom Interval(mm): 1010/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 580.50 Rock Type: UNIDENTIFIED
Core: 47 Sample Midpoint(m) : 586.01 Sect/Pc #: 4/PCE 8
ROCK = BASALTIC BRECCIA
EXTENSIVELY ALTERED LITHIC VOLCANIC,
FRAGMENTS OF HIGHLY ALTERED VESICULAR BASALT
(SOME PLAG STILL FRESH + OCCASIONAL PSEUDOMORPHS
OF AUGITE),IN GROUNDMASS OF WELL-XTLLIZED SMEC
(ALTERED GLASS?),ALTERATION PRODUCTS ARE VERY
DARK RED-PROBABLY GOETHITE DISSEMINATED THROUGH
SMEC*
Where sampled: TOP OF BASALT FLOW*
Leg : 81 Top/Bottom Interval(mm): 170/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 587.50 Rock Type: IGNEOUS
Core: 48 Sample Midpoint(m) : 587.67 Sect/Pc #: 1/PCE 1B
ROCK = PLAG MODERATELY PHYRIC BASALT
THOLEIITIC BASALT;
Texture: MODERATELY PHYRIC,HYPIDIOMORPHIC-ORTHOPHYRIC,
VESICULAR,VARIOLITIC TO TRACHYTIC,MINOR PORPHYRITIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): 2 Morphology: LATHS,PRISMS
APPROX COMP LABRADORITE*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): .4 Morphology: LATHS
APPROX COMP LABRADORITE, SOME VARIOLITIC TEXTURE;
CLINOPYROXENE ( 25%)
Size(mm): .1 Morphology: SUBHEDRAL
APPROX COMP AUGITE, ASSOCIATED WITH BIOTITE;
MAGNETITE ( 5%)
Size(mm): .2 Morphology: EUHEDRAL
MARGINAL ALTERATION TO GOETHITE;
HORNBLENDE ( 5%)
Size(mm): .05 Morphology: PLATY-FIBROUS
RIMMING AUGITES-LAST REACTION PHASE?,GREEN COLOR*
Alteration - CLAY MINERALS ( 10%)
Location: GROUNDMASS Replacing: BIOTITE + GLASS (+ AUGITE)
INCLUDES SMEC;
GOETHITE ( TR%)
Location: AROUND MAGN
Vesicles -
Size(mm): 5.0
Percent: 20
Location: THROUGHOUT
Filling: SMEC
Shape: CIRCULAR TO
Shape: ELONGATE
Leg : 81 Top/Bottom Interval(mm): 210/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 587.50 Rock Type: IGNEOUS
Core: 48 Sample Midpoint(m) : 589.21 Sect/Pc #: 2/PCE 2A
ROCK = PLAG-OL-CPX MODERATELY PHYRIC BASALT
THOLEITIC BASALT;
Texture: MODERATELY PHYRIC, ORTHOPHYRIC-HYPIDIOMORPHIC,
LOCALLY GLOMEROPHYRIC,TRACHYTIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( 2%)
Size(mm): .5
COMPLETELY ALTERED-RIMMED WITH OPAQUES AND
POSSIBLY IDDINGSITE CLAY CENTERS;
PLAGIOCLASE ( 3%)
Size(mm): .1 Morphology: LATHS
APPROX COMP LABRADORITE;
CLINOPYROXENE ( 2%)
Size(mm): .5 Morphology: SUBHEDRAL
APPROX COMP AUGITE*
Groundmass - PLAGIOCLASE ( 46%)
Size(mm): .3 Morphology: LATHS
APPROX COMP LABRADORITE;
CLINOPYROXENE ( 30%)
Size(mm): .1 Morphology: SUBHEDRAL
APPROX COMP AUGITE, ASSOCIATED WITH BIOTITE;
MAGNETITE ( 5%)
Size(mm): .2 Morphology: SUBHEDRAL
OFTEN ASSOCIATED WITH GOETHITE;
HORNBLENDE ( TR%)
Size(mm): .01
OCCUR CLOSER TO AUGITE GRAINS*
Alteration - CLAY MINERALS ( 10%)
Location: GROUNDMASS Replacing: GLASS PHASE,(AUGITE + OL)
GOETHITE ( 2%)
Location: GROUNDMASS + Replacing: OL,MAGN,IDDINGS
Location: IN OLIVINE
Location: PSEUDOMORPHS
ID UNCERTAIN FOR GOETHITE AND IDDINGSITE*
Leg : 81 Top/Bottom Interval(mm): 570/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 587.50 Rock Type: IGNEOUS
Core: 48 Sample Midpoint(m) : 594.07 Sect/Pc #: 5/PCE 2C
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT
THOLEITIC BASALT;
Texture: MODERATELY PHYRIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( 1%)
Size(mm): .5
COMPLETELY ALTERED TO CLAYS,ID UNCERTAIN FOR OL;
PLAGIOCLASE ( 3%)
Size(mm): 1 Morphology: LATHS
APPROX COMP LABRADORITE;
CLINOPYROXENE ( 2%)
Size(mm): .5
APPROX COMP AUGITE, PLAG AND CPX OCCUR IN ONE
MASS TOGETHER (GLOMEROPHYRIC),ORDER OF XTLLIZATION
NOT DETECTABLE,CRYSTALS STRAINED(BOTH AUGITE+PLAG)
SOME BROKEN*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): .3 Morphology: LATHS
APPROX COMP AN55;
CLINOPYROXENE ( 30%)
Size(mm): .15 Morphology: SUBHEDRAL-ANHEDRAL
MAGNETITE ( 5%)
Size(mm): .2 Morphology: EUHEDRAL
Alteration - CLAY MINERALS ( 10%)
Location: GROUNDMASS Replacing: GLASS(+AUGITE)
INCLUDES SMEC,OFTEN IRON STAINED-GOETHITE*
Vesicles -
Size(mm): .3
Percent: 5
Location: THROUGHOUT
Filling: SMEC
Shape: CIRCULAR
Leg : 81 Top/Bottom Interval(mm): 770/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 596.50 Rock Type: IGNEOUS
Core: 49 Sample Midpoint(m) : 600.27 Sect/Pc #: 3/PCE 1B
ROCK = PLAG-OL-CPX MODERATELY PHYRIC BASALT
THOLEITIC BASALT;
Texture: MODERATELY PHYRIC,HYPIDIOMORPHIC-ORTHOPHYRIC BUT
LOCALLY GLOMEROPHYRIC,TRACHYTIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( 1%)
Size(mm): .2
COMPLETELY ALTERED TO CLAYS+MAGN AND GOETHITE;
PLAGIOCLASE ( 5%)
Size(mm): .8 Morphology: LATHS
APPROX COMP LABRADORITE;
CLINOPYROXENE ( 1%)
Size(mm): .2
APPROX COMP AUGITE, PLAG AND CPX OCCUR TOGETHER
IN GLOMEROPHYRIC MASSES*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): .3 Morphology: LATHS
APPROX COMP AN58;
CLINOPYROXENE ( 34%)
Size(mm): .10 Morphology: SUBHEDRAL-ANHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 5%)
Size(mm): .15 Morphology: EUHEDRAL
MARGINAL ALTERATION TO GOETHITE*
Alteration - CLAY MINERALS ( 7%)
Location: GROUNDMASS Replacing: GLASS(+AUGITE AND OL)
GOETHITE ( 1%)
Location: GROUNDMASS
LOCATED PARTICULARLY IN CLAYS AND AROUND MAGN*
Vesicles -
Size(mm): .7
Percent: 1
Filling: SMEC
Shape: CIRCULAR
ONE ONLY*
Leg : 81 Top/Bottom Interval(mm): 640/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 596.50 Rock Type: IGNEOUS
Core: 49 Sample Midpoint(m) : 601.64 Sect/Pc #: 4/PCE 1B
ROCK = VEIN QUARTZ;
Texture: SPHERULITIC;
Where sampled: VEIN IN BASALT*
LENGTH FAST SPHERULITIC CHALCEDONY AND GOETHITE
BLOBS, GOETHITE ALSO DENDRITIC STAINED, ALSO LOCAL
RADIATING CALCITE, BLOBS ARE PSEUDO-OOLITIC-
CONCENTRIC*
Leg : 81 Top/Bottom Interval(mm): 510/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 605.50 Rock Type: IGNEOUS
Core: 50 Sample Midpoint(m) : 607.51 Sect/Pc #: 2/PCE 1B
ROCK = APHYRIC BASALT
THOLEITIC BASALT;
Texture: APHYRIC,HYPIDIOMORPHIC-ORTHOPHYRIC,TRACHYTIC;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): .2 Morphology: LATHS
APPROX COMP LABRADORITE;
CLINOPYROXENE ( 30%)
Size(mm): .05 Morphology: SUBHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 10%)
Size(mm): .05 Morphology: EUHEDRAL-SUBHEDRAL
HORNBLENDE ( 10%)
Size(mm): .05 Morphology: FLAKES,FIBROUS
RIMMING AUGITES*
Alteration - CLAY MINERALS ( 10%)
Location: GROUNDMASS Replacing: AUGITE,BIOTITE,GLASS PHASE
ID UNCERTAIN FOR REPLACED MINERALS;
GOETHITE ( TR%)
Leg : 81 Top/Bottom Interval(mm): 260/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 605.50 Rock Type: IGNEOUS
Core: 50 Sample Midpoint(m) : 608.76 Sect/Pc #: 3/PCE 1A
ROCK = PLAG SPARSELY PHYRIC BASALT
ALTERED THOLEITIC BASALT;
Texture: SPARSELY PHYRIC,HYPIDIOMORPHIC-ORTHOPHYRIC,
VESICULAR,VARIOLITIC*
Phenocrysts- PLAGIOCLASE ( 2%)
Size(mm): 5 Morphology: PRISMATIC
APPROX COMP LABRADORITE*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): .05 Morphology: LATHS
TOO SMALL FOR APPROX COMP DETERMINATION;
CLINOPYROXENE ( 18%)
Size(mm): .03
APPROX COMP AUGITE, ALTERATION TO CLAYS COMMON;
MAGNETITE ( 5%)
Size(mm): .03
Alteration - CLAY MINERALS ( 30%)
Location: GROUNDMASS Replacing: GLASS
ID UNCERTAIN FOR GLASS-LAST PHASE*
Vesicles -
Size(mm): .3
Percent: 15
Location: THROUGHOUT
Shape: CIRCULAR
Leg : 81 Top/Bottom Interval(mm): 710/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 618.00 Rock Type: IGNEOUS
Core: 52 Sample Midpoint(m) : 621.71 Sect/Pc #: 3/PCE 11
ROCK = PLAG SPARSELY PHYRIC BASALT
THOLEITIC BASALT;
Texture: SPARSELY PHYRIC,HYPIDIOMORPHIC-ORTHOPHYRIC,
Texture: HYTIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): .7 Morphology: LATHS
APPROX COMP LABRADORITE, ONE GROUP OF 4 XTLS*
Groundmass - PLAGIOCLASE ( 54%)
Size(mm): .2 Morphology: LATHS
APPROX COMP LABRADORITE;
CLINOPYROXENE ( 30%)
Size(mm): .05 Morphology: SUBHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 5%)
Size(mm): .1 Morphology: EUHEDRAL
Alteration - CLAY MINERALS ( 10%)
Location: GROUNDMASS Replacing: GLASS
ID UNCERTAIN FOR GLASS-INTERSTITIAL PHASE*
Leg : 81 Top/Bottom Interval(mm): 880/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 618.00 Rock Type: IGNEOUS
Core: 52 Sample Midpoint(m) : 621.88 Sect/Pc #: 3/PCE 13
ROCK = APHYRIC BASALT
THOLEITIC BASALT;
Texture: APHYRIC,HYPIDIOMORPHIC-ORTHOPHYRIC,VESICULAR,
(VARIOLITIC-TRACHYTIC);
Where sampled: FLOW INTERIOR NEAR TOP
LOCATION FOR NEAR TOP UNCERTAIN*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): .1 Morphology: LATHS
TOO SMALL FOR APPROX COMP DETERMINATION,SOME
VARIOLITIC;
CLINOPYROXENE ( 20%)
Size(mm): .05 Morphology: SUBHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 50%)
Size(mm): .05 Morphology: EUHEDRAL
Alteration - CLAY MINERALS ( 15%)
Location: GROUNDMASS Replacing: GLASS PHASE
INCLUDES SOME REDDISH MATERIAL- POSSIBLY GOETHITE
OR IDDINGSITE*
Vesicles -
Size(mm): .8X.4
Percent: 25
Location: THROUGHOUT
Filling: SMEC RIMS
Shape: ELONGATE
Leg : 81 Top/Bottom Interval(mm): 1430/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 618.00 Rock Type: IGNEOUS
Core: 52 Sample Midpoint(m) : 622.43 Sect/Pc #: 3/PCE 20
ROCK = APHYRIC BASALT
ALTERED THOLEITIC BASALT;
Texture: APHYRIC,HYPIDIOMORPHIC-ORTHOPHYRIC,VESICULAR,
Texture: HYTIC;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): .05 Morphology: LATHS
APPROX COMP POSSIBLY LABRADORITE;
CLINOPYROXENE ( 5%)
Size(mm): .02 Morphology: SUBHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 10%)
Size(mm): .05
ALTERED, POSSIBLE SECONDARY DEVELOPMENT-MORE
ABUNDANT HERE, SOME REDDENING AT MARGINS*
Alteration - CLAY MINERALS ( 25%)
Location: GROUNDMASS Replacing: GLASS + AUGITE
ID UNCERTAIN FOR AUGITE*
Vesicles -
Size(mm): 1
Percent: 35
Location: THROUGHOUT
Filling: SMEC LINING,
Shape: IRREGULAR,
Filling: CELADONITE
Shape: ELONGATE
Leg : 81 Top/Bottom Interval(mm): 960/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 623.50 Rock Type: IGNEOUS
Core: 53 Sample Midpoint(m) : 624.46 Sect/Pc #: 1/PCE 6F
ROCK = APHYRIC BASALT
THOLEITIC BASALT;
Texture: APHYRIC,HYPIDIOMORPHIC-ORTHOPHYRIC,TRACHYTIC;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .20 Morphology: LATHS
APPROX COMP LABRADORITE AN57;
CLINOPYROXENE ( 30%)
Size(mm): .03 Morphology: SUBHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 5%)
Size(mm): .05 Morphology: EUHEDRAL-SUBHEDRAL
HORNBLENDE ( 5%)
Size(mm): .03
Alteration - CLAY MINERALS ( 10%)
Location: GROUNDMASS Replacing: HORNBLENDE + GLASS
Leg : 81 Top/Bottom Interval(mm): 1320/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 623.50 Rock Type: IGNEOUS
Core: 53 Sample Midpoint(m) : 624.82 Sect/Pc #: 1/PCE 6G
ROCK = PLAG SPARSELY PHYRIC BASALT
ALTERED THOLEITIC BASALT;
Texture: SPARSELY PHYRIC,ORTHOPHYRIC,VESICULAR,TRACHYTIC;
Where sampled: FLOW INTERIOR NEAR TOP*
Phenocrysts- PLAGIOCLASE ( 2%)
Size(mm): .7 Morphology: PRISMS
APPROX COMP LABRADORITE,GROUPS OF 2 OR 3*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): .1
APPROX COMP LABRADORITE,ALTERED IN PLACES;
CLINOPYROXENE ( 1%)
Size(mm): .02 Morphology: SUBHEDRAL
APPROX COMP AUGITE,ALTERED;
MAGNETITE ( 10%)
Size(mm): .05 Morphology: EUHEDRAL
HORNBLENDE ( 1%)
Size(mm): .02 Morphology: PLATES
ALTERED*
Alteration - CLAY MINERALS ( 41%)
Location: GROUNDMASS Replacing: SMEC
SMEC REPLACES ALL BUT PLAG BUT WITH MUCH SECONDARY
DISSEMINATED OPAQUES*
Vesicles -
Size(mm): .2
Percent: 5
Location: THROUGHOUT
Shape: CIRCULAR
Leg : 81 Top/Bottom Interval(mm): 780/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 632.50 Rock Type: IGNEOUS
Core: 54 Sample Midpoint(m) : 637.78 Sect/Pc #: 4/PCE 2C
ROCK = PLAG-CPX MODERATELY PHYRIC BASALT
THOLEITIC BASALT;
Texture: MODERATELY PHYRIC,HYPIDIOMORPHIC-ORTHOPHYRIC,
Texture: HYTIC LOCALLY,MINOR GLOMEROPHYRIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 4%)
Size(mm): 1 Morphology: PRISMS
APPROX COMP LABRADORITE,ENCLOSING PYX;
CLINOPYROXENE ( 1%)
Size(mm): .3
APPROX COMP AUGITE*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): .4 Morphology: LATHS
APPROX COMP AN56;
CLINOPYROXENE ( 30%)
Size(mm): .05 Morphology: SUBHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 5%)
Size(mm): .1 Morphology: EUHEDRAL
HORNBLENDE ( 5%)
Size(mm): .03 Morphology: FIBROUS
OCCURS WITH PYX*
Alteration - CLAY MINERALS ( 10%)
Location: GROUNDMASS Replacing: GLASS PHASE
Leg : 81 Top/Bottom Interval(mm): 770/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 641.50 Rock Type: UNIDENTIFIED
Core: 55 Sample Midpoint(m) : 643.77 Sect/Pc #: 2/PCE 8
ROCK = BASALTIC BRECCIA
AGGLOMERATE-LITHIC VOLCANIC,
VESICULAR HIGHLY ALTERED BASALT FRAGMENTS IN
MATRIX OF CLAY AND CELADONITE(ALTERED GLASS),
BASALT-OPAQUES AND PLAG,SOME TRACHYTIC,SOME
VARIOLITIC, SOME LARGE PHENOCRYSTS(1 MM)*
Leg : 81 Top/Bottom Interval(mm): 360/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 641.50 Rock Type: IGNEOUS
Core: 55 Sample Midpoint(m) : 647.86 Sect/Pc #: 5/PCE 1C
ROCK = PLAG MODERATELY PHYRIC BASALT
THOLEITIC BASALT;
Texture: MODERATELY PHYRIC,HYPIDIOMORPHIC-ORTHOPHYRIC,
Piece #: HYRITIC LOCALLY,TRACHYTIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): 1 Morphology: PRISMATIC
APPROX COMP LABRADORITE, SOME IN GROUPS*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): .30 Morphology: LATHS
APPROX COMP LABRADORITE AN60;
CLINOPYROXENE ( 35%)
Size(mm): .10 Morphology: SUBHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 5%)
Size(mm): .15 Morphology: EUHEDRAL
Alteration - CLAY MINERALS ( 7%)
Location: GROUNDMASS Replacing: GLASS
ID UNCERTAIN FOR GLASS*
Vesicles -
Size(mm): .5
Percent: 3
Location: THROUGHOUT
Filling: SMEC
Shape: CIRCULAR
Leg : 81 Top/Bottom Interval(mm): 730/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 650.50 Rock Type: UNIDENTIFIED
Core: 56 Sample Midpoint(m) : 651.23 Sect/Pc #: 1/PCE 9
ROCK = BASALTIC BRECCIA
LITHIC-VITRIC VOLCANIC,
LARGE FRAGMENTS OF ALTERED BASALT,PLUS MANY BROWN
ISOTROPIC SHARDS AND MINOR PLAG XTLS SET IN
ISOTROPIC GROUNDMASS,LOCALLY CLAY-RICH(SMEC), NOT
SCORIACEOUS TOP OF BASALT FLOW HERE-MUCH AIR-FALL
DETRITUS*
Texture: VITROCLASTIC(IN PART)*
Leg : 81 Top/Bottom Interval(mm): 1240/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 650.50 Rock Type: IGNEOUS
Core: 56 Sample Midpoint(m) : 651.74 Sect/Pc #: 1/PCE 15
ROCK = APHYRIC BASALT
ALTERED THOLEITIC BASALT;
Texture: ORTHOPHYRIC-HYPIDIOMORPHIC,APHYRIC,VESICULAR;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): .05 Morphology: LATHS
CLINOPYROXENE ( 10%)
Size(mm): <.01 Morphology: VERY FINE-GRAINED
APPROX COMP AUGITE;
MAGNETITE ( 5%)
Size(mm): .01 Morphology: EUHEDRAL-SUBHEDRAL
Alteration - CLAY MINERALS ( 60%)
Location: GROUNDMASS Replacing: ALL PHASES EXCEPT PLAG
INCLUDES SMEC,PLAG IS ALTERED*
Vesicles -
Size(mm): .5
Percent: 5
Location: THROUGHOUT
Filling: SMEC,OP.MINS
Shape: CIRCULAR
SMEC IS ALTERED,VERY RICH IN OPAQUES
(DISSEMINATED)*
Leg : 81 Top/Bottom Interval(mm): 370/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 650.50 Rock Type: IGNEOUS
Core: 56 Sample Midpoint(m) : 652.37 Sect/Pc #: 2/PCE 5
ROCK = APHYRIC BASALT
THOLEITIC BASALT;
Texture: APHYRIC,HYPIDIOMORPHIC-ORTHOPHYRIC,VESICULAR,
Texture: HYTIC;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .2 Morphology: LATHS
APPROX COMP LABRADORITE;
CLINOPYROXENE ( 30%)
Size(mm): .05 Morphology: SUBHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 8%)
Size(mm): .05 Morphology: EUHEDRAL
OTHER ( TR%)
RED MINERAL,POSSIBLY GOETHITE OR IDDINGSITE,
GROUNDMASS PHASE ONLY*
Alteration - CLAY MINERALS ( 20%)
Location: GROUNDMASS Replacing: GLASS,PARTLY
Replacing: AUGITE
INCLUDES SMEC, ID UNCERTAIN FOR GLASS*
Vesicles -
Size(mm): 2
Percent: 2
Location: THROUGHOUT
Filling: SMEC
Shape: CIRCULAR
Leg : 81 Top/Bottom Interval(mm): 600/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 659.50 Rock Type: UNIDENTIFIED
Core: 57 Sample Midpoint(m) : 660.10 Sect/Pc #: 1/PCE 8
ROCK = BASALTIC BRECCIA
VOLCANIC LITHIC,
LARGE FRAGMENTS OF ALTERED BASALT(VESICULAR IN
PART) IN CLAY MATRIX-PROBABLY ORIGINALLY GLASS,
BASALT-OPAQUES WITH PLAG LATHS,SOME WITH
VARIOLITIC TEXTURE,FINE-GRAINED,PROBABLY
SCORIACEOUS TOP OF FLOW*
Leg : 81 Top/Bottom Interval(mm): 560/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 673.00 Rock Type: IGNEOUS
Core: 59 Sample Midpoint(m) : 673.56 Sect/Pc #: 1/PCE 9
ROCK = APHYRIC BASALT
SLIGHTLY ALTERED THOLEITIC BASALT;
Texture: APHYRIC,HYPIDIOMORPHIC-ORTHOPHYRIC,VESICULAR,
VARIOLITIC,TRACHYTIC;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): .15 Morphology: LATHS
APPROX COMP LABRADORITE;
CLINOPYROXENE ( 20%)
Size(mm): .05 Morphology: SUBHEDRAL-EUHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 10%)
Size(mm): .05 Morphology: SUBHEDRAL-EUHEDRAL
Alteration - CLAY MINERALS ( 20%)
Location: GROUNDMASS Replacing: GLASS (+AUGITE)
CLAY MINERALS ( 20%)
Location: GROUNDMASS Replacing: GLASS (+AUGITE)
INCLUDES SMEC, ID UNCERTAIN FOR AUGITE*
INCLUDES SMEC, ID UNCERTAIN FOR AUGITE*
Vesicles -
Size(mm): 1X.5
Percent: 20
Location: THROUGHOUT
Filling: SMEC
Shape: ELONGATE +
Shape: IRREGULAR
Leg : 81 Top/Bottom Interval(mm): 800/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 673.00 Rock Type: IGNEOUS
Core: 59 Sample Midpoint(m) : 675.30 Sect/Pc #: 2/PCE 11
ROCK = PLAG-OL MODERATELY PHYRIC BASALT
THOLEITIC BASALT,EXTENSIVELY ALTERED;
Texture: MODERATELY PHYRIC,HYPIDIOMORPHIC-ORTHOPHYRIC-
GLOMEROPHYRIC,VESICULAR,VARIOLITIC,TRACHYTIC
GRADES TO GLOMEROPHYRIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 1 Morphology: ANHEDRAL
PLAGIOCLASE ( 5%)
Size(mm): 2 Morphology: LATHS,PRISMS
APPROX COMP LABRADORITE,ALTERED-TO SMEC IN SOME
CASES*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): .15 Morphology: LATHS
APPROX COMP LABRADORITE,SOME VARIOLITIC;
CLINOPYROXENE ( 20%)
Size(mm): .10 Morphology: ANHEDRAL-SUBHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 8%)
Size(mm): .10 Morphology: EUHEDRAL-SUBHEDRAL
QUARTZ ( TR%)
Size(mm): .05 Morphology: INTERSTITIAL
HORNBLENDE ( 10%)
Size(mm): .05 Morphology: FIBROUS
ALTERED PYROXENE*
Alteration - CLAY MINERALS ( 15%)
Location: GROUNDMASS Replacing: GLASS+HBL
ID UNCERTAIN FOR GLASS*
Vesicles -
Size(mm): .5
Percent: 5
Location: THROUGHOUT
Filling: SMEC
Shape: CIRCULAR
Leg : 81 Top/Bottom Interval(mm): 1170/ 0 Describer: Morton, A.C.
Hole: 553A Top of Core Depth(m) : 673.00 Rock Type: IGNEOUS
Core: 59 Sample Midpoint(m) : 677.17 Sect/Pc #: 3/PCE 7
ROCK = PLAG-CPX-OL PHYRIC BASALT
ALTERED THOLEITIC BASALT;
Texture: PHYRIC,HYPIDIOMORPHIC-ORTHOPHYRIC-GLOMEROPHYRIC,
VARIOLITIC,VESICULAR
MORE GLOMEROPHYRIC THAN ORTHOPHYRIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( 2%)
Size(mm): .6 Morphology: ANHEDRAL
EXTENSIVELY ALTERED;
PLAGIOCLASE ( 5%)
Size(mm): 2 Morphology: LATHS
APPROX COMP LABRADORITE,ZONED;
CLINOPYROXENE ( 3%)
Size(mm): .5 Morphology: SUBHEDRAL
APPROX COMP AUGITE,STRAINED XTLS;OL-PLAG-CPX OCCUR
ALL TOGETHER-GLOMEROCRYSTS*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): .20 Morphology: LATHS
APPROX COMP AN55;
CLINOPYROXENE ( 30%)
Size(mm): .15 Morphology: SUBHEDRAL-ANHEDRAL
APPROX COMP AUGITE;
MAGNETITE ( 2%)
Size(mm): .10 Morphology: EUHEDRAL
QUARTZ ( 1%)
Size(mm): .1 Morphology: INTERSTITIAL
Alteration - CLAY MINERALS ( 10%)
Location: GROUNDMASS Replacing: GLASS
Vesicles -
Size(mm): 3
Percent: 2
Location: THROUGHOUT
Filling: SMEC
Shape: CIRCULAR
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