Leg : 26 Top/Bottom Interval(mm): 840/ 850 Describer: Kempe, D.
Hole: 253 Top of Core Depth(m) : 218.00 Rock Type: IGNEOUS
Core: 24 Sample Midpoint(m) : 218.85 Sect/Pc #: 1/
ROCK = BASALT
FAIRLY ALTERED;
Texture: SCORIACEOUS,GLASSY*
Groundmass - OLIVINE
Size(mm): .6-2
COMMON,FRESH IN GLASS;
PLAGIOCLASE
Size(mm): .8
Leg : 26 Top/Bottom Interval(mm): 930/ 0 Describer: DSDP microfilm
Hole: 253 Top of Core Depth(m) : 218.00 Rock Type: IGNEOUS
Core: 24 Sample Midpoint(m) : 218.93 Sect/Pc #: 1/
ROCK = BASALT GLASS;
Texture: GLASSY*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): TO 0.8 Morphology: LATHS
POORLY TWINNED, SCATTERED THRU DK BROWN
PALAG WHICH FORMS BULK OF ROCK;
OLIVINE ( 8%)
Size(mm): 0.6
MANY WELL-SHAPED, ALTERED TOTALLY TO IDDINGS
AGGREGATE*
Alteration - IDDINGSITE
Replacing: OL
PALAGONITE ( 82%)
Vesicles -
Filling: PALAG
PALAG RIMS INSIDE OF VESICLES*
Leg : 26 Top/Bottom Interval(mm): 1090/ 0 Describer: DSDP microfilm
Hole: 253 Top of Core Depth(m) : 218.00 Rock Type: IGNEOUS
Core: 24 Sample Midpoint(m) : 219.09 Sect/Pc #: 1/
ROCK = BASALT GLASS
IN CONTACT WITH ASH BELOW;
Texture: GLASSY, SCORIACEOUS*
Phenocrysts- PLAGIOCLASE ( 23%)
Size(mm): TO 1. Morphology: LATHS
CLEAR LATHS,ALSO PRISMATIC AND RHOMBOID
XTLS OF THE FELDSPAR, LATHS ARE TWINNED,
FREQUENTLY ZONED;
ALTHOUGH NOT USUALLY ON THE ALBITE LAW,
OLIVINE ( 1%)
Size(mm): 1.5-2. Morphology: EUHEDRAL
USUALLY FRESH,SOMETIMES EUHEDRAL*
Groundmass - GLASS ( 30%)
FRESH AND ALMOST COLORLESS,R.I. WELL ABOVE
BALSAM,REMAINDER ALTERED TO PALAG WITH LOW R.I.*
Alteration - PALAGONITE ( 40%)
DARK,REDDISH-BROWN,LOW R.I.,CONTAINS ROUND AND
IRREGULAR-SHAPED CAVITIES FILLED WITH A
SPHERULITIC,FIBROUS ZEOL AND OCCASIONALLY
CALCITE,WITHIN PALAG THE FELDSPARS ARE ALSO
HIGHLY ALTERED OR RESORBED*
COMBINATION ( 6%)
INCLUDES ZEOLITE + CALCITE,FIBROUS ZEOLITE (LENGTH
SLOW IN ORIENTATION)*
Leg : 26 Top/Bottom Interval(mm): 20/ 70 Describer: Kempe, D.
Hole: 253 Top of Core Depth(m) : 558.00 Rock Type: IGNEOUS
Core: 58 Sample Midpoint(m) : 558.05 Sect/Pc #: 1/
ROCK = BASALT
ALTERED;
Texture: GLASSY TO SUBVARIOLITIC,PORPHYRITIC*
Groundmass - OLIVINE
Size(mm): 1.0
ALTERED,VERY COMMON;
PLAGIOCLASE
Size(mm): .2-1.8
Alteration - TALC
Location: PSEUDOMORPHS Replacing: OL
SERPENTINITE
Location: PSEUDOMORPHS Replacing: OL
Leg : 26 Top/Bottom Interval(mm): 80/ 0 Describer: DSDP microfilm
Hole: 253 Top of Core Depth(m) : 558.00 Rock Type: IGNEOUS
Core: 58 Sample Midpoint(m) : 558.08 Sect/Pc #: 1/
ROCK = PLAG-OL PHYRIC BASALT
FRESH;
Texture: FINE-GRAINED,OL-RICH,PHYRIC*
Phenocrysts- PLAGIOCLASE ( 20%)
Size(mm): TO 1.8 Morphology: LATHS
NORMALLY 0.1 -0.2, AMOUNT IS ALL
PLAG IN SECTION;
OLIVINE ( 15%)
Size(mm): 0.5-1.0 Morphology: EUHEDRAL
TOTALLY ALTERED TO TALC AND COLORLESS
FIBROUS CHRYSOTILE SERPENTINE,PATCHES OF
GREEN ALTERATION MATERIAL WHICH MAY BE
BOWLINGITE , AND SKELETAL ILMENITE RODS
UP TO 0.3MM OCCUR WITHIN THE OLIVINES,
OL SOMETIMES ACCOMPANIED BY TINY,VERY
EUHEDRAL BROWN XTLS OF PROBABLY DIPYRAMIDAL
ANATASE,SOME OF OL SHOW ALTERATION BEYOND
EUHEDRAL OUTLINES OF THE XTLS INTO THE
SURROUNDING MATRIX*
Groundmass - FERROUS OXIDE ( 6%)
Morphology: GRAINS,RODS
OTHER
OCCASIONAL DISCRETE XTLS OF A REDDISH-
BROWN IRON-RICH MINERAL PRESENT;
GLASS ( 59%)
MATRIX IS SUBVARIOLITIC CONTAINS PYX,FELD,
FE ORE AND PROBABLY SOME GLASS;
PYROXENE
ILMENITE
Size(mm): TO 0.3 Morphology: SKELETAL,RODS
ANATASE
Morphology: EUHEDRAL,DIPYRAMIDAL
PROBABLY ANATASE*
Alteration - TALC
Replacing: OL
SERPENTINITE
Replacing: OL
COLORLESS FIBROUS CHRYSOTILE;
BOWLINGITE
Replacing: OL
ID UNCERTAIN,GREEN*
|
