Leg : 19 Top/Bottom Interval(mm): 0/ 0 Describer: Natland, J.
Hole: 191 Top of Core Depth(m) : 905.00 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 905.10 Sect/Pc #: CC/
ROCK = PLAG MODERATELY PHYRIC BASALT
ENCODED FROM IR SITE CHAPTER, ALTERED;
Texture: VARIOLITIC
NO GLASSY PATCHES FREE OF VARIOLITES OR XTLS BUT
SOME PATCHES OF GREEN NONTRONITE MAY BE THEIR
REMAINS, WHERE VARIOLITES ARE RELATIVELY FREE OF
THE PLAG IN MICROLITES SOMETIMES A FINE
CROSS-HATCHED PATTERN CAN BE SEEN WHERE TWO
PYX SHEAFS HAVE INTERGROWN*
Groundmass - LABRADORITE
Size(mm): TO 1.5 Morphology: ACICULAR NEEDLES, LATHS
A FEW, SET IN MATRIX OF PLUMOSE SHEAFS OF
INTIMATELY INTERGROWN PLAG + PYX NEEDLES, LARGER
FELD NEEDLES OFTEN HAVE SPLAYED ENDS AND CORES OF
PYX NEEDLES,USUALLY PARALLEL TO THE PLAG 010
DIRECTION WITH LENGTH TO WIDTH RATIOS OF 10 OR
20:1, THE INTERGROWN PLAG MICROLITES TYPICALLY
FOLLOW THE BENDS AND TWISTS OF THE PYX SHEAFS
AND TUFTS-ARRANGED ROUGHLY PARALLEL WITH THE PYX
NEEDLES ALTERNATING WITH THEM AS INTEGRAL PARTS
OF THE VARIOLITES;
PYX NEEDLES,SHEAFS,TUFTS
OPAQUE MINERALS
MAY BE SECONDARY,UBIQUITOUS,VERY TINY, RATHER
UNIFORMLY SCATTERED EXCEPT WHERE CONCENTRATED
BETWEEN VARIOLITES*
Alteration - NONTRONITE
Replacing: GLASS
ID UNCERTAIN FOR GLASS, GREEN*
Vesicles -
Size(mm): <0.5
Location: SCATTERED
FEW,WELL-OUTLINED BY SURROUNDING PYX SHEAFS*
Leg : 19 Top/Bottom Interval(mm): 1280/ 0 Describer: Natland, J.
Hole: 191 Top of Core Depth(m) : 910.00 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 911.28 Sect/Pc #: 1/
ROCK = PLAG PHYRIC BASALT
ALTERED,ENCODED FROM IR SITE CHAPTER, SEE PP
426-427;
Texture: SUBDIABASIC*
Phenocrysts- PLAGIOCLASE
APPROX COMP AN70-75*
Groundmass - PYROXENE
Morphology: GRAINS
LIGHT BROWN,FORMING FAIRLY WELL-DEFINED GRAINS
WITH IMPRESSIVE HERRINGBONE TEXTURE;
PLAGIOCLASE
ONLY RARELY DEVELOP SPLAYED ENDS OR RADIAL
CLUSTERS,GLOMEROCRYSTS OCCUR SPORADICALLY,
APPROX COMP 70-60 BY CARLSBAD-ALBITE TWINS;
OPAQUE MINERALS
WIDESPREAD PARTICULARLY ALONG GRAIN BOUNDARIES*
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