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Core data from the Ocean Drilling Program legs 101-129
leg : 111 section: 01 unit/subunit : 0151
hole: 0504B top int: 0 cm observer code: KUE
core: 142R pieces : 1-3
rock name: MODERATELY PLAGIOCLASE-OLIVINE-CLINOPYROXENE PHYIRC BASALT.
contact : Azimuth 045. Dip 85 degrees. Intruded by chill of lithologic
Unit 152; Unit 151 not chilled.
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1-2 0.5-3.0 mm euhedral, few subhedral; fresh(?)
Clinopyroxene 3 1-2.5 mm euhedral-subhedral;fresh.
Olivine 3 0.5-2.0 mm subhedral; altered either entirely
or up to 60% to chlorite (+ oxide
?)
Random but fairly homogeneous distribution throughout unit. Occur as
single crystals. Olivines appear to alter margins inward.
***** GROUNDMASS *****
Uniformly fine grained.
***** COLOR *****
Light gray
***** VESICLES *****
Non vesicular.
***** STRUCTURE *****
Massive
***** ALTERATION *****
Relatively fresh (slightly altered), minor chloritization and minor (< 1%)
pyrite in 0.5 mm patches.
***** VEINS/FRACTURES *****
No marked alteration halos, veins comprise approximately 4% of unit.
Piece 1A and 1B - minor low-angle fractures, approximately 0.5 mm with
chlorite/clays (?) plus possible laumontite or anhydrite (?) in Piece
1B. One small open fracture in Piece 1B.
leg : 111 section: 01 unit/subunit : 0152
hole: 0504B top int: 0 cm observer code: KUE
core: 142R pieces : 1-3
rock name: HIGHLY OLIVINE-CLINOPYROXENE-PLAGIOCLASE PHYRIC BASALT
contact : Azimuth 045, runs through Pieces 1A-3. Dip 85 degrees.
Intrusive chilled against lithologic Unit 151 (hatched),
extreme marginal 2 mm possibly glassy.
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 18-20 0.5-3.0 mm subhedral, larger ones possibly
round; fresh.
Clinopyroxene 13-15 0.5-8.0 mm generally euhedral with some
bladed; light green color; fresh.
Olivine 2-4 0.3-1.0 mm Originally subhedral; altered to
chlorite with associated oxide
and pyrite.
Highly porphyritic, approximately 35% phenocrysts. Appear to be more
concentrated towards chill margin. occur generally singly but also in
few glomerocrysts.
***** GROUNDMASS *****
Uniformly very fine grained, extreme chill virtually glassy.
***** COLOR *****
Dark gray to black.
***** VESICLES *****
Nonvesicular.
***** STRUCTURE *****
Fairly massive.
***** ALTERATION *****
Fresh, 5-10%(?) chloritized, slightly altered.
***** VEINS/FRACTURES *****
Low angle, short 2-3 cm, 1 mm fractures with chlorite/hematite
filling. No halos.
leg : 111 section: 01 unit/subunit : 0153
hole: 0504B top int: 25 cm observer code: KUE
core: 142R pieces : 4-19
rock name: SPARSELY TO HIGHLY OLIVINE-CLINOPYROXENE-PLAGIOCLASE PHYRIC
BASALT.
contact : Not seen. however, phenocryst content and proportion suggest
unit may be continuation of Unit 152. See contact relations
decribed in Unit 152.
***** MAIN COMMENTS *****
Structure: Brecciated: Breccia fragments angular to rounded, vary in size
from mm size to 5 cm. Some fragments apparently originally glassy. Most
very fine-grained (chilled margin?) material. Matrix: fine-grained
chloritized material (possibly finely comminuted groundmass or possibly
chilled basalt?). Piece 15 has definite chilled margin running vertically
in core but might be portion of larger fragment.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 0-8 0.5-3.0 mm subhedral, fresh.
Clinopyroxene 0-7 0.5-3.0 mm euhedral-subhedral, some places
good bladed prisms, fresh.
Olivine 1-2 n/a overall but apparently increasing
with depth as other phenocryst
assemblages decrease in quantity,
0.5 mm average but generally
smaller towards bottom of unit;
subhedral, totally altered to
chlorite and pyrite.
Diminish from about 15% in Pieces 4-7 to 2-5% in Pieces 11-13 to 1%-
virtually absent in Pieces 16-17B.
***** GROUNDMASS *****
Very fine grained.
***** COLOR *****
Light greenish gray
***** VESICLES *****
Nonvesicular.
***** STRUCTURE *****
See comments
***** ALTERATION *****
Moderately altered to mottled light greenish gray color throughout. All
fragments have 0.25-5 mm alteration rims, light gray in color. Olivine
replaced totally to chlorite + or - pyrite.
***** VEINS/FRACTURES *****
15% filled veins. Virtually zero open fractures. Veins from 0.1-2 mm
wide, filled with chlorite and traces of sulfides.
leg : 111 section: 02 unit/subunit : 0153
hole: 0504B top int: 0 cm observer code: KUE
core: 142R pieces : 1-8
rock name: MODERATELY CLINOPYROXENE-OLIVINE-PLAGIOCLASE PHYRIC BASALT.
contact : Not seen clEarly. However, Pieces 1-2 (see Piece 2) have
small portions of chill versus Unit 153. (Unit 153 is
intruded by small portions of chilled margin). Not clear to
which unit these margins belong.
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 2-5 1-5 mm euhedral(tabular), fresh.
Olivine 1-2 0.3-3.0 mm subhedral, 100% altered to
chlorite and pyrite.
Clinopyroxene 1 1-2.5 mm light green, euhedral, fresh.
Vary from approximately 3% at top of unit to 10% at bottom of unit.
Occur as single crystals.
***** GROUNDMASS *****
Varies from top to bottom, very fine grained to fine grained. Also in
Pieces 1-3 patchy grain size varies from very fine to fine grained.
***** COLOR *****
Medium to dark gray. Light gray alteration patches throughout the unit.
***** VESICLES *****
Nonvesicular.
***** STRUCTURE *****
Massive(see grain size variation).
***** ALTERATION *****
Dark and light gray alteration halos (2-4 mm, varies according to fracture
size) around fractures in Piece 1-3. Rest of unit relatively fresh
(slightly altered).
***** VEINS/FRACTURES *****
In Pieces 1-3, fractures vertical and horizontal form about 5-7% with
width <1-1 mm. Filled with chlorite/sulfides/prehnite/quartz + or -
zeolite(?). Have zoned alteration around them with dark (chlorite/
actinolite) mm-wide zone immediately adjacent to vein and light
reaction zone outside this. Veins in Pieces 8A-8B, forming 2% of rock,
white vein-filling mineral in minor veins <<0.5 mm (possibly
laumontite).
leg : 111 section: 01 unit/subunit : 0154
hole: 0504B top int: 0 cm observer code: KUE
core: 143R pieces : 1-7
rock name: MODERATELY PLAGIOCLASE-OLIVINE-CLINOPYROXENE PHYRIC BASALT.
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 5 0.25-3.0 mm euhedral, fresh.
Olivine 4 0.25-2.0 mm euhedral, totally altered to talc
+ chlorite + pyrite + rare ferric
oxide.
Clinopyroxene 1 1-2 mm subhedral, fresh.
Homogeneous distribution throughout of single crystals.
***** GROUNDMASS *****
Uniformly fine grained.
***** COLOR *****
Dark gray.
***** VESICLES *****
Nonvesicular.
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Olivine replaced by talc + chlorite + pyrite + rare ferric oxide. Overall:
slightly altered. Piece 1, prismatic, white mineral on fractures. Light
gray alteration halos (2 mm wide) around veins in Piece 1.
***** VEINS/FRACTURES *****
< 1%, < 0.5 mm, filled with chlorite.
leg : 111 section: 01 unit/subunit : 0155
hole: 0504B top int: 40 cm observer code: KUE
core: 143R pieces : piece 8, to the end of core
rock name: MODERATELY TO HIGHLY OLIVINE-PLAGIOCLASE PHYRIC BASALT.
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 0-3 0.5-3 mm maximum in Piece 17, euhedral,
tabular, fresh.
Olivine 7-10 0.5-3 mm euhedral to subhedral, totally
altered by zoned chlorite + talc +
pyrite (+ oxides?).
Clinopyroxene n/a n/a absent (?).
Olivine as glomerocrysts, plagioclase and clinopyroxene as single
crystals. Most abundant in Pieces 17 and 18.
***** GROUNDMASS *****
Generally fine grained with patches of coarser grained material in Pieces
17-21 with interstitial chlorite (+ talc?).
***** COLOR *****
Dark gray.
***** VESICLES *****
Nonvesicular.
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Generally slightly (Pieces 8-16) to moderately (Pieces 17-22 and 143R-2,
Pieces -10) altered 143R-1, Pieces 17-21, and 143R-2, Pieces 1, 3, and 5,
contain 1-3 cm, strongly altered patches of chlorite with light greenish
gray alteration halos. Olivine replaced by zoned chlorite + talc + pyrite
(+ oxides?).
***** VEINS/FRACTURES *****
1%, < 0.5 mm, filled with chlorite (50%) and unidentified white
mineral (50%) + traces of pyrite; no apparent relationship.
leg : 111 section: 01 unit/subunit : 0156
hole: 0504B top int: 0 cm observer code: KUE
core: 144R pieces : 1
rock name: MODERATELY OLIVINE-PLAGIOCLASE-CLINOPYROXENE PHYRIC BASALT.
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 2 1-3 mm euhedral, tabular, fresh.
Olivine 3 0.5-1 mm subhedral, totally altered to
chlorite.
Clinopyroxene 1 2-5 mm subhedral, fresh.
Single crystals, uniform distribution.
***** GROUNDMASS *****
Fine grained, plagioclase crystals in mm-sized aggregates throughout.
***** COLOR *****
Dark gray.
***** VESICLES *****
Nonvesicular.
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly altered, olivine replaced by chlorite, minor disseminated pyrite.
***** VEINS/FRACTURES *****
< 0.5%, 0.5 mm, filled with chlorite. Trace anhydrite (?) on fracture
surface of Piece 1. No halos.
leg : 111 section: 01 unit/subunit : 0157
hole: 0504B top int: 8 cm observer code: KUE
core: 144R pieces : 2-9
rock name: MODERATELY PLAGIOCLASE-OLIVINE-CLINOPYROXENE PHYRIC BASALT,
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 2-5 1-3 mm euhedral(tabular) to subhedral,
fresh.
Olivine n/a n/a Pieces 3-6, 1%;Pieces 8-9, 2-3%;
0.5-4 mm;100% subhedral; totally
altered to chlorite and minor
pyrite.
Clinopyroxene 1 1-2 mm subhedral (elongated crystals,
laths), fresh.
Single crystals, uniform distribution.
***** GROUNDMASS *****
Fine grained, finer toward the base in Piece 9.
***** COLOR *****
Dark gray.
***** VESICLES *****
Nonvesicular.
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Generally slightly altered, olivine totally replaced by chlorite and minor
pyrite (up to 1 mm).
***** VEINS/FRACTURES *****
1-2%, 0.3 mm filled with chlorite; 0.5-1 mm filled with mainly clay
minerals and subordinate chlorite (+ anhydrite?). Anhydrite on
fracture surface of Piece 8. No halos.
leg : 111 section: 01 unit/subunit : 0158
hole: 0504B top int: 61 cm observer code: KUE
core: 144R pieces : 10-13
rock name: MODERATELY TO HIGHLY PLAGIOCLASE-OLIVINE-CLINOPYROXENE
PHYRIC BASALT.
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 5-7 1-5 mm euhedral, tabular laths (< 1 mm
thick); fresh.
Olivine 2-3 0.5-1.5 mm subhedral, totally altered to
chlorite and pyrite.
Clinopyroxene 1-2 2-5 mm subhedral or elongated crystals
laths; fresh.
Generally homogeneous distribution; patchy distribution of olivine,
occurs in single crystals.
***** GROUNDMASS *****
Very fine grained (possibly slightly coarser toward bottom, Piece 13).
***** COLOR *****
Dark gray.
***** VESICLES *****
Nonvesicular.
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Generally slightly altered, olivine totally replaced by chlorite and pyrite
(< 1 mm); pyrite on fracture surface of Piece 13.
***** VEINS/FRACTURES *****
1%, 0.2 mm, horizontal and vertical fractures filled with clay
minerals, 2%, < 0.2 mm, 45 degree fracture filled with chlorite; < 0.2
mm, 2-3 mm lighter color alteration halo to both sides of fracture.
Piece 11- < 0.2 mm, filled with chlorite, dark alteration halo 2 mm
wide to each side of fracture. Piece 13- empty horizontal and vertical
fractures.
leg : 111 section: 01 unit/subunit : 0159
hole: 0504B top int: 95 cm observer code: KUE
core: 144R pieces : 14-16
rock name: APHYRIC BASALT
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
none
***** GROUNDMASS *****
Uniformly very fine grained.
***** COLOR *****
Dark gray.
***** VESICLES *****
Nonvesicular
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly altered.
***** VEINS/FRACTURES *****
Piece 15 - one prominent vein (< 0.5%, < 0.2 mm) filled with chlorite
(?) and clay minerals(?); light greenish gray halo (0.5 mm) of both
sides of fracture; conjugate shears, 1st and 2nd order, filled with
colorless mineral (anhydrite?).
leg : 111 section: 01 unit/subunit : 0160
hole: 0504B top int: 0 cm observer code: KUE
core: 145R pieces : 1-15
rock name: MODERATELY CLINOPYROXENE-PLAGIOCLASE-OLIVINE PHYRIC BASALT.
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1-3 0.5-3.0 mm subhedral to euhedral, fresh.
Olivine 1-2 0.5-3.0 mm subhedral, totally altered,
altered to chlorite, pyrite, talc
(?), mixed layer silicates,
hematite in five fractures in
Pieces 9B and 13A, layered
relationship with chlorite forming
center, talc and mixed layer/
silicates forming rim.
Clinopyroxene 2-5 1-10 mm Prismatic crystals, subhedral to
euhedral; fresh.
Varying distribution throughout the unit, increasing phenocryst
content 5-15% between Pieces 6-13B, all other pieces 5% unifrom
distribution, zonation in some crystals.
***** GROUNDMASS *****
Uniformly medium grained.
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly altered. Light green alteration halos, Pieces 1, 14A, and 14B up
to 4 cm wide; olivine altered as described above.
***** VEINS/FRACTURES *****
Pieces 3 and 14B, zeolites(?) on outer fracture surface. Piece 6: one
prominant fracture 2 mm wide, layered, filled first with zeolite (rim)
followed by chlorite and chalcopyrite (center); dark green alteration
halo 3-4 mm with light green alteration halo =0.8-1 cm. Piece 15:
fracture 2 mm wide, layered, filled with zeolite first (rim) followed
by chalcopyrite; 4 mm dark green alteration halo, horizontal to
subhorizontal fracture, minor vertical to subvertical,partly filled
with clay minerals(?)
leg : 111 section: 02 unit/subunit : 0160
hole: 0504B top int: 0 cm observer code: KUE
core: 145R pieces : 1-12
rock name: MODERATELY CLINOPYROXENE-PLAGIOCLASE-OLIVINE PHYRIC BASALT.
contact : n/a
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
Piece 7D:Olivine - up to 5 mm, less olivine than described for Unit
155. Piece 3: Clinopyroxene - less elongated, 2 x 5 mm. Piece 12B: Up
tp 12 mm (elongated,"broken"crystals). Large phenocrysts seem to be
orientated parallel to core axis.
***** GROUNDMASS *****
n/a
***** COLOR *****
n/a
***** VESICLES *****
n/a
***** STRUCTURE *****
n/a
***** ALTERATION *****
Pieces 7D and 7H: Irregular patches of lighter gray alteration.
***** VEINS/FRACTURES *****
n/a
leg : 111 section: 03 unit/subunit : 0160
hole: 0504B top int: 0 cm observer code: KUE
core: 145R pieces : 1-13
rock name: MODERATELY CLINOPYROXENE-PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : n/a
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
Clinopyroxene - up to 14 mm, partly broken crystals, orientation
parallel to core axis.
***** GROUNDMASS *****
n/a
***** COLOR *****
n/a
***** VESICLES *****
n/a
***** STRUCTURE *****
n/a
***** ALTERATION *****
Piece 6C: zeolite plus chalcopyrite with dark green alteration halo
(similar to that described in Unit 160, Pieces 6 and 15 (see also Unit 155)
). Piece 6G: Varied layering in alteration of olivine.
***** VEINS/FRACTURES *****
n/a
leg : 111 section: 01 unit/subunit : 0162
hole: 0504B top int: 0 cm observer code: KUE
core: 146R pieces : 1-4
rock name: MODERATELY PLAGIOCLASE-OLIVINE-PYROXENE PHYRIC BASALT.
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 4-6 up to 4 mm Single crystals to rarely
glomeroporphyritic, average= 2 mm;
fresh, subhedral crystals, no
really good euhedral crystals.
Olivine 3-4 up to 2 mm Glomeroporphyritic to less common
single crystals, average=1 mm,
altered to chlorite and pyrite
completely (in Piece 1, pyrite up
to 2 mm); anhedral.
Pyroxene 2 up to 2 mm Single crystals, subhedral, fresh.
Overall approximately 7-10%, vary from groundmass size up to 4 mm,
i.e. seriate porphyritic.
***** GROUNDMASS *****
Medium to fine grained, uniform throughout.
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive, texture is seriate porphyritic.
***** ALTERATION *****
Generally slightly altered. Olivines completely altered to chlorite and
pyrite. On outer surface of Piece 1: probably anhydrite.
***** VEINS/FRACTURES *****
"Insignificant" hairline fractures in Pieces 1 and 4: fil ed with dark
mineral (chlorite?).
leg : 111 section: 01 unit/subunit : 0163
hole: 0504B top int: 0 cm observer code: KUE
core: 147R pieces : 1-13
rock name: MODERATELY PLAGIOCLASE-OLIVINE-PYROXENE PHYRIC BASALT.
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase < 1 0.5-2 mm subhedral, fresh.
Olivine 1-2 1-2 mm subhedral, 100% altered to
chlorite + pyrite + possible talc.
Clinopyroxene 1 2-4 mm Subhedral, fresh.
1-3%, in total, uniformly distributed, plagioclase and olivine are
partly concentrated in Pieces 6A, 6C, and 13.
***** GROUNDMASS *****
Generally uniform medium grained; some slightly coarser grained patches of
plagioclase microlite concentration (+ olivine) and less mesostasis, in
Pieces 6A, 6C, and 13.
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly altered. Olivine completely altered to chlorite + pyrite +
possible talc.
***** VEINS/FRACTURES *****
Scarce veins (< 1 mm thick) filled with undetermined soft white
minerals, in Pieces 6C and 8E. Fractures mostly horizontal to
subhorizontal and vertical.
leg : 111 section: 02 unit/subunit : 0163
hole: 0504B top int: 0 cm observer code: KUE
core: 147R pieces : 1A-10
rock name: MODERATELY PLAGIOCLASE-OLIVINE-PYROXENE PHYRIC BASALT.
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase n/a Most 0.5-2.0
mm, some 4 mm,
Olivine n/a n/a As in Section 147R-1.
Clinopyroxene n/a n/a Most 2-4 mm, some up to 6 mm.
Same characteristics as in Section 147R-1.
***** GROUNDMASS *****
Similar to Section 147R-1.
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Generally slightly altered or completely altered to chlorite + pyrite +
possible talc.
***** VEINS/FRACTURES *****
More abundant than in Section 147R-1, mostly horizontal to sub
horizontal and vertical. Filled by same white mineral as 504B-147R-1.
leg : 111 section: 01 unit/subunit : 0164
hole: 0504B top int: 0 cm observer code: KUE
core: 148R pieces : 1-20
rock name: MODERATELY PLAGIOCLASE-CLINOPYROXENE-OLIVINE PHYRIC BASALT
contact : None
***** MAIN COMMENTS *****
Note: 504B-148R-1, Piece 2, contains abundant Fe-oxides and is probably
debris from the Upper pillow section. 504B-148R-1, Piece 3, has radius of
curvature similar to outside of drill bit and may be debris that fell into
the bottom of the hole. Note that two round trips of pipe occurred
immediately before this core was taken.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 2 1-4 mm euhedral, tabular; fresh.
Clinopyroxene 2 1-5 mm euhedral, prismatic, fresh.
Olivine < 1 1-2 mm concentrated in 148R-1 Piece 3 (=
2%), subhedral, replaced by
chlorite and pyrite.
3-4 % total, concentrated in 504B-148R-1, Pieces 3 and 5, gradually
decreasing abundance downward. Reaching= 1-2%, beginning with 504B-
148R-1, Piece 20.
***** GROUNDMASS *****
Generally uniformly fine grained, coarser patches in 504B-148R-1, Pieces 1
and 4, 1-5 mm patches of concentrated plagioclase throughout.
***** COLOR *****
Dark gray.
***** VESICLES *****
Irregular mm-sized vugs in 504B-148R-1, Pieces 1 and 4, filled with
chlorite.
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Olivine replaced by chlorite and pyrite. Generally slightly altered. Light
gray alteration patches around small chlorite-filled vugs in 504B-148R-1,
Pieces 1 and 4.
***** VEINS/FRACTURES *****
< 1%, < 0.5 mm, filled with chlorite (90%) and pyrite (6%), and
unidentified white mineral (4%) of uncertain relationship. White
mineral veins most common in 504B-148R-2. Veins predominantly
horizontal and vertical.
leg : 111 section: 01 unit/subunit : 0164
hole: 0504B top int: 20 cm observer code: KUE
core: 149R pieces : 148R-1, Piece 4, to 149R-2, 7
rock name: SPARSELY PLAGIOCLASE-CLINOPYROXENE-OLIVINE PHYRIC BASALT.
contact : None
***** MAIN COMMENTS *****
Veins/fractures continued: 504B-149R-1, Piece 7: White (anhydrite?) mineral
in vein plus chlorite. 504B-149R-2, Piece 2B: Sulfides on broken surface.
Light greenish gray. 504B-149R-2, Pieces 6 and 7: < 1 mm wide, = 1% fo
rock, alteration in halos. 1.5 mm wide veins filled by chlorite (rim) with
whitish anhydrite mineral (center) zeolites. Piece 6: Late phase 1 mm wide
chlorite-filled vein plus pyrite (no halo) crosscuts with other veins and
halos.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase < 1 1-4 mm euhedral, tabular, fresh.
Clinopyroxene ~1 1-6 mm euhedral, prismatic, fresh.
Olivine < 0.5 0.5-2 mm subhedral, replaced by chlorite
and pyrite.
~1-2% total, homogeneous distribution. < 1% to aphyric in 504B-149R-2,
Pieces 6 and 7.
***** GROUNDMASS *****
Unifromly fine grained, becoming very fine grained in 504B-149R-2, Pieces 6
and 7.
***** COLOR *****
Dark gray.
***** VESICLES *****
Absent
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Generally slightly altered; olivine altered to chlorite and pyrite.
Alteration halos in 504B-149R-2, Piece 6 and 7 (see below).
***** VEINS/FRACTURES *****
< 1%, < 0.5 mm (except 504B-149R-2, Pieces 6 and 7). Numerous
subhorizontal to horizontal and subverticalto vertical fractures. Open
fractures mainly filled with white mineral. Mineralized with chlorite
and pyrite. See Comments
leg : 111 section: 01 unit/subunit : 0165
hole: 0504B top int: 0 cm observer code: KUE
core: 150R pieces : 1-11
rock name: SPARSELY CLINOPYROXENE-OLIVINE-PLAGIOCLASE PHYRIC BASALT
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase < 1 1-2 mm subhedral, fresh.
Clinopyroxene 1 1-5 mm in Piece euhedral prismatic to subhedral,
11. fresh.
Olivine 1 1-3 mm subhedral, replaced by chlorite +
talc + pyrite in Piece 2.
1-2% homogeneous distribution, up to 4% in Piece 11 at bottom of unit.
***** GROUNDMASS *****
Uniformly medium grained.
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly altered. Olivine altered to chlorite + talc +pyrite (from center
to rim and also reverse relationship and mixed).
***** VEINS/FRACTURES *****
Piece 7A: subperpendicular pattern of fractures (< 1 mm), filled with
white alteration mineral.
leg : 111 section: 01 unit/subunit : 0166
hole: 0504B top int: 54 cm observer code: KUE
core: 150R pieces : 12-13
rock name: APHYRIC BASALT
contact : None
***** MAIN COMMENTS *****
None
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase < 1 up to 2 mm subhedral-euhedral, fresh.
Olivine 1 0.5-3.0 mm euhedral to subhedral 100% altered
to chlorite + talc + pyrite (at
rims of altered olivine) +
hematite (in fractures of olivine)
.
Clinopyroxene < 1 < 1-1 mm subhedral, fresh.
2%, homogeneous distribution.
***** GROUNDMASS *****
Very fine grained.
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly altered. See olivine above. Light green alteration halos around
chlorite-filled vugs in Piece 13.
***** VEINS/FRACTURES *****
None
leg : 111 section: 01 unit/subunit : 0167
hole: 0504B top int: 60 cm observer code: KUE
core: 150R pieces : 14-23
rock name: APHYRIC TO SPARSELY (PIECE 19) OLIVINE-CLINOPYROXENE (-
PLAGIOCLASE) PHYRIC BASALT.
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase n/a n/a <1%
Clinopyroxene 1 0.5-3.0 mm subhedral to euhedral, fresh.
Olivine 1 0.5-4.0 mm subhedral to euhedral, altered to
chlorite + talc + pyrite (in
varying relationship).
1-2%, partly homogeneous distribution. In Pieces 20C-22J,
concentration of olivine in patches.
***** GROUNDMASS *****
Medium grained.
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly altered, olivine completely altered. Piece 14: fibrous white
alteration mineral (anhydrite?) on outer surface, coated with green
material.
***** VEINS/FRACTURES *****
Piece 19: < 1 mm, filled with white and light green alteration
products. Piece 22C-22D: < 1 mm, filled with white alteration mineral,
partly light gray alteration halo.
leg : 111 section: 01 unit/subunit : 0168
hole: 0504B top int: 0 cm observer code: KUE
core: 151R pieces : 1-8
rock name: SPARSELY CLINOPYROXENE-OLIVINE PHYRIC BASALT
contact : None observed
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase n/a n/a
Olivine 1.5 0.2-1.0 mm euhedral single crystals replaced
by chlorite + or - pyrite
Clinopyroxene 1.5 1-4 mm euhedral prismatic crystals
(single), fresh.
~3%, fairly uniformly distributed, but apparently more in Pieces 1-3.
***** GROUNDMASS *****
Uniformly fine grained with mm-sized patches of feldspar (more clEarly in
Piece 8).
***** COLOR *****
Uniformly dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly altered; olivine totally replaced by chlorite/pyrite.
***** VEINS/FRACTURES *****
In Pieces 1 and 8 only; rare in Piece 1: horizontal hairline vein
filled with unidentified white mineral (quartz?). In Piece 8,
hairline open fracture and hairline veins (quartz?). No alteration
halos.
leg : 111 section: 01 unit/subunit : 0169
hole: 0504B top int: 0 cm observer code: KUE
core: 152R pieces : 1-2
rock name: SPARSELY PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : chilled against Unit 170. Dip = 70 degrees. Azimuth = 45
degrees.
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase < 1 0.2-0.5 mm euhedral, fresh.
Olivine < 1 0.2-0.4 mm euhedral, replaced by chlorite.
< 1% total, concentrated at contact; mm-sized xenoliths of Unit 170
included in Piece 2 (working half only).
***** GROUNDMASS *****
Very fine grained throughout.
***** COLOR *****
Dark gray grading to light gray within 5 mm of contact.
***** VESICLES *****
None
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly altered. Olivine replaced by chlorite. 0.5 mm light gray
alteration halos around veinlets. White - light gray alteration within 5 mm
of contact, grades - dark gray.
***** VEINS/FRACTURES *****
< 1% of unit, = 0.2 mm wide, filled with chlorite (90%) plus white
mineral (10%). No relationship observed.
leg : 111 section: 01 unit/subunit : 0170
hole: 0504B top int: 5 cm observer code: KUE
core: 152R pieces : 2-3
rock name: MODERATELY PLAGIOCLASE-OLIVINE PHYRIC BASALT
contact : Unit 169 chilled against Unit 170. Therefore, relationships
as above.
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 2-3 2-3 mm rounded-subhedral.
Olivine 2-3 0.8-3 mm euhedral, replaced by chlorite.
5% total, uniform distribution. No apparent pyroxene.
***** GROUNDMASS *****
Fine to medium grained, patchy grain size. Variation picked out by
alteration.
***** COLOR *****
Dark greenish gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Moderately to strongly altered. Olivine replaced by chlorite. Common
disseminated pyrite. Patchy chloritization results in "graphic" appearance,
giving each a more coarse-grained look than it actually has.
***** VEINS/FRACTURES *****
1% vertical chlorite veins in Piece 2, 0.5-1 mm wide. 1% white
prismatic mineral (laumontite) on fracture surfaces.
leg : 111 section: 01 unit/subunit : 0171
hole: 0504B top int: 25 cm observer code: KUE
core: 152R pieces : 4-6
rock name: MODERATELY PLAGIOCLASE-CLINOPYROXENE-OLIVINE PHYRIC BASALT.
contact : None visible, but Piece 6 grades to very fine grained,
probably chilled zone.
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 2 0.5-1 mm subhedral, fresh.
Olivine 1-2 0.5-1 mm subhedral, replaced by chlorite
and trace pyrite.
Clinopyroxene 2 1-5 mm euhedral prismatic, fresh.
3% to 5%, uniformly distributed, single crystals.
***** GROUNDMASS *****
Very fine grained throughout, finer at edge of Piece 6.
***** COLOR *****
Uniformly dark gray, except for chilled zone of Piece 6.
***** VESICLES *****
None
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly altered throughout, olivine replaced by chlorite.
***** VEINS/FRACTURES *****
One hairline fracture filled with unidentified white mineral in Piece
6. Piece 5 has = 0.5 mm chlorite vein with 1-2 mm wide lighter gray
alteration halo.
leg : 111 section: 01 unit/subunit : 0172
hole: 0504B top int: 40 cm observer code: KUE
core: 152R pieces : 7-9
rock name: MODERATELY OLIVINE-PLAGIOCLASE-CLINOPYROXENE PHYRIC BASALT.
contact : Top not observed, breccia chilled against Unit 172, Piece
10.
***** MAIN COMMENTS *****
Note: Breccia matter is essentially hyaloclastic, glass shards +
clinopyroxene + plagioclase + quartz + laumo tite + mixed clays/chlorite.
Fragments are very fine-gained chill margin; they look very much like chill
of Unit 174.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 3 0.5-2 mm euhedral, single crystals, fresh.
Olivine 4 0.2-3 mm euhedral to subhedral, single
crystals to glomerocrysts,
replaced by chlorite and pyrite.
Clinopyroxene 3 0.5-2 mm euhedral, fresh.
10% total, overall uniformly distributed, but olivine is locally
concentrated within Piece 7.
***** GROUNDMASS *****
Generally uniformly fine grained; Piece 10 very fine grained to glassy.
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive, Piece 10 contains contact breccia, with fragments of Unit 172
included within chilled material.
***** ALTERATION *****
Slightly altered throughout; olivine replaced by chlorite and pyrite.
***** VEINS/FRACTURES *****
< 1%, vertical hairline fractures and veinlets filled with chlorite in
Piece 7.
leg : 111 section: 01 unit/subunit : 0173
hole: 0504B top int: 60 cm observer code: KUE
core: 152R pieces : 10-13
rock name: MODERATELY OLIVINE-PLAGIOCLASE-CLINOPYROXENE PHYRIC BASALT.
contact : Exposed in Piece 12, intruded by Unit 174. Contact quite
irregular, general azimuth 090, dip ~ vertical. Unit 173 is
not chilled.
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Olivine 3 0.5-2 mm euhedral-subhedral, altered to
chlorite and pyrite.
Plagioclase < 1 1 mm euhedral, fresh.
Clinopyroxene < 1 0.5-1 mm euhedral, short crystals, fresh.
4-5%, uniform distribution, single crystals.
***** GROUNDMASS *****
Fine grained, uniform.
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Fairly massive - incipient brecciation.
***** ALTERATION *****
Strongly altered. Considerable groundmass chlorite and pyrite. Olivines
completely altered. Minor amounts of laumontite ( + prehnite? ) in
microfractures and small vugs (?)
***** VEINS/FRACTURES *****
Numerous microfractures in Piece 12: = 1 mm and up to 1 cm long,
parallel to core axis, impart a weak fabric. Fractures filled with
chlorite + laumontite (?) + prehnite (?) + minor pyrite. Piece 11:
microfractures are very irregular, approaching almost brecciated
structure. Filled with white mineral (laumontite?) + prehnite(?) +
minor pyrite.
leg : 111 section: 01 unit/subunit : 0174
hole: 0504B top int: 74 cm observer code: KUE
core: 152R pieces : 12 & 16(out-of-place fragment)
rock name: MODERATELY PLAGIOCLASE-CLINOPYROXENE-OLIVINE PHYRIC BASALT
contact : Intrusive contact; irregular and chilled versus Unit 173.
Average azimuth 90 degrees and dip = vertical.
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 5 0.2-3 mm subhedral to euhedral, single
crystals and glomerocrysts, fresh.
Olivine 2 0.2-1.5 mm euhedral, single crystals,
replaced by chlorite and pyrite.
Clinopyroxene 3 1-6 mm subhedral, single crystals and
glomerocrysts with plagioclase,
fresh.
10% total, less abundant within 5-10 mm of contact.
***** GROUNDMASS *****
Very fine grained, chilled contact.
***** COLOR *****
Medium gray, altered to light gray to greenish within 5-10 mm of contact.
***** VESICLES *****
None
***** STRUCTURE *****
Chilled dike margin, irregular contact: apophyses of Unit 174 penetrate
into Unit 173 and mm-sized xenoliths of Unit 173 are incorporated into Unit
174.
***** ALTERATION *****
Slightly altered, olivine replaced by chlorite, light gray coloration
within 5-10 mm of contact.
***** VEINS/FRACTURES *****
< 1%, 0.2-0.5 mm, horizontal veinlets with unidentified white mineral.
leg : 111 section: 01 unit/subunit : 0175
hole: 0504B top int: 90 cm observer code: KUE
core: 152R pieces : 14-15 and 17-20
rock name: MODERATELY CLINOPYROXENE-OLIVINE-PLAGIOCLASE PHYRIC BASALT
contact : Not observed.
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1 up to 1 mm euhedral, single crystals, fresh.
Olivine 2-3 0.2-2 mm euhedral to subhedral, single
crystals, replaced by chlorite and
minor pyrite.
Clinopyroxene 3 up to 2 mm euhedral, single crystals, fgresh.
7%, fairly evenly distributed.
***** GROUNDMASS *****
Fine grained in Pieces 14-15 and 17-18, grading to very fine grained in
Pieces 19-20.
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly altered. Olivine replaced by chlorite.
***** VEINS/FRACTURES *****
Piece 20: subhorizontal veins, < 0.5 mm, ~ 0.5% of Piece 20, filled
with unidentified white mineral.
leg : 111 section: 01 unit/subunit : 0176
hole: 0504B top int: 0 cm observer code: KUE
core: 153R pieces : 153R-1, 1-22, and 153R-2, 1-15
rock name: SPARSELY OLIVINE-CLINOPYROXENE-PLAGIOCLASE PHYRIC BASALT
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1 0.5-1.5 mm subhedral, fresh(?).
Clinopyroxene 1-2 1-8 mm euhedral-subhedral (prismatic),
fresh.
Olivine 1-3 0.5-2.5 mm subhedral to euhedral, 100%
altered to chlorite + mixed-layer
clays + talc + pyrite.
3% in 153R-2, Piece 14 and 6% in 153R-1, Piece 14; generally
homogeneous, olivine shows a less uniform distribution.
***** GROUNDMASS *****
Throughout uniformly fine grained, becoming slightly finer grained toward
bottom of core (153R-2, Pieces 13-15).
***** COLOR *****
Dark gray.
***** VESICLES *****
Absent
***** STRUCTURE *****
Massive
***** ALTERATION *****
Slightly altered throughout. Olivine is totally altered by chlorite +
mixed-layer clays + talc + pyrite in varying abundance (but dominantly
chlorite) and related patches (2-4 cm diameter) of lighter greenish gray
alteration color, e.g., 153R-1, Pieces 10 and 14, and 153R-2, Piece 1.
***** VEINS/FRACTURES *****
Mainly subvertical fractures, < 0.2 mm, filled with white mineral
(laumontite?). Laumontite on fracture surfaces of 153R-1, Pieces 9A,
10, 13, and 17; and 153R-2, Piece 7.
leg : 111 section: 01 unit/subunit : 0176
hole: 0504B top int: 0 cm observer code: KUE
core: 154R pieces : 1-12
rock name: MODERATELY CLINOPYROXENE-OLIVINE-PLAGIOCLASE PHYRIC BASALT.
contact : None
***** MAIN COMMENTS *****
Pieces 8-12 show strong Fe-hydroxide staining (due to drilling?).
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase < 1 0.5-1.5 mm euhedral-subhedral, fresh.
Clinopyroxene 2-3 1-7 mm euhedral laths, fresh.
Olivine 1-2 0.5-2 mm subhedral, totally altered to
chlorite + pyrite + talc/mixed-
layer clay(?)
1-5% total; < 1% in Pieces 6B, 8, and 9; 5% in Piece 4B; generally
homogeneous except olivine (less uniform distribution).
***** GROUNDMASS *****
Fine grained, becoming slightly finer grained toward bottom of section.
***** COLOR *****
Dark gray
***** VESICLES *****
Absent
***** STRUCTURE *****
Massive
***** ALTERATION *****
Slightly altered, patches of lighter green gray alteration, center shows
advanced chloritization (e.g., Pieces 4C and 7).
***** VEINS/FRACTURES *****
Piece 7 - 0.5-1 mm wide fracture, subhorizontal, filled by (1)
prehnite (?) in center and (2) chlorite lining fracture. Lighter
greenish gray alteration halo of 2-3 mm in total (cross). Hairline
fractures, subhorizontal and subvertical, filled by white mineral
(laumintite?). Laumintite on outer surface (fractures) of Pieces 5 and
6.
leg : 111 section: 01 unit/subunit : 0176
hole: 0504B top int: 0 cm observer code: KUE
core: 155R pieces : 1-14
rock name: MODERATELY CLINOPYROXENE-OLIVINE-PLAGIOCLASE PHYRIC BASALT.
contact : None observed.
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1 1-2 mm subhedral, fresh.
Olivine 2 0.5-1 mm subhedral, replaced by chlorite
and pyrite.
Clinopyroxene 2 1-4 mm euhedral, fresh.
5% total, single crystals, uniformly distributed.
***** GROUNDMASS *****
Uniformly fine grained.
***** COLOR *****
Dark gray.
***** VESICLES *****
Irregular mm-sized vugs filled with chlorite in Pieces 2 and 8.
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly altered. Olivine replaced by chlorite and pyrite; cm-sized light
gray alteration halos around chlorite-filled vugs in Pieces 2 and 8.
***** VEINS/FRACTURES *****
Open horizontal hairline cracks, < 1%, in Pieces 7b and 8. Similar
vertical crack in Piece 12. < 1% fine veinlets (<0.5 mm) filled with
chlorite and unidentified white mineral in Pieces 2, 7, 8, and 14. No
relationship observed.
leg : 111 section: 01 unit/subunit : 0177
hole: 0504B top int: 0 cm observer code: KUE
core: 156R pieces : 1-8 and 10-12
rock name: APHYRIC TO SPARSELY PLAGIOCLASE-OLIVINE PHYRIC BASALT.
contact : Not observed.
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1 0.2-1 mm subhedral, fresh.
Olivine < 1 0.2-0.5 mm subhedral, replaced by chlorite.
Clinopyroxene n/a n/a
1%, single crystals. Generally uniformly distributed. but plagioclase
more abundant in Piece 12.
***** GROUNDMASS *****
Grading from very fine grained in Piece 1 to fine grained in Piece 12.
***** COLOR *****
Gray to greenish gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive. Close to chilled margin at top of section, small amount of another
unit chilled against Unit 177 in Pieces 1 and 2.
***** ALTERATION *****
Slightly to moderately altered, olivine replaced by chlorite; very fine
grained; Pieces 1 and 2 altered to light gray color. Diffuse 5 mm greenish
gray alteration halos around chlorite vein in Piece 12.
***** VEINS/FRACTURES *****
Unoriented veins, 1%, 0.2-1 mm, filled with chlorite (80%), pyrite (1%
), epidote (?) (1%), and white mineral (quartz?) (18%). White mineral
appears to have formed later than chlorite.
leg : 111 section: 01 unit/subunit : 0178
hole: 0504B top int: 41 cm observer code: KUE
core: 156R pieces : 9 and 13
rock name: SPARSELY PLAGIOCLASE-CLINOPYROXENE-OLIVINE PHYRIC BASALT.
contact : Not observed.
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1 1-2 mm subhedral, fresh.
Olivine < 1 0.5-2 mm subhedral, replaced by chlorite.
Clinopyroxene 1 1-3 mm euhedral, fresh.
Total = 2%, clinopyroxene concentrated in Piece 13, single crystals.
***** GROUNDMASS *****
Fine grained.
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Generally slightly altered, olivine replaced by chlorite. Greenish gray
alteration patches and 1-2 mm-wide halos around fine chlorite veinlets (<
0.5 mm) in Piece 13.
***** VEINS/FRACTURES *****
1%, < 0.5 mm, filled with chlorite, all in Piece 13 (unoriented).
leg : 111 section: 01 unit/subunit : 0179
hole: 0504B top int: 68 cm observer code: KUE
core: 156R pieces : 156R-1,14, to 157R-1,1
rock name: MODERATELY PYROXENE-OLIVINE PLAGIOCLASE PHYRIC BASALT.
contact : None visible.
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Olivine 2 0.5-2 mm euhedral-subhedral, altered to
chlorite plus hm (in fractures of
olivine).
Clinopyroxene 3 0.5-1.5 mm euhedral-subhedral, fresh.
Plagioclase < 1 ~ 1 mm subhedral, fresh.
~ 6%, uniformly distributed.
***** GROUNDMASS *****
Uniformly fine grained.
***** COLOR *****
Dark greenish gray.
***** VESICLES *****
No vesicles.
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly altered. Olivine completely altered to chlorite plus Fe-oxide (hm)
. Thin (= 1 mm) light gray alteration halos around altered olivine.
***** VEINS/FRACTURES *****
None visible.
leg : 111 section: 01 unit/subunit : 0179
hole: 0504B top int: 0 cm observer code: KUE
core: 157R pieces : 1
rock name: SPARSELY OLIVINE-PLAGIOCLASE-CLINOPYROXENE PHYRIC BASALT.
contact : None (possible, see below).
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1 0.5 mm subhedral, fresh.
Clinopyroxene < 1 1-2 mm euhedral, fresh.
Olivine 1 1-2 mm subhedral, totally altered to
chlorite + Fe-hydroxides + talc/
mixed-layer clays.
2-3%, homogeneous distribution, single crystals.
***** GROUNDMASS *****
Very fine grained.
***** COLOR *****
Dark gray.
***** VESICLES *****
Absent.
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly to moderately (in veins) altered; olivine totally altered (see
above).
***** VEINS/FRACTURES *****
About 10% abundance. (1) Two veins, both about 1.5 mm wide, filled by
chlorite with a 0.5 mm light greenish gray halo (possibly chilled
contact). (2) Regular, sub-parallel, up to 1.5 mm wide, filled by a
mixture of chlorite and mixed-layer clays(?) with light greenish gray
halos up to 3 mm wide.
leg : 111 section: 01 unit/subunit : 0180
hole: 0504B top int: 6 cm observer code: KUE
core: 157R pieces : 2 and 3
rock name: APHYRIC BASALT.
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase << 1 0.5-4 mm euhedral, fresh.
Clinopyroxene n/a n/a Absent.
Olivine < 1 0.5-1.5 mm subhedral, altered to chlorite +
pyrite + talc/mixed-layer clays (?
).
1%, homogeneous distribution, single crystals.
***** GROUNDMASS *****
Fine grained.
***** COLOR *****
Dark gray.
***** VESICLES *****
Absent.
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly altered. Olivine totally altered (see above). Laumontite + sulfide
on fracture surfaces. Alteration halo approximately 5 mm, light greenish
gray on Piece 2.
***** VEINS/FRACTURES *****
Piece 2: << 1%, hairline fractures, filled by light greenish gray
irregular mixture of chlorite + mixed-layer clays + prehnite (?).
leg : 111 section: 01 unit/subunit : 0181
hole: 0504B top int: 20 cm observer code: KUE
core: 157R pieces : 4-15
rock name: APHYRIC TO SPARSELY CLINOPYROXENE-OLIVINE-PLAGIOCLASE PHYRIC
BASALT.
contact : None
***** MAIN COMMENTS *****
Veins/fractures continued: ...around adjacent altered olivine. 3.Pieces 8
and 14 show up to 1 mm wide fractures, filled by pale green mineral
(prehnite?) with dark green alteration halos up to 2 mm; Piece 8 shows
white alteration minerals on outer surface, possibly crosscutting the
prehnite veins. 4. Piece 5: Complex light greenish gray alteration pattern,
may represent some sort of brecciation. = 1 mm wide veins filled by
chlorite and light gray mineral (actinolite?) crosscut altered brecciated
zone, = 1 mm wide veins filled by laumontite (?) crosscut altered
brecciated zone, no alteration halos, irregular dark green patch (thin
section).
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase << 1 0.5-1 mm subhedral, fresh.
Clinopyroxene 1 0.5-1.5 mm subhedral, fresh. 1% in Piece 3
Olivine 1 0.5-1 mm subhedral, mainly altered to
chlorite + sulfide + talc in Piece
5, light greenish gray alteration
halos (diameter 1.5 mm)
surrounding olivine.
Varying from 2% in Pieces 1, 10, and 13 to aphyric in Pieces 14 and 15
toward bottom of section; single crystals; olivine singly and as
glomerocryst, Piece 5.
***** GROUNDMASS *****
Varies from very fine grained in Piece 5, to fine grained in Pieces 8 and
9, to very fine grained in Pieces 13 and 14. Piece 5: variable texture,
coarse-grained patches.
***** COLOR *****
Dark gray.
***** VESICLES *****
Absent.
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slight to moderate in Pieces 5, 13, and 14; olivine totally altered (see
above). laumontite on outer surfaces of Pieces 5 and 6.
***** VEINS/FRACTURES *****
1.Hairline fracture on all pieces: (a)filled by chlorite with < 1 mm
alteration halos. (b)crosscutting the first set (e.g. Piece 15),
filled by light greenish gray mineral (actinolite?), without
alteration halos. 2.Piece 13: 2-mm-wide fracture filled by (a)pale
green mineral (prehnite?) in center, followed outward by (b)dark green
mineral (chlorite) and (c)dark green alteration halo, and (d)an up to
2 mm wide light gray alteration halo, which is also developed... See
comments
leg : 111 section: 01 unit/subunit : 0182
hole: 0504B top int: 0 cm observer code: KUE
core: 158R pieces : 1-7, Piece 2 not in order.
rock name: APHYRIC BASALT
contact : None
***** MAIN COMMENTS *****
Veins/fractures continued... from this vein ~45 degrees, filled by chlorite
and/or white mineral (about 0.5 mm thick); crosscutting the fractures type
1. Piece 3B - contains a series of parallel fractures, <1 mm, filled with
chlorite (type 1), about 10% abundance; crosscutting veins; type 2 (filled
with white mineral). Piece 4 - shows complex fracturing, probably some sort
of brecciation. Mainly chlorite-filled veins up to 4 mm. About 4-mm light
greenish gray alteration halos, also dark gray alteration halo of chlorite-
filled vein, sulfides and chlorite on outer fracture surface.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase < 1 up to 3 mm euhedral, fresh.
Clinopyroxene < 1 up to 2 mm. euhedral (prismatic), fresh.
Olivine < 1 1 mm anhedral, altered to chlorite +
pyrite + talc/mixed-layer clays(?)
.
Aphyric, except Pieces 6 and 7 < 1%. Homogeneous distribution.
***** GROUNDMASS *****
Uniformly very fine grained, except Piece 2, which is fine grained.
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Piece 4: slightly to moderately altered. Piece 2: disseminated pyrite, <
0.3 mm, << 1%, no fractures present here.
***** VEINS/FRACTURES *****
1. Subvertical fractures, up to 0.5 mm, filled by white mineral
(laumontite?) and chlorite (Pieces 3A and 7), or only by chlorite
(Piece 6). Chlorite-filled fractures show light gray halos up to 2 mm.
2. Horizontal to subhorizontal fractures crosscutting type 1. Piece 3A
- <1-mm-wide fracture, filled by (a) white mineral (~0.2 mm) in the
center, followed by (b) chlorite, lining the fracture. Weak, very
light gray alteration halo of about 2 mm each side, conjugate
sheers......See comments
leg : 111 section: 01 unit/subunit : 0183
hole: 0504B top int: 0 cm observer code: KUE
core: 159R pieces : 1-8
rock name: MODERATELY PLAGIOCLASE-OLIVINE-CLINOPYROXENE PHYRIC BASALT.
contact : In Piece 8, Unit 184 is "chilled" against 183; see Unit 184
for details.
***** MAIN COMMENTS *****
Note: Piece 4- Phenocrysts: Aphyric. Groundmass: Fine grained. Color: Dark
gray. Alteration: Slightly altered. Vein/fractures: Absent.
***** PHENOCRYSTS *****
phenocryst name % size description
Olivine 1 up to 1 mm subhedral-euhedral, 100% altered
to chlorite + pyrite + talc(?).
Plagioclase 4 1-3 mm subhedral, fresh.
Clinopyroxene < 1 up to 6 mm subhedral, fresh.
Approximately 5% total. Homogeneous distribution. Single crystals.
***** GROUNDMASS *****
Uniformly fine to medium fine grained.
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
massive.
***** ALTERATION *****
Slightly altered. Olivine completely altered (see above). Fine diseminated
pyrite (< 0.25 mm diameter).
***** VEINS/FRACTURES *****
Rare, < 0.5 mm hairline, filled by gray-white mineral (e.g. Piece 2).
leg : 111 section: 01 unit/subunit : 0184
hole: 0504B top int: 43 cm observer code: KUE
core: 159R pieces : 8-10
rock name: APHYRIC BASALT.
contact : Piece 8: Irregular contact (no clear orientation, piece is
elongate roller). Contact is not chilled; no glass present,
but Unit 184 very fine grained compared to fine-medium grain
of Unit 183.
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
Aphyric.
***** GROUNDMASS *****
Uniformly fine to very fine grained.
***** COLOR *****
Dark gray.
***** VESICLES *****
None.
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly altered. Piece 9 has dark gray patches rimmed by lighter gray
alteration halos ~ 3-4 mm wide.
***** VEINS/FRACTURES *****
< 1 mm, << 1%, greenish gray mineral and very rare white mineral and
sulfides fill veins. Very closely spaced fractures in Pieces 9 and 10.
leg : 111 section: 01 unit/subunit : 0185
hole: 0504B top int: 0 cm observer code: KUE
core: 160R pieces : 1-2 and 4-6.
rock name: APHYRIC BASALT.
contact : None observed.
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Clinopyroxene < 1 1-3 mm subhedral, fresh.
Essentially aphyric; < 1% total. Phenocrysts evenly distributed.
***** GROUNDMASS *****
Fine grained (uniform).
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive. Small chilled dykelet cutting 185 in Piece 6, ~ 5 mm wide.
***** ALTERATION *****
Light gray alteration halos = 3 mm wide around veins and around dykelet in
Piece 6.
***** VEINS/FRACTURES *****
Less than 1%, 2 mm wide, quartz-filled vein in Piece 2; 1 mm chlorite
vein in Piece 1. Sparse pyrite and chlorite on margins of dykelet.
Quartz vein running parallel to margin of dykelet.
leg : 111 section: 01 unit/subunit : 0186
hole: 0504B top int: 37 cm observer code: KUE
core: 160R pieces : 7-10
rock name: APHYRIC BASALT.
contact : None observed.
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase < 1 0.5-3 mm euhedral, partially altered to ?
in centers.
Less than 1% overall, evenly distributed.
***** GROUNDMASS *****
Very fine grained (more than Unit 185).
***** COLOR *****
Dark gray.
***** VESICLES *****
None.
***** STRUCTURE *****
Massive.
***** ALTERATION *****
2 mm light gray alteration halos around veins in Pieces 9 and 10. Sparse
pyrite in Piece 3.
***** VEINS/FRACTURES *****
< 1%, 0.5-mm-wide chlorite-filled veins in Pieces 9 and 10.
Plagioclase phenocrysts partly altered to chlorite(?) in cores.
leg : 111 section: 01 unit/subunit : 0187
hole: 0504B top int: 0 cm observer code: KUE
core: 161R pieces : 1-11
rock name: MODERATELY PLAGIOCLASE-CLINOPYROXENE-OLIVINE PHYRIC BASALT.
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Olivine < 1 up to 2 mm subhedral, completely altered to
chlorite + pyrite + talc + mixed-
layer clays.
Clinopyroxene < 1 up to 6 mm euhedral (prismatic), fresh.
Plagioclase 3 1-5 mm euhedral (laths), fresh.
3% in total, homogeneous distribution, except olivine is more common
at the top (Piece 1). Single crystals.
***** GROUNDMASS *****
Uniformly medium grained but patches of coarser material in Piece 1.
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly altered. Olivine 100% altered (see above).
***** VEINS/FRACTURES *****
< 1%, Pieces 2, 3, 7, and 8: < 0.5 mm, filled by chlorite in Piece 2
and pale green mineral actinolite(?) in Pieces 2, 7, and 8; irregular
dark gray 2 mm halo followed outward by 3 mm irregular light gray
halo. Piece 11: 0.5 mm vein, filled by greenish gray mineral.
leg : 111 section: 01 unit/subunit : 0187
hole: 0504B top int: 0 cm observer code: KUE
core: 162M pieces : 1
rock name: APHYRIC BASALT, MOST LIKELY FROM BELOW 900 MBSF.
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
None, Aphyric.
***** GROUNDMASS *****
Fine grained.
***** COLOR *****
Greenish gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Uniformly slightly altered to greenish gray color.
***** VEINS/FRACTURES *****
None
leg : 111 section: 01 unit/subunit : 0187
hole: 0504B top int: 11 cm observer code: KUE
core: 162M pieces : 2, 3, 5, 6, and 7
rock name: MODERATELY TO HIGHLY OLIVINE-PLAGIOCLASE +/- CLINOPYROXENE
PHYRIC BASALT.
contact : None.
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1-8 0.5-1 mm subhedral, glomerocrysts and
single crystals, fresh.
Olivine 3-15 0.2-3 mm subhedral, single crystals and
glomerocrysts, replaced by
smectite, Fe-oxide, calcite.
Clinopyroxene < 1 0.5-1 mm mostly in Piece 6, subhedral,
fresh.
10-20% total.
***** GROUNDMASS *****
Fresh, fine grained.
***** COLOR *****
Gray.
***** VESICLES *****
percent: < 5
size: 0.5-2 mm
shape: Rounded
distribution: Found mostly in Piece 7
Filled with smectite and calcite.
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly altered. Olivine replaced by smectite and calcite. 1-20-mm-wide
reddish oxidation halos around some fractures (1 cm wide). Dark gray
(black) alteration halo around outer surfaces of Piece 5.
***** VEINS/FRACTURES *****
None observed.
leg : 111 section: 01 unit/subunit : 0187
hole: 0504B top int: 35 cm observer code: KUE
core: 162M pieces : 4, 8, and 9
rock name: MODERATELY PLAGIOCLASE-OLIVINE + CLINOPYROXENE PHYRIC
BASALT.
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1-5 0.5-3 mm subhedral single crystals, fresh.
Olivine 1-4 0.5-2 mm single crystals and glomerocrysts,
replaced by clays and pyrite.
Clinopyroxene 1-2 1-2 mm subhedral, single crystals, fresh.
5-10% total.
***** GROUNDMASS *****
Fine grained.
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly altered. Olivine replaced by clays and pyrite.
***** VEINS/FRACTURES *****
< 1%, hairline crack filled with white stuff in Piece 4B, hairline
crack filled with clay and pyrite in Piece 9A.
leg : 111 section: 01 unit/subunit : 0187
hole: 0504B top int: 0 cm observer code: KUE
core: 163R pieces : 1-27c
rock name: MODERATELY PLAGIOCLASE-OLIVINE-CLINOPYROXENE PHYRIC BASALT.
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Olivine 2 1-3 mm subhedral, 100% altered to
chlorite + pyrite + talc.
Plagioclase 3-5 1-7 mm euhedral to subhedral, fresh, but
altered in Pieces 15-18 and 25-26.
Clinopyroxene < 1 up to 5 mm subhedral, fresh.
5-7% total, homogeneous distribution, except for bottom (Pieces 27A-C)
, which has about 3%; single crystals.
***** GROUNDMASS *****
Medium grained grading to fine grained toward the bottom of unit (Pieces
27A-27C).
***** COLOR *****
Dark gray, but greenish and white in highly altered parts (see below).
***** VESICLES *****
None
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Slightly altered olivine (see above), except for Pieces 15-18 and 25-26
which are strongly to completely altered: patchy pervasive alteration
chlorite + actinolite (needles) + albite(?) + prehnite(?).
***** VEINS/FRACTURES *****
Mainly subhorizontal and vertical to subvertical. < 1%, < 1 mm, filled
by light green mineral (Piece 26). Piece 8, 12, and 25 show hairline
fractures, filled by light gray mineral.
leg : 111 section: 02 unit/subunit : 0188
hole: 0504B top int: 0 cm observer code: KUE
core: 163R pieces : 163R-2, 1,and 164R-1, 10.
rock name: MODERATELY PLAGIOCLASE-OLIVINE-CLINOPYROXENE PHYRIC BASALT.
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Olivine 2-3 1-4 mm euhedral to subhedral. 504B-164R-
1, Piece 3: olivine concentrated
up to 5%, altered to chlorite and
pyrite.
Clinopyroxene 2 up to 9 mm euhedral to subhedral,
clinopyroxene with inclusions of
plagioclase in 163R-2, Piece 3C.
Plagioclase 3 1-4 mm subhedral to euhedral, fresh.
Varying between 7% (163R-3, Piece 19, and 164R-2, Piece 1) and 2%
(164R-2, Piece 10); single crystals and glomerocrysts (164R-1, Pieces
1-2).
***** GROUNDMASS *****
Medium grained, getting finer grained toward bottom of section (164R-1,
Pieces 9 and 10).
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive
***** ALTERATION *****
Slightly altered, olivine completely altered (see above), light color
alteration patches 164R-1, Pieces 9 and 10.
***** VEINS/FRACTURES *****
1. Hairline fractures mainly subhorizontal to horizontal and vertical
to subvertical, filled by light gray mineral. 2. 1 mm fracture, filled
by dark and light green mineral and lined by light gray halo up to 3
mm.
leg : 111 section: 01 unit/subunit : 0188
hole: 0504B top int: 0 cm observer code: KUE
core: 165R pieces : 1-3B
rock name: MODERATELY PLAGIOCLASE-CLINOPYROXENE-OLIVINE PHYRIC BASALT.
contact : None observed.
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1.5 < 3 mm euhedral, single crystals, fresh.
Clinopyroxene < 1 < 4 mm euhedral, single crystals, fresh.
Olivine < 1 0.5-3 mm subhedral-anhedral, single
crystals, replaced by clay + Fe-
oxides (including hematite) and
chlorite.
Total approximately 3%, uniformly distributed.
***** GROUNDMASS *****
Uniformly fine grained.
***** COLOR *****
Dark gray.
***** VESICLES *****
No vesicles.
***** STRUCTURE *****
Massive
***** ALTERATION *****
Slightly altered, olivine replaced by clays/ chlorite/ oxides. Alteration
less than in 504B-164R-1.
***** VEINS/FRACTURES *****
< 1% filled veins, up to 1 mm. < 1% open fracture (Piece 3A and 3B).
Veins have chlorite and zeolite(?).
leg : 111 section: 01 unit/subunit : 0189
hole: 0504B top int: 34 cm observer code: KUE
core: 165R pieces : 4-9
rock name: MODERATELY CLINOPYROXENE-OLIVINE-PLAGIOCLASE PHYRIC BASALT.
contact : None observed.
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase < 1 up to 2 mm euhedral, single crystals, fresh.
Pyroxene 1.5-2 up to 4 mm euhedral, single crystals, fresh.
Olivine 1-1.5 << 1 mm subhedral-anhedral, replaced by
chlorite + clays + oxides +
pyrite.
Total = 3-4%, uniformly distributed.
***** GROUNDMASS *****
Uniformly fine grained (but coarser than Unit 188).
***** COLOR *****
Dark gray.
***** VESICLES *****
No vesicles.
***** STRUCTURE *****
Massive
***** ALTERATION *****
Slightly altered olivines replaced by chlorite/clays/pyrite/Fe-oxide.
***** VEINS/FRACTURES *****
<< 1%, hairline veins filled with chlorite and clays.
leg : 111 section: 01 unit/subunit : 0190
hole: 0504B top int: 0 cm observer code: KUE
core: 166R pieces : 1-2
rock name: APHYRIC BASALT
contact : Possible intruded by chilled margin visible on one side of
Piece 1, Azimuth 180 degrees, Dip 10 degrees (Unit itself
appears to be chilled margin sample).
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Olivine << 1 1 mm anhedral, altered to chlorite and
clays in Piece 1.
<< 1% (essentially aphyric) but possibly one or two olivine
phenocrysts in Piece 1.
***** GROUNDMASS *****
Very fine grained. NB small portion of chill (darker gray) on Piece 1.
***** COLOR *****
Dark gray.
***** VESICLES *****
No vesicles.
***** STRUCTURE *****
Massive.
***** ALTERATION *****
Piece 2 slightly altered. Piece 1 moderately altered with halos = 2 mm wide
around veins. These are light gray green color. Olivine altered to chlorite
with small alteration halos < 1 mm wide. Small alteration halo (2-3 mm)
along part of chill, apparently cut by intrusive chill margin.
***** VEINS/FRACTURES *****
2%. Filled veins in Piece 1 (One cuts chilled margin contact). < 1 mm
width, somewhat irregular. Filled with chlorite and light greenish
soft mineral. The chlorite lines vein margins. Possible zeolite also
in hairline veins in Pieces 1 and 2.
leg : 111 section: 01 unit/subunit : 0191
hole: 0504B top int: 0 cm observer code: KUE
core: 169R pieces : 1,7,11A,11B,12,14, and 21-23
rock name: MODERATELY CLINOPYROXENE-OLIVINE-PLAGIOCLASE PHYRIC BASALT.
contact : None
***** MAIN COMMENTS *****
Vein/fractures: Alteration halos (light greenish gray) up to 2 mm wide in
Pieces 11A and 11B, dark gray (1 mm) halo with lighter outer halo (2 mm) on
Piece 22. Piece 23: Irregular dark vein, 2 mm wide; light greenish gray
irregular halo up to 3 mm wide, also forming patches in the groundmass.
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1 1-5 mm(Piece euhedral prismatic to subhedral,
14) fresh.
Olivine 1-2 0.5-3 mm subhedral, replaced by chlorite
and pyrite.
Clinopyroxene 2 1-7 mm euhedral prismatic to subhedral,
fresh.
3-4%, homogeneous distribution.
***** GROUNDMASS *****
Uniformly fine grained. Piece 7: Patches of coarser-grained groundmass.
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive
***** ALTERATION *****
Slightly altered. Olivine completely altered (see above). Patchy alteration
in Piece 23 (greenish gray), associated with dark vein described below.
***** VEINS/FRACTURES *****
Horizontal to subhorizontal, vertical to subvertical. Piece 1 -
Surface coated by chalcopyrite and pyrite, most pieces contain
hairline fractures, filled by light gray material(?), crosscut by
fractures described below. Pieces 11A, 11B, 12, 21, and 22 - contain
inclined fractures (about 60 degrees), up to 1 mm wide, filled and
lined by chlorite + pyrite (Piece 22) + pale green to gray mineral
(Pieces 11A and 11B). See comments
leg : 111 section: 01 unit/subunit : 0191
hole: 0504B top int: 0 cm observer code: KUE
core: 170R pieces : 1-9
rock name: MODERATELY CLINOPYROXENE-OLIVINE-PLAGIOCLASE PHYRIC BASALT.
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
phenocryst name % size description
Plagioclase 1.5 1-3 mm euhedral-subhedral, tabular,
fresh.
Clinopyroxene 2 1-6 mm euhedral-subhedral, prismatic,
partly altered to actinolite(?).
Olivine 1 0.5-2 mm subhedral, replaced by chlorite
and pyrite(?).
3-5%, homogeneous distribution.
***** GROUNDMASS *****
Generally fine grained, although somewhat patchy in Piece 5.
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive, some minor hairline fractures, e.g., Piece 15.
***** ALTERATION *****
In general, slightly altered; pyroxene and olivine altered as above. Very
faint halos, about 2 mm; lighter gray around some veins, e.g. Piece 4.
***** VEINS/FRACTURES *****
Minor veins, approximately 2/3 of them filled by light gray material,
hairline which crosscut (e.g. Piece 4) chlorite-filled veins that are
slightly thicker. Vein in Piece 3 is partially open fracture.
leg : 111 section: 01 unit/subunit : 0192
hole: 0504B top int: 45 cm observer code: KUE
core: 170R pieces : 10-11
rock name: APHYRIC BASALT
contact : None
***** MAIN COMMENTS *****
***** PHENOCRYSTS *****
Aphyric.
***** GROUNDMASS *****
Very fine grained.
***** COLOR *****
Dark gray.
***** VESICLES *****
None
***** STRUCTURE *****
Massive.
***** ALTERATION *****
In general, slightly altered.
***** VEINS/FRACTURES *****
As with Unit 191, one light gray vein in Piece 10. Considerable (2%)
chlorite veining in Piece 11; irregular veins up to 1 mm thick.
introduction | data types | geographic areas | legs/sites/holes | sites/holes
These Web pages are from the Core Data from the Ocean Drilling Program Legs 101-129 CD-ROM produced in 2001 by the U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite, Data, and Information Service, National Geophysical Data Center, and collocated World Data Center for Marine Geology and Geophysics, Boulder. Data were compiled in cooperation with the U.S. Science Support Program, the Joint Oceanographic Institutions, Inc., and the U.S. National Science Foundation. Please see the NGDC privacy, disclaimer, and copyright notices. Additional ocean drilling data are available from NGDC and from the ODP/IODP.
questions to: carla.j.moore@noaa.gov