leg site hole core coretype section top interval unit number sub unit pieces observer rockname contact phenocrysts mineral name (1) phenocrysts percent (1) phenocrysts size (1) phenocrysts description (1) phenocrysts mineral name (2) phenocrysts percent (2) phenocrysts size (2) phenocrysts description (2) phenocrysts mineral name (3) phenocrysts percent (3) phenocrysts size (3) phenocrysts description (3) phenocrysts mineral name (4) phenocrysts percent (4) phenocrysts size (4) phenocrysts description (4) phenocrysts mineral name (5) phenocrysts percent (5) phenocrysts size (5) phenocrysts description (5) phenocrysts comments groundmass color vesicles percent vesicles size vesicles shape vesicles distribution vesicles miaroles vesicles comments structure alteration veins frractures size veins fractures orientation veins fractures percent veins fractures comments main comments more data latitude numerical form longitude numerical form depth top interval depth below sea floor 111 504 B 142 Rotary 01 000 0151 1-3 KUE MODERATELY PLAGIOCLASE-OLIVINE-CLINOPYROXENE PHYIRC BASALT. Azimuth 045. Dip 85 degrees. Intruded by chill of lithologic Unit 152; Unit 151 not chilled. 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. Uniformly fine grained. Light gray Non vesicular. Massive Relatively fresh (slightly altered), minor chloritization and minor (< 1%) pyrite in 0.5 mm patches. 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. N 1.22685 -83.73030 1352.80 135280 111 504 B 142 Rotary 01 000 0152 1-3 KUE HIGHLY OLIVINE-CLINOPYROXENE-PLAGIOCLASE PHYRIC BASALT Azimuth 045, runs through Pieces 1A-3. Dip 85 degrees. Intrusive chilled against lithologic Unit 151 (hatched), extreme marginal 2 mm possibly glassy. 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. Uniformly very fine grained, extreme chill virtually glassy. Dark gray to black. Nonvesicular. Fairly massive. Fresh, 5-10%(?) chloritized, slightly altered. Low angle, short 2-3 cm, 1 mm fractures with chlorite/hematite filling. No halos. N 1.22685 -83.73030 1352.80 135280 111 504 B 142 Rotary 01 025 0153 4-19 KUE SPARSELY TO HIGHLY OLIVINE-CLINOPYROXENE-PLAGIOCLASE PHYRIC BASALT. Not seen. however, phenocryst content and proportion suggest unit may be continuation of Unit 152. See contact relations decribed in Unit 152. 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. Very fine grained. Light greenish gray Nonvesicular. See comments 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. 15% filled veins. Virtually zero open fractures. Veins from 0.1-2 mm wide, filled with chlorite and traces of sulfides. 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. N 1.22685 -83.73030 1352.80 135305 111 504 B 142 Rotary 02 000 0153 1-8 KUE MODERATELY CLINOPYROXENE-OLIVINE-PLAGIOCLASE PHYRIC BASALT. 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. 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. 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. Medium to dark gray. Light gray alteration patches throughout the unit. Nonvesicular. Massive(see grain size variation). 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). 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). N 1.22685 -83.73030 1354.30 135430 111 504 B 143 Rotary 01 000 0154 1-7 KUE MODERATELY PLAGIOCLASE-OLIVINE-CLINOPYROXENE PHYRIC BASALT. None 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. Uniformly fine grained. Dark gray. Nonvesicular. Massive. 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. < 1%, < 0.5 mm, filled with chlorite. N 1.22685 -83.73030 1359.30 135930 111 504 B 143 Rotary 01 040 0155 piece 8, to the end of core KUE MODERATELY TO HIGHLY OLIVINE-PLAGIOCLASE PHYRIC BASALT. None 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. Generally fine grained with patches of coarser grained material in Pieces 17-21 with interstitial chlorite (+ talc?). Dark gray. Nonvesicular. Massive. 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?). 1%, < 0.5 mm, filled with chlorite (50%) and unidentified white mineral (50%) + traces of pyrite; no apparent relationship. N 1.22685 -83.73030 1359.30 135970 111 504 B 144 Rotary 01 000 0156 1 KUE MODERATELY OLIVINE-PLAGIOCLASE-CLINOPYROXENE PHYRIC BASALT. None 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. Fine grained, plagioclase crystals in mm-sized aggregates throughout. Dark gray. Nonvesicular. Massive. Slightly altered, olivine replaced by chlorite, minor disseminated pyrite. < 0.5%, 0.5 mm, filled with chlorite. Trace anhydrite (?) on fracture surface of Piece 1. No halos. N 1.22685 -83.73030 1368.70 136869 111 504 B 144 Rotary 01 008 0157 2-9 KUE MODERATELY PLAGIOCLASE-OLIVINE-CLINOPYROXENE PHYRIC BASALT, None 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. Fine grained, finer toward the base in Piece 9. Dark gray. Nonvesicular. Massive. Generally slightly altered, olivine totally replaced by chlorite and minor pyrite (up to 1 mm). 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. N 1.22685 -83.73030 1368.70 136877 111 504 B 144 Rotary 01 061 0158 10-13 KUE MODERATELY TO HIGHLY PLAGIOCLASE-OLIVINE-CLINOPYROXENE PHYRIC BASALT. None 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. Very fine grained (possibly slightly coarser toward bottom, Piece 13). Dark gray. Nonvesicular. Massive. Generally slightly altered, olivine totally replaced by chlorite and pyrite (< 1 mm); pyrite on fracture surface of Piece 13. 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. N 1.22685 -83.73030 1368.70 136930 111 504 B 144 Rotary 01 095 0159 14-16 KUE APHYRIC BASALT None none Uniformly very fine grained. Dark gray. Nonvesicular Massive. Slightly altered. 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?). N 1.22685 -83.73030 1368.70 136964 111 504 B 145 Rotary 01 000 0160 1-15 KUE MODERATELY CLINOPYROXENE-PLAGIOCLASE-OLIVINE PHYRIC BASALT. None 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. Uniformly medium grained. Dark gray. None Massive. Slightly altered. Light green alteration halos, Pieces 1, 14A, and 14B up to 4 cm wide; olivine altered as described above. 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(?) N 1.22685 -83.73030 1378.30 137830 111 504 B 145 Rotary 02 000 0160 1-12 KUE MODERATELY CLINOPYROXENE-PLAGIOCLASE-OLIVINE PHYRIC BASALT. n/a 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. n/a n/a n/a n/a Pieces 7D and 7H: Irregular patches of lighter gray alteration. n/a N 1.22685 -83.73030 1379.80 137980 111 504 B 145 Rotary 03 000 0160 1-13 KUE MODERATELY CLINOPYROXENE-PLAGIOCLASE-OLIVINE PHYRIC BASALT n/a Clinopyroxene - up to 14 mm, partly broken crystals, orientation parallel to core axis. n/a n/a n/a n/a 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. n/a N 1.22685 -83.73030 1381.30 138130 111 504 B 146 Rotary 01 000 0162 1-4 KUE MODERATELY PLAGIOCLASE-OLIVINE-PYROXENE PHYRIC BASALT. None 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. Medium to fine grained, uniform throughout. Dark gray. None Massive, texture is seriate porphyritic. Generally slightly altered. Olivines completely altered to chlorite and pyrite. On outer surface of Piece 1: probably anhydrite. "Insignificant" hairline fractures in Pieces 1 and 4: fil ed with dark mineral (chlorite?). N 1.22685 -83.73030 1388.00 138800 111 504 B 147 Rotary 01 000 0163 1-13 KUE MODERATELY PLAGIOCLASE-OLIVINE-PYROXENE PHYRIC BASALT. None 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. Generally uniform medium grained; some slightly coarser grained patches of plagioclase microlite concentration (+ olivine) and less mesostasis, in Pieces 6A, 6C, and 13. Dark gray. None Massive. Slightly altered. Olivine completely altered to chlorite + pyrite + possible talc. Scarce veins (< 1 mm thick) filled with undetermined soft white minerals, in Pieces 6C and 8E. Fractures mostly horizontal to subhorizontal and vertical. N 1.22685 -83.73030 1397.40 139740 111 504 B 147 Rotary 02 000 0163 1A-10 KUE MODERATELY PLAGIOCLASE-OLIVINE-PYROXENE PHYRIC BASALT. None 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. Similar to Section 147R-1. Dark gray. None Massive. Generally slightly altered or completely altered to chlorite + pyrite + possible talc. More abundant than in Section 147R-1, mostly horizontal to sub horizontal and vertical. Filled by same white mineral as 504B-147R-1. N 1.22685 -83.73030 1398.54 139854 111 504 B 148 Rotary 01 000 0164 1-20 KUE MODERATELY PLAGIOCLASE-CLINOPYROXENE-OLIVINE PHYRIC BASALT None 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. Generally uniformly fine grained, coarser patches in 504B-148R-1, Pieces 1 and 4, 1-5 mm patches of concentrated plagioclase throughout. Dark gray. Irregular mm-sized vugs in 504B-148R-1, Pieces 1 and 4, filled with chlorite. Massive. 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. < 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. 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. N 1.22685 -83.73030 1406.80 140680 111 504 B 149 Rotary 01 020 0164 148R-1, Piece 4, to 149R-2, 7 KUE SPARSELY PLAGIOCLASE-CLINOPYROXENE-OLIVINE PHYRIC BASALT. None 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. Unifromly fine grained, becoming very fine grained in 504B-149R-2, Pieces 6 and 7. Dark gray. Absent Massive. Generally slightly altered; olivine altered to chlorite and pyrite. Alteration halos in 504B-149R-2, Piece 6 and 7 (see below). < 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 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. N 1.22685 -83.73030 1416.90 141710 111 504 B 150 Rotary 01 000 0165 1-11 KUE SPARSELY CLINOPYROXENE-OLIVINE-PLAGIOCLASE PHYRIC BASALT None Plagioclase < 1 1-2 mm subhedral, fresh. Clinopyroxene 1 1-5 mm in Piece 11. euhedral prismatic to subhedral, 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. Uniformly medium grained. Dark gray. None Massive. Slightly altered. Olivine altered to chlorite + talc +pyrite (from center to rim and also reverse relationship and mixed). Piece 7A: subperpendicular pattern of fractures (< 1 mm), filled with white alteration mineral. N 1.22685 -83.73030 1426.40 142640 111 504 B 150 Rotary 01 054 0166 12-13 KUE APHYRIC BASALT None 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. Very fine grained. Dark gray. None Massive. Slightly altered. See olivine above. Light green alteration halos around chlorite-filled vugs in Piece 13. None None N 1.22685 -83.73030 1426.40 142694 111 504 B 150 Rotary 01 060 0167 14-23 KUE APHYRIC TO SPARSELY (PIECE 19) OLIVINE-CLINOPYROXENE (-PLAGIOCLASE) PHYRIC BASALT. None 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. Medium grained. Dark gray. None Massive. Slightly altered, olivine completely altered. Piece 14: fibrous white alteration mineral (anhydrite?) on outer surface, coated with green material. 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. N 1.22685 -83.73030 1426.40 142700 111 504 B 151 Rotary 01 000 0168 1-8 KUE SPARSELY CLINOPYROXENE-OLIVINE PHYRIC BASALT None observed 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. Uniformly fine grained with mm-sized patches of feldspar (more clearly in Piece 8). Uniformly dark gray. None Massive. Slightly altered; olivine totally replaced by chlorite/pyrite. 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. N 1.22685 -83.73030 1430.80 143080 111 504 B 152 Rotary 01 000 0169 1-2 KUE SPARSELY PLAGIOCLASE-OLIVINE PHYRIC BASALT chilled against Unit 170. Dip = 70 degrees. Azimuth = 45 degrees. 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). Very fine grained throughout. Dark gray grading to light gray within 5 mm of contact. None Massive. 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. < 1% of unit, = 0.2 mm wide, filled with chlorite (90%) plus white mineral (10%). No relationship observed. N 1.22685 -83.73030 1435.90 143590 111 504 B 152 Rotary 01 005 0170 2-3 KUE MODERATELY PLAGIOCLASE-OLIVINE PHYRIC BASALT Unit 169 chilled against Unit 170. Therefore, relationships as above. 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. Fine to medium grained, patchy grain size. Variation picked out by alteration. Dark greenish gray. None Massive. 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. 1% vertical chlorite veins in Piece 2, 0.5-1 mm wide. 1% white prismatic mineral (laumontite) on fracture surfaces. N 1.22685 -83.73030 1435.90 143595 111 504 B 152 Rotary 01 025 0171 4-6 KUE MODERATELY PLAGIOCLASE-CLINOPYROXENE-OLIVINE PHYRIC BASALT. None visible, but Piece 6 grades to very fine grained, probably chilled zone. 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. Very fine grained throughout, finer at edge of Piece 6. Uniformly dark gray, except for chilled zone of Piece 6. None Massive. Slightly altered throughout, olivine replaced by chlorite. 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. N 1.22685 -83.73030 1435.90 143615 111 504 B 152 Rotary 01 040 0172 7-9 KUE MODERATELY OLIVINE-PLAGIOCLASE-CLINOPYROXENE PHYRIC BASALT. Top not observed, breccia chilled against Unit 172, Piece 10. 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. Generally uniformly fine grained; Piece 10 very fine grained to glassy. Dark gray. None Massive, Piece 10 contains contact breccia, with fragments of Unit 172 included within chilled material. Slightly altered throughout; olivine replaced by chlorite and pyrite. < 1%, vertical hairline fractures and veinlets filled with chlorite in Piece 7. 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. N 1.22685 -83.73030 1435.90 143630 111 504 B 152 Rotary 01 060 0173 10-13 KUE MODERATELY OLIVINE-PLAGIOCLASE-CLINOPYROXENE PHYRIC BASALT. Exposed in Piece 12, intruded by Unit 174. Contact quite irregular, general azimuth 090, dip ~ vertical. Unit 173 is not chilled. 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. Fine grained, uniform. Dark gray. None Fairly massive - incipient brecciation. Strongly altered. Considerable groundmass chlorite and pyrite. Olivines completely altered. Minor amounts of laumontite ( + prehnite? ) in microfractures and small vugs (?) 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. N 1.22685 -83.73030 1435.90 143650 111 504 B 152 Rotary 01 074 0174 12 & 16(out-of-place fragment) KUE MODERATELY PLAGIOCLASE-CLINOPYROXENE-OLIVINE PHYRIC BASALT Intrusive contact; irregular and chilled versus Unit 173. Average azimuth 90 degrees and dip = vertical. 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. Very fine grained, chilled contact. Medium gray, altered to light gray to greenish within 5-10 mm of contact. None 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. Slightly altered, olivine replaced by chlorite, light gray coloration within 5-10 mm of contact. < 1%, 0.2-0.5 mm, horizontal veinlets with unidentified white mineral. N 1.22685 -83.73030 1435.90 143664 111 504 B 152 Rotary 01 090 0175 14-15 and 17-20 KUE MODERATELY CLINOPYROXENE-OLIVINE-PLAGIOCLASE PHYRIC BASALT Not observed. 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. Fine grained in Pieces 14-15 and 17-18, grading to very fine grained in Pieces 19-20. Dark gray. None Massive. Slightly altered. Olivine replaced by chlorite. Piece 20: subhorizontal veins, < 0.5 mm, ~ 0.5% of Piece 20, filled with unidentified white mineral. N 1.22685 -83.73030 1435.90 143680 111 504 B 153 Rotary 01 000 0176 153R-1, 1-22, and 153R-2, 1-15 KUE SPARSELY OLIVINE-CLINOPYROXENE-PLAGIOCLASE PHYRIC BASALT None 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. Throughout uniformly fine grained, becoming slightly finer grained toward bottom of core (153R-2, Pieces 13-15). Dark gray. Absent Massive 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. 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. N 1.22685 -83.73030 1445.30 144530 111 504 B 154 Rotary 01 000 0176 1-12 KUE MODERATELY CLINOPYROXENE-OLIVINE-PLAGIOCLASE PHYRIC BASALT. None 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). Fine grained, becoming slightly finer grained toward bottom of section. Dark gray Absent Massive Slightly altered, patches of lighter green gray alteration, center shows advanced chloritization (e.g., Pieces 4C and 7). 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. Pieces 8-12 show strong Fe-hydroxide staining (due to drilling?). N 1.22685 -83.73030 1454.30 145430 111 504 B 155 Rotary 01 000 0176 1-14 KUE MODERATELY CLINOPYROXENE-OLIVINE-PLAGIOCLASE PHYRIC BASALT. None observed. 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. Uniformly fine grained. Dark gray. Irregular mm-sized vugs filled with chlorite in Pieces 2 and 8. Massive. Slightly altered. Olivine replaced by chlorite and pyrite; cm-sized light gray alteration halos around chlorite-filled vugs in Pieces 2 and 8. 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. N 1.22685 -83.73030 1459.00 145900 111 504 B 156 Rotary 01 000 0177 1-8 and 10-12 KUE APHYRIC TO SPARSELY PLAGIOCLASE-OLIVINE PHYRIC BASALT. Not observed. 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. Grading from very fine grained in Piece 1 to fine grained in Piece 12. Gray to greenish gray. None Massive. Close to chilled margin at top of section, small amount of another unit chilled against Unit 177 in Pieces 1 and 2. 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. 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. N 1.22685 -83.73030 1463.80 146380 111 504 B 156 Rotary 01 041 0178 9 and 13 KUE SPARSELY PLAGIOCLASE-CLINOPYROXENE-OLIVINE PHYRIC BASALT. Not observed. 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. Fine grained. Dark gray. None Massive. 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. 1%, < 0.5 mm, filled with chlorite, all in Piece 13 (unoriented). N 1.22685 -83.73030 1463.80 146421 111 504 B 156 Rotary 01 068 0179 156R-1,14, to 157R-1,1 KUE MODERATELY PYROXENE-OLIVINE PLAGIOCLASE PHYRIC BASALT. None visible. 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. Uniformly fine grained. Dark greenish gray. No vesicles. Massive. Slightly altered. Olivine completely altered to chlorite plus Fe-oxide (hm). Thin (= 1 mm) light gray alteration halos around altered olivine. None visible. N 1.22685 -83.73030 1463.80 146448 111 504 B 157 Rotary 01 000 0179 1 KUE SPARSELY OLIVINE-PLAGIOCLASE-CLINOPYROXENE PHYRIC BASALT. None (possible, see below). 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. Very fine grained. Dark gray. Absent. Massive. Slightly to moderately (in veins) altered; olivine totally altered (see above). 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. N 1.22685 -83.73030 1473.10 147309 111 504 B 157 Rotary 01 006 0180 2 and 3 KUE APHYRIC BASALT. None 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. Fine grained. Dark gray. Absent. Massive. Slightly altered. Olivine totally altered (see above). Laumontite + sulfide on fracture surfaces. Alteration halo approximately 5 mm, light greenish gray on Piece 2. Piece 2: << 1%, hairline fractures, filled by light greenish gray irregular mixture of chlorite + mixed-layer clays + prehnite (?). N 1.22685 -83.73030 1473.10 147315 111 504 B 157 Rotary 01 020 0181 4-15 KUE APHYRIC TO SPARSELY CLINOPYROXENE-OLIVINE-PLAGIOCLASE PHYRIC BASALT. None 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. 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. Dark gray. Absent. Massive. Slight to moderate in Pieces 5, 13, and 14; olivine totally altered (see above). laumontite on outer surfaces of Pieces 5 and 6. 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 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). N 1.22685 -83.73030 1473.10 147329 111 504 B 158 Rotary 01 000 0182 1-7, Piece 2 not in order. KUE APHYRIC BASALT None 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. Uniformly very fine grained, except Piece 2, which is fine grained. Dark gray. None Massive. Piece 4: slightly to moderately altered. Piece 2: disseminated pyrite, < 0.3 mm, << 1%, no fractures present here. 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 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. N 1.22685 -83.73030 1482.50 148250 111 504 B 159 Rotary 01 000 0183 1-8 KUE MODERATELY PLAGIOCLASE-OLIVINE-CLINOPYROXENE PHYRIC BASALT. In Piece 8, Unit 184 is "chilled" against 183; see Unit 184 for details. 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. Uniformly fine to medium fine grained. Dark gray. None massive. Slightly altered. Olivine completely altered (see above). Fine diseminated pyrite (< 0.25 mm diameter). Rare, < 0.5 mm hairline, filled by gray-white mineral (e.g. Piece 2). Note: Piece 4- Phenocrysts: Aphyric. Groundmass: Fine grained. Color: Dark gray. Alteration: Slightly altered. Vein/fractures: Absent. N 1.22685 -83.73030 1488.10 148809 111 504 B 159 Rotary 01 043 0184 8-10 KUE APHYRIC BASALT. 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. Aphyric. Uniformly fine to very fine grained. Dark gray. None. Massive. Slightly altered. Piece 9 has dark gray patches rimmed by lighter gray alteration halos ~ 3-4 mm wide. < 1 mm, << 1%, greenish gray mineral and very rare white mineral and sulfides fill veins. Very closely spaced fractures in Pieces 9 and 10. N 1.22685 -83.73030 1488.10 148852 111 504 B 160 Rotary 01 000 0185 1-2 and 4-6. KUE APHYRIC BASALT. None observed. Clinopyroxene < 1 1-3 mm subhedral, fresh. Essentially aphyric; < 1% total. Phenocrysts evenly distributed. Fine grained (uniform). Dark gray. None Massive. Small chilled dykelet cutting 185 in Piece 6, ~ 5 mm wide. Light gray alteration halos = 3 mm wide around veins and around dykelet in Piece 6. 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. N 1.22685 -83.73030 1494.70 149469 111 504 B 160 Rotary 01 037 0186 7-10 KUE APHYRIC BASALT. None observed. Plagioclase < 1 0.5-3 mm euhedral, partially altered to ? in centers. Less than 1% overall, evenly distributed. Very fine grained (more than Unit 185). Dark gray. None. Massive. 2 mm light gray alteration halos around veins in Pieces 9 and 10. Sparse pyrite in Piece 3. < 1%, 0.5-mm-wide chlorite-filled veins in Pieces 9 and 10. Plagioclase phenocrysts partly altered to chlorite(?) in cores. N 1.22685 -83.73030 1494.70 149506 111 504 B 161 Rotary 01 000 0187 1-11 KUE MODERATELY PLAGIOCLASE-CLINOPYROXENE-OLIVINE PHYRIC BASALT. None 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. Uniformly medium grained but patches of coarser material in Piece 1. Dark gray. None Massive. Slightly altered. Olivine 100% altered (see above). < 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. N 1.22685 -83.73030 1504.10 150409 111 504 B 162 Miscellaneous 01 000 0187 1 KUE APHYRIC BASALT, MOST LIKELY FROM BELOW 900 MBSF. None None, Aphyric. Fine grained. Greenish gray. None Massive. Uniformly slightly altered to greenish gray color. None N 1.22685 -83.73030 1511.50 151150 111 504 B 162 Miscellaneous 01 011 0187 2, 3, 5, 6, and 7 KUE MODERATELY TO HIGHLY OLIVINE-PLAGIOCLASE +/- CLINOPYROXENE PHYRIC BASALT. None. 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. Fresh, fine grained. Gray. <5 0.5-2 mm Rounded Found mostly in Piece 7 Filled with smectite and calcite. Massive. 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. None observed. N 1.22685 -83.73030 1511.50 151161 111 504 B 162 Miscellaneous 01 035 0187 4, 8, and 9 KUE MODERATELY PLAGIOCLASE-OLIVINE + CLINOPYROXENE PHYRIC BASALT. None 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. Fine grained. Dark gray. None Massive. Slightly altered. Olivine replaced by clays and pyrite. < 1%, hairline crack filled with white stuff in Piece 4B, hairline crack filled with clay and pyrite in Piece 9A. N 1.22685 -83.73030 1511.50 151185 111 504 B 163 Rotary 01 000 0187 1-27c KUE MODERATELY PLAGIOCLASE-OLIVINE-CLINOPYROXENE PHYRIC BASALT. None 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. Medium grained grading to fine grained toward the bottom of unit (Pieces 27A-27C). Dark gray, but greenish and white in highly altered parts (see below). None Massive. 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(?). 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. N 1.22685 -83.73030 1511.60 151159 111 504 B 163 Rotary 02 000 0188 163R-2, 1,and 164R-1, 10. KUE MODERATELY PLAGIOCLASE-OLIVINE-CLINOPYROXENE PHYRIC BASALT. None 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). Medium grained, getting finer grained toward bottom of section (164R-1, Pieces 9 and 10). Dark gray. None Massive Slightly altered, olivine completely altered (see above), light color alteration patches 164R-1, Pieces 9 and 10. 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. N 1.22685 -83.73030 1513.10 151309 111 504 B 165 Rotary 01 000 0188 1-3B KUE MODERATELY PLAGIOCLASE-CLINOPYROXENE-OLIVINE PHYRIC BASALT. None observed. 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. Uniformly fine grained. Dark gray. No vesicles. Massive Slightly altered, olivine replaced by clays/ chlorite/ oxides. Alteration less than in 504B-164R-1. < 1% filled veins, up to 1 mm. < 1% open fracture (Piece 3A and 3B). Veins have chlorite and zeolite(?). N 1.22685 -83.73030 1529.50 152950 111 504 B 165 Rotary 01 034 0189 4-9 KUE MODERATELY CLINOPYROXENE-OLIVINE-PLAGIOCLASE PHYRIC BASALT. None observed. 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. Uniformly fine grained (but coarser than Unit 188). Dark gray. No vesicles. Massive Slightly altered olivines replaced by chlorite/clays/pyrite/Fe-oxide. << 1%, hairline veins filled with chlorite and clays. N 1.22685 -83.73030 1529.50 152984 111 504 B 166 Rotary 01 000 0190 1-2 KUE APHYRIC BASALT 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). 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. Very fine grained. NB small portion of chill (darker gray) on Piece 1. Dark gray. No vesicles. Massive. 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. 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. N 1.22685 -83.73030 1543.50 154350 111 504 B 169 Rotary 01 000 0191 1,7,11A,11B,12,14, and 21-23 KUE MODERATELY CLINOPYROXENE-OLIVINE-PLAGIOCLASE PHYRIC BASALT. None Plagioclase 1 1-5 mm(Piece 14) euhedral prismatic to subhedral, 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. Uniformly fine grained. Piece 7: Patches of coarser-grained groundmass. Dark gray. None Massive Slightly altered. Olivine completely altered (see above). Patchy alteration in Piece 23 (greenish gray), associated with dark vein described below. 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 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. N 1.22685 -83.73030 1547.60 154759 111 504 B 170 Rotary 01 000 0191 1-9 KUE MODERATELY CLINOPYROXENE-OLIVINE-PLAGIOCLASE PHYRIC BASALT. None 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. Generally fine grained, although somewhat patchy in Piece 5. Dark gray. None Massive, some minor hairline fractures, e.g., Piece 15. 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. 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. N 1.22685 -83.73030 1553.60 155359 111 504 B 170 Rotary 01 045 0192 10-11 KUE APHYRIC BASALT None Aphyric. Very fine grained. Dark gray. None Massive. In general, slightly altered. 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. N 1.22685 -83.73030 1553.60 155404