Interval (cm) Depth Plagioclase average Phenocryst Olivine average Phenocryst Clinopyroxene average Phenocryst Oxide minerals Comments - crystallinity (holo/hypo/hyalo) Additional Alteration Comments mbsf mbsf Min Max gs-ph gs-gm Habit 3D shape Min Max gs-ph gs-gm Habit 3D shape Min Max gs-ph gs-gm Habit 3D shape size Dist. Shape Color Groundmass Vesicle Glass Alter. "texture (seriate, poikilitic, ophitic, subophitic," Hole Core Sec Pc Top Bot Lgth core piece Unit Lithology Contact (%) (%) (mm) (mm) (%) (%) (mm) (mm) (%) (%) (mm) (mm) (%) (mm) (%) (%) (%) "intergranular, intersertal, phyric, etc.)" 957B 004R 1 1 0 16 16 19.9 19.9 1 Sparsely Phyric Olivine Pillow Rim Breccia No contact observed 0 0.7 1 3 0.5 Euhedral Brown Gray Glassy to Microcrystalline 2 30 100 Interpillow/breccia fragments in mud (metalliferous sediments?); basalt altered to smectite; glass altered to chlorite. 957B 004R 1 2 16 25 9 19.9 20.06 1 Sparsely Phyric Olivine Pillow Rim Breccia 0 0.7 1 3 0.5 Euhedral Brown Gray Glassy to Microcrystalline 2 30 100 Interpillow/breccia fragments in mud (metalliferous sediments?); basalt altered to smectite; glass altered to chlorite. 957B 004R 1 3 25 39 14 19.9 20.15 1 Sparsely Phyric Olivine Pillow Rim Breccia 0 0.7 1 3 0.5 Euhedral Brown Gray Glassy to Microcrystalline 2 30 100 Interpillow/breccia fragments in mud (metalliferous sediments?); basalt altered to smectite; glass altered to chlorite. 957B 004R 1 4 39 43 4 19.9 20.29 1 Sparsely Phyric Olivine Pillow Rim Breccia 0 0.7 1 3 0.5 Euhedral Brown Gray Glassy to Microcrystalline 2 30 100 Interpillow/breccia fragments in mud (metalliferous sediments?); basalt altered to smectite; glass altered to chlorite. 957B 004R 1 5 43 47 4 19.9 20.33 1 Sparsely Phyric Olivine Pillow Rim Breccia No contact observed 0 0.7 Brown Gray Glassy 5 100 100 Glass cemented by hydrothermal silica; disseminated sulfide grains present. 957B 004R 1 6 47 50 3 19.9 20.37 2 Aphyric Basalt 0 0.7 0 1 0.5 Euhedral Red Brown Microcrystalline 2 0 15 Vesicles filled with smectite. 957B 004R 1 7 50 55 5 19.9 20.4 2 Aphyric Basalt 0 0.7 0 1 0.5 Euhedral Dark Gray Microcrystalline 2 0 7 Vesicles filled with smectite. 957B 004R 1 8 55 60 5 19.9 20.45 2 Aphyric Basalt 0 0.7 0 1 0.5 Euhedral Dark Gray Microcrystalline 2 0 7 Vesicles filled with smectite. 957B 005B 1 1 0 3 3 29.6 29.6 2 Aphyric Basalt 0 0.5 Red Gray Microcrystalline 0 0 100 Basalt altered to chlorite. 957B 005B 1 2 3 9 6 29.6 29.63 2 Aphyric Basalt No contact observed 0 0.5 Red Gray Microcrystalline 2 0 100 Vesicles filled with smectite. 957M 009R 1 3 12 17 5 42.3 42.3 Silicified Basalt Clasts No contact observed Light Gray 100 Silicified variolitic rim; pyrite on outside of clasts and lining vug. 957M 009R 1 4 17 24 7 42.3 42.35 Silicified Basalt Clasts Light Gray 100 Silicified (chloritized?) basalt clasts; pyrite coating on clasts and lining vugs. 957M 009R 1 5 24 30.5 6.5 42.3 42.42 1 Sparsely Phyric Olivine Basalt No contact observed 0.5 1 2 <1 Euhderal Dark Gray with Blue Green Rim Microcrystalline 1 0 50 Plagioclase microlites appear fresh; olivine replaced by chlorite and Fe oxyhydroxides. Rim alteration (1 cm wide) of concentric halos of light to dark green/gray with disseminated pyrite; microfracture filled with chlorite and white clay mineral. 957M 009R 1 6 30.5 37 6.5 42.3 42.49 1 Sparsely Phyric Olivine Basalt 0.5 1 2 <1 Euhderal Dark Gray with Blue Green Rim Microcrystalline 1 0 50 "Olivine replaced by Fe oxyhydroxides, pyrite, and white mineral; vesicles filled with smectite and chlorite." "Thin veins filled with chlorite, pyrite, or Fe oxyhydroxides; concentric alteration halo (1 cm wide) of outer green and gray zones with disseminated pyrite to red inner zone." 957M 009R 1 7 37 45 8 42.3 42.55 1 Sparsely Phyric Olivine Basalt 0.5 1 <2 <1 Euhderal Dark Gray Microcrystalline 1 0 50 Olivine replaced by chlorite and surrounded by disseminated pyrite; vesicles filled by chlorite and white clay mineral. No alteration halo present. 957M 009R 1 8 45 52 7 42.3 42.63 1 Sparsely Phyric Olivine Basalt 0.5 1 2 <1 Euhderal Dark Gray Microcrystalline 1 10 50 Partial variolitic dark gray rim (.5-3 mm diameter) in a light gray alteration matrix; olivine replaced by chlorite. No alteration halo present; vesicles and vein (borders variolitic rim) filled with chlorite and yellow green mineral; the vein is 1 cm from edge. 957M 009R 1 9 52 58 6 42.3 42.7 1 Sparsely Phyric Olivine Basalt 0.5 1 2 <1 Euhderal Dark Gray Microcrystalline 1 0 50 Olivine replaced by and vesicles filled with chlorite; one vesicle filled with pyrite (.5 mm diameter). No alteration halo present. 957M 009R 1 10 58 66 8 42.3 42.76 1 Sparsely Phyric Olivine Basalt 0.5 1 2 <1 Euhderal Dark Gray Microcrystalline 1 0 50 Olivine replaced by Fe oxyhydroxides. Outer light gray halo (5 mm wide) and inner dark gray halo (5 mm wide) are present. 957M 009R 1 11 66 72 6 42.3 42.84 1 Sparsely Phyric Olivine Basalt 0.5 1 2 <1 Euhderal Dark Gray Microcrystalline 1 0 50 Vesicles filled with chlorite. Outer light gray halo and inner dark gray halo (5 mm wide) are present. 957M 009R 1 12 72 79 7 42.3 42.9 1 Sparsely Phyric Olivine Basalt 0.5 1 2 <1 Euhderal Dark Gray Microcrystalline 1 0 50 Olivine replaced by Fe oxyhydroxides; vesicles filled with light green mineral. "No outer halo; 1 mm thick vein with 1.5 mm thick chlorite halo; vein has pyrite, chlorite, and white clay mineral present." 957M 009R 1 13 79 84 5 42.3 42.97 1 Sparsely Phyric Olivine Basalt 0.5 1 2 <1 Euhderal Dark Gray Microcrystalline <1 0 50 Olivine replaced by and vesicles filled with light green clay mineral. No halo present. 957M 009R 1 14 84 90 6 42.3 43.02 1 Sparsely Phyric Olivine Basalt 0.5 1 2 <1 Euhderal Dark Gray Microcrystalline 1 0 50 Olivine replaced by and vesicles filled with light green clay mineral. No halo present. 957M 009R 1 15 90 94.5 4.5 42.3 43.08 1 Sparsely Phyric Olivine Basalt 0.5 1 2 <1 Euhderal Dark Gray Microcrystalline 1 0 50 Olivine replaced by and vesicles filled with light green clay mineral. No halo present. 957M 009R 1 16 94.5 100 5.5 42.3 43.13 1 Sparsely Phyric Olivine Basalt 0.5 1 2 <1 Euhderal Dark Gray with Blue Green Rim Microcrystalline 2 0 50 Olivine replaced by Fe oxyhydroxides; vesicles filled with light green mineral. "Outer light gray halo, dark gray halo, and inner red brown halo are present and ~5 mm wide; disseminated pyrite in the outer light gray zone." 957M 009R 1 17 100 104 4 42.3 43.18 1 Sparsely Phyric Olivine Basalt 0.5 1 2 <1 Euhderal Dark Gray Microcrystalline 1 0 50 Olivine replaced by and vesicles filled with light green clay mineral. No halo present. 957M 009R 1 18 104 110 6 42.3 43.22 1 Sparsely Phyric Olivine Basalt 0.5 1 2 <1 Euhderal Dark Gray Microcrystalline 1 0 50 Olivine replaced by and vesicles filled with light green clay mineral. Dark green gray outer halo of chlorite and disseminated pyrite. 957M 009R 1 19 110 117 7 42.3 43.28 1 Sparsely Phyric Olivine Basalt 0.5 1 2 <1 Euhderal Dark Gray Microcrystalline 1 0 50 Olivine replaced by and vesicles filled with light green clay mineral. "Outer Fe oxyhydroxide halo (<1 mm wide), green gray halo (1-2 mm wide), and inner red brown halo are present." 957M 009R 1 20 117 122 5 42.3 43.35 1 Sparsely Phyric Olivine Basalt 0.5 1 2 <1 Euhderal Dark Gray Microcrystalline 1 0 50 Olivine replaced by and vesicles filled with light green clay mineral. No halo present. 957M 010R 1 1 0 5 5 46.2 46.2 1 Sparsely Phyric Olivine Basalt 0.5 1 2 <1 Euhedral Dark Gray Microcrystalline <1 0 50 Plagioclase appears fresh; olivine replaced by chlorite in sample interiors; vesicles filled by light green mineral. No halo present. 957M 010R 1 2 5 11 6 46.2 46.25 1 Sparsely Phyric Olivine Basalt 0.5 1 2 <1 Euhedral Dark Gray Microcrystalline <1 0 50 Plagioclase appears fresh; olivine replaced by chlorite in sample interiors; vesicles filled by light green mineral. No halo present. 957M 010R 1 3 11 18 7 46.2 46.31 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray Microcrystalline <1 0 50 Plagioclase appears fresh; olivine replaced by chlorite in sample interiors; vesicles filled by light green mineral. No halo present. 957M 010R 1 4 18 23 5 46.2 46.38 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray Microcrystalline <1 0 50 Plagioclase appears fresh; olivine replaced by chlorite in sample interiors; vesicles filled by light green mineral. No halo present. 957M 010R 1 5 23 32 9 46.2 46.43 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray Microcrystalline <1 0 50 Plagioclase appears fresh; olivine replaced by chlorite in sample interiors; vesicles filled by light green mineral. No halo present. 957M 010R 1 6 32 43 11 46.2 46.52 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray with Red Brown Rim Microcrystalline <1 0 50 Plagioclase appears fresh; olivine replaced by chlorite in sample interiors; vesicles filled by light green mineral. Red alteration halo (2 mm wide) is present in which olivines and matrix are replaced by Fe oxyhydroxides. 957M 010R 1 7 43 51 8 46.2 46.63 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray with Red Brown Rim Microcrystalline <1 0 50 Plagioclase appears fresh; olivine replaced by chlorite in sample interiors; vesicles filled by light green mineral. Red alteration halo (2 mm wide) is present in which olivines and matrix are replaced by Fe oxyhydroxides. 957M 010R 1 8 51 60 9 46.2 46.71 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray with Red Brown Rim Microcrystalline <1 0 50 Plagioclase appears fresh; olivine replaced by chlorite in sample interiors; vesicles filled by light green mineral. Red alteration halo (2 mm wide) is present in which olivines and matrix are replaced by Fe oxyhydroxides. 957M 010R 1 9 60 68 8 46.2 46.8 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray with Red Brown Rim Microcrystalline <1 0 50 Subvariolitic texture with varioles present along the edges. Red to yellow alteration rim is present in which olivines and matrix are replaced by Fe oxyhydroxides. 957M 010R 1 10 68 76 8 46.2 46.88 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray with Red Brown Rim Microcrystalline <1 0 50 Subvariolitic to variolitic texture. Red brown alteration rim is present in which olivines and matrix are replaced by Fe oxyhydroxides. 957M 010R 1 11 76 83 7 46.2 46.96 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray with Green Gray Rim Microcrystalline <1 0 50 Olivine replaced by chlorite in sample interiors and Fe oxyhydroxides; vesicles filled by light green mineral. Light green gray alteration halo (2 mm wide) of chlorite with disseminated pyrite; pyrite is oxidized. 957M 010R 1 12A 83 95 12 46.2 47.03 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray with Green Gray Rim Microcrystalline <1 0 70 Subvariolitic texture; plagioclase appears fresh; olivine replaced by chlorite; vesicles filled by light green mineral. Green alteration halo consists of chlorite with disseminated pyrite. 957M 010R 1 12B 83 95 12 46.2 47.15 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray with Green Gray Rim Microcrystalline <1 0 70 Subvariolitic texture; plagioclase appears fresh; olivine replaced by chlorite; vesicles filled by light green mineral. Outer red halo (<1 mm wide) and inner dark green halo (1 mm wide) are present. Inner halo consists of chlorite with disseminated pyrite. 957M 010R 1 13 95 106 11 46.2 47.27 1 Moderately Phyric Olivine Basalt 0 2 1 0.5 lath 1 5 <1 Euhedral Dark Gray Microcrystalline <1 0 50 Plagioclase appears fresh; olivine replaced by chlorite in sample interiors; vesicles filled by light green mineral. No halo present. 957M 010R 1 14 106 111.5 5.5 46.2 47.38 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray Microcrystalline <1 0 50 Plagioclase appears fresh; olivine replaced by chlorite in sample interiors; vesicles filled by light green mineral. No halo present 957M 010R 1 15 111.5 117 5.5 46.2 47.44 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray with Green Gray Rim Microcrystalline <1 0 50 Plagioclase appears fresh; olivine replaced by chlorite and Fe oxyhydroxides; vesicles filled by light green mineral. Outer green halo (5 mm wide) with disseminated pyrite and inner dark green halo (2-3 mm wide) of chlorite are present. 957M 010R 1 16 117 121 4 46.2 47.49 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray with Red Brown Rim Microcrystalline <1 0 50 Variolitic texture; plagioclase appears fresh; olivine replaced by chlorite in sample interiors. 2 large vesicles (2 and 3 mm in diameter) filled with white clay mineral; Red Fe oxyhydroxide halo present. 957M 010R 1 17 121 126 5 46.2 47.53 Silicified Basalt No contact observed Light Gray <1 0 100 Silicified basalt with disseminated pyrite and a chlorite clast. 957M 010R 1 18 126 129 3 46.2 47.58 1 Sparsely Phyric Olivine Basalt No contact observed 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray with Red Brown Rim Microcrystalline <1 0 60 Subvariolitic texture; plagioclase appears fresh; olivine replaced by chlorite; vesicles filled by light green mineral. Red Fe oxyhydroxide halo (1 mm thick) has replaced all olivines and matrix. 957M 010R 1 19 129 132 3 46.2 47.61 Altered Pillow Rim Basalt No contact observed Red Brown to Green Gray <1 0 100 Variolitic basalt with glassy rim that has been altered to chlorite; varioles are replaced by Fe oxyhydroxides. 957M 010R 1 20 132 140 8 46.2 47.64 1 Sparsely Phyric Olivine Basalt No contact observed 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray with Green Gray Rim Microcrystalline <1 0 50 Plagioclase appears fresh; olivine replaced by chlorite in sample interiors; vesicles filled by light green mineral. Outer green halo with pyrite and inner dark green halo are present; olivine replaced by Fe oxyhydroxides near inner halo; chlorite vein (<1 mm thick) cuts across sample. 957M 010R 1 21 140 146 6 46.2 47.72 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray with Green Gray Rim Microcrystalline <1 0 50 Subvariolitic texture; plagioclase appears fresh; olivine replaced by chlorite; vesicles filled by light green mineral. Alteration halo up to 5 mm thick; olivines replaced by Fe oxyhydroxides near halo; varioles are oxidized; fracture (< .5 mm wide) filled with pyrite. 957M 010R 2 1 0 10 10 46.2 47.78 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray with Green Gray Rim Microcrystalline <1 0 50 Plagioclase appears fresh; olivine replaced by chlorite in sample interiors; vesicles filled by light green mineral. Green halo of chlorite with disseminated pyrite is present; fracture filled with chlorite and pyrite; olivine replaced by Fe oxyhydroxides near halo. 957M 010R 2 2 10 15 5 46.2 47.88 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray with Green Gray Rim Microcrystalline <1 0 50 Plagioclase appears fresh; olivine replaced by chlorite in sample interiors; vesicles filled by light green mineral. Outer light green halo of chlorite and disseminated pyrite and inner dark green halo are present. 957M 010R 2 3 15 19.5 4.5 46.2 47.93 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray with Green Gray Rim Microcrystalline <1 0 50 Plagioclase appears fresh; olivine replaced by chlorite in sample interiors; vesicles filled by light green mineral. "Outer green halo (5 mm wide), light gray halo (1-2 mm wide), red halo (1 mm wide), and green halo (1 mm wide) are present. Green halos consist of chlorite with disseminated pyrite." 957M 010R 2 4 19.5 23.5 4 46.2 47.98 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray with Green Gray Rim Microcrystalline <1 0 50 Plagioclase appears fresh; olivine replaced by chlorite in sample interiors; vesicles filled by light green mineral. Light gray halo (3-4 mm wide) consists of chlorite (without pyrite); olivine is replaced by Fe oxyhydroxides near halo. 957M 010R 2 5 23.5 27.5 4 46.2 48.02 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray with Green Gray Rim Microcrystalline <1 0 50 Plagioclase appears fresh; olivine replaced by chlorite in sample interiors; vesicles filled by light green mineral. Alternating green and brown halos (total of 1 cm wide) and inner red halo are present. 957M 010R 2 6 27.5 30.5 3 46.2 48.06 1 Sparsely Phyric Olivine Basalt 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray with Green Gray Rim Microcrystalline <1 0 50 Plagioclase appears fresh; olivine replaced by chlorite in sample interiors; vesicles filled by light green mineral. Alternating green and brown halos (total of 1 cm wide) and inner red halo are present; olivine is replaced by Fe oxyhydroxides near halo. 957M 010R 2 7 30.5 33.5 3 46.2 48.09 Altered Pillow Rim Basalt No contact observed Light green <1 0 100 Subvariolitic texture. "Disseminated pyrite is present; vein is 1-3 mm wide and filled with pyrite, quartz and chlorite; vein has green, light gray, dark gray halos (3 cm wide) present." 957M 010R 2 8 33.5 39 5.5 46.2 48.12 1 Sparsely Phyric Olivine Basalt No contact observed 0 2 1 0.5 lath 1 2 <1 Euhedral Dark Gray Microcrystalline <1 0 50 Plagioclase appears fresh; olivine replaced by chlorite in sample interiors; vesicles filled by light green mineral. No halo present.