Table T5. Igneous core description logs, Holes 1149B, 1149C, and 1149D.
Core, section |
Piece numbers |
Analysis | Depth (mbsf) | Interval (cm) |
Length (cm) | Subunit number |
Lithology | Texture | Structure | Color | Comments | Chilled margin present | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Top | Bottom | Interval | Unit | Subunit | Top | Base | ||||||||||||
185-1149B- |
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29R-1 | PP | 406.80 | 407.77 | 0-97 | 97 | — | — | — | Sediment | — | Sediment | Pink | Carbonate-rich sediment | — | N | |||
29R-1 | — | 407.77 | 408.28 | 97-148 | 51 | 942 | 78 | 1-1 | Aphyric basalt brecciawith sediment cement | Microcrystalline | Basalt breccia sediment cement | Dark bluish gray and reddish gray | Contact with overlying sediment not observed, altered basalts with halos around veins | N | N | |||
29R-2 | 1 | TSB(2), PP | 408.28 | 408.55 | 0-27 | 27 | 942 | 78 | 1-1 | Pink carbonate cement | Microcrystalline | Dark bluish gray and reddish gray with dark reddish gray veins | Basalt breccia has clasts up to 20 cm and fine-grained pink sedimentary carbonate cement | N | N | |||
29R-2 | 2-10 | — | 408.55 | 409.23 | 27-95 | 68 | 942 | 68 | 1-2 | Aphyric basalt | Microcrystalline | Pillow/flow | Dark bluish gray and reddish gray | Basalt pieces with halos, rubbly interval | N | N | ||
29R-2 | 11-14 | TSB | 409.23 | 409.68 | 95-140 | 45 | 942 | 45 | 1-3 | Aphyric basalt | Hypocrystalline to microcrystalline | Pillow | Dark bluish gray and reddish gray | Dark bluish gray halos around dusky red veins and reddish gray altered basalt, chill at base | N | Y | ||
29R-3 | 1-3 | — | 409.68 | 410.11 | 0-43 | 43 | 942 | 43 | 1-4 | Aphyric basalt | Fine grained to microcrystalline | Pillow | Dark bluish gray and reddish gray | Dark dusky red veins, dark bluish gray halos, reddish gray altered basalt, chill at base | N | Y | ||
29R-3 | 4-8 | XRF | 410.11 | 410.62 | 43-94 | 51 | 942 | 51 | 1-5 | Aphyric basalt | Microcrystalline | Pillow | Dark bluish gray and reddish gray | Dark dusky red veins, dark bluish gray halos, reddish gray altered basalt, rubbly | N | N | ||
30R-1 | 1-9 | — | 416.40 | 416.95 | 0-55 | 55 | 942 | 55 | 1-6 | Aphyric basalt | Microcrystalline | Pillow | Dark bluish gray and reddish gray | Fe oxyhydroxides between reddish gray altered basalt and dark bluish gray halos | N | N | ||
30R-1 | 10A-12 | — | 416.95 | 417.44 | 55-104 | 49 | 942 | 49 | 1-7 | Aphyric basalt | Microcrystalline basalt | Pillow breccia | Dark greenish grey and gray, dusky red | Carbonate cement with <1-cm dusky red and dark green fragments, chilled piece at base | N | Y | ||
30R-1 | 13-19 | — | 417.44 | 417.90 | 104-150 | 46 | 942 | 46 | 1-8 | Aphyric basalt | Fine grained to microcrystalline | Pillow | Dark bluish gray and reddish gray | Dark greenish gray veins, halos present; altered basalt is dark dusky red in some pieces | N | N | ||
30R-2 | 1-4 | XRF | 417.90 | 419.02 | 0-112 | 112 | 942 | 112 | 1-9 | Aphyric basalt | Fine grained to microcrystalline | Pillow/flow | Dark bluish gray and reddish gray | Lower rim of pillow is subvertical and highly irregular | N | Y | ||
30R-2 | 4-7 | — | 419.02 | 419.25 | 112-135 | 23 | 942 | 40 | 1-10 | Aphyric basalt pillows, interpillow breccia | Microcrystalline basalt | Pillow breccia | Dark reddish gray and dark greenish gray, altered pillow rims white carbonate | Carbonate infilling irregular chilled pillow margin | N | N | ||
30R-3 | 1 | — | 419.25 | 419.42 | 0-17 | 17 | 942 | 40 | 1-10 | Carbonate-bearing cement | Coarse carbonate | Various chills and pillow rims, brecciated glassy contact between two pillows at base of subunit | N | N | ||||
30R-3 | 2-9 | — | 419.42 | 419.94 | 17-69 | 52 | 942 | 52 | 1-11 | Aphyric basalt | Microcrystalline | Pillow | Dark reddish gray | Top of Subunit 1-11 is rubbly, chill at top | Y | N | ||
31R-1 | 1-22 | — | 426.00 | 427.20 | 0-120 | 120 | 942 | 120 | 1-12 | Breccia | Microcrystalline to hypocrystalline | Pillow breccia | Dark greenish gray and gray, dusky red | Green concentric alteration in rounded basalt fragments, red matrix, various glassy chills, rubbly | N | N | ||
31R-1 | 23-26 | — | 427.20 | 427.50 | 120-150 | 30 | 942 | 40 | 1-13 | Aphyric basalt | Microcrystalline | Pillow | Gray to light brownish gray | Dusky red veins and carbonate veins, dark bluish gray halos, reddish gray altered basalt, rubbly | N | N | ||
31R-2 | 1 | — | 427.50 | 427.60 | 0-10 | 10 | 942 | 40 | 1-13 | Aphyric basalt | Microcrystalline | Gray to light brownish gray | Fractured carbonate veins, dark bluish gray halos, reddish gray altered basalt | N | N | |||
32R-1 | 1-4 | — | 435.60 | 436.19 | 0-59 | 59 | 942 | 59 | 1-14 | Aphyric basalt | Microcrystalline | Pillow | Reddish gray to greenish gray | Dusky red veins, carbonate veins, dark bluish gray halos, reddish gray altered basalt, rubbly | N | Y? | ||
32R-1 | 5-17 | — | 436.19 | 437.03 | 59-143 | 84 | 942 | 84 | 1-15 | Aphyric basalt | Microcrystalline to fine grained at base | Pillow/flow | Reddish gray to greenish gray | Dusky red veins, carbonate veins, dark bluish gray halos, reddish gray altered basalt, rubbly | Y? | N | ||
185-1149C- | ||||||||||||||||||
9R-1 | — | — | 397.90 | 398.41 | 0-51 | 51 | — | — | — | Sediment | - | Sediment | Beige brown | Cherty sediment | N | N | ||
9R-1 | 1-8 | — | 398.41 | 399.00 | 51-110 | 59 | 399 | 59 | 1-1 | Aphyric basalt | Microcrystalline | Pillow | Dark bluish gray, reddish gray | Contact with overlying cherty sediment not observed, altered basalts with halos around veins, rubbly | N | N | ||
10R-1 | 1-10 | — | 407.50 | 408.22 | 0-72 | 72 | — | 72 | 1-2 | Aphyric basalt | Microcrystalline | Pillow/flow | Dark bluish gray, reddish gray | Chilled pillow rim at top, some carbonate veins, dark bluish gray halos, reddish gray altered basalt | Y | Y | ||
10R-1 |
11-16 | — | 408.22 | 408.55 | 72-105 | 33 | — | 33 | 1-3 | Aphyric basalt | Microcrystalline | Pillow | Dark bluish gray, reddish gray | Chilled pillow rim at top, basalt pieces with halos, contact with carbonate breccia cement at base not chilled | Y | N | ||
10R-1 |
16-22 | — | 408.55 | 409.00 | 105-150 | 45 | — | 87 | 1-4 | Breccia | Microcrystalline basalt fragments | Breccia | Dark bluish gray, reddish gray | Carbonate breccia matrix with 2.5 to 20 cm subangular to angular microcrystalline basalt fragments | N | N | ||
10R-2 | 1-9 | — | 409.00 | 409.42 | 0-42 | 42 | — | 87 | 1-4 | Breccia | Microcrystalline basalt fragments | Breccia | Dark bluish gray, reddish gray | Carbonate breccia matrix with 2.5 to 20 cm subangular to angular microcrystalline basalt fragments | N | N | ||
10R-2 | 9-10 | — | 409.42 | 409.52 | 42-52 | 10 | — | 54 | 1-5 | Aphyric basalt | Fine grained to microcrystalline | Pillow | Dark bluish gray, reddish gray | Dark dusky red veins, dark bluish gray halos, reddish gray altered basalt, rubbly | Y | N | ||
11R-1 |
1A-3 | — | 417.10 | 417.54 | 0-44 | 44 | — | 54 | 1-5 | Aphyric basalt | Fine grained to microcrystalline | Pillow | Dark bluish gray, reddish gray | Dark bluish gray halos around dusky red veins, reddish gray altered basalt, chill at base | N | Y | ||
11R-1 |
3-13 | — | 417.54 | 418.48 | 44-138 | 94 | — | 94 | 1-6 | Aphyric basalt | Fine grained to microcrystalline | Pillow/flow | Dark bluish gray, reddish gray | Altered hyaloclastite at top, dark dusky red veins, dark bluish gray halos, reddish gray altered basalt | Y | N | ||
185-1149D- | ||||||||||||||||||
5R-1 | — | — | 300.30 | 300.46 | 0-16 | 16 | — | — | — | Sediment | Fine-grained chert | Sediment | Red brown | Cherty sediment, contact with basement not recovered | N | N | ||
5R-1 | 1 | — | 300.46 | 300.52 | 16-22 | 6 | 6 | — | 1 | Aphyric basalt | Microcrystalline | Pillow | Dark bluish gray, reddish gray | More olivine phenocrysts, different alteration style | N | N | ||
5R-2 | 2-5 | — | 300.52 | 300.71 | 22-41 | 19 | 747 | 288 | 2-1 | Aphyric basalt | Microcrystalline | Flow | Dark bluish gray, reddish gray | Small pieces with pronounced halos, speckled appearance | N | N | ||
6R-1 | 1-21 | — | 310.00 | 311.34 | 0-134 | 134 | — | Aphyric basalt | Microcrystalline | Flow | Reddish gray, bluish gray | Red veins, halos, speckled appearance, no chills | N | N | ||||
6R-2 | 1-11 | — | 311.34 | 312.40 | 0-106 | 106 | — | Aphyric basalt | Microcrystalline | Flow | Reddish gray, bluish gray | Very pronounced halos, carbonate veins, no chills | N | N | ||||
7R-1 | 1-4 | — | 319.70 | 319.99 | 0-29 | 29 | — | Aphyric basalt | Microcrystalline | Flow | Reddish gray, bluish gray | Fractured pieces with dark red veins and carbonate veins | N | N | ||||
7R-1 | 5 | — | 319.99 | 320.12 | 29-42 | 13 | — | 13 | 2-2 | Hyaloclastite | Hypocrystalline | Breccia | Dark green | Elongate green clasts with red rims, clasts up to 3-4 cm long in a green matrix, cement supported | N | N | ||
7R-1 | 6-7 | — | 320.12 | 320.26 | 42-56 | 14 | — | 14 | 2-3 | Aphyric basalt | Microcrystalline | Pillow | Reddish gray, bluish gray | Two pieces, not oriented; there may be material missing | N | Y | ||
7R-1 | 8-9 | — | 320.26 | 320.40 | 56-70 | 14 | — | 14 | 2-4 | Aphyric basalt | Microcrystalline | Pillow | Reddish gray, bluish gray | Two pieces, not oriented; there may be material missing | Y | N | ||
7R-1 | 10 | — | 320.40 | 320.45 | 70-75 | 5 | — | 5 | 2-5 | Hyaloclastite | Hypocrystalline | Breccia | Dark green and white | Dark green altered glassy clasts; cement is carbonate with some pale greenish clays | N | N | ||
7R-1 | 11-20 | — | 320.45 | 321.20 | 75-150 | 75 | — | 75 | 2-6 | Aphyric basalt | Microcrystalline | Pillow/flow | Reddish gray, bluish gray | Pronounced halos, dark red veins, carbonate veins | N | N | ||
7R-2 | 1-6 | — | 321.20 | 321.75 | 0-55 | 55 | — | 55 | 2-7 | Aphyric basalt | Microcrystalline | Pillow/flow | Reddish gray, bluish gray | Small pieces at top and one fractured piece, pronounced halos, dark red veins, carbonate veins | N | Y | ||
7R-2 | 7-16 | — | 321.75 | 322.40 | 55-120 | 65 | — | 65 | 2-8 | Aphyric basalt | Microcrystalline | Pillow/flow | Reddish gray, bluish gray | 2-cm interpillow material and glass at top, halos, carbonate veins, red veins throughout | Y | Y | ||
7R-2 | 16-20 | — | 322.40 | 322.64 | 120-144 | 24 | — | 53 | 2-9 | Aphyric basalt | Microcrystalline | Pillow/flow | Reddish gray, bluish gray | Rubbly and fractured basalt pieces, chill with small amounts of glass in the top piece | Y | N | ||
7R-3 | 1-3 | — | 322.64 | 322.93 | 0-29 | 29 | — | Aphyric basalt | Microcrystalline | Pillow/flow | Reddish gray, bluish gray | 1-cm-wide vein with carbonate or recrystallized interpillow material and a very small amount of breccia | N | N | ||||
8R-1 | 1-15 | — | 329.30 | 330.80 | 0-150 | 150 | — | 165 | 2-10 | Aphyric basalt | Microcrystalline | Flow | Reddish gray, bluish gray | Pronounced halos, dark red veins, carbonate veins | N | N | ||
8R-2 | 1 | — | 330.80 | 330.95 | 0-15 | 15 | — | Aphyric basalt | Microcrystalline | Flow | Reddish gray, bluish gray | One fractured piece with pronounced halos, dark red veins, carbonate veins | N | N | ||||
8R-2 | 2 | — | 330.95 | 331.35 | 15-55 | 40 | 713 | 40 | 3-1 | Aphyric basalt | Microcrystalline | Pillow | Reddish gray, bluish gray | 4 cm of interpillow material at top with wavy contact; basalt has a slightly speckled appearance | Y | Y | ||
8R-2 | 3 | — | 331.35 | 331.40 | 55-60 | 5 | — | 5 | 3-2 | Hyaloclastite | Microcrystalline basalt | Breccia | Dark green and white | Glass and altered glass clasts in a carbonate matrix | Y | Y | ||
8R-2 | 4-8 | — | 331.40 | 331.81 | 60-101 | 41 | — | 41 | 3-3 | Aphyric basalt | Microcrystalline | Pillow | Reddish gray, bluish gray | Thin dark red veins, carbonate veins, halos present | Y | N | ||
8R-2 | 9-13 | — | 331.81 | 332.22 | 101-142 | 41 | — | 41 | 3-4 | Aphyric basalt | Microcrystalline, hypocrystalline at base | Pillow | Reddish gray, bluish gray | Thin dark red veins, carbonate veins, halos present | Y | N | ||
9R-1 | 1-2 | — | 338.80 | 338.90 | 0-10 | 10 | — | 10 | 3-5 | Aphyric basalt | Microcrystalline | Pillow | Reddish gray, bluish gray | Subvertical glassy chill on Piece 2, dark red veins, carbonate veins, halos present | N | Y | ||
9R-1 | 3-6 | — | 338.90 | 339.15 | 10-35 | 25 | — | 25 | 3-6 | Aphyric basalt | Microcrystalline | Pillow | Reddish gray, bluish gray | Small pieces with chills near vertical pillow contact or pile of pillows with material not recovered | Y | Y | ||
9R-1 | 7-10 | — | 339.15 | 339.46 | 35-66 | 31 | — | 31 | 3-7 | Aphyric basalt | Microcrystalline | Pillow | Reddish gray, orange, bluish gray | Dark bluish gray halos with orange-brown Fe oxyhydroxide zone adjacent to reddish gray basalt | Y | Y | ||
9R-1 | 11-18 | — | 339.46 | 339.98 | 66-118 | 52 | — | 52 | 3-8 | Aphyric basalt | Microcrystalline | Pillow/flow | Reddish gray, orange, greenish gray | Abundant carbonate veins, horizontal glassy chill at the base | Y | Y | ||
9R-2 | 1-4 | — | 339.98 | 340.69 | 0-71 | 71 | — | 71 | 3-9 | Aphyric basalt | Microcrystalline with fine-grained center | Pillow/flow | Reddish gray, bluish gray | Pronounced halos, abundant dark red veins and carbonate veins, horizontal chill at the base | N | Y | ||
9R-2 | 5-16 | — | 340.69 | 341.48 | 71-150 | 79 | — | 79 | 3-10 | Aphyric basalt | Microcrystalline with fine-grained center | Pillow/flow | Reddish gray, bluish gray | Glassy chill on pieces at top and base, thin dark red veins, carbonate veins, halos present | Y | Y | ||
9R-3 | 1-10 | — | 341.48 | 342.13 | 0-65 | 65 | — | 92 | 3-11 | Aphyric basalt | Microcrystalline | Pillow/flow | Reddish gray, bluish gray, gray | Dark bluish gray halos with orange-brown Fe oxyhydroxide zone adjacent to reddish gray basalt, carbonate, red veins | N | N | ||
10R-1 | 1-4 | — | 348.40 | 348.67 | 0-27 | 27 | — | Aphyric basalt | Microcrystalline | Pillow/flow | Reddish gray, bluish gray, gray | Dark bluish gray halos with orange brown Fe oxyhydroxide zone adjacent to reddish gray basalt, carbonate, red veins | N | N | ||||
10R-1 | 5 | — | 348.67 | 348.73 | 27-33 | 6 | — | 6 | 3-12 | Hyaloclastite | Hypocrystalline altered basalt clasts | Breccia | Dark greenish gray, white | Breccia with carbonate matrix and light greenish gray clays, clasts up to 5 cm | N | N | ||
10R-1 | 6A-6C | — | 348.73 | 349.47 | 33-107 | 74 | — | 74 | 3-13 | Aphyric basalt | Microcrystalline with fine-grained center | Pillow/flow | Greenish gray | One coherent piece, halos present but more diffuse | N | N | ||
10R-1 | 7-8 | — | 349.47 | 349.70 | 107-130 | 23 | — | 23 | 3-14 | Aphyric basalt | Microcrystalline | Pillow | Dark greenish gray white, gray | Contains some brecciated pieces with carbonate cement, mix of large fractured clasts and small ones | N | N | ||
10R-1 | 9-10 | — | 349.70 | 349.90 | 130-150 | 20 | — | 35 | 3-15 | Aphyric basalt | Microcrystalline | Pillow | Greenish gray to gray | Pronounced halos, dark red veins, carbonate veins | N | N | ||
10R-2 | 1 | — | 349.90 | 350.05 | 0-15 | 15 | — | Aphyric basalt | Microcrystalline | Pillow | Greenish gray to gray | Pronounced halos, dark red veins, carbonate veins | N | N | ||||
10R-2 | 2-7 | — | 350.05 | 350.49 | 15-59 | 44 | — | 56 | 3-16 | Aphyric basalt | Microcrystalline | Pillow | Greenish gray to gray | Rubbly pieces, some brecciated pieces with carbonate cement | N | N | ||
11R-1 | 1-2 | — | 357.90 | 358.02 | 0-12 | 12 | — | Aphyric basalt | Microcrystalline | Pillow | Greenish gray to gray | Rubbly pieces, some brecciated pieces with carbonate cement | N | N | ||||
11R-1 | 3-6 | — | 358.02 | 358.34 | 12-44 | 32 | — | 32 | 3-17 | Hyaloclastite | Microcrystalline to hypocrystalline clasts, fine clay cement | Breccia | Dark green with weak red alteration | Variable clast size 1 mm up to 5 cm, dark grayish green altered glass clasts with light greenish gray matrix | N | N | ||
11R-1 | 7-14 | — | 358.34 | 359.24 | 44-134 | 90 | 652 | 233 | 4-1 | Aphyric basalt | Microcrystalline to hypocrystalline | Flow | Variable gray to very dark gray | ?Flow top, highly altered with irregular carbonate-filled void spaces, rusty brown to dark brown veins | N | N | ||
11R-2 | 1-10 | — | 359.24 | 360.67 | 0-143 | 143 | — | Aphyric basalt | Microcrystalline to hypocrystalline | Flow | Variable gray to very dark gray | Four thin <5-cm intervals of fine breccia with carbonate cement, highly altered with irregular carbonate-filled voids | N | N | ||||
11R-3 | 1-6 | — | 360.67 | 362.14 | 0-147 | 147 | — | 147 | 4-2 | Breccia | Microcrystalline to hypocrystalline clasts, coarse cement | Breccia | Gray to very dark gray, white | One piece (#4) is similar to hyaloclastite in Subunit 3-17; breccia has subangular frayed clasts of variable size | N | N | ||
11R-4 | 1-6 | — | 362.14 | 362.69 | 0-55 | 55 | — | 91 | 4-3 | Aphyric basalt | Microcrystalline | Flow | Variable gray to very dark gray | Pronounced halos present in some pieces, dark red veins, carbonate veins | N | N | ||
12R-1 | 1-9 | — | 367.40 | 367.76 | 0-36 | 36 | — | Aphyric basalt | Microcrystalline | Flow | Reddish gray, bluish gray, gray | Rubbly subunit with some brecciated pieces, several carbonate-filled voids | N | N | ||||
12R-1 | 9-13 | — | 367.76 | 368.07 | 36-67 | 31 | — | 31 | 4-4 | Aphyric basalt | Microcrystalline | Pillow | Reddish gray, bluish gray, gray | Rubbly subunit with some brecciated pieces, several carbonate-filled voids | Y | N | ||
13R-1 | 1-2 | — | 377.00 | 377.26 | 0-26 | 26 | — | 26 | 4-5 | Hyaloclastite | Microcrystalline to hypocrystalline clasts, fine clay cement | Breccia | Dark green with weak red alteration | Dark greenish gray matrix, variable clast size 1 mm to 5 cm; clasts are subrounded altered glass | N | N | ||
13R-1 | 3-12 | — | 377.26 | 377.83 | 26-83 | 57 | — | 57 | 4-6 | Aphyric basalt | Microcrystalline | Pillow | Variable gray to very dark gray | Fractured rubbly pieces; some are brecciated; carbonate veins present; basalt has a mottled appearance | N | N | ||
13R-1 | 13-16 | — | 377.83 | 378.08 | 83-108 | 25 | — | 25 | 4-7 | Hyaloclastite | Microcrystalline to hypocrystalline clasts, fine clay matrix | Breccia | Dark green and very dark gray | Clast-supported hyaloclastite with small green altered glass clasts and very dark gray basalt clasts up to 5 cm | N | N | ||
13R-1 | 17-22 | — | 378.08 | 378.50 | 108-150 | 42 | — | 42 | 4-8 | Aphyric basalt | Microcrystalline | Pillow | Variable gray to very dark gray | Fractured rubbly pieces, highly altered with mottled appearance, irregular carbonate-filled vesicles up to 1 cm long | N | N | ||
14R-1 | 1-2 | — | 386.60 | 386.72 | 0-12 | 12 | 649 | 12 | 5-1 | Aphyric basalt | Microcrystalline | Pillow | Gray to bluish gray | Rubbly pieces, halos present in some pieces, thin dark red veins, carbonate veins | N | N | ||
14R-1 | 3-4 | — | 386.72 | 386.84 | 12-24 | 12 | — | 12 | 5-2 | Breccia | Microcrystalline to hypocrystalline | Breccia | Dark greenish gray and white | Hyaloclastite with small green altered glass clasts and very dark gray basalt clasts up to 5 cm, carbonate and clay matrix | N | N | ||
14R-1 | 5-8 | — | 386.84 | 387.05 | 24-45 | 21 | — | 21 | 5-3 | Aphyric basalt | Microcrystalline | Pillow | Gray to bluish gray | Rubbly pieces, halos present in some pieces, thin dark red veins, carbonate veins | N | N | ||
15R-1 | 1-3 | — | 396.30 | 396.47 | 0-17 | 17 | — | 17 | 5-4 | Breccia | Microcrystalline | Breccia | Greenish gray to bluish gray | Small rubbly hyaloclastite pieces with green altered glass clasts and very dark gray basalt clasts, green clay cement | N | N | ||
15R-1 | 4-15 | — | 396.47 | 397.26 | 17-96 | 79 | — | 79 | 5-5 | Aphyric basalt | Microcrystalline | Pillow | Gray to bluish gray | Rubbly pieces, pronounced halos present in some pieces, thin dark red veins, carbonate veins | N | N | ||
16R-1 | 1-21 | — | 405.90 | 407.40 | 0-150 | 150 | — | 273 | 5-6 | Breccia | Microcrystalline to hypocrystalline | Breccia | Dark greenish, very dark gray | Clast-supported breccia/hyaloclastite with small green altered glass clasts and very dark gray basalt clasts, variable size | N | N | ||
16R-2 | 1-9 | — | 407.40 | 408.63 | 0-123 | 123 | — | Breccia | Microcrystalline to hypocrystalline | Breccia | Variable very dark gray, white | Clast-supported breccia with very dark gray basalt clasts, variable size, sub-mm to 10 cm, clay and carbonate cement | N | N | ||||
16R-2 | 10-13 | — | 408.63 | 408.88 | 123-148 | 25 | — | 61 | 5-7 | Aphyric basalt | Microcrystalline | Pillow/flow | Gray to bluish gray | Halos present in some pieces, thin carbonate veins, vesicles up to 2 mm in diameter filled with smectite and carbonate | N | N | ||
16R-3 | 1-6 | — | 408.88 | 409.24 | 0-36 | 36 | — | Aphyric basalt | Microcrystalline | Pillow/flow | Gray to bluish gray | Rubbly, halos present in some pieces, thin carbonate veins | N | N | ||||
17R-1 | 1-20 | — | 415.50 | 417.00 | 0-150 | 150 | — | 174 | 5-8 | Breccia | Microcrystalline to hypocrystalline | Breccia | Dark greenish gray, white | Basalt clasts range in size up to 10 cm; halos are present in some of the basalt clasts | N | N | ||
17R-2 | 1-4 | — | 417.00 | 417.24 | 0-24 | 24 | — | Breccia | Microcrystalline to hypocrystalline | Breccia | Dark greenish gray, white | Breccia with carbonate and dark grayish green clay matrix; some parts clast supported, other parts matrix supported | N | N | ||||
17R-2 | 5-14 | — | 417.24 | 417.84 | 24-84 | 60 | 315 | 60 | 6-1 | Aphyric basalt | Microcrystalline | Pillow/flow | Dark gray | Rubbly pieces, pronounced halos present in some pieces, thin dark red veins, carbonate veins, last piece finer grained | N | N | ||
18R-1 | 1-4 | — | 425.10 | 425.52 | 0-42 | 42 | — | 42 | 6-2 | Aphyric basalt | Microcrystalline | Pillow | Dark gray | Pronounced halos present in some pieces, carbonate veins | N | Y | ||
18R-1 | 5-16 | — | 425.52 | 426.49 | 42-139 | 97 | — | 97 | 6-3 | Aphyric basalt | Microcrystalline with fine- grained center | Pillow/flow | Dark gray | Chills at top and base of subunit and subvertical glassy chill on Piece 7, carbonate veins and halos present | Y | Y | ||
19R-1 | 1-5 | — | 434.70 | 434.94 | 0-24 | 24 | — | 24 | 6-4 | Breccia | Microcrystalline clasts | Breccia | Gray to dark gray | Angular basalt clasts up to 5 cm; some contain halos in carbonate cement | N | N | ||
19R-1 | 6-15 | — | 434.94 | 435.47 | 24-77 | 53 | — | 53 | 6-5 | Aphyric basalt | Fine grained tomicrocrystalline | Pillow/flow | Dark gray | Halos present in some pieces, thin dark red veins, carbonate veins | N | Y | ||
19R-1 | 16-22 | — | 435.47 | 435.86 | 77-116 | 39 | — | 39 | 6-6 | Aphyric basalt | Fine grained to microcrystalline | Pillow | Dark gray | Rubbly small pieces, pronounced halos present in some pieces, thin dark red veins, carbonate veins | N | N |
Notes: Lithology is shown diagrammatically in Figure F32C. PP = physical properties, — = no analysis, TSB(2) = second thin section billet, TSB = thin section billet, XRF = X-ray fluorescence, Y = yes, N = no. This table is also available in ASCII format.