IODP Proceedings, Volume 335 Deep drilling of intact ocean crust: harnessing past lessons to inform future endeavors, Table T1. Drill holes into oceanic basement in intact crust and tectonically exposed lower crust and upper mantle. Compilation does not include other “hard rock” drill holes in oceanic plateaus, arc basement, hydrothermal mounds, or passive margins. S = slow, I = intermediate, F = fast. MARK = Mid-Atlantic Ridge Kane Fracture Zone. CORK = circulation obviation retrofit kit. Leg/Expedition Hole Latitude Longitude Ocean Water depth (m) Age (m.y.) Sediment thickness (m) Basement penetration (m) Recovery (%) Spreading rate (S/I/F 40/80) Comments Lithology 24 238 11°09.21'S 70°31.56'E Indian 2844.5 30 506 81 50 S/I Projection of Chagos-Laccadive Plateau Basaltic lavas 26 257 30°59.16'S 108°20.99'E Indian 5278 120 262 65 50 S/I Wharton Basin off Perth, Australia Basalt and breccia 34 319A 13°01.04'S 101°31.46'W Pacific 4296 16 98 59 25 F Bauer Deep, 13°S East Pacific Rise Basaltic lavas 37 332A 36°52.72'N 33°38.46'W Atlantic 1851 3.5 104 331 10 S Mid-Atlantic Ridge 36°–37°N Basalt, basalt breccia, and interlayered sediments 37 332B 36°52.72'N 33°38.46'W Atlantic 1983 3.5 149 583 21 S Mid-Atlantic Ridge 36°–37°N Basalt and basalt breccia 37 333A 36°50.45'N 33°40.05'W Atlantic 1665.8 3.5 218 311 8 S Mid-Atlantic Ridge 36°–37°N Basalt and basalt breccia 37 335 37°17.74'N 35°11.92'W Atlantic 3188 15 454 108 38 S Mid-Atlantic Ridge 36°–37°N Basaltic lavas 45 395A 22°45.35'N 46°04.90'W Atlantic 4485 7.3 92 571 18 S Mid-Atlantic Ridge 23°N Basaltic lavas and breccia 45 396 22°58.88'N 43°30.95'W Atlantic 4450 9 126 96 33 S Mid-Atlantic Ridge 23°N Basaltic lavas 46 396B 22°59.14'N 43°30.90'W Atlantic 4459 13 151 255 23 S Mid-Atlantic Ridge 23°N Basalt and breccia 49 410A 45°30.53'N 29°28.56'W Atlantic 2987 9 331 49 38 S Mid-Atlantic Ridge 45°N Basaltic lavas 49 412A 36°33.74'N 33°09.96'W Atlantic 2626 1.6 163 131 18 S Mid-Atlantic Ridge 33°N Basalt flows and intercalating limestone 51–53 417A 25°06.63'N 68°02.48'W Atlantic 5478.2 110 208 209 61 S Western Atlantic Basaltic lavas 51–53 417D 25°06.69'N 68°02.81'W Atlantic 5489 110 343 366 70 S Western Atlantic Basaltic lavas 51–53 418A 25°02.10'N 68°03.44'W Atlantic 5519 110 324 544 72 S Western Atlantic Basaltic lavas 54 428A 09°02.77'N 105°26.14'W Pacific 3358.5 2.3 63 53 39 F 9°N East Pacific Rise Basaltic lavas 63 469 32°37.00'N 120°32.90'W Pacific 3802.5 17 391 63 34 I Off California coast Basaltic lavas 63 470A 28°54.46'N 117°31.11'W Pacific 3554.5 15 167 49 33 I Off California coast Basaltic lavas 65 482B 22°47.38'N 107°59.60'W Pacific 3015 0.5 137 93 54 I Off Gulf of California Massive basalt and interlayered sediment 65 482D 22°47.31'N 107°59.51'W Pacific 3015 0.5 138 50 50 I Off Gulf of California Massive basalt and interlayered sediment 65 483 22°53.00'N 108°44.90'W Pacific 3084 2 110 95 40 I Off Gulf of California Massive basalt and pillow basalt with interlayered sediments 65 483B 22°52.99'N 108°44.84'W Pacific 3084 2 110 157 47 I Off Gulf of California Massive basalt and pillow basalt with interlayered sediments 65 485A 22°44.92'N 107°54.23'W Pacific 2996.5 1.2 153.5 178 51 I Off Gulf of California Massive basalt and interlayered sediments 68 501 1°13.63'N 83°44.06'W Pacific 3466.9 6.6 264 73 60 I South flank of Costa Rica Rift Basaltic lavas 69/70/83/111/137/140/148 504B 1°13.611'N 83°43.818'W Pacific 3474 6.6 270 1841 20 I South flank of Costa Rica Rift Basalt, stockwork, and diabase 82 559 35°07.45'N 40°55.00'W Atlantic 3754 35 238 63 37 S West flank of Mid Atlantic Ridge 35°N Basaltic lavas 82 562 33°08.49'N 41°40.76'W Atlantic 3172 12 240 90 45 S West flank of Mid Atlantic Ridge 33°N Pillow basalt and massive basalt 82 564 33°44.36'N 43°46.03'W Atlantic 3820 35 284 81 43 S West flank of Mid Atlantic Ridge 34°N Pillow basalt and minor massive basalt 91 595B 23°49.34'S 165°31.61'W Pacific 5615 80 70 54 28 F Central South Pacific Vesicular aphyric basalt 92 597C 18°48.43'S 129°46.22'W Pacific 4164 30 53 91 53 F West flank South East Pacific Rise 18°S Massive basalt flows 106/109 648B 22°55.32'N 44°56.825'W Atlantic 3326 0 0 50 12 S Mid-Atlantic Ridge 23°N Pillow basalt 109 670A 23°9.996'N 45°1.932'W Atlantic 3625 0 0 77 6 S Mid-Atlantic Ridge, MARK, 23°N Serpentinized peridotite 118/176 735B 32°43.395'S 57°15.959'E Indian 720 11.8 0 1508 86 S Atlantis Bank, Southwest Indian Ridge Gabbro 123 765D 15°58.56'S 117°34.51'E Indian 5713.8 140 928 267 31 F Argo Abyssal Plain North–east mid-ocean-ridge basaltic lavas 129/185 801C 18°38.538'N 156°21.59'E Pacific 5674 170 462 414 47 F Western North Pacific Pillow basalt, basalt flows, and breccias 129 802A 12°5.778'N 153°12.63'E Pacific 5980 120 509 51 33 F Western North Pacific Basaltic lavas 136 843B 19°20.54'N 159°5.68'W Pacific 4418 95 243 71 37 F West of Hawaii Basaltic lavas 147 894E 2°18.059'N 101°31.524'W Pacific 3014 1 0 29 11 F Hess Deep Gabbro 147 894F 2°17.976'N 101°31.554'W Pacific 3025 1 0 26 7 F Hess Deep Gabbro 147 894G 2°17.976'N 101°31.554'W Pacific 3023 1 0 127.5 35 F Hess Deep Gabbro 147 895A 2°16.638'N 101°26.766'W Pacific 3821 1 0 17 14 F Hess Deep Serpentinized peridotite 147 895B 2°16.638'N 101°26.760'W Pacific 3821 1 0 10 10 F Hess Deep Serpentinized peridotite 147 895C 2°16.632'N 101°26.772'W Pacific 3820 1 0 38 15 F Hess Deep Serpentinized peridotite 147 895D 2°16.638'N 101°26.778'W Pacific 3821 1 0 94 20 F Hess Deep Serpentinized peridotite 147 895E 2°16.788'N 101°26.790'W Pacific 3753 1 0 88 37 F Hess Deep Serpentinized peridotite 147 895F 2°16.902'N 101°26.790'W Pacific 3693 1 0 26 8 F Hess Deep Serpentinized peridotite 148 896A 1°13.006'N 83°43.392'W Pacific 3459 6.6 179 290 27 I South flank of Costa Rica Rift Basaltic lavas 153 920B 23°20.310'N 45°1.038'W Atlantic 3339 <1 0 126.4 35.3 S Mid-Atlantic Ridge, MARK, 23°N Serpentinized peridotite 153 920D 23°20.322'N 45°1.044'W Atlantic 3338 <1 0 200.8 47.3 S Mid-Atlantic Ridge, MARK, 23°N Serpentinized peridotite 153 921A 23°32.460'N 45°1.866'W Atlantic 2488 <1 0 17.1 18.1 S Mid-Atlantic Ridge, MARK, 23°N Gabbro 153 921B 23°32.478'N 45°1.842'W Atlantic 2490 <1 0 44.1 19.4 S Mid-Atlantic Ridge, MARK, 23°N Gabbro 153 921C 23°32.472'N 45°1.830'W Atlantic 2495 <1 0 53.4 11.4 S Mid-Atlantic Ridge, MARK, 23°N Gabbro 153 921D 23°32.442'N 45°1.830'W Atlantic 2514 <1 0 48.6 12.7 S Mid-Atlantic Ridge, MARK, 23°N Gabbro 153 921E 23°32.328'N 45°1.878'W Atlantic 2456 <1 0 82.6 21.4 S Mid-Atlantic Ridge, MARK, 23°N Gabbro 153 922A 23°33.162'N 45°1.926'W Atlantic 2612 <1 0 14.6 63.2 S Mid-Atlantic Ridge, MARK, 23°N Gabbro 153 922B 23°31.368'N 45°1.926'W Atlantic 2612 <1 0 37.4 25.6 S Mid-Atlantic Ridge, MARK, 23°N Gabbro 153 923A 23°32.556'N 45°1.896'W Atlantic 2440 <1 0 70 57.2 S Mid-Atlantic Ridge, MARK, 23°N Gabbro 153 924B 23°32.460'N 45°0.858'W Atlantic 3170 <1 0 30.8 8.7 S Mid-Atlantic Ridge, MARK, 23°N Gabbro 153 924C 23°32.496'N 45°0.864'W Atlantic 3177 <1 0 48.5 23.1 S Mid-Atlantic Ridge, MARK, 23°N Gabbro 168 1025C 47°53.250'N 128°38.880'W Pacific 2602 1.237 106 41 37 I Juan de Fuca Flank Basalt 168 1026B 47°45.759'N 127°45.552'W Pacific 2658 3.511 256 39 5 I Juan de Fuca Flank Basalt 168 1026C 47°46.261'N 127°45.186'W Pacific 2669 3.516 229 19 3.5 I Juan de Fuca Flank Basalt 168 1032A 47°46.776'N 128°7.320'W Pacific 2645 2.621 290 48 6.5 I Juan de Fuca Flank Basalt 179 1105A 32°43.135'S 57°16.652'E Indian 714 11.8 0 158 75 S Atlantis Bank, Southwest Indian Ridge Gabbro 185 1149D 31°18.79'N 143°24.03'E Pacific 5818 133 307 133 17 F Western North Pacific Pillow basalt, basalt flows, and breccias 187 1162B 44°37.9'S 129°11.3'E Indian 5464 18 333 59 17 I Australian-Antarctic Discordance Basaltic lavas and breccia 187 1163A 44°25.5'S 126°54.5'E Indian 4354 17 161 47 33 I Australian-Antarctic Discordance Basaltic lavas 187 1164B 43°45.0'S 127°44.8'E Indian 4798 18.5 150 66 16 I Australian-Antarctic Discordance Basaltic lavas 191 1179D 41°04.8'N 159°57.8'E Pacific 5563.9 129 377 98 44 F Western North Pacific Basaltic lavas 200 1224F 27°53.36'N 141°58.77'W Pacific 4967.1 46 28 147 26 F Central Pacific Basaltic lavas 203 1243B 5°18.07'N 110°04.58'W Pacific 3868 11 110 87 25 F Western flank East Pacific Rise 5°N Basaltic lavas 206 1256C 6°44.18'N 91°56.06'W Pacific 3634.7 15 251 89 61 F Cocos plate eastern flank East Pacific Rise Basaltic lavas 206/309/312 1256D 6°44.16'N 91°56.06'W Pacific 3634.7 15 250 1257.1 37.1 F Cocos plate eastern flank East Pacific Rise Basaltic lavas, sheeted dike, and varitextured gabbro 209 1268A 14°50.755'N 45°4.641'W Atlantic 3007 0 147.6 53.3 S Mid-Atlantic Ridge 15°20'N Serpentinized peridotite 209 1270A 14°43.342'N 44°53.321'W Atlantic 1951 0 26.9 12.2 S Mid-Atlantic Ridge 15°20'N Gabbro 209 1270B 14°43.265'N 44°53.225'W Atlantic 1909 0 45.9 37.4 S Mid-Atlantic Ridge 15°20'N Gabbro 209 1270C 14°43.284'N 44°53.091'W Atlantic 1822 0 18.6 10.6 S Mid-Atlantic Ridge 15°20'N Gabbro 209 1270D 14°43.270'N 44°53.084'W Atlantic 1817 0 57.3 13.4 S Mid-Atlantic Ridge 15°20'N Gabbro 209 1271A 15°2.222'N 44°56.887'W Atlantic 3612 0 44.8 12.9 S Mid-Atlantic Ridge 15°20'N Serpentinized peridotite 209 1271B 15°2.189'N 44°56.912'W Atlantic 3585 0 103.8 15.3 S Mid-Atlantic Ridge 15°20'N Serpentinized peridotite 209 1272A 15°5.666'N 44°58.300'W Atlantic 2560 0 131 28.6 S Mid-Atlantic Ridge 15°20'N Serpentinized peridotite 209 1274A 15°38.867'N 46°40.582'W Atlantic 3940 0 155.8 22.2 S Mid-Atlantic Ridge 15°20'N Serpentinized peridotite 209 1275B 15°44.486'N 46°54.208'W Atlantic 1562 0 108.7 43.1 S Mid-Atlantic Ridge 15°20'N Gabbro 209 1275D 15°44.440'N 46°54.217'W Atlantic 1554 0 209 50 S Mid-Atlantic Ridge 15°20'N Gabbro 301 U1301A 47°45.209'N 127°45.833'W Pacific 2656 3.5 262 108 0 I Juan de Fuca Ridge flank; no coring (CORK) Basaltic lavas 301 U1301B 47°45.229'N 127°45.826'W Pacific 2655 3.5 265 318 12.9 I Juan de Fuca Ridge flank; recovery is only for the 232 m of cored basement Basaltic lavas 304 U1309B 30°10.108'N 42°7.110'W Atlantic 1642 2 2 99.8 45.9 S Mid-Atlantic Ridge 30°N Gabbro 304/305 U1309D 30°10.120'N 42°7.113'W Atlantic 1645 2 2 1413.3 74.8 S Mid-Atlantic Ridge 30°N Gabbro 327 U1362A 47°45.663'N 127°45.672'W Pacific 2661 3.5 236 292 29.6 I Juan de Fuca Ridge flank; recovery is only for the 150 m of cored basement Basaltic lavas