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Priority:
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Alternate
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Position:
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56°56.2543′N, 147°23.7345′W
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Water depth (m):
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4273
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Target drilling depth (mbsf):
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758 (755 m sediment; 3 m basement)
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Approved maximum penetration (mbsf):
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834
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Survey coverage (track map, seismic profile):
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Langseth seismic Profile MGL1109MCS01 (Shotpoint 1748) and crossline Farnella seismic Profile F-689 Line 13 (CDP 5380; ~800 m away, as site is moved off the line crossing by EPSP request) (navigation maps, Figs. F1 and F2; seismic profiles, Figs. F3 and F4)
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Objective(s):
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• Tectonic and climate history from 10 Ma to recent
• Provenance of unroofed sediments
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Drilling program:
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• Hole A: APC to ~200 mbsf with nonmagnetic core barrels and core orientation
• Hole B: APC to ~200 mbsf with nonmagnetic core barrels
• Hole C: APC/XCB to 758 mbsf with nonmagnetic core barrels
• Hole D: APC/XCB to 500 mbsf with nonmagnetic core barrels
• Similar to originally proposed Site GOA18-1A (see “Drilling and coring strategy” and Table T3 in Jaeger et al., 2011)
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Logging program or
downhole measurements program:
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• Hole A: APCT-3 (SET if needed) formation temperature measurements
• Hole C: wireline logging with triple combo, FMS-sonic, VSI, and magnetic properties tool strings
• Similar to originally proposed Site GOA18-1A (see “Drilling and coring strategy” and Table T3 in Jaeger et al., 2011)
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Nature of rock anticipated:
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Mud (possibly diatom rich), silt, fine sand, volcanic ash, ice-rafted debris, basalt
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