Site summaries (continued)

Proposed Site GOA18-1A

Priority: Alternate
Position: 56°56.3571′N, 147°22.3703′W
Water depth (mbrf): 4273
Target drilling depth (mbsf): 758 (sediment/basalt interface at 755 mbsf)
Approved maximum penetration (mbsf): 834 (pending EPSP review)
Survey coverage: Inline MGL1109MCS01 (Shotpoint 1720), Xline F-6-89 line 13 (CDP 5380) (navigation and bathymetric maps Figs. AF18, AF20; seismic profiles Figs. AF21, AF23)
Objective: • Tectonic and climate history from 10 Ma to recent
• Provenance of unroofed sediments
Drilling and coring program: • Hole A: APC to ~200 mbsf with non-magnetic core barrels and core orientation
• Hole B: APC to ~200 mbsf with non-magnetic core barrels
• Hole C: APC/XCB to 758 mbsf with non-magnetic core barrels
• Hole D: APC/XCB to 500 mbsf with non-magnetic core barrels
• See “Drilling and coring strategy” and Table T3
Downhole measurements program: • 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
• See “Downhole measurements strategy” and Table T3
Anticipated lithology: Mud (possibly diatom rich), silt, fine sand, volcanic ash, ice-rafted debris, basalt