Site summaries (continued)

Proposed Site GOAL-18A

Priority: Alternate
Position: 56°57.3852′N, 147°8.2545′W
Water depth (mbrf): 4229
Target drilling depth (mbsf): 780 (sediment/basalt interface at 777 mbsf)
Approved maximum penetration (mbsf): 856
Survey coverage: Inline MGL1109MCS01 (Shotpoint 1423), Xline L-6-81 line 678-04/05 (JD157 06:37) (navigation and bathymetric maps Figs. AF18, AF19; seismic profiles Figs. AF21, AF22)
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 780 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 T2
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 T2
Anticipated lithology: Mud (possibly diatom rich), silt, fine sand, volcanic ash, ice-rafted debris, basalt