Site summaries (continued)

Proposed Site CRIS-12B

Priority: Alternate
Position: 8°36.45438′N, 84°4.18578′W
Water depth (m): 430
Target drilling depth (mbsf): 770 (550 m sediment, 220 m basement)
Approved maximum penetration (mbsf): 770
Survey coverage: Line BGR 99-7 CMP 2200
• Track map (Fig. AF1)
• Seismic profile (Fig. AF4)
• Location map (Fig. F6)
Objective: Alternate for Site U1380. Characterize upper plate basement and fluid flow.
Drilling, coring, and downhole measurements program: • Hole A: APC to 550 mbsf.
• Hole B: jet-in test for reentry system.
• Hole C: reentry system (20 and 16 inch casing to 260 mbsf).
• Hole C: drill without recovery to 540 mbsf, RCB to 770 mbsf.
• Formation temperature measurements (APCT-3/SET).
• FlexIt core orientation measurements.
• Wireline logging (triple combo-UBI, FMS-sonic, VSI).
Nature of rock anticipated: Sediments: mud and silt, mud-supported breccia. Basement: shaly matrix breccia with carbonate, cherty, and basaltic clasts.