Site summaries (continued)

Site JA-15A

Priority: Alternate
Position: 40°10.00′N, 51°50.00′W
Water depth (mbrf): 4290
Target drilling depth (mbsf): 200, possibly 400
Approved maximum penetration (mbsf): Request 500; pending EPSP approval
Survey coverage: •Primary line: KNR 179-1, Line 7, SP 204 0840
•Crossing line: KNR 179-1, Line 16, SP 206 1605
Objective: Middle of depth transect; lower to upper Eocene and possible Eocene/Oligocene boundary. The entire section of Eocene strata is ~200 m thick at this site, and the Eocene section is probably contaminated with younger sediments because the site sits in a basin; however, this site has ~250 m of Cretaceous–Paleogene strata under ~200 m burial. These strata crop out just north of JA-4 (where there is ~300 m of Cretaceous–Paleogene sediments), but we have no crossing line.
Coring program: •Hole A: APC/XCB to 200 mbsf with orientation and APCT-3
•Hole B: APC/XCB to 200 mbsf
•Hole C: APC/XCB to 200 mbsf
•See “Drilling strategy” and Tables T1, T3
Wireline logging program: •If deeper drilling, logging with triple combo and FMS-sonic
•See “Downhole measurements strategy” and Tables T1, T3
Anticipated lithology: Carbonate ooze, hemipelagic clay, shallow-water carbonates