Site summaries (continued)

Site JA-3A

Priority: Alternate
Position: 40°3.00′N, 51°37.00′W
Water depth (mbrf): 4725
Target drilling depth (mbsf): 250
Approved maximum penetration (mbsf): Request 700; pending EPSP approval
Survey coverage: •Primary line: KNR 179-1, Line 5, SP 203 2314
•Crossing lines: KNR 179-1, Line 12, SP 206 0645
Objective: Lower end of depth transect; lower to upper Eocene and possible Eocene/Oligocene boundary (the entire section of Eocene strata is ~400 m thick at this site, with another 350 m of Cretaceous–early Paleogene); early Eocene warm period; Eocene hyperthermals; middle and late Eocene impacts; transition to icehouse climate; Eocene CCD; chemistry of Eocene deep water. Thinning of Eocene section from JA-7 suggests the site is within the Eocene lysocline but still has a respectable Eocene sediment cover.
Coring program: •Hole A: APC/XCB to 250 mbsf with orientation and APCT-3
•Hole B: APC/XCB to 250 mbsf
•Hole C: APC/XCB to 250 mbsf
•See “Drilling strategy” and Tables T1, T3
Wireline logging program: •NA
•See “Downhole measurements strategy” and Tables T1, T3
Anticipated lithology: Carbonate ooze, hemipelagic clay, shallow-water carbonates