Site Summaries
Site: PRB-2A
Priority: Primary
Position: 12°01.29'S, 81°54.24'W
Water Depth: 4827 m
Sediment Thickness: 124 m
Target Drilling Depth: Through sediment-basement transition
Approved Maximum Penetration: 124 m (to 150 m requested to PPSP)
Seismic Coverage: Kana Keoki Leg 7 single-channel seismic profiles and single-channel and
3.5kHz profiles collected during DSDP Leg 34, same position as DSDP Site 321.
See seismic line.
Objective: Test how Mn-reducing microbial communities in very organic-poor relatively deeply buried marine sediments differ from other environments studied during this expedition.
Drilling Program: APC to refusal, XCB to TD. At least two holes, possibly three. Possible MDCB/RCB coring to improve recovery. Possible PCS deployment. May require additional mudline cores.
Logging and Downhole Program: APC-temperature, DVTP, and APC methane tool.
Nature of Rock Anticipated: Siliceous clay, nannofossil ooze, basaltic basement.
