Site Summaries: Site PRU-3A | Table of Contents

Site Summaries

Site: EQP-1A

Priority: Primary
Position: 3°05.70'S, 90°49.08'W
Water Depth: 3296 m
Sediment Thickness: 420 m
Target Drilling Depth: Through sediment-basement transition
Approved Maximum Penetration: 400 m (to 450 m requested from PPSP)
Seismic Coverage: Thomas Washington Venture I line G, same position as ODP Site 846.
See seismic line.

1) Test if the accepted microbial paradigm (of respiration control by standard free energy) is violated by methanogenesis in sulfate-rich open-ocean sediments.
2) Examine how subsurface (up from basement) hydrologic flow affects microbiological community structure and sediment chemistry in relatively organic-poor sediments with sulfate rich pore waters.

Drilling Program: APC to refusal, XCB to and a couple of meters into basement. At least two holes, possibly three. Test site for PCS. May require additional mudline cores.

Logging and Downhole Program: Triple combo, possible FMS, APC-temperature, DVTP, and APC methane tool.

Nature of Rock Anticipated: Carbonate (mostly nannofossil) ooze and siliceous (both diatom and radiolarian) ooze, basaltic basement.

Site Summaries: Site PRU-3A | Table of Contents