Site Summaries
Site: ODP Site 849
Priority: Alternate
Position: 0°10.98'N, 110°31.18'W
Water Depth: 3839 m
Sediment Thickness: 350 m
Target Drilling Depth: Through sediment-basement transition (>350 m)
Approved Maximum Penetration: Requested same maximum penetration as for Leg 138.
Seismic Coverage: Thomas Washington station 6, 0805UTC, 09 September 1989.
See seismic line.
Objectives: Nonideal alternate for Site EQP-2A. Methane and high sulfate co-occur here (methane approaches 50 µL/L). Pore water profiles indicate basement flow. A pronounced chert layer at 237 mbsf greatly hinders pore water geochemical (and microbiological?) communication between the shallower sediments in diffusional contact with the sediment/water interface and the deeper sediments in diffusional contact with the basement.
Drilling Program: TBD
Logging and Downhole Program: TBD
Nature of Rock Anticipated: Diatom nannofossil ooze.
