Site Summaries
Site: ODP Site 850
Priority: Alternate
Position: 1°17.83'N, 110°31.29'W
Water Depth: 3786 m
Sediment Thickness: 400 m
Target Drilling Depth: Through sediment-basement transition (>400 m)
Approved Maximum Penetration: Requested same maximum penetration as for Leg 138.
Seismic Coverage: Single-channel seismic collected onboard JOIDES Resolution on approach to
site.
See seismic line.
Objectives: Nonideal alternate for Site EQP-2A. Methane and high sulfate co-occur (methane approaches 40 µL/L). Pore water profiles indicate basement flow. Three chert layers in the Site 850 interval from Core 138-850C-36X to Core 138-850C-41X (~360 to 390 mbsf) limit pore water geochemical 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: Nannofossil ooze and chert.
