SITE SUMMARIES (continued)Site: PCM-6A
Priority: Alternate for PCM-1A
Position: 3°43.433'S, 151°40.727'E
Water Depth: 1725 m
Sediment Thickness: 0 m
Target Drilling Depth: 700 m
Approved Maximum Penetration: (Not yet approved by SSP, 1348h on Dive 1063, lightly sedimented sheetflow surface)
Seismic Coverage: Sonne SO-94/SCS Leg 2
Objectives: The objectives of PCM-6A are to determine the
1. Volcanic architecture of Pual Ridge;
2. Possible fringes of subsurface alteration system; and
3. Possible evidence for shallow-level seawater input to system.
Drilling Program: TBD after evaluating the results of drilling at Site PCM-2A. Options include bare-hole reentry, free-fall funnel deployment and/or a reentry cone. Requires multiple reentry to achieve depth target.
Logging and Downhole: Fluid and temperature sampling as required. Triple combo, FMS/sonic, logging while drilling.
Nature Of Rock Anticipated: Dacite lavas, some dikes and sills, possible andesite at depth, possible metavolcanic basement. Local altered dacite and mineralized veins.
Site: PCM-7A | Table of Contents