IODP

doi:10.2204/iodp.sp.327.2010

Site summaries (continued)

Proposed Site FR-1A

Priority: Secondary
Position: 47°54.105′N, 128°33.468′W; approved for 500 m radius surrounding position
Water depth (m): 2600
Target drilling depth (mbsf): 110
Approved maximum penetration (mbsf): 110
Survey coverage: InLine 44, TR426 (Track Map and Seismic Profile Fig. F7)
Objective: Core a short series of sediment and shallow basement holes along the first buried basement ridge east of the spreading center to evaluate sediment properties, document fluid chemistry and evidence for along-strike fluid flow, and determine the nature of hydrothermal alteration and microbiology in uppermost basement. Sediment thickness is 40–60 m where basement comes closest to the seafloor.
Drilling and Logging program: • APC/XCB and RCB core through sediments and into uppermost basement
• Core into upper basement
• Collect temperature measurements (SET, APCT3)
See "Operations plan/drilling strategy" and Table T3
Nature of rock anticipated: Turbidites (sand, silt, clay) and hemipelagic mud, overlying basalt