IODP

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doi:10.2204/iodp.sp.301.2004


Site Summaries (continued)

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
    • GeoB 00-365
    (track map–Fig F6; seismic profile–Fig. F7)
    • Objective:
         		Drill 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
  • Determine the nature of hydrothermal alteration and microbiology in uppermost basement
     Sediment thickness = 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
  • Temperature measurements (APCT, DVTP)
  • Potential water sampling (WSTP)
    • Nature of rock anticipated:
         		Turbidites (sand, silt, clay) and hemipelagic mud, overlying basal

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