IODP

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doi:10.2204/iodp.sp.301.2004


SITE SUMMARIES

Site: SR-1
Priority:
 		Primary
Position:
 		47°45.209'N, 127°45.832'W;
approved for 500 m radius surrounding position
Water depth (m):
 		2611
Target drilling depth (mbsf):
 		730
Approved maximum penetration (mbsf):
 		860
Survey coverage:
 		GeoB 00-466: CDP 557
(track map–Fig. F4; seismic profile–Fig. F5)
Objective:
  • Characterize upper basaltic crust
  • Install long-term borehole observatory (pressure, geochemistry, microbiology)
  • Core and sample sediments
  • Measure downhole formation temperatures
    • Drilling/logging program:
         		Deep Hole:
  • Install reentry cone, 20 inch casing to ~75 mbsf;
  • Install 16 inch casing into top of basaltic basement (~280 mbsf)
  • Install 103/4 inch casing through rubble zone to ~380 mbsf
  • RCB core basaltic crust 390 to ~730 mbsf
  • Wireline log with triple combo and FMS-sonic tool strings and UBI and WST-3
  • Packer experiments
  • Install long-term borehole observatory
     Rubble Hole:
  • Install reentry cone, 20 inch casing to ~75 mbsf
  • Install 16 inch casing into top of basaltic basement (~280 mbsf)
  • Install 103/4 inch casing into rubble zone (~325 mbsf)
  • Packer experiments
  • Install long-term borehole observatory
     Sediments:
  • Core sediment section for geochemical and microbiological experiments
  • Temperature measurements (APCT, DVTP)
  • Potential water sampling (WSTP) and core orientation
  • See "Drilling Strategy;" Table T2
    • Nature of rock anticipated:
         		Turbidites (sand, silt, clay) and hemipelagic mud, overlying basalt

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