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doi:10.2204/iodp.sp.301.2004


Site Summaries (Continued)

Site: DR-1
Priority:
 		Secondary
Position:
 		47°38.810'N, 127°26.999'W;
approved for 500 m radius surrounding position
Water depth (m):
 		2600
Target drilling depth (mbsf):
 		660
Approved maximum penetration (mbsf):
 		660
Survey coverage:
 		EW0207 Line 1, CDP 3070
(track map and seismic profile–Fig. F8)
Objective:
 		Drill into deeply buried basement ridge 125 km from the spreading center, where basement temperatures may approach 100°C, to evaluate the influences of hydrothermal circulation on crustal evolution and microbiology.
Sediment thickness = 610 m
 Basement penetration = 20–50 m
Drilling and logging program:
  • RCB through 610 m of sediment and into uppermost basement
  • If time allows, install cone and casing through sediment
  • Temperature measurements (DVTP)
    • Nature of rock anticipated:
         		Turbidites (sand, silt, clay) and hemipelagic mud, overlying basalt

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