Site: DR-2
Priority:
Secondary
Position:
47°37.449'N, 127°20.049'W;
approved for 500 m radius surrounding position
Water depth (m):
2600
Target drilling depth (mbsf):
940
Approved maximum penetration (mbsf):
940
Survey coverage:
EW0207 Line 1, CDP 1720
(track map and seismic profile–Fig. F8)
Objective:
Drill into deeply buried basement ridge 145 km from the spreading center, where basement temperatures may approach 140°C, to evaluate the influences of hydrothermal circulation on crustal evolution and microbiology.
Sediment thickness = 890 m
Basement penetration = 20–50 m
Drilling and logging program:
• RCB through 910 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