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