168 Prospectus

Site: PP-6A

Priority: 2
Position: 47°42.61´N; 127°47.18´W
Water Depth: 2618 m
Sediment Thickness: 0 m
Total Penetration: 100 mbsf
Seismic Coverage: Line 95-23b, SP 70 (Fig. 7, Appendix 1B)

Objectives: At the Permeable Penetrators site relatively rugged relief of the igneous crust is buried by sediment everywhere, except at three small volcanic edifices where fluids vent through the seafloor. Holes spanning the primary basement relief will allow the buoyancy forces that drive fluid flow to be determined; holes into one of the permeable basement outcrops will allow the rate and history of discharge to be determined. The holes will extend the overall drilling transect to 3.5 Ma. This hole would be drilled directly into the summit of a nearly fully buried basement edifice where a long history of basement fluid venting maybe recorded. Venting is known to be active.

Drilling Program: RCB (bare-rock spud-in)

Logging and Downhole: Possibly one temperature probe trip

Nature of Rock Anticipated: Highly altered basalt, hydrothermal precipitates

To Site PP-7A, PP-8A, PP-9A transect

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