168 Prospectus

Site: PP-1A

Priority: 1
Position: 47°46.52´N; 127°43.52´W
Water Depth: 2683 m
Sediment Thickness: 415 m
Total Penetration: 415 mbsf (stop at first basement penetration)
Seismic Coverage: Line 95-27, SP 420 (Fig. 6A, 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 determination of the lateral thermal and chemical gradients in the upper oceanic crust as well as the buoyancy forces that drive fluid flow. Holes will also extend the overall drilling transect to 3.5 Ma. This hole is situated in a fully buried basement valley and will allow detailed sampling of the sediment section.

Drilling Program: APC/XCB

Logging and Downhole: APC temperature measurements at every or every other core, approximately six temperature probe trips, Quad-combo logging run

Nature of Rock Anticipated: Turbidite sediments, altered basalt

To Site PP-2A

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