Position: 47°46.79´N; 127°44.85´W
Water Depth: 2681 m
Sediment Thickness: 185 m
Total Penetration: 185 mbsf (stop at first basement recovery).
Seismic Coverage: Line 95-27, SP 350 (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 igneous crust, and the buoyancy forces that drive fluid flow. The holes will also extend the overall drilling transect to 3.5 Ma. This hole is located at the summit of the buried basement ridge and with Sites PP-1A and PP-2A completes the coring transect from the valley to the ridge.
Drilling Program: APC/XCB
Logging and Downhole: APC temperature measurements at every or every other core, approximately five temperature probe trips
Nature of Rock Anticipated: Turbidite sediments, altered basalt
To Site PP-4A
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