169 Prospectus

Site: Hole 857D

Location: Middle Valley, Juan de Fuca Ridge, northeast Pacific Ocean

Priority: 1

Position: 48°26.517'N, 128°42.651'W

Water Depth: 2432 m

Sediment Thickness: 580 m

Total Penetration: 936 to >1050 mbsf

Seismic Coverage: Multichannel Line 89-14

Objectives: remove CORK, deepen and reinstall CORK Hole 857D, conduct hole-to-hole hydrologic experiment.

Drilling Program: Run-in MDCB/RCB to present TD of 936 mbsf, drill for 36 hr, as deep as possible.

Logging and Downhole Operations: Temperature log, water sample, full Schlumberger suite, packer/flowmeter experiment.

Nature of Rock Anticipated: Silicified, hydrothermally altered and metamorphosed interbedded turbidites and hemipelagic sediment alternate with basalt

To Site DD1-4

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