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