Priority:
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Primary for Expedition 320, alternate for Expedition 321
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Position:
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12°04.089´N, 142°09.698´W (WGS-84)
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Water depth (m):
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5132 (6.842 s TWT)
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Target drilling depth (mbsf):
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187 then tag basement
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Approved maximum penetration (mbsf):
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250 (approved by TAMU safety panel based on EPSP June 2006 recommendation)
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Survey coverage
(track map; seismic profile):
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Roger Revelle (7 April 2006; ~6 kt):
• Simrad EM-120 multibeam system
• Knudsen 320B subbottom profiler
• Dual 150 c.i. GI seismic sources
• Scripps 48-channel Geometrics GeoEel
Piston core: 11.3 m (RR0603-11JC)
Primary seismic line: PEAT-1 Line 8 (Figs. F11, F12, F13) (see also report to the EPSP panel, available at eprints.soton.ac.uk/45921)
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Objectives:
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Located on ~53 Ma crust to Intercept the 53–50 Ma interval in basal carbonate sediments above the shallow early Eocene CCD (4200–4300 m) and to obtain and characterize continuous sediment archive to basement.
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Drilling program:
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Preferred:
• Holes A, B, C: APC with core orientation to refusal; XCB to basement; logging in Hole A
Minimum:
• Hole A: APC/XCB to basement
• Holes B and C: wash to 100 m; APC/XCB to basement.
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Downhole measurement program (low priority at this site):
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• Wireline logging: triple combo, FMS-sonic, possibly check shot
• Temperature measurements: 3 APCT-3, 2 DVTP
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Nature of rock anticipated:
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Clay, radiolarian ooze, nannofossil ooze/chalk, possibility of chert strings, hydrothermically altered ridge basalt
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