Priority:
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Alternate for proposed Site NT1-07A
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Position:
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32°54.000′N, 136°51.110′E
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Water depth (m):
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4355
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Target drilling depth (mbsf):
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1400 (1300 m sediment)
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Approved maximum penetration (mbsf):
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1500; approved by CDEX and TAMU safety panels based on EPSP Jan 2007 recommendation
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Survey coverage:
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IFREE 3-D 2006 seismic survey; extensive survey data outlined in Proposal 603A-Full2 (www.iodp.org/nantroseize-downloads):
- Track map (Fig. AF4)
- IFREE 3-D Inline 95 (Figs. AF5, AF17)
- IFREE 3-D Crossline 1151 (Fig. AF18)
- 2-D KR Line 0211 (Fig. AF19)
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Objective
(see text for full details):
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Reference site:
- Penetrate entire sedimentary section and into oceanic crust
- Complete characterization of Shikoku Basin strata and upper igneous basement where basement topography is relatively flat
- Document lithologic, hydrologic, thermal, geotechnical, and geochemical properties of subduction inputs
- Log-seismic integration
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Drilling, coring, and downhole measurement program:
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See NT1-07A
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Anticipated lithology:
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0–400 mbsf: upper Shikoku Basin hemipelagics and volcanic ash
400–800 mbsf: lower Shikoku Basin hemipelagics and volcanic ash
800–1200 mbsf: lower Shikoku Basin hemipelagics and turbidite sands
>1200 mbsf: volcaniclastic sediments and basalt
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