Priority:
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Primary:
- Chikyu Expedition 314 (LWD)
Alternate:
- Other Stage 1 expeditions
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Position:
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32°49.7300′N, 136°52.8900′E
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Water depth (m):
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4062
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Target drilling depth (mbsf):
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1200 m sediment (stop at basement contact)
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Approved maximum penetration (mbsf):
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1400; approved by CDEX and TAMU safety panels based on EPSP Jan 2007 recommendation
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Survey coverage:
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Extensive survey data outlined in Proposal 603A-Full2 (www.iodp.org/nantroseize-downloads):
- Track maps (Figs. AF20, AF4)
- Line odkm 03-101 SP 2524 (Fig. AF21)
- IFREE 3-D InLine 95 (Figs. AF5, AF22)
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Objective
(see text for full details):
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Reference site:
- Penetrate entire sedimentary section
- Complete characterization of Shikoku Basin strata and upper igneous basement where basement topography is relatively flat and the lower Shikoku Basin sand facies is well-developed
- 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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Chikyu Expedition 314 (LWD):
Hole A - MWD/LWD to basement contact
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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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