Priority:
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Alternate for proposed Site NT1-03B
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Position:
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33°2.000′N, 136°47.403′E
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Water depth (m):
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3790
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Target drilling depth (mbsf):
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950 sediment (Stage 1)
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Approved maximum penetration (mbsf):
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1800; approved by CDEX and TAMU safety panels based on EPSP Jan 2007 recommendation
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Survey coverage:
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CDEX 2006 3-D MCS; extensive survey data outlined in Proposal 603A-Full2 (www.iodp.org/nantroseize-downloads):
- Track map (Fig. AF15)
- CDEX/IFREE 3-D inline (Fig. AF16)
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Objective
(see text for full details):
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Penetrate the toe of the Nankai accretionary prism to:
- Characterize incoming sedimentary sequence (lithologic, hydrologic, thermal, geotechnical, geochemical properties)
- Document early phases of deformation
- Verify location of frontal décollement
Although penetration to basement is desirable, a more important goal is to sample as much of the lower Shikoku Basin as possible.
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Drilling, coring, and downhole measurement program:
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See NT1-03B
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Anticipated lithology:
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0–200 mbsf: hemipelagics and slumped trench material
200–850 mbsf: uplifted trench turbidites
~850 mbsf: frontal thrust
850–1290 mbsf: trench wedge turbidites
1290–1550 mbsf: upper Shikoku Basin hemipelagics and volcanic ash
1550–2920 mbsf: lower Shikoku Basin hemipelagics and turbidites
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