Priority:
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Alternate for proposed Site NT1-03B
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Position:
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33°01.23258′N, 136°47.94852′E
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Water depth (m):
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3955
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Target drilling depth (mbsf):
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600 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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Extensive survey data outlined in Proposal 603A-Full2 (www.iodp.org/nantroseize-downloads):
- Track maps (Figs. AF11, AF4)
- Lines odkm 03-K SP 2435 (Fig. AF12) and 95 (Fig. AF5)
- CrossLine KR9806-12 (Fig. AF13)
- IFREE 3-D Inline (Fig. AF14)
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Objective
(see text for full details):
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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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0–20 mbsf: hemipelagics
200–400 mbsf: uplifted trench turbidites
~400 mbsf: frontal thrust
400–830 mbsf: trench wedge turbidites
830–1050 mbsf: upper Shikoku Basin hemipelagics and volcanic ash
1050–2700 mbsf: lower Shikoku Basin hemipelagics and turbidites
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