Priority:
|
Alternate for proposed Site NT1-03B
|
Position:
|
33°2.000′N, 136°47.403′E
|
Water depth (m):
|
3790
|
Target drilling depth (mbsf):
|
950 sediment (Stage 1)
|
Approved maximum penetration (mbsf):
|
1800; approved by CDEX and TAMU safety panels based on EPSP Jan 2007
recommendation
|
Survey coverage:
|
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)
|
Objective
(see text for full details):
|
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.
|
Drilling, coring, and downhole measurement program:
|
See NT1-03B
|
Anticipated lithology:
|
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
|
