Site summaries (continued)

Proposed Site NT1-03B
Chikyu Expedition 314 (LWD)
Chikyu Expedition 316 (Thrust Faults)
33°1.635′N, 136°47.639′E
Water depth (m)
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 survey; extensive survey data outlined in Proposal 603A-Full2 (
• Track map (Fig. AF15)
• CDEX/IFREE 3-D inline (Fig. AF16)
(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:
Chikyu Expedition 314 (LWD):
• Pilot hole - MWD
• Hole A - MWD/LWD to TD
Chikyu Expedition 316 (Thrust Faults):
Hole B (if TD cannot be achieved, start Hole C):
• Core orientation
• Downhole temperature measurements
Hole C:
• Drill without coring to depth of Hole B
• RCB core to TD
• Wireline logging as contingency if Expedition 314 LWD is not accomplished
Anticipated lithology:
0–20 mbsf: hemipelagics and volcanic ash
20–600 mbsf: uplifted trench turbidites
~600 mbsf: frontal thrust
600–1100 mbsf: trench wedge turbidites
1100–1400 mbsf: upper Shikoku Basin hemipelagics and volcanic ash
1400–2800 mbsf: lower Shikoku Basin hemipelagics and turbidites