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