Priority:
|
Contingency:
• Chikyu Expedition 319 (riser and riserless observatory)
• Chikyu Expedition 322 (subduction inputs)
|
Position:
|
32°44.8878′N, 136°55.0236′E
|
Water
depth (m):
|
3610
|
Target
drilling
depth
(mbsf):
|
600
|
Approved
maximum
penetration
(mbsf):
|
800; waiting for final approval by EPSP
|
Survey
coverage:
|
Extensive survey data outlined in Proposal 603A-Full2:
• Track map (Fig. AF2)
• Line ODKM03-AB Shotpoint 2795 (Fig. AF3)
• Crossing Line ODKM03-22 Shotpoint 1685 (Fig. F14)
• IFREE 3-D Line 95 (Fig. F13)
|
Objective
(see text for
full details):
|
Reference site:
• Penetrate entire sedimentary section to oceanic crust
• Characterize Shikoku Basin strata and upper igneous
crust where bathymetry is associated with a basement high
• Document lithologic, hydrologic, thermal, geotechnical,
and geochemical properties of subduction inputs
• Core-log-seismic integration
|
Drilling,
coring, and
downhole
measurement
program:
|
Chikyu Expedition 319 and 322:
Hole A:
• HPCS to refusal and ESCS
• Formation temperature and pressure measurements
Hole B: RCB and wireline logging
• Drill without coring to the refusal depth of Hole A
• Core to basement contact with RCB
• Formation temperature and pressure measurements
• Wireline logging
|
Anticipated
lithology:
|
0–600 mbsf: Shikoku Basin hemipelagic sediments
>600 mbsf: volcaniclastic sediments and basalt
|
