Priority:
|
Primary: Chikyu Expedition 322 (subduction inputs)
|
Position:
|
32°49.73′N, 136°52.89′E
|
Water
depth (m):
|
4062
|
Target
drilling
depth
(mbsf):
|
1200
|
Approved
maximum
penetration
(mbsf):
|
1400; waiting for final approval by EPSP
|
Survey
coverage:
|
Extensive survey data outlined in Proposal 603A-Full2:
• Track map (Fig. AF1)
• Line ODKM03-101 Shotpoint 2524 (Fig. F5)
• IFREE 3-D Line 95 (Fig. F4)
|
Objective
(see text for
full details):
|
Reference site:
• Penetrate entire sedimentary section to oceanic crust
• Complete characterization of Shikoku Basin strata
and upper igneous basement where basement topography
is relatively flat and the lower Shikoku Basin sand facies
is well developed
• Document lithologic, hydrologic, thermal, geotechnical,
and geochemical properties of subduction inputs
• Core-log-seismic integration
|
Drilling,
coring, and
downhole
measurement
program:
|
Chikyu Expedition 322:
Hole A:
• Drill without coring to 400 mbsf
• Core to basement contact with RCB (up to 40 m
into basement as contingency)
• Formation temperature and pressure measurements
• Wireline logging
Contingency:
Hole B: HPCS/ESCS to the start depth of Hole A
|
Anticipated
lithology:
|
0–250 mbsf: upper Shikoku Basin hemipelagics and volcanic ash
250–400 mbsf: lower Shikoku Basin hemipelagics and volcanic ash
400–1200 mbsf: lower Shikoku Basin hemipelagics
and turbidite sands
>1200 mbsf: volcaniclastic sediments and basalt
|
