SITE SUMMARY

Site: JT-3

To 186 Site JT-3 Track Line

To 186 KH96-3 Line 4

Priority: 2
Position: 39°13.44´N, 143°20.66´E
Water Depth: 2490 m
Sediment Thickness: ~1300 m
Target Drilling Depth: 500 m
Approved Maximum Penetration: PPSP approval needed
Seismic Coverage: Near KH96-3 Lines 1 and 4

Objectives: This is an alternate site for JT-1C. The objectives of Site JT-3 are:

1. Volcanic ash stratigraphy during the past 3 m.y.
2. Constrain subsidence history of the Japan Trench forearc.
3. Sedimentology, biostratigraphy, and deformation history of the forearc.

Drilling Program: Double APC, XCB to refusal, RCB.

Logging and Downhole Operations: Triple combo, FMS/sonic/temperature.

Nature of Rock Anticipated: Sandy, silty, pebbly clay with ash layers (50 m); clayey diatom ooze, diatomaceous clay, ash layers (~350 m); diatomaceous claystone, clayey diatomite (~250 m).

To 186 Site JT-4

To 186 Table of Contents