To 186 Site JT-4 Track Line
To 186 KH96-3 Line 4
Position: 39°05.11ŽN, 143°18.77ŽE
Water Depth: 2510 m
Sediment Thickness: ~1300 m
Target Drilling Depth: 1000-1400 m
Approved Maximum Penetration: PPSP approval needed Seismic Coverage: Near intersection of KH96-3 Lines 1 and 4
Objectives: This is an alternate site for JT-1C. The objectives of Site JT-4 are:
Drilling Program: APC to 250 mbsf, XCB to 450 mbsf, and RCB to 1000 mbsf. Drill the instrumented borehole, install reentry cone, and case through unstable section.
Logging and Downhole Operations: Triple combo, FMS/sonic/temperature, BHTV; install long-term sensor package and cement at the bottom.
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); claystone, diatomaceous claystone, calcareous claystone (~200 m); sandy claystone, diatomaceous claystone (~200 m); turbidites and silty claystone (~100 m), sandstone and siltstone (~100 m), boulder to pebble conglomerate and breccia, dacite and mudstone clasts (~50 m); and silicified claystone (~100 m).
To 186 Site 439
To 186 Table of Contents