IODP

doi:10.14379/iodp.sp.352.2013

Site summaries

Proposed Site BON-1A

Priority: Primary
Position: 28°27.01′N, 142°45.35′E
Water depth (m): 4778
Target drilling depth (mbsf): 1010 (260 m sediment, 750 m basement)
Approved maximum penetration (mbsf): 1510 (pending EPSP approval)
Survey coverage: Line IBr11n CDP 5364, Line KT07
• Track map (Fig. AF1)
• Seismic profiles (Figs. AF2, AF3)
Objective: Characterize lower volcanic stratigraphy at Bonin fore arc to investigate subduction initiation processes and test supra-subduction zone ophiolite models
Drilling, coring, and downhole measurements program: • Hole A: jet-in test
• Hole B: APC/XCB to basement (260 mbsf)
• Hole C: reentry system (16 and 10-3/4 inch casing to 265 mbsf)
• Hole C: drill without recovery to 270 mbsf, RCB from 270 to 1010 mbsf
• FlexIT core orientation measurements
• Wireline logging (triple combo, FMS-sonic)
Nature of rock anticipated: Pelagic carbonate with thin ash layers, basaltic lavas, and sheeted dikes