IODP Expedition 320/321 Scientific Prospectus

doi:10.2204/iodp.sp.320321.2008

Site summaries (continued)


PEAT-5 Line 6:	2006 JD 090 11:07:48 UTC, SP 42593
Nearest crossing:	PEAT-5C Line 1 at 2006 JD 090 03:27:49 UTC, SP 39833 and Line 6 at JD 090 11:36:58 UTC, SP 42768
Estimated crustal age (Ma):	31–32
Ship location:	SP 42593: 7°42.062’N, 128°15.188’W
Basement depth (m):	4564 (6.064 s TWT)
Sediment thickness (m):	252 (estimated) (0.316 s TWT)
Velocity (Mayer et al., 1985):	Depth (mbsf)	Velocity (m/s)
	0–100	1520
	100–193	1613
	193–410	1650
	>410	1970
Site PEAT-5C was chosen on a hill west of the intersection of Lines 6 and 1 because the lower section was better imaged and the basement was distinct and because the additional thickness at the cross of Lines 1 and 6 was primarily caused by Miocene sediment on top and not by the section of primary interest below. Subbottom profiler sections image ~60 m of layered sediments in the upper sediment column.