IODP

doi:10.2204/iodp.sp.320321.2008

Site summaries (continued)

Proposed Site PEAT-3D: additional site survey data

PEAT-3 Line 6:
2006 JD 095 00:43:29 UTC, SP 22721
Nearest crossing:
PEAT-3 Line 3 at 2006 JD 094 21:18:15 UTC, SP 21487
Estimated crustal age (Ma):
46
Ship location:
SP 22721: 10°32.772’N, 138°20.183’W
Basement depth (m):
4889 (6.519 s TWT)
Sediment thickness (m):
181 from Site 574 velocity profile (0.229 s TWT)
Velocity (Mayer et al., 1985):
Depth (mbsf)
TWT (ms)
Velocity (m/s)
0–76
0–100
1520
76–151
100–193
1613
151–330
193–410
1650
>330–TD
>410
1970
Site PEAT-3D was chosen as an alternate site, ~2 km north of the cross between Lines 6 and 3 along Line 6. This site has a slightly thinner basal section, although the total sediment column is slightly thicker. Subbottom profiling occasionally reveals indistinct horizons to ~60 m subsurface. However, over most of the area few or no subsurface horizons can be distinguished.