IODP Expedition 323 Scientific Prospectus

doi:10.2204/iodp.sp.323.2009

Site summaries (continued)


Priority:	Primary
Position:	54°40.2′N, 169°58.9′W (WGS 84)
Water depth (m)	1900
Target drilling depth (mbsf):	200
Approved maximum penetration (mbsf):	200
Previous drilling in area:	DSDP Site 185
Comments:	Relocated from Site UMK-4C to Shotpoint 3275 on Line 2 of USGS R/V Lee Cruise L6-80 (EPSP December 2005)
Survey coverage (track map, seismic profile); sediment cores:	USGS R/V Lee Cruise L6-80 (1980): • Single-channel seismic: Line 2 (Figs. AF52, AF53) • Crossing Line 5 (Figs. AF54, AF55) • Seismic velocity: DSDP Site 185 measurement; ref. interval velocity by R/V Lee Cruise L6-80, Line 6 R/V Hakuhou-maru Cruise KH99-3 Leg 3 (1999): • Regional overview map with track line (Fig. AF55) • 3.5 kHz (Fig. AF56) • Swath bathymetry (Fig. AF57) • Multiple cores (30 cm)
Objective (see text for complete details):	Monitor surface water exchange from the Pacific into the Bering Sea and surface conditions in the easternmost part of the Bering Sea. Reconstruct Pliocene–Pleistocene high-resolution paleoceanography and investigate Bering/Arctic Gateway history and sea ice and water mass distribution, distal to Pacific water.
Drilling/coring program:	Holes A, B, and D: APC with core orientation to ~200 m, Hole C to 25 mbsf Temperature measurements: 3 APCT-3
Downhole logging program:	Wireline logging: triple combo, FMS-sonic
Anticipated lithology:	Hemipelagic silty clay with siliceous and calcareous microfossils. Estimated bottom age = Pliocene.