IODP Expedition 323 Scientific Prospectus

doi:10.2204/iodp.sp.323.2009

Site summaries (continued)


Priority:	Alternate
Position:	60°09.19′N, 179°28.20′W
Water depth (m)	1130
Target drilling depth (mbsf):	150
Approved maximum penetration (mbsf):	150
Previous drilling in area:	Piston core Healy 02-02-3JPC
Comments:	Relocated from NAV-1A because of an unconformity observed in the seismic profile of Discoverer 4-80-BS Line 18 If time is available, coring NAV-1B will provide very high resolution Pleistocene records that could be compared to the Santa Barbara and Cariaco basins and the GISP2 records.
Survey coverage (track map, seismic profile); sediment cores:	• Track map (Fig. AF60) • Seismic profiles: CDP1139 on Farnella-2-86 BS Line 4A (Fig. AF61); 1550Z on Discoverer 4-80 BS Line 18 (Fig. AF62) • Minisparker (Fig. AF63)
Objective (see text for complete details):	Reconstruct high-resolution history of climate of the subarctic Pacific during the late Pleistocene. Study history of North Pacific Intermediate Water formation at submillennial timescales. Investigate oceanic and atmospheric linkage between subarctic Pacific and the rest of the globe during millennial-scale and rapid climate events.
Drilling/coring program:	Quadruple APC (Holes A, B, C, and D) with core orientation to 150 mbsf, Hole E to 25 mbsf
Downhole logging program:	NA
Anticipated lithology:	Hemipelagic silty clay with calcareous and siliceous microfossils