Priority:
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Primary
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Position:
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54°02.0′N, 179°00.5′E (WGS 84)
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Water depth (m)
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2166
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Target drilling depth (mbsf):
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555
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Approved maximum penetration (mbsf):
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600
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Previous drilling in area:
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DSDP Site 188
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Comments:
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Relocated from Site BOW-14A to Shotpoint 670 on Line Stk5-1 during Cruise KH99-3, 1999. Approved depth of penetration was reduced to 600 mbsf because of concerns about penetrating the strong amplitude event near the original proposed depth of penetration (EPSP December 2005).
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Survey coverage (track map, seismic profile); sediment cores:
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R/V Hakuhou-maru Cruise KH99-3 Leg 3 (1999):
• Track map (Figs. AF9, AF10)
• Swath bathymetry: Line Stk5-1 (W–E) and Stk5-5 (S–N) (Fig. AF11)
• Subbottom profile, 3.5 kHz: Line Stk5-1 (W–E), Line Stk5-5 (S–N), (Fig. AF12)
• MCS profile: Line Stk5-1 (W–E) (Figs. AF13, AF14)
• Crossing Line Stk5-5 (S–N), Shotpoint 2488 (Figs. AF15, AF16)
• Multiple cores (30 m)
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Objective (see text for complete details):
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Provide high-resolution records from the deepest part of vertical depth transect in the south Bering Sea; will be used to evaluate vertical water mass gradients when compared to other sites.
Monitor exchange of North Pacific and Bering Sea water from the upper Miocene through the Pleistocene.
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Drilling/coring program:
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Triple APC to refusal, and XCB to 555 mbsf:
• Holes A, B, and C: APC with core orientation to refusal (~200 mbsf)
• Hole C: XCB to ~555 mbsf; logging
Temperature measurements: 3 APCT-3, 2 DVTP if required
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Downhole logging program:
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Wireline logging: triple combo, FMS-sonic
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Anticipated lithology:
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Hemipelagic silty clay with siliceous microfossils
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