|
Priority:
|
Primary
|
|
Position:
|
59°31.93′N, 144°8.03′W
|
|
Water depth (mbrf):
|
721
|
|
Target drilling depth (mbsf):
|
400
|
|
Approved maximum penetration (mbsf):
|
417
|
|
Survey coverage:
|
Inline GOA3101 (CDP 398) (navigation and bathymetric maps Figs. AF25, AF28; seismic profiles Figs. AF26, AF27)
|
|
Objective:
|
• Constrain the timing of multiple glacial events of the northern Cordilleran Ice Sheet, to test its relation to global ice sheet dynamics
• Test role of North Pacific surface temperatures control of late Pleistocene
glaciation at sub-century scale
• Document dynamics of productivity and intermediate water circulation in the Northeast Pacific
• Document paleomagnetic intensity and secular variation in NE Pacific to test hypothesis that lowermost mantle heterogeneities influence Earth’s magnetic field
|
|
Drilling and coring program:
|
• Hole A: APC to ~200 mbsf with non-magnetic core barrels and core orientation
• Hole B: APC to ~200 mbsf with non-magnetic core barrels
• Hole C: APC to ~200 mbsf with non-magnetic core barrels
• Hole D: APC/XCB to 400 mbsf
• See “Drilling and coring strategy” and Table T2
|
|
Downhole measurements program:
|
• Hole D: wireline logging with triple combo, FMS-sonic, VSI, and Magnetic Properties tool strings
• See “Downhole measurements strategy” and Table T2
|
|
Anticipated lithology:
|
Hemipelagic mud, glacimarine sediment with diamict
|
