Priority: 1
Position: 63°56.52'S, 65°34.62'W
Water Depth: 490 m
Sediment Thickness: >2000 m
Approved Maximum Penetration: 1050 mbsf
Seismic Coverage: Explora Line AI95-152 and Discovery Line AMG845-08
Objectives: The objectives of Site APSHE-04A are to:
1. Identify and date the main changes in wedge geometry during progradation of the glacial
wedge including the "pre-glacial"/glacial transition (conformable boundary between the
oldest part of S2 and the youngest "pre-glacial" S3).
2. Examine topset (S1 and S2) and"pre-glacial" (S3) lithologies and compare with rise drift.
Drilling Program: Single RCB hole to 785 m.
Logging and Downhole Operations: Standard suites IPLT-DLT and FMS-sonic, plus GHMT.
Nature of Rock Anticipated: Diamicton (alternations of lodgement till in topsets and proximal
glacial marine) with thin biosiliceous interbeds to base of S2, then uncertain lithology (glacial
marine diamicton or biosiliceous hemipelagic).
Note: seismic line same as Site APSHE-01A
