Site: APRIS-04A

Priority: 2 (alternate to APRIS-02A)
65°55.04'S, 77°13.55'W
Water Depth:
3900 m
Sediment Thickness:
>2000 m
Approved Maximum Penetration:
700 mbsf
Seismic Coverage:
Line AI95-136A SP 5550

The objectives of Site APRIS-04A are to:

1. Sample the deeper part of the stratigraphic section not drilled at Site APRIS-03A.

2. Obtain a high-resolution history of Antarctic Peninsula glaciation for the last 6-10 m.y.

3. Determine the onset of drift formation by sampling the base of Unit M4.

Drilling Program:
Double APC until refusal (about 200 m) then XCB. The site is offset by ~110 km from main Site APRIS-03A. Offset required if stratigraphic control seriously degraded below silica diagenetic BSR at ~670 m at main site.

Logging and Downhole Operations:
Standard suites IPLT-DLT and FMS-sonic, plus GHMT.

Nature of Rock Anticipated:
Alternating (interglacial) biosiliceous clay and (glacial) laminated barren gray clay, becoming claystone downhole.

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