LEG 177 SITE SUMMARIES

Site: TSO-6A

Priority: 1
Position: 49°58.58´S, 5°51.92´E
Water Depth: 3680 m
Sediment Thickness: 1100 m
Approved Maximum Penetration: 700 m
Seismic Coverage: AWI94090, shot point PS916


Objectives: Recover a 700-m sequence at moderate to high sedimentation rates to study
1. surface-water parameters, sea-ice distribution, and the evolution of the Polar Front (thermal isolation of Southern Ocean);
2. paleoproductivity changes (e.g., silica, carbon export rates) and the history of the circum Antarctic biogenic silica belt in relation to surface-water-mass changes, deep-water circulation, and sea-ice distribution;
3. deep-water circulation including changes in the physical and chemical properties of CPDW;
4. the response to orbital forcing and the phase relationships of proxy records to climatic records in low and northern high latitudes; and
5. silica diagenesis.

Drilling Program: Triple APC to 200 m, XCB to 400 m, RCB to 700 m


Logging and Downhole: Triple Combo, GHMT, and FMS logs


Nature of Rock Anticipated: Foram-bearing diatom ooze, calcareous diatom ooze, diatomaceous nannofossil chalk, limestone


Site: TSO-6B

Priority: 2
Position: 50°0.98´S, 5°50.13´E
Water Depth: 3679 m
Sediment Thickness: 1100 m
Approved Maximum Penetration: 700 m
Seismic Coverage: TN057/TSO6, shot point TN650
Objectives: Same as TSO-6A.

Drilling Program: Triple APC to 200 m, XCB to 400 m, RCB to 700 m


Logging and Downhole: Triple Combo, GLT, GHMT, and FMS logs


Nature of Rock Anticipated: Foram-bearing diatom ooze, calcareous diatom ooze, diatomaceous nannofossil chalk, limestone

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