172 Scientific Prospectus


Site: BR-1

Priority: 1
Position: 33°41.2'N, 57°36.9'W
Water Depth: 4450 m
Sediment Thickness: 1000 m
Approved Maximum Penetration: 350 m
Seismic Coverage: IFP line BER1, HU89, KNR 31

Objectives: The objectives of BR-1 are to:

1.Monitor the balance of northern and southern source deep waters over the Bermuda Rise through the past several m.y., and to monitor climate changes in surface waters of the northern Sargasso Sea

2.Provide a high-resolution section for paleomagnetic study

3.Date and identify nature of acoustic transition at ~300 ms

4.Provide a geochemical reference section for pore-water study in a hemipelagic setting that probably has no gas hydrates

Drilling Program:
Triple APC/XCB to 350 m, single APC to 100 m for pore-water geochemistry and high resolution paleoceanography

Logging and Downhole: FMS-sonic and Triple combo, possibly in a dedicated logging hole if time permits.

Nature of Rock Anticipated: Foraminifer-bearing silty clay and nannofossil marl

To Site CS-2
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