173 Scientific Prospectus


Position: 40°42'N, 11°48'W
Water Depth: 5150 m
Sediment Thickness: 920 m
Total Penetration: 1020 m

Seismic Coverage: Sonne-75 Line 2, CDP730; Line CAM 134

1) Sample acoustic basement high in the OCT between Sites 899 and 900, to characterize the tectonic and magmatic processes that dominate the transition from continental to oceanic crust.
2) Test the prediction that simple shear as a thinning mechanism of the lithosphere led to the exposure of low level continental crust at this point in the OCT.
3) Determine the petrogenetic origin, synrift melting, and metamorphic history of igneous basement.

Drilling Program: Wash down to 100 m above basement and then RCB several tens of meters in basement or to bit destruction.

Logging And Downhole Operations: Triple combo and FMS.

Nature of Rock Anticipated: Nannofossil clay, clay, claystone, siltstone and fine sandstone, ooze, and chalk; mid/lower continental crust or serpentinized peridotite.

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