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Site 356, in the southern Brazilian margin, is located on the northern flank of Sào Paulo ridge. This ridge, composed of mafic rocks, is an expression of an east-west trending fracture zone which delineates the southern limit of the Sào Paulo Plateau. Gravity and magnetic anomalies parallel the east-west structural trend of this fracture zone. Piston cores show that whereas on one hand hemipelagic sediments have accumulated in the continental rise to the south, the plateau itself at present receives dominantly pelagic sediments. The southward flowing North Atlantic Deep Water sweeps the main surface of the plateau. On the other hand, the northeastward-flowing Antarctic Bottom Water flows at the base of the plateau and is deflected to the east by the Sào Paulo ridge. On the basis of measured time difference between the deepest reflector drilled at Site 356 and a still deeper feature seen on a nearby profile (here suggested as possibly the igneous basement), we speculate that the drilling terminated 100 meters or so above the basement.

Synthesis of Geological and Geophysical Data in a 1° Square Area around Site 356, Leg 39 DSDP