New data on the eastern Brazil i3asin floor topography

Abstract

Echo-sounding profiles more than 1350 km long have been done within a test area in the eastern part of the Brazil Basin during the 31th cruise of r/v «Dmitry Mendeleev». A morphostructural scheme was compiled basing on the sounding data. A very rough, topography was found at the studied area of the basin floor between the Ascension and Saint Helena transform faults. Large ridges and corresponding valleys appeared to be of longitudinal direction as well as morphostructures of lower order. Sedimentation processes are probably of small importance in the region which accounts for absence of considerable areas of sub-horizontal sea floor.