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. In this study, we interpret the role played by ocean circulation in sediment distribution on the southwestern Atlantic margin using radiogenic Ndand Pb isotopes. The latitudinal trends for Pb and Nd isotopes reflect the different current systems acting on the margin. The utilization of thesediment fingerprinting method allowed us to associate the isotopic signatures with the main oceanographic features in the area. We recognizeddifferences between Nd and Pb sources to the Argentinean shelf (carried by the flow of Subantarctic Shelf Water) and slopes (transported by deeperflows). Sediments from Antarctica extend up to the Uruguayan margin, carried by the Upper and Lower Circumpolar Deep Water. Our data confirm that,for shelf and intermediate areas (the upper 1200 m), the transfer of sediments from the Argentinean margin to the north of 35∘ S islimited by the Subtropical Shelf Front and the basin-wide recirculated Antarctic Intermediate Water. On the southern Brazilian inner and middle shelf, it is possible to recognize the northward influence of the Río de la Plata sediments carriedby the Plata Plume Water. Another flow responsible for sediment transport and deposition on the outer shelf and slope is the southward flow of theBrazil Current. Finally, we propose that the Brazil–Malvinas Confluence and the Santos Bifurcation act as boundaries of geochemical provinces in thearea. A conceptual model of sediment sources and transport is provided for the southwestern Atlantic margin.

Control of oceanic circulation on sediment distribution in the southwestern Atlantic margin (23 to 55° S)