Abstract

STALLIVIERE CORREA, Iran Carlos et al. Sedimentary record of the old Río de La Plata mouth channel in the continental shelf of southern Brazil. Rev. mex. cienc. geol [online]. 2013, vol.30, n.1, pp.51-64. ISSN 2007-2902.

This paper deals with the characterization of the geomorphology and paleo-evolution of a La Plata River paleochannel, located on the south Brazilian continental shelf since the Upper Pleistocene. Through a bathymetric survey and coring of sediments from the paleochannel, a sedimentological and palynological analysis was carried out. This kind of analysis allowed us to characterize a transgressive depositional sequence on the La Plata River paleochannel. The palynological sequences indicated marine environments grading to mixohaline and continental freshwater. From a sedimentological point of view, the area is characterized as a fluvial-estuarine environment. These data offer new information to reconstruct the paleogeographic evolution of the La Plata River paleochannel on the Rio Grande do Sul continental shelf (Brazil).

Keywords : paleodrainage; morphology; continental shelf; La Plata River; Brazil.

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