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https://doi.org/10.5194/se-2018-140
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2018-140
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 13 Feb 2019

Submitted as: research article | 13 Feb 2019

The building, shaping, and filling of an Upper Slope Terrace: the Rio Grande Terrace, SW Atlantic

Michel Michaelovitch de Mahiques1,2, Javier Alcántara-Carrió1, Francisco José Lobo3, Uri Schattner4, Rosangela Felício dos Santos1, Samara Cazzoli y Goya1, Raissa Basti Ramos1, José Gustavo Natorf de Abreu5, Luiz Antonio Pereira de Souza6, Rubens Cesar Lopes Figueira1, and Marcia Caruso Bícego1 Michel Michaelovitch de Mahiques et al.
  • 1Oceanographic Institute, University of São Paulo, São Paulo, 05508-120, Brazil
  • 2Institute of Energy and Environment, University of São Paulo, São Paulo, 05508-010, Brazil
  • 3Instituto Andaluz de Ciencias de la Tierra, Armilla, 18100, Spain
  • 4Leon H Charney School of Marine Sciences, University of Haifa, Haifa, 3498838, Israel
  • 5Escola do Mar, Ciência e Tecnologia, UNIVALI, Itajaí, 88302-901, Brazil
  • 6Instituto de Pesquisas Tecnológicas do Estado de São Paulo, São Paulo, 05508-901, Brazil

Abstract. In this work, we analyze the origin, evolution, and recent sedimentation of the Rio Grande Terrace (RGT), the most prominent upper slope terrace of the SW Atlantic. We gathered data from deep to shallow seismic, echo-sounding and surface sediments in order to recognize the role played by the geological inheritance, the sediment origin, and the present hydrodynamics, this last one defined by the action of the high speeds of the Brazil Current.

The RGT is here interpreted as a unique geomorphological feature, which was developed over a pre-Aptian basement high. It presents a complex modern morphology, given by the erosional action of the Brazil Current and its present surface sediments show a high complexity in terms of origin and grain size.

Michel Michaelovitch de Mahiques et al.
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Michel Michaelovitch de Mahiques et al.
Michel Michaelovitch de Mahiques et al.
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Short summary
This paper is a contribution to the knowledge of the geological processes on the SW Atlantic. We tried to integrate data from different time-scales, such as the geological evolution (millions of years) to the hydrodynamic processes (days to years). The results allowed us to recognize the importance of the geological inheritance to the present morphology of submerged areas.
This paper is a contribution to the knowledge of the geological processes on the SW Atlantic. We...
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