Estudo da evolução da escarpa entre as bacias do Doce/Paraná em Minas Gerais através da quantificação das taxas de desnudação
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Data
2012
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Resumo
Escarpments that presents form of steps in relief and that limit two different basins are
common in eastern of Minas Gerais State in Brazil. This paper investigated the evolution of the escarpment that delimits the Doce catchments (the lower and the eastern portion of the escarpment) from the Paraná catchments (the higher and the western portion of the escarpment) by measurement of the quaternary denudation rates by 10Be cosmogenic nuclide. The results demonstrate that denudation rates measured are closely related to the relief: (i) lower rates in the upper plateau (Paraná catchments); (ii) middle rates on the upper plateau that was captured into the Doce catchments and; (iii) higher rates on the escarpment. It was also possible to understand that the regional relief evolved by double front: the fi rst front is characterized by escarpment backwearing and the second, located further west, by the river captures and downwearing. In this context, it is proved the retraction of the escarpment into the west and, for consequence, the Rio Doce catchments is gaining area at the expense of the Paraná catchments.
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Palavras-chave
Recuo de escarpamento, Escarpment retreat, Evolução do relevo, Captura fluvial, Isótopo cosmogênico 10Be, Relief evolution, 10Be cosmogenic nuclide, Stream capture
Citação
SALGADO, André Augusto Rodrigues et al. Estudo da evolução da escarpa entre as bacias do Doce/Paraná em Minas Gerais através da quantificação das taxas de desnudação. Revista Brasileira de Geomorfologia, Curitiba, v. 13, n. 2, p. 213-222, abr./jun. 2012.