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Título: | Denudation rates of the Southern Espinhaço Range, Minas Gerais, Brazil, determined by in situ-produced cosmogenic beryllium-10. |
Autor(es): | Barreto, Helen Nébias Varajão, César Augusto Chicarino Braucher, Régis Bourlès, Didier Lionel Salgado, André Augusto Rodrigues Varajão, Angélica Fortes Drummond Chicarino |
Palavras-chave: | Southern espinhaço range Beryllium Cosmogenic nuclide Denudation rates Brazil |
Data do documento: | 2013 |
Referência: | BARRETO, H. N. et al. Denudation rates of the Southern Espinhaço Range, Minas Gerais, Brazil, determined by in situ-produced cosmogenic beryllium-10. Geomorphology, Amsterdam, v. 191, p. 1-13, 2013. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0169555X13000585>. Acesso em: 18 set. 2014. |
Resumo: | To investigate denudation rates in the southern part of the Espinhaço Range (central-eastern Brazil) and to understand how this important resistant and residual relief has evolved in the past 1.38 My, cosmogenic 10Be concentrations produced in situ were measured in alluvial sediments from the three main regional basins, whose substratum is composed primarily of quartzites. The long-term denudation rates (up to 1.38 My) estimated from these measurements were compared with those that affect the western (São Francisco River) and eastern (Doce and Jequitinhonha Rivers) basins, which face theWest San Francisco craton and the Atlantic, respectively. Denudation rates were measured in 27 samples collected in catchments of different sizes (6–970 km2) and were compared with geomorphic parameters. The mean denudation rates determined in the northern part are low and similar to those determined in the southern part, despite slightly different geomorphic parameter values (catchment relief and mean slope). For the southern catchments, the values are 4.91±1.01 mMy−1 and 3.65±1.26 mMy−1 for the Doce and São Francisco River basins, respectively; for the northern catchments, they are 4.40±1.06 mMy−1 and 3.96±0.91 mMy−1 for the Jequitinhonha and São Francisco River basins, respectively. These low values of denudation rates suggest no direct correlation if plotted against geomorphic parameters such as the catchment area, maximum elevation, catchment relief, average relief and mean slope gradients. These values show that the regional landscape evolves slowly and is strongly controlled by resistant lithology, with similar erosional rates in the three studied basins. |
URI: | http://www.repositorio.ufop.br/handle/123456789/4249 |
DOI: | https://doi.org/10.1016/j.geomorph.2013.01.021 |
ISSN: | 0169-555X |
Licença: | O periódico Geomorphology concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3474900968474. |
Aparece nas coleções: | DEGEO - Artigos publicados em periódicos |
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Arquivo | Descrição | Tamanho | Formato | |
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ARTIGO_DenudationRatesSouthern.pdf | 2,75 MB | Adobe PDF | Visualizar/Abrir |
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