Long-term evolution of denudational escarpments in southeastern Brazil.
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFOP |
Texto Completo: | http://www.repositorio.ufop.br/handle/123456789/1360 |
Resumo: | Topographic relief in southeastern Brazil consists of a sequence of stepped surfaces that formed after the fragmentation of Gondwana during the Cretaceous, Tertiary and Quaternary tectonic pulses. This region is drained by four major rivers within four major river basins, with interfluves that contain denudational escarpments, fault escarpments and mountain ranges. This study presents an analysis of the long-term evolution of two denudational escarpments, the Cristiano Otoni and the São Geraldo steps, which divide the river basins of the São Francisco, Doce and Paraíba do Sul rivers in southeastern Brazil. Denudation rates were obtained through the measurement of mean concentrations of in situ produced cosmogenic 10Be in sand-sized fluvial quartz sediments collected fromgranitic terrains. The rates were calculated and comparedwith one another and correlated to the basin-scale mean relief, slope, area, and stream power. The mean denudation rates of the Cristiano Otoni and São Geraldo highlands are 8.77 (±2.78)m My−1 and 15.68 (±4.53)m My−1, respectively. The mean denudation rates of the Cristiano Otoni and São Geraldo escarpments are 17.50 (±2.71)m My−1 and 21.22 (±4.24)m My−1, respectively. The denudation rates of the catchments of highlands that drain toward the escarpments are similar to those of their respective highlands. The results demonstrate that relief and slope have similar positive control on the denudation rates for all of the samples despite their different geomorphic context and history of landscape evolution. The São Francisco River Basin is losing area to the Doce River Basin, which, in turn, is losing area to the Paraíba do Sul River Basin. |
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Cherem, Luís Felipe SoaresVarajão, César Augusto ChicarinoBraucher, RégisBourlès, Didier LionelVarajão, Angélica Fortes Drummond ChicarinoSalgado, André Augusto Rodrigues2012-09-06T12:57:55Z2012-09-06T12:57:55Z2012CHEREM, L. F. S. et al. Long-term evolution of denudational escarpments in southeastern Brazil. Geomorphology, p. 1-10, jun. 2012. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0169555X12002735>. Acesso em: 06 set. 2012.0169555Xhttp://www.repositorio.ufop.br/handle/123456789/1360Topographic relief in southeastern Brazil consists of a sequence of stepped surfaces that formed after the fragmentation of Gondwana during the Cretaceous, Tertiary and Quaternary tectonic pulses. This region is drained by four major rivers within four major river basins, with interfluves that contain denudational escarpments, fault escarpments and mountain ranges. This study presents an analysis of the long-term evolution of two denudational escarpments, the Cristiano Otoni and the São Geraldo steps, which divide the river basins of the São Francisco, Doce and Paraíba do Sul rivers in southeastern Brazil. Denudation rates were obtained through the measurement of mean concentrations of in situ produced cosmogenic 10Be in sand-sized fluvial quartz sediments collected fromgranitic terrains. The rates were calculated and comparedwith one another and correlated to the basin-scale mean relief, slope, area, and stream power. The mean denudation rates of the Cristiano Otoni and São Geraldo highlands are 8.77 (±2.78)m My−1 and 15.68 (±4.53)m My−1, respectively. The mean denudation rates of the Cristiano Otoni and São Geraldo escarpments are 17.50 (±2.71)m My−1 and 21.22 (±4.24)m My−1, respectively. The denudation rates of the catchments of highlands that drain toward the escarpments are similar to those of their respective highlands. The results demonstrate that relief and slope have similar positive control on the denudation rates for all of the samples despite their different geomorphic context and history of landscape evolution. The São Francisco River Basin is losing area to the Doce River Basin, which, in turn, is losing area to the Paraíba do Sul River Basin.Cosmogenic nucleidesDenudation rateBrazilEscarpmentLong-term evolution of denudational escarpments in southeastern Brazil.info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleO periódico Geomorphology concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3333721161194.info:eu-repo/semantics/openAccessengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOPORIGINALARTIGO_LongTermEvolution.pdfARTIGO_LongTermEvolution.pdfapplication/pdf2412385http://www.repositorio.ufop.br/bitstream/123456789/1360/1/ARTIGO_LongTermEvolution.pdfc50cb86bf124fcfa752828f87a37ff54MD51123456789/13602019-03-08 10:00:26.653oai:localhost:123456789/1360Repositório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332019-03-08T15:00:26Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false |
dc.title.pt_BR.fl_str_mv |
Long-term evolution of denudational escarpments in southeastern Brazil. |
title |
Long-term evolution of denudational escarpments in southeastern Brazil. |
spellingShingle |
Long-term evolution of denudational escarpments in southeastern Brazil. Cherem, Luís Felipe Soares Cosmogenic nucleides Denudation rate Brazil Escarpment |
title_short |
Long-term evolution of denudational escarpments in southeastern Brazil. |
title_full |
Long-term evolution of denudational escarpments in southeastern Brazil. |
title_fullStr |
Long-term evolution of denudational escarpments in southeastern Brazil. |
title_full_unstemmed |
Long-term evolution of denudational escarpments in southeastern Brazil. |
title_sort |
Long-term evolution of denudational escarpments in southeastern Brazil. |
author |
Cherem, Luís Felipe Soares |
author_facet |
Cherem, Luís Felipe Soares Varajão, César Augusto Chicarino Braucher, Régis Bourlès, Didier Lionel Varajão, Angélica Fortes Drummond Chicarino Salgado, André Augusto Rodrigues |
author_role |
author |
author2 |
Varajão, César Augusto Chicarino Braucher, Régis Bourlès, Didier Lionel Varajão, Angélica Fortes Drummond Chicarino Salgado, André Augusto Rodrigues |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Cherem, Luís Felipe Soares Varajão, César Augusto Chicarino Braucher, Régis Bourlès, Didier Lionel Varajão, Angélica Fortes Drummond Chicarino Salgado, André Augusto Rodrigues |
dc.subject.por.fl_str_mv |
Cosmogenic nucleides Denudation rate Brazil Escarpment |
topic |
Cosmogenic nucleides Denudation rate Brazil Escarpment |
description |
Topographic relief in southeastern Brazil consists of a sequence of stepped surfaces that formed after the fragmentation of Gondwana during the Cretaceous, Tertiary and Quaternary tectonic pulses. This region is drained by four major rivers within four major river basins, with interfluves that contain denudational escarpments, fault escarpments and mountain ranges. This study presents an analysis of the long-term evolution of two denudational escarpments, the Cristiano Otoni and the São Geraldo steps, which divide the river basins of the São Francisco, Doce and Paraíba do Sul rivers in southeastern Brazil. Denudation rates were obtained through the measurement of mean concentrations of in situ produced cosmogenic 10Be in sand-sized fluvial quartz sediments collected fromgranitic terrains. The rates were calculated and comparedwith one another and correlated to the basin-scale mean relief, slope, area, and stream power. The mean denudation rates of the Cristiano Otoni and São Geraldo highlands are 8.77 (±2.78)m My−1 and 15.68 (±4.53)m My−1, respectively. The mean denudation rates of the Cristiano Otoni and São Geraldo escarpments are 17.50 (±2.71)m My−1 and 21.22 (±4.24)m My−1, respectively. The denudation rates of the catchments of highlands that drain toward the escarpments are similar to those of their respective highlands. The results demonstrate that relief and slope have similar positive control on the denudation rates for all of the samples despite their different geomorphic context and history of landscape evolution. The São Francisco River Basin is losing area to the Doce River Basin, which, in turn, is losing area to the Paraíba do Sul River Basin. |
publishDate |
2012 |
dc.date.accessioned.fl_str_mv |
2012-09-06T12:57:55Z |
dc.date.available.fl_str_mv |
2012-09-06T12:57:55Z |
dc.date.issued.fl_str_mv |
2012 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
CHEREM, L. F. S. et al. Long-term evolution of denudational escarpments in southeastern Brazil. Geomorphology, p. 1-10, jun. 2012. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0169555X12002735>. Acesso em: 06 set. 2012. |
dc.identifier.uri.fl_str_mv |
http://www.repositorio.ufop.br/handle/123456789/1360 |
dc.identifier.issn.none.fl_str_mv |
0169555X |
identifier_str_mv |
CHEREM, L. F. S. et al. Long-term evolution of denudational escarpments in southeastern Brazil. Geomorphology, p. 1-10, jun. 2012. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0169555X12002735>. Acesso em: 06 set. 2012. 0169555X |
url |
http://www.repositorio.ufop.br/handle/123456789/1360 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
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info:eu-repo/semantics/openAccess |
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openAccess |
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reponame:Repositório Institucional da UFOP instname:Universidade Federal de Ouro Preto (UFOP) instacron:UFOP |
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http://www.repositorio.ufop.br/bitstream/123456789/1360/1/ARTIGO_LongTermEvolution.pdf |
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Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP) |
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repositorio@ufop.edu.br |
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