Characterization and genesis of waterfalls of the Presidente Figueiredo region, Northeast State of Amazonas, Brazil

Detalhes bibliográficos
Autor(a) principal: NOGUEIRA,AFONSO C. R.
Data de Publicação: 2001
Outros Autores: SARGES,ROSEANE R.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Anais da Academia Brasileira de Ciências (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200012
Resumo: The waterfalls of the Presidente Figueiredo municipality represent a fascinating natural scenery of northeast state of Amazonas, northern Brazil. The falls, generally less than 10m high, are developed on siliciclastic rocks of the Nhamundá (Lower Silurian), and Manacapuru (Upper Silurian - Lower Devonian) formations. Morphological and structural analyses of these features indicate that most of them originated through Quaternary neotectonics and are installed in NE-trending normal fault escarpments. Waterfalls also developed within pseudokarstic features, but are less frequent. The origin of the Presidente Figueiredo waterfalls probably goes back to the Neogene, when the region was submitted to laterization processes associated with a humid climate and a dense rainforest. These conditions favored the development of caves in quartzarenites of the Nhamundá Formation. During the Quaternary, the region was subjected to NE-trending normal faulting which displaced laterite layers, rivers and streams giving rise to waterfalls. These climatic and tectonic phenomena promoted intense relief dissection, as indicated by fault escarpment retreat and cave dismantlement, responsible for the present-day morphologic configuration.
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spelling Characterization and genesis of waterfalls of the Presidente Figueiredo region, Northeast State of Amazonas, BrazilwaterfallsWestern AmazonQuaternary tectonicspseudokarstThe waterfalls of the Presidente Figueiredo municipality represent a fascinating natural scenery of northeast state of Amazonas, northern Brazil. The falls, generally less than 10m high, are developed on siliciclastic rocks of the Nhamundá (Lower Silurian), and Manacapuru (Upper Silurian - Lower Devonian) formations. Morphological and structural analyses of these features indicate that most of them originated through Quaternary neotectonics and are installed in NE-trending normal fault escarpments. Waterfalls also developed within pseudokarstic features, but are less frequent. The origin of the Presidente Figueiredo waterfalls probably goes back to the Neogene, when the region was submitted to laterization processes associated with a humid climate and a dense rainforest. These conditions favored the development of caves in quartzarenites of the Nhamundá Formation. During the Quaternary, the region was subjected to NE-trending normal faulting which displaced laterite layers, rivers and streams giving rise to waterfalls. These climatic and tectonic phenomena promoted intense relief dissection, as indicated by fault escarpment retreat and cave dismantlement, responsible for the present-day morphologic configuration.Academia Brasileira de Ciências2001-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200012Anais da Academia Brasileira de Ciências v.73 n.2 2001reponame:Anais da Academia Brasileira de Ciências (Online)instname:Academia Brasileira de Ciências (ABC)instacron:ABC10.1590/S0001-37652001000200012info:eu-repo/semantics/openAccessNOGUEIRA,AFONSO C. R.SARGES,ROSEANE R.eng2001-06-08T00:00:00Zoai:scielo:S0001-37652001000200012Revistahttp://www.scielo.br/aabchttps://old.scielo.br/oai/scielo-oai.php||aabc@abc.org.br1678-26900001-3765opendoar:2001-06-08T00:00Anais da Academia Brasileira de Ciências (Online) - Academia Brasileira de Ciências (ABC)false
dc.title.none.fl_str_mv Characterization and genesis of waterfalls of the Presidente Figueiredo region, Northeast State of Amazonas, Brazil
title Characterization and genesis of waterfalls of the Presidente Figueiredo region, Northeast State of Amazonas, Brazil
spellingShingle Characterization and genesis of waterfalls of the Presidente Figueiredo region, Northeast State of Amazonas, Brazil
NOGUEIRA,AFONSO C. R.
waterfalls
Western Amazon
Quaternary tectonics
pseudokarst
title_short Characterization and genesis of waterfalls of the Presidente Figueiredo region, Northeast State of Amazonas, Brazil
title_full Characterization and genesis of waterfalls of the Presidente Figueiredo region, Northeast State of Amazonas, Brazil
title_fullStr Characterization and genesis of waterfalls of the Presidente Figueiredo region, Northeast State of Amazonas, Brazil
title_full_unstemmed Characterization and genesis of waterfalls of the Presidente Figueiredo region, Northeast State of Amazonas, Brazil
title_sort Characterization and genesis of waterfalls of the Presidente Figueiredo region, Northeast State of Amazonas, Brazil
author NOGUEIRA,AFONSO C. R.
author_facet NOGUEIRA,AFONSO C. R.
SARGES,ROSEANE R.
author_role author
author2 SARGES,ROSEANE R.
author2_role author
dc.contributor.author.fl_str_mv NOGUEIRA,AFONSO C. R.
SARGES,ROSEANE R.
dc.subject.por.fl_str_mv waterfalls
Western Amazon
Quaternary tectonics
pseudokarst
topic waterfalls
Western Amazon
Quaternary tectonics
pseudokarst
description The waterfalls of the Presidente Figueiredo municipality represent a fascinating natural scenery of northeast state of Amazonas, northern Brazil. The falls, generally less than 10m high, are developed on siliciclastic rocks of the Nhamundá (Lower Silurian), and Manacapuru (Upper Silurian - Lower Devonian) formations. Morphological and structural analyses of these features indicate that most of them originated through Quaternary neotectonics and are installed in NE-trending normal fault escarpments. Waterfalls also developed within pseudokarstic features, but are less frequent. The origin of the Presidente Figueiredo waterfalls probably goes back to the Neogene, when the region was submitted to laterization processes associated with a humid climate and a dense rainforest. These conditions favored the development of caves in quartzarenites of the Nhamundá Formation. During the Quaternary, the region was subjected to NE-trending normal faulting which displaced laterite layers, rivers and streams giving rise to waterfalls. These climatic and tectonic phenomena promoted intense relief dissection, as indicated by fault escarpment retreat and cave dismantlement, responsible for the present-day morphologic configuration.
publishDate 2001
dc.date.none.fl_str_mv 2001-06-01
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dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200012
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dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0001-37652001000200012
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dc.publisher.none.fl_str_mv Academia Brasileira de Ciências
publisher.none.fl_str_mv Academia Brasileira de Ciências
dc.source.none.fl_str_mv Anais da Academia Brasileira de Ciências v.73 n.2 2001
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