Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil

Detalhes bibliográficos
Autor(a) principal: Benites, Susana
Data de Publicação: 2020
Outros Autores: Sommer, Carlos Augusto, Lima, Evandro Fernandes de, Savian, Jairo Francisco, Haag, Maurício Barcelos, Moncinhatto, Thiago Ribas, Trindade, Ricardo Ivan Ferreira da
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/220249
Resumo: The Paraná-Etendeka Magmatic Province is associated with the distensive tectonics that caused the rupture of the Gondwana continent during the Lower Cretaceous and generated an intense volcanism that covers South America and the NW portion of Namibia in Africa. In Brazil, this volcanic sequence is named Serra Geral Group and predominantly consists of basalts and subordinated silicic rocks. The goal of this study is to characterize the geomorphological features observed in the Aparados da Serra region, southern Brazil, and to evaluate the relationship between these structures and the primary silicic volcanic structures. The geomorphological features were fi rst identifi ed using remote sensing and then correlated with fl ow structures observed in the fi eld, as well as petrographic and geochemical data. AMS data were used to determine magnetic patterns and the direction of magmatic fl ow of the rocks. Despite the low degree of anisotropy, clear patterns of lineation and foliation were identifi ed in the studied rocks. Our data shows that Units I and II correspond to silicic lava fl ows linked to effusive fi ssure eruptions, presenting a dome morphology caused by differential erosion. Unit III rocks may correspond to true volcanic domes, whereas the Unit IV corresponds to the effusive feeder structures.
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spelling Benites, SusanaSommer, Carlos AugustoLima, Evandro Fernandes deSavian, Jairo FranciscoHaag, Maurício BarcelosMoncinhatto, Thiago RibasTrindade, Ricardo Ivan Ferreira da2021-04-27T04:33:56Z20200001-3765http://hdl.handle.net/10183/220249001123520The Paraná-Etendeka Magmatic Province is associated with the distensive tectonics that caused the rupture of the Gondwana continent during the Lower Cretaceous and generated an intense volcanism that covers South America and the NW portion of Namibia in Africa. In Brazil, this volcanic sequence is named Serra Geral Group and predominantly consists of basalts and subordinated silicic rocks. The goal of this study is to characterize the geomorphological features observed in the Aparados da Serra region, southern Brazil, and to evaluate the relationship between these structures and the primary silicic volcanic structures. The geomorphological features were fi rst identifi ed using remote sensing and then correlated with fl ow structures observed in the fi eld, as well as petrographic and geochemical data. AMS data were used to determine magnetic patterns and the direction of magmatic fl ow of the rocks. Despite the low degree of anisotropy, clear patterns of lineation and foliation were identifi ed in the studied rocks. Our data shows that Units I and II correspond to silicic lava fl ows linked to effusive fi ssure eruptions, presenting a dome morphology caused by differential erosion. Unit III rocks may correspond to true volcanic domes, whereas the Unit IV corresponds to the effusive feeder structures.application/pdfengAnais da Academia Brasileira de Ciências. Vol. 92, n. 2 (Mar. 2020), e20180981Processamento de imagensSensoriamento remoto : GeologiaAnisotropy of magnetic susceptibilitySilicic lavasVolcanic morphologiesCharacterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern BrazilEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001123520.pdf.txt001123520.pdf.txtExtracted Texttext/plain0http://www.lume.ufrgs.br/bitstream/10183/220249/2/001123520.pdf.txtd41d8cd98f00b204e9800998ecf8427eMD52ORIGINAL001123520.pdfTexto completo (inglês)application/pdf8641295http://www.lume.ufrgs.br/bitstream/10183/220249/1/001123520.pdf12b2b3da259a61f38ccbf81e6ee9dbe9MD5110183/2202492021-11-20 05:54:41.451583oai:www.lume.ufrgs.br:10183/220249Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2021-11-20T07:54:41Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil
title Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil
spellingShingle Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil
Benites, Susana
Processamento de imagens
Sensoriamento remoto : Geologia
Anisotropy of magnetic susceptibility
Silicic lavas
Volcanic morphologies
title_short Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil
title_full Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil
title_fullStr Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil
title_full_unstemmed Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil
title_sort Characterization of volcanic structures associated to the silicic magmatism of the Paraná-Etendeka Province, in the Aparados da Serra region, southern Brazil
author Benites, Susana
author_facet Benites, Susana
Sommer, Carlos Augusto
Lima, Evandro Fernandes de
Savian, Jairo Francisco
Haag, Maurício Barcelos
Moncinhatto, Thiago Ribas
Trindade, Ricardo Ivan Ferreira da
author_role author
author2 Sommer, Carlos Augusto
Lima, Evandro Fernandes de
Savian, Jairo Francisco
Haag, Maurício Barcelos
Moncinhatto, Thiago Ribas
Trindade, Ricardo Ivan Ferreira da
author2_role author
author
author
author
author
author
dc.contributor.author.fl_str_mv Benites, Susana
Sommer, Carlos Augusto
Lima, Evandro Fernandes de
Savian, Jairo Francisco
Haag, Maurício Barcelos
Moncinhatto, Thiago Ribas
Trindade, Ricardo Ivan Ferreira da
dc.subject.por.fl_str_mv Processamento de imagens
Sensoriamento remoto : Geologia
topic Processamento de imagens
Sensoriamento remoto : Geologia
Anisotropy of magnetic susceptibility
Silicic lavas
Volcanic morphologies
dc.subject.eng.fl_str_mv Anisotropy of magnetic susceptibility
Silicic lavas
Volcanic morphologies
description The Paraná-Etendeka Magmatic Province is associated with the distensive tectonics that caused the rupture of the Gondwana continent during the Lower Cretaceous and generated an intense volcanism that covers South America and the NW portion of Namibia in Africa. In Brazil, this volcanic sequence is named Serra Geral Group and predominantly consists of basalts and subordinated silicic rocks. The goal of this study is to characterize the geomorphological features observed in the Aparados da Serra region, southern Brazil, and to evaluate the relationship between these structures and the primary silicic volcanic structures. The geomorphological features were fi rst identifi ed using remote sensing and then correlated with fl ow structures observed in the fi eld, as well as petrographic and geochemical data. AMS data were used to determine magnetic patterns and the direction of magmatic fl ow of the rocks. Despite the low degree of anisotropy, clear patterns of lineation and foliation were identifi ed in the studied rocks. Our data shows that Units I and II correspond to silicic lava fl ows linked to effusive fi ssure eruptions, presenting a dome morphology caused by differential erosion. Unit III rocks may correspond to true volcanic domes, whereas the Unit IV corresponds to the effusive feeder structures.
publishDate 2020
dc.date.issued.fl_str_mv 2020
dc.date.accessioned.fl_str_mv 2021-04-27T04:33:56Z
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dc.relation.ispartof.pt_BR.fl_str_mv Anais da Academia Brasileira de Ciências. Vol. 92, n. 2 (Mar. 2020), e20180981
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