Phanerozoic cooling history of Archean/Paleoproterozoic basement in the southern Espinhaço Range, southeastern Brazil, through apatite fission-track analysis

Detalhes bibliográficos
Autor(a) principal: Santos, Edgar Amaral
Data de Publicação: 2019
Outros Autores: Jelinek, Andrea Ritter, Abreu, Pedro Angelo Almeida, Genezini, Frederico Antonio
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/220313
Resumo: Apatite fission track thermochronology of basement rocks from the southern Espinhaço Range and QuadriláteroFerrífero in southeastern Brazil unravels the tectonic history of this portion of the Brazilian Shield. The studyarea encompasses an Archean and Paleoproterozoic granitoid-gneiss basement, in the southern border of the SãoFrancisco Craton, and an Archean to Paleo-Mesoproterozoic sedimentary cover. Apatitefission track ages (AFT)vary from 187 ± 18 to 91.8 ± 7.3 Ma and horizontal confined track lengths vary from 9.62 ± 1.81μmto12.85 ± 1.35μm. Thermal history modeling shows an accelerated cooling episode starting in the UpperDevonian to Early Permian. After this event, quiescence lasted from 115 to 170 Ma. Apatite samples lack evi-dence of far-field effects from rifting and opening of the South Atlantic Ocean, and also evidence from alkalineand basaltic magmatism emplacement during Mesozoic-Cenozoic. The AFT thermochronometer remained un-disturbed during Transminas mafic dyke swarm intrusion. Finally, the last cooling event in the Espinhaço Range-Quadrilátero Ferrífero basement records ascension to surface temperatures due to epeirogeny after new con-figurations of the Nazca, South American and African plates. A climatic origin for the ascension is supported byaccentuated erosion rates, even though a weathering-prone phase is registered in weathering profiles.
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spelling Santos, Edgar AmaralJelinek, Andrea RitterAbreu, Pedro Angelo AlmeidaGenezini, Frederico Antonio2021-04-28T04:31:44Z20190895-9811http://hdl.handle.net/10183/220313001124021Apatite fission track thermochronology of basement rocks from the southern Espinhaço Range and QuadriláteroFerrífero in southeastern Brazil unravels the tectonic history of this portion of the Brazilian Shield. The studyarea encompasses an Archean and Paleoproterozoic granitoid-gneiss basement, in the southern border of the SãoFrancisco Craton, and an Archean to Paleo-Mesoproterozoic sedimentary cover. Apatitefission track ages (AFT)vary from 187 ± 18 to 91.8 ± 7.3 Ma and horizontal confined track lengths vary from 9.62 ± 1.81μmto12.85 ± 1.35μm. Thermal history modeling shows an accelerated cooling episode starting in the UpperDevonian to Early Permian. After this event, quiescence lasted from 115 to 170 Ma. Apatite samples lack evi-dence of far-field effects from rifting and opening of the South Atlantic Ocean, and also evidence from alkalineand basaltic magmatism emplacement during Mesozoic-Cenozoic. The AFT thermochronometer remained un-disturbed during Transminas mafic dyke swarm intrusion. Finally, the last cooling event in the Espinhaço Range-Quadrilátero Ferrífero basement records ascension to surface temperatures due to epeirogeny after new con-figurations of the Nazca, South American and African plates. A climatic origin for the ascension is supported byaccentuated erosion rates, even though a weathering-prone phase is registered in weathering profiles.application/pdfengJournal of south american earth sciences. Vol. 96, (Dez. 2019), e102352Quadrilatero ferriferoEspinhaço Range basementApatite fission-track thermochronologyDenudation historyPhanerozoic cooling history of Archean/Paleoproterozoic basement in the southern Espinhaço Range, southeastern Brazil, through apatite fission-track analysisEstrangeiroinfo: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:UFRGSTEXT001124021.pdf.txt001124021.pdf.txtExtracted Texttext/plain0http://www.lume.ufrgs.br/bitstream/10183/220313/2/001124021.pdf.txtd41d8cd98f00b204e9800998ecf8427eMD52ORIGINAL001124021.pdfTexto completo (inglês)application/pdf7038108http://www.lume.ufrgs.br/bitstream/10183/220313/1/001124021.pdf82ac5466108ba26c30466cf4ed07bf84MD5110183/2203132021-05-07 04:43:34.592502oai:www.lume.ufrgs.br:10183/220313Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2021-05-07T07:43:34Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Phanerozoic cooling history of Archean/Paleoproterozoic basement in the southern Espinhaço Range, southeastern Brazil, through apatite fission-track analysis
title Phanerozoic cooling history of Archean/Paleoproterozoic basement in the southern Espinhaço Range, southeastern Brazil, through apatite fission-track analysis
spellingShingle Phanerozoic cooling history of Archean/Paleoproterozoic basement in the southern Espinhaço Range, southeastern Brazil, through apatite fission-track analysis
Santos, Edgar Amaral
Quadrilatero ferrifero
Espinhaço Range basement
Apatite fission-track thermochronology
Denudation history
title_short Phanerozoic cooling history of Archean/Paleoproterozoic basement in the southern Espinhaço Range, southeastern Brazil, through apatite fission-track analysis
title_full Phanerozoic cooling history of Archean/Paleoproterozoic basement in the southern Espinhaço Range, southeastern Brazil, through apatite fission-track analysis
title_fullStr Phanerozoic cooling history of Archean/Paleoproterozoic basement in the southern Espinhaço Range, southeastern Brazil, through apatite fission-track analysis
title_full_unstemmed Phanerozoic cooling history of Archean/Paleoproterozoic basement in the southern Espinhaço Range, southeastern Brazil, through apatite fission-track analysis
title_sort Phanerozoic cooling history of Archean/Paleoproterozoic basement in the southern Espinhaço Range, southeastern Brazil, through apatite fission-track analysis
author Santos, Edgar Amaral
author_facet Santos, Edgar Amaral
Jelinek, Andrea Ritter
Abreu, Pedro Angelo Almeida
Genezini, Frederico Antonio
author_role author
author2 Jelinek, Andrea Ritter
Abreu, Pedro Angelo Almeida
Genezini, Frederico Antonio
author2_role author
author
author
dc.contributor.author.fl_str_mv Santos, Edgar Amaral
Jelinek, Andrea Ritter
Abreu, Pedro Angelo Almeida
Genezini, Frederico Antonio
dc.subject.por.fl_str_mv Quadrilatero ferrifero
topic Quadrilatero ferrifero
Espinhaço Range basement
Apatite fission-track thermochronology
Denudation history
dc.subject.eng.fl_str_mv Espinhaço Range basement
Apatite fission-track thermochronology
Denudation history
description Apatite fission track thermochronology of basement rocks from the southern Espinhaço Range and QuadriláteroFerrífero in southeastern Brazil unravels the tectonic history of this portion of the Brazilian Shield. The studyarea encompasses an Archean and Paleoproterozoic granitoid-gneiss basement, in the southern border of the SãoFrancisco Craton, and an Archean to Paleo-Mesoproterozoic sedimentary cover. Apatitefission track ages (AFT)vary from 187 ± 18 to 91.8 ± 7.3 Ma and horizontal confined track lengths vary from 9.62 ± 1.81μmto12.85 ± 1.35μm. Thermal history modeling shows an accelerated cooling episode starting in the UpperDevonian to Early Permian. After this event, quiescence lasted from 115 to 170 Ma. Apatite samples lack evi-dence of far-field effects from rifting and opening of the South Atlantic Ocean, and also evidence from alkalineand basaltic magmatism emplacement during Mesozoic-Cenozoic. The AFT thermochronometer remained un-disturbed during Transminas mafic dyke swarm intrusion. Finally, the last cooling event in the Espinhaço Range-Quadrilátero Ferrífero basement records ascension to surface temperatures due to epeirogeny after new con-figurations of the Nazca, South American and African plates. A climatic origin for the ascension is supported byaccentuated erosion rates, even though a weathering-prone phase is registered in weathering profiles.
publishDate 2019
dc.date.issued.fl_str_mv 2019
dc.date.accessioned.fl_str_mv 2021-04-28T04:31:44Z
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dc.language.iso.fl_str_mv eng
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dc.relation.ispartof.pt_BR.fl_str_mv Journal of south american earth sciences. Vol. 96, (Dez. 2019), e102352
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