Pb/Pb single-zircon dating of paleoproterozoic calc-alkaline/alkaline magmatism in the southeastern São Franciso Craton region, Brazil.

Detalhes bibliográficos
Autor(a) principal: Evangelista, Hanna Jordt
Data de Publicação: 2000
Outros Autores: Peres, Guilherme Gravina, Macambira, Moacir Jose Buenano
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFOP
Texto Completo: http://www.repositorio.ufop.br/handle/123456789/3999
Resumo: Two chemically and petrographically distinct intrusive bodies (a calc-alkaline trondhjemite and an alkaline quartz-syenite cut by granitic aplites) occur in the vicinity of Piranga (Minas Gerais State), near the southeastern border of the São Francisco craton, Brazil. They intrude the Rio das Velhas greenstone belt and the Mantiqueira complex, both of Archean age. Both intrusive bodies are variably deformed and mylonitized. Age determinations using the Pb/Pb single-zircon evaporation method yielded Paleoproterozoic ages for the emplacement/crystallization of the trondhjemite (2058 ± lOMa), quartz-syenite (2036 ± 4Ma), as well as the younger aplites (2012 ± 8Ma). These ages allow us to interpret the calc-alkaline as well as the alkaline magmatism as manifestations of the Transamazonian event in the southeastern São Francisco craton region. Furthermore, the calc-alkaline trondhjemite is interpreted to have intruded during compressional deformation, while the alkaline quartz-syenite and its aplitic differentiates are post-orogenic, possibly extension-related. In terms of the Rb vs. (Y +Nb) contents, the trondhjemite plots in the field of volcanic arc granites, whereas the syenite and the aplites plot in the field of post-collision granites. The mylonitic overprinting of the syenite and the trondhjemite is also Paleoproterozoic, as deduced from the 2012 ± 8Ma age of the undeformed younger aplitic dykes which cut the syenite. It is likely that this alkaline magmatism correlates with a Paleoproterozoic post-collisional magmatic event well documented in the Transamazonian mobile belts of the northern São Francisco craton.
id UFOP_ddbe8fa47a96a3fddfe7391913061a7e
oai_identifier_str oai:repositorio.ufop.br:123456789/3999
network_acronym_str UFOP
network_name_str Repositório Institucional da UFOP
repository_id_str 3233
spelling Pb/Pb single-zircon dating of paleoproterozoic calc-alkaline/alkaline magmatism in the southeastern São Franciso Craton region, Brazil.GeochronologyTransamazonianTrondhjemiteQuadrilátero FerríferoSão Francisco cratonTwo chemically and petrographically distinct intrusive bodies (a calc-alkaline trondhjemite and an alkaline quartz-syenite cut by granitic aplites) occur in the vicinity of Piranga (Minas Gerais State), near the southeastern border of the São Francisco craton, Brazil. They intrude the Rio das Velhas greenstone belt and the Mantiqueira complex, both of Archean age. Both intrusive bodies are variably deformed and mylonitized. Age determinations using the Pb/Pb single-zircon evaporation method yielded Paleoproterozoic ages for the emplacement/crystallization of the trondhjemite (2058 ± lOMa), quartz-syenite (2036 ± 4Ma), as well as the younger aplites (2012 ± 8Ma). These ages allow us to interpret the calc-alkaline as well as the alkaline magmatism as manifestations of the Transamazonian event in the southeastern São Francisco craton region. Furthermore, the calc-alkaline trondhjemite is interpreted to have intruded during compressional deformation, while the alkaline quartz-syenite and its aplitic differentiates are post-orogenic, possibly extension-related. In terms of the Rb vs. (Y +Nb) contents, the trondhjemite plots in the field of volcanic arc granites, whereas the syenite and the aplites plot in the field of post-collision granites. The mylonitic overprinting of the syenite and the trondhjemite is also Paleoproterozoic, as deduced from the 2012 ± 8Ma age of the undeformed younger aplitic dykes which cut the syenite. It is likely that this alkaline magmatism correlates with a Paleoproterozoic post-collisional magmatic event well documented in the Transamazonian mobile belts of the northern São Francisco craton.2014-11-20T15:49:00Z2014-11-20T15:49:00Z2000info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfEVANGELISTA, H. J.; PERES, G. G.; MACAMBIRA, M. J. B. Pb/Pb single-zircon dating of paleoproterozoic calc-alkaline/alkaline magmatism in the southeastern São Franciso Craton region, Brazil. Revista Brasileira de Geociências, São Paulo, v. 30, n.1, p. 174-176, 2000. Disponível em: <http://www.ppegeo.igc.usp.br/index.php/rbg/article/view/10969>. Acesso em: 24 set. 2014.2317-4692http://www.repositorio.ufop.br/handle/123456789/3999Os trabalhos publicados na Revista Brasileira de Geociências são de uso gratuito, com atribuições próprias, para aplicações cientifico-educacionais e não-comerciais. Fonte: Revista Brasileira de Geociências <http://www.ppegeo.igc.usp.br/index.php/rbg/about/submissions#copyrightNotice>. Acesso em: 08 mar. 2017.info:eu-repo/semantics/openAccessEvangelista, Hanna JordtPeres, Guilherme GravinaMacambira, Moacir Jose Buenanoengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOP2019-05-13T20:59:17Zoai:repositorio.ufop.br:123456789/3999Repositório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332019-05-13T20:59:17Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false
dc.title.none.fl_str_mv Pb/Pb single-zircon dating of paleoproterozoic calc-alkaline/alkaline magmatism in the southeastern São Franciso Craton region, Brazil.
title Pb/Pb single-zircon dating of paleoproterozoic calc-alkaline/alkaline magmatism in the southeastern São Franciso Craton region, Brazil.
spellingShingle Pb/Pb single-zircon dating of paleoproterozoic calc-alkaline/alkaline magmatism in the southeastern São Franciso Craton region, Brazil.
Evangelista, Hanna Jordt
Geochronology
Transamazonian
Trondhjemite
Quadrilátero Ferrífero
São Francisco craton
title_short Pb/Pb single-zircon dating of paleoproterozoic calc-alkaline/alkaline magmatism in the southeastern São Franciso Craton region, Brazil.
title_full Pb/Pb single-zircon dating of paleoproterozoic calc-alkaline/alkaline magmatism in the southeastern São Franciso Craton region, Brazil.
title_fullStr Pb/Pb single-zircon dating of paleoproterozoic calc-alkaline/alkaline magmatism in the southeastern São Franciso Craton region, Brazil.
title_full_unstemmed Pb/Pb single-zircon dating of paleoproterozoic calc-alkaline/alkaline magmatism in the southeastern São Franciso Craton region, Brazil.
title_sort Pb/Pb single-zircon dating of paleoproterozoic calc-alkaline/alkaline magmatism in the southeastern São Franciso Craton region, Brazil.
author Evangelista, Hanna Jordt
author_facet Evangelista, Hanna Jordt
Peres, Guilherme Gravina
Macambira, Moacir Jose Buenano
author_role author
author2 Peres, Guilherme Gravina
Macambira, Moacir Jose Buenano
author2_role author
author
dc.contributor.author.fl_str_mv Evangelista, Hanna Jordt
Peres, Guilherme Gravina
Macambira, Moacir Jose Buenano
dc.subject.por.fl_str_mv Geochronology
Transamazonian
Trondhjemite
Quadrilátero Ferrífero
São Francisco craton
topic Geochronology
Transamazonian
Trondhjemite
Quadrilátero Ferrífero
São Francisco craton
description Two chemically and petrographically distinct intrusive bodies (a calc-alkaline trondhjemite and an alkaline quartz-syenite cut by granitic aplites) occur in the vicinity of Piranga (Minas Gerais State), near the southeastern border of the São Francisco craton, Brazil. They intrude the Rio das Velhas greenstone belt and the Mantiqueira complex, both of Archean age. Both intrusive bodies are variably deformed and mylonitized. Age determinations using the Pb/Pb single-zircon evaporation method yielded Paleoproterozoic ages for the emplacement/crystallization of the trondhjemite (2058 ± lOMa), quartz-syenite (2036 ± 4Ma), as well as the younger aplites (2012 ± 8Ma). These ages allow us to interpret the calc-alkaline as well as the alkaline magmatism as manifestations of the Transamazonian event in the southeastern São Francisco craton region. Furthermore, the calc-alkaline trondhjemite is interpreted to have intruded during compressional deformation, while the alkaline quartz-syenite and its aplitic differentiates are post-orogenic, possibly extension-related. In terms of the Rb vs. (Y +Nb) contents, the trondhjemite plots in the field of volcanic arc granites, whereas the syenite and the aplites plot in the field of post-collision granites. The mylonitic overprinting of the syenite and the trondhjemite is also Paleoproterozoic, as deduced from the 2012 ± 8Ma age of the undeformed younger aplitic dykes which cut the syenite. It is likely that this alkaline magmatism correlates with a Paleoproterozoic post-collisional magmatic event well documented in the Transamazonian mobile belts of the northern São Francisco craton.
publishDate 2000
dc.date.none.fl_str_mv 2000
2014-11-20T15:49:00Z
2014-11-20T15:49:00Z
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.uri.fl_str_mv EVANGELISTA, H. J.; PERES, G. G.; MACAMBIRA, M. J. B. Pb/Pb single-zircon dating of paleoproterozoic calc-alkaline/alkaline magmatism in the southeastern São Franciso Craton region, Brazil. Revista Brasileira de Geociências, São Paulo, v. 30, n.1, p. 174-176, 2000. Disponível em: <http://www.ppegeo.igc.usp.br/index.php/rbg/article/view/10969>. Acesso em: 24 set. 2014.
2317-4692
http://www.repositorio.ufop.br/handle/123456789/3999
identifier_str_mv EVANGELISTA, H. J.; PERES, G. G.; MACAMBIRA, M. J. B. Pb/Pb single-zircon dating of paleoproterozoic calc-alkaline/alkaline magmatism in the southeastern São Franciso Craton region, Brazil. Revista Brasileira de Geociências, São Paulo, v. 30, n.1, p. 174-176, 2000. Disponível em: <http://www.ppegeo.igc.usp.br/index.php/rbg/article/view/10969>. Acesso em: 24 set. 2014.
2317-4692
url http://www.repositorio.ufop.br/handle/123456789/3999
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFOP
instname:Universidade Federal de Ouro Preto (UFOP)
instacron:UFOP
instname_str Universidade Federal de Ouro Preto (UFOP)
instacron_str UFOP
institution UFOP
reponame_str Repositório Institucional da UFOP
collection Repositório Institucional da UFOP
repository.name.fl_str_mv Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)
repository.mail.fl_str_mv repositorio@ufop.edu.br
_version_ 1813002806210068480