Geologia e litogeoquímica de migmatitos, charnockitos e granulitos do Complexo Guaxupé na região de São João da Boa Vista (SP)

Detalhes bibliográficos
Autor(a) principal: De Melo, Rodrigo Prudente [UNESP]
Data de Publicação: 2013
Outros Autores: De Oliveira, Marcos Aurélio Farias [UNESP]
Tipo de documento: Artigo
Idioma: por
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.5327/Z2317-48892013000200005
http://hdl.handle.net/11449/227692
Resumo: This paper presents new geochemical and petrological data from the southern portion of the Guaxupé Complex. The research area is characterized by the occurrence of migmatites and an intrusive body of charnockitic granite located on the northeastern portion of the area. Petrological and geochemical studies of the banded migmatites have shown that the paleossome is generally composed by tholeiitic basaltic orthogranulite showing island arc signature. Partial melting of these basic orthogranulites has formed calc-alkalic neossome of granitic to tonalitic composition with high SiO2 content (> 68.9%) and high (La/Lu)N ratios, as well as low K/Rb ratios. These features are coherent to partial melting of Rb-rich basic protholits at temperatures around 820C producing a felsic melt in presence of orthopyroxene and clinopyroxene. Moreover, a geochemical study of a rocks suite from the charnockitic intrusion has pointed out that its evolution is characterized by magmatic differentiation through crystal fractionation process, which, in turn, has formed a magmatic series starting with porphyritic granite, followed by charnockitic gneiss and leucogneiss as the final product of crystal fractionation. These rocks, located geographically close to the magmatic intrusion, must have been formed by partial melting of granulitic crustal rocks of dioritic composition, represented by banded granulitic gneisses with a geochemical signature similar to the magmatic rocks.
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spelling Geologia e litogeoquímica de migmatitos, charnockitos e granulitos do Complexo Guaxupé na região de São João da Boa Vista (SP)Geology and lithogeochemistry of migmatites, charnockites and granulites of the Guaxupé Complex, São João da Boa Vista region, São Paulo State, BrazilCharnockitic gneissGranuliteGuaxupé ComplexMigmatiteThis paper presents new geochemical and petrological data from the southern portion of the Guaxupé Complex. The research area is characterized by the occurrence of migmatites and an intrusive body of charnockitic granite located on the northeastern portion of the area. Petrological and geochemical studies of the banded migmatites have shown that the paleossome is generally composed by tholeiitic basaltic orthogranulite showing island arc signature. Partial melting of these basic orthogranulites has formed calc-alkalic neossome of granitic to tonalitic composition with high SiO2 content (> 68.9%) and high (La/Lu)N ratios, as well as low K/Rb ratios. These features are coherent to partial melting of Rb-rich basic protholits at temperatures around 820C producing a felsic melt in presence of orthopyroxene and clinopyroxene. Moreover, a geochemical study of a rocks suite from the charnockitic intrusion has pointed out that its evolution is characterized by magmatic differentiation through crystal fractionation process, which, in turn, has formed a magmatic series starting with porphyritic granite, followed by charnockitic gneiss and leucogneiss as the final product of crystal fractionation. These rocks, located geographically close to the magmatic intrusion, must have been formed by partial melting of granulitic crustal rocks of dioritic composition, represented by banded granulitic gneisses with a geochemical signature similar to the magmatic rocks.Programa de Pós-Graduação em Geologia Regional, Instituto de Geociências e Ciências Exatas, Universidade Estadual Paulista Júlio de Mesquita Filho, Rio-Claro (SP)Departamento de Petrologia e Metalogenia, Instituto de Geociências e Ciências Exatas, Universidade Estadual Paulista Júlio de Mesquita Filho, Rio-Claro SPPrograma de Pós-Graduação em Geologia Regional, Instituto de Geociências e Ciências Exatas, Universidade Estadual Paulista Júlio de Mesquita Filho, Rio-Claro (SP)Departamento de Petrologia e Metalogenia, Instituto de Geociências e Ciências Exatas, Universidade Estadual Paulista Júlio de Mesquita Filho, Rio-Claro SPUniversidade Estadual Paulista (UNESP)De Melo, Rodrigo Prudente [UNESP]De Oliveira, Marcos Aurélio Farias [UNESP]2022-04-29T07:14:32Z2022-04-29T07:14:32Z2013-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article253-272http://dx.doi.org/10.5327/Z2317-48892013000200005Brazilian Journal of Geology, v. 43, n. 2, p. 253-272, 2013.2317-46922317-4889http://hdl.handle.net/11449/22769210.5327/Z2317-488920130002000052-s2.0-84898435776Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporBrazilian Journal of Geologyinfo:eu-repo/semantics/openAccess2022-04-29T07:14:32Zoai:repositorio.unesp.br:11449/227692Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T23:49:29.222318Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Geologia e litogeoquímica de migmatitos, charnockitos e granulitos do Complexo Guaxupé na região de São João da Boa Vista (SP)
Geology and lithogeochemistry of migmatites, charnockites and granulites of the Guaxupé Complex, São João da Boa Vista region, São Paulo State, Brazil
title Geologia e litogeoquímica de migmatitos, charnockitos e granulitos do Complexo Guaxupé na região de São João da Boa Vista (SP)
spellingShingle Geologia e litogeoquímica de migmatitos, charnockitos e granulitos do Complexo Guaxupé na região de São João da Boa Vista (SP)
De Melo, Rodrigo Prudente [UNESP]
Charnockitic gneiss
Granulite
Guaxupé Complex
Migmatite
title_short Geologia e litogeoquímica de migmatitos, charnockitos e granulitos do Complexo Guaxupé na região de São João da Boa Vista (SP)
title_full Geologia e litogeoquímica de migmatitos, charnockitos e granulitos do Complexo Guaxupé na região de São João da Boa Vista (SP)
title_fullStr Geologia e litogeoquímica de migmatitos, charnockitos e granulitos do Complexo Guaxupé na região de São João da Boa Vista (SP)
title_full_unstemmed Geologia e litogeoquímica de migmatitos, charnockitos e granulitos do Complexo Guaxupé na região de São João da Boa Vista (SP)
title_sort Geologia e litogeoquímica de migmatitos, charnockitos e granulitos do Complexo Guaxupé na região de São João da Boa Vista (SP)
author De Melo, Rodrigo Prudente [UNESP]
author_facet De Melo, Rodrigo Prudente [UNESP]
De Oliveira, Marcos Aurélio Farias [UNESP]
author_role author
author2 De Oliveira, Marcos Aurélio Farias [UNESP]
author2_role author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (UNESP)
dc.contributor.author.fl_str_mv De Melo, Rodrigo Prudente [UNESP]
De Oliveira, Marcos Aurélio Farias [UNESP]
dc.subject.por.fl_str_mv Charnockitic gneiss
Granulite
Guaxupé Complex
Migmatite
topic Charnockitic gneiss
Granulite
Guaxupé Complex
Migmatite
description This paper presents new geochemical and petrological data from the southern portion of the Guaxupé Complex. The research area is characterized by the occurrence of migmatites and an intrusive body of charnockitic granite located on the northeastern portion of the area. Petrological and geochemical studies of the banded migmatites have shown that the paleossome is generally composed by tholeiitic basaltic orthogranulite showing island arc signature. Partial melting of these basic orthogranulites has formed calc-alkalic neossome of granitic to tonalitic composition with high SiO2 content (> 68.9%) and high (La/Lu)N ratios, as well as low K/Rb ratios. These features are coherent to partial melting of Rb-rich basic protholits at temperatures around 820C producing a felsic melt in presence of orthopyroxene and clinopyroxene. Moreover, a geochemical study of a rocks suite from the charnockitic intrusion has pointed out that its evolution is characterized by magmatic differentiation through crystal fractionation process, which, in turn, has formed a magmatic series starting with porphyritic granite, followed by charnockitic gneiss and leucogneiss as the final product of crystal fractionation. These rocks, located geographically close to the magmatic intrusion, must have been formed by partial melting of granulitic crustal rocks of dioritic composition, represented by banded granulitic gneisses with a geochemical signature similar to the magmatic rocks.
publishDate 2013
dc.date.none.fl_str_mv 2013-01-01
2022-04-29T07:14:32Z
2022-04-29T07:14:32Z
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 http://dx.doi.org/10.5327/Z2317-48892013000200005
Brazilian Journal of Geology, v. 43, n. 2, p. 253-272, 2013.
2317-4692
2317-4889
http://hdl.handle.net/11449/227692
10.5327/Z2317-48892013000200005
2-s2.0-84898435776
url http://dx.doi.org/10.5327/Z2317-48892013000200005
http://hdl.handle.net/11449/227692
identifier_str_mv Brazilian Journal of Geology, v. 43, n. 2, p. 253-272, 2013.
2317-4692
2317-4889
10.5327/Z2317-48892013000200005
2-s2.0-84898435776
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv Brazilian Journal of Geology
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 253-272
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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