Geologia e litogeoquímica de migmatitos, charnockitos e granulitos do Complexo Guaxupé na região de São João da Boa Vista (SP)
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | |
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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Repositório Institucional da UNESP |
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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 |
|
_version_ |
1808129556559691776 |