Geology and lithogeochemistry of migmatites, charnockites and granulites of the Guaxupe Complex, Sao Joao da Boa Vista region, Sao Paulo State, Brazil
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/Z1519-874X2012000300005 http://hdl.handle.net/11449/195800 |
Resumo: | This paper presents new geochemical and petrological data from the southern portion of the Guaxupe 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 820 degrees C 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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Geology and lithogeochemistry of migmatites, charnockites and granulites of the Guaxupe Complex, Sao Joao da Boa Vista region, Sao Paulo State, BrazilGuaxupe Complexgranulitemigmatitecharnockitic gneissThis paper presents new geochemical and petrological data from the southern portion of the Guaxupe 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 820 degrees C 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.Univ Estadual Paulista, UNESP, Inst Geociencias & Ciencias Exatas, Programa Posgrad Geol Reg, Rio Claro, SP, BrazilUniv Estadual Paulista, UNESP, Inst Geociencias & Ciencias Exatas, Dept Petr & Metalogenia, Rio Claro, SP, BrazilUniv Estadual Paulista, UNESP, Inst Geociencias & Ciencias Exatas, Programa Posgrad Geol Reg, Rio Claro, SP, BrazilUniv Estadual Paulista, UNESP, Inst Geociencias & Ciencias Exatas, Dept Petr & Metalogenia, Rio Claro, SP, BrazilSoc Brasileira GeologiaUniversidade Estadual Paulista (Unesp)Melo, Rodrigo Prudente de [UNESP]Farias de Oliveira, Marcos Aurelio [UNESP]2020-12-10T18:03:52Z2020-12-10T18:03:52Z2013-06-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article253-272http://dx.doi.org/10.5327/Z1519-874X2012000300005Brazilian Journal Of Geology. Sao Paulo: Soc Brasileira Geologia, v. 43, n. 2, p. 253-272, 2013.2317-4889http://hdl.handle.net/11449/19580010.5327/Z1519-874X2012000300005WOS:000209433300005Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporBrazilian Journal Of Geologyinfo:eu-repo/semantics/openAccess2021-10-23T10:18:25Zoai:repositorio.unesp.br:11449/195800Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-06T00:10:27.274183Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Geology and lithogeochemistry of migmatites, charnockites and granulites of the Guaxupe Complex, Sao Joao da Boa Vista region, Sao Paulo State, Brazil |
title |
Geology and lithogeochemistry of migmatites, charnockites and granulites of the Guaxupe Complex, Sao Joao da Boa Vista region, Sao Paulo State, Brazil |
spellingShingle |
Geology and lithogeochemistry of migmatites, charnockites and granulites of the Guaxupe Complex, Sao Joao da Boa Vista region, Sao Paulo State, Brazil Melo, Rodrigo Prudente de [UNESP] Guaxupe Complex granulite migmatite charnockitic gneiss |
title_short |
Geology and lithogeochemistry of migmatites, charnockites and granulites of the Guaxupe Complex, Sao Joao da Boa Vista region, Sao Paulo State, Brazil |
title_full |
Geology and lithogeochemistry of migmatites, charnockites and granulites of the Guaxupe Complex, Sao Joao da Boa Vista region, Sao Paulo State, Brazil |
title_fullStr |
Geology and lithogeochemistry of migmatites, charnockites and granulites of the Guaxupe Complex, Sao Joao da Boa Vista region, Sao Paulo State, Brazil |
title_full_unstemmed |
Geology and lithogeochemistry of migmatites, charnockites and granulites of the Guaxupe Complex, Sao Joao da Boa Vista region, Sao Paulo State, Brazil |
title_sort |
Geology and lithogeochemistry of migmatites, charnockites and granulites of the Guaxupe Complex, Sao Joao da Boa Vista region, Sao Paulo State, Brazil |
author |
Melo, Rodrigo Prudente de [UNESP] |
author_facet |
Melo, Rodrigo Prudente de [UNESP] Farias de Oliveira, Marcos Aurelio [UNESP] |
author_role |
author |
author2 |
Farias de Oliveira, Marcos Aurelio [UNESP] |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Melo, Rodrigo Prudente de [UNESP] Farias de Oliveira, Marcos Aurelio [UNESP] |
dc.subject.por.fl_str_mv |
Guaxupe Complex granulite migmatite charnockitic gneiss |
topic |
Guaxupe Complex granulite migmatite charnockitic gneiss |
description |
This paper presents new geochemical and petrological data from the southern portion of the Guaxupe 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 820 degrees C 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 |
2013-06-01 2020-12-10T18:03:52Z 2020-12-10T18:03:52Z |
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/Z1519-874X2012000300005 Brazilian Journal Of Geology. Sao Paulo: Soc Brasileira Geologia, v. 43, n. 2, p. 253-272, 2013. 2317-4889 http://hdl.handle.net/11449/195800 10.5327/Z1519-874X2012000300005 WOS:000209433300005 |
url |
http://dx.doi.org/10.5327/Z1519-874X2012000300005 http://hdl.handle.net/11449/195800 |
identifier_str_mv |
Brazilian Journal Of Geology. Sao Paulo: Soc Brasileira Geologia, v. 43, n. 2, p. 253-272, 2013. 2317-4889 10.5327/Z1519-874X2012000300005 WOS:000209433300005 |
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.publisher.none.fl_str_mv |
Soc Brasileira Geologia |
publisher.none.fl_str_mv |
Soc Brasileira Geologia |
dc.source.none.fl_str_mv |
Web of Science 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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1808129592565694464 |