Multiple processes of geochemical evolution for the alkaline rocks of Rio Bonito intrusive complex, Rio de Janeiro State, Brazil : 40Ar/39Ar and U-Pb ages and Lu-Hf isotopes on zircon and constraints on crustal signature.

Detalhes bibliográficos
Autor(a) principal: Silva, Daniel Adelino da
Data de Publicação: 2020
Outros Autores: Motoki, Akihisa, Santos, Anderson Costa dos, Mendes, Julio, Jourdan, Fred, Geraldes, Mauro César, Lana, Cristiano de Carvalho
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFOP
Texto Completo: http://www.repositorio.ufop.br/handle/123456789/13262
http://dx.doi.org/10.11606/issn.2316-9095.v20-151049
Resumo: This article presents geochemical characteristics of the alkaline rocks of Rio Bonito intrusive complex, State of Rio de Janeiro, Brazil, which is constituted mainly by nepheline syenite. The fractional crystallisation of this magma decreases K2 O/(Na2 O + K2 O) and increases (Na + K)/Al. The TiO2 , Fe2 O3 *, MgO, CaO, and P2 O5 contents indicate fractionation of titanite, ilmenite, and clinopyroxene or amphibole. The total rare earth elements (REEs) are high, and the REE pattern is linear with negative gradient. The nepheline syenite aplite has low REEs, concave REE pattern, and positive Eu anomaly. The ultrabasic and basic mela-nepheline syenite samples have total REEs and light REEs higher than the felsic alkaline rocks. Therefore, the nepheline syenite magma is not derived directly from the alkaline ultrabasic magma. Laser-spot step-heating 40Ar/39Ar ages for biotite and amphibole are 65.03 ± 0.70 and 65.03 ± 0.46. U-Pb ages LA-ICP-MS for two samples are 65.49 ± 0.30 and 65.18 ± 0.30. Values of εHf are negative for both samples, indicating an important crustal component in the evolution of Rio Bonito.
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spelling Multiple processes of geochemical evolution for the alkaline rocks of Rio Bonito intrusive complex, Rio de Janeiro State, Brazil : 40Ar/39Ar and U-Pb ages and Lu-Hf isotopes on zircon and constraints on crustal signature.Múltiplos processos de evolução geoquímica para as rochas alcalinas do complexo intrusivo de Rio Bonito, Estado do Rio de Janeiro, Brasil : idades 40Ar/39Ar e U-Pb e isótopos Lu-Hf em zircão – considerações sobre assinatura crustal.Nepheline syeniteRio BonitoFractional crystallisationCrustal assimilation40Ar/39Ar and U-Pb datingThis article presents geochemical characteristics of the alkaline rocks of Rio Bonito intrusive complex, State of Rio de Janeiro, Brazil, which is constituted mainly by nepheline syenite. The fractional crystallisation of this magma decreases K2 O/(Na2 O + K2 O) and increases (Na + K)/Al. The TiO2 , Fe2 O3 *, MgO, CaO, and P2 O5 contents indicate fractionation of titanite, ilmenite, and clinopyroxene or amphibole. The total rare earth elements (REEs) are high, and the REE pattern is linear with negative gradient. The nepheline syenite aplite has low REEs, concave REE pattern, and positive Eu anomaly. The ultrabasic and basic mela-nepheline syenite samples have total REEs and light REEs higher than the felsic alkaline rocks. Therefore, the nepheline syenite magma is not derived directly from the alkaline ultrabasic magma. Laser-spot step-heating 40Ar/39Ar ages for biotite and amphibole are 65.03 ± 0.70 and 65.03 ± 0.46. U-Pb ages LA-ICP-MS for two samples are 65.49 ± 0.30 and 65.18 ± 0.30. Values of εHf are negative for both samples, indicating an important crustal component in the evolution of Rio Bonito.Este artigo apresenta características geoquímicas das rochas alcalinas do complexo intrusivo de Rio Bonito, estado do Rio de Janeiro, Brasil, que é constituído principalmente por nefelina sienito. A cristalização fracionada desse magma diminui K2 O/(Na2 O + K2 O) e aumenta (Na + K)/Al. Os conteúdos de TiO2 , Fe2 O3 *, MgO, CaO e P2 O5 indicam fracionamento de titanita, ilmenita, clinopiroxênio e anfibólio. O total de terras raras é alto, e o padrão é linear com gradiente negativo. O nefelina sienito aplito tem concentrações de terras raras baixas com padrão côncavo e anomalia positiva de Eu. As amostras de mela-nefelina sienito ultrabásico e básico têm total de terras raras e terras raras leves maiores que as rochas alcalinas félsicas. Portanto, o magma nefelina sienítico não é derivado diretamente do magma alcalino ultrabásico. Idades 40Ar/39Ar step-heating para biotita e anfibólio são 65,03 ± 0,70 e 65,03 ± 0,46. Idades U-Pb LA-ICP-MS de duas amostras são 65,49 ± 0,30 e 65,18 ± 0,30. Os valores de εHf são negativos para ambas as amostras, indicando um importante componente crustal na evolução de Rio Bonito.2021-06-07T19:48:48Z2021-06-07T19:48:48Z2020info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfSILVA, D. A. da. et al. Multiple processes of geochemical evolution for the alkaline rocks of Rio Bonito intrusive complex, Rio de Janeiro State, Brazil: 40Ar/39Ar and U-Pb ages and Lu-Hf isotopes on zircon and constraints on crustal signature. Geologia USP. Série Científica, São Paulo, v. 20, n. 4, p. 221-234, dez. 2020. Disponível em: <http://www.ppegeo.igc.usp.br/index.php/GUSPSC/article/view/13729>. Acesso em: 19 fev. 2021.2316-9095http://www.repositorio.ufop.br/handle/123456789/13262http://dx.doi.org/10.11606/issn.2316-9095.v20-151049O periódico Geologia USP. Série Científica permite que o Repositório Institucional da Universidade Federal de Ouro Preto (UFOP) deposite uma cópia eletrônica dos artigos publicados por esse periódico em que ao menos um dos autores faça parte da comunidade cientifica da UFOP. Fonte: Licença concedida mediante preenchimento de formulário enviado em 20 ago. 2014.info:eu-repo/semantics/openAccessSilva, Daniel Adelino daMotoki, AkihisaSantos, Anderson Costa dosMendes, JulioJourdan, FredGeraldes, Mauro CésarLana, Cristiano de Carvalhoengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOP2021-06-07T19:48:48Zoai:repositorio.ufop.br:123456789/13262Repositório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332021-06-07T19:48:48Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false
dc.title.none.fl_str_mv Multiple processes of geochemical evolution for the alkaline rocks of Rio Bonito intrusive complex, Rio de Janeiro State, Brazil : 40Ar/39Ar and U-Pb ages and Lu-Hf isotopes on zircon and constraints on crustal signature.
Múltiplos processos de evolução geoquímica para as rochas alcalinas do complexo intrusivo de Rio Bonito, Estado do Rio de Janeiro, Brasil : idades 40Ar/39Ar e U-Pb e isótopos Lu-Hf em zircão – considerações sobre assinatura crustal.
title Multiple processes of geochemical evolution for the alkaline rocks of Rio Bonito intrusive complex, Rio de Janeiro State, Brazil : 40Ar/39Ar and U-Pb ages and Lu-Hf isotopes on zircon and constraints on crustal signature.
spellingShingle Multiple processes of geochemical evolution for the alkaline rocks of Rio Bonito intrusive complex, Rio de Janeiro State, Brazil : 40Ar/39Ar and U-Pb ages and Lu-Hf isotopes on zircon and constraints on crustal signature.
Silva, Daniel Adelino da
Nepheline syenite
Rio Bonito
Fractional crystallisation
Crustal assimilation
40Ar/39Ar and U-Pb dating
title_short Multiple processes of geochemical evolution for the alkaline rocks of Rio Bonito intrusive complex, Rio de Janeiro State, Brazil : 40Ar/39Ar and U-Pb ages and Lu-Hf isotopes on zircon and constraints on crustal signature.
title_full Multiple processes of geochemical evolution for the alkaline rocks of Rio Bonito intrusive complex, Rio de Janeiro State, Brazil : 40Ar/39Ar and U-Pb ages and Lu-Hf isotopes on zircon and constraints on crustal signature.
title_fullStr Multiple processes of geochemical evolution for the alkaline rocks of Rio Bonito intrusive complex, Rio de Janeiro State, Brazil : 40Ar/39Ar and U-Pb ages and Lu-Hf isotopes on zircon and constraints on crustal signature.
title_full_unstemmed Multiple processes of geochemical evolution for the alkaline rocks of Rio Bonito intrusive complex, Rio de Janeiro State, Brazil : 40Ar/39Ar and U-Pb ages and Lu-Hf isotopes on zircon and constraints on crustal signature.
title_sort Multiple processes of geochemical evolution for the alkaline rocks of Rio Bonito intrusive complex, Rio de Janeiro State, Brazil : 40Ar/39Ar and U-Pb ages and Lu-Hf isotopes on zircon and constraints on crustal signature.
author Silva, Daniel Adelino da
author_facet Silva, Daniel Adelino da
Motoki, Akihisa
Santos, Anderson Costa dos
Mendes, Julio
Jourdan, Fred
Geraldes, Mauro César
Lana, Cristiano de Carvalho
author_role author
author2 Motoki, Akihisa
Santos, Anderson Costa dos
Mendes, Julio
Jourdan, Fred
Geraldes, Mauro César
Lana, Cristiano de Carvalho
author2_role author
author
author
author
author
author
dc.contributor.author.fl_str_mv Silva, Daniel Adelino da
Motoki, Akihisa
Santos, Anderson Costa dos
Mendes, Julio
Jourdan, Fred
Geraldes, Mauro César
Lana, Cristiano de Carvalho
dc.subject.por.fl_str_mv Nepheline syenite
Rio Bonito
Fractional crystallisation
Crustal assimilation
40Ar/39Ar and U-Pb dating
topic Nepheline syenite
Rio Bonito
Fractional crystallisation
Crustal assimilation
40Ar/39Ar and U-Pb dating
description This article presents geochemical characteristics of the alkaline rocks of Rio Bonito intrusive complex, State of Rio de Janeiro, Brazil, which is constituted mainly by nepheline syenite. The fractional crystallisation of this magma decreases K2 O/(Na2 O + K2 O) and increases (Na + K)/Al. The TiO2 , Fe2 O3 *, MgO, CaO, and P2 O5 contents indicate fractionation of titanite, ilmenite, and clinopyroxene or amphibole. The total rare earth elements (REEs) are high, and the REE pattern is linear with negative gradient. The nepheline syenite aplite has low REEs, concave REE pattern, and positive Eu anomaly. The ultrabasic and basic mela-nepheline syenite samples have total REEs and light REEs higher than the felsic alkaline rocks. Therefore, the nepheline syenite magma is not derived directly from the alkaline ultrabasic magma. Laser-spot step-heating 40Ar/39Ar ages for biotite and amphibole are 65.03 ± 0.70 and 65.03 ± 0.46. U-Pb ages LA-ICP-MS for two samples are 65.49 ± 0.30 and 65.18 ± 0.30. Values of εHf are negative for both samples, indicating an important crustal component in the evolution of Rio Bonito.
publishDate 2020
dc.date.none.fl_str_mv 2020
2021-06-07T19:48:48Z
2021-06-07T19:48:48Z
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 SILVA, D. A. da. et al. Multiple processes of geochemical evolution for the alkaline rocks of Rio Bonito intrusive complex, Rio de Janeiro State, Brazil: 40Ar/39Ar and U-Pb ages and Lu-Hf isotopes on zircon and constraints on crustal signature. Geologia USP. Série Científica, São Paulo, v. 20, n. 4, p. 221-234, dez. 2020. Disponível em: <http://www.ppegeo.igc.usp.br/index.php/GUSPSC/article/view/13729>. Acesso em: 19 fev. 2021.
2316-9095
http://www.repositorio.ufop.br/handle/123456789/13262
http://dx.doi.org/10.11606/issn.2316-9095.v20-151049
identifier_str_mv SILVA, D. A. da. et al. Multiple processes of geochemical evolution for the alkaline rocks of Rio Bonito intrusive complex, Rio de Janeiro State, Brazil: 40Ar/39Ar and U-Pb ages and Lu-Hf isotopes on zircon and constraints on crustal signature. Geologia USP. Série Científica, São Paulo, v. 20, n. 4, p. 221-234, dez. 2020. Disponível em: <http://www.ppegeo.igc.usp.br/index.php/GUSPSC/article/view/13729>. Acesso em: 19 fev. 2021.
2316-9095
url http://www.repositorio.ufop.br/handle/123456789/13262
http://dx.doi.org/10.11606/issn.2316-9095.v20-151049
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
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