Petrographic and mineralogical characterization of magmatic-hydrothermal breccia at Itatiaia alkaline complex, Rio de Janeiro state: occurrences of fluorite and REE minerals

Detalhes bibliográficos
Autor(a) principal: Pires, Gustavo Luiz Campos
Data de Publicação: 2014
Outros Autores: Bongiolo, Everton Marques, Neumann, Reiner, Ávila, Ciro Alexandre
Tipo de documento: Artigo
Idioma: por
Título da fonte: Anuário do Instituto de Geociências (Online)
Texto Completo: https://revistas.ufrj.br/index.php/aigeo/article/view/6970
Resumo: The meso-cenozoic alkaline magmatism in Rio de Janeiro is represented by several plutonic/volcanic bodies, which occurred on W-E fracture and lineaments zones associated with the development of the Southeastern Brazilian Rift. One of main occurrences of those rocks is the Itatiaia Alkaline Complex (IAC), which consists of nepheline-syentite, dykes of trachyte/phonolite and magmatic-hydrothermal breccia. This paper shows petrographic and mineralogical caracterization (optical petrography, SEM-EDS and XRD analysis) of breccia. The breccia comprises lithoclasts of trachyte and cristaloclasts of biotite and K-feldspar immersed in microcrystalline groundmass. As hydrothermal mineral it were observed albite, carbonate, sanidine, clinochlore, pyrite (also in lithoclasts), biotite, apatite, fluorite, tourmaline, sericite, synchysite (À parisite), Nb-rutilo, sphalerite, epidote and orthoclase (adularia?). Minerals associated to weathering are gibbsite, melanterita and cancrinite. The new occurrences of fluorcarbonates (synchysite and parisite) and Nb-rutile at the IAC, are rare minerals commonly associated with hydrothermal alteration in alkaline-carbonatite complexes. The hydrothermal paragenesis, as well as comparison with data from other alkaline associations of Rio de Janeiro, suggests that the study rocks consist in late-magmatic/hydrothermal autobreccia, associated to epithermal systems of low sulphidation subtype and generated during interaction with low-temperature alkalic fluids. The description of fluorite and REE-minerals at IAC opens the possibility to find those minerals in other alkaline complex of Rio de Janeiro.
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spelling Petrographic and mineralogical characterization of magmatic-hydrothermal breccia at Itatiaia alkaline complex, Rio de Janeiro state: occurrences of fluorite and REE mineralsCaracterização petrográfica e mineralógica de brechas magmático-hidrotermais no complexo alcalino de Itatiaia, estado do Rio de Janeiro: ocorrências de fluorita e minerais de ETRThe meso-cenozoic alkaline magmatism in Rio de Janeiro is represented by several plutonic/volcanic bodies, which occurred on W-E fracture and lineaments zones associated with the development of the Southeastern Brazilian Rift. One of main occurrences of those rocks is the Itatiaia Alkaline Complex (IAC), which consists of nepheline-syentite, dykes of trachyte/phonolite and magmatic-hydrothermal breccia. This paper shows petrographic and mineralogical caracterization (optical petrography, SEM-EDS and XRD analysis) of breccia. The breccia comprises lithoclasts of trachyte and cristaloclasts of biotite and K-feldspar immersed in microcrystalline groundmass. As hydrothermal mineral it were observed albite, carbonate, sanidine, clinochlore, pyrite (also in lithoclasts), biotite, apatite, fluorite, tourmaline, sericite, synchysite (À parisite), Nb-rutilo, sphalerite, epidote and orthoclase (adularia?). Minerals associated to weathering are gibbsite, melanterita and cancrinite. The new occurrences of fluorcarbonates (synchysite and parisite) and Nb-rutile at the IAC, are rare minerals commonly associated with hydrothermal alteration in alkaline-carbonatite complexes. The hydrothermal paragenesis, as well as comparison with data from other alkaline associations of Rio de Janeiro, suggests that the study rocks consist in late-magmatic/hydrothermal autobreccia, associated to epithermal systems of low sulphidation subtype and generated during interaction with low-temperature alkalic fluids. The description of fluorite and REE-minerals at IAC opens the possibility to find those minerals in other alkaline complex of Rio de Janeiro.O magmatismo alcalino meso-cenozoico no Rio de Janeiro consiste em diversos corpos plutônico-vulcânicos, que ocorrem em zonas de fraturas e lineamentos de direção E-W associados desenvolvimento do Rifte do Sudeste do Brasil. Uma das principais ocorrências dessas rochas é o Complexo Alcalino de Itatiaia (CAI), composto principalmente por nefelina-sienitos, diques de fonolito/traquito e brechas magmático-hidrotermais. Neste trabalho é feita a caracterização petrográfica e mineralógica (petrografia óptica, MEV-EDS, difratometria de raios X) destas brechas. As brechas de Itatiaia são constituídas por litoclastos de traquito e cristaloclastos de K-feldspato e biotita imersos em uma matriz microcristalina. Como minerais hidrotermais foram identificados na matriz albita, carbonato, sanidina, clinocloro, pirita (presente também nos litoclastos), biotita, apatita, fluorita, turmalina, sericita, sinchisita (À parisita), Nb-rutilo, esfalerita, epidoto e ortoclásio (adularia?). Minerais intempéricos são representados por gibbsita, melanterita e cancrinita. Destacam-se as ocorrências inéditas de fluorcarbonatos e Nb-rutilo no CAI, minerais raros associados à alteração hidrotermal em rochas alcalino-carbonatíticas. A paragênese hidrotermal e comparação com dados de outras sequências vulcânicas alcalinas do Rio de Janeiro, sugere-se que as rochas estudadas constituem autobrechas tardi-magmáticas/hidrotermais, relacionadas a sistemas epitermais do tipo baixa sulfetação e geradas a partir da interação com fluidos alcalinos de baixa temperatura. A observação de fluorita e minerais de ETR no CAI abre a possibilidade de ocorrência dos mesmos em outros maciços alcalinos do Rio de Janeiro.Universidade Federal do Rio de Janeiro2014-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://revistas.ufrj.br/index.php/aigeo/article/view/697010.11137/2014_1_05_16Anuário do Instituto de Geociências; Vol 37, No 1 (2014); 5-16Anuário do Instituto de Geociências; Vol 37, No 1 (2014); 5-161982-39080101-9759reponame:Anuário do Instituto de Geociências (Online)instname:Universidade Federal do Rio de Janeiro (UFRJ)instacron:UFRJporhttps://revistas.ufrj.br/index.php/aigeo/article/view/6970/5537Copyright (c) 2014 Anuário do Instituto de Geociênciashttp://creativecommons.org/licenses/by/4.0info:eu-repo/semantics/openAccessPires, Gustavo Luiz CamposBongiolo, Everton MarquesNeumann, ReinerÁvila, Ciro Alexandre2017-01-23T22:42:35Zoai:www.revistas.ufrj.br:article/6970Revistahttps://revistas.ufrj.br/index.php/aigeo/indexPUBhttps://revistas.ufrj.br/index.php/aigeo/oaianuario@igeo.ufrj.br||1982-39080101-9759opendoar:2017-01-23T22:42:35Anuário do Instituto de Geociências (Online) - Universidade Federal do Rio de Janeiro (UFRJ)false
dc.title.none.fl_str_mv Petrographic and mineralogical characterization of magmatic-hydrothermal breccia at Itatiaia alkaline complex, Rio de Janeiro state: occurrences of fluorite and REE minerals
Caracterização petrográfica e mineralógica de brechas magmático-hidrotermais no complexo alcalino de Itatiaia, estado do Rio de Janeiro: ocorrências de fluorita e minerais de ETR
title Petrographic and mineralogical characterization of magmatic-hydrothermal breccia at Itatiaia alkaline complex, Rio de Janeiro state: occurrences of fluorite and REE minerals
spellingShingle Petrographic and mineralogical characterization of magmatic-hydrothermal breccia at Itatiaia alkaline complex, Rio de Janeiro state: occurrences of fluorite and REE minerals
Pires, Gustavo Luiz Campos
title_short Petrographic and mineralogical characterization of magmatic-hydrothermal breccia at Itatiaia alkaline complex, Rio de Janeiro state: occurrences of fluorite and REE minerals
title_full Petrographic and mineralogical characterization of magmatic-hydrothermal breccia at Itatiaia alkaline complex, Rio de Janeiro state: occurrences of fluorite and REE minerals
title_fullStr Petrographic and mineralogical characterization of magmatic-hydrothermal breccia at Itatiaia alkaline complex, Rio de Janeiro state: occurrences of fluorite and REE minerals
title_full_unstemmed Petrographic and mineralogical characterization of magmatic-hydrothermal breccia at Itatiaia alkaline complex, Rio de Janeiro state: occurrences of fluorite and REE minerals
title_sort Petrographic and mineralogical characterization of magmatic-hydrothermal breccia at Itatiaia alkaline complex, Rio de Janeiro state: occurrences of fluorite and REE minerals
author Pires, Gustavo Luiz Campos
author_facet Pires, Gustavo Luiz Campos
Bongiolo, Everton Marques
Neumann, Reiner
Ávila, Ciro Alexandre
author_role author
author2 Bongiolo, Everton Marques
Neumann, Reiner
Ávila, Ciro Alexandre
author2_role author
author
author
dc.contributor.author.fl_str_mv Pires, Gustavo Luiz Campos
Bongiolo, Everton Marques
Neumann, Reiner
Ávila, Ciro Alexandre
description The meso-cenozoic alkaline magmatism in Rio de Janeiro is represented by several plutonic/volcanic bodies, which occurred on W-E fracture and lineaments zones associated with the development of the Southeastern Brazilian Rift. One of main occurrences of those rocks is the Itatiaia Alkaline Complex (IAC), which consists of nepheline-syentite, dykes of trachyte/phonolite and magmatic-hydrothermal breccia. This paper shows petrographic and mineralogical caracterization (optical petrography, SEM-EDS and XRD analysis) of breccia. The breccia comprises lithoclasts of trachyte and cristaloclasts of biotite and K-feldspar immersed in microcrystalline groundmass. As hydrothermal mineral it were observed albite, carbonate, sanidine, clinochlore, pyrite (also in lithoclasts), biotite, apatite, fluorite, tourmaline, sericite, synchysite (À parisite), Nb-rutilo, sphalerite, epidote and orthoclase (adularia?). Minerals associated to weathering are gibbsite, melanterita and cancrinite. The new occurrences of fluorcarbonates (synchysite and parisite) and Nb-rutile at the IAC, are rare minerals commonly associated with hydrothermal alteration in alkaline-carbonatite complexes. The hydrothermal paragenesis, as well as comparison with data from other alkaline associations of Rio de Janeiro, suggests that the study rocks consist in late-magmatic/hydrothermal autobreccia, associated to epithermal systems of low sulphidation subtype and generated during interaction with low-temperature alkalic fluids. The description of fluorite and REE-minerals at IAC opens the possibility to find those minerals in other alkaline complex of Rio de Janeiro.
publishDate 2014
dc.date.none.fl_str_mv 2014-06-01
dc.type.none.fl_str_mv
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://revistas.ufrj.br/index.php/aigeo/article/view/6970
10.11137/2014_1_05_16
url https://revistas.ufrj.br/index.php/aigeo/article/view/6970
identifier_str_mv 10.11137/2014_1_05_16
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://revistas.ufrj.br/index.php/aigeo/article/view/6970/5537
dc.rights.driver.fl_str_mv Copyright (c) 2014 Anuário do Instituto de Geociências
http://creativecommons.org/licenses/by/4.0
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2014 Anuário do Instituto de Geociências
http://creativecommons.org/licenses/by/4.0
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Federal do Rio de Janeiro
publisher.none.fl_str_mv Universidade Federal do Rio de Janeiro
dc.source.none.fl_str_mv Anuário do Instituto de Geociências; Vol 37, No 1 (2014); 5-16
Anuário do Instituto de Geociências; Vol 37, No 1 (2014); 5-16
1982-3908
0101-9759
reponame:Anuário do Instituto de Geociências (Online)
instname:Universidade Federal do Rio de Janeiro (UFRJ)
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instname_str Universidade Federal do Rio de Janeiro (UFRJ)
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reponame_str Anuário do Instituto de Geociências (Online)
collection Anuário do Instituto de Geociências (Online)
repository.name.fl_str_mv Anuário do Instituto de Geociências (Online) - Universidade Federal do Rio de Janeiro (UFRJ)
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