Thermobarometry and electron-microprobe Th-U-Pb monazite dating in garnet metapelites from the Capelinha Formation, Araçuaí Orogen, Brazil.

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Autor(es): dc.creatorQueiroga, Gláucia Nascimento-
Autor(es): dc.creatorSchulz, Bernhard-
Autor(es): dc.creatorMartins, Maximiliano de Souza-
Autor(es): dc.creatorCastro, Marco Paulo de-
Autor(es): dc.creatorSoares, Antônio Carlos Pedrosa-
Autor(es): dc.creatorEvangelista, Hanna Jordt-
Autor(es): dc.creatorSilva, Ana Lúcia da-
Data de aceite: dc.date.accessioned2025-08-21T15:13:44Z-
Data de disponibilização: dc.date.available2025-08-21T15:13:44Z-
Data de envio: dc.date.issued2016-08-01-
Data de envio: dc.date.issued2016-08-01-
Data de envio: dc.date.issued2016-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/6721-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1590/0370-44672015690066-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1007055-
Descrição: dc.descriptionThe Capelinha Formation (Macaúbas Group) consists of a lower quartzitic unit with metamafic intercalations and an upper metapelitic sequence. It occurs in a complex tectono-metamorphic sector of the Araçuaí orogen, where post-collisional collapse-related structures superimposed collisional structures. The garnet-bearing assemblages started crystallization in the collisional deformation stage that formed the main regional foliation around 570 Ma. Garnet porphyroblasts display a well-developed growth zonation of Fe-Mg-Ca-Mn and show, from core to rim, increasing almandine and pyrope contents in contrast with decreasing grossular and spessartine contents. Mineral relations and microstructures provide criteria for local equilibria and a structurally controlled application of geothermobarometers based on cation ex¬change and net transfer reactions. The P-T values calculated from cores to rims of gar¬nets, aligned along clockwise trends, resulted in increasing temperatures (from 500 ºC up to 620 ºC) under decompression conditions (from 8.0 kbar to 4.5 kbar). The Th-U-Pb dating of homogeneous monazites by electron microprobe revealed a recrystalliza¬tion period at around 490 – 480 Ma. These ages can be related to the tectono-thermal event associated with the gravitational collapse, constraining the youngest time limit for metamorphic processes in the Araçuaí orogen.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsaberto-
Direitos: dc.rightsA Revista Escola de Minas - REM - autoriza o depósito de cópia de artigos dos professores e alunos da UFOP no Repositório Institucional da UFOP. Licença concedida mediante preenchimento de formulário online em: 12 set. 2013.-
Palavras-chave: dc.subjectCapelinha formation-
Palavras-chave: dc.subjectGarnet metapelites-
Palavras-chave: dc.subjectGeothermo barometry-
Palavras-chave: dc.subjectElectron microprobe Th U Pb dating-
Título: dc.titleThermobarometry and electron-microprobe Th-U-Pb monazite dating in garnet metapelites from the Capelinha Formation, Araçuaí Orogen, Brazil.-
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