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

dc.contributor.authorQueiroga, Gláucia Nascimento
dc.contributor.authorSchulz, Bernhard
dc.contributor.authorMartins, Maximiliano de Souza
dc.contributor.authorCastro, Marco Paulo de
dc.contributor.authorSoares, Antônio Carlos Pedrosa
dc.contributor.authorEvangelista, Hanna Jordt
dc.contributor.authorSilva, Ana Lúcia da
dc.date.accessioned2016-08-01T19:11:35Z
dc.date.available2016-08-01T19:11:35Z
dc.date.issued2016
dc.description.abstractThe 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.pt_BR
dc.identifier.citationQUEIROGA, G. N. et al. Thermobarometry and electron-microprobe Th-U-Pb monazite dating in garnet metapelites from the Capelinha Formation, Araçuaí Orogen, Brazil. REM. Revista Escola de Minas, v. 69, p. 33-44, 2016. Disponível em: <http://www.scielo.br/pdf/rem/v69n1/0370-4467-rem-69-01-0033.pdf>. Acesso em: 11 jul. 2016.pt_BR
dc.identifier.doihttp://dx.doi.org/10.1590/0370-44672015690066
dc.identifier.issn1807-0353
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/6721
dc.language.isoen_USpt_BR
dc.rightsabertopt_BR
dc.rights.licenseA 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.pt_BR
dc.subjectCapelinha formationpt_BR
dc.subjectGarnet metapelitespt_BR
dc.subjectGeothermo barometrypt_BR
dc.subjectElectron microprobe Th U Pb datingpt_BR
dc.titleThermobarometry and electron-microprobe Th-U-Pb monazite dating in garnet metapelites from the Capelinha Formation, Araçuaí Orogen, Brazil.pt_BR
dc.typeArtigo publicado em periodicopt_BR

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