Queiroga, Gláucia NascimentoSchulz, BernhardMartins, Maximiliano de SouzaCastro, Marco Paulo deSoares, Antônio Carlos PedrosaEvangelista, Hanna JordtSilva, Ana Lúcia da2016-08-012016-08-012016QUEIROGA, 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. 2016.1807-0353http://www.repositorio.ufop.br/handle/123456789/6721The 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.en-USabertoCapelinha formationGarnet metapelitesGeothermo barometryElectron microprobe Th U Pb datingArtigo publicado em periodicoA 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.http://dx.doi.org/10.1590/0370-44672015690066