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Campo Dublin Core | Valor | Idioma |
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dc.contributor.author | Queiroga, Gláucia Nascimento | - |
dc.contributor.author | Schulz, Bernhard | - |
dc.contributor.author | Martins, Maximiliano de Souza | - |
dc.contributor.author | Castro, Marco Paulo de | - |
dc.contributor.author | Soares, Antônio Carlos Pedrosa | - |
dc.contributor.author | Evangelista, Hanna Jordt | - |
dc.contributor.author | Silva, Ana Lúcia da | - |
dc.date.accessioned | 2016-08-01T19:11:35Z | - |
dc.date.available | 2016-08-01T19:11:35Z | - |
dc.date.issued | 2016 | - |
dc.identifier.citation | QUEIROGA, 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.issn | 1807-0353 | - |
dc.identifier.uri | http://www.repositorio.ufop.br/handle/123456789/6721 | - |
dc.description.abstract | The 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.language.iso | en_US | pt_BR |
dc.rights | aberto | pt_BR |
dc.subject | Capelinha formation | pt_BR |
dc.subject | Garnet metapelites | pt_BR |
dc.subject | Geothermo barometry | pt_BR |
dc.subject | Electron microprobe Th U Pb dating | pt_BR |
dc.title | Thermobarometry and electron-microprobe Th-U-Pb monazite dating in garnet metapelites from the Capelinha Formation, Araçuaí Orogen, Brazil. | pt_BR |
dc.type | Artigo publicado em periodico | pt_BR |
dc.rights.license | A 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.identifier.doi | http://dx.doi.org/10.1590/0370-44672015690066 | - |
Aparece nas coleções: | DEGEO - Artigos publicados em periódicos |
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ARTIGO_ThermobarometryElectronMicroprobe.pdf | 2,34 MB | Adobe PDF | Visualizar/Abrir |
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