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Título : | Pseudosection modeling and U-Pb geochronology on Piranga schists : role of Brasiliano Orogeny in the Southeastern Quadrilátero Ferrífero, Minas Gerais, Brazil. |
Autor : | Queiroz, Yanne da Silva Queiroga, Gláucia Nascimento Moraes, Renato de Fernandes, Victor Matheus Tavares Medeiros Júnior, Edgar Batista de Evangelista, Hanna Jordt Schulz, Bernhard Schmiedel, Julia Martins, Maximiliano de Souza Castro, Marco Paulo de Lana, Cristiano de Carvalho |
Palabras clave : | São Francisco Craton Pelitic rocks U-Pb zircon and monazite geochronology Lu-Hf isotopes |
Fecha de publicación : | 2019 |
Citación : | QUEIROZ, Y. da S. et al. Pseudosection modeling and U-Pb geochronology on Piranga schists: role of Brasiliano Orogeny in the Southeastern Quadrilátero Ferrífero, Minas Gerais, Brazil. Brazilian Journal of Geology, São Paulo, v. 49, n. 3, p. 1-11, out. 2019. Disponível em: <http://www.scielo.br/scielo.php?pid=S2317-48892019000300306&script=sci_arttext>. Acesso em: 10 mar. 2020. |
Resumen : | In the Southeastern Quadrilátero Ferrífero, a package of metapelitic rocks previously attributed to the Archean Rio das Velhas Supergroup crops out in Piranga locality. This study presents the mineral chemistry and U-Pb-Hf zircon geochronology on foliated staurolite-garnet mica schists. Garnet and staurolite index minerals are syn- to post-kinematic towards the main schistosity. Garnet porphyroblasts display well-developed compositional zoning of Mg-Fe-Mn-Ca, with increase of almandine and pyrope and decrease of spessartine towards the rim, implying in prograde metamorphic pattern. Estimates of P-T values for the metamorphic peak resulted in temperatures between 630 to 650ºC and pressure around 7 kbar. Pseudosections show well-defined stability fields in amphibolite facies, with a metamorphic path displaying progressive increase in P-T conditions. Maximum depositional age of 1,875 ± 51 Ma is established for the Piranga mica schists pointing to a depositional history that is younger than those previously described. Metamorphic Cambrian ages characterize the strong influence of deformational processes related to the final stages of Brasiliano Orogeny in the Southeastern Quadrilátero Ferrífero. |
URI : | http://www.repositorio.ufop.br/handle/123456789/12053 |
metadata.dc.identifier.doi: | https://doi.org/10.1590/2317-4889201920180136 |
ISSN : | 2317-4692 |
metadata.dc.rights.license: | This is an open access article distributed under the terms of the Creative Commons license. Fonte: o próprio artigo. |
Aparece en las colecciones: | DEGEO - Artigos publicados em periódicos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
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ARTIGO_PseudesectionModelingU-PB.pdf | 22,45 MB | Adobe PDF | Visualizar/Abrir |
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