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Title: Pseudosection modeling and U-Pb geochronology on Piranga schists : role of Brasiliano Orogeny in the Southeastern Quadrilátero Ferrífero, Minas Gerais, Brazil.
Authors: 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
Keywords: São Francisco Craton
Pelitic rocks
U-Pb zircon and monazite geochronology
Lu-Hf isotopes
Issue Date: 2019
Citation: 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: <>. Acesso em: 10 mar. 2020.
Abstract: 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.
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.
Appears in Collections:DEGEO - Artigos publicados em periódicos

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