Petrologic and geochronological constraints on the polymetamorphic evolution of the collisional granites, Araçuaí Orogen (SE Brazil).

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dc.contributor.authorFerreira, Sandro Lúcio Mauri
dc.contributor.authorMelo, Marilane Gonzaga de
dc.contributor.authorLana, Cristiano de Carvalho
dc.contributor.authorMarques, Rodson de Abreu
dc.date.accessioned2022-09-14T20:56:47Z
dc.date.available2022-09-14T20:56:47Z
dc.date.issued2021pt_BR
dc.description.abstractCollisional granites of the Araçuaí Orogen, southeastern Brazil, record petrological and geochronological evidence for multiple crustal melting during the orogeny evolution. U-Pb zircon data indicate that these granites crystallized at 586 ± 2 M.y. High-grade metamorphism (M1 ) involved partial melting by fl uid-absent reactions that produced the fi rst generation of garnet in temperatures of approx. 750°C. Preservation of the mineral assemblage A1 (garnet-biotite-plagioclase-K-feldspar-quartz-ilmenite-melt) indicates that most of the generated melt was lost from these rocks at or near peak metamorphic conditions. A second metamorphic event (M2 ) is characterized by growth of a second generation of garnet in preserved A2 assemblage (garnet-sillimanite-biotite- plagioclase-K-feldspar-quartz-ilmenite-melt). Mineral equilibria modeling constrains conditions of M2 metamorphism to 713-729 °C and 6.2-7.3 kbar. Retrograde assemblage (A3 ) records equilibrium conditions at 610-660 °C. The Hf isotope composition indicates signifi cant crustal contribution to the genesis of the collisional granites. The elevated geotherms in thickened crust provide enough heat for the M1 event at 562 ± 2 M.y. Subsequent heating probably associated to the transfer of mantle heat to the crust during the extensional thinning and gravitational collapse of the orogen lead to the M2 event at 526 ± 4 M.y. This event is concomitant to the emplacement of the post- collisional magmas in the orogen.pt_BR
dc.identifier.citationFERREIRA, S. L. M. et al. Petrologic and geochronological constraints on the polymetamorphic evolution of the collisional granites, Araçuaí Orogen (SE Brazil). Anais da Academia Brasileira de Ciências, v. 93, 2021. Disponível em: <http://old.scielo.br/scielo.php?pid=S0001-37652021000501104&script=sci_abstract>. Acesso em: 29 abr. 2022.pt_BR
dc.identifier.doihttps://doi.org/10.1590/0001-3765202120200639.pt_BR
dc.identifier.issn1678-2690
dc.identifier.urihttp://www.repositorio.ufop.br/jspui/handle/123456789/15282
dc.language.isoen_USpt_BR
dc.rightsabertopt_BR
dc.rights.licenseThis is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY). Fonte: o PDF do artigo.pt_BR
dc.subjectPartial meltingpt_BR
dc.subjectPseudosectionpt_BR
dc.subjectU-Pb zirconpt_BR
dc.subjectCollisional granitept_BR
dc.subjectRecyclingpt_BR
dc.titlePetrologic and geochronological constraints on the polymetamorphic evolution of the collisional granites, Araçuaí Orogen (SE Brazil).pt_BR
dc.typeArtigo publicado em periodicopt_BR
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