Metamorphism of retroeclogites from the Passos Nappe, Southern Brasília Orogen

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Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUniversity of Gothenburg-
Autor(es): dc.creatorSantos, Caio A.-
Autor(es): dc.creatorLuvizotto, George L.-
Autor(es): dc.creatorMoraes, Renato-
Autor(es): dc.creatorFumes, Regiane A.-
Autor(es): dc.creatorZack, Thomas-
Data de aceite: dc.date.accessioned2025-08-21T21:55:12Z-
Data de disponibilização: dc.date.available2025-08-21T21:55:12Z-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2021-11-30-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.jsames.2021.103625-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/229895-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/229895-
Descrição: dc.descriptionHigh-pressure metamafic rocks from the Passos Nappe, Southern Brasília Orogen, have been traditionally interpreted as highly retrogressed eclogites, even though no reliable P-T conditions were available thus far. In this work, samples from the least retrogressed sample were studied using petrography, mineral and whole-rock chemical analysis, thermodynamic modelling, and rutile U–Pb geochronology, with the objective of unravelling its metamorphic history. The studied rocks are, descriptively, hornblende-garnet-clinopyroxene schists. Garnet and hornblende occur in a matrix composed of clinopyroxene-plagioclase symplectite, with garnet being surrounded by plagioclase-hornblende coronas. A combination of thermodynamic modelling, Zr-in-rutile and Ti-in-quartz thermobarometry suggests peak temperature to be 725 ± 30 °C, attained at a minimum pressure of ≈16 kbar, and data from rutile and quartz crystals included in garnet qualitatively indicate an earlier stage at higher P and lower T, constraining a clockwise P-T path. No evidences of UHP metamorphism were found thus far. A lower intercept age of 579 ± 23 Ma was calculated from rutile data, which is identical, within uncertainty, to rutile ages obtained previously in units immediately above the rocks studied here. The data suggests that these rocks were submitted to a different P-T path compared to the adjacent units, and that they were subducted to depths of at least ≈60 km and tectonically emplaced amid the surrounding metapelitic rocks before 579 Ma, which is compatible with current models for the evolution of the Southern Brasilia Orogen.-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionDepartment of Mineralogy and Geotectonics Institute of Geosciences University of São Paulo, Rua do Lago, 562-
Descrição: dc.descriptionDepartment of Petrology and Metallogeny São Paulo State University, Av. 24A, 1515-
Descrição: dc.descriptionDepartment of Earth Sciences University of Gothenburg, PO Box 460-
Descrição: dc.descriptionDepartment of Petrology and Metallogeny São Paulo State University, Av. 24A, 1515-
Descrição: dc.descriptionFAPESP: 13/04007-0-
Descrição: dc.descriptionFAPESP: 15/05230-0-
Descrição: dc.descriptionFAPESP: 16/22627-3-
Descrição: dc.descriptionCNPq: 305720/2020-1-
Descrição: dc.descriptionCNPq: 311606/2019-9-
Descrição: dc.descriptionCNPq: 486328/2013-9-
Idioma: dc.languageen-
Relação: dc.relationJournal of South American Earth Sciences-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectPseudosection-
Palavras-chave: dc.subjectRetroeclogite-
Palavras-chave: dc.subjectSouthern Brasília Orogen-
Palavras-chave: dc.subjectTrace-element thermobarometry-
Título: dc.titleMetamorphism of retroeclogites from the Passos Nappe, Southern Brasília Orogen-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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