Chemical-abrasion u-pb zircon geochronology reveals 150 myr of partial melting events in the archean crust of the são francisco craton

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dc.creatorLorena Martins
dc.creatorCristiano Lana
dc.creatorAriela Mazoz
dc.creatorTiago Amâncio Novo
dc.date.accessioned2023-04-20T21:01:38Z
dc.date.accessioned2025-09-09T01:03:49Z
dc.date.available2023-04-20T21:01:38Z
dc.date.issued2021
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.format.mimetypepdf
dc.identifier.doihttps://doi.org/10.1016/j.gsf.2021.101289
dc.identifier.issn2588-9192
dc.identifier.urihttps://hdl.handle.net/1843/52330
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofGeoscience Frontiers
dc.rightsAcesso Aberto
dc.subjectGeologia estratigrafica - arqueano
dc.subjectCratons - São Francisco, Rio
dc.subjectAbrasão Química
dc.subject.otherArchean
dc.subject.otherSão Francisco Craton
dc.subject.otherCrustal reworking
dc.subject.otherU-Pb geochronology
dc.subject.otherLu-Hf isotopes
dc.titleChemical-abrasion u-pb zircon geochronology reveals 150 myr of partial melting events in the archean crust of the são francisco craton
dc.title.alternativeA geocronologia de zircônio U-Pb por abrasão química revela eventos parciais de fusão de 150 milhões de anos na crosta arqueana do Cráton de São Francisco
dc.typeArtigo de periódico
local.citation.issue5
local.citation.volume13
local.description.resumoField observations and CA-LA-ICP-MS U–Pb zircon ages and Hf isotope compositions obtained from migmatitic orthogneisses and granitoids from the Belo Horizonte Complex, southern São Francisco Craton, indicate a major period of partial melting and production of felsic rocks in the Neoarchean. Our observations show that the complex is an important site for studying partial melting processes of Archean crystalline crust. Much of the complex exposes fine-grained stromatic migmatites that are intruded by multiple leucogranitic veins and sheeted dikes. Both migmatites and leucogranite sheets are crosscut by several phases of granitoid batholiths and small granitic bodies; both of which are closely associated with the host banded gneisses. Chemical abrasion followed by detailed cathodoluminescence imaging revealed a wide variety of zircon textures that are consistent with a long-lived period of partial melting and crustal remobilization. Results of U-Pb and Hf isotopes disclose the complex as part of a much wider crustal segment, encompassing the entire southern part of the São Francisco Craton. Compilation of available U-Pb ages suggests that this crustal segment was consolidated sometime between 3000 Ma and 2900 Ma and that it experienced three main episodes of partial melting before stabilization at 2600 Ma. The partial melting episodes took place between 2750 Ma and 2600 Ma as a result of tectonic accretion and peeling off the lithospheric mantle and lower crust. This process is likely responsible for the emplacement of voluminous potassic granitoids across the entire São Francisco Craton. We believe that the partial melting of Meso-Archean crystalline crust and production of potassic granitoids are linked to a fundamental shift in the tectonics of the craton, which was also responsible for the widespread intrusion of large syenitic bodies in the northern part of the craton, and the construction of layered mafic–ultramafic intrusions to the south of the BHC.
local.identifier.orcidhttps://orcid.org/0000-0001-6302-9706
local.identifier.orcidhttps://orcid.org/0000-0002-2423-4149
local.identifier.orcidhttps://orcid.org/0000-0002-1999-862X
local.publisher.countryBrasil
local.publisher.departmentIGC - DEPARTAMENTO DE GEOLOGIA
local.publisher.initialsUFMG
local.url.externahttps://www.sciencedirect.com/science/article/pii/S1674987121001535?via%3Dihub

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