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Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/52330
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dc.creatorLorena Martinspt_BR
dc.creatorCristiano Lanapt_BR
dc.creatorAriela Mazozpt_BR
dc.creatorTiago Amâncio Novopt_BR
dc.date.accessioned2023-04-20T21:01:38Z-
dc.date.available2023-04-20T21:01:38Z-
dc.date.issued2021-
dc.citation.volume13pt_BR
dc.citation.issue5pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.gsf.2021.101289pt_BR
dc.identifier.issn2588-9192pt_BR
dc.identifier.urihttp://hdl.handle.net/1843/52330-
dc.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.pt_BR
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológicopt_BR
dc.format.mimetypepdfpt_BR
dc.languageengpt_BR
dc.publisherUniversidade Federal de Minas Geraispt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentIGC - DEPARTAMENTO DE GEOLOGIApt_BR
dc.publisher.initialsUFMGpt_BR
dc.relation.ispartofGeoscience Frontierspt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectArcheanpt_BR
dc.subjectSão Francisco Cratonpt_BR
dc.subjectCrustal reworkingpt_BR
dc.subjectU-Pb geochronologypt_BR
dc.subjectLu-Hf isotopespt_BR
dc.subject.otherGeologia estratigrafica - arqueanopt_BR
dc.subject.otherCratons - São Francisco, Riopt_BR
dc.subject.otherAbrasão Químicapt_BR
dc.titleChemical-abrasion u-pb zircon geochronology reveals 150 myr of partial melting events in the archean crust of the são francisco cratonpt_BR
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 Franciscopt_BR
dc.typeArtigo de Periódicopt_BR
dc.url.externahttps://www.sciencedirect.com/science/article/pii/S1674987121001535?via%3Dihubpt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-6302-9706pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-2423-4149pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-1999-862Xpt_BR
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