Abstract
The 3.30 Ga high-silica volcanic system of the Gavião Block, São Francisco Craton, represents the remnants of within-plate magmatism related to an intracontinental rift. However, the petrogenetic processes that may have taken place in the relatively shallow primitive continental crust has not been fully constrained due to a scarce record. Petrographic and chemical analyses in biotite, as well as in-situ Sr isotope ratios in plagioclase, were used to trace petrogenetic processes and physicochemical conditions of the magmatic system. The subvolcanic rock has a well-preserved primary volcanic feature represented by magma flow textures, euhedral to subhedral plagioclases, rapakivi microstructures, and glomerocrysts. Plagioclase populations formed at two distinct stages recorded by trace elements and Sr isotope. Plagioclase phenocrysts and rapakivi phenocrysts have a slight enrichment of light rare earth elements (LREE), Sr/Ba ratio, and slight variation of Sr isotopes composition. Meanwhile, other phenocrysts and rapakivi crystals have low LREE, Sr/Ba, and a limited variation of Sr isotope ratio. Mineral chemistry evidence points to country rock assimilation during plagioclase formation and a crustal source for primary biotites under oxidized conditions.
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Acknowledgements
Author E.M.B.F wishes to thank the Fundação de Amparo à Pesquisa do Estado de Minas Gerais and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior for providing a scholarship. We gratefully appreciate the assistance of the Microscopy and Microanalysis Laboratory, and the Isotopic Geochemistry Laboratory of Federal University of Ouro Preto, Minas Gerais State, Brazil. We are also grateful to three anonymous reviewers and the handling Editor Chao Wang for their thoughtful and constructive comments and suggestions that improved the quality of the manuscript.
Funding
Author E.M.B.F was funded by Fundação de Amparo à Pesquisa do Estado de Minas Gerais and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior. S. A. Z. received financial support from Ministério da Ciência, Tecnologia e Inovação and Conselho de Desenvolvimento Científico e Tecnológico (436648/2018), Fundação de Apoio a Pesquisa do Distrito Federal (193.001.263/2017), and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior and Conselho de Desenvolvimento Científico e Tecnológico (465613/2014-4).
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Branches Farias, E.M., Lana, C.C., Zincone, S.A. et al. Mineral-scale insights into the petrogenesis of the 3.30 Ga rhyolite in the Contendas-Mirante region, northern São Francisco Craton, Brazil: implications from results of plagioclase and biotite analyses. Miner Petrol 118, 41–54 (2024). https://doi.org/10.1007/s00710-023-00842-1
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DOI: https://doi.org/10.1007/s00710-023-00842-1