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Contrasting oxygen fugacity of I- and S-type granites from the Araçuaí orogen, SE Brazil: an approach based on opaque mineral assemblages

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Abstract

This study presents mineralogical characterization of opaque assemblages from I- and S-type granites from the Araçuaí orogen, southeastern Brazil that belong respectively, to the pre- and syn-collisional stages of the orogeny. Although these granites are geochemically well-characterized, with a robust geochemical, isotopic and geochronological database, their opaque minerals have not yet been investigated, and they provide important information about the oxygen fugacity and temperature conditions of their magmas. I-type granites (G1 Supersuite) consist of biotite hornblende granites and their opaque assemblage is ilmenite + pyrite + pyrrhotite ± magnetite ± Fe-Ti oxides ± chalcopyrite. S-type rocks (G2 Supersuite) are biotite muscovite sillimanite granites with ilmenite + graphite + pyrrhotite + pyrite as opaques. Our results combined with literature data show that ranges for oxygen fugacity (fO2) are: I-type granitoids containing magnetite and free of pyrite and phyrrhotite likely crystallized under fO2 between 10−15 bars and 10–8.5 bars, whereas magnetite free rocks containing pyrite and pyrrhotite should have crystallized with fO2 higher than 10−18 bars and lower than 10−15 bars. Regarding S-type granites, they must have crystallized under fO2 lower than 10−18 bars.

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Acknowledgements

We are grateful to Prof. Maarten A.T.M. Broekmans for the careful editorial handling, and anonymous reviewers, whose criticism led to significant improvement of the manuscript. We acknowledge the Microanalysis Laboratory of the Universidade Federal de Ouro Preto (UFOP), a member of the Microscopy and Microanalysis Network of Minas Gerais State/Brazil/FAPEMIG, for the mineral chemistry analyses. We also would like to thank Prof. Fernando Alkmim (UFOP) and Prof. Antônio Pedrosa-Soares (UFMG) for the motivation and constructive discussions about the genesis of granites from the Araçuaí orogen, and Prof. Hermínio Nalini Jr. (UFOP) for providing his thin sections that gave additional information to this study. We thank Marco Paulo Castro, Débora Vasconcellos and Profa. Gláucia Queiroga (Microanalysis Laboratory of the Universidade Federal de Ouro Preto, DEGEO-EM-UFOP) for analytical facilities and assistance, Prof. Edison Tazava (UFOP) for helping in the identification of opaque phases under reflected light and Geraldo Sampaio for his contribution with chemical calculations. The comments and criticism of Dr. Luiz Grafulha Morales have contributed to the improvement of the original version of the manuscript and is gratefully appreciated. This research was partially supported by a UFOP researcher fellowship, process 23109.003268/2017-47.

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  1. Departamento de Geologia, Escola de Minas, Universidade Federal de Ouro Preto, Morro do Cruzeiro, Ouro Preto, MG, 35400-000, Brazil

    Jordania Cristina dos Santos Dias, Leonardo Gonçalves & Cristiane C. Gonçalves

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  1. Jordania Cristina dos Santos Dias
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dos Santos Dias, J.C., Gonçalves, L. & Gonçalves, C.C. Contrasting oxygen fugacity of I- and S-type granites from the Araçuaí orogen, SE Brazil: an approach based on opaque mineral assemblages. Miner Petrol 113, 667–686 (2019). https://doi.org/10.1007/s00710-019-00670-2

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