Abstract
The main objective of this study is to contribute to the understanding of the deformation of leucosome and its residue in diatexites and granulites using as examples two units of the Socorro-Guaxupé Nappe, the metasedimentary-derived migmatite unit and the basal granulite unit, from the southernmost portion of the Brasília Orogen. The first unit is dominated by diatexite at its base, and the second unit is composed primarily of felsic granulite. After textural characterization of oriented samples, deformation temperatures are determined by (i) quartz c-axis fabric thermometry and (ii) cathodoluminescence-based Ti-in-quartz thermometry. The results are compared with thermobarometry data obtained from the associated residues. This establishes that the crystallization in the metasedimentary-derived migmatite unit and the basal granulite unit occurred along the cooling portion of the P–T path, but in some portions of the P–T path, these units were deformed and might be related to medium and high temperatures. Therefore, when the granulite is in the solid state, the diatexite is still in the dominantly liquid state, thus the granulite registers higher deformation temperatures that the diatexite simply cannot register due to its still mostly liquid state.
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Acknowledgements
Authors would like to thank São Paulo Research Foundation (FAPESP—by its acronyms in Portuguese) for financial support (Grant 16/22627-3). LH Tasco acknowledgments his CAPES (88882.377662/2019-01) scholarship. All analyses were made at the Laboratories of the NAP Geoanalítica, Institute of Geosciences, University of São Paulo, Brazil. RM is a CNPq research fellow (305720/2020-1). Authors would like to thank both reviewers, Jörn H. Kruhl for their constructive reviews and Edward W. Sawyer not only for their comments, but also for their English suggestions that helped to improve the manuscript.
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Financial research support by FAPESP (grant 16/22627-3).
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LH Tasco did field work, petrography, deformation temperatures calculation, thermobarometry calculations and prepared the figures. R Moraes provided guidance regarding Brazilian Geology, petrography, work on deformation temperatures and thermobarometry aspects and took part in the fieldwork as well.
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Hernandez Tasco, L., Moraes, R. Relation between partial melting, granulite metamorphism, crystallization, deformation of leucosome and the influence of these processes on the cooling of the root of a hot orogen. Int J Earth Sci (Geol Rundsch) 111, 1395–1412 (2022). https://doi.org/10.1007/s00531-022-02185-2
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DOI: https://doi.org/10.1007/s00531-022-02185-2