The Socorro-Guaxupé Nappe crops out in southern Minas Gerais and it has an intermediate unit called Metaxite Unit, dominated by diatexites at its base, with large volumes of leucosome and schollen of stromatic garnet-biotite metatexite. Leucosome within the schollen crystallized via fractional crystallization and is dominated by plagioclase and quartz, although K-feldspar might be present. However, the larger volume of the coarse-grained leucosome, that dominates the unit, has granite, sometimes close to minimum granite composition. So, its formation, after partial melting, involved, segregation, fractional crystallization and accumulation. Proportions of leucosome / residue and leucosome / residue / peritectic phases indicate that the leucosome crystallized from more melt than a pelite source could produce, and probably diatexite worked as a pre-magmatic chamber and stocked melt produced from the granulites sitting at its bottom. Large proportion of biotite crystallized in the residue was formed due to equalization of water chemical potential between residue and leucosome.The Brasilia Orogen has been interpreted as the result of the neoproterozoic collision between the passive margin of the São Francisco and the active margin of the Paranapanema Evaluation of the contributions of possible sources to the leucosome of the diatexite of Socorro-Guaxupé Nappe, in the Alfenas Region, MG, Brazil Figure 10. Proportions of the migmatite parts recognized in field and normalized to 100%; peritectic garnet (Grt), leucosome (Leu) and schollen -residue (Rsd).
for his valuable guidance, dedication and support in the completion of this dissertation, and for having given me an opportunity to belong to his research group at the University of São Paulo. My thanks go to the São Paulo Research Foundation (FAPESP; 16/22627-3) and the Coordination for the Improvement of Higher Education Personnel (CAPES; 88882.377662/2019-01) for providing financial support over the duration of this research. My thanks also go to all of the faculty members in the Mineralogy and Geotectonics Department at the University of São Paulo, from whom I have had the opportunity to learn during the past three years. I am especially grateful to my colleagues Clara, Eduardo, Sebastian and Rafael for the accompaniment in the field work and our interesting discussions, likewise, I would like to thank Engineer Ricardo Luiz Malta Pena and the staff of Santa Terezinha quarry, in Alfenas, MG, who made it possible to collect samples for this study. Also, I want to extend my thanks to all of my friends in São Paulo for all of those great moments we spent together in Brazil,
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