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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Evaluation of the contributions of possible sources to the leucosome of the diatexite of Socorro-Guaxupe Nappe, in the Alfenas Region, MG, Brazil

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Tasco, Lizeth Hernandez [1] ; Moraes, Renato [2]
Total Authors: 2
[1] Univ Sao Paulo, Inst Geociencias, Programa Geociencias Mineral & Petrol, Sao Paulo, SP - Brazil
[2] Univ Sao Paulo, Inst Geociencias, Dept Mineral & Geotecton, Sao Paulo, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: BRAZILIAN JOURNAL OF GEOLOGY; v. 49, n. 1 2019.
Web of Science Citations: 0

The Socorro-Guaxupe 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. (AU)

FAPESP's process: 16/22627-3 - Metamorphism and partial melting in ancient orogens II
Grantee:Renato de Moraes
Support type: Regular Research Grants