| Full text | |
| Author(s): |
Hernandez Tasco, Lizeth
;
Moraes, Renato
Total Authors: 2
|
| Document type: | Journal article |
| Source: | INTERNATIONAL JOURNAL OF EARTH SCIENCES; v. 111, n. 5, p. 18-pg., 2022-05-11. |
| 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-Guaxupe Nappe, the metasedimentary-derived migmatite unit and the basal granulite unit, from the southernmost portion of the Brasilia 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. (AU) | |
| FAPESP's process: | 16/22627-3 - Metamorphism and partial melting in ancient orogens II |
| Grantee: | Renato de Moraes |
| Support Opportunities: | Regular Research Grants |