This project aims to study the kinematics and strain distribution in the eastern part of the Araçuaí Orogen, encompassing mainly the Carlos Chagas Leucogranite, which outcrops in the Ecoporanga and Barra do São Francisco regions, Espírito Santo state.Studies on strain distribution in hot lithosphere have been the topic of many discussions in the international geological community. Experimental studies sustain that partial melting weakens the rheology of these rocks, with only 10% of molten material (Rosenberg and Handy 2005). Recent models suggest that an almost totally molten middle crust has little resistance and sufficiently weak to allow gravity driven- lateral extrusion and channel flow (Clark and Royden 2000; Beaumont et al. 2001).The present research, the regional geology and the proposed objectives need data integration covering different domains of Geosciences. In summary, the main techniques to be used are as follows: Anisotropy of Magnetic Susceptibility, mainly to investigate the behavior of tectonic and magnetic fabrics of the Carlos Chagas Leucogranite and the intrusive granitoids between Barra do São Francisco and Ecoporanga towns. Additionally, Seismic Anisotropy studies will be performed in order to obtain information about the structure of the superior mantle under the alochtonous units and will also contribute to answer the question of whether there is a crust-mantle mechanical association during the deformational process.The Seismic Anisotropy measures (delay of teleseismic SKS waves) will be obtained with two broad-band stations from the Instituto de Astronomia e Geofísica of the Universidade de São Paulo, installed in the study area. These data will provide information to answer the above proposed questions, and will also allow comparison with previously obtained results in the southern portion of the Ribeira Belt (Heintz et al. 2003; Assumpção et al. 2006).The project will contribute to a deep knowledge of the geology of the eastern Araçuaí Orogen, not only in its regional aspect where a channel flow model could be tested and compared with another geologically similar regions, but also as a theme, bringing ways to comprehend the rheological behavior of partially molten deformed rocks.
News published in Agência FAPESP Newsletter about the scholarship: