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The granite magmatism of Dom Feliciano Belt and its role in the neoproterozoic Western Gondwana amalgamation

Grant number: 06/06957-1
Support type:Regular Research Grants
Duration: December 01, 2007 - November 30, 2010
Field of knowledge:Physical Sciences and Mathematics - Geosciences
Principal Investigator:Miguel Angelo Stipp Basei
Grantee:Miguel Angelo Stipp Basei
Home Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The analysis of microstructures in combination with the reconstruction of the spatial distribution of linear and planar fabrics within plutonic rocks can make them delicate kinematic indicators in the unravelling of polyphase orogenic processes. Within the Dom Feliciano Belt of south-eastern Brazil and Uruguay large volumes of granitoid melts have formed extensive batholiths throughout the Neoproterozoic, that document the diachronic accretion of different basement domains during the Río Doce orogeny throughout the Ediacaran. In the Santa Catarina State collision started at ~610 Ma with the juxtaposition of the Brusque metamorphic complex against the Florianópolis batholith. This was followed by the thrusting of the Brusque Metamorphic Complex on top of the Itajaí foreland basin at ~535 Ma. Under the focus of the presented project is the understanding of the emplacement kinematics of three closely related granitoid suites within the Brusque metamorphic complex, i.e. the São João Batista, the Valsungana and the Nova Trento granitoid suites. All suites have been considered to be syn- to post-kinematically emplaced with respect to the collision between the Florianópolis batholith and the Brusque metamorphic complex. The determination of the anisotropy of magnetic susceptibility has proven to be a powerful tool in the analyses of the weakly developed linear and planar fabrics in igneous rocks. These in combination with a icrostructural study of the magmatic vs. sub-solidus origin of fabrics will elucidate the regional stress field during the latest stages of the formation of Western Gondwana. Geochronological and petrographic data will be discussed in terms of rotational exhumation of the granitoids and their host. Results will verify the original orientation of magmatic fabrics at the time of magmaemplacement. Additional information on the temperature development in the contact aureole of the granitic bodies in combination with supplementary age constrains provide a basis for the application of a thermal simulation code. Geochemical data including isotope results will be discussed in terms of the geological setting in which the granitic melt segregated. (AU)

Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
HUECK, MATHIAS; STIPP BASEI, MIGUEL ANGELO; DE CASTRO, NEIVALDO ARAUJO. Origin and evolution of the granitic intrusions in the Brusque Group of the Dom Feliciano Belt, south Brazil: Petrostructural analysis and whole-rock/isotope geochemistry. Journal of South American Earth Sciences, v. 69, p. 131-151, AUG 2016. Web of Science Citations: 6.
MEIRA, VINICIUS TIEPPO; CAMPOS NETO, MARIO DA COSTA; DIEGO GONZALEZ, PABLO; STIPP BASEI, MIGUEL ANGELO; VARELA, RICARDO. Ordovician klippen structures of the Sierra de Umango: New insights on Tectonic evolution of the Western Sierras Pampeanas, Argentina. Journal of South American Earth Sciences, v. 37, p. 154-174, AUG 2012. Web of Science Citations: 4.
BASEI, M. A. S.; CAMPOS NETO, M. C.; CASTRO, N. A.; NUTMAN, A. P.; WEMMER, K.; YAMAMOTO, M. T.; HUECK, M.; OSAKO, L.; SIGA, O.; PASSARELLI, C. R. Tectonic evolution of the Brusque Group, Dom Feliciano belt, Santa Catarina, Southern Brazil. Journal of South American Earth Sciences, v. 32, n. 4, SI, p. 324-350, DEC 2011. Web of Science Citations: 29.
STIPP BASEI, MIGUEL ANGELO; BRITO NEVES, BENJAMIM BLEY; SIGA JUNIOR, OSWALDO; BABINSKI, MANY; PIMENTEL, MARCIO MARTINS; GAETA TASSINARI, COLOMBO CELSO; BEZERRA HOLLANDA, MARIA HELENA; NUTMAN, ALLEN; CORDANI, UMBERTO GIUSEPPE. Contribution of SHRIMP U-Pb zircon geochronology to unravelling the evolution of Brazilian Neoproterozoic fold belts. Precambrian Research, v. 183, n. 1, SI, p. 112-144, NOV 1 2010. Web of Science Citations: 32.

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