Thermal history and fluid circulation along deformational structures associated with the Bambuí Group in the external portion of the Brasília Belt (Unaí, Minas Gerais State)

• Grant number: 15/13901-1
• Support Opportunities: Scholarships in Brazil - Master
• Start date: March 01, 2016
• End date: October 31, 2017
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal Investigator: Frederico Meira Faleiros
• Grantee: Melina Cristina Borges Esteves
• Host Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

This Project aims to elaborate a model about the thermal history and fluid circulation in the Bambuí Group (Cryogenian to Ediacaran-Cambrian), along the external portion of the Brasília Belt. We selected to study the region of the Unaí City (Brazilian State of Minas Gerais), where the Bambuí Group rocks are intensely deformed, although previous studies have reported incipient metamorphism. The thermal history will be evaluated based on petrographic and microsctructural studies, and using geothermometers applicable to low-temperature rocks, such as chlorite-quartz and biotite-muscovite, and the geothermometer based on quartz thermoluminescence. Fluid circulation along deformational structures (faults, folds and fractures) will be studied by means of microthermometric analysis of fluid inclusion assemblages present in hydrothermal veins, which allow characterizing the composition and physical-chemical characteristics of the fluids and their temperature and pressure trapping conditions. Vein samples collected from known structural contexts will allow assessing the relationships between fluid characteristics and the processes of deformation and fluid migration. In addition to the more specific, summarized above objectives, the project can contribute to the scientific knowledge on the deformational and metamorphic evolution of the Bambuí Group and the external portion of the Brasília Belt; and a better evaluation of the petroleum system and exploration targets associated with the Bambuí Group.

Scientific publications

(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)

ESTEVES, MELINA C. B.; FALEIROS, FREDERICO M.. Fluid flow and syntectonic veining in an Ediacaran-Cambrian foreland fold-thrust zone, western margin of the Sao Francisco Craton, Brazil. JOURNAL OF THE GEOLOGICAL SOCIETY, v. 178, n. 3, FEB 2021. (15/13901-1)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

ESTEVES, Melina Cristina Borges. Thermal history and fluid circulation in deformational structures associated with the Bambuí Group at the fold-and-thrust zone, western margin of the São Francisco Craton. 2018. Master's Dissertation - Universidade de São Paulo (USP). Instituto de Geociências (IG/BT) São Paulo.