Investigating and quantifying deformation across the Itajaí foreland basin, Southern Brazil

• Grant number: 21/11048-0
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• Start date: April 01, 2023
• Status: Discontinued
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal Investigator: Miguel Angelo Stipp Basei
• Grantee: Rafael Moreti Arantes Vieira
• Host Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 15/03737-0 - The Rio de La Plata Craton and the Western Gondwana Assembly, AP.TEM
• Associated scholarship(s): 25/01257-2 - Constraining the evolution and deformation timescales in the Ediacaran Itajaí Foreland Basin using white mica in-situ Rb-Sr geochronology, BE.EP.DD

Abstract

The Itajaí foreland basin represents the north-northwest peripheral domain of the Dom Feliciano Belt, Southern Brazil. The basin was set and deformed during the late stages of Neoproterozoic orogenic cycle through the interaction between the Rio de La Plata, Congo and Kalahari cratons. The area of study has been mapped for decades altough questions about the local stratigraphy and deformation still remain. Structural investigation of a foreland basin with low or absent metamorphism allows quantifying shortening at different scales. The orogenic shortening and restored sections have been key tools in analyzing foreland basin deformation like Andes, Sevier and Appalaches and further improves geological knowledge about upper crust and late-stage orogenic deformation. The project aim is to quantify orogenic shortening and model the basin geometry through geological sections across the area and produce a multiscale deformation analysis. Restoring and balancing cross-sections are the main proposed methods which enables kinematically feasible geological model building. The sections and restored models can be enriched by the output data of granular scale strain analysis and information about the strain partitioning that took place on the basin layers/rocks by the finite strain methods and recognize the deformation ages by low temperature geochronology of illite fine fractions. The three-dimensional and restored models allow the basin reconstruction and contribution to the area's stratigraphic knowledge. (AU)