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From breakup to continental collision: influence of rifted margins on the dynamics of colisional orogens through time

Grant number: 23/08679-4
Support Opportunities:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): November 10, 2023
Effective date (End): November 09, 2024
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geophysics
Principal Investigator:Victor Sacek
Grantee:João Pedro Macedo Silva
Supervisor: Gianreto Manatschal
Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Research place: Université de Strasbourg, France  
Associated to the scholarship:21/06670-4 - From breakup to continental collision: Influence of rifted margins on the dynamics of collisional orogens through time, BP.DR

Abstract

The Earth's tectonic regime evolved over geological history culminating in the present Plate Tectonics. Due to secular cooling of the planet over billions of years, it is expected that in the past, its thermal and rheological structure were different, affecting the deformation pattern of crust and lithospheric mantle over geological time. Previous investigations based on thermomechanical numerical models showed that the oceanic and continental subduction patterns at convergent zones varied since Precambrian. However, for the transition from oceanic to continental subduction, these works considered that the continental margins used in convergence had a simplified geometry and did not consider structural inheritances of previous lithospheric stretching. So, this project aims to numerically simulate the formation of rifted margins considering a variable initial thermal structure and chemistry of the upper mantle, according to Earth's geological age, to evaluate how these parameters affect the architecture and magmatic budget of rifted margins throughout the Archean to the present. The outcome of these simulations will be further used to evaluate how different rifted margins affect continental subduction in the context of supercontinent formation, from Nuna to Pangea. The numerical scenarios will be simulated in the numerical model MANtle DYnamics simulatOr Code (MANDYOC) which allows the simulation of thermomechanical evolution of lithosphere and asthenospheric mantle incorporating nonlinear rheologies over geological time scale. 2D and 3D numerical scenarios will be explored during the project, using geological and geophysical constraints, to evaluate the viability of conceptual models presented previously in the scientific literature. (AU)

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