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From breakup to continental collision: Influence of rifted margins on the dynamics of collisional orogens through time

Grant number: 21/06670-4
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): June 01, 2022
Effective date (End): October 31, 2025
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geophysics
Principal Investigator:Victor Sacek
Grantee:João Pedro Macedo Silva
Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:16/06114-6 - The Neoproterozoic Earth System and the rise of biological complexity, AP.TEM

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 subduction pattern of oceanic lithosphere at convergent zones and the resulting structure of the orogens varied since Precambrian. However, 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 orogens from previous rifted continental margins considering a variable initial thermal structure to upper mantle, according to Earth's geological age, to evaluate the role of the upper mantle thermal structure and the geometry of rifted margins on the formation and evolution of Fanerozoic and Neoproterozoic orogens. The simulations 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.

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