Ab initio modeling of seismic velocities in aggregates and melts for the interpretation of a new seismic tomography model: towards new constraints on the upper-mantle thermochemical structure beneath South America

• Grant number: 24/02580-9
• Support Opportunities: Research Grants - Visiting Researcher Grant - International
• Start date: May 15, 2024
• End date: August 31, 2024
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geophysics
• Principal Investigator: Carlos Alberto Moreno Chaves
• Grantee: Carlos Alberto Moreno Chaves
• Visiting researcher: Renata Maria Mattosinho Wentzcovitch
• Visiting researcher institution: Columbia University In The City Of New York/Cu, United States
• Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

As the Earth's interior behaves elastically, the propagation of seismic waves is determined by the elastic constants of the component material. Comparing the elastic properties of potentially relevant minerals with seismic observations allows us to relate these observations to geological processes and the thermal and chemical state of our planet. Thus, this research seeks to employ ab initio modeling techniques to advance our understanding of seismic velocities in aggregates and melts, with a specific focus on interpreting a new upper-mantle seismic tomography model beneath South America, which is being derived through the FAPESP Regular Project 2022/04357-0. By integrating seismic tomography velocity-attenuation models with high-pressure mineral physics principles, we aim to elucidate the complex interplay between temperature, composition, and geodynamic processes within the Earth's upper mantle, particularly for the upper mantle underneath South America. (AU)