*** THIS WEEK ***
THURSDAY APRIL 25 12P/NOON PDT
I. Effect of mantle convection on the geodynamo behaviour in numerical models. Thomas Frasson, Université Grenoble Alpes
Paleomagnetic evidence shows that the behaviour of the geodynamo has changed during geological times. These behaviour changes are visible through variations in the strength and stability of the magnetic dipole. Variations in the heat flux at the core-mantle boundary (CMB) due to mantle convection have been suggested as one possible mechanism capable of driving such a change of behaviour.
Coupling mantle convection models and geodynamo models is crucial to understanding how the geodynamo can react to variations in mantle convection. This coupling can be studied by …
II. The Influence of Mantle Convection on Earth’s Geomagnetic Field Observables. Daniel Thallner, University of Florida
Studying the geomagnetic field and its variations over geological timescales provides insights into the geodynamo and deep Earth processes. Notably, a significant weak-field anomaly in the paleomagnetic record during the Precambrian-Cambrian transition suggests a shift from a thermally driven to a compositionally driven geodynamo upon inner core nucleation. However, a similar field behavior is indicated by weak geomagnetic field strengths observed …
THURSDAY May 9 12P/NOON PDT
Interactions Between Tectonic and Surface Processes: Insights from 2-D and 3-D Geodynamic Modeling
Thomas Theunissen, University of Bergen
The interface between the solid Earth and its outer layer composed of the atmosphere, hydrosphere, and biosphere hosts crucial mechanical and chemical processes. These processes drive erosion, sediment transport, and deposition, responsible for mass redistribution across the Earth’s surface. In this presentation, we first review how the coupling between the solid Earth and surface processes can be modeled and implemented inside 2-D and 3-D long-term geodynamics models. We then delve into the feedback between tectonics and surface processes that shape the Earth’s landscape. Through examples drawn from both 2-D and 3-D geodynamic models, we demonstrate how surface processes, from the scale of a fault to larger basin or mountain scales, influence tectonic behavior and reciprocally how tectonics and isostasy influence the landscape evolution.
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