EGU22-12496
https://doi.org/10.5194/egusphere-egu22-12496
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Numerical modelling of lithospheric deformations with frictional plasticity

Thibault Duretz1,4, René de Borst2, Ludovic Räss3, Phillippe Yamato4, Tim Hageman5, and Laetitia Le Pourhiet6
Thibault Duretz et al.
  • 1Institut für Geowissenschaften, Goethe‐Universität Frankfurt, Frankfurt, Germany
  • 2University of Sheffield, Department of Civil and Structural Engineering, Sir Frederick Mappin Building, Mappin Street
  • 3Laboratory of Hydraulics, Hydrology and Glaciology (VAW), ETH Zurich, Zurich, Switzerland
  • 4Univ Rennes, CNRS, Géosciences Rennes UMR 6118, F-35000 Rennes, France
  • 5Imperial College, London, Department of Civil and Environmental Engineering
  • 6Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut des Sciences de la Terre de Paris (iSTeP), 4 place Jussieu, 75005 Paris, France
Strain localisation is a key process that allows for the emergence of tectonic plates and controls their long-term deformation. Upper crustal levels are relatively cold and their rheology is thus governed by frictional plasticity. In order to predict the formation of tectonic plates and quantify the deformation of the Earth's upper shell, geodynamic modelling simulation tools must reliably account for deformation in the frictional plastic realm. 
Nevertheless, the simulation of frictional plastic strain localisation poses severe issues. Commonly employed implementations (visco-plastic and visco-elasto-plastic) often fail to accurately satisfy force balance and suffer from a lack of convergence upon mesh refinement. These problems are intimately linked to the fact that commonly employed models do not encompass any characteristic spatial or temporal scales of localisation. Various regularisation techniques can thus be used as a remedy. Here we investigate three popular regularisation techniques, namely viscoplasticity, gradient plasticity and the use of a Cosserat medium, and discuss their potential application for geodynamic modelling.  

How to cite: Duretz, T., de Borst, R., Räss, L., Yamato, P., Hageman, T., and Le Pourhiet, L.: Numerical modelling of lithospheric deformations with frictional plasticity, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-12496, https://doi.org/10.5194/egusphere-egu22-12496, 2022.

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