Duretz, T., de Borst, R., Yamato, P. et al. (1 more author) (2020) Toward robust and predictive geodynamic modeling : the way forward in frictional plasticity. Geophysical Research Letters, 47 (5). ISSN 0094-8276
Abstract
Strain localization is a fundamental characteristic of plate tectonics. The resulting deformation structures shape the margins of continents and the internal structure of tectonic plates. To model the occurrence of faulting, geodynamic models generally rely on frictional plasticity. Frictional plasticity is normally embedded in visco‐plastic (V‐P) or visco‐elasto‐plastic (V‐E‐P) rheologies. This poses some fundamental issues, such as the difficulty, or often inability, to obtain a converged equilibrium state and a severe grid sensitivity. Here, we study shear banding at crustal‐scale using a visco‐elasto‐viscoplastic (V‐E‐VP) model. We show that this rheology allows to accurately satisfy equilibrium, leads to shear band patterns that converge upon mesh refinement, and preserves characteristic shear band angles. Moreover, a comparison with analytic models and laboratory data reveals that V‐E‐VP rheology captures first‐order characteristics of frictional plasticity. V‐E‐VP models thus overcomes limitations of V‐P and V‐E‐P models and appears as an attractive alternative for geodynamic modeling.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 American Geophysical Union. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | faulting; geodynamics; numerical modeling; plasticity; rheology; tectonics |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Civil and Structural Engineering (Sheffield) |
Funding Information: | Funder Grant number European Commission - Horizon 2020 664734 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 01 Apr 2020 07:32 |
Last Modified: | 10 Sep 2020 00:38 |
Status: | Published |
Publisher: | American Geophysical Union (AGU) |
Refereed: | Yes |
Identification Number: | 10.1029/2019gl086027 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:158953 |