Stationary points in activation energy for heat dissipated with a power law temperature-dependent viscoelastoplastic rheology

B. D. So, D. A. Yuen

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We report that there exist a local maximum and minimum in the activation energy Ea describing mechanical heat dissipation of olivine for a given initial temperature and amount of deformation. The stationary point for the minimum dissipation is ~200 kJ/mol lower than that for the maximum. For larger activation energy than the stationary point for maximum dissipation, plastic deformation is sharply weakened and the temperature rise disappears altogether. Higher values of the initial temperature produce a larger local maximum for activation energy. The amount of heat dissipation increases with Ea in a nonlinear manner. Our results have direct ramifications on shear zone, which is governed by the amount of mechanical heat dissipation. We have observed them over a wide range of temperature and deformation boundary conditions. Our two-dimensional model study can provide valuable insight to enable greater predictive capability for the development of geodynamic shear zone in planetary-scale plate tectonics.

Original languageEnglish (US)
Pages (from-to)4953-4960
Number of pages8
JournalGeophysical Research Letters
Volume41
Issue number14
DOIs
StatePublished - Jul 28 2014

Keywords

  • activation energy
  • planetary-scale failure
  • power law rheology
  • shear heating

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