Journal
COMPTES RENDUS PHYSIQUE
Volume 11, Issue 3-4, Pages 304-315Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.crhy.2010.07.011
Keywords
Olivine; Dislocations; High pressure; Viscoplasticity; Polycrystal; Homogenization; Earth mantle
Funding
- Centre National de la Recherche Scientifique CNRS/INSU
- CNRS
- Agence Nationale de la Recherche (ANR) [BLAN08-2_343541]
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The strongly anisotropic rheology of olivine polycrystals, associated to their microstructure, constitutes a key feature affecting the dynamics of the Earth's upper mantle. High pressure deformation experiments carried out on olivine single crystals under synchrotron radiation, together with estimations of lattice friction based on first-principle calculations, show a transition from easy [100] to easy [001] slips as pressure and temperature (thus depth) increases. We input these data at the slip system level into the second-order extension of the self-consistent scheme to assess microstructure evolution along a typical flow pattern beneath an oceanic spreading center. (C) 2010 Academic des sciences. Published by Elsevier Masson SAS. All rights reserved.
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