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.
La forte anisotropie rhéologique des polycristaux d'olivine, associée à leur microstructure, est un aspect majeur affectant la dynamique du manteau terrestre supérieur. Des expériences de déformation sous haute pression et en rayonnement synchrotron de monocristaux d'olivine, complétées par des calculs ab initio de friction de réseau, montrent une transition du système « mou » depuis [100] vers [001] quand la pression et la température (et donc la profondeur in situ) augmentent. Nous avons introduit ces données à l'échelle du système de glissement dans l'extension du second-ordre du schéma auto-cohérent afin d'appréhender les évolutions de microstructure le long d'un écoulement typique sous une dorsale océanique.
Mot clés : Olivine, Dislocations, Haute pression, Viscoplasticité, Polycristal, Homogénéisation, Manteau terrestre
Olivier Castelnau 1; Patrick Cordier 2; R.A. Lebensohn 3; Sébastien Merkel 2; Paul Raterron 2
@article{CRPHYS_2010__11_3-4_304_0, author = {Olivier Castelnau and Patrick Cordier and R.A. Lebensohn and S\'ebastien Merkel and Paul Raterron}, title = {Microstructures and rheology of the {Earth's} upper mantle inferred from a multiscale approach}, journal = {Comptes Rendus. Physique}, pages = {304--315}, publisher = {Elsevier}, volume = {11}, number = {3-4}, year = {2010}, doi = {10.1016/j.crhy.2010.07.011}, language = {en}, }
TY - JOUR AU - Olivier Castelnau AU - Patrick Cordier AU - R.A. Lebensohn AU - Sébastien Merkel AU - Paul Raterron TI - Microstructures and rheology of the Earth's upper mantle inferred from a multiscale approach JO - Comptes Rendus. Physique PY - 2010 SP - 304 EP - 315 VL - 11 IS - 3-4 PB - Elsevier DO - 10.1016/j.crhy.2010.07.011 LA - en ID - CRPHYS_2010__11_3-4_304_0 ER -
%0 Journal Article %A Olivier Castelnau %A Patrick Cordier %A R.A. Lebensohn %A Sébastien Merkel %A Paul Raterron %T Microstructures and rheology of the Earth's upper mantle inferred from a multiscale approach %J Comptes Rendus. Physique %D 2010 %P 304-315 %V 11 %N 3-4 %I Elsevier %R 10.1016/j.crhy.2010.07.011 %G en %F CRPHYS_2010__11_3-4_304_0
Olivier Castelnau; Patrick Cordier; R.A. Lebensohn; Sébastien Merkel; Paul Raterron. Microstructures and rheology of the Earth's upper mantle inferred from a multiscale approach. Comptes Rendus. Physique, Volume 11 (2010) no. 3-4, pp. 304-315. doi : 10.1016/j.crhy.2010.07.011. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2010.07.011/
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