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Microstructures and rheology of the Earth's upper mantle inferred from a multiscale approach

Article dans une revue avec comité de lecture
Author
CASTELNAU, Olivier
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
CORDIER, Patrick
174496 Unité Matériaux et Transformations - UMR 8207 [UMET]
LEBENSON, RA
300158 Los Alamos National Laboratory [LANL]
MERKEL, SEBASTIEN
174496 Unité Matériaux et Transformations - UMR 8207 [UMET]
RATERRON, PAUL
174496 Unité Matériaux et Transformations - UMR 8207 [UMET]

URI
http://hdl.handle.net/10985/15116
DOI
10.1016/j.crhy.2010.07.011
Date
2010
Journal
Comptes Rendus Physique

Abstract

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

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