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

Olivier Castelnau; Patrick Cordier; R.A. Lebensohn; Sébastien Merkel; Paul Raterron

doi:10.1016/j.crhy.2010.07.011

Computational metallurgy and changes of scale / Métallurgie numérique et changements d'échelle

Microstructures and rheology of the Earth's upper mantle inferred from a multiscale approach
[Microstructures et rhéologie du manteau terrestre supérieur déduites d'une approche multi-échelle]

Olivier Castelnau ¹ ; Patrick Cordier ² ; R.A. Lebensohn ³ ; Sébastien Merkel ² ; Paul Raterron ²

¹ PIMM, CNRS, arts et métiers ParisTech, 151, boulevard de l'Hopital, 75013 Paris, France
² Unité matériaux et transformations, bâtiment C6, université Lille 1, 59655 Villeneuve d'Ascq, France
³ MST8 - MS G755, Los Alamos National Laboratory, Los Alamos, NM 87545, USA

Comptes Rendus. Physique, Volume 11 (2010) no. 3-4, pp. 304-315.

Résumé
Abstract

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.

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.

Publié le : 2010-04-01

DOI : 10.1016/j.crhy.2010.07.011

Keywords: Olivine, Dislocations, High pressure, Viscoplasticity, Polycrystal, Homogenization, Earth mantle
Mot clés : Olivine, Dislocations, Haute pression, Viscoplasticité, Polycristal, Homogénéisation, Manteau terrestre

Affiliations des auteurs :

Olivier Castelnau ¹ ; Patrick Cordier ² ; R.A. Lebensohn ³ ; Sébastien Merkel ² ; Paul Raterron ²

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     title = {Microstructures and rheology of the {Earth's} upper mantle inferred from a multiscale approach},
     journal = {Comptes Rendus. Physique},
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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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