Microstructures and rheology of the Earth's upper mantle inferred from a multiscale approach
TypeArticles dans des revues avec comité de lecture
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  to easy  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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Multiscale modeling of upper mantle plasticity: From single-crystal rheology to multiphase aggregate deformation RATERRON, Paul; DETREZ, Fabrice; CASTELNAU, Olivier; BOLLINGER, Caroline; CORDIER, Patrick; MERKEL, Sébastien (ELSEVIER, 2014)We report a first application of an improved second-order (SO) viscoplastic self-consistent model for multiphase aggregates, applied to an olivine + diopside aggregate as analogue for a dry upper mantle peridotite deformed ...
Effective viscoplastic behavior of polycrystalline aggregates lacking four independent slip systems inferred from homogenization methods; application to olivine DETREZ, Fabrice; CASTELNAU, Olivier; CORDIER, Patrick; MERKEL, Sébastien; RATERRON, Paul (ELSEVIER, 2015)Polycrystalline aggregates lacking four independent systems for the glide of dislocations can deform in a purely viscoplastic regime only if additional deformation mechanisms (such as grain boundary sliding and diffusion) ...
BOLLINGER, Caroline; RATERRON, Paul; CASTELNAU, Olivier; DETREZ, Fabrice; MERKEL, Sébastien (Springer Verlag, 2016)We report results from axisymmetric deformation experiments carried out on forsterite aggregates in the deformation-DIA apparatus, at upper mantle pressures and temperatures (3.1–8.1 GPa, 1373–1673 K). We quantified the ...
ROBACH, Odile; KIRCHLECHNER, Christoph; MICHA, Jean Sébastien; ULRICH, M. Olivier; BIQUARD, Xavier; GEAYMOND, M. Olivier; CASTELNAU, Olivier; BORNERT, Michel; PETIT, Johann; BERVEILLER, Sophie; SICARDY, Olivier; VILLANOVA, Julie; RIEUTORD, François (mperial College Press, 2014)This book highlights emerging diffraction studies of strain and dislocation gradients with mesoscale resolution, which is currently a focus of research at laboratories around the world. While ensemble-average diffraction ...
On the Accuracy of Elastic Strain Field Measurements by Laue Microdiffraction and High-Resolution EBSD: a Cross-Validation Experiment PLANCHER, Emeric; PETIT, Johann; MAURICE, Claire; FAVIER, Véronique; SAINTOYANT, Lucie; LOISNARD, Dominique; RUPIN, N.; MARIJON, Jean Baptiste; ULRICH, Olivier; BORNERT, Michel; MICHA, Jean Sébastien; ROBACH, Odile; CASTELNAU, Olivier (Springer New York LLC, 2016)Determining the accuracy of elastic strain measurements in plastically deformed alloys is an experimental challenge. To develop a novel cross-validation procedure, a controlled elasto-plastic strain gradient was created ...