Application of Scanning Precession Electron Diffraction in the Transmission Electron Microscope to the Characterization of Deformation in Wadsleyite and Ringwoodite - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Minerals Année : 2018

Application of Scanning Precession Electron Diffraction in the Transmission Electron Microscope to the Characterization of Deformation in Wadsleyite and Ringwoodite

Billy C Nzogang
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Simon Thilliez
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Takaaki Kawazoe
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Nobuyoshi Miyajima
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Résumé

The mantle transition zone represents an important layer in the interior of the Earth that is characterized by phase transformations of olivine polymorphs. Constraining the rheology difference between wadsleyite and ringwoodite is important in determining the viscosity contrast at a depth of 520 km. In this study, we perform a post-mortem by transmission electron microscopy of a wadsleyite + ringwoodite aggregate, deformed at high-pressure and high-temperature, in a deformation-DIA apparatus. From orientation maps acquired by scanning precession electron diffraction, we calculate local misorientations and misorientation-gradients, which are used as a proxy of plastic strain. We show that at 17.3 GPa, 1700 K, the plastic responses of wadsleyite and ringwoodite are comparable, although recovery by subgrain boundary migration is more easily activated in wadsleyite.
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hal-01774968 , version 1 (24-04-2018)

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Billy C Nzogang, Simon Thilliez, Alexandre Mussi, Takaaki Kawazoe, Nobuyoshi Miyajima, et al.. Application of Scanning Precession Electron Diffraction in the Transmission Electron Microscope to the Characterization of Deformation in Wadsleyite and Ringwoodite. Minerals, 2018, 8 (4), pp.1-10. ⟨10.3390/min8040153⟩. ⟨hal-01774968⟩
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