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Minerals 2018, 8(4), 153; doi:10.3390/min8040153

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

1
CNRS, INRA, ENSCL, UMR 8207-UMET-Unité Matériaux et Transformations, University of Lille, F-59000 Lille, France
2
Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany
3
Department of Earth and Planetary Systems Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
*
Author to whom correspondence should be addressed.
Received: 19 March 2018 / Revised: 7 April 2018 / Accepted: 10 April 2018 / Published: 12 April 2018
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Abstract

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. View Full-Text
Keywords: mantle transition zone; wadsleyite; ringwoodite; plastic deformation; transmission electron microscopy; scanning precession electron diffraction mantle transition zone; wadsleyite; ringwoodite; plastic deformation; transmission electron microscopy; scanning precession electron diffraction
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Nzogang, B.C.; Thilliez, S.; Mussi, A.; Kawazoe, T.; Miyajima, N.; Bouquerel, J.; Cordier, P. Application of Scanning Precession Electron Diffraction in the Transmission Electron Microscope to the Characterization of Deformation in Wadsleyite and Ringwoodite. Minerals 2018, 8, 153.

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