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Transmission electron microscopy characterization of the dislocations and slip systems of the dense hydrous magnesium silicate superhydrous B

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Superhydrous B (shy B) is a dense hydrous magnesium silicate (DHMS) phase, for which experimental studies have indicated a large stability field along cold subduction geotherms in the Earth's transition zone and top region of the lower mantle. The rheological properties of shy B may therefore be relevant to the rheology and possibly the deep seismic characteristics of subduction zones. Samples of shy B have been synthesized and deformed in a multianvil apparatus at 20 GPa and at temperatures 1000–1100 °C. The resulting dislocations have been characterized by transmission electron microscopy (TEM) with the weak-beam dark-field (WBDF) and the large-angle convergent-beam electron diffraction (LACBED) techniques. We emphasize the role of (010) plane in the plasticity of phase shy B. We report that [100] and [001] glide in (010), and also climb of [100]. We also observe <101> glide in (010) and {111} planes under high stress conditions.
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Keywords: CLIMB; DHMS; DISLOCATIONS; GLIDE PLANE; LACBED; SUPERHYDROUS B; TEM

Document Type: Research Article

Publication date: 01 August 2013

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  • The European Journal of Mineralogy publishes original papers, review articles and letters dealing with the mineralogical sciences s.l. These include primarily mineralogy, petrology, geochemistry, crystallography and ore deposits, as well as environmental, applied and technical mineralogy. Nevertheless, papers in any related field, including cultural heritage, will be considered.
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