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Deformation of diopside single crystals at mantle pressure. TEM characterization of dislocation microstructures

Elodie Amiguet 1, 2, * Patrick Cordier 1 Paul Raterron 1
* Corresponding author
1 LSPES - Laboratoire de structures et propriétés de l'état solide
2 LST - Laboratoire de Sciences de la Terre
Abstract : The dislocation microstructures of diopside single crystals deformed at high-pressure (4 <= P <= 9 GPa), high-temperature (1100 degrees <= T <= 1400 degrees C) using a Deformation-DIA high-pressure apparatus (D-DIA) have been characterized by transmission electron microscopy using weak-beam dark-field (WBDF), precession electron diffraction (PED), large-angle convergent-beam electron diffraction (LACBED) and the thickness-fringe method. Dislocation glide is the dominant deformation mechanism under these conditions. The 1/2 < 110 >{1 (1) over bar0} glide is controlled by lattice friction on the edge segments and shows extensive cross-slip. The [001] glide occurs mostly on {110}; no evidence for [001](010) glide has been found. The [100] dislocations bear a strong lattice friction probably due to complex (out of glide) core structures
Keywords : upper mantle clinopyroxenes diopside slip systems dislocations TEM LACBED thickness-fringes method
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https://hal-insu.archives-ouvertes.fr/insu-00685181
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Submitted on : Wednesday, April 4, 2012 - 1:57:23 PM
Last modification on : Thursday, October 8, 2020 - 8:40:04 AM

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Elodie Amiguet, Patrick Cordier, Paul Raterron. Deformation of diopside single crystals at mantle pressure. TEM characterization of dislocation microstructures. European Journal of Mineralogy, Copernicus, 2010, 22 (2), pp.181-187. ⟨10.1127/0935-1221/2010/0022-1995⟩. ⟨insu-00685181⟩

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