Journal
PHYSICS AND CHEMISTRY OF MINERALS
Volume 41, Issue 7, Pages 537-545Publisher
SPRINGER
DOI: 10.1007/s00269-014-0665-1
Keywords
Olivine; Tomography; Precession; TEM; Dislocation; Glide plane
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Funding
- Marie Curie fellowship [FP7-PEOPLE-20074-3-IRG, 230748-PoEM]
- CNRS (INSU)
- Conseil Regional du Nord Pas de Calais, France
- European Research Council under the Seventh Framework Programme (FP7), ERC [290424-RheoMan]
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A San Carlos olivine polycrystal has been deformed under uppermost mantle conditions, by compression at 900 A degrees C, at a strain rate of 1.1 x 10(-5) s(-1), under a confining pressure of 300 MPa, using the Paterson press. Transmission electron tomography of dislocations has been performed by scanning transmission electron microscopy, by conventional transmission electron microscopy using the weak-beam dark-field technique, associated with precession or not, in order to determine the glide planes of [001] screw dislocations. This recent technique is the most suitable one since most [001] dislocations exhibit straight screw segments due to the high lattice friction on this character at low temperature. We find that [001] dislocations glide in (100), (010) and {110} as already reported, but also more unexpectedly in {120} and {130}. We show that at 900 A degrees C, [001] {110} glide is dominant in polycrystals. We have, however, noted and characterized numerous cross-slip events in the specimen.
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