Plastic deformation of wadsleyite: II. High-pressure deformation in shear |
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Authors: | E Thurel P Cordier D Frost S-I Karato |
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Institution: | 1.Laboratoire de Structure et Propriétés de l'Etat Solide, UMR CNRS 8008 Université des Sciences et Technologies de Lille, France e-mail: Patrick.Cordier@univ-lille1.fr Tel.: +33 320 43 43 41; Fax: +33 320 43 65 91,FR;2.Bayerisches Geoinstitut, Universit?t Bayreuth, Germany,DE;3.Department of Geology and Geophysics, Yale University, New Haven, USA,US |
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Abstract: | We have studied the dislocation microstructures that develop in (Mg0.9Fe0.1)2SiO4 wadsleyite deformed by simple shear at high pressure. The experiments were performed in a multianvil apparatus with the shear
assembly designed by Karato and Rubie (1997). The samples were synthesized in a separate experiment from high-purity oxides.
The deformation experiments were carried out at 14 GPa and 1300 °C with time durations ranging from 1 to 8 h leading to plastic
shear strains of 60 and 73%, respectively. The microstructures investigated by transmission electron microscopy (TEM) show
that dislocation glide is activated under these conditions over the whole experimental time. The easy slip systems at 1300
°C involve 1/2<111> dislocations gliding in {101} as well as 100] dislocations gliding in (010) and {011}.
Received: 15 July 2002 / Accepted: 14 February 2003
Acknowledgements High-pressure experiments were performed at the Bayerisches Geoinstitut under the EU IHP — Access to Research Infrastructures
Programme (Contract no. HPRI-1999-CT-00004 to D.C. Rubie). The quality of the preparation of the TEM specimens by H. Schultze
is greatly appreciated. |
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Keywords: | Plastic deformation Dislocations Slip systems High pressure TEM |
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