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Mechanical behavior of synthetic omphacite aggregates at high temperature and high pressure

  • Triaxial compression experiments were performed on the synthesized samples and Fe-bearing clinopyroxenite in a solid medium apparatus at a confining pressure of 0.75 to 2.5 GPa, temperatures 900 to 1175\(^{o}\)C, and strain rates between 1.1x10\(^{-6}\) s\(^{-1}\) to 8.5x 10\(^{-5}\) s\(^{-1}\). Samples of calcic compositions deformed at high differential stresses reveal abundant mechanical (100)[001] twins, whereas jadeite aggregates deformed at low differential stress show well developed subgrain boundaries. Combining the mechanical data and observed microstructures for deformed synthetic samples reveal that the deformation of diopside aggregates is controlled by dislocation glide, while the kinetics of dislocation climb controls the deformation of jadeite aggregates. The variation in strength with composition obeys scaling by the dependence of melting temperature and shear modulus on composition. In contrast to climb-controlled deformation, glide-controlled deformation should be insensitive to impurity concentrations.

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Author:Rasoul Hamidzadeh MoghadamGND
Referee:Jörg RennerGND, Claudia A. TrepmannGND
Document Type:Doctoral Thesis
Date of Publication (online):2009/09/21
Date of first Publication:2009/09/21
Publishing Institution:Ruhr-Universität Bochum, Universitätsbibliothek
Granting Institution:Ruhr-Universität Bochum, Fakultät für Geowissenschaften
Date of final exam:2009/07/21
Creating Corporation:Fakultät für Geowissenschaften
GND-Keyword:Rheologie; Kleinwinkel-Korngrenze; Eklogit; Deformationsverhalten; Silicate
Institutes/Facilities:Institut für Geologie, Mineralogie und Geophysik
Dewey Decimal Classification:Naturwissenschaften und Mathematik / Geowissenschaften, Geologie
faculties:Fakultät für Geowissenschaften
Licence (German):License LogoKeine Creative Commons Lizenz - es gelten der Veröffentlichungsvertrag und das deutsche Urheberrecht