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

Moghadam, Rasoul Hamidzadeh
2009
Univ. Bochum
Monography
Verlagsversion
Englisch
DOI: https://doi.org/10.23689/fidgeo-245
Moghadam, Rasoul Hamidzadeh, 2009: Mechanical behavior of synthetic omphacite aggregates at high temperature and high pressure. Univ. Bochum, 99 S., DOI https://doi.org/10.23689/fidgeo-245.
 
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  • Abstract
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 1175oC, 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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  • Geophysik, Extraterrestische Forschung [405]
Subjects:
Sonstige Verfahren {Geophysik}
Gesteinsdeformation {Strukturgeologie}
Experimentelle Mineralogie
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