Abstract
Deformation experiments using a multianvil apparatus have been performed to investigate the preferred orientation of olivine aggregates at confining pressures of 6GPa and 9GPa, temperature of 1200°C and differential stresses of 80-400MPa. In this study, the lattice preferred orientations are produced by recrystallization (grain boundary migration) driven by dislocation energy. In a compressional stress field, c-axis concentrates on the plane perpendicular to the compressional direction, whereas a- and b-axes rotate with time at high temperature, and then a- and b-axes approach to the direction of an angle of about 45° from the compressional direction. In a tensional stress field, a- and c-axes concentrate on the plane perpendicular to the tensional direction and b-axis concentrates toward the tensional direction. The preferred orientation at the confining pressure of 9GPa is weaker than that observed at confining pressure of 6GPa. The magnitude of the anisotropy on P-wave velocity in most samples are 2-4%, which is nearly equivalent to that observed in the upper mantle.
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Schedule a callMore From: Zisin (Journal of the Seismological Society of Japan. 2nd ser.)
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