Selected Elastic Moduli of Single-Crystal Olivines from Ultrasonic Experiments to Mantle Pressures

Abstract

Ultrasonic interferometric measurements, developed for polycrystalline samples in a multi-anvil apparatus, were extended to single-crystal samples of San Carlos olivine and forsterite. The elastic moduli, C₂₂ and C₅₅ of San Carlos olivine and C₅₅ of pure forsterite, were measured to about 13 gigapascals. These data on C₂₂ for San Carlos olivine and C₅₅ for forsterite are consistent with earlier measurements and extrapolations. The C₅₅ for San Carlos olivine increases linearly as a function of increasing pressure, unlike the earlier nonlinear behavior observed at high pressure with impulsive stimulated scattering techniques.