Compressional-wave velocities of fayalite, Fe2SiO4 spinel, and coesite

Compressional-wave velocities of fayalite, Fe2SiO4 spinel, α quartz, and coesite were determined by the pulse-transmission method at pressures to 6 kb and room temperature. The compressional-wave velocity at 4 kb of polycrystalline fayalite, Fe2SiO4 olivine, has been found to be 6.7±0.1 km/see, whereas that of polycrystalline Fe2SiO4 spinel is 8.0±0.1 km/sec. The velocity jump at the olivine-spinel transition is 19%, whereas the density jump is 10%. The compressional-wave velocity of (Mg, Fe) 2SiO4 olivine has been found to vary linearly with the FeO/(FeO + MgO) ratio of the samples. The compressional-wave velocity of the spinel polymorph of Mg2SiO4 is estimated to be 10.3 km/sec. The compressional-wave velocities at 4 kb of polycrystalline α quartz and coesite have been found to be 6.2 ±0.1 km/sec and 7.6±0.1 km/sec, respectively.

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