Abstract
The compressional and shear velocities of polycrystalline germanates were measured at room temperature by the ultrasonic pulse transmission method. The values of υp and υs at zero porosity were estimated from these data to be 4.1 and 2.55 km/sec for GeO2 (quartz), 7.9 and 4.85 km/sec for GeO2 (rutile), and 7.4 and 4.4 km/sec for Mg2GeO4 (olivine). These results were used with existing data on silicate compounds to formulate the following empirical relationships of sound velocity, density, and mean atomic weight: υp=(613±36)ρ1.5/m¯2 and υs=(361±23)ρ1.5/m¯2. These relationships are also used to estimate the value of m¯ in the mantle.
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