Abstract
The independent elastic constants of an upper mantle mineral, San
Carlos olivine (Mg1.8Fe0.2)SiO4, were measured from 0 to 12.5 gigapascals.
Evidence is offered in support of the proposition that the explicit
temperature dependence of the bulk modulus is small over the range
of temperatures and pressures thought to prevail above the 400-kilometer
discontinuity, and thus the data can be extrapolated to estimate
the properties of olivine under mantle conditions at a depth of 400
kilometers. In the absence of high-temperature data at high pressures,
estimates are made of the properties of olivine under mantle conditions
to a depth of 400 kilometers. In contrast with low-pressure laboratory
data, the predicted covariance of shear and compressional velocities
as a function of temperature nearly matches the seismically estimated
value for the lower mantle.
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