Sound velocities in olivine at earth mantle pressures

Details Sound velocities in olivine at earth mantle pressures Sound velocities in olivine at earth mantle pressures

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993sci...260.1487z&link_type=abstract

Science (ISSN 0036-8075), vol. 260, no. 5113, p. 1487-1489.

Mathematics

47

Earth Mantle, Elastic Properties, Olivine, Seismology, Acoustic Velocity, Mathematical Models, Pressure Dependence, Temperature Dependence

Scientific paper

The independent elastic constants of an upper mantle mineral, San Carlos olivine (Mg(1.8)Fe(0.2))SiO4, were measured from 0 to 12.5 GPa. 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-km discontinuity, and thus the data can be extrapolated to estimate the properties of olivine under mantle conditions at a depth of 400 km. 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 km. 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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