Affiliation:
1. Center for High Pressure Research and Department of Geosciences, State University of New York at Stony Brook, Stony Brook, NY 11794, USA.
Abstract
Inferences of the chemical homogeneity of Earth's mantle depend on comparing laboratory-derived equations of state of mantle phases with seismically determined properties of the material in situ. A uniform chemical composition of the entire mantle has been found to be consistent with measurements, to date, of these properties for the end-member MgSiO
3
perovskite phase. New pressure-volume-temperature data for silicate perovskite containing 5 mole percent Al
2
O
3
has yielded different values of the equation of state parameters, with the bulk modulus being significantly smaller at lower mantle conditions than for aluminum-free perovskite, thus requiring adjustments in other components to match seismic observations.
Publisher
American Association for the Advancement of Science (AAAS)
Cited by
121 articles.
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