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Science 30 April 1999:
Vol. 284. no. 5415, pp. 782 - 784
DOI: 10.1126/science.284.5415.782
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Reports

Thermal Equation of State of Aluminum-Enriched Silicate Perovskite

Jianzhong Zhang, * Donald J. Weidner

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 MgSiO3 perovskite phase. New pressure-volume-temperature data for silicate perovskite containing 5 mole percent Al2O3 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.

Center for High Pressure Research and Department of Geosciences, State University of New York at Stony Brook, Stony Brook, NY 11794, USA.
*   To whom correspondence should be addressed.

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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R. J. Hemley and H. K. Mao (2002)
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S. Ono, T. Suto, K. Hirose, Y. Kuwayama, T. Komabayashi, and T. Kikegawa (2002)
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