Abstract
On the basis of high-pressure-temperature studies of the systems (Mg,Fe)2SiO4, (Mg,Fe)SiO3, and (Mg,Fe)3, Al2Si3O4, it is now well recognized that seismic discontinuity at 400-km depth is due to the olivine-spinel transformation in (Mg,Fe)2SiO4, and that the (Mg,Fe)2SiO4-spinel is one of the most abundant mineral phases in the transition zone (e.g., see Ringwood, 1975; Weidner, 1985; Weidner and Ito, 1987; Bina and Wood, 1987; Katsura and Ito, 1989). An accurate knowledge of the density (ρ) as a function of pressure and temperature of this phase is therefore of paramount importance in realistically modeling the Earth’s transition zone in terms of mineralogical assemblages. The density-pressure relationship for (Mg,Fe)2SiO4-spinels and their structural analogs has been studied quite extensively using ultrasonic interferometry (e.g., see Mizutani et al., 1970; Chung, 1971; Wang and Simmons, 1972; Liebermann, 1975), Brillouin scattering (Weidner et al., 1984), and X-ray diffraction (Mizukami et al., 1975; Mao et al., 1969; Wilburn and Bassett, 1976; Sato, 1977).
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Ming, L.C., Manghnani, M.H., Kim, Y.H., Usha-Devi, S., Xu, JA., Ito, E. (1992). Thermal Expansion Studies of (Mg,Fe)2SiO4-Spinels Using Synchrotron Radiation. In: Saxena, S.K. (eds) Thermodynamic Data. Advances in Physical Geochemistry, vol 10. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-2842-4_12
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