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An extensive set of mineralogical, geophysical, and experimental information allows us to establish the physicochemical parameters of phase transitions, the mechanisms and conditions of isomorphism in terms of the major components for the mantle phases. At the same time, our new experimental data provide evidence for importance of study of the behavior of minor elements in the mantle mineral associations and, in particular, in order to establish the host phases accumulating these elements, and to evaluate their influence on the physicochemical parameters of the major mineral reactions in the Earth’s mantle.
Analysis of the model system SiO2–MgO–Cr2O3 allowed us to reveal the petrologically significant sections for experimental study in a wide pressure range (10–24 GPa) at a constant temperature (1600 °C). Experimental study of the simple model systems Maj–Knr and Fo–MChrprovided the fundamentally new data on incorporation of chromium in deep minerals, such as olivine, wadsleyite,...