Estimation of Accumulation of Chromium Ion Impurities in the CaSiO_3 and MgSiO_3 Phases of the Earth's Lower Mantle at Pressures of 18-25 GPa

摘要

Based on the data of atomic modeling, the different schemes of isomorphic incorporation of Cr3+ ions into the crystal structures of CaSiO3 and MgSiO3 were tested in the pressure range of 18-25 GPa and at temperatures of 1873-2223 K. Under these PT parameters, the content of Cr3+ in these structures was estimated quantitatively. The semi-empirical simulation data are in good agreement with the results of experiments.