Fig. 6: Fe2+-Mg exchange coefficient between Bdm and Fper, \({K}_{{{{\rm{Fe}}}}^{2+}-{{\rm{Mg}}}}^{{{\rm{Bdm}}}-{{\rm{Fper}}}}\).
From: Phase relations of bridgmanite, the most abundant mineral in the Earth’s lower mantle
A With T at 25 GPa. The symbols denote the experimental data. Circles: Nakajima et al.85, square: Frost and Langenhorst84, diamond: Katsura and Ito82. The curves are \({K}_{{{{\rm{Fe}}}}^{2+}-{{\rm{Mg}}}}^{{{\rm{Bdm}}}-{{\rm{Fper}}}}\) of \({\chi }_{{{{\rm{Fe}}}}^{2+}{{{\rm{SiO}}}}_{3}}^{{{\rm{Bdm}}}}\) calculated using the thermodynamic parameters given by Nakajima et al.85. The numbers denote \({\chi }_{{{{\rm{Fe}}}}^{2+}{{{\rm{SiO}}}}_{3}}^{{{\rm{Bdm}}}}\) in mol.%. The colors indicate \({\chi }_{{{{\rm{Fe}}}}^{2+}{{{\rm{SiO}}}}_{3}}^{{{\rm{Bdm}}}}\): red: 4 mol.%, green: 8 mol.%, blue: 12 mol.%, and violet: 16 mol.%. The colours of the symbols also denote \({\chi }_{{{{\rm{Fe}}}}^{2+}{{{\rm{SiO}}}}_{3}}^{{{\rm{Bdm}}}}\). B With P at relatively similar T and bulk compositions. Violet: 1500–1600 K using San Carlos olivine by Kobayashi et al.9, cyan: 2000-2450 K using San Carlos olivine by Auzende et al.88, 1800–2200 K using (Mg0.89Fe0.11)2SiO4 gel by Sinmyo et al.89, green: 1900–2100 K using San Carlos olivine by Sakai et al.10. The cyan and green broken lines showing a negative P dependence are fitting to the data given by Auzende et al.88 and Sakai et al.10.
