Subsolidus phase relations in the system MgO-ZnO-SiO2 at high pressure

The subsolidus phase relations were determined experimentally in the system MgO-ZnO-SiO₂ at 1.0 GPa and 1 200°C, by use of the high-pressure apparatus “piston-cylinder”. The results showed characteristics of the phases assemblage different from that in similar ternary systems. It is impossible to form complete Mg₂SiO₄-Zn₂SiO₄ olivine and Mg₂Si₂O₆ Zn₂Si₂O₆ pyroxene solid solution. This is controlled by the properties of Zn²⁺ with an outer layer of electron (Ar)3d¹⁰, different from others transition metal ions, like Fe²⁺, Ni²⁺, Co²⁺.