A Petrogenetic Grid for the System $MgO-Al_{2}O_{3}-SiO_{2}$

摘要: A comprehensive analysis of phase relations in the system $MgO-Al_{2}O_{3}-SiO{2}$ (MAS) was carried out using primarily data from equilibrium experiments MAS spinel and garnet peridotite systems. The resulting were extended to whole by maintaining internal consistency other relevant experimental data. Equilibria include cordierite sapphirine, which are usually omitted construction petrogenetic grids. larger number petrologically important equilibria involving these phases appear be stable have not been enumerated previously. produced an internally consistent set thermodynamic parameters that closely agree with measured thermochemical values, although some outstanding discrepancies still remain. result provides a simple practical tool for calculating system, potentially also more complex chemical This is demonstrated with...