Thermodynamic mixing properties and behavior of almandine-spessartine solid solutions

The relevance of the new garnet Fe-Mn mixing model for petrological calculations is demonstrated by incorporating it into the quaternary garnet mixing model of Berman (1990). Thus, better agreement for temperatures calculated using Fe-Mn garnet-ilmenite and Fe-Mg garnet-biotite geothermometry could be achieved. Temperatures calculated for Mn-poor and Mn-rich garnet-bearing assemblages, applying garnet-biotite thermometry, are in better agreement taking Fe-Mn mixing into account.