Liquid


Thermodynamic Properties of Silicate Liquids.


  1. Calculate Wt % oxides from mole fractions of endmembers.
  2. Calculate mole fractions of endmembers from Wt % oxides.
  3. Calculate thermodynamic properties from mole fractions of endmembers, T and P.
  4. Calculate oxygen fugacity from Wt % oxides, T and P.
  5. Adjust Fe2O3 and FeO (Wt % oxides) to conform to specified oxygen fugacity, T and P.
SiO2 TiO2 Al2O3 Fe2O3 Cr2O3
Wt % oxides:
FeO MnO MgO NiO CoO
Wt % oxides:
CaO Na2O K2O P2O5 H2O
Wt % oxides:
SiO2 TiO2 Al2O3 Fe2O3 MgCr2O4
Mole Fraction:
Fe2SiO4 MnSi0.5O2 Mg2SiO4 NiSi0.5O2 CoSi0.5O2
Mole Fraction:
CaSiO3 Na2SiO3 KAlSiO4 Ca3(PO4)2 H2O
Mole Fraction:

Calculation of Thermodynamic Properties require specification of temperature (T) and Pressure (P). Recalculation of Fe2O3 and FeO requires additional specification of oxygen fugacity (f O2).

Input a temperature (C): Input a pressure (bars):
f O2 relative to: +/- (log 10):

Action: results or the form.


Ghiorso MS, Sack RO (1995). Chemical mass transfer in magmatic processes IV. A revised and internally consistent thermodynamic model for the interpretation and extrapolation of liquid-solid equilibria in magmatic systems at elevated temperatures and pressures. Contributions to Mineralogy and Petrology 119, 197-212.