Table 1.

Melt composition and calculated volatile–melt solubility parameters

Melt composition
SiO2TiO2Al2O3FeOMgOCaONa2OK2OP2O5H2OCO2Sum
Wt% oxides47.51.9911.718.581.50.350.1711100.93
Mole fractions0.4520.0140.0500.0930.2620.0820.0140.0020.0010.0170.0131.000
Model parameters
Embedded ImageEmbedded ImageEmbedded ImageEmbedded ImageEmbedded ImageEmbedded ImageEmbedded ImageEmbedded ImageEmbedded ImageEmbedded ImageEmbedded ImageEmbedded Image
 0.0170.5170.3550.0160.8050.524−0.482−2.30014739621559676

Calculations follow the model described by Iacono-Marziano et al. (2012) and were done on an anhydrous basis. FeO is assumed equal to total FeO. Embedded Image is the mole fraction of H2O in the melt. Embedded Image is the molar ratio (Al2O3/CaO + Na2O + K2O). Embedded Image and Embedded Image are the respective sums (FeO + MgO) and (Na2O + K2O) as mole fractions. Embedded Image is calculated by consolidating the compositional related to the effect of melt composition on CO2 solubility and regression parameters determined by Iacono-Marziano et al. (2012) so that Embedded Image Embedded Image. Similarly, Embedded Image. Pressure and temperature have units of bars and Kelvins respectively.