Papale model for H2O-CO2 partitioning/solubility in magmas

Calculations specified on this page are performed using the model of:

Papale P, Moretti R, Barbato D (2006) The compositional dependence of the saturation surface of H2O + CO2 fluids in silicate melts. Chemical Geology 229, 78-95.

Enter compositions into the form below or download the Microsoft™ Excel spreadsheet described at the bottom of the page.

Note: If the error message "Could not connect to host" is returned when you attempt to use the calculator, or if the Excel spreadsheet does not execute the calculations properly, the server performing these calculations at OFM Research may be in an unresponsive state. If you encounter this error, please email the webmaster, who will reboot the server to restore functionality.

Choose a calculation mode:

Calculate partitioning of H2O and CO2 between silicate melt and a gas/fluid phase given the weight fraction of H2O and CO2 in the system (magma):

Enter input constraints for calculation:

T (°C)
P (bars)
SiO2 (wt %, anhydrous)
TiO2 (wt %, anhydrous)
Al2O3 (wt %, anhydrous)
Fe2O3 (wt %, anhydrous)
FeO (wt %, anhydrous)
MnO (wt %, anhydrous)
MgO (wt %, anhydrous)
CaO (wt %, anhydrous)
Na2O (wt %, anhydrous)
K2O (wt %, anhydrous)
H2O (wt % in system, liquid+vapor)
CO2 (wt % in system, liquid+vapor)

Calculate the solubility of H2O and CO2 in a silicate melt given the mole fraction of H2O in a coexisting gas/fluid phase.

Enter input constraints for calculation:

T (°C)
P (bars)
SiO2 (wt %, anhydrous)
TiO2 (wt %, anhydrous)
Al2O3 (wt %, anhydrous)
Fe2O3 (wt %, anhydrous)
FeO (wt %, anhydrous)
MnO (wt %, anhydrous)
MgO (wt %, anhydrous)
CaO (wt %, anhydrous)
Na2O (wt %, anhydrous)
K2O (wt %, anhydrous)
H2O (mole fraction in gas/fluid)

Calculate the total pressure and mole fraction of H2O in a gas/fluid phase given the weight fraction of dissolved H2O and CO2 in a coexisting silicate melt.

Enter input constraints for calculation:

T (°C)
SiO2 (wt %, anhydrous)
TiO2 (wt %, anhydrous)
Al2O3 (wt %, anhydrous)
Fe2O3 (wt %, anhydrous)
FeO (wt %, anhydrous)
MnO (wt %, anhydrous)
MgO (wt %, anhydrous)
CaO (wt %, anhydrous)
Na2O (wt %, anhydrous)
K2O (wt %, anhydrous)
H2O (wt % in silicate liquid)
CO2 (wt % in silicate liquid)
H2O (initial guess: wt fraction in system, liquid+vapor)
P (initial guess: bars)

Values for initial guess should be left at defaults unless the function returns an error condition. These numbers are used as a starting point for numerical refinement.

Documentation on web services that support this page.

Microsoft™ Excel Workbook

If you have access to either Microsoft™ Excel for Windows XP (Excel 2002) or Excel 2003, running under Windows 98, ME, NT, XP, 2000, or Windows Server 2003, you may choose to download an Excel workbook that provides a Visual Basic function which calculates results equivalent to the functions provided above. The workbook requires installation of the following optional Excel components:

depending on the version of Excel or Office that is installed. Instructions and a usage example are included in the workbook. Execution of workbook functions requires an active internet connection, as the built-in VBA macros perform their calculations by contacting web services at www.ofm-research.org. Firewall or Windows security settings may interfere with the performance of workbook functions.

Paolo Papale, Melissa Vassalli, and Antonella Longo are gratefully acknowledged for providing computer code that supports these web services.