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H2O–CO2 solubility in alkali-rich mafic magmas: new experiments at mid-crustal pressures

  • Chelsea M. AllisonEmail author
  • Kurt Roggensack
  • Amanda B. Clarke
Original Paper

Abstract

Volatile solubility in magmas depends on several factors, including composition and pressure. Mafic magmas with high concentrations of alkali elements are capable of dissolving larger quantities of H2O and CO2 than subalkaline basalt, which possibly contributes to large explosive eruptions. Existing volatile solubility models for alkali-rich mafic magmas are well calibrated below ~ 200 MPa, but at greater pressures the experimental data are sparse. To fill in this gap, we conducted a set of mixed H2O–CO2 volatile solubility experiments between 400 and 600 MPa at 1200 °C in six mafic compositions with variable alkali contents (Stromboli, Etna, Vesuvius, Erebus, Sunset Crater, and the San Francisco Volcanic Field). Results from our experiments indicate that existing volatile solubility models for alkali-rich mafic magmas, if extrapolated beyond their calibrated ranges, do not accurately describe CO2 solubility at mid-crustal pressures. We adapt an existing thermodynamic model to reflect our higher-pressure experimental data by determining model parameters \(\Delta {\text{V}}_{r}^{0,m}\) (partial molar volume change of CO2 reaction) and K0 (equilibrium constant) for each studied composition. In these compositions, \(\Delta {\text{V}}_{r}^{0,m}\) is found to vary between ~ 15 and ~ 25 cm3 mol−1, while ln K0 ranges from − 14.9 to − 14.0. The calculated solubility curves show good agreement with CO2 solubility data from the experiments and provide a more accurate description of CO2 solubility than purely empirical fits. These new experiments indicate while CO2 solubility is increased in alkali-rich mafic magmas, it is not simply controlled by total alkali content but rather the full multicomponent magma composition.

Keywords

Volatile solubility Basaltic explosive volcanism Alkali basalts Stromboli Etna Erebus 

Notes

Acknowledgements

This work was supported by the National Science Foundation Grants EAR-1322078 and EAR-1642569. We are grateful to Jake Lowenstern (United States Geological Survey), Ken Domanik (University of Arizona), and Kurt Leinenweber (ASU) for assistance with analytical instruments and other equipment. We gratefully acknowledge the use of facilities at the LeRoy Eyring Center for Solid State Science at ASU. We thank two reviewers and editor Mark Ghiorso for their comments to improve this manuscript.

Supplementary material

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Authors and Affiliations

  1. 1.School of Earth and Space ExplorationArizona State UniversityTempeUSA
  2. 2.Department of Earth and Atmospheric SciencesCornell UniversityIthacaUSA
  3. 3.Istituto Nazionale di Geofisica e VulcanologiaSezione di PisaItaly

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