Contributions to Mineralogy and Petrology

, Volume 166, Issue 3, pp 845–860 | Cite as

H2O–CO2 solubility in mafic alkaline magma: applications to volatile sources and degassing behavior at Erebus volcano, Antarctica

  • Kayla Iacovino
  • Gordon Moore
  • Kurt Roggensack
  • Clive Oppenheimer
  • Philip Kyle
Original Paper

Abstract

We present new equilibrium mixed-volatile (H2O–CO2) solubility data for a phonotephrite from Erebus volcano, Antarctica. H2O–CO2-saturated experiments were conducted at 400–700 MPa, 1,190 °C, and ~NNO + 1 in non-end-loaded piston cylinders. Equilibrium H2O–CO2 fluid compositions were determined using low-temperature vacuum manometry, and the volatile and major element compositions of the glassy run products were determined by Fourier transform infrared spectroscopy and electron microprobe. Results show that the phonotephrite used in this study will dissolve ~0.8 wt% CO2 at 700 MPa and a fluid composition of \( X_{{{\text{H}}_{ 2} {\text{O}}}} \) ~0.4, in agreement with previous experimental studies on mafic alkaline rocks. Furthermore, the dissolution of CO2 at moderate to high \( X_{{{\text{H}}_{ 2} {\text{O}}}}^{\text{fluid}} \) in our experiments exceeds that predicted using lower-pressure experiments on similar melts from the literature, suggesting a departure from Henrian behavior of volatiles in the melt at pressures above 400 MPa. With these data, we place new constraints on the modeling of Erebus melt inclusion and gas emission data and thus the interpretation of its magma plumbing system and the contributions of primitive magmas to passive and explosive degassing from the Erebus phonolite lava lake.

Keywords

Degassing Alkaline volcanism Volatile solubility Carbon dioxide H2

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Kayla Iacovino
    • 1
    • 3
  • Gordon Moore
    • 2
  • Kurt Roggensack
    • 1
  • Clive Oppenheimer
    • 3
  • Philip Kyle
    • 4
  1. 1.School of Earth and Space ExplorationArizona State UniversityTempeUSA
  2. 2.Department of Earth and Environmental SciencesUniversity of MichiganAnn ArborUSA
  3. 3.Department of GeographyUniversity of CambridgeCambridgeUK
  4. 4.Department of Earth and Environmental ScienceNew Mexico Institute of Mining and TechnologySocorroUSA

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