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Kayla Iacovino 1 , Gordon Moore 1 , Kurt Roggensack 1 , Clive Oppenheimer 2 , Philip Kyle 3

H 2 O-CO 2 solubility in basanite: Applications to volatile sources and degassing behavior at Erebus volcano, Antarctica. Kayla Iacovino 1 , Gordon Moore 1 , Kurt Roggensack 1 , Clive Oppenheimer 2 , Philip Kyle 3 1 Arizona State University, 2 University of Cambridge, 3 New Mexico Tech.

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Kayla Iacovino 1 , Gordon Moore 1 , Kurt Roggensack 1 , Clive Oppenheimer 2 , Philip Kyle 3

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  1. H2O-CO2 solubility in basanite: Applications to volatile sources and degassing behavior at Erebus volcano, Antarctica Kayla Iacovino1, Gordon Moore1, Kurt Roggensack1, Clive Oppenheimer2, Philip Kyle3 1Arizona State University, 2University of Cambridge, 3New Mexico Tech

  2. Gas-Rich Volcanoes H2O CO2

  3. Volcanoes in the lab… Vesicular basalt Piston Cylinder AuPd Capsule

  4. Mt. Erebus • Active volcano with convecting lava lakes • Explosive eruptions with copious amounts of volatiles (CO2, H2O, SO2, HCl) observed by Oppenheimer et al (2008, 2009) • Sequence of lavas from primitive basanite to currently erupting phonolite (Kyle, 1981) NASA/JPL remotely sensed image

  5. Observations of Explosive Eruptions • Bursting of magma bubble is associated with sudden spike in heat and change in gas composition due to arrival of hot magma Data from Calkins et al, 2008

  6. Interpretation • Addition of new packets of hot basanite magma explains observed gas composition and heat flux changes at lava lake How Deep? Previous estimates from modeling suggest pressures of 400 MPa (or about 12 km deep) Oppenheimer et al., Earth and Planetary Sci. Lett. 284 (2009) 392-398

  7. Our Experimental Results • Experiments have similar gas composition to that measured in Erebus basanites • Neither model reproduces our data • Estimated pressure for Erebus ≈ 600MPa (or about 18km deep)

  8. Conclusions • Current models do no reproduce experimental data well • Comparison of experimental data to data from natural Erebus samples indicates a pressure of about 600MPa for Mt. Erebus basanite Implications for Erebus: Degassing of gas-rich basanite occurs deeper than previously thought Acknowledgements Amber Gullikson, Erika Beam, ASU/NASA Space Grant Program

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