H 2 O-CO 2 solubility in basanite: Applications to volatile sources and degassing behavior at Erebus volcano, Antarctica Kayla Iacovino 1, Gordon Moore.

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Presentation transcript:

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

Gas-Rich Volcanoes H2OH2O CO 2

Volcanoes in the lab… Vesicular basalt AuPd Capsule Piston Cylinder

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

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

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

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)

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