VapoRock: Thermodynamics of Vaporized Silicate Melts for Modeling Volcanic Outgassing and Magma Ocean Atmospheres
نویسندگان
چکیده
Abstract Silicate vapors play a key role in planetary evolution, especially dominating early stages of rocky planet formation through outgassed magma ocean atmospheres. Our open-source thermodynamic modeling software “VapoRock” combines the MELTS liquid model with gas-species properties from multiple thermochemistry tables. VapoRock calculates partial pressures 34 gaseous species equilibrium magmatic system Si–Mg–Fe–Al–Ca–Na–K–Ti–Cr–O at desired temperatures and oxygen fugacities ( f O 2 , or pressure ). Comparison experiments shows that melt-oxide activities (which vary over many orders magnitude) are reproduced to within factor ∼3, consistent measurement uncertainties. We also benchmark against wide selection igneous rock compositions including bulk silicate Earth, predicting elemental vapor abundances comparable (Na, Ca, Al) more realistic than (K, Si, Mg, Fe, Ti) those closed-source MAGMA code (with maximum deviations by factors 10–300 for K Si). Vapor depend critically on components. The underpinning was calibrated extensively tested natural liquids. In contrast, MAGMA’s assumes ideal mixtures limited set chemically simplified pseudospecies, which only roughly approximates nonideal compositional interactions typical many-component melts. Finally, we explore how relative SiO provide spectroscopically measurable proxy fugacity devolatilized exoplanetary atmospheres, potentially constraining mantles.
منابع مشابه
Thermodynamic and Transport Properties of Silicate Melts and Magma
This chapter was originally published in the book The Encyclopedia of Volcanoes. The copy attached is provided by Elsevier for the author's benefit and for the benefit of the author's institution, for non-commercial research, and educational use. This includes without limitation use in instruction at your institution, distribution to specific colleagues, and providing a copy to your institution...
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1 School of Environmental Sciences, University of Liverpool, Liverpool, United Kingdom, Geological Sciences, University of Canterbury, Christchurch, New Zealand, 3 Imaging and Medical Beamline, Australian Synchrotron, Clayton, VIC, Australia, 4 Section for Mineralogy, Petrology and Geochemistry, Department of Earth and Environmental Sciences, Ludwig-Maximilian University of Munich, Munich, Germany
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2023
ISSN: ['2041-8213', '2041-8205']
DOI: https://doi.org/10.3847/1538-4357/acbcc7