8th Liquid Matter Conference September 6-10, 2011 Wien, Austria ...

P1.36Fri 911:10-14:00A molecular dynamics simulation study of magmaticliquidsNicolas Sator 11 LPTMC, Université Pierre et Marie Curie (Paris 6), case 121, 4 Place Jussieu, 75005,Paris, FranceThe distribution, recycling and storage of carbon in the Earth are of fundamental importance tounderstand the global carbon cycle. Deep in the mantle, partial melting of silicate and carbonateassemblages may produce a carbon-rich magma. During magma ascent, pressure decreases,carbon dioxide bubbles may form and are eventually released by volcanism. Therefore, a preciseknowledge of how carbon solubility varies during ascent from the source region is mandatory, aprocess for which the effect of pressure remains poorly known. In the long run, it is crucial to betterunderstand the physicochemical properties of silicate melts at the high pressures and temperaturesthat prevail within the Earth’s mantle. We recently developed a simple inter-ionic potential to describesilicate melts of natural compositions. A number of thermodynamic, structural and transportproperties are well reproduced by molecular dynamics simulations. We also studied the dissolutionof carbon dioxide in silicate melts and evaluated the evolution of its solubility with pressure. Theimplication of our results to the degassing of the mantle will be discussed.36