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Solubilité du sodium dans les silicates fondus

Abstract : Alkalis in molten silicates have a complex behaviour, changing from lithophile to volatile elements depending on temperature and/or reducing conditions. However, due to the lack of experimental data concerning activity/composition relationships, there is no thermodynamic model available to describe alkali solubility in silicate melts, and their partitioning between melts, minerals and gases. In order to tackle this issue, we have developed a new device for the determination of sodium oxide activity in silicate melts by equilibration of melts with gaseous environment of known Na partial pressure at high temperature and fixed oxygen fugacity (PO2) following: Na(gaz) +1/2 O2(gaz) = Na2O(liq). Using equilibrium data we have establish a model able to predict the sodium solubility and activity in silicate melt belonging CaO-MgO-Al2O3-SiO2 system, at differents PNa and temperatures, as a function of optical basicity, i.e. melt composition. These results have allowed us to determine new type of phase diagram at isoPNa. Finally, this study have to many applications in cosmochemistry, steel and magmatic process
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  • HAL Id : tel-01748765, version 1

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Romain Mathieu. Solubilité du sodium dans les silicates fondus. Autre. Institut National Polytechnique de Lorraine, 2009. Français. ⟨NNT : 2009INPL044N⟩. ⟨tel-01748765⟩

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