Equation of state for aqueous silica species at pressures from 1 bar to 20 kbar and temperatures from 25° to 900°C based on simulated values of the dielectric constant

Evgeny Wasserman*, Bernard Wood, Alastair Davies

*Corresponding author for this work

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    We have used modified Born theory to extend the Shock-Helgeson-Sverjensky equation of state of aqueous silica to 20 kbar and 900°C. An important requirement of this equation of state is the dielectric constant of the solvent (ε{lunate}), which has been experimentally measured only to 5 kbar and 550°C. Our extension of the Shock-Helgeson-Svetjensky equation relies, therefore, on molecular dynamics simulations which we have previously shown to reproduce the experimental data at densities between 0.25 and 1.0 g cm-3 and temperatures up to 1000°C (pressure ranging from 0.5 to 20 kbar). A combination of recent solubility measurements and of simulated values of e provide the basis for a quantitative description of the thermodynamic properties of aqueous silica over most of the range of geologic interest from 1 bar to 20 kbar and 25-900°C.

    Original languageEnglish
    Pages (from-to)3-9
    Number of pages7
    JournalChemical Geology
    Volume121
    Issue number1-4
    DOIs
    Publication statusPublished - 5 Apr 1995

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