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The Soret effect and isotopic fractionation in high-temperature silicate melts

Author

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  • Gerardo Dominguez

    (University of California, San Diego)

  • Gautam Wilkins

    (University of California, Berkeley
    Present address: University of California, San Diego, Department of Chemistry and Biochemistry, California, 92093, USA.)

  • Mark H. Thiemens

    (University of California, San Diego)

Abstract

Diffusion in silicate melts Diffusion in natural condensed phases, such as solutions, geochemical melts and solid–solid interfaces, remains poorly understood at a quantitative level. Dominguez and colleagues present a diffusion model that explains both the chemical and isotopic fractionation of magnesium, calcium and iron in high-temperature geochemical melts. Surprisingly, despite the extreme temperatures involved (above 1,000 °C), they find that consideration of the quantum mechanical zero-point energy of diffusing species is essential for understanding diffusion at the isotopic level. The model explains thermal and chemical mass transport as manifestations of the same underlying diffusion mechanism.

Suggested Citation

  • Gerardo Dominguez & Gautam Wilkins & Mark H. Thiemens, 2011. "The Soret effect and isotopic fractionation in high-temperature silicate melts," Nature, Nature, vol. 473(7345), pages 70-73, May.
    • Handle: RePEc:nat:nature:v:473:y:2011:i:7345:d:10.1038_nature09911
    DOI: 10.1038/nature09911
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