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

Gerardo Dominguez (), Gautam Wilkins and Mark H. Thiemens
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Gerardo Dominguez: University of California, San Diego
Gautam Wilkins: University of California, Berkeley
Mark H. Thiemens: University of California, San Diego

Nature, 2011, vol. 473, issue 7345, 70-73

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.

Date: 2011
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DOI: 10.1038/nature09911

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