Isotope fractionation by thermal diffusion in silicate melts

Isotopes fractionate in thermal gradients, but there is little quantitative understanding of this effect in complex fluids. Here we present results of experiments and molecular dynamics simulations on silicate melts. We show that isotope fractionation arises from classical mechanical effects, and th...

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Bibliographic Details
Published in:Physical review letters 2012-02, Vol.108 (6), p.065901-065901, Article 065901
Main Authors: Lacks, Daniel J, Goel, Gaurav, Bopp, 4th, Charles J, Van Orman, James A, Lesher, Charles E, Lundstrom, Craig C
Format: Article
Language:English
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Summary:Isotopes fractionate in thermal gradients, but there is little quantitative understanding of this effect in complex fluids. Here we present results of experiments and molecular dynamics simulations on silicate melts. We show that isotope fractionation arises from classical mechanical effects, and that a scaling relation based on Chapman-Enskog theory predicts the behavior seen in complex fluids without arbitrary fitting parameters. The scaling analysis reveals that network forming elements (Si and O) fractionate significantly less than network modifiers (e.g., Mg, Ca, Fe, Sr, Hf, and U).
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.108.065901