Dominguez et al. reply

G. Dominguez (), G. Wilkins and M. H. Thiemens
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G. Dominguez: California State University, San Marcos
G. Wilkins: University of California, San Diego
M. H. Thiemens: University of California, San Diego

Nature, 2012, vol. 482, issue 7385, E1-E1

Abstract: Abstract Replying to D. J. Lacks, J. A. Van Orman & C. E. Lesher Nature 482, (2012) Lacks et al.1 argue that our model of isotopic fractionation in thermal gradients in silicate melts2 does not agree with measurements of the ratio of diffusivities seen in silicate melts. This statement is based on an over-interpretation of our model into non-steady-state applications, such as chemical fractionation, because the model we presented treats the quantized energy levels of the transition state as being equal to each other (the partition function Z(TS) = 1). This was warranted, as our main interest was in finding the steady-state solution to isotopic fractionation in a closed system (which is insensitive to the transition state). The potential importance of the transition state in determining the ratios of diffusivities of He isotopes in a geologic system has previously been noted3, and future work will need to clarify the importance of the transition state for kinetic isotopic fractionation in silicate systems, particularly the ratio of diffusivities.

Date: 2012
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DOI: 10.1038/nature10765

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