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Benchmarking the simulation of Cr isotope fractionation

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Abstract

A benchmark problem set consisting of four problem levels was developed for the simulation of Cr isotope fractionation in 1D and 2D domains. The benchmark is based on a recent field study where Cr(VI) reduction and accompanying Cr isotope fractionation occurs abiotically by an aqueous reaction with dissolved Fe 2+ (Wanner et al., 2012., Appl. Geochem., 27, 644–662). The problem set includes simulation of the major processes affecting the Cr isotopic composition such as the dissolution of various Cr(VI) bearing minerals, fractionation during abiotic aqueous Cr(VI) reduction, and non-fractionating precipitation of Cr(III) as sparingly soluble Cr-hydroxide.

Accuracy of the presented solutions was ensured by running the problems with four well-established reactive transport modeling codes: TOUGHREACT, MIN3P, CRUNCHFLOW, and FLOTRAN. Results were also compared with an analytical Rayleigh-type fractionation model. An additional constraint on the correctness of the results was obtained by comparing output from the problem levels simulating Cr isotope fractionation with the corresponding ones only simulating bulk concentrations. For all problem levels, model to model comparisons showed excellent agreement, suggesting that for the tested geochemical processes any code is capable of accurately simulating the fate of individual Cr isotopes.

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Authors and Affiliations

  1. Earth Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA

    Christoph Wanner & Carl I. Steefel

  2. Department of Geological and Environmental Sciences, Stanford University, Stanford, CA, 94305, USA

    Jennifer L. Druhan

  3. Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario, Canada

    Richard T. Amos

  4. Institute of Geological Sciences, University of Bern, Bern, Switzerland

    Peter Alt-Epping

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  1. Christoph Wanner
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  2. Jennifer L. Druhan
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Correspondence to Christoph Wanner.

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Wanner, C., Druhan, J.L., Amos, R.T. et al. Benchmarking the simulation of Cr isotope fractionation. Comput Geosci 19, 497–521 (2015). https://doi.org/10.1007/s10596-014-9436-9

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