Technical Comments

Response to Comment on “Abiotic Pyrite Formation Produces a Large Fe Isotope Fractionation”

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Science  03 Feb 2012:
Vol. 335, Issue 6068, pp. 538
DOI: 10.1126/science.1213032

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Czaja et al. assert that Guilbaud et al. claim that “the geologic record of Fe isotope fractionation can be explained by abiological precipitation of pyrite.” At no point did we suggest this. We reported a previously underestimated Fe isotope fractionation that contributes to the sedimentary Fe isotope signal.

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