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Redox-independent chromium isotope fractionation induced by ligand-promoted dissolution

Author

Listed:
  • Emily M. Saad

    (Georgia Institute of Technology)

  • Xiangli Wang

    (Yale University)

  • Noah J. Planavsky

    (Yale University)

  • Christopher T. Reinhard

    (Georgia Institute of Technology)

  • Yuanzhi Tang

    (Georgia Institute of Technology)

Abstract

The chromium (Cr) isotope system has emerged as a potential proxy for tracing the Earth’s atmospheric evolution based on a redox-dependent framework for Cr mobilization and isotope fractionation. Although studies have demonstrated that redox-independent pathways can also mobilize Cr, no quantitative constraints exist on the associated isotope fractionations. Here we survey the effects of common environmental ligands on the dissolution of Cr(III)-(oxy)hydroxide solids and associated Cr isotope fractionation. For a variety of organic acids and siderophores, δ53Cr values of dissolved Cr(III) are −0.27 to 1.23‰, within the range of previously observed Cr isotope signatures in rock records linked to Cr redox cycling. Thus, ligand-promoted dissolution of Cr-containing solids, a redox-independent process, must be taken into account when using sedimentary Cr isotope signatures to diagnose atmospheric oxygen levels. This work provides a step towards establishing a more robust framework for using Cr isotopes to track the evolution of the Earth’s atmosphere.

Suggested Citation

  • Emily M. Saad & Xiangli Wang & Noah J. Planavsky & Christopher T. Reinhard & Yuanzhi Tang, 2017. "Redox-independent chromium isotope fractionation induced by ligand-promoted dissolution," Nature Communications, Nature, vol. 8(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01694-y
    DOI: 10.1038/s41467-017-01694-y
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