Now showing items 1-3 of 3

    • Influence of sulfate reduction rates on the Phanerozoic sulfur isotope record 

      Leavitt, William Davie; Halevy, Itay; Bradley, Alexander S.; Johnston, David T (Proceedings of the National Academy of Sciences, 2013)
      Phanerozoic levels of atmospheric oxygen relate to the burial histories of organic carbon and pyrite sulfur. The sulfur cycle remains poorly constrained, however, leading to concomitant uncertainties in O2 budgets. Here ...
    • On the mechanisms of sulfur isotope fractionation during microbial sulfate reduction 

      Leavitt, William Davie (2014-06-06)
      Underlying all applications of sulfur isotope analyses is our understanding of isotope systematics. This dissertation tests some fundamental assumptions and assertions, drawn from equilibrium theory and a diverse body of ...
    • Patterns of sulfur isotope fractionation during microbial sulfate reduction 

      Bradley, A. S.; Leavitt, W; Schmidt, M.; Knoll, Andrew Herbert; Girguis, Peter R.; Johnston, David T (Wiley-Blackwell, 2015)
      Studies of microbial sulfate reduction have suggested that the magnitude of sulfur isotope fractionation varies with sulfate concentration. Small apparent sulfur isotope fractionations preserved in Archean rocks have been ...