Atmospheric influence of Earth's earliest sulfur cycle

@article{Farquhar2000AtmosphericIO,
  title={Atmospheric influence of Earth's earliest sulfur cycle},
  author={J. Farquhar and Huiming Bao and Mark H. Thiemens},
  journal={Science},
  year={2000},
  volume={289 5480},
  pages={
          756-9
        },
  url={https://api.semanticscholar.org/CorpusID:12287304}
}
Mass-independent isotopic signatures in Precambrian rocks indicate that a change occurred in the sulfur cycle between 2090 and 2450 million years ago, implying that atmospheric oxygen partial pressures were low and that the roles of oxidative weathering and of microbial oxidation and reduction of sulfur were minimal.
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