Atmospheric oxygenation three billion years ago

@article{Crowe2013AtmosphericOT,
  title={Atmospheric oxygenation three billion years ago},
  author={S. Crowe and L. D{\o}ssing and N. Beukes and M. Bau and S. J. Kruger and R. Frei and D. Canfield},
  journal={Nature},
  year={2013},
  volume={501},
  pages={535-538}
}
It is widely assumed that atmospheric oxygen concentrations remained persistently low (less than 10−5 times present levels) for about the first 2 billion years of Earth’s history. The first long-term oxygenation of the atmosphere is thought to have taken place around 2.3 billion years ago, during the Great Oxidation Event. Geochemical indications of transient atmospheric oxygenation, however, date back to 2.6–2.7 billion years ago. Here we examine the distribution of chromium isotopes and redox… Expand
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