Anoxygenic photosynthesis modulated Proterozoic oxygen and sustained Earth's middle age.

@article{Johnston2009AnoxygenicPM,
  title={Anoxygenic photosynthesis modulated Proterozoic oxygen and sustained Earth's middle age.},
  author={David T. Johnston and Felisa Wolfe-Simon and Ann Pearson and Andrew H Knoll},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2009},
  volume={106 40},
  pages={16925-9}
}
Molecular oxygen (O(2)) began to accumulate in the atmosphere and surface ocean ca. 2,400 million years ago (Ma), but the persistent oxygenation of water masses throughout the oceans developed much later, perhaps beginning as recently as 580-550 Ma. For much of the intervening interval, moderately oxic surface waters lay above an oxygen minimum zone (OMZ) that tended toward euxinia (anoxic and sulfidic). Here we illustrate how contributions to primary production by anoxygenic photoautotrophs… CONTINUE READING

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