Large-scale fl uctuations in Precambrian atmospheric and oceanic oxygen levels from the record of U in shales

  title={Large-scale fl uctuations in Precambrian atmospheric and oceanic oxygen levels from the record of U in shales},
  author={Camille A Partin and A. Bekker and Noah J. Planavsky and Clinton T. Scott and Ben C Gill and Chen Li and Victor Podkovyrov and Andrey Maslov and Kurt O. Konhauser and Stefan V Lalonde and Gordon D Love and Simon W Poulton and Timothy W. Lyons},
The atmosphere–ocean system experienced a progressive change from anoxic to more oxidizing conditions through time. This oxidation is traditionally envisaged to have occurred as two stepwise increases in atmospheric oxygen at the beginning and end of the Proterozoic Eon. Here, we present a study of the redox-sensitive element, uranium, in organic-rich shales to track the history of Earth's enrichment in organic-rich shales suggest that the initial rise of atmospheric oxygen 2.4 billion yr ago… CONTINUE READING
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