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Team TFS
Team TFS
1) Department Geology and Geophysics, Yale University, CT, USA, 2) School of Earth and Atmospheric Sciences, Georgia Institute of Technology, GA, USA. 3Department of Geology, University of Illinois, Champaign, IL, USA, 4) Department of Earth Science, Carleton University, Ottawa, ON, Canada, 5) Centre for Ore Deposit and Exploration Science, University of Tasmania, TAS, Australia, 6) Geological Survey of Canada, Ottawa, ON, Canada, 7) Division of Geological and Planetary Sciences, California, Institute of Technology, Pasadena, CA, USA, 😎 Department of Earth Sciences, University of California, Riverside, CA, USA
Science (2014), V346(6209), pp635-638, doi: 10.1126/science.1258410
Low Mid-Proterozoic atmospheric oxygen levels and the delayed rise of animals
Noah J. Planavsky (1), Christopher T. Reinhard (2), Xiangli Wang (1,3), Danielle Thomson (4), Peter McGoldrick (5), Robert H. Rainbird (6), Thomas Johnson (3), Woodward W. Fischer (7), Timothy W. Lyons (8)
On the basis of chromium (Cr) isotope data from a suite of Proterozoic sediments from China, Australia, and North America, interpreted in the context of data from similar depositional environments from Phanerozoic time, we find evidence for inhibited oxidation of Cr at Earth’s surface in the mid-Proterozoic (1.8 to 0.8 billion years ago). These data suggest that atmospheric O2 levels were at most 0.1% of present atmospheric levels. Direct evidence for such low O2 concentrations in the Proterozoic helps explain the late emergence and diversification of metazoans.
  • Neptune Plus
  • Cr isotopes
  • Atmospheric Oxygen
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