A Whiff of Oxygen Before the Great Oxidation Event?

@article{Anbar2007AWO,
  title={A Whiff of Oxygen Before the Great Oxidation Event?},
  author={Ariel D. Anbar and Yun Duan and Timothy W. Lyons and Gail Lee Arnold and Brian Kendall and Robert A. Creaser and Alan J Kaufman and Gwyneth W. Gordon and Clint Scott and Jessica Garvin and Roger Buick},
  journal={Science},
  year={2007},
  volume={317},
  pages={1903 - 1906}
}
High-resolution chemostratigraphy reveals an episode of enrichment of the redox-sensitive transition metals molybdenum and rhenium in the late Archean Mount McRae Shale in Western Australia. Correlations with organic carbon indicate that these metals were derived from contemporaneous seawater. Rhenium/osmium geochronology demonstrates that the enrichment is a primary sedimentary feature dating to 2501 ± 8 million years ago (Ma). Molybdenum and rhenium were probably supplied to Archean oceans by… 

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...

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