publication . Article . Other literature type . 2007

A Whiff of Oxygen Before the Great Oxidation Event?

A. D. Anbar; Y. Duan; T. W. Lyons; G. L. Arnold; B. Kendall; R. A. Creaser; A. J. Kaufman; G. W. Gordon; C. Scott; J. Garvin; ...
Restricted English
  • Published: 28 Sep 2007
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 oxidative weathering of crustal sulfide minerals. These findings point to the presence of small amounts of O 2 in the environment more than 50 million years before the st...
free text keywords: Multidisciplinary, Sulfide minerals, Geochronology, Geochemistry, Mineralogy, Paleoatmosphere, Chemostratigraphy, Precambrian, Archean, Geology, Great Oxygenation Event, Rhenium, chemistry.chemical_element, chemistry
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Article . 2007
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Other literature type . 2007
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