Osmium evidence for synchronicity between a rise in atmospheric oxygen and Palaeoproterozoic deglaciation

Yasuhito Sekine, Katsuhiko Suzuki, Ryoko Senda, Kosuke T. Goto, Eiichi Tajika, Ryuji Tada, Kazuhisa Goto, Shinji Yamamoto, Naohiko Ohkouchi, Nanako O. Ogawa, Teruyuki Maruoka

    Research output: Contribution to journalArticlepeer-review

    15 Citations (Scopus)

    Abstract

    Early Palaeoproterozoic (2.5ĝ€"2.0 billion years ago) was a critical phase in Earth's history, characterized by multiple severe glaciations and a rise in atmospheric O 2 (the Great Oxidation Event). Although glaciations occurred at the time of O 2 increase, the relationship between climatic and atmospheric transitions remains poorly understood. Here we report high concentrations of the redox-sensitive element Os with high initial 187 Os/ 188 Os values in a sandstoneĝ€"siltstone interval that spans the transition from glacial diamictite to overlying carbonate in the Huronian Supergroup, Canada. Together with the results of Re, Mo and S analyses of the sediments, we suggest that immediately after the second Palaeoproterozoic glaciation, atmospheric O 2 levels became sufficiently high to deliver radiogenic continental Os to shallow-marine environments, indicating the synchronicity of an episode of increasing O 2 and deglaciation. This result supports the hypothesis that climatic recovery from the glaciations acted to accelerate the Great Oxidation Event.

    Original languageEnglish
    Article number502
    JournalNature communications
    Volume2
    Issue number1
    DOIs
    Publication statusPublished - 2011

    ASJC Scopus subject areas

    • Chemistry(all)
    • Biochemistry, Genetics and Molecular Biology(all)
    • Physics and Astronomy(all)

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