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    High-precision dating of the Kalkarindji large igneous province, Australia, and synchrony with the Early–Middle Cambrian (Stage 4–5) extinction

    Access Status
    Fulltext not available
    Authors
    Jourdan, Fred
    Hodges, K.
    Sell, B.
    Schaltegger, U.
    Wingate, M.
    Evins, L.
    Söderlund, U.
    Haines, P.
    Phillips, D.
    Blenkinsop, T.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Jourdan, F. and Hodges, K. and Sell, B. and Schaltegger, U. and Wingate, M. and Evins, L. and Söderlund, U. et al. 2014. High-precision dating of the Kalkarindji large igneous province, Australia, and synchrony with the Early–Middle Cambrian (Stage 4–5) extinction. Geology. 42 (6): pp. 543-546.
    Source Title
    Geology
    DOI
    10.1130/G35434.1
    ISSN
    0091-7613
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/15546
    Collection
    • Curtin Research Publications
    Abstract

    The voluminous Kalkarindji flood basalts erupted in Australia during the Cambrian and covered >2 × 106 km2. New U-Pb and 40Ar/39Ar age data from intrusive rocks and lava flows yielded statistically indistinguishable ages at ca. 511 Ma, suggesting a relatively brief emplacement for this province. A zircon age of 510.7 ± 0.6 Ma shows that this province is temporally indistinguishable at the few-hundred-thousand-year level from the Early–Middle Cambrian (Stage 4–5) boundary age of 510 ± 1 Ma, which marks the first severe extinction of the Phanerozoic and an extended marine anoxia period. Sulfur concentration measurements ranging from <50 to 1900 µg/g, and fractal analysis of extensive explosive volcanic breccias, suggest that blasts and phreatomagmatic explosions have contributed to injection of large amounts of sulfur into the stratosphere. In addition, magma intrusions in oil, gas, and sulfate deposits may have generated significant emission of CH4 and SO2 which, along with volcanic gases, would have combined to cause an oscillation of the climate and led to the Cambrian extinction.

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