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    Rapid, high-resolution 14C chronology of ooids

    Access Status
    Fulltext not available
    Authors
    Beaupré, S.
    Roberts, M.
    Burton, J.
    Summons, Roger
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Beaupré, S. and Roberts, M. and Burton, J. and Summons, R. 2015. Rapid, high-resolution 14C chronology of ooids. Geochimica et Cosmochimica Acta. 159: pp. 126-138
    Source Title
    Geochimica et Cosmochimica Acta
    DOI
    10.1016/j.gca.2015.03.009
    ISSN
    0016-7037
    URI
    http://hdl.handle.net/20.500.11937/43735
    Collection
    • Curtin Research Publications
    Abstract

    Ooids are small, spherical to ellipsoidal grains composed of concentric layers of CaCO3 that could potentially serve as biogeochemical records of the environments in which they grew. Such records, however, must be placed in the proper temporal context. Therefore, we developed a novel acidification system and employed an accelerator mass spectrometer (AMS) with a gas accepting ion source to obtain radiocarbon (14C) chronologies extending radially through ooids within one 8-h workday. The method was applied to ooids from Highborne Cay, Bahamas and Shark Bay, Australia, yielding reproducible 14C chronologies, as well as constraints on the rates and durations of ooid growth and independent estimates of local 14C reservoir ages.

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