Rapid, high-resolution 14C chronology of ooids

Steven R. Beaupré*, Mark L. Roberts, Joshua R. Burton, Roger E. Summons

*Corresponding author for this work

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    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.

    Original languageEnglish
    Pages (from-to)126-138
    Number of pages13
    JournalGeochimica et Cosmochimica Acta
    Volume159
    DOIs
    Publication statusPublished - 2015

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