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    A distant magmatic source for Cretaceous karst bauxites of Southern Apennines (Italy), revealed through SHRIMP zircon age dating

    Access Status
    Fulltext not available
    Authors
    Boni, Maria
    Reddy, Steven
    Mondillo, Nicola
    Balassone, Giuseppina
    Taylor, Rich
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Boni, Maria and Reddy, Steven and Mondillo, Nicola and Balassone, Giuseppina and Taylor, Rich. 2012. A distant magmatic source for Cretaceous karst bauxites of Southern Apennines (Italy), revealed through SHRIMP zircon age dating. Terra Nova 24 (4): pp. 326-332.
    Source Title
    Terra Nova
    DOI
    10.1111/j.1365-3121.2012.01068.x
    ISSN
    0954-4879
    URI
    http://hdl.handle.net/20.500.11937/23683
    Collection
    • Curtin Research Publications
    Abstract

    Karst bauxites occur at a Late Cretaceous hiatus on a Bahamian-type platform in Southern Apennines, Italy. In contrast to the well-defined stratigraphic context, their origin remains controversial. Detrital zircon grains preserve textures and Th/U ratios consistent with crystallization from a melt, occasionally around older cores. U-Pb isotopic data, collected using SHRIMP II, record several age populations. The youngest (~90 Ma) falls into the age interval of bauxite formation as defined by stratigraphic criteria. The zircons must therefore be derived from a contemporary Cretaceous volcanic source. The older zircons may be interpreted as xenocrysts associated with the Cretaceous magmas or derived from different sources. Because the bauxite occurs on a isolated carbonate platform, the grains must come from far away sources, most probably transported by wind. The age, palaeogeography and inferred Cretaceous wind pattern are consistent with a prevailing origin from the Dinaric and Carpatho-Balkan orogenic belts, with its Cretaceous bimodal volcanism.

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