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    A model for Cryogenian iron formation

    Access Status
    Fulltext not available
    Authors
    Cox, Grant
    Halverson, Galen
    Poirier, A.
    Heron, D.
    Strauss, J.
    Stevenson, R.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Cox, G. and Halverson, G. and Poirier, A. and Heron, D. and Strauss, J. and Stevenson, R. 2016. A model for Cryogenian iron formation. Earth and Planetary Science Letters. 433: pp. 280-292.
    Source Title
    Earth and Planetary Science Letters
    DOI
    10.1016/j.epsl.2015.11.003
    ISSN
    0012-821X
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/47094
    Collection
    • Curtin Research Publications
    Abstract

    The Neoproterozoic Tatonduk (Alaska) and Holowilena (South Australia) iron formations share many characteristics including their broadly coeval (Sturtian) ages, intimate association with glaciogenic sediments, and mineralogy. We show that these shared characteristics extend to their neodymium (εNdεNd) and iron isotope (δ56Fe) systematics. In both regions δ56Fe values display a distinct up-section trend to isotopically heavier values, while εNd values are primitive and similar to non-ferruginous mudstones within these successions. The δ56Fe profiles are consistent with oxidation of ferruginous waters during marine transgression, and the εNd values imply that much of this iron was sourced from the leaching of continental margin sediments largely derived from continental flood basalts. Rare earth element data indicate a secondary hydrothermal source for this iron.

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