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    Banded iron formation to iron ore: a record of the evolution of Earth environments?

    189525_196581.pdf (720.3Kb)
    Access Status
    Open access
    Authors
    Evans, Katy
    McCuaig, T.
    Leach, D.
    Angerer, T.
    Hagemann, S.
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Evans, K.A. and McCuaig, T.C. and Leach, D. and Angerer, T. and Hagemann, S.G. 2013. Banded iron formation to iron ore: a record of the evolution of Earth environments? Geology. 41 (2): pp. 99-102.
    Source Title
    Geology
    DOI
    10.1130/G33244.1
    ISSN
    0091-7613
    URI
    http://hdl.handle.net/20.500.11937/20126
    Collection
    • Curtin Research Publications
    Abstract

    Banded iron formations (BIF) are the protolith to most of the world’s largest iron ore deposits. Previous hypogene genetic models for Paleoproterozoic “Lake Superior” BIF-hosted deposits invoke upwards, down-temperature flow of basinal brines via complex silica and carbonate precipitation/dissolution processes. Such models are challenged by the necessary SiO2 removal. Thermodynamic and mass balance constraints are used to refine conceptual models of the formation of BIF-hosted iron-ore. These constraints, plus existing isotope and halogen ratio evidence, are consistent with removal of silica by down- or up-directed infiltration of high-pH hypersaline brines, with or without a contribution from basinal brines. The proposed link to surface environments suggest that Paleoproterozoic BIF-ore upgrade may provide a record of a critical time in the evolution of the Earth’s biosphere and hydrosphere.

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