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    Geobiology of the late Paleoproterozoic Duck Creek Formation, Western Australia

    151497_151497.pdf (4.161Mb)
    Access Status
    Open access
    Authors
    Wilson, J.
    Fischer, W.
    Johnston, D.
    Knoll, A.
    Grotzinger, J.
    Walter, M.
    McNaughton, Neal
    Simon, M.
    Abelson, J.
    Schrag, D.
    Summons, R.
    Allwood, A.
    Andres, M.
    Gammon, C.
    Garvin, J.
    Rashby, S.
    Schweizer, M.
    Watters, W.
    Date
    2010
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Wilson, Jonathan and Fischer, Woodward and Johnston, David and Knoll, Andrew and Grotzinger, John and Walter, M and McNaughton, Neal and Simon, Mel and Abelson, John and Schrag, Daniel and Summons, R and Allwood, Abigail and Andres, Miriam and Gammon, Crystal and Garvin, Jessica and Rashby, Sky and Schweizer, Maia and Watters, Wesley. 2010. Geobiology of the late Paleoproterozoic Duck Creek Formation, Western Australia. Precambrian Research. 179 (1-4): pp. 135-149.
    Source Title
    Precambrian Research
    DOI
    10.1016/j.precamres.2010.02.019
    ISSN
    03019268
    School
    John de Laeter Centre for Mass Spectrometry (COE)
    Remarks

    The link to the journal’s home page is: http://www.elsevier.com/wps/find/journaldescription.cws_home/503357/description#description. Copyright © 2010 Elsevier B.V. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/9396
    Collection
    • Curtin Research Publications
    Abstract

    The ca. 1.8 Ga Duck Creek Formation, Western Australia, preserves 1000 m of carbonates and minor iron formation that accumulated along a late Paleoproterozoic ocean margin. Two upward-deepening stratigraphic packages are preserved, each characterized by peritidal precipitates at the base and iron formation and carbonate turbidites in its upper part. Consistent with recent studies of Neoarchean basins, carbon isotope ratios of Duck Creek carbonates show no evidence for a strong isotopic depth gradient, but carbonate minerals in iron formations can be markedly depleted in C-13. In contrast, oxygen isotopes covary strongly with depth; delta O-18 values as positive as 2%. VPDB in peritidal facies systematically decline to values of 6 to 16% in basinal rocks, reflecting, we posit, the timing of diagenetic closure. The Duck Creek Formation contains microfossils similar to those of the Gunflint Formation, Canada; they are restricted to early diagenetic cherts developed in basinal facies, strengthening the hypothesis that such fossils capture communities driven by iron metabolism. Indeed, X-ray diffraction data indicate that the Duck Creek basin was ferruginous throughout its history. The persistence of ferruginous waters and iron formation deposition in Western Australia for at least several tens of millions of years after the transition to sulfidic conditions in Laurentia suggests that the late Paleoproterozoic expansion of sulfidic subsurface waters was globally asynchronous.

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