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    Iron cycling in the anoxic cryo-ecosystem of Antarctic Lake Vida

    Access Status
    Fulltext not available
    Authors
    Proemse, B.
    Murray, A.
    Schallenberg, C.
    McKiernan, B.
    Glazer, B.
    Young, S.
    Ostrom, N.
    Bowie, A.
    Wieser, M.
    Kenig, F.
    Doran, P.
    Edwards, Peter
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Proemse, B. and Murray, A. and Schallenberg, C. and McKiernan, B. and Glazer, B. and Young, S. and Ostrom, N. et al. 2017. Iron cycling in the anoxic cryo-ecosystem of Antarctic Lake Vida. Biogeochemistry. 134 (1-2): pp. 17-27.
    Source Title
    Biogeochemistry
    DOI
    10.1007/s10533-017-0346-5
    ISSN
    0168-2563
    School
    Department of Physics and Astronomy
    URI
    http://hdl.handle.net/20.500.11937/58166
    Collection
    • Curtin Research Publications
    Abstract

    © 2017, Springer International Publishing Switzerland. Iron redox cycling in metal-rich, hypersaline, anoxic brines plays a central role in the biogeochemical evolution of life on Earth, and similar brines with the potential to harbor life are thought to exist elsewhere in the solar system. To investigate iron biogeochemical cycling in a terrestrial analog we determined the iron redox chemistry and isotopic signatures in the cryoencapsulated liquid brines found in frozen Lake Vida, East Antarctica. We used both in situ voltammetry and the spectrophotometric ferrozine method to determine iron speciation in Lake Vida brine (LVBr). Our results show that iron speciation in the anoxic LVBr was, unexpectedly, not free Fe(II). Iron isotope analysis revealed highly depleted values of -2.5‰ for the ferric iron of LVBr th at are similar to iron isotopic signatures of Fe(II) produced by dissimilatory iron reduction. The presence of Fe(III) in LVBr therefore indicates dynamic iron redox cycling beyond iron reduction. Furthermore, extremely low d 18 O–SO 4 2- values (-9.7‰) support microbial iron-sulfur cycling reactions. In combination with evidence for chemodenitrification resulting in iron oxidation, we conclude that coupled abiotic and biotic redox reactions are driving the iron cycle in Lake Vida brine. Our findings challenge the current state of knowledge of anoxic brine chemistry and may serve as an analogue for icy brines found in the outer reaches of the solar system.

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