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    Biogeochemistry of manganese in Lake Matano, Indonesia

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    FowleD_Biogeosciences_8(2)2977.pdf (4.754Mb)
    Issue Date
    2011-10-26
    Author
    Jones, C.
    Crowe, S. A.
    Sturm, Arne
    Leslie, Karla Louise
    MacLean, L. C. W.
    Katsev, S.
    Henny, C.
    Fowle, David A.
    Canfield, D. E.
    Publisher
    European Geosciences Union
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
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    Abstract
    This study explores Mn biogeochemistry in a stratified, ferruginous lake. Intense Mn cycling occurs in the chemocline where Mn is recycled at least 15 times before sedimentation. The kinetics of Mn oxidation in Lake Matano are similar to other studied environments, implying that Mn oxidation is relatively insensitive to environmental parameters and may be controlled by similar mechanisms in diverse settings. The product of biologically catalyzed Mn oxidation in Lake Matano is birnessite. Although there is evidence for abiotic Mn reduction with Fe(II), Mn reduction likely occurs through a variety of pathways. The flux of Fe(II) is insufficient to balance the reduction of Mn at 125 m depth in the water column, and Mn reduction could be a significant contributor to CH4 oxidation. By combining results from synchrotron-based X-ray fluorescence and X-ray spectroscopy, extractions of sinking particles, and reaction transport modeling, we find the kinetics of Mn reduction in the lake's reducing waters are sufficiently rapid to preclude the deposition of Mn oxides from the water column to the sediments underlying anoxic water. Rather, Mn is likely sequestered in these sediments as pseudo kutnahorite. This has strong implications for the interpretation of the sedimentary Mn record.
    Description
    "This is the publisher's version, also available electronically from http://www.biogeosciences-discuss.net"
    URI
    http://hdl.handle.net/1808/16950
    DOI
    https://doi.org/10.5194/bgd-8-4063-2011
    ISSN
    1726-4170
    Collections
    • Geology Scholarly Works [187]
    Citation
    Jones, C., Crowe, S. A., Sturm, A., Leslie, K. L., MacLean, L. C. W., Katsev, S., Henny, C., Fowle, D. A., and Canfield, D. E.: Biogeochemistry of manganese in Lake Matano, Indonesia, Biogeosciences Discuss., 8, 4063-4106, http://www.dx.doi.org/10.5194/bgd-8-4063-2011

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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