Biogeochemistry of manganese in Lake Matano, Indonesia
Issue Date
2011-10-26Author
Jones, C.
Crowe, Sean A.
Sturm, Arne
Leslie, Karla Louise
MacLean, L. C. W.
Katsev, Sergei
Henny, C.
Fowle, David A.
Canfield, D. E.
Publisher
European Geosciences Union
Type
Article
Article Version
Scholarly/refereed, publisher version
Metadata
Show full item recordAbstract
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"
ISSN
1726-4170Collections
- Geology Scholarly Works [247]
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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