Articles | Volume 13, issue 7
https://doi.org/10.5194/bg-13-2093-2016
https://doi.org/10.5194/bg-13-2093-2016
Research article
 | 
08 Apr 2016
Research article |  | 08 Apr 2016

Environmental control on the occurrence of high-coercivity magnetic minerals and formation of iron sulfides in a 640 ka sediment sequence from Lake Ohrid (Balkans)

Janna Just, Norbert R. Nowaczyk, Leonardo Sagnotti, Alexander Francke, Hendrik Vogel, Jack H. Lacey, and Bernd Wagner

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Cited articles

Baumgarten, H., Wonik, T., Tanner, D. C., Francke, A., Wagner, B., Zanchetta, G., Sulpizio, R., Giaccio, B., and Nomade, S.: Age-depth model of the past 630 kyr for Lake Ohrid (FYROM/Albania) based on cyclostratigraphic analysis of downhole gamma ray data, Biogeosciences, 12, 7453–7465, https://doi.org/10.5194/bg-12-7453-2015, 2015.
Bell, P. E., Mills, A. L., and Herman, J. S.: Biogeochemical Conditions Favoring Magnetite Formation during Anaerobic Iron Reduction, Appl. Environ. Microbiol., 53, 2610–2616, 1987.
Berner, R. A.: A new geochemical classification of sedimentary environments, J. Sediment. Res., 51, 351–369, 1981.
Blakemore, R.: Magnetotactic bacteria, Science, 190, 377–379, 1975.
Blanchet, C., Thouveny, N., and Vidal, L.: Formation and preservation of greigite (Fe3S4) in sediments from the Santa Barbara Basin: Implications for paleoenvironmental changes during the past 35 ka, Paleoceanography, 24, PA2224, https://doi.org/10.1029/2008PA001719, 2009.
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Short summary
The magnetic record from Lake Ohrid reflects a strong change in geochemical conditions in the lake. Before 320 ka glacial sediments contain iron sulfides, while later glacials are dominated by siderite. Superimposed on this large-scale pattern are climatic induced changes in the magnetic mineralogy. Glacial and stadial sediments are characterized by relative increases of high- vs. low-coercivity minerals which relate to enhanced erosion in the catchment, possibly due to a sparse vegetation.
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