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Publication Detail
Biogeochemistry of sapropel from drainless Lake Ochki (Baikal region, Russia)
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Leonova GA, Bobrov VA, Krivonogov SK, Bogush A, Bychinsky VA, Maltzev AE, Anoshin GN
  • Publication date:
    2015
  • Journal:
    Russian Geology and Geophysics
  • Status:
    Accepted
  • Country:
    Russia
  • Language:
    Russian and English
Abstract
Biogeochemistry of organic lake sediments, sapropels, is insufficiently studied in Siberian Region. This paper shows peculiarities in formation of the sapropel chemical composition exampled from Lake Ochki, Transbaikalia, which water has low pH and mineralization. Zoo- and phytoplankton are the main sources of the organic matter and, besides its constitutional chemical elements, they selectively concentrate alkaline, alkaline-earth and chalkophile elements and deposit them. Calculated enrichment factors (EF) show considerable enrichment of the plankton by phosphorous and chalkophile elements. Calculated contribution of the plankton to the sapropel chemical composition (Mebio) shows high values for P (≈100 %), Cd (57), Br (45), Hg (40), Se and Na (30), Zn (23), K (21), and Ca (15). Distribution of elements over the 3.2 m thick sapropel layer is rather even. We suggest that lithophile elements (Al, Sc, Ti, Y, Zr, Nb) and lanthanides have mostly terrigenous sources. High concentrations of labile elements (Cd, Sb, Sn, Pb, Zn) in the upper sapropel layer is probably anthropogenic. Increases of Cu and Zn at certain depths probably reflect inflow of deep ground waters, and Hg, Cd and Sb may reflect forest fires.
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