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UDC (552.14+550.461):[(552.5:550.72/.73):551.794](571.1)
DIAGENETIC TRANSFORMATION OF ORGANO-MINERAL SAPROPEL, BOLSHIYE TOROKI LAKE (WESTERN SIBERIA)
A. E. Maltsev, G. A. Leonova, V. A. Bobrov, V. N. Melenevskii, E. V. Lazareva, S. K. Krivonogov
The 1.8 m Holocene section (6000 years) of bottom sediments within Bolshiye (Big) Toroki Lake is studied. The core lithostratigraphy shows a heterogeneity of the material constitution of sediments, where the following matters are distinguished: sapropel (0-122 cm); peat (122-142 cm); peat mixed with argillaceous material (142-160 cm); underclays (160-180 cm). According to the average content of organic matter (40 %), ash-content (60 %) and CaO (15 %) the upper 1.2 m interval of the lake sediments is referred to organo-mineral calcareous sapropels. The reductive diagenesis type throughout the section is determined on the basis of integrated approach (by compositional changes of pore waters, active sulfate reduction, lowering values of Eh, formation of FeS2 and H2S). The essential mineral in sapropel is Mg-calcite, the presence of framboidal pyrite is found throughout the section. High calcium content in sapropel is an important geochemical feature of the Bolshiye Toroki sediments.
Key words: diagenesis, organic matter, sapropel, peat, macrophytes, biogenic elements, minerals.
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