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UDC (550.47+549):[(552.5:550.72/.73):551.794](571.14) MINERAL COMPOSITION AND GEOCHEMISTRY OF THE HOLOCENE SECTION SAPROPEL IN MINZELINSKOYE LAKE (NOVOSIBIRSK REGION)
A. E. Maltsev, E. V. Lazareva, G. A. Leonova, V. A. Bobrov, L. V. Miroshnichenko
The chemical and mineral composition of 5 m core in Mizelinskoye Lake, Novosibirsk region is studied. Organo-mineral sediments with high carbonate content (up to 70%) have been formed in the lake during 6,000 years. Macrophytogenic (0–290 cm) and peaty (290–460 cm) types of sapropel can be distinguished in the lake. These types reflect two accumulation stages –at first it was a swamped lowland and later it was transformed into a lake. High carbonate content in sapropel is associated with sedimentation due to chemogenic depositing from solution and biogenic accumulation of aragonite by mollusks and calcite by plants (sapropel-creators). Calcite contains an admixture of Mg and Sr. The biogenic silica is distributed throughout the section in the form of diatom valves and silicified parts of macrophytes and framboidal pyrite throughout the section. Neogenic barite and gypsum are discovered in a peaty sapropel. Increased contents of Zn, Cu и Ag are observed in upper core horizons (0-30 cm). It can be concerned with anthropogenic pollution or microbiological concentration of elements.
Key words: sapropel, mineral composition, biominerals, mineral formation.
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