FEATURES OF REE DISTRIBUTION IN BOTTOM DEPOSITS OF SIBERIAN SMALL LAKES

V. D. Strakhovenko

The work is devoted to studying REE distribution regularities in the components of lake systems with various types of bottom deposits and in depth of bottom deposit core (in a 200-year time interval) of Siberian small lakes. As a result of the conducted researches it is established that the nature of REE distribution among the lake system components (soil-bottom deposit – lake bed rocks) is the same in various lake systems. The REE main carriers in a terrigenous deposit fraction are accessory minerals, field spars, micas. Organogenic or carbonate material admixture reduces REE concentrations in bottom deposits of the lakes. In vertical sections of bottom deposits, rear-earth elements are distributed evenly except for the cores in which a deposit changes its type at a certain depth. Composition change of bottom deposits is noted either by only change of absolute REE concentrations, or by REE trend change within light lanthanides as well.

Key words: geochemistry, bottom deposits, lake systems, rare-earth elements, Siberia.

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