TY JOUR TI New Data on the Mineral and Geochemical Composition of Bottom Sediments in the Tanatar Soda Lakes (Kulunda Plain, Russia) KW small soda lakes KW bottom sediments KW high-magnesium carbonates KW Ca-excess dolomite KW Tanatar lakes KW Kulunda plain JO Russian Journal of Earth Sciences AU Ovdina, E.A. AU Strakhovenko, V.D. AU Malov, G.I. AU Malov, V.I. AU Solotchina, E.P. PY 2023 IS 23 PB Geophysical Center of the Russian Academy of Sciences