Estimation of modern sedimentation rate in Zun-Torei Lake (East Trans-Baikal Region) by 137Cs

On the basis of bottom sediment core dating performed by the technogenic isotope ¹³⁷Cs, the rate of sedimentation in periodically drying Zun-Torei Lake (water area is up to 300 km²) is estimated at 2.88 mm per year over the last 59 years. This value is in agreement with the data of palinological determinations (3.44 mm per year). High sedimentation rates are attributed to intensive evaporite sedimentation and probable eolian addition of terrigenous material.