Development of the lakes of the Selenga river delta in the late Holocene

The stages of development of internal lakes and wetlands of the Selenga river delta are considered. The technogenic stage of the formation of the lake-wetland complex was distinguished, replacing the natural one, covering the period of the appearance of relatively ancient internal delta lakes as a result of the planned restructuring of the channel network in the Late Holocene. The phases of water content in the Selenga basin and fluctuations of the baseline level were determined according to data for the period of instrumental observations to assess the causes of the dynamics of the areas of flooded delta areas. The pre-instrumental period of development is considered based on the analysis of limnic deposits of internal lakes and river bank sections of the delta. The zoning of the modern subaerial delta was carried out according to the genetic types of internal lakes, the hypsometric position, and the time of their formation. The results of radiocarbon dating and spore-pollen analysis of bottom sediments of lakes and river bank sections are presented.