Paleoenvironmental reconstruction for mineral groundwater area Marcial Waters (Lake Onega catchment)

Abstract

Assessment of the conditions for the formation of Marcial waters was carried out on the basis of complex isotope-geochemical studies of water, peat deposits in the area of mineral water discharge and regional climate paleoreconstruction. The dependence of the chemical composition of water and flow rate of wells on weather and climatic conditions was discovered. Variations in the chemical composition of water do not coincide in time with a change in the flow rate of wells due to the mixing of modern waters of infiltration origin and, possibly, meltwater of permafrost. The evolution of the hydrogeological system of ferrous waters after the retreat of the glacial edge from the northwestern coast of Lake Onega is shown. It is shown that a permanent aquifer was formed at the end of the Preboreal time. The distribution of iron and uranium isotopes in the peat core reflects a change in the redox conditions due to climate change and the participation of meltwater in the groundwater flow.