Аннотация:The article presents new data on the ionic, microcomponent and isotopic composition of thermal waters of the Amga group classified as sodium-bicarbonate waters characterized by low mineralization (up to 0.2 g/l), high contents of silica (up to 24 mg/l), lithium, tungsten and molybdenum, and pH = 8.5–9.7. The influence of neotectonics and Quaternary magmatism on the composition and conditions of formation of nitrogen-siliceous thermal waters is shown. Using δD and δ18O values in thermal and background waters, their atmogenic origin was proved, and the source area of mineral waters was identified. The calculated deep reservoir temperature of 77–81°С indicates the formation of resources in the crust at significant depths (as much as 2.5 km). The efficiency of using the multicomponent geothermometry method for low-temperature reservoirs is shown.
