GEOTHERMAL ZONES OF THE SOUTH OF EAST SIBERIA

The article presents the results of the study of geothermal activity zones in the south of Eastern Siberia. In order to study the deep structure of the Earth’s crust in Transbaikalia, an analysis of the anomalies of the magnetic field and gravity has been carried out. The study of deep sections through the zones of known thermal springs and mud deposits resulted in an assessment of the dependence of the thermal source temperature on the depth of the feed fluid systems. An analysis of the magnetic and density sections of the south of Eastern Siberia revealed deep fluid systems and peculiarities of the hydrothermal potential in the region. Using the models of the magnetization and density distribution, the authors have constructed location schemes for the fluid systems at different depths in the earth’s crust and revealed the ways of the thermofluid flows ascending to the surface. The results of the study showed that ascending migration of fluids with the least heat loss brings hydrothermal waters to the surface through vertical faults that cut the crystalline basement in the depth interval from 2 to 10 km. Based on the analysis of heterogeneity in the deep structure of the basement, a forecast of hydrothermal zones for the south of Eastern Siberia near promising mineral resources has been made.