A.A. KOKOVKIN (ITiG FEB RAS), A.V. IVANOV (SSTU), V.M. TYULENEVA, O.A. YAKUSHINA (VIMS), L.T. RAKOV (IGEM RAS), I.A. YASHKOV (SSTU)

New data on hydrothermal metasomatism in the Cretaceous­-Cenozoic sediments of the Middle Volga right bank

The paper describes the results of studying the hydrothermal processes in Cretaceous­-Cenozoic sediments of the Saratov-­Kamyshin Volga bank, on the Volga abrasion scarp and at its right-­bank area. Three stages are distinguished in the development of hydrothermal systems of the evolutionary structure of the Volga right-­bank area, namely Late Paleocene, Oligocene-­Miocene and Neopleistocene­-Holocene. The features of the substantial composition, and morphology of the corresponding hydrothermal-­metasomatic alterations and the controlling wrench tectonics have been investigated. It is shown the relationship between the Neopleistocene­-Holocene of hydrothermal systems and the seismodislocations developed at the scarp. The field observation results are validated by the mineralogical and laboratory sampling data obtained from the representative observation sites.
Keywords: hydrothermal system, elovution, model, epigenesis, wrench tectonics, seismodislocation.