3D structure tectonics model of Yenisei site of the Nizhnekansk Massif

Abstract

In 2021, in the Yeniseisky region of the Nizhnekansk Massif in the Krasnoyarsk region, construction of an underground research laboratory (URL) was started to justify safety of high-level radioactive waste disposal. The URL investigations aimed to assess preservation of isolation properties of rock mass exposed to long-active rock pressure, tectonic stresses and heat flow within the whole period of effective radiobiological risk of radioactive waste. Based on the geological data analysis, the structure-and-tectonics model of the Yenisei site was developed, including tectonic faults, lithology, intrusives, as well as heavy fracturing and crushing zones. With no large-scale acquisition of geomechanical data on the Lower Kan Massif, the rock stability was estimated at outcrops on ground surface. The results proved the existing hypotheses of the dynamic impact exerted by the Muratov Fault on the Yenisei site. It was also confirmed that the zone of the dynamic impact of the major faults was less stable than the enclosing rock mass while the rock mass composed of dolerite dykes featured the highest stability.The authors appreciate participation of the researcher from the Nuclear Safety Institute, Russian Academy of Sciences, Candidate of Geological and Mineralogical Sciences O. A. Morozov in this study. This work was conducted in the framework of budgetary funding of the Geophysical Center of RAS, adopted by the Ministry of Science and Higher Education of the Russian Federation.The authors express their gratitude to the students of the NUST MISIS’ College of Mining A. V. Nikitenkova and A. K. Niyaz for the help in processing geological data.