UDC 504.43:550.845 (51)
https://doi.org/10.26516/2541-9641.2025.2.124
EDN: ZRWIAJ
S.V. Rasskazov1,2, A.M. Ilyasova1, Yi-Min Sun3, S.V. Snopkov2,4, E.P. Chebykin1,5
1Institute of Earth Crust SB RAS, Irkutsk, Russia
2Irkutsk State University, Irkutsk, Russia
3Institute of Natural Resources and Ecology, Heilongjiang Academy of Sciences, Harbin, China
4Irkutsk National Research Technical University, Irkutsk, Russia
5Limnological Institute SB RAS, Irkutsk, Russia
Abstract. Coordinated variations of U components and Si–Na/Li temperatures in groundwater reservoirs on the southern flank of the South Baikal Basin and the Tunka Valley were recorded that emphasized the unity of a neotectonic structure of the Khamar-Daban range, passing from the southern flank of the Tunka Valley to the one of the South Baikal Basin. On the southern shoulder of the Tunka Valley, in an area of junction between the Khamar-Daban and Urgudey ridges, the Tory-Urgudey-Nilovka boundary belt of groundwater with a high activity ratio of 234U/238U (AR4/8 = 2–3), limiting from the east, south, and west the core of the Tunka geothermal anomaly with low OA4/8 (less than 1.8), was traced. In the time interval from 2012 to 2024, hydrogeochemical signals of groundwater were obtained at the BRS monitoring stations, indicating a widespread transition from the Kultuk seismic reactivation to the Baikal-Khubsugul one in 2014–2015 and the lack of hydrogeochemical changes in some areas during strong earthquakes of the latter reactivation in late 2020 – early 2021. It is suggested that in 2014–2015, comprehensive seismogenic deformations of the BRS earth's crust developed in both its axial part and on the flanks, while the localization of strong deformations in the axial seismogenic structures entailed strong earthquakes of the Baikal-Khubsugul seismic reactivation of 2020–2023. Both flank and distal expansion of the BRS seismicity in 2023–2025 may reflect a seismogenic entry of the earth's crust into a state similar to the one of 2014–2015. The key significance of choosing a monitoring point for assessing the state of the earth's crust is emphasized. For the BRS, complete information is obtained at the axial Kultuk polygon, while on the flanks, the most important pre-seismogenic state of the earth's crust for strong earthquakes is not recorded, and observations are useless.
Keywords: groundwater, uranium, 234U/238U, Cherdyntsev-Chalov effect, geothermometer, earthquake
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Rasskazov Sergei Vasilevich,
doctor of geological and mineralogical sciences, professor,
664025, Irkutsk, st. Lenina, 3,
Irkutsk State University, Faculty of Geology,
Head of Dynamic Geology Char,
664033, Irkutsk, st. Lermontova, 128,
Institute of the Earth's Crust SB RAS,
Head of the Laboratory for Isotopic and Geochronological Studies,
tel.: (3952) 51–16–59,
email: rassk@crust.irk.ru
Ilyasova Aigul Maratovna,
candidate of geological and mineralogical sciences, leading engineer,
664033, Irkutsk, Lermontova st., 128,
Institute of the Earth's Crust SB RAS,
email: ila@crust.irk.ru
Yi-ming Sun,
Researcher,
Institute of Natural Resources and Ecology, Heilongjiang Academy of Sciences, Harbin, China,
email: 894817259@qq.com
Snopkov Sergei Viktorovich,
Candidate of Geological and Mineralogical Sciences,
664025, Irkutsk, Lenin sr., 3,
Irkutsk State University, Faculty of Geology,
Associate Professor,
664074, Irkutsk, Kurchatov st., 3,
Siberian School of Geosciences, Irkutsk National Research Technical University,
Leading Researcher,
email: snopkov_serg@mail.ru.
Chebykin Eugene Pavlovich,
Candidate of Chemical Sciences, Senior Researcher,
664033, Irkutsk, st. Lermontova, 128,
Institute of the Earth's Crust SB RAS,
664033, Irkutsk, st. Ulan-Batorskaya, 3,
Limnological Institute SB RAS,
email: epcheb@yandex.ru
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Article received: 12.06.2025; corrected: 24.06.2025; accepted: 27.06.2025.
FOR CITATION: S.V. Rasskazov, A.M. Ilyasova, Yi-Min Sun, S.V. Snopkov, E.P. Chebykin Variations of U components and Si–Na/Li temperatures in groundwater reservoirs on the southern flank of the South Baikal Basin and Tunka Valley in 2012–2024: relationship between axial and flank seismogenic deformations in the Baikal Rift System // Geology and Environment. 2025. Vol. 5, No. 2. P. 124-149. DOI 10.26516/2541-9641.2025.2.124. EDN: ZRWIAJ
