https://doi.org/10.26516/2541-9641.2026.2.215

EDN: FTAWLX

Lithium Concentration in Groundwaters of the Tunka Valley: From Host Seismogenic Mylonites to Host Li-Granites with Lithium-Induced ³He Generation

S.V. Rasskazov^1,2, E.P. Chebykin¹, A.M. Ilyasova¹, I.S. Chuvashova^1,2, S.V. Snopkov^2,3

¹Institute of the Earth's Crust SB RAS, Irkutsk, Russia

²Irkutsk State University, Irkutsk, Russia

³ Irkutsk National Research Technical University, Irkutsk, Russia

Abstract. The Li concentration in groundwater from the Tunka Valley varies by five orders of magni-tude. Low Li concentration is characteristic of groundwater from seismogenic mylonites of the Main Sayan Fault, high Li concentration is specific for groundwater from Li-granites. An in-crease in friction temperature from 9 to 116 °C in the low-Li groundwater reservoir of the seismically active fault facilitates exchange reactions of clay minerals and zeolites, increasing Li concentration and decreasing the Na/Li ratio. The temperature dependence of the Na/Li ratio in a high-Li groundwater reservoir from Li-granites is associated with the dissolution of Li (along with Rb) and the removal of Na. It is suggested that neutron bombardment in the high-Li groundwater reservoir provides the generation of ³Не with increasing ³Не/⁴Не to a value of 1.1 × 10⁻⁵, anomalous for crustal groundwater reservoirs.

Keywords: groundwater, hydrogeochemistry, earthquakes, Baikal

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Rasskazov Sergei Vasilevich,

doctor of geological and mineralogical sciences, professor,

664025, Irkutsk, Lenin st., 3,

Irkutsk State University, Faculty of Geology,

Head of Dynamic Geology Char,

664033, Irkutsk, Lermontov str., 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

Chebykin Eugenyi Pavlovich,

Candidate of Chemistry,

664003 Irkutsk, Lermontov st., 128,

Institute of Earth’s crust, SB RAS,

Leading specialist,

tel.: (3952) 51–16–59,

email: cheb@lin.irk.ru

Ilyasova Aigul Maratovna,

candidate of geological and mineralogical sciences,

664033, Irkutsk, Lermontov st., 128,

Institute of the Earth's Crust SB RAS,

leading engineer,

email: ila@crust.irk.ru

Chuvashova Irina Sergeevna,

candidate of geological and mineralogical sciences

664033, Irkutsk, st. Lermontova, 128,

Institute of the Earth's Crust SB RAS,

Senior Researcher,

664025, Irkutsk, st. Lenina, 3,

Irkutsk State University, Faculty of Geology,

Associate Professor of Dynamic Geology Char,

еmail: chuvashova@crust.irk.ru

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.