Role of the Water–Rock System in the Formation of the CompositionВ of Radon Water of the Tulinskoe Field (Novosibirsk)
D.A. Novikov1,2, A.N. Pyryaev2,4, A.A. Maksimova1,2, V.P. Sukhorukov4, A.S. Derkachev2,В A.F. Sukhorukova1, F.F. Dultsev1, A.V. Chernykh1, A.A. Khvashchevskaya3, N.A. Medeshova5,6
1Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
NovikovDA@ipgg.sbras.ru
2Novosibirsk State University,Novosibirsk, Russia
3Research Laboratory for Hydrogeochemistry of the School of Earth Sciences and Engineering,
Tomsk Polytechnic University, Tomsk, Russia
4V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
5LLP Almaty Hydrogeology, Almaty, Kazakhstan
6Kazakh National Research Technical University, Almaty, Kazakhstan
Keywords: Radon waters, stable isotopes, uranium isotope ratio, uranium, thorium, radium, radon, water–rock system, geochemical type, West Siberia
Pages: 1772—1790
Abstract
We present the first results of comprehensive isotope-geochemical studies of mineral radon waters of the Tulinskoe field (Novosibirsk), aimed at identifying their stages of interaction with the host rocks. By geochemical coefficients Ca/Na, Ca/Mg, Ca/Si, Mg/Si, Na/Si, Si/Na, rNa/rCl, and SO4/Cl, the studied waters are assigned to fracture–vein waters of granitoids. The indices of carbonate mineral saturation of the radon waters show their oversaturation with aragonite, calcite, and dolomite. The waters are also saturated with diaspore, ferrohydrite, gibbsite, and kaolinite, which leads to the deposition of these minerals as secondary phases. In the thermodynamic diagrams, the points of the activities of the radon water components are localized mainly in the stability fields of clay minerals (kaolinite and Na-, Ca-, and Mg-montmorillonites), layered silicates (talc), and zeolites (laumontite). A few points fall in the stability field of silicates (Mg-chlorite). The studied waters of the Tulinskoe field are neutral fresh, with Si = 6.41–9.02 mg/dm3. According to the results of thermodynamic calculations, the radon waters of the Tulinskoe field are in equilibrium with carbonate minerals and hydromicas. Following the classification by S.L. Shvartsev, they are assigned to the Si-Na geochemical type.
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