Abstract—
The paper presents results of modeling the chemical interactions of Quaternary meteoric waters with siltstones of the upper part of the Vendian Padun Formation of the Mezen Syneclise, Arkhangelsk region, Russia. Equilibrium and equilibrium-kinetic approaches were applied. It is shown that under conditions of intensive water exchange and low temperature, due to low rates of interaction of minerals with water, the redox buffer of rock-forming minerals at this stage of the process makes a subordinate contribution to the dissolution of uranium. Therefore, for a sufficiently long time, the main agent of mobilization of uranium in rocks is oxygen dissolved in water.
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Funding
This study was supported by Russian Foundation for Basic Research, project no. 20-05-00045, and the Ministry of Science and Higher Education of the Russian Federation, grant AAAA-A19-119011890018-3. The GECHEQ M database was updated with kinetic constants under government-financed research project for the Laboratory for Modeling Hydrogeochemical and Hydrothermal Processes at Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences.
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Translated by E. Kurdyukov
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Mironenko, M.V., Sidkina, E.S. & Malov, A.I. Equilibrium-Kinetic Modeling of Uranium Behavior in the System Meteoric Groundwater–U-Containing Siltstone at Active Water Exchange. Geochem. Int. 60, 862–868 (2022). https://doi.org/10.1134/S0016702922090038
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DOI: https://doi.org/10.1134/S0016702922090038