238U and 235U isotope fractionation upon oxidation of uranium-bearing rocks by fracture waters


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Abstract

The variations in 238U/235U values accompanying mobilization of U by fracture waters from uranium-bearing rocks, in which U occurs as a fine impregnation of oxides and silicates, were studied by the high-precision (±0.07‰) MC–ICP–MS method. Transition of U into the aqueous phase in the oxidized state U(VI) is accompanied by its isotope fractionation with enrichment of dissolved U(VI) in the heavy isotope 238U up to 0.32‰ in relation to the composition of the solid phases. According to the sign, this effect is consistent with the tendency of the behavior of 238U and 235U upon interaction of river waters with rocks of the catchment areas [11] and with the effect observed during oxidation of uraninite by the oxygen-bearing NaHCO3 solution [12].

About the authors

I. V. Chernyshev

Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry

Email: gilyanins@mail.ru
Russian Federation, Staromonetny per. 35, Moscow, 119017

V. N. Golubev

Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry

Author for correspondence.
Email: gilyanins@mail.ru
Russian Federation, Staromonetny per. 35, Moscow, 119017

A. V. Chugaev

Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry

Email: gilyanins@mail.ru
Russian Federation, Staromonetny per. 35, Moscow, 119017

G. V. Mandzhieva

Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry

Email: gilyanins@mail.ru
Russian Federation, Staromonetny per. 35, Moscow, 119017

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