Abstract
Isotope composition and concentration (δ2H, δ18O, 234U/238U, Ar, 40Ar/36Ar, 3He/4He and 20Ne/4He) were measured in the groundwaters (Tomsk-7). Water has a distinct cold climate isotope signature δ2H = −127..−140, δ18O = −17.0..−18.2 in contrast of modern meteoric water δ2H = −117, δ18O = −15.9. Stable isotopes are in concord with noble gas temperature tNGT = 0..+4 °C and helium model ages t = 7−14 ka. Disequilibrium uranium 234U/238U up to 16 (activity ratio) obtained and explained of 234U leaching by the melt water during the permafrost degradation.
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Tokarev, I., Zubkov, A., Rumynin, V.G., Polyakov, V., Kuznetsov, V., Maksimov, F. (2006). Origin of high 234U/238U ratio in post-permafrost aquifers. In: Merkel, B.J., Hasche-Berger, A. (eds) Uranium in the Environment. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-28367-6_88
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DOI: https://doi.org/10.1007/3-540-28367-6_88
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