Origin of high 234U/238U ratio in post-permafrost aquifers
作者： Igor Tokarev , A.A. Zubkov , Vyacheslav G. Rumynin , V.A. Polyakov , V.Yu. Kuznetsov
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摘要: Isotope composition and concentration (δ2H, δ18O, 234U/238U, Ar, 40Ar/36Ar, 3He/4He 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 contrast of modern meteoric water −117, −15.9. Stable isotopes are concord with noble gas temperature tNGT 0..+4 °C helium model ages t 7−14 ka. Disequilibrium uranium 234U/238U up to 16 (activity ratio) obtained explained 234U leaching by melt during permafrost degradation.
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