2006 | OriginalPaper | Buchkapitel
Origin of high 234U/238U ratio in post-permafrost aquifers
verfasst von : Igor Tokarev, A.A. Zubkov, Vyacheslav G. Rumynin, V.A. Polyakov, V.Yu. Kuznetsov, F.E. Maksimov
Erschienen in: Uranium in the Environment
Verlag: Springer Berlin Heidelberg
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Isotope composition and concentration (δ
2
H, δ
18
O,
234
U/
238
U, Ar,
40
Ar/
36
Ar,
3
He/
4
He and
20
Ne/
4
He) were measured in the groundwaters (Tomsk-7). Water has a distinct cold climate isotope signature δ
2
H = −127..−140, δ
18
O = −17.0..−18.2 in contrast of modern meteoric water δ
2
H = −117, δ
18
O = −15.9. Stable isotopes are in concord with noble gas temperature t
NGT
= 0..+4 °C and helium model ages t = 7−14 ka. Disequilibrium uranium
234
U/
238
U up to 16 (activity ratio) obtained and explained of
234
U leaching by the melt water during the permafrost degradation.