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Article

Isotope Signs (234U/238U, 2H, 18O) of Groundwater: An Investigation of the Existence of Paleo-Permafrost in European Russia (Pre-Volga Region)

1
N. Laverov Federal Center for Integrated Arctic Research of UB RAS, 163000 Arkhangelsk, Russia
2
Research Park, St. Petersburg State University, 198504 St. Petersburg, Russia
3
Northern (Arctic) Federal University, 163002 Arkhangelsk, Russia
*
Author to whom correspondence should be addressed.
Academic Editor: Paolo Madonia
Water 2021, 13(13), 1838; https://doi.org/10.3390/w13131838
Received: 18 May 2021 / Revised: 21 June 2021 / Accepted: 28 June 2021 / Published: 1 July 2021
(This article belongs to the Section Hydrology)
The isotopic (234U/238U, 2H, 18O) and chemical composition of groundwater on the right bank of the Volga River along the middle reach (European Russia) was studied down to a depth of 400 m. These data allow diagnosis of the presence of a three-component mixture. The first component is modern/young fresh recharge water of the Holocene age. It has the isotopic composition of water δ18O → −12.9 ‰ and δ2H → −90 ‰, close to modern precipitations, and the equilibrium isotopic composition of uranium 234U/238U → 1 (by activity). The second component is slightly salted water of the late or postglacial period with δ18O → −17.0 ‰ and δ2H → −119 ‰, and a small excess of uranium-234 234U/238U ≈ 4. The third component is meltwater formed as result of permafrost thawing. It is brackish water with δ18O ≈ −15.0 ‰ and δ2H ≈ −110 ‰, and a maximum excess of uranium-234 234U/238U ≈ 15.7. The salinity of this water is associated with an increase of the SO42−, Ca2+ and Na+ content, and this may be due to the presence of gypsum in water-bearing sediments, because the solubility of sulfates increases at near-zero temperature. We explain the huge excess of uranium-234 by its accumulation in the mineral lattice during the glacial age and quick leaching after thawing of permafrost. View Full-Text
Keywords: groundwater; stable isotopes; uranium-234; permafrost; Pre-Volga groundwater; stable isotopes; uranium-234; permafrost; Pre-Volga
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MDPI and ACS Style

Yakovlev, E.; Tokarev, I.; Zykov, S.; Iglovsky, S.; Ivanchenko, N. Isotope Signs (234U/238U, 2H, 18O) of Groundwater: An Investigation of the Existence of Paleo-Permafrost in European Russia (Pre-Volga Region). Water 2021, 13, 1838. https://doi.org/10.3390/w13131838

AMA Style

Yakovlev E, Tokarev I, Zykov S, Iglovsky S, Ivanchenko N. Isotope Signs (234U/238U, 2H, 18O) of Groundwater: An Investigation of the Existence of Paleo-Permafrost in European Russia (Pre-Volga Region). Water. 2021; 13(13):1838. https://doi.org/10.3390/w13131838

Chicago/Turabian Style

Yakovlev, Evgeny, Igor Tokarev, Sergey Zykov, Stanislav Iglovsky, and Nikolay Ivanchenko. 2021. "Isotope Signs (234U/238U, 2H, 18O) of Groundwater: An Investigation of the Existence of Paleo-Permafrost in European Russia (Pre-Volga Region)" Water 13, no. 13: 1838. https://doi.org/10.3390/w13131838

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