Application of geological benchmarks for determining groundwater residence time in the aquifer based on uranium isotope data: Evidence from the Severnaya Dvina Basin

Using the Severnaya Dvina Basin as an example, it is shown that information on the distribution of natural U isotopes in aquifers can be applied for practical estimation of the duration of interaction between groundwater and host rocks (age of groundwater). The proposed calculation method includes p...

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Bibliographic Details
Published in:Lithology and Mineral Resources 2013-05, Vol.48 (3), p.254-265
Main Author: Malov, A. I.
Format: Article
Language:English
Subjects:
Aquifers
Benchmarks
Earth and Environmental Science
Earth Sciences
Geochemistry
Groundwater
Hydrology
Isotopes
Mineral Resources
Mineralogy
Rocks
Sedimentology
Uranium
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Summary:Using the Severnaya Dvina Basin as an example, it is shown that information on the distribution of natural U isotopes in aquifers can be applied for practical estimation of the duration of interaction between groundwater and host rocks (age of groundwater). The proposed calculation method includes preliminary determination of the generalized calculated parameter (probability of the transfer of 234 U excess to water) based on geological benchmarks, hydrodynamic calculations, and paleohydrogeological reconstructions. It is assumed that this probability is constant for aquifers composed of homogeneous rocks with certain lithological composition and oxidizing conditions for U. The obtained correlations are valid for a model, where water entering the aquifer lacks U. If it contains such U, the “transport” time, which is equivalent to the timing of respective concentrations and isotopic ratios in the aquifer unit, is determined and estimates of the “water-rock” interaction in the aquifer unit are corrected.
ISSN:0024-4902
1608-3229
1573-8892
DOI:10.1134/S002449021303005X