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U-series constraints on aquifer groundwater residence time: the Adour-Garonne district case (southwest France)

Published online by Cambridge University Press:  05 July 2018

C. Innocent  and
P. Négrel
C. Innocent*
Affiliation:
BRGM — MMA/ISO, 3 avenue Claude Guillemin, BP 6009, 45060 Orléans cedex 2, France
P. Négrel
Affiliation:
BRGM — MMA/ISO, 3 avenue Claude Guillemin, BP 6009, 45060 Orléans cedex 2, France
*
*E-mail: [email protected]
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Abstract

U-series were investigated in groundwaters from two water bodies of the Eocene sands aquifer, southwest France. The 234U/238U activity ratios are always larger than the equilibrium value, some waters being highly enriched in 234U (as large as 13.5). In the southern water body, 234U/238U ratios correlate with 14C ages (with one exception). Such U isotopic signatures may allow the evaluation of the residence time of groundwaters within their aquifer using an open-system model based on U activity ratios and concentrations. It is suggested that the ‘oldest’ groundwaters from the southern water body are no older than 38 ky, whereas the maximum ‘age’ of groundwaters from the northern water body, though overall of the same order of magnitude, could be slightly younger (25 ky).

Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 1 , February 2008 , pp. 321 - 324
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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References

André, L. (2002) Contribution of geochemistry to the knowledge of deep groundwater flow. An application to the infra molassic sands aquifer of Aquitanian Basin. PhD Thesis, University of Bordeaux III, 230 pp.Google Scholar
André, L., Franceschi, M., Pouchan, P. and Atteia, O. (2005) Using geochemical data and modelling to enhance the understanding of groundwater flow in a regional deep aquifer, Aquitaine Basin, south-west of France. Journal of Hydrology, 305, 40–62.CrossRefGoogle Scholar
Cowart, J.B. (1980) The relationship of uranium isotopes to oxidation/reduction in the Edwards carbonate aquifer of Texas. Earth and Planetary Science Letters, 48, 277–283.CrossRefGoogle Scholar
Dubar, M., Innocent, C. and Sivan, O. Radiometric dating (U/Th) of the lower marine terrace (Tyrrhenian, MIS 5.5) west of nice (French Riviera). Morphological and neotectonic quantitative implications. Comptes Rendus Geoscience, (sub-mitted).Google Scholar
Hubert, A., Bourdon, B., Pili, E. and Meynadier, L. (2006) Transport of radionuclides in an unconfined chalk aquifer inferred from U-series disequilibria. Geochimica et Cosmochimica Acta, 70, 5437–5454.CrossRefGoogle Scholar
Innocent, C. and Negrel, P. (2007) A U-series study on groundwaters from southwestern France. Abstract 17th Goldschmidt Conference, Cologne, Germany.Google Scholar
Innocent, C. Casanova, J. and Buschaert, S. (2006) Isotopic measurement of ng quantities of Th in natural waters. Coupling 234U/238U and 23OTh/232Th ratios to provide time constraints on the evolution of aquifer groundwaters. Abstract International Symposium, “Aquifers Systems Management”, Dijon, France.Google Scholar
Ivanovitch, M., Frohlich, K. and Hendry, MJ. (1991) Uranium-series radionuclides in fluids and solids, Milk River aquifer, Alberta, Canada. Applied Geochemistry, 6, 405–418.Google Scholar
Kronfeld, J., Vogel, J.C. and Talma, A.S. (1994) A new explanation for extreme 234U/238U disequilibria in a dolomitic aquifer. Earth and Planetary Science Letters, 123, 81–93.CrossRefGoogle Scholar
Meunier, J.D., Bruhlet, J. and Pagel, M. (1992) Uranium mobility in the sediment-hosted uranium deposit of Coutras, France. Applied Geochemistry, 7, 111–121.CrossRefGoogle Scholar
Negrel, Ph., Petelet-Giraud, E., Brenot, A., Millot, R., Roy, S., Dutartre, Ph. and Fournier, I. (2007) Multi isotopic and geochemical constraints on interconnection and heterogeneities of water bodies in the Adour-Garonne district (SW France) — The CARISMEAU research project. Abstract International Symposium on Advances in Isotope Hydrology and its Role in Sustainable Water Resources Management, IAEA, Vienna.Google Scholar
Osmond, J.K. and Cowart, J.B. (1976) The theory and uses of natural uranium isotopic variations in hydrology. Atomic Energy Reviews, 14, 621–679.Google Scholar
Szabo, BJ. (1982) Extreme fractionation of 234U/238U and Th/ U in spring waters, sediments, and fossils at the Pomme de Terre Valley, southwestern Missouri. Geochimica et Cosmochimic. Acta, 46, 1675–1679.CrossRefGoogle Scholar
Tricca, A., Wasserburg, G.J., Porcelli, D. and Baskaran, M. (2001) The transport of U- and Th-series nuclides in a sandy unconfined aquifer. Geochimica et Cosmochimica Acta, 65, 1187–1210.CrossRefGoogle Scholar