Elsevier

Journal of Hydrology

Volume 154, Issues 1–4, February 1994, Pages 301-321
Journal of Hydrology

Research paper
Strontium isotopes as indicators of the dissolving phase in a carbonate aquifer: implications for 14C dating of groundwater

https://doi.org/10.1016/0022-1694(94)90223-2Get rights and content

Abstract

The calculation of model 14C ages for groundwater often relies on a correction being made for the incongruent dissolution of aquifer carbonate. Correction equations are particularly sensitive, in certain ranges, to variation in the δ13C value input for dissolving carbonate. This study uses a combined 87Sr86Sr and δ13C approach to define the source and mean δ13C value of dissolving carbonate in the Lincolnshire Limestone aquifer of eastern England. This δ13C value is most appropriately used in 14C correction equations and yields the most potentially accurate groundwater model ages.

References (42)

  • R.B. Koepnick et al.

    Construction of the Triassic and Jurassic portion of the Phanerozoic curve of seawater 87Sr86Sr

    Chem. Geol. (Isot. Geosci. Sect.)

    (1990)
  • W.G. Mook

    Carbon-14 in hydrogeological studies

  • J.N. Andrews et al.

    Dissolved gases as indicators of groundwater mixing in a Jurassic Limestone aquifer

  • R.G.C. Bathurst

    Carbonate sediments and their diagenesis

    Devel. Sedimentol.

    (1975)
  • P.K. Bishop

    Carbon isotope hydrogeochemistry of the Lincolnshire Limestone formation, England, with special reference to sample preparation and analysis

  • W.H. Burke et al.

    Variation of seawater 87Sr86Sr throughout Phanerozoic time

    Geology

    (1982)
  • R.A. Downing et al.

    The Groundwater Hydrology of the Lincolnshire Limestone with Special Reference to the Groundwater Resources

  • W.M. Edmunds

    Trace element variations across an oxidation-reduction barrier in a limestone aquifer

  • W.M. Edmunds

    Groundwater chemistry — controls and processes

  • W.M. Edmunds et al.

    A comparative study of sequential redox processes in three British aquifers

  • D. Emery

    The diagenesis of the Lincolnshire Limestone (Bajocian) in Lincolnshire

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