1. Modelling the baseline geochemistry of groundwater in a Chalk aquifer considering solid solutions for carbonate phases
- Author
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Marina Gillon, Jean Aupiais, and Pierre Crançon
- Subjects
Calcite ,geography ,geography.geographical_feature_category ,Geochemistry ,Mineralogy ,Aquifer ,Pollution ,chemistry.chemical_compound ,chemistry ,Geochemistry and Petrology ,Vadose zone ,Environmental Chemistry ,Carbonate rock ,Carbonate ,Sedimentary rock ,Dissolution ,Geology ,Groundwater - Abstract
The Chalk aquifer of Champagne (France) baseline geochemistry has been determined using a solid solution approach for the modelling of calcite dissolution. The water–rock interactions are modelled by the speciation code CHESS from field data and Ca, Mg and Sr aqueous concentrations in groundwater. The stoichiometries of solid solutions are defined in each stratigraphic unit of the Chalk aquifer from bulk geochemistry and Chalk mineralogy of samples taken from boreholes. The initial mineralisation of water at the bottom of the unsaturated zone and the characterisation of the theoretical evolution of groundwater chemistry along the flow lines associated with incongruent calcite dissolution are calculated from this approach.
- Published
- 2010
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