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Influence of the former marine conditions on groundwater quality in the neogene phreatic aquifer, Flanders
Coetsiers, M.; Van Camp, M.; Walraevens, K. (2005). Influence of the former marine conditions on groundwater quality in the neogene phreatic aquifer, Flanders, in: Araguás, L. et al. (Ed.) Groundwater and saline intrusion: selected papers from the 18th Salt Water Intrusion Meeting: 18 SWIM, Cartagena (Spain), 31 May to 3 June 2004. Publicaciones del Instituto Geologico y Minero de España. Hidrogeologia y Aguas Subterraneas, 15: pp. 499-509
In: Araguás, L.; Custodio, E.; Manzano, M. (Ed.) (2005). Groundwater and saline intrusion: selected papers from the 18th Salt Water Intrusion Meeting: 18 SWIM, Cartagena (Spain), 31 May to 3 June 2004. Publicaciones del Instituto Geologico y Minero de España. Hidrogeologia y Aguas Subterraneas, 15. Instituto Geologico y Minero de España: Madrid. ISBN 84-7840-588-7. 766 pp., more
In: Publicaciones del Instituto Geologico y Minero de España. Hidrogeologia y Aguas Subterraneas. Instituto Geologico y Minero de España: Madrid, more

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Document type: Conference paper

Author keywords
    hydrogeochemistry, cation exchange, geochemical evolution, Belgium

Authors  Top 
  • Coetsiers, M.
  • Van Camp, M., more
  • Walraevens, K., more

Abstract
    The Neogene Aquifer is situated in the Campine basin in the northeast of Belgium. The groundwater body consists mainly of sands with some clayey intercalations. The Boom Clay forms the lower impermeable boundary of the aquifer. Groundwater flow has been modelled by means of the MODFLOW code. Calculated piezometric levels show good agreement with the observed piezometric heads. The main processes that influence groundwater quality on his way through the aquifer have been studied. The aquifer is well flushed resulting in low amounts of total dissolved solids. In the recharge areas, infiltrating meteoric water mainly influences the chemical composition of groundwater. Pyrite oxidation raises sulphate and iron contents in the top layers. Groundwater mineralisation increases along a flow line, primarily as a result of silicate and calcite dissolution and cation exchange. Large parts of the aquifer are decalcified. Calcareous deposits are present in the deep parts and to the north. The former marine depositional environment has still influence on the present-day groundwater quality. Cation exchange is the most important witness for this marine depositional environment.

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