MULTI ISOTOPIC AND GEOCHEMICALCONSTRAINTS ON INTERCONNECTION ANDHETEROGENEITIES OF WATER BODIES IN THEADOUR–GARONNE DISTRICT (SW FRANCE)- THE CARISMEAU RESEARCH PROJECTIAEA–CN–151/145

摘要

The main objective of the Water Framework Directive (2000/60/EC) is to preventfurther deterioration and protect and enhance the status of aquatic ecosystems inEurope. The success of the WFD will be mainly measured by the status of water bodies.Aims of the research project Carismeau are to provide further characterization of thegroundwater bodies which have been identifi ed as being of primary importance and/orat risk in the Adour-Garonne district (1/5 of the French territory). For that purpose,combined geochemical analysis (major and trace elements), and isotopes (δ18O and δ2 H,δ34 SSO4 and δ18 OSO4 , strontium, boron, lithium, uranium and lead isotopes) are appliedon one demonstrative water body named the Eocene sands aquifer. Preliminary resultspoint out the extreme heterogeneity of water signatures between the selected waterbodies but also within a single aquifer. The ongoing research will set out to demonstratethe role of lateral variation of facies and the interconnections between aquifers.