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87Sr/86Sr ratios as a tracer for spring water origin in the arid sub catchment of Ein Feshkha, NW Dead Sea

Cornelia Wilske1, Christian Siebert1, Tino Rödiger1, Broder Merkel2
1 Helmholtz Centre for Environmental Research (UFZ), Department Catchment Hydrology, Halle, GERMANY
2 Technical University Bergakademie Freiberg, Institute for Geology, Freiberg, GERMANY

P 10.13 in Hydrogeologie arider Gebiete

 

 

Strontium isotope ratios are used to investigate the Mountain Aquifer and its outlet along the NW’ Dead Sea. The aim of the study is to significantly strengthen the knowledge about (i) the multi-aquifer system, (ii) the influence of tectonic framework and (iii) the Graben filling of the Dead Sea Rift and their interaction concerning flow paths evaluation and the origin of discharging groundwater in Ein Feshkha. The Ein Feshkha spring area is the main fresh groundwater outlet along the western Dead Sea coast and is on one hand an ecologically important resort and strategically a reservoir of high importance for the water management. It contains numerous spring outlets and its spring water varies in discharge and particularly in the water chemistry. It is proposed, that the area is connected to both Upper Cretaceous Judean aquifers, the water bearing sediments of the Pleistocene and via faults to the Lower Cretaceous (Kurnub) aquifer. In that context, additionally to major- and minor chemical patterns, 87Sr/86Sr ratios are used as natural tracer of aquifer signatures. In spring waters, Strontium isotope ratios results between the ratios of the Lower and Upper Judea aquifer, indicating a potential groundwater mixing. Additionally the specific rock signature of Strontium isotope ratios is considered to trace the spring water, which corresponds to the aquifer source rock.

Letzte Änderung 02.11.2013