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In the southern Upper Rhine Valley, groundwater has undergone intensive saline pollution caused by the infiltration of mining brines, a consequence of potash extraction carried out during the 20th century. Major and trace elements along with Sr and U isotopic ratios show that groundwater geochemical characteristics along the saline plumes cannot re...
Contexts in source publication
Context 1
... upper part of the sedimentary filling of the Upper Rhine Graben (Fig. 2) consists mainly of Alpine Quaternary fluviatile deposits (90%) and overlies an impermeable Oligocene marl and clay series (Rupelian). Therefore, it constitutes an alluvial aquifer, which is one of the most important European underground drink- ing water reservoirs (between 40 and 50 billion m 3 between Basel and Karlsruhe). The ...
Context 2
... to the same well sampled in 1998 and 2005. More wells were studied in the second campaign, but fewer sampling depths were chosen for each well. The objective was to sample water from several wells at the same depth of about 30 m downstream of the waste heaps Alex and Rodolphe to follow Regional map of studied area (cross-section is shown in Fig. 2), and (c) blow-up of the studied area scale; the rectangle corresponds to the modelled area (after Noyer and Elsass (2006)). The Cl À contents correspond to the upper 40 m of the aquifer. Alex and Rodolphe are the two waste heaps upstream of the sampled groundwater. Note that C and / correspond to the same well. the water volume ...
Context 3
... a dispersion could be explained by the contribution of a third water end-member, which is impoverished in Na and en- riched in Ca relative to Cl compared to the saline runoff water end-member. Based on Fig. 1 and on the cross-section of the Rhine Graben in the studied area (Fig. 2), several water masses are proposed using a three end-member mixing scenario. First, river waters from the surrounding Vosges Mountains could contribute to the water budget of the alluvial groundwater. Another possibil- ity would be an input of upflowing brines coming from the disso- lution of Eocene diapirs present in this geographical ...
