Tracing salinity sources of SAlmadrava karstic brackish spring (Mallorca, Spain) with sulfur and oxygen isotopes
SAlmadrava spring (Mallorca Island) is a good example of a brackish spring in ahighlykarstified coastal carbonate formation. It is located at 6 m.a.s.l. and discharges water of variable salinity, depending on the discharge regime. Its average flow rate is 12.3 hm3/y, and the electric conductivity can reach 40 mS/cm. The phenomenon has been explained as the result of seawater intrusion into the karst system, but discussions still remain on whether this is the unique source of salinity. The objective of this study is to elucidate the role of other possible salinity sources, such as dissolution of Keuper evaporites or fertilizers. The methodology is based on the analysis of concentration, and δ34S and δ18O of dissolved sulfate in a series of samples collected during a high-frequency sampling campaign. Analyses of isotope data show an excellent agreement with a conceptual model of pure mixing of seawater intruding a freshwater aquifer. The influence of other potential sources of salinity, if any, has been estimated to be very limited at any stage of the spring hydrological cycle.
E.Sanz C.Ayora A.Soler
Institute of Earth Sciences Jaume Almera , CSIC, Barcelona, Spain Faculty of Geology, University of Barcelona, Barcelona, Spain
国际会议
第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)
昆明
英文
777-781
2007-07-31（万方平台首次上网日期，不代表论文的发表时间）