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Abstract Throughout the Mediterranean, salinization threatens water quality, especially in coastal areas. This salinization is the result of concomitant processes related to both seawater intrusion and water–rock interaction, which in some cases are virtually indistinguishable. In the Nurra region of northwestern Sardinia, recent salinization related to marine water intrusion has been caused by aquifer exploitation. However, the geology of this region records a long history from the Palaeozoic to the Quaternary, and is structurally complex and comprises a wide variety of lithologies, including Triassic evaporites. Determining the origin of the saline component of the Jurassic and Triassic aquifers in the Nurra region may provide a useful and more general model for salinization processes in the Mediterranean area, where the occurrence of evaporitic rocks in coastal aquifers is a common feature. In addition, due to intensive human activity and recent climatic change, the Nurra has become vulnerable to desertification and, in common with other Mediterranean islands, surface water resources periodically suffer from severe shortages. With this in mind, we report new data regarding brackish and surface waters (outcrop and lake samples) of the Na-Cl type from the Nurra region, including major ions and selected trace elements (B, Br, I, and Sr), in addition to isotopic data including δ18O, δD in water, and δ34S and δ18O in dissolved SO4. To identify the origin of the salinity more precisely, we also analysed the mineralogical and isotopic composition of Triassic evaporites. The brackish waters have Cl contents of up to 2025 mg L−1 , and the ratios between dissolved ions and Cl, with the exception of the Br / Cl ratio, are not those expected on the basis of simple mixing between rainwater and seawater. The δ18O and δD data indicate that most of the waters fall between the regional meteoric water line and the global meteoric water line, supporting the conclusion that they are meteoric in origin. A significant consequence of the meteoric origin of the Na-Cl-type water studied here is that the Br / Cl ratio, extensively used to assess the origin of salinity in fresh water, should be used with care in carbonate aquifers that are near the coast. Overall, δ34S and δ18O levels in dissolved SO4 suggest that water–rock interaction is responsible for the Na-Cl brackish composition of the water hosted by the Jurassic and Triassic aquifers of the Nurra, and this is consistent with the geology and lithological features of the study area. Evaporite dissolution may also explain the high Cl content, as halite was detected within the gypsum deposits. Finally, these Na-Cl brackish waters are undersaturated with respect to the more soluble salts, implying that in a climate evolving toward semi-arid conditions, the salinization process could intensify dramatically in the near future.
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Call Number THL @ christoph.kuells @ Serial 80
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Author (up) Agoubi*, B.; Kharroubi, A.; Abida, H.
Title Saltwater intrusion modelling in Jorf coastal aquifer, Southeastern Tunisia: geochemical, geoelectrical and geostatistical application Type Journal Article
Year 2013 Publication Hydrol. Process. Abbreviated Journal
Volume 27 Issue Pages 1191-1199
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Call Number CUT @ phaedon.kyriakidis @ Agoubi2013 Serial 139
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Author (up) Ajmera, T.K.; Rastogi, A.K.
Title Artificial Neural Network Application on Estimation of Aquifer Transmissivity Type Journal Article
Year 2008 Publication Journal of Spatial Hydrology Abbreviated Journal
Volume 8 Issue 2 Pages 15-31
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Call Number CUT @ phaedon.kyriakidis @ ajmera2008 Serial 115
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Author (up) Al-Khashman, O.A.
Title Chemical characteristics of rainwater collected at a western site of Jordan Type Journal Article
Year 2009 Publication Atmospheric Research Abbreviated Journal
Volume 91 Issue 1 Pages 53-61
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Publisher Elsevier Place of Publication Editor
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ISSN 0169-8095 ISBN Medium
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Call Number THL @ luqianxue.zhang @ Al-Khashman2009 Serial 59
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Author (up) Al-Omran, A.M.; Aly, A.A.; Al-Wabel, M.I.; Al-Shayaa, M.S.; Sallam, A.S.; Nadeem, M.E.
Title Geostatistical methods in evaluating spatial variability of groundwater quality in Al-Kharj Region, Saudi Arabia Type Journal Article
Year 2017 Publication Appl. Water Sci. Abbreviated Journal
Volume 7 Issue Pages 4013-4023
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Call Number CUT @ phaedon.kyriakidis @ Al-Omran2017 Serial 118
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