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Title Type Journal Article
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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 Krige*, D.G.
Title A statistical approach to some basic mine valuation problems on the Witwatersrand Type Journal Article
Year (up) 1951 Publication Jour. Chem. Metall. and Mining Soc. So. Africa Abbreviated Journal
Volume 52 (6) Issue Pages 119-139
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ISSN 0038-223x ISBN Medium
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Notes Approved no
Call Number CUT @ phaedon.kyriakidis @ Krige1951 Serial 157
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Author Matheron*, G.
Title The theory of regionalized variables and its applications Type Book Whole
Year (up) 1971 Publication Abbreviated Journal
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Publisher École national supérieure des mines Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Centre de Morphologie Mathématique Fontainebleau: Les cahiers du Centre de Morphologie Mathématique de Fontainebleau Abbreviated Series Title
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Notes Approved no
Call Number CUT @ phaedon.kyriakidis @ Matheron1971 Serial 158
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Author Journel*, A.G.; Huijbregts, C.J.
Title Mining geostatistics Type Book Whole
Year (up) 1978 Publication Abbreviated Journal
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Publisher Academic Press London ; New York Place of Publication Editor
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ISSN ISBN 0123910501 Medium
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Notes Approved no
Call Number CUT @ phaedon.kyriakidis @ Journel1978 Serial 159
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Author Löhnert, E.P.; Sonntag, C.
Title Grundwasserversalzungen im Raum Hamburg im Licht neuer Isotopendaten Type Journal Article
Year (up) 1981 Publication Zeitschrift der Deutschen Geologischen Gesellschaft Abbreviated Journal
Volume 132 Issue Pages 559-574
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Publisher Schweizerbart Science Publishers Place of Publication Stuttgart, Germany Editor
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Notes Approved no
Call Number THL @ christoph.kuells @ Loehhnert1981 Serial 185
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