Abstract
The stable isotope of the sulphur atom ( 34 S) and the 18 O of the sulphates (S 18 O 4 ) give information about the type of the mineralisation of the groundwater existing during the water seepage. The decrease of the concentrations in dissolved SO 4 2− (meq/L) versus the increase of δ 18 O (‰ vs. SMOW) of the sulphates (S 18 O 4 2− ) confirms a partial reduction of the dissolved sulphates in the water. The Under-saturated waters versus the gypsum do not cause the precipitations of the sulphates. The study of δ 34 S (‰ CD) vs. Cl − (mg/L) indicates high variations in δ 34 S (‰ CD) for weak difference in the Cl − (mg/L) content, this is due to the reduction of the dissolved sulphates. Concerning the Jurassic water in Lebanon, an oxidation of the sulphide can take place.
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