Halogen stable isotope studies in formation waters, a comparison between their chlorine and bromine isotope systematics

Eggenkamp, Hans; Agrinier, Pierre; Coleman, Max; Bonifacie, Magali; Ader, Magali; Griffioen, Jasper; Strydom, J.H.; Sterpenich, Jérôme; Gaucher, Éric C.; Louvat, Pascale

doi:10.3997/2214-4609.201803087

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“…Most often, chlorine isotopes (δ 37 Cl) are utilized to distinguish salinity sources, waterrock interactions, and mixing between different waters [16,17]. For example, in the shallow coastal aquifers of the lower Valley of Wadi Medjerda (LVWM), Ferchichi et al [18,19] used geochemical and statistical methods (Principal Components Analysis), to identify the causes and mechanisms of groundwater salinization, while Bouchaou et al [20] and Vespasiano et al [21,22] used different isotopic and geochemical tracers to identify and characterize the main processes causing salinization of groundwater in the coastal aquifer of Souss-Massa (southwest of Morocco) and in the Sibari and Gioia coastal plains (southern Italy), respectively.…”

Section: Introductionmentioning

confidence: 99%

Evidence for Groundwater Salinity Origin Based on Hydrogeochemical and Isotopic (2H, 18O, 37Cl, 3H, 13C, 14C) Approaches: Sousse, Eastern Tunisia

Nefzaoui

Hamouda

Carreira³

et al. 2023

Water

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The key processes responsible for the rise in groundwater salinization in the Mio–Pliocene aquifer system of Sousse (Tunisia, eastern coastline) were identified through a multidisciplinary approach based on the use of geochemical, stable (2H, 13C, 18O and 37Cl) and radioactive (3H and 14C) isotope methods. In the study region, the mineralization of groundwaters is related to water–rock interaction ascribed to the dissolution of minerals in evaporite rocks, as well as to saltwater intrusion. Both processes explain the development of groundwaters in which Cl and Na dominantly determine the groundwater quality deterioration state. The isotopic and geochemical signatures of the studied groundwaters are clearly explained by the (i) occurrence of saline basins (sebkhas adjacent to the study region), (ii) type of rocks found below the ground surface, and (iii) cation exchange between clays and groundwaters.

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