Geochemical and isotopic techniques are applied to evaluate the origin ofsubmarine springs in the southern and northern shoreline in Lebanon. Submarinesprings have different geochemistry reflecting a difference in the specific geology ofsouthern and northern shoreline. Environmental isotopes including 2 H, 18 O, 34 S and18 O in sulfate have proved the different geological features. A more enriched isotopiccomposition of submarine groundwater is investigated in the south where submarinesprings are primarily artesian flows. The deep circulation of groundwater is affectedby a high geothermal gradient. Also a high sulfate content is related to a fractionationin 34 S isotopic composition. This is due to the dissolution of gypsum minerals and itsreduction of marlylimestones of the Upper Cretaceous and Lower Eocene in theconfined aquifers. In the northern part, a slightly depleted isotopic composition is foundfor submarine and groundwater. The highly karstified northern region induces a fastinfiltration of groundwater till its discharge as submarine springs.
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