文章基本信息

标题：USE OF ENVIRONMENTAL ISOTOPES TO EVALUATE THE SOURCES OF SUBMARINE SPRINGS ALONG THE SOUTH COAST OF LEBANON
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作者：Zeinab Saad ; V�ronique Kazpard ; Abdul Rahman Al Charideh 等
期刊名称：Journal of Environmental Hydrology (ältere Jahrgänge)
印刷版ISSN：1058-3912
电子版ISSN：1996-7918
出版年度：2007
卷号：15
出版社：IAEH
摘要：Geochemical and isotopic techniques are applied to evaluate the origin of submarine freshwater along the southern coast of Lebanon and to compare it with the northern coast. Results indicate that submarine springs in the southern and northern coasts have different geochemistries reflecting a difference in the specific geology of the regions. Environmental isotopes including ²H, d¹⁸O, and d³⁴S and d¹⁸O in sulfate have confirmed the different geological conditions. A more enriched isotopic composition of submarine groundwater occurs in the south where submarine springs are primarily artesian flows that occur in confined aquifers. The deep circulation of groundwater is affected by a high geothermal gradient. Also high sulfate content is related to a fractionation in d³⁴S isotopic composition. This is due to the dissolution of gypsum minerals and reduction of the Upper Cretaceous and Lower Eocene marly limestones in the confined aquifers. At the northern coast, a slightly depleted isotopic composition is found for submarine groundwater. The highly karstified northern region allows rapid infiltration of groundwater and discharge as submarine springs. Tritium results for all submarine waters indicate a short subsurface residence time in the aquifers when compared to rainwater in Lebanon.