NDLI: Isotopic evidence to characterize the sources of sulfate ions in the carbonate aquifer system in Aleppo basin (North Syria)

Content Provider	Springer Nature Link
Author	Al Charideh, A.
Copyright Year	2014
Abstract	Sulfur and oxygen isotopic compositions of sulfate (δ$^{34}$S$_{SO4}$, δ$^{18}$O$_{SO4}$) and δ$^{18}$O$_{H2O}$, δ$^{13}$C$_{DIC}$ have been used in conjunction with chemical data to constrain sulfate sources and geochemical processes in carbonate aquifers of the Aleppo basin in north Syria. The Aleppo basin comprises two limestone aquifers: the first one is shallow unconfined of Paleogene age and the second is deep confined of Upper Cretaceous age. The chemical data indicate that dissolution of carbonate and evaporites is the main process controlling groundwater quality. In the mainly unconfined modern groundwater, the wide range of δ$^{34}$S$_{SO4}$ values (10.39–17.6 ‰) indicates a variety of input sources. The likely sources of sulfur include meteoric precipitation and sewage waters which recharge the aquifer through Qweik River crossing the area. These waters have low SO$_{4}$ $^{2−}$ concentration (<50 mg/L), and are associated with heavier value of δ$^{18}$O$_{H2O}$ and high NO$_{3}$ concentration (>20 mg/L). Sulfate increases in deep confined groundwater in some of which gypsum saturation is reached. The δ$^{34}$S$_{SO4}$ and δ$^{18}$O$_{SO4}$ are relatively constant with mean values of 18.5 and 13.5 ‰, respectively. This indicates that gypsum and anhydrite dissolution are the primary sources of sulfate. This water is associated with higher depleted value of δ$^{18}$O$_{H2O}$. The heavier δ$^{13}$C$_{DIC}$ with mean value −1.8 ‰ and high Mg$^{2+}$ concentration (~100 mg/L) in the high sulfate deep groundwater, indicates that the de-dolomitization reactions dominate along flow paths where sulfate concentrations increase.
Starting Page	127
Ending Page	137
Page Count	11
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	73
Issue Number	1
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-06-17
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geochemical Isotopes Sulfate Aleppo basin Syria Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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