Hydrologic and geologic factors controlling groundwater geochemistry in the Turonian aquifer (southern Tunisia)

Water in the fissured limestone and dolomite of the Turonian aquifer of Tunisia has been investigated using geochemical (major ions) and isotopic (δ¹⁸O, δ²H, ¹⁴C) data. To carry out a characterization of aquifer behaviour, 48 representative samples were collected at the end of the humid season. The...

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Veröffentlicht in:Hydrogeology journal 2011-03, Vol.19 (2), p.415-427
Hauptverfasser: Abid, Kamel, Zouari, Kamel, Dulinski, Marek, Chkir, Najiba, Abidi, Brahim
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container_issue 2
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creator Abid, Kamel
Zouari, Kamel
Dulinski, Marek
Chkir, Najiba
Abidi, Brahim
description Water in the fissured limestone and dolomite of the Turonian aquifer of Tunisia has been investigated using geochemical (major ions) and isotopic (δ¹⁸O, δ²H, ¹⁴C) data. To carry out a characterization of aquifer behaviour, 48 representative samples were collected at the end of the humid season. The evolution of chemical composition of groundwater from recharge areas to discharge areas is characterized by increasing sodium, chloride and sulphate contents as a result of leaching of evaporite rock. In the study, three distinct chemical trends in groundwater were identified. The major reactions responsible for the chemical evolution of groundwater in the investigated area fall into three categories: (1) calcite precipitation, (2) gypsum and halite dissolution, and (3) ion exchange. The stable isotope composition of water samples indicates large-scale interaction between the Continental Intercalaire and the Turonian aquifer and the presence of a young local component which probably enters the system via faults and/or fractures.
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subjects Aquatic Pollution
Aquifers
Calcite
Categories
Chemical evolution
Chlorides
Dissolution
Dolomite
Earth and Environmental Science
Earth Sciences
Geochemistry
Geology
Geophysics/Geodesy
Groundwater
Groundwater recharge
Gypsum
Hydrogeology
Hydrology
Hydrology/Water Resources
ion exchange
Ions
Leaching
Limestone
Mixing process
precipitation
Rock
Sodium
Stable isotopes
Waste Water Technology
Water analysis
Water Management
Water Pollution Control
Water Quality/Water Pollution
Water sampling
title Hydrologic and geologic factors controlling groundwater geochemistry in the Turonian aquifer (southern Tunisia)
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