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

Content Provider	Springer Nature Link
Author	Abid, Kamel Zouari, Kamel Dulinski, Marek Chkir, Najiba Abidi, Brahim
Copyright Year	2010
Abstract	Water in the fissured limestone and dolomite of the Turonian aquifer of Tunisia has been investigated using geochemical (major ions) and isotopic (δ$^{18}$O, δ$^{2}$H, $^{14}$C) 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.L’eau du réservoir calcaire et dolomitique fissuré de l’Aquifère turonien de Tunisie a été étudié en utilisant des données géochimiques (ions majeurs) et isotopiques (δ$^{18}$O, δ$^{2}$H, $^{14}$C). Pour caractériser le comportement de l’aquifère, 48 échantillons représentatifs ont été collectés en fin de saison humide. L’évolution de la composition chimique de la nappe depuis la zone de recharge jusqu’à la zone de débord est caractérisée par une augmentation du sodium, chlorure et sulfate, suite à la lixiviation d’évaporites. Dans l’étude, trois tendances chimiques distinctes ont été identifiées. Les principales réactions, à l’origine de l’évolution de la nappe dans la zone d’investigation, se répartissent en trois catégories: (1) précipitation de calcite, (2) dissolution du gypse et de la halite, et (3) échange ionique. La composition isotopique stable des échantillons d’eau indique une interaction à large échelle entre le Continental intercalaire et l’Aquifère turonien ainsi que la présence d’un apport local récent qui pénètre probablement le système par failles et/ou fractures.Se investigó el agua en calizas y dolomitas fisuradas del acuífero Turonian de Túnez usando geoquímica (iones mayoritarios) y datos isotópicos (δ$^{18}$O, δ$^{2}$H, $^{14}$C). Para llevar a cabo una caracterización del comportamiento del acuífero, se recolectaron 48 muestras representativas al final de la estación húmeda. La evolución de la composición química del agua subterránea desde las áreas de recarga a las áreas de descarga está caracterizada por un incremento en los contenidos de sodio, cloruro y sulfato como resultado del lixiviado de rocas evaporíticas. En este estudio se identificaron tres tendencias químicas distintas en el agua subterránea. Las reacciones mayores, responsables de la evolución química del agua subterránea en el área investigada, cayeron en tres categorías: (1) precipitación de calcita, (2) disolución de yeso y halita, y (3) intercambio iónico. La composición de isótopos estables de las muestras de agua indicaron interacciones a gran escala entre el Continental Intercalaire y el acuífero Turoniano y la presencia de una componente local joven que probablemente entra al sistema a través de fallas y/o fracturas.لدراسة المياه في الصخور الكلسية والدولوميت المتشققة لطبقة المياه الجوفية التورونيان بتونس استخدمنا التقنيات الكيميائية (الأيونات الرئيسية) ، والنظائرية )أكسيجين- ١٨، دوتريوم، الكربون ١٤ (. و في هذا الإطار تم أخذ ٤٨ عينة مائية من كامل الحوض في أواخر الفصول الممطرة. و لقد بينت نتائج التحاليل أن التركيبة الكيميائية و ملوحة المياه تتغير تدريجيا من مناطق التغذية إلى أسفل الحوض، حيث ترتفع نسبة السوديوم، الكلوريد و الكبريتات نتيجة ذوبان الجبس والهاليت في المياه الجوفية. تم تحديد في هذه الدراسة ثلاثة عناصر أساسية ساهمت في تغيير الخصائص الكيميائية للمياه الجوفية: (١) ترسبات الكالسيت ، (٢) ذوبان الجبس والهاليت، و (٣) التبادل الأيوني. تشير تركيبة النظائر المستقرة لعينات المياه إلى أهمية مياه القاري المتوسطي في تغذية خزان التورونيان و تغذية الموائد المائية بمياه الأمطار عبر الفوالق التكتونية.Foi realizada uma investigação à água dos calcários e dolomitos fracturados do aquífero Turoniano da Tunísia, usando dados geoquímicos (iões principais) e isotópicos (δ$^{18}$O, δ$^{2}$H, $^{14}$C). Para efectuar uma caracterização do comportamento do aquífero, 48 amostras representativas foram colhidas no final da estação húmida. A evolução da composição química das águas subterrâneas de áreas de recarga para as áreas de descarga é caracterizada pelo aumento de teor em sódio, cloreto e sulfato, em resultado da lixiviação de rochas evaporíticas. No estudo, três tendências químicas distintas foram identificadas nas águas subterrâneas. As principais reacções responsáveis pela evolução química das águas subterrâneas na área estudada agrupam-se em três categorias: (1) precipitação de calcite, (2) dissolução de gesso e halite, e (3) troca iónica. A estabilidade da composição isotópica das amostras de água indicam uma interacção a larga escala entre o “Continental Intercalaire” e o aquífero Turoniano, e a presença de uma componente local recente que provavelmente entra no sistema através de falhas e/ou fracturas.
Starting Page	415
Ending Page	427
Page Count	13
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	19
Issue Number	2
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2010-11-11
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Tunisia Precipitation Dissolution Ion exchange Mixing process Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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