NDLI: Hydrogeochemical and isotope geochemical study of northwestern Algerian thermal waters

Content Provider	Springer Nature Link
Author	Belhai, Mohamed Fujimitsu, Yasuhiro Bouchareb Haouchine, Fatima Zohra Iwanaga, Tatsuto Noto, Masami Nishijima, Jun
Copyright Year	2016
Abstract	Northwestern Algeria is characterized by a large number of thermal waters and volcanic eruptions and belongs to the Alpine-Magrebide belt. The geothermal reservoirs that feed these reservoirs are mainly hosted by a fractured Jurassic limestone and dolomite sequence. Seven samples were collected from thermal springs of near-neutral pH (6.2 to 7.56) with discharge temperatures between 42.9 and 66.1 °C. Hydrogeochemical analyses of the thermal waters reveal four types (Na$^{+}$-Ca$^{2+}$-Cl$^{−}$, Na$^{+}$-Ca$^{2+}$-Cl$^{−}$-HCO$_{3}$ $^{−}$, Na$^{+}$-Ca$^{2+}$-Cl$^{−}$-SO$_{4}$ $^{2−}$, and Na$^{+}$-HCO$_{3}$ $^{−}$-Cl$^{−}$) and show high total dissolved solids up to 4002 mg/L. Stable isotopic results (δ$^{18}$ O and δ D) indicate that the thermal waters are of meteoric origin deeply infiltrated and heated by advective heat anomalies and raised up to the surface through deep-seated faults acting as hydrothermal conduits. The estimated reservoir temperatures using silica geothermometers and fluid-mineral equilibria overlap between 66 and 125 °C, while Na/K and K/Mg geothermometers give much higher and lower results, respectively, and are mainly influenced by mixing with cooler Mg groundwaters as indicated by the Na-K-Mg plot in the immature water field and in silica and chloride mixing models. Thermal waters deeply circulated and heated at a depth of 2 km were supplied by the higher geothermal gradients, which can reach 42.8 °C km$^{−1}$ due to the complex geological setting.
Starting Page	1
Ending Page	17
Page Count	17
File Format	PDF
ISSN	18667511
Journal	Arabian Journal of Geosciences
Volume Number	9
Issue Number	3
e-ISSN	18667538
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-02-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Northwestern Algeria Thermal waters Stable isotopes Fluid-mineral equilibria Hydrogeochemistry Geothermometry Deep circulation Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Environmental Science

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