engleski

Genesis of the thermal-mineral waters of Ilidža, Bosnia and Herzegovina

The springs of thermal-mineral waters (TMWs) of Ilidža near Sarajevo appear at the transition of the Central and Inner Dinarides of Bosnia and Herzegovina at the overthrust front of the Bosnian Flysch and the far southeastern part of Sarajevo-Zenica Tertiary basin. The wider area of Ilidža is made of Mesozoic and Cenozoic deposits. The genesis of the TMWs of Ilidža was determined from the structural tectonic relationships and hydrogeological features of the terrain, as well as from the analysis of hydrogeochemical indicators and isotopic compositions of water and gases. Hydrogeochemical methods included analysis of the hydrocarbon indicators, ionic ratio calculations and genetic classifications. Primary aquifer of TMWs of Ilidža are Permian- Triassic sediments with gypsum and anhydrites, and secondary aquifers are Triassic carbonates and alluvial deposits. The temperature of the TMWs is the result of the level of intensity of the interaction of the depth of infiltration of atmospheric water and the geothermal gradient, the static pressure in the lenses of Permian- Triassic deposits, and the dynamic factors of TMWs moving and ascending through porous rocks over long distances under extremely high pressures. The TMWs are of atmospheric origin and had no interaction with atmospheric or surface waters since year 1953. TMWs are formed in the upper Pleistocene at the time of the colder climate within the epoch. Sulfates in TMWs originate from the Permian-Triassic evaporites and H2S most likely from sulfates reducing conditions. CO2 is produced from metamorphosedcarbonates, deeper in the the Earth’s crust.

aquifer genesis ; thermal-mineral waters ; sulfates ; Ilidža

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