Genesis of the thermal-mineral waters of Ilidža, Bosnia and Herzegovina
DOI:
https://doi.org/10.17794/rgn.2019.1.11Keywords:
aquifer genesis, thermal-mineral waters, sulphates, IlidžaAbstract
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 composed 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 clas- sifications. The 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 resulted from the interac- tion of infiltration depth of atmospheric water and the geothermal gradient. 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, contributed as well. The TMWs are of atmospheric origin and had no interaction with the atmospheric or surface waters since the year of 1953. TMWs are formed in the Upper Pleistocene, at the time of the cold climate within the epoch. Sulphates in TMWs originated from the Permian-Triassic evaporites. H2S is produced under sulphate reducing conditions and CO2 is produced from metamorphosed carbonates.
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