Chemical evolution of groundwater in the River Danube deposits in the southern part of the Pannonian Basin (Hungary) |
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| Institution: | 1. Department of Physical and Applied Geology, Eötvös Loránd University, Budapest, Hungary;2. Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budapest, Hungary;3. Department of Mineralogy, Eötvös Loránd University, Budapest, Hungary;4. Geological and Geophysical Institute of Hungary, Budapest, Hungary;5. Lithosphere Fluid Research Laboratory, Department of Petrology and Geochemistry, Eötvös Loránd University, Budapest, Hungary;1. Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, MTA, Budaörsi út 45, H-1112 Budapest, Hungary;2. Eötvös Loránd University, Department of Physical and Applied Geology, H-1117 Budapest, Pázmány P. stny 1/C, Hungary;3. Eötvös Loránd University, Department of Probability Theory and Statistics, H-1117 Budapest, Pázmány P. stny 1/C, Hungary;4. Budapest University of Technology and Economics, Department of Sanitary and Environmental Engineering, H-1111 Budapest, Műegyetem rakpart 3, Hungary;5. University of Kaposvár, Faculty of Animal Science, Department of Botany and Plant Production, H-7400 Kaposvár, Guba S. u. 40, Hungary;6. West Transdanubian Water Authority, Department Kis-Balaton, H-8360 Keszthely, Csík Ferenc stny. 1, Hungary;7. University of West Hungary, Department of Chemistry and Environmental Sciences, H-9700 Szombathely, Károly Gáspár tér 4, Hungary;1. Department of Biological and Environmental Sciences, College of Arts and Sciences, Qatar University, State of Qatar, Doha, P.O. Box: 2713, Qatar;2. Environmental Science Center, Qatar University, State of Qatar, Doha, P.O. Box: 2713, Qatar;3. Department of Chemistry and Earth Sciences, College of Arts and Sciences, Qatar University, State of Qatar, Doha, P.O. Box: 2713, Qatar |
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| Abstract: | Processes controlling the groundwater chemical composition were studied in the River Danube deposits, in the southeastern part of Hungary. PHREEQM, a combined geochemical and one-dimensional transport model and PHREEQE, NETPATH and WATEQF geochemical computer codes were used to simulate these processes. The main processes controlling water chemistry are equilibrium with calcite, undersaturation in dolomite and albite weathering in the recharge area, ion exchange along the flow path, and ion exchange and mixing with old water at the end of the flow path. Ion exchange seems to be the most important process controlling groundwater chemistry along the flowpath in the fluvial sediments studied. Isotopic data support the geochemical model. The groundwater ages, adjusted for the modeled C mass transfer range from 3300 to 20 200 a B.P. Cation exchange suggests that displacement of a former aqueous solution by the present groundwater occurred. This displacement is attributed to tectonic and paleoclimatic events at the end of the Pleistocene. |
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