Development of climatic and vegetation conditions and the geochemical and isotopic composition in the Franconian Albvorland aquifer system |
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| Institution: | 1. Institut für Nukleare Entsorgungstechnik, Forschungszentrum Karlsruhe, Karlsruhe, Germany;2. UFZ-Umweltforschungszentrum Leipzig-Halle, Leipzig, Germany;3. Institute of Hydrology, GSF-National Research Center for Environment and Health, Neuherberg, Germany;4. Institut für Botanik, University Hohenheim, Leinfelden-Echterdingen, Germany;1. College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou 310014, PR China;2. School of Medicine and Pharmaceutical Engineering, Taizhou Vocational and Technical College, Taizhou 318000, PR China;1. School of Geography and Centre for Water and Planetary Health, University of Lincoln, Brayford Pool, Lincoln LN6 7TS, UK;2. Department of Earth and Environmental Sciences and Williamson Research Centre for Molecular Environmental Science, The University of Manchester, Williamson Building, Oxford Road, Manchester M13 9PL, UK;3. NERC Radiocarbon Facility, Scottish Enterprise Technology Park, Rankine Avenue, East Kilbride G75 OQF, UK;4. NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottingham NG12 5GG, UK;1. Geology Department, Faculty of Science, Damanhour University, El-Gomhouria St, Damanhour 22511, Egypt;2. School of Earth Sciences, Zhejiang University, Zheda Road 38, Hangzhou 310027, China;3. Geology Department, Faculty of Science, Zagazig University, Zagazig 44519, Egypt;4. Dept. of Geology & Geophysics, College of Science, King Saud Univ., P.O. Box 2455, Riyadh 11451, Saudi Arabia |
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| Abstract: | The impact of climatic and vegetation conditions over the past 15 Ka on the chemical composition and 14C dating of groundwater from the Franconian Albvorland aquifer system is discussed. Seven groundwaters over a flow distance of 25.5 km are investigated. Groundwater dating is made by 14C of dissolved inorganic carbon (DIC) and aqueous fulvic acid as well as 18O. 14C dating via fulvic acid gives groundwater ages consistent with climatic and vegetation records and variations in the groundwater composition. No correction for geochemical processes is required, since under these geochemical conditions fulvic acid remains stable over this time period and flow-distance. On the other hand, 14C dating via DIC requires correction of the 14C value due to perturbation by different geochemical processes. Up to a groundwater flow distance of approximately 17 km and an age of about 10 Ka, the 14C dating by DIC shows considerable dependence on the 14C-correction model applied. Beyond this groundwater age, 14C-DIC dating results in an overestimation by two to three 14C half-lives (T1/2=5730 a). This deviation may result from different groundwater recharge conditions at the end of the past glaciation and geochemical processes acting on DIC that cannot be adequately characterized. The present study has implications for humic substance mediated transport of pollutants in natural aquatic systems over long time periods. |
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