Using 3H and 14C to constrain the degree of closed-system dissolution of calcite in groundwater |
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| Institution: | 1. School of Geosciences, Monash University, Clayton, Vic. 3800, Australia;2. National Centre for Groundwater Research and Training, GPO Box 2100, Flinders University, Adelaide, SA 5001, Australia;3. Department of Nuclear Physics, Australian National University, ACT 0200, Australia;4. Institute of Geological and Nuclear Sciences, PO Box 30368, Lower Hutt, New Zealand;1. University of Barcelona, Spain;2. U.S. Geological Survey, Menlo Park, CA USA;1. Aix-Marseille Université, CNRS-IRD-Collège de France, UM 34 CEREGE, Technopôle de l''Environnement Arbois-Méditerranée, BP80, 13545 Aix-en-Provence, France;2. Institute for Radioprotection and Nuclear Safety, PRP-DGE/SRTG, BP 17, F-92262 Fontenay-aux-Roses, France;3. Université de Nîmes, Laboratoire de Géochimie Isotopique (GIS), 150 rue George Besse, 30035 Nîmes, France;4. Department of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, ACT 0200, Australia;5. Laboratoire d''Hydrologie d''Avignon, UMR EMMAH 11144 INRA, Université d''Avignon, 84000 Avignon, France;6. Institute of Geological Sciences, 55-b, Gonchara Str., Kiev 01054, Ukraine;7. Ukrainian Institute of Agricultural Radiology, UIAR NUBiP of Ukraine, Mashinobudivnykiv str. 7, Chabany, Kyiv-Svjatoshin, Ukraine;1. Institute of Geological Sciences, University of Bern, Baltzerstrasse 1+3, CH-3012 Bern, Switzerland;2. Eawag, Swiss Federal Institute of Aquatic Science and Technology, Department of Water Resources and Drinking Water, Überlandstrasse 133, CH-8600 Dübendorf, Switzerland;3. Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8564, Japan;4. IST, Institute of Earth Science, University of Applied Sciences and Arts of Southern Switzerland (SUPSI), Campus Trevano, CH-6952 Canobbio, Switzerland;5. IMG-Centre d’Analyse Minérale, Faculty of Geosciences and Environment, University of Lausanne (UNIL), Anthropole, CH-1015 Lausanne, Switzerland;6. Institute of Biogeochemistry and Pollutant Dynamics, Swiss Federal Institute of Technology (ETH), CH-8092 Zürich, Switzerland;7. Institute of Geochemistry and Petrology, Swiss Federal Institute of Technology (ETH), CH-8092 Zürich, Switzerland;8. IMG, Laboratoire des Isotopes Stables, Faculty of Geosciences and Environment, University of Lausanne (UNIL), Anthropole, CH-1015 Lausanne, Switzerland;1. National Centre for Groundwater Research and Training (NCGRT), School of the Environment Flinders University, GPO Box 2100, South Australia, Australia;2. Commonwealth Scientific and Industrial Research Organization (CSIRO), Division of Land and Water, Floreat, WA, Australia;3. Commonwealth Scientific and Industrial Research Organization (CSIRO), Division of Land and Water, Glen Osmond, SA, Australia;4. Rio Tinto Iron Ore, 162-168 St Georges Tce, Perth, WA, Australia;5. Department of Water Resources and Drinking Water, Eawag: Swiss Federal Institute of Aquatic Science and Technology, Ueberlandstrasse 133, 8600 Dubendorf, Switzerland;1. Centre de Recherche Nucléaire d’Alger, Dpt Datation et Traçage Isotopique, 2, Bd F. Fanon, BP399, Alger-Gare, 16000, Alger, Algeria;2. Geodynamics and Mineral Resources, Royal Museum for Central Africa, B-3080, Tervuren, Belgium;3. Direction de l’Hydraulique de la Wilaya de Tamanrasset, Tamanrasset, Algeria;4. Faculté des Sciences de la Terre, de la Géographie et de l’Aménagement du Territoire, USTHB-FSTGAT, Alger, Algeria |
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| Abstract: | This study uses 3H concentrations, 14C activities (a14C), 87Sr/86Sr ratios, and δ13C values to constrain calcite dissolution in groundwater from the Ovens catchment SE Australia. Taken in isolation, the δ13C values of dissolved organic C (DIC) and 87Sr/86Sr ratios in the Ovens groundwater imply that there has been significant calcite dissolution. However, the covariance of 3H and 14C and the calculated initial 14C activities (a014C) imply that most groundwater cannot have dissolved more than 20% of 14C-free calcite under closed-system conditions. Rather, calcite dissolution must have been partially an open-system process allowing 13C and 14C to re-equilibrate with CO2 in the unsaturated zone. Recognising that open-system calcite dissolution has occurred is important for dating deeper groundwater that is removed from its recharge area in this and other basins. The study is one of the first to use 14C and 3H to constrain the degree of calcite dissolution and illustrates that it is a valuable tool for assessing geochemical processes in recharge areas. |
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