Geochemistry and14C dating of groundwaters from Jurassic aquifers of North Aquitaine Basin (France) |
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| Institution: | 1. Engineering Department, Faculty of Chemical Engineering, University of Zanjan, P.O. Box 45371-38791, Zanjan, Iran;2. Biomedical Engineering Department, Faculty of Chemical Engineering, Tarbiat Modares University, P.O. Box 14115-114, Tehran, Iran;3. Hematology Department, Faculty of Medical Sciences, Tarbiat Modares University, P.O. Box 14115- 331, Tehran, Iran;1. CENTA Laboratory, Faculty of Mathematics, Physics and Informatics, Comenius University, 84248 Bratislava, Slovakia;2. VERA Laboratory, Faculty of Physics, University of Vienna, 1090 Vienna, Austria;1. Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands;2. Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 55 St George St, Toronto, ON, Canada;3. Leiden Observatory, PO Box 9513, 2300 RA, Leiden, The Netherlands;4. ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands;5. Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA;6. Department of Astronomy and Radio Astronomy Lab, University of California, Berkeley, CA, USA;7. Department of Physics, The George Washington University, 725 21st Street NW, Washington, DC 20052, USA;8. Astrophysics, Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH, UK;9. Sydney Institute for Astronomy, School of Physics, The University of Sydney, NSW 2006, Australia;10. Department of Physics and Electronics, Rhodes University, PO Box 94, Grahamstown, 6140, South Africa;11. Space Telescope Science Institute, 3700 San Martin Dr, Baltimore, MD 21218, United States;12. CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia;13. Laboratoire AIM (CEA/IRFU - CNRS/INSU - Université Paris Diderot), CEA DSM/IRFU/SAp, F-91191 Gif-sur-Yvette, France;14. Station de Radioastronomie de Nançay, Observatoire de Paris, CNRS/INSU, USR 704 - Univ. Orléans, OSUC, 18330 Nançay, France;15. LPC2E - Université d’Orléans / CNRS, France;p. SRON, Netherlands Institute for Space Research , Sorbonnelaan 2, 3584 CA, Utrecht, The Netherlands;q. Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands;r. Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany;s. Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK;t. NAOJ Chile Observatory, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;u. LESIA & USN, Observatoire de Paris, CNRS, PSL/SU/UPMC/UPD/SPC, Place J. Janssen, 92195 Meudon, France;1. Hertelendi Laboratory of Environmental Studies, Institute for Nuclear Research, Hungarian Academy of Sciences, H-4026 Debrecen, Bem tér 18/c, Hungary;2. University of Debrecen, Hungary;3. Research Centre for Astronomy and Earth Sciences, Institute for Geological and Geochemical Research, Hungarian Academy of Sciences, Budapest, Hungary;4. Public Limited Company for Radiactive Waste Management, Hungary;5. Isotoptech Ltd, Hungary;6. Department of Geosciences, University of Arizona, Tucson, AZ, 85721, USA |
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| Abstract: | Twenty-seven samples from a confined Lower-Middle Jurassic aquifer and an unconfined Oxfordian aquifer of the North Aquitaine Basin (France) have been analysed for their major elements, Br−,18O,2H,13C and14C contents. Hydrochemistry indicates (1) a dissolution of carbonate and anhydrite near the recharge zone and (2) a dilution of a saline water derived from a seawater/halite mixing in the deeper part of the aquifer. The mixing is also visible in a δ18O vs Cl− diagram in which two different groups appear: recent waters and old waters indicating a mixing process between fresh and saline groundwaters. The composition of the saline water is likely to be 34,100±11,200 ppm in Cl, 70±20 ppm in Br and more than −3.5±07‰ vs SMOW in18O.13C contents indicate (1) a C exchange with CaCO3 matrix for groundwaters near the recharge zone and (2) a participation of organic matter in the deep part of the aquifer.Residence times for waters near the area of the aquifer outcrop correspond to Holocene and Late Pleistocene periods. The depletion in stable isotopes of 10 to 15,000 y B.P. waters show a late glacial period infiltration to the aquifer. After a distance of about 10 km in the aquifer, the14C activities are 0 pmc showing the presence of ‘old’ groundwaters. |
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