Dating of syngenetic ice wedges in permafrost with 36Cl |
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| Institution: | 1. Soil Cryology Laboratory, Institute of Physicochemical and Biological Problems in Soil Science, Russian Academy of Sciences, Pushchino 142290, Russia;2. Faculty of Physics E15, Technical University of Munich, D-85747 Garching, Germany;3. Laboratory of Quaternary Deposits, Geological Institute, Russian Academy of Sciences, Moscow 119017, Russia;4. Department of Environmental Physics, EAWAG, CH-8600 Dübendorf, Switzerland;5. Department of Cosmic Research, Polytechnic University St. Petersburg, St. Petersburg 195251, Russia;6. Alfred Wegener Institute of Polar and Marine Research, Research Unit Potsdam, Telegrafenberg A43, D-14473 Potsdam, Germany;7. Department of Cryolithology and Glaciology, Faculty of Geography, Moscow State University, Moscow 119899, Russia;1. Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Department of Periglacial Research, Potsdam, Germany;2. Lomonosov Moscow State University, Faculty of Geology, Russia;3. National Research Tomsk Polytechnic University, Russia;4. Institute of Archaeology and Ethnography, SB RAS, Novosibirsk, Russia;5. Novosibirsk State University, Russia;6. Altai State University, Barnaul, Russia;7. Kazan Federal University, Institute of Geology and Petroleum Technologies, Russia;8. St. Petersburg State University, Institute of Earth Sciences, Köppen Laboratory, Russia;9. University of Cologne, Institute of Geology and Mineralogy, Germany;1. Institute of Geology and Mineralogy, University of Cologne, Zuelpicher Str. 49a, 50674 Cologne, Germany;2. Institute of Geology and Petroleum Technologies, Kazan Federal University, Kremlyovskaya Str. 18, 420008 Kazan, Russia;3. Free University Berlin, Institute of Geological Sciences, Palaeontology Section, Malteser Str. 74-100, Building D, 12249 Berlin, Germany;4. Arctic and Antarctic Research Institute, Bering Street 38, 199397 St. Petersburg, Russia;5. St. Petersburg State University, Institute of Earth Sciences, 10 Line V.O., 33, 199178 St. Petersburg, Russia;6. Alfred Wegener Institute for Polar and Marine Research, Am Alten Hafen 26, 27568 Bremerhaven, Germany;7. Department of Ecology and Environmental Science, Umeå University, SE-901 87 Umeå, Sweden;8. Department of Geology, Bowling Green State University, Bowling Green, OH 43403, USA;9. Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany;10. Alfred Wegener Institute for Polar and Marine Research, Telegrafenberg A43, 14473 Potsdam, Germany;11. Earth and Space Sciences and Quaternary Research Center, University of Washington, Seattle 98195-1310, USA;12. Northeast Interdisciplinary Scientific Research Institute, Far East Branch, Russian Academy of Sciences, Portovaya Street 16, 685000 Magadan, Russia;13. Department of Lithospheric Research, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria;14. Natural History Museum, Burgring 7, 1010 Vienna, Austria;2. Institute A, Environmental Chemistry, University of Copenhagen, Universitetsparken 2, Copenhagen Ø DK-2100, Denmark;3. Shanghai Key Lab for Urban Ecological Processes and Eco-restoration, East China Normal University, 3663 Zhongshan RD. (N), Shanghai 200062, China;4. Center for Design, Innovation and Sustainable Transition, Aalborg University, Cph A.C. Meyers Vænge 15, Copenhagen SV DK-2450, Denmark |
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| Abstract: | A new method of permafrost dating with the cosmogenic radionuclide 36Cl is presented. In the first application, syngenetic ice wedges are dated using the ratio of 36Cl and Cl concentrations in ice as the signal. 36Cl is produced in the atmosphere by nuclear reactions of cosmic rays on argon. Stable chlorine enters the atmosphere from the oceans. Their ratio does not depend on chloride concentration in precipitations and on sublimation of snow. In situ production of 36Cl in permafrost ice via cosmic ray-induced reactions and neutron capture are calculated and the dating age limit is estimated as 3 million years. 36Cl/Cl ratios in permafrost samples from cape Svyatoy Nos (Laptev Sea coast), North-Eastern Siberia, are measured by accelerator mass spectrometry. Analysis of the first results and the calculated dates support the feasibility of the 36Cl permafrost dating method |
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