High-resolution chronologies for loess: comparing AMS 14C and optical dating results |
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| Institution: | 1. Fysische en Regionale Geografie, K.U. Leuven, Redingenstraat 16, B-3000 Belgium;2. Laboratoire des Sciences du Climat et de l’Environnement, UMR1572 CEA/CNRS, Gif-sur-Yvette cedex F-91198, France;3. Paléoenvironnement et Palynologie, Institut des Sciences de l’Évolution, UMR 5554-CNRS, Université Montpellier II, Place E. Bataillon, Montpellier cedex 5 F-34095, France;4. Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA;5. Laboratoire de Géographie Physique-CNRS, UMR CNRS 8591, 1 Place Aristide Briand, Meudon cedex 92 195, France;6. Lehrstuhl Geomorphologie, Universität Bayreuth, Bayreuth D-95440, Germany;1. MOE Key Laboratory of Western China''s Environmental Systems, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;2. CAS Center for Excellence in Tibetan Plateau Earth Sciences of the Chinese Academy of Sciences, Beijing 100101, China;1. Institute of Glaciology and Ecogeography, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;2. South Scientific Centre, Russian Academy of Sciences, Chekhova Av. 41, 344006 Rostov-on-Don, Russia;3. Institute of Geography, Russian Academy of Sciences, Staromonetny, 29, Moscow 109027, Russia;1. School of Geography Science, Nanjing Normal University, Nanjing, 210023, China;2. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, 210023, China;3. Leibniz Institute for Applied Geophysics; Stilleweg 2, 30655, Hannover, Germany;4. Croatian Geological Survey, Department of Geology, Sachsova 2, 10000, Zagreb, Croatia;5. University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, Pierottijeva 6, HR-10000, Zagreb, Croatia;1. School of Biological Sciences, The University of Adelaide, Adelaide, South Australia, 5000, Australia;2. Global Ecology Partuyarta Ngadluku Wardli Kuu, College of Science and Engineering, ARC Centre of Excellence for Australian Biodiversity and Heritage, GPO Box 2100, Flinders University, Adelaide, South Australia, 5001, Australia;1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;2. Laboratory for Earth Surface Processes, Department of Geography, Peking University, Beijing 100871, China;1. U.S. Geological Survey, Denver Federal Center, Box 25046, MS-980, Denver, CO 80225, USA;2. U.S. Geological Survey, 12201 Sunrise Valley Drive, MS-926A, Reston, VA 20192, USA;3. Illinois State Geological Survey, University of Illinois, 615 E Peabody Drive, Champaign, IL 61820, USA;4. Department of Biology, University of New Mexico, Albuquerque, NM 87131, USA |
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| Abstract: | The Nußloch loess section in South West Germany is famous in Central Europe for its thick deposits from the Last Glacial Maximum. It has therefore been intensively studied during the past few years and offers an excellent opportunity to compare the performance of different dating techniques covering the period 15–45 ka.Here we present results from optical and AMS 14C dating. The silt-sized polymineral fraction of the clastic sediments and a multiple-aliquot approach was used for IR-OSL dating. 14C dating was carried out on organic macro-remnants and humin fractions extracted from the sediments.With the exception of samples taken from the uppermost 1.5 m of the section, IR-OSL and calibrated 14C-AMS ages are consistent over the entire period. The inconsistencies in the upper meters are thought to be due to disturbances during soil formation in the Holocene. The good agreement obtained on the remaining sequence demonstrates the high accuracy of both methods when studying loess sections: for the IR-OSL ages no significant age underestimations are obvious.The results clearly document that accurate chronologies can be developed for such continental sedimentary sequences. This gives access to archives that can now be studied with a high temporal resolution and allows the establishment of new paleoclimatic proxies for the study of terrestrial responses to past climatic changes. |
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