Feldspar multi-elevated-temperature post-IR IRSL dating of the Wulanmulun Paleolithic site and its implication |
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| Affiliation: | 1. MOE Laboratory for Earth Surface Processes, Department of Geography, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;2. Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China;3. Ordos Antiquity & Archaeology Institution, Ordos, Inner Mongolia Autonomous Region 017200, China;1. Sheffield Luminescence Laboratory, Geography Department, University of Sheffield, Winter St., Sheffield S10 2TN, UK;2. Department of Archaeology, University of Sheffield, Northgate House, West Street, Sheffield S1 4ET, UK;3. Environment Department, University of York, Heslington, York SO10 5DD, UK;1. School of Geography and Tourism, Jiaying University, Meizhou 514015, China;2. Department of Geography and Earth Sciences, Aberystwyth University, Ceredigion SY23 3DB, UK;3. School of Geographical Science, South China Normal University, Guangzhou 510631, China;4. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China;5. Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;1. Department of Geology, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden;2. Department of Environmental Sciences, Norwegian University of Life Sciences, PO Box 5003, NO-1432 Ås, Norway;1. IRAMAT-CRP2A UMR 5060 CNRS – University of Bordeaux-Montaigne, Pessac, France;2. ArScAn – AnTET UMR 7041 CNRS – University of Paris Ouest – Nanterre, Nanterre, France;3. Laboratoire des Sciences du Climat et de l''Environnement UMR 8212 CNRS-CEA-UVSQ, Gif sur Yvette, France;4. CSIC- Institución Milá y Fontanals (IMF), Departamento de Arqueología y Antropología + grupo AGREST, Barcelona, Spain;5. Instituto de Ciencias Ambientales y Evolutivas, Universidad Austral de Chile, Chile;6. Fundação Museu do Homem Americano (FUMDHAM), São Raimundo Nonato, Brazil;7. Département de Préhistoire du Muséum National d''Histoire Naturelle, UMR7194, Paris, France;8. Archaeology department, Universidade Federal de Pernambuco, Recife/PE, Brazil;1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 99 Lincheng Road, Guiyang, 550081, China;2. Department of Geosciences, National Taiwan University, Taipei, 10617, Taiwan, ROC;3. College of Geographical Sciences, Nanjing Normal University, Nanjing, 210023, China;4. School of Archaeology and Museology, Peking University, Beijing, 100871, China;5. Guizhou Provincial Institute of Cultural Relics and Archaeology, Guizhou, 550004, China;1. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China;2. Centre for Archaeological Science, School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW 2522, Australia |
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| Abstract: | The Wulanmulun site found in 2010 is an important Paleolithic site in Ordos (China), from which lots of stone and bone artifacts and mammalian fossils have been recovered. It was previously dated by radiocarbon and optically stimulated luminescence (OSL) techniques on quartz. To further confirm the reliability of the chronology constructed based on OSL ages and test the applicability of the recently developed pIRIR procedure on sediments from northern China, twenty-four sediment samples (including eolian, lacustrine and fluvio-eolian sands) from the site were determined using the multi-elevated-temperature post-IR IRSL (MET-pIRIR or pIRIR) procedure on potassium feldspar. The results show that the studied samples have two MET-pIRIR De preheat plateaus (280–320 and 340–360 °C), and the bleaching rates of the luminescence signals are associated with sample ages and stimulation temperatures. All the pIRIR ages (7–155 ka) corrected for anomalous fading and residual dose obtained after solar bleaching for 15 h are larger than the corresponding quartz OSL ages (4–66 ka) previously determined, even for the young eolian samples (<10 ka). But the corrected IRSL(50 °C) ages (6–85 ka) are broadly consistent with the quartz ages. It appears that the IRSL(50 °C) ages are more reliable, although this contradicts the previously results obtained by other people. On the other hand, we also obtained an extended age plateau between the stimulation temperatures of 50 and 290 °C in the plot of age versus stimulation temperature (A-T plot) by subtracting different residual doses obtained after different bleaching times. The reliability of the plateau ages requires further investigation. For the sediment samples from this site, quartz should be more suitable for dating than K-feldspar, and the quartz OSL ages of 50–65 ka for its cultural layer should be reliable. |
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| Keywords: | Potassium feldspar Luminescence dating MET-pIRIR procedure Residual dose subtraction Preheat plateau Extended age plateau Wulanmulun Paleolithic site |
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