A modified multi-elevated-temperature post-IR IRSL protocol for dating Holocene sediments using K-feldspar |
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| Institution: | 1. School of Geography and the Environment, University of Oxford, South Parks Road, Oxford, OX1 3QY, UK;2. Institute of Earth Surface Dynamics, University of Lausanne, Bâtiment Geopolis, UNIL-Mouline, 1015 Lausanne, Switzerland;3. Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, Ceredigion, SY23 3DB, UK;1. Department of Science, Systems and Models, Roskilde University, Denmark;2. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Denmark;3. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Denmark;4. Institute for Ancient Near Eastern Archaeology, Free University Berlin, Germany;5. DNRF Centre “Glass and Time,” Department of Science, Systems and Models, Roskilde University, Denmark;1. Department of Earth Sciences, ETH-Zurich, 8092 Zurich, Switzerland;2. Centre for Archaeological Science, School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW 2522, Australia;3. Centre for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, DK 4000 Roskilde, Denmark;4. Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, 69978 Tel-Aviv, Israel;5. University of Abertay, Dundee DD1 1HG, UK;6. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, DTU Risø Campus, Denmark;7. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China;8. Physics Department, McDaniel College, Westminster, MD 21157, USA;9. Institute of Earth Surface Dynamics, University of Lausanne, Geopolis, 1015 Lausanne, Switzerland;1. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Risø Campus, Roskilde, DK, 4000, Denmark;2. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Roskilde, DK, 4000, Denmark;3. Institute of Applied Geology, University of Natural Resources and Life Sciences, Peter Jordan-Str. 82, Vienna A, 1190, Austria;1. UCLA Earth, Planetary, and Space Sciences, 595 Charles Young Drive East, Box 951567, 90095 Los Angeles, CA, USA;2. University of Sheffield, Geography, Winter Street, Sheffield, South Yorkshire S10 2TN, UK;1. Institute of Geography, University of Cologne, Germany;2. Department of Geography and Earth Sciences, Aberystwyth University, United Kingdom;3. Department of Geography, Durham University, United Kingdom;4. Geological Survey of Belgium, Brussels, Belgium;5. Institute of Geological Sciences and Oeschger Centre for Climate Change Research, University of Bern, Switzerland;6. Geological Survey of Japan, AIST, Japan;7. Department of Geoscience, Aarhus University, DTU Nutech, Risø Campus, DK-4000, Roskilde, Denmark;8. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, DK-4000, Roskilde, Denmark;9. Department of Geology, Ghent University, Belgium |
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| Abstract: | A modified multi-elevated-temperature post-IR infra-red stimulated luminescence (MET-pIRIR) protocol is proposed for dating young samples of Holocene age using K-feldspar. The protocol utilizes a five-step MET-pIRIR measurement with a moderate preheating of 200 °C for 60 s, and a narrow IR stimulation temperature increment of 30 °C (i.e., the five measurement temperatures are 50, 80, 110, 140 and 170 °C). Using this method, the residual doses of the MET-pIRIR signals are generally less than 1 Gy. Holocene aeolian samples from Northern China were tested using the 30°C-increment modified MET-pIRIR method. The results demonstrate that similar ages from 140 °C to 170 °C were obtained for our samples, which were consistent with the quartz optically stimulated luminescence (OSL) ages. Based on this observation, the measurement procedures are further simplified to a three-step pIRIR protocol. The first IR stimulation at elevated temperature (110 °C) is used to remove the fading affected signals. This is followed by two steps of IR stimulation at high temperatures (140 and 170 °C) for equivalent dose (De) measurement. Dating results consistent with the expected ages have been obtained at stimulation temperatures of 140 and 170 °C. It is suggested that the first IR stimulation can effectively remove the fading component. The three-step pIRIR method has minimized the experimental procedures, while keeping the age plateau test. |
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| Keywords: | K-feldspar Holocene Aeolian sediments Post-IR IRSL Residual dose Anomalous fading |
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