Extending the age limit of luminescence dating using the dose-dependent sensitivity of MET-pIRIR signals from K-feldspar |
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| Affiliation: | 1. Centre for Archaeological Science, School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW 2522, Australia;2. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China;1. Department of Earth Sciences, ETH, 8092 Zürich, Switzerland;2. Centre for Nuclear Technologies, DTU–Risø, Frederiksborgvej 399, Building 201, 4000 Roskilde, Denmark;3. Soil Geography and Landscape group and the Netherlands Centre for Luminescence Dating, Wageningen University, Droevendaalsesteeg 3, 6708PB Wageningen, The Netherlands;4. Institute of Earth Surface Dynamics, University of Lausanne, Geopolis, 1015 Lausanne, Switzerland;5. Nordic Laboratory for Luminescence Dating, Aarhus University, Frederiksborgvej 399, Building 201, 4000 Roskilde, Denmark;6. Institute of Earth and Environmental Sciences – Geology, University of Freiburg, Albertstr. 23b, 72104 Freiburg, Germany;7. Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel;8. Institute of Geological Sciences, University of Bern, Baltzerstrasse 1+3, 3012 Bern, Switzerland;9. Department of Earth, Planetary, and Space Sciences, UCLA, Los Angeles, CA 90095-1567, USA;10. Department of Geography, University of Sheffield, Sheffield S10 2TN, UK;1. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, DTU Risø Campus, Roskilde 4000, Denmark;2. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Roskilde 4000, Denmark;3. Geological Survey of Israel, 30 Malkhe Israel Street, Jerusalem 95501, Israel;4. Dead Sea-Arava Science Center, Patio 655, Eilat 88133, Israel;1. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Roskilde, Denmark;2. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Risø Campus, Roskilde, Denmark;3. Department of Earth Sciences, ETH-Zurich, 8092 Zurich, Switzerland;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. 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. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Denmark;2. UMR 5060 CNRS-IRAMAT-CRP2A, Université Bordeaux 3, Maison de l''archéologie, 33607 Pessac Cedex, France;3. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Denmark |
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| Abstract: | We investigated the sensitivity change of multiple-elevated-temperature (MET) stimulated post-infrared infrared-stimulated luminescence (MET-pIRIR) signals as a response to irradiation, sunlight bleaching and heating using samples from the Mu Us Desert, central China. A strong dose dependence of MET-pIRIR signal sensitivity was observed. The intensity of the test-dose signals (Tx) increase with the pre-dose received. Furthermore, the signal sensitivity can be reset by sunlight bleaching or heating. This suggests that both the electron traps and hole centres in K-feldspar can be bleached by sunlight, and can, therefore, be used for dating. Using the test-dose signal as a monitor for sensitivity change, it was found that the sensitivity (or hole centres) saturate at a higher dose (D0 = ∼750 Gy) than the sensitivity-corrected signals (or electron traps) (D0 = ∼400 Gy). We propose a multi-aliquot regenerative-dose (MAR) MET-pIRIR dating protocol, which utilises the high saturation dose of hole centres. This protocol was tested using aeolian sediments from north China with ages ranging from 0 to 470 ka. It was found that, compared to the dose limit of ∼800–1000 Gy using the normal MET-pIRIR or pIRIR procedure, the new method can measure a natural dose of up to ∼1500 Gy and produce ages consistent with the expected ages for the samples investigated. |
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