Single-grain dating of young sediments using the pIRIR signal from feldspar |
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| Institution: | 1. Leibniz Institute for Applied Geophysics (LIAG), Section S3: Geochronology and Isotope Hydrology, Stilleweg 2, 30655 Hannover, Germany;2. Radiation Research Division, Risø National Laboratory for Sustainable Energy, DTU, Roskilde, Denmark;3. Nordic Laboratory for Luminescence Dating, Department of Earth-Sciences, Aarhus University, Risø DTU, Roskilde, Denmark;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, 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. 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. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, DK-4000 Roskilde, Denmark;2. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, DTU Nutech, Risø Campus, DK-4000 Roskilde, Denmark;3. Côa Parque, Fundação para a Salvaguarda e Valorização do Vale do Côa, Rua do Museu, 5150-610 Vila Nova de Foz Côa, Portugal;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 |
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| Abstract: | In this article we test for the first time the potential of single-grains of K-rich feldspar to date well-bleached and poorly bleached sediments using a post-IR IRSL (pIRIR) protocol. We measure natural dose distributions using K-rich feldspars from four coastal samples applying the pIRIR protocol with a preheat of 200 °C and a pIRIR stimulation temperature of 180 °C; each sample had an independent age control obtained from quartz OSL and radiocarbon dating. We also analyse single-grain dose distributions of “zero-dose” and γ-irradiated samples to determine thermal transfer/residual doses and the intrinsic sources of variability of pIRIR single-grain measurements, respectively. Based on these experiments, we conclude that thermal transfer/residual dose give rise to an offset of ～0.6 Gy in these samples and that the uncertainty assigned to individual pIRIR single-grain dose estimates cannot be smaller than 16.5%.The analysis of the well-bleached samples shows that only the brightest 30% of the grains give pIRIR single-grain ages in agreement with the age control; this effect may arise from the suggested correlation between blue emission and potassium content of individual grains. Comparison of single-grain quartz and feldspar dose distributions from the poorly bleached samples shows that quartz is relatively better bleached; nevertheless, selection of a reliable ‘minimum’ feldspar dose was achieved using two different statistical models. |
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