OSL dating of mixed coastal sediment (Sylt,German Bight,North Sea) |
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| Institution: | 1. Leibniz Institute for Applied Geophysics (LIAG), Section S3: Geochronology and Isotope Hydrology, Stilleweg 2, 30655 Hannover, Germany;2. University of Hamburg, Institute for Geology and Palaeontology, Hamburg, Germany;3. Radiation Research Division, Risø DTU, Roskilde, Denmark;4. 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. Faculty of Applied Science, Department of Luminescence Materials and Radiation Detection, Delft University of Technology, Netherlands;2. Netherlands Centre for Luminescence Dating (NCL), Wageningen University, Netherlands;3. Soil Geography and Landscape Group, Wageningen University, Netherlands;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-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. Institute of Geography, University of Cologne, Albertus-Magnus-Platz, 50923, Cologne, Germany;2. School of Physical Sciences, Environment Institute, Institute for Photonics and Advanced Sensing (IPAS), University of Adelaide, North Terrace Campus, Adelaide, SA, 5005, Australia;3. Australian Research Centre for Human Evolution (ARCHE), Environmental Futures Research Institute (EFRI), Griffith University, 170 Kessels Road, Nathan, QL, 4111, Australia;4. Institute of Geological Sciences, University of Bern, Baltzerstr. 1-3, 3012, Bern, Switzerland;5. Laboratoire Image, Ville, Environnement (LIVE), UMR 7362 - CNRS, University of Strasbourg-ENGEES, 3 rue de l’Argonne, 67083, Strasbourg Cedex, France;6. Centro Nacional de Investigación sobre la Evolución Humana (CENIEH), Paseo de Atapuerca, 3, 09002, Burgos, Spain |
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| Abstract: | As part of a study on coastal sedimentary processes this paper presents the OSL dating of mixed coastal sediment samples from the southern North Sea island of Sylt (German Bight). During coring of the swash-bar (beach) sediments, five samples were presumably contaminated by younger overwash and aeolian sediments because of the sampling method employed. To obtain reliable burial ages for these swash-bar sediments, single-grain and small aliquot measurements were used together with the Finite Mixture Model (FMM) proposed by Roberts et al. (2000) to identify the grain population containing the largest doses (from the deepest part of the core). Before the FMM was applied to dating, the parameters and performance of the FMM were first investigated by systematically comparing small aliquot (～20 grains) and single-grain measurements of an undisturbed aeolian and swash-bar sample and a laboratory mixture of both sediments. This test case demonstrates the advantage of selecting the time interval immediately following the initial luminescence signals for background subtraction because unsuitable quartz grains were removed from the dose distribution. It is concluded that the measurement of small aliquots can be regarded as a reliable proxy for single-grain dose distribution if the sediment contains only a small proportion of quartz grains emitting a luminescence signal and that the FMM results are relatively insensitive to changes of the over-dispersion parameter between 5–40% for small aliquots and 10–40% for single-grains.We show that the burial ages of the contaminated swash-bar samples resulting from the maximum age populations from equivalent dose distributions measured using small aliquots are consistent with the stratigraphy and with ages obtained from uncontaminated samples. |
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