A novel approach to varve counting using μXRF and X-radiography in combination with thin-section microscopy,applied to the Late Glacial chronology from Lake Suigetsu,Japan |
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| Institution: | 1. Institute of Geography and Earth Sciences, Aberystwyth University, SY23 3DB, UK;2. School of Geography, University of Nottingham, Nottingham, NG7 2RD, UK;3. Section 5.2: Climate Dynamics and Landscape Evolution, German Research Center for Geoscience (GFZ), Telegrafenberg, D-14473 Potsdam, Germany;4. Department of Geography, University of Newcastle upon Tyne, Newcastle upon Tyne, UK;5. Research Laboratory for Archaeology & the History of Art, University of Oxford, Oxford, OX1 3QY, UK;6. Institute of Geological Sciences, Palaeontology, Free University Berlin, Malteserstrasse 74-100, Building D, 12249 Berlin, Germany;7. Faculty of Policy Informatics, Chiba University of Commerce, Chiba 272-8512, Japan;8. Department of Biology and Geosciences, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan;9. Department of Earth and Planetary Sciences, University of Tokyo, Tokyo, Japan;10. College of Education, Naruto University of Education, 748 Nakashima, Takashima, Naruto 772-8502, Japan;1. Centre for Micromorphology, Department of Geography, Royal Holloway, University of London, Egham, Surrey, TW20 0EX, UK;2. Centre for Quaternary Research, Department of Geography, Royal Holloway, University of London, Egham, Surrey, TW20 0EX, UK;3. Centre for Micromorphology, School of Geography, Queen Mary University of London, Mile End Road, London E1 4NS, UK;1. Faculty of Oceanography and Geography, University of Gdansk, Poland;2. Faculty of Physics, Adam Mickiewicz University, Poznan, Poland;3. Poznan Radiocarbon Laboratory, Foundation of the Adam Mickiewicz University, Poznan, Poland;1. School of Earth & Sustainability, Northern Arizona University, Flagstaff, Arizona, USA;2. Renard Centre of Marine Geology, Ghent University, Krijgslaan 281, S8 WE13, 9000, Ghent, Belgium;3. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Canada;4. U.S. Geological Survey, 4210 University Drive, Anchorage, Alaska, USA;1. Department of Geology, University of Patras, 26504 Rio Patras, Greece;2. Department of Medical Physics, University Hospital of Patras, 26504 Rio Patras, Greece;3. Department of Radiology/Medical School, University of Patras, 26504 Rio Patras, Greece;1. School of Science, University of Waikato, Private Bag 3105, Hamilton, New Zealand;2. ARC Centre of Excellence for Australian Biodiversity and Heritage, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW, 2052, Australia;3. National Institute of Water & Atmospheric Research Ltd (NIWA), 41 Market Place, Viaduct Harbour, Auckland, New Zealand;5. School of Environment, University of Auckland, New Zealand;6. Gondwana Tree-Ring Laboratory, 9A Poulson St., Christchurch, 8024, New Zealand |
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| Abstract: | The Lake Suigetsu 2006 Varved Sediment Core Project (SG06 Project) aims to contribute to the international terrestrial radiocarbon calibration model, extending it to >50,000 cal years BP using the new SG06 sediment record, which shows annual laminations (varves) for most of this period. For varve counting, a novel approach using high resolution X-ray fluorescence (μXRF) and X-radiography was applied, described here in detail for the first time, and applied to the Late Glacial sediments of core SG06. This new technique was carried out alongside conventional varve counting by thin-section microscopy (Schlolaut et al., 2012). This dual approach allows comparison of results from the two independent counting methods on metre to sub-mm scales, enabling the identification and characterisation of differences between the techniques, and quantification of their weaknesses. Combining the results produces a more robust chronology than either counting method could produce alone. The reliability of this dual approach is demonstrated by comparison of the combined chronology with the radiocarbon dataset of SG06, calibrated with the tree-ring derived Late Glacial section of IntCal09. |
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