Insights into TT-OSL signal stability from single-grain analyses of known-age deposits at Atapuerca,Spain |
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| Institution: | 1. School of Physical Sciences, Institute for Photonics and Advanced Sensing (IPAS), and Environment Institute, University of Adelaide, North Terrace Campus, Adelaide, SA 5005, Australia;2. Centro Nacional de Investigación sobre la Evolución Humana, CENIEH, Paseo Sierra de Atapuerca s/n, 09002 Burgos, Spain;3. School of Physical Sciences, Institute for Photonics and Advanced Sensing (IPAS), University of Adelaide, North Terrace Campus, Adelaide, SA 5005, Australia;1. Turkish Atomic Energy Authority, Sarayköy Nuclear Research and Training Center, 06983 Saray, Ankara, Turkey;2. Dokuz Eylül University, Faculty of Science, Department of Physics, 35370 Buca, ?zmir, Turkey;3. Çanakkale Onsekiz Mart University, Department of Geological Engineering, 17020 Çanakkale, Turkey;4. Çanakkale Onsekiz Mart University, Department of Geophysical Engineering, 17020 Çanakkale, Turkey;1. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. Department of Earth Sciences, University of Hong Kong, Hong Kong, China;3. Centre for Archaeological Science, School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW 2522, Australia;4. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100049, China;1. Laboratoire Halma UMR 8164 (CNRS), Université Lille 1, 59655 Villeneuve d''Ascq Cedex France;2. Laboratoire de Luminescence LUX, Département des Sciences de la Terre et de l''Atmosphère, Université du Québec à Montréal, CP 8888 Succ. Centre-Ville, H3C 3P8 Montréal, Canada;3. Laboratoire de Géomorphologie, Département de Géographie, Université de Tunis, 94 bd du 9 avril 1938, Tunis, Tunisia;1. Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8567, Japan;2. Japan Society for the Promotion of Science, Japan |
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| Abstract: | Single-grain thermally transferred optically stimulated luminescence (TT-OSL) dating has recently been applied to a number of the Atapuerca palaeoanthropological sites. As yet, however, there have not been any direct assessments of TT-OSL signal stabilities for specific grains used for dating. In this study, we undertake a series of TT-OSL suitability assessments on known-age samples from Gran Dolina and Sima del Elefante. Our results suggest that the Atapuerca samples contain populations or sub-populations of grains with suitably stable TT-OSL signals for dating over late-Early and Middle Pleistocene timescales. Equivalent dose (De) distribution analysis in combination with pulse-annealing assessments provides a useful means of identifying inter-grain and inter-sample differences in TT-OSL signal stabilities. We also show that obtaining De values using different preheat conditions may help to identify potentially problematic TT-OSL behaviours. Analyses of multi-grain aliquot TL curves for these samples reveal that 'bulk' TL signal loss experiments may provide limited insights into TT-OSL source trap lifetimes due to averaging effects, the dominance of grain populations that do not produce TT-OSL, and interference from slowly bleaching OSL components. Our results improve the robustness and precision of existing TT-OSL chronologies for units TD6-3 and TE16-TE17 at Gran Dolina and Sima del Elefante, and support the broader suitability of the single-grain TT-OSL approach at the Atapuerca sites. |
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| Keywords: | Luminescence dating Thermally transferred optically stimulated luminescence (TT-OSL) Single-grain Atapuerca Early Pleistocene |
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