Single-grain TT-OSL bleaching characteristics: Insights from modern analogues and OSL dating comparisons



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Arnold, Lee and Demuro, Martina and Spooner, Nigel and Prideaux, Gavin and McDowell, Matthew Charles and Camens, Aaron B. and Reed, Elizabeth H. and Parés, Josep M. and Arsuaga, Juan Luis and Bermúdez de Castro, José María and Carbonell i Roura, Eudald (2018) Single-grain TT-OSL bleaching characteristics: Insights from modern analogues and OSL dating comparisons. Quaternary Geochronology . ISSN 1871-1014 (In Press)

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Previous assessments of thermally transferred optically stimulated luminescence (TT-OSL) signal resetting in natural sedimentary settings have been based on relatively limited numbers of observations, and have been conducted primarily at the multi-grain scale of equivalent dose (De) analysis. In this study, we undertake a series of single-grain TT-OSL bleaching assessments on nineteen modern and geological dating samples from different sedimentary environments. Daylight bleaching experiments performed over several weeks confirm that single-grain TT-OSL signals are optically reset at relatively slow, and potentially variable, rates. Single-grain TT-OSL residual doses range between 0 and 24 Gy for thirteen modern samples, with >50% of these samples yielding weighted mean De values of 0 Gy at 2σ. Single-grain OSL and TT-OSL dating comparisons performed on well-bleached and heterogeneously bleached late Pleistocene samples from Kangaroo Island, South Australia, yield consistent replicate age estimates. Our results reveal that (i) single-grain TT-OSL residuals can potentially be reduced down to insignificant levels when compared with the natural dose range of interest for most TT-OSL dating applications; (ii) the slow bleaching properties of TT-OSL signals may not necessarily limit their dating applicability to certain depositional environments; and (iii) non-trivial differences may be observed between single-grain and multi-grain TT-OSL bleaching residuals in some modern samples. Collectively, these findings suggest that single-grain TT-OSL dating may offer advantages over multi-grain TT-OSL dating in certain complex depositional environments.

Item Type:Article
Uncontrolled Keywords:Luminescence dating, Thermally transferred optically stimulated luminescence (TT-OSL), Single-grain, Modern analogues, Spain, Australia
Subjects:Sciences > Geology > Stratigraphic geology
Sciences > Geology > Paleontology
ID Code:46862
Deposited On:16 Mar 2018 09:37
Last Modified:03 Feb 2020 00:01

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