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

Arnold, LJ, Demuro, M, Spooner, NA, Prideaux, GJ, McDowell, MC ORCID: 0000-0001-8009-4171, Camens, AB, Reed, EH, Pares, JM, Arsuaga, JL, Bermudez de Castro, JM and Carbonell, E 2019 , 'Single-grain TT-OSL bleaching characteristics: Insights from modern analogues and OSL dating comparisons' , Quaternary Geochronology, vol. 49 , pp. 45-51 , doi: 10.1016/j.quageo.2018.01.004.

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Abstract

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
Authors/Creators:Arnold, LJ and Demuro, M and Spooner, NA and Prideaux, GJ and McDowell, MC and Camens, AB and Reed, EH and Pares, JM and Arsuaga, JL and Bermudez de Castro, JM and Carbonell, E
Keywords: luminescence dating, thermally transferred optically stimulated luminescence (TT-OSL), single-grain, modern analogues, Spain, Australia
Journal or Publication Title: Quaternary Geochronology
Publisher: Elsevier
ISSN: 1871-1014
DOI / ID Number: 10.1016/j.quageo.2018.01.004
Copyright Information:

© 2018 Elsevier B.V. All rights reserved.

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