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Single-grain TT-OSL bleaching characteristics: Insights from modern analogues and OSL dating comparisons
Citation
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, Single-grain TT-OSL bleaching characteristics: Insights from modern analogues and OSL dating comparisons, Quaternary Geochronology, 49 pp. 45-51. ISSN 1871-1014 (2019) [Refereed Article]
Copyright Statement
© 2018 Elsevier B.V. All rights reserved.
DOI: doi:10.1016/j.quageo.2018.01.004
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 Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | luminescence dating, thermally transferred optically stimulated luminescence (TT-OSL), single-grain, modern analogues, Spain, Australia |
| Research Division: | Earth Sciences |
| Research Group: | Geology |
| Research Field: | Palaeontology (incl. Palynology) |
| Objective Division: | Environment |
| Objective Group: | Flora, Fauna and Biodiversity |
| Objective Field: | Flora, Fauna and Biodiversity at Regional or Larger Scales |
| UTAS Author: | McDowell, MC (Dr Matthew McDowell) |
| ID Code: | 132321 |
| Year Published: | 2019 |
| Web of Science® Times Cited: | 3 |
| Deposited By: | Plant Science |
| Deposited On: | 2019-05-02 |
| Last Modified: | 2019-08-08 |
| Downloads: | 0 |
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