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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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