RT Journal Article
T1 Single-grain TT-OSL bleaching characteristics: Insights from modern analogues and OSL dating comparisons
A1 Arnold, Lee
A1 Demuro, Martina
A1 Spooner, Nigel
A1 Prideaux, Gavin
A1 McDowell, Matthew Charles
A1 Camens, Aaron B.
A1 Reed, Elizabeth H.
A1 Parés, Josep M.
A1 Arsuaga Ferreras, Juan Luis
A1 Bermúdez de Castro, José María
A1 Carbonell i Roura, Eudald
AB 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.
PB Elsevier
SN 1871-1014
YR 2018
FD 2018-02-03
LK https://hdl.handle.net/20.500.14352/11991
UL https://hdl.handle.net/20.500.14352/11991
LA eng
NO Ministerio de Economía y Competitividad (MINECO)
NO Australian Research Council
DS Docta Complutense
RD 21 sept 2024