期刊
QUATERNARY GEOCHRONOLOGY
卷 49, 期 -, 页码 45-51出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.quageo.2018.01.004
关键词
Luminescence dating; Thermally transferred optically stimulated luminescence (TT-OSL); Single-grain; Modern analogues; Spain; Australia
资金
- Australian research Council (ARC) Future Fellowship project [FT130100195]
- Ministerio de Economia y Competitividad de Espana [CGL2010-16821, DE160100743]
- Marie Curie International Reintegration Grant [PIRG08-GA-2010-276810]
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 (D-e) 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 D-e values of 0 Gy at 2a. 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.
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