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oai:docta.ucm.es:20.500.14352/119912024-07-17T13:56:04Zcom_20.500.14352_14col_20.500.14352_15

Single-grain TT-OSL bleaching characteristics: Insights from modern analogues and OSL dating comparisons Arnold, Lee Demuro, Martina Spooner, Nigel Prideaux, Gavin McDowell, Matthew Charles Camens, Aaron B. Reed, Elizabeth H. Parés, Josep M. Arsuaga Ferreras, Juan Luis Bermúdez de Castro, José María Carbonell i Roura, Eudald 550.93 551.79 Luminescence dating Thermally transferred optically stimulated luminescence (TT-OSL) Single-grain Modern analogues Spain Australia Geología estratigráfica Paleontología 2506.19 Estratigrafía 2416 Paleontología 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. Ministerio de Economía y Competitividad (MINECO) Australian Research Council Depto. de Geodinámica, Estratigrafía y Paleontología Fac. de Ciencias Geológicas TRUE inpress 2023-06-17T12:26:20Z 2023-06-17T12:26:20Z 2018-02-03 journal article https://hdl.handle.net/20.500.14352/11991 1871-1014 10.1016/j.quageo.2018.01.004 eng CGL2010-16821 Future Fellowship project FT130100195 open access application/pdf Elsevier