Universidad Complutense de Madrid
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Single-grain TT-OSL bleaching characteristics: Insights from modern analogues and OSL dating comparisons

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Arnold, Lee y Demuro, Martina y Spooner, Nigel y Prideaux, Gavin y McDowell, Matthew Charles y Camens, Aaron B. y Reed, Elizabeth H. y Parés, Josep M. y Arsuaga, Juan Luis y Bermúdez de Castro, José María y Carbonell i Roura, Eudald (2018) Single-grain TT-OSL bleaching characteristics: Insights from modern analogues and OSL dating comparisons. Quaternary Geochronology . ISSN 1871-1014 (En prensa)

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URL Oficial: https://www.sciencedirect.com/science/article/pii/S187110141730208X?via%3Dihub



Resumen

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.


Tipo de documento:Artículo
Palabras clave:Luminescence dating, Thermally transferred optically stimulated luminescence (TT-OSL), Single-grain, Modern analogues, Spain, Australia
Materias:Ciencias > Geología > Geología estratigráfica
Ciencias > Geología > Paleontología
Código ID:46862
Depositado:16 Mar 2018 09:37
Última Modificación:11 Dic 2018 08:41

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