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Título:
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Single-grain TT-OSL bleaching characteristics: Insights from modern analogues and OSL dating comparisons
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Autores:
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Arnold, Lee ;
Demuro, Martina ;
Spooner, Nigel ;
Prideaux, Gavin ;
McDowell, Matthew Charles ;
Camens, Aaron B. ;
Reed, Elizabeth H. ;
Parés, Josep M. ;
Arsuaga, Juan Luis ;
Bermúdez de Castro, José María ;
Carbonell i Roura, Eudald
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Tipo de documento:
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texto impreso
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Editorial:
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Elsevier, 2018-02-03
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = En prensa
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Materia = Ciencias: Geología: Geología estratigráfica
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Materia = Ciencias: Geología: Paleontología
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Tipo = Artículo
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Resumen:
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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 2?. 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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En línea:
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https://eprints.ucm.es/46862/1/Single-grain%20TT-OSL%20bleaching.pdf
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