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首页> 外文期刊>Quaternary geochronology >Single-grain TT-OSL bleaching characteristics: Insights from modern analogues and OSL dating comparisons
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Single-grain TT-OSL bleaching characteristics: Insights from modern analogues and OSL dating comparisons

机译：单粒TT-OSL漂白特性：现代类似物和OSL约会比较的见解

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摘要

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.
机译：在天然沉积设置中的热转移光学刺激发光（TT-OSL）信号复位的先前评估基于相对有限的观察结果，并且主要以等效剂量（D-E）分析的多粒度进行。在这项研究中，我们对来自不同沉积环境的一系列现代和地质约会样品进行了一系列单粒TT-OSL漂白评估。在几周内进行的日光漂白实验证实，单粒TT-OSL信号在相对较慢，潜在的变量的情况下光学复位。单粒TT-OSL残留剂量范围为0至24 GY，用于十三个现代样品，具有＆GT;这些样品中的50％产生的加权平均d-e值为0 gy在2a处。单粒OSL和TT-OSL与南澳大利亚袋鼠岛的漂白和异质漂白的晚期更新新生素样本进行比较，收益率一致的复制年龄估计。我们的研究结果表明，与大多数TT-OSL约会应用的自然剂量感兴趣的相比，单粒TT-OSL残留物可能会降低到微不足道的水平; （ii）TT-OSL信号的缓慢漂白性能可能不一定将其约会适用于某些沉积环境; （III）在一些现代样品中的单粒和多粒TT-OSL漂白残留物之间可以观察到非普通差异。统称，这些发现表明，单粒TT-OSL约会可以提供在某些复杂沉积环境中的多粒TT-OSL约会中的优势。

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