Testing the potential of a low temperature feldspar luminescence dating approach using yellow stimulation

可靠的测年方法对于研究过去气候和古环境变化的时间至关重要。发光测年通常用于为陆地沉积物档案建立年代框架，所谓的pIRIR协议，其中长石信号在耗尽IR 50信号后在升高的温度下被激发，主要用于测定已经饱和或通常有问题的石英发光信号的沉积物。 这些升高的温度测量通常显示没有或可忽略不计的衰落，但例如剂量残留可能会出现问题，并导致年龄高估，这与全新世或上更新世沉积物尤其相关。通过我们的研究活动，我们的目标是测试在低温下测量的后IR黄色刺激长石信号的潜力，以更好地克服诸如高剂量残留或不必要的热传递等问题。我们的假设是获得一个稳定的长石发射，引导电子通过一个亚导带水平。对该方法的第一项研究，其中在50°C下测量黄色激发长石信号，然后进行IR漂白（以下称为pIR-YOSL），表明pIR-YOSL信号似乎非常有希望确定第四纪沉积物的年代。因此，我们现在想要系统地研究黄色受激信号的发射光谱、信号稳定性、饱和度和可漂白性。此外，我们计划测试一组样本的时序控制，从中更新世到最近的年龄跨度的协议。

Robust dating methods are crucial to study the timing of past shifts in climate and palaeoenvironment. Luminescence dating is often used to establish chronological frameworks for terrestrial sediment archives and so called pIRIR protocols, in which the feldspar signal is stimulated at elevated temperatures after depleting the IR50 signal, are mostly applied to date sediments yielding an already saturated or generally problematic quartz luminescence signal. These elevated temperature measurements often show no or negligible fading but e.g. dose residuals can be problematic and lead to age overestimation what is especially relevant for Holocene or Upper Pleistocene sediments. With our research-campaign we aim at testing the potential of a post-IR yellow stimulated feldspar signal measured at low temperatures to better overcome problems such as high dose residuals or unwanted thermal transfer. Our hypothesis is to obtain a stable feldspar emission, which guides electrons via a sub-conduction band level. First studies on the approach, in which the yellow stimulated feldspar signal is measured at 50°C following an IR-bleach (named hereafter pIR-YOSL), show that the pIR-YOSL signal seems very promising to date Quaternary sediments. Therefore, we now want to systematically study the yellow stimulated signal in terms of emission-spectra, signal stability, saturation and bleachability. Furthermore we plan to test the protocol on a set of samples for which chronological control is available and spanning from Middle-Pleistocene to recent age.