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A new approach towards anomalous fading correction for feldspar IRSL dating - tests on samples in field saturation

机译：长石IRSL测年异常衰落校正的新方法-场饱和样品测试

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摘要

Anomalous fading of the feldspar infrared stimulated luminescence (IRSL) signal hampers possibilities of using feldspar IRSL to obtain burial ages for sediments beyond the dating range of quartz optically stimulated luminescence. Here, we propose a new approach to quantify anomalous fading of the feldspar IRSL signal over geological burial times based on laboratory fading experiments. The approach builds on the description of the quantum mechanical tunnelling process recently proposed by Huntley [2006. An explanation of the power-law decay of luminescence. J. Phys. Condensed Matter 18, 1359-1365]. We show that our methods allow the construction of un-faded and natural IRSL dose-response curves as well as anomalous fading rates in field saturation. The predicted level of field saturation closely approximates the measured saturation level for five samples from fluvial deposits (Lower Rhine) known to be older than 1 Ma. The modelled anomalous fading rate in field saturation (13.4% perdecade) is close to the measured value of 11.2% per decade. These results indicate that the proposed method may allow anomalous fading corrected IRSL dating beyond the linear pan of the IRSL dose-response curve.
机译：长石红外激发发光（IRSL）信号的异常衰落妨碍了使用长石IRSL来获得石英光学激发发光的年代范围以外的沉积物的埋葬年龄的可能性。在这里，我们提出了一种基于实验室衰落实验来量化长石IRSL信号在地质埋藏时间内的异常衰落的新方法。该方法基于Huntley [2006年提出的量子力学隧穿过程的描述。发光的幂律衰减的解释。 J.物理浓缩问题18，1359-1365]。我们表明，我们的方法允许构建不褪色和自然的IRSL剂量响应曲线以及场饱和中的异常衰落率。场饱和度的预测水平非常接近五个河流相矿床（下莱茵河）样品中的5个样品的饱和度水平，已知早于1 Ma。建模的场饱和异常衰落率（十年为13.4％）接近每十年11.2％的测量值。这些结果表明，所提出的方法可以允许超出IRSL剂量响应曲线线性范围的异常衰落校正IRSL日期。

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