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首页> 外文期刊>Quaternary geochronology >A single-aliquot luminescence dating procedure for K-feldspar based on the dose-dependent MET-pIRIR signal sensitivity
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A single-aliquot luminescence dating procedure for K-feldspar based on the dose-dependent MET-pIRIR signal sensitivity

机译：基于剂量依赖性MET-pIRIR信号敏感性的钾长石单等分发光测年法

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It has been shown previously that the 'sensitivity' of the post-infrared infrared stimulated luminescence (post-IR IRSL or pIRIR) signal-that is, the intensity of the test dose signal (T_x)-can retain a 'memory' of the pre-dose received in nature, but can be reset by sunlight bleaching. Based on this observation, we describe here a single-aliquot regenerative-dose (SAR) multiple elevated temperature (MET) pIRIR dating procedure for K-feldspar that differs in one important respect from the conventional SAR MET-pIRIR procedure. Instead of using a high temperature IR bleaching step between each SAR cycle-as in the conventional procedure-our modified procedure uses a solar simulator bleach for 2 h to reset the dosedependent pIRIR signal sensitivity before each regenerative SAR cycle. We show that the De can be obtained directly from either the T_x signal or the sensitivity-uncorrected signal (L_x) using the modified procedure. Both of these signals saturate at a higher dose than the sensitivity-corrected signal (L_x/T_x) and, hence, can be used to date older sediments than is feasible using conventional IRSL or pIRIR methods.We have tested our new procedure on 10 sediment samples from different regions of Europe (France and Italy) and Asia (China, Georgia and India), including samples with independently known ages of between ~48 and ~470 ka. Based on these external comparisons of age, and on internal (dose recovery) validation tests of the performance of this new pre-dose MET-pIRIR (or pMET-pIRIR) SAR procedure, we conclude that it can potentially measure natural doses of up to w1500 Gy in K-feldspar and produce reliable ages for Late and Middle Pleistocene sediments.
机译：先前已经表明，红外后红外激发的发光（IR后IRSL或pIRIR）信号的“灵敏度”，即测试剂量信号（T_x）的强度，可以保留信号的“记忆”。在自然界中已接受预剂量，但可以通过日光漂白来重置。基于此观察，我们在这里描述了钾长石的单等分再生剂量（SAR）多次高温（MET）pIRIR年代测定方法，该方法在一个重要方面与常规SAR MET-pIRIR方法不同。代替在每个SAR周期之间使用高温IR漂白步骤（如在常规过程中一样），我们的改进程序使用太阳模拟器漂白剂2 h，以在每个再生SAR周期之前重置剂量依赖性pIRIR信号灵敏度。我们表明，使用修改后的过程，可以直接从T_x信号或未校正灵敏度的信号（L_x）中获得De。与灵敏度校正信号（L_x / T_x）相比，这两个信号的饱和剂量都更高，因此，与传统的IRSL或pIRIR方法相比，这些信号可用于确定较旧的沉积物的年代。来自欧洲不同地区（法国和意大利）和亚洲（中国，乔治亚州和印度）的样本，包括独立已知年龄在〜48和〜470 ka之间的样本。基于这些年龄的外部比较，以及对这种新的剂量前MET-pIRIR（或pMET-pIRIR）SAR程序性能的内部（剂量恢复）验证测试，我们得出结论，它可以潜在地测量高达w1500 Gy在钾长石中，为中晚更新世沉积物提供可靠的年龄。

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