An improved multiple-aliquot regenerative-dose (MAR) procedure for post-IR IRSL dating of K-feldspar
An improved multiple-aliquot regenerative-dose (MAR) procedure for post-IR IRSL dating of K-feldspar
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发表时间：
2017
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通讯作者：
Bo Li;Z. Jacobs;R. Roberts;S. Kreutzer;M. K. Murari;M. Frouin;M. Fuchs;A. Singhvi;K. Thomsen-K.-Th
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作者：
Bo Li;Z. Jacobs;R. Roberts;S. Kreutzer;M. K. Murari;M. Frouin;M. Fuchs;A. Singhvi;K. Thomsen-K.-Th
在光学测年中，多等分测年法被认为不如单等分测年法，这是由于等分间归一化的固有困难。在这项研究中，我们提出了一个改进的多等分再生剂量（MAR）程序的多个高温后红外IRSL（MET-pIRIR）信号从钾长石颗粒。该方法基于以下观察结果：相同和不同样品的不同等分试样之间存在共同的或标准化的生长曲线（SGC），并且等分试样之间的变异可以通过应用再生剂量（“再归一化”）或最小二乘（LS）归一化程序在很大程度上消除。我们发现，这种改进的MAR程序显着提高了De测定的准确度和精密度。我们使用希腊中更新世考古遗址Marathousa的几个沉积物样品测试了这种方法，并证明，对于来自这些样品的钾长石颗粒，所提出的MAR方法比SAR方法更有效地克服了在低刺激温度（50 - 150 ℃）下对天然（Ln）和测试剂量（Tn）信号进行不适当的灵敏度校正的问题。MAR方法还可以减少仪器测量较旧样品的时间。
In optical dating, multiple-aliquot dating methods have been considered inferior to single-aliquot methods, due to difficulties inherent to in between-aliquot normalisation. In this study, we propose an improved multiple-aliquot regenerative-dose (MAR) procedure for the multiple-elevated-temperature post-IR IRSL (MET-pIRIR) signals from K-feldspar grains. This method is based on observations that a common, or standardised, growth curve (SGC) exists between different aliquots from the same and different samples, and that between-aliquot variation can be largely eliminated by application of regenerative-dose (’re-normalisation’) or least squares (LS) normalisation procedures. We find that this improved MAR procedure significantly increases the accuracy and precision of De determinations. We tested this method using several sediment samples from Marathousa, a Middle Pleistocene archaeological site in Greece, and demonstrate that, for the K-feldspar grains from these samples, the proposed MAR method overcomes problems associated with inappropriate sensitivity correction of the natural (Ln) and test dose (Tn) signals at low stimulation temperatures (50 – 150 ◦C) more effectively than the SAR method. The MAR method can also reduce instrument time for measurement of older samples.