Measurement of anomalous fading for feldspar IRSL using SAR
Measurement of anomalous fading for feldspar IRSL using SAR
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DOI：
10.1016/s1350-4487(03)00018-0
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发表时间：
2003-08-01
影响因子：
2
通讯作者：
Huot, S
中科院分区：
文献类型：
--
作者：
Auclair, M;Lamothe, M;Huot, S
在使用多重和单一等分方法对长石矿物进行 IRSL 定年时，通常会观察到年龄低估和广泛的等效古剂量分布。对于漂白良好的沉积物，这被认为主要是由异常褪色引起的。本文介绍了如何评估褪色率（g 值），该褪色率可用于校正测量的光年龄。它还显示了如何使用不同的协议在单等份上获得不同的褪色率。结果发现，延迟 L-i/T-i 测量推导出的 g 值很大程度上取决于预热处理的时间。对于单等分再生剂量方案 (SAR)，如果样品在储存前预热，则使用延迟的 L-i/T-i 比率可以获得最佳结果。 (C) 2003 Elsevier Science Ltd. 保留所有权利。
Age underestimates and wide equivalent paleodose distributions are commonly observed in IRSL dating of feldspar minerals using both multiple and single aliquot methods. For well-bleached sediments, this is thought to be caused primarily by anomalous fading. This article explains how to assess a fading rate (g value), which can be used to correct the measured optical ages. It also shows how different fading rates are obtained on single-aliquots using different protocols. It is,found that the g value deduced from delayed L-i/T-i measurements is strongly dependent on the timing of the preheat treatment. For the single-aliquot regenerative-dose protocol (SAR), best results are obtained using delayed L-i/T-i ratios if the samples are preheated before storage. (C) 2003 Elsevier Science Ltd. All rights reserved.