Extending the age limit of quartz OSL dating of Chinese loess using a new multiple-aliquot regenerative-dose (MAR) protocol with carefully selected preheat conditions
Extending the age limit of quartz OSL dating of Chinese loess using a new multiple-aliquot regenerative-dose (MAR) protocol with carefully selected preheat conditions
复制标题
使用新的多等分再生剂量（MAR）协议和精心选择的预热条件，延长中国黄土石英光释光测年的年龄限制
DOI：
10.1016/j.quageo.2020.101144
复制
发表时间：
2021-03
影响因子：
2.7
通讯作者：
Grzegorz Adamiec
中科院分区：
文献类型：
--
作者：
Xulong Wang;Jun Peng;Grzegorz Adamiec
随着单等分再生剂量(SAR)方案的引入，石英上的光激发发光(OSL)测年得到了很好的证实。尽管它被广泛使用，但它有一个主要缺点，即经常低估当量剂量(De)大于~120Gy的样本的年龄。在这项研究中，我们研究了从已知年代的中国黄土中提取的细粒石英。对于这些样本，我们确定使用标准合成孔径雷达方案(即预热和截热温度分别为260GyC和220GyC)获得的DES大大低估了大于100GY的预期埋葬剂量。用天然溶液和漂白溶液研究了预热条件对光致发光强度的影响。自然光致发光强度和再生光致发光强度都随着预热温度的升高而增加，在~260◦C时达到最大值，然后下降。然而，再生的光致发光强度表现出比自然光致发光强度更大的变化。当使用标准的合成孔径雷达方案时，这种变异性的差异不能通过测试剂量的OSL反应来纠正。一种简单的多等份再生剂量(MAR)方案，加上精心选择的预热条件，可以解决自然和随后的再生循环之间灵敏度校正不足的问题。MAR剂量-效应曲线(DRC)的增长与灵敏度校正后的天然OSL信号在~340Gy处有很好的一致性，这使得中国黄土石英OSL样品的年龄上限至少回溯到110ka。
Optically Stimulated Luminescence (OSL) dating on quartz is well established following the introduction of the Single-Aliquot Regenerative-dose (SAR) protocol. Despite its widespread use, it has a major drawback in frequently underestimating the age of samples with equivalent dose (De) larger than ~120 Gy. In this study, we investigate fine-grained quartz extracted from Chinese loess with fairly well known ages. For these samples, we determined that the Des obtained using the standard SAR protocol (i.e., with preheat and cut-heat temperatures of 260 ◦C and 220 ◦C respectively) significantly underestimated the expected burial doses larger than 100 Gy. The dependence of OSL intensity on preheating conditions was investigated using both natural and bleached aliquots. Both the natural and regenerative OSL intensities increase with the preheat temperature to a maximum at ~260 ◦C and decrease afterwards. However, the regenerated OSL intensity demonstrates a greater variability compared to the natural one. This difference in variability could not be corrected by the test dose OSL responses when a standard SAR protocol was used. A simple multiple-aliquot regenerative-dose (MAR) protocol with a carefully selected preheating condition can resolve the problem of inadequate sensitivity correction between the natural and subsequent regenerative cycles. The growth of the MAR dose-response curve (DRC) was in good agreement with the sensitivity-corrected natural OSL signals up to ~340 Gy, which extends the upper age limit of quartz OSL samples of Chinese loess back to at least 110 ka.
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影响因子：
2
作者：
R. Bailey
通讯作者：
R. Bailey
DOI：
--
发表时间：
2017
期刊：
--
影响因子：
--
作者：
Bo Li;Z. Jacobs;R. Roberts;S. Kreutzer;M. K. Murari;M. Frouin;M. Fuchs;A. Singhvi;K. Thomsen-K.-Th
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
单等份再生剂量方案中的光刺激发光产生
影响因子：
2
作者：
Wang X.L.;Wintle A.G.
通讯作者：
Wintle A.G.
影响因子：
2
作者：
A. Timar-Gabor;D. Constantin;J. Buylaert;M. Jain;A. Murray;A. Wintle
通讯作者：
A. Timar-Gabor;D. Constantin;J. Buylaert;M. Jain;A. Murray;A. Wintle
影响因子：
2
作者：
V. Pagonis;A. Wintle;Reuven Chen
通讯作者：
V. Pagonis;A. Wintle;Reuven Chen