Luminescence dating of old (>70 ka) Chinese loess:: A comparison of single-aliquot OSL and IRSL techniques
Luminescence dating of old (>70 ka) Chinese loess:: A comparison of single-aliquot OSL and IRSL techniques
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DOI：
10.1016/j.quageo.2006.05.028
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发表时间：
2007-01-01
影响因子：
2.7
通讯作者：
Van den Haute, P.
中科院分区：
文献类型：
--
作者：
Buylaert, J. P.;Vandenberghe, D.;Van den Haute, P.
研究了两种不同方法在中国古老黄土（> 70 ka）释光测年中的适用性。本文介绍了黄土高原洛川和东川两个地点63-90 μ m石英颗粒的SAR-OSL年龄和4-11 μ m多矿物颗粒的SAR-IRSL年龄。研究了蓝光和红外光激发的发光信号的剂量响应和剂量恢复特性，以及与年龄的关系。此外，从4 - 10 nm的IRSL发射在多矿物细颗粒的异常褪色测量报告。平均值g（2天）相当于类似的3%每十年测量，似乎是独立的网站位置和年龄。洛川样品具有独立的年龄控制（土壤地层学和古地磁学）。在这两个站点，SAR-OSL年龄总是低于SAR-IRSL年龄后，他们已被校正为异常衰落。石英SAR-OSL年龄对较年轻的黄土沉积年龄是准确的，但对60-70 ka前沉积的黄土沉积年龄估计不足。衰减校正的SAR-IRSL年龄与土壤地层年龄控制（类似于75和类似于130 ka）更好地一致，并允许超过石英OSL范围的测年。根据我们的研究结果，我们建议在这些地点的常规SAR-OSL和SAR-IRSL协议应限于样品的年龄分别不超过40-50和100- 120 ka。(c)2006爱思唯尔有限公司保留所有权利。
The applicability of two different approaches in the luminescence dating of old (> 70 ka) Chinese loess is investigated. Both SAR-OSL ages obtained on 63-90 mu m quartz grains and SAR-IRSL ages obtained on 4-11 mu m polymineral grains, for samples collected from two sites in the Chinese Loess Plateau (Luochuan and Dongchuan) are presented. The characteristics of the luminescence signals stimulated by blue and infrared light are investigated in terms of dose response and dose recovery, and as a function of age. Additionally, anomalous fading measurements from the 4 10 nm IRSL emission in polymineral fine-grains are reported. An average value of g(2days) amounting to similar to 3% per decade was measured and seems to be independent of site location and age. For the samples from Luochuan, independent age control (pedostratigraphy and palaeomagnetism) is available. At both sites, the SAR-OSL ages are always lower than the SAR-IRSL ages after they have been corrected for anomalous fading. It seems that the quartz-based SAR-OSL ages are accurate for the younger ages, but that they underestimate the true age of deposition for loess that was deposited about 60-70 ka ago. The fading-corrected SAR-IRSL ages are in better agreement with the pedostratigraphic age control (similar to 75 and similar to 130 ka) and allow dating beyond the quartz OSL range. Based on our results, we suggest that conventional SAR-OSL and SAR-IRSL protocols at these sites should be restricted to samples of ages not exceeding similar to 40-50 and similar to 100-120ka, respectively. (c) 2006 Elsevier Ltd. All rights reserved.