Combined IRSL and post-IR OSL dating of Romanian loess using single aliquots of polymineral fine grains
Combined IRSL and post-IR OSL dating of Romanian loess using single aliquots of polymineral fine grains
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DOI：
10.1016/j.quaint.2012.01.002
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发表时间：
2013-04
影响因子：
2.2
通讯作者：
Ş. Vasiliniuc;D. Vandenberghe;A. Timar-Gabor;C. Cosma;P. Haute
中科院分区：
文献类型：
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作者：
Ş. Vasiliniuc;D. Vandenberghe;A. Timar-Gabor;C. Cosma;P. Haute
本文报道了罗马尼亚黄土的持续发光调查使用的样品收集的黄土古土壤序列附近米尔恰沃达（罗马尼亚东南部）。以往利用不同粒度石英（4-11μm和63-90μm）进行的光释光（OSL）研究得出的末次间冰期-冰期旋回年代学存在差异。本文采用双SAR方法，通过多矿物细粒（4-11μm）的红外受激发光（IRSL）和红外后光学受激发光（post-IR OSL）光谱，研究了多矿物细粒的年龄。实验室检测证实了方案对两种信号的适用性。衰落测量表明，一个显着的后红外光释光信号的光散射贡献。总的来说，经衰减校正的红外光释光和后红外光释光年龄结果是一致的，它们与以前报道的细粒石英（4-11μm）的光释光年龄相一致。这种一致性增强了使用发光信号从细粒获得的年龄的可靠性，并允许更有信心的相关性弱发育的古土壤在最上层的黄土单元（L1）与海洋同位素阶段3（MIS 3）。衰减校正年龄低估了沉积年龄的老材料（单位L2-L4），可能是由于校正模型的局限性。
The paper reports on continuing luminescence investigations of Romanian loess using samples collected from the loess-palaeosol sequence near Mircea Vodă (SE Romania). Previous optically stimulated luminescence (OSL) studies using different grain-sizes of quartz (4–11μm and 63–90μm) yielded discrepant chronologies for the last interglacial–glacial cycle. In this study, a double-SAR protocol is used to determine the age of polymineral fine (4–11μm) grains through their infrared stimulated luminescence (IRSL) and post-IR optically stimulated luminescence (post-IR OSL) emissions in the UV. Laboratory tests confirm the suitability of the protocol for both signals. Fading measurements indicate a significant feldspathic contribution to the post-IR OSL signal. In general, the fading-corrected IRSL and post-IR OSL age results are mutually consistent, and they agree with previously reported OSL ages for fine-grained (4–11μm) quartz. This agreement enhances the reliability of the ages obtained using luminescence signals from fine-grains, and allows more confident correlation of the weakly-developed palaeosol in the uppermost loess unit (L1) with marine isotope stage 3 (MIS3). The fading-corrected ages underestimate the depositional age of older material (units L2–L4), probably owing to limitations of the correction model.