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OSL dating of flood sediments in the North China Plain

机译：华北平原洪水沉积物的OSL约会

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摘要

Partial bleaching is a major challenge in OSL (Optically Stimulated Luminescence) dating of flood sediments. Here we investigated both modern and palaeoflood sediments in the North China Plain. It demonstrates that most of the OSL ages for either coarse-grained (CG) or fine-grained (FG) quartz were overestimated in different levels. In the clay-dominated flood deposits, OSL signals of FG quartz from samples at the top of each layer can be bleached to a lower level and therefore give relatively accurate ages. While in silt-dominated flood sediments, the ages of FG quartz are significantly older than those of CG quartz. Ages obtained using the Minimum Age Model (MAM) for CG quartz are the closest to the burial ages of sediments, and the overestimation is mostly in the range of 0.5-1 ka. Although the FG quartz in silt sediments are not suitable for OSL dating the flood events, the OSL ages of FG quartz changes accordingly to the particle-size changes within each silt-dominated layer. The lager the particle sizes are; the older the OSL ages of FG quartz are. The OSL ages of CG quartz are corresponds in an opposite way. It can help to identify floods deposits. Furthermore, the differences of residual OSL ages of FG quartz in different layers in flood sediments may provide more depositional information.
机译：部分漂白是OSL（光学刺激的发光）洪水沉积物的主要挑战。在这里，我们调查了华北平原的现代和古品沉积物。它表明，粗粒（CG）或细粒（FG）石英的大多数OSL年龄在不同水平中高估。在粘土主导的洪水沉积物中，可以将来自每层顶部的样品的FG石英的OSL信号漂白到较低水平，因此给出相对准确的年龄。在淤泥主导的洪水沉积物中，FG石英的年龄明显大于CG石英。使用CG石英的最低年龄模型（MAM）获得的年龄最接近沉积物的埋藏年龄，高估大部分在0.5-1 ka的范围内。虽然淤泥沉积物中的FG石英不适合于欧姆的OSL，但FG石英的OSL年龄相应地变化为每个淤泥主导层内的粒度变化。粒度尺寸; FG石英的OSL年龄越旧。 CG石英的OSL年龄以相反的方式对应。它可以帮助识别洪水存款。此外，洪水沉积物中不同层中FG石英的残留OSL年龄的差异可以提供更多的沉积信息。

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