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首页> 外文期刊>Quaternary geochronology >A new luminescence chronology for the Mangshan loess-palaeosol sequence on the southern bank of the Yellow River in Henan, central China
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A new luminescence chronology for the Mangshan loess-palaeosol sequence on the southern bank of the Yellow River in Henan, central China

机译：中国河南黄河南部Man山黄土古土壤序列的新发光年表

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An unusually thick loess-palaeosol sequence was found at Mangshan on the southern bank of the Yellow River, central China. Previous attempts to establish its chronology using TL and IRSL techniques have left major uncertainty over the stratigraphic division of the sequence. Here, we report results of a quartz and polymineral luminescence dating study on medium-grain (45-63 mu m) fractions from the upper five loess units of the sequence. The base of the first loess unit is dated to 68.6 +/- 4.9 ka with quartz extracts. While the quartz SAR age for the top of the second loess unit is 87.2 +/- 6.1 ka, the application of an elevated temperature post-IR IRSL (pIR(200)IR(290)) SAR procedure to polymineral fraction from the same sample yields an age of 137 +/- 10 ka. Using this procedure, the upper five loess units are dated. Our new luminescence dates show that the uppermost similar to 41 m loess accumulated during the last glaciation. This disagrees with the previously published luminescence ages but is consistent with the proposed stratigraphy based on the correlation with sections in the Loess Plateau. The accumulation rates of the Mangshan loess during the last two climate cycles are found 4-7 times higher than those in the central Loess Plateau as well as those in the lower part of the sequence. Measurements of quartz OSL/TL sensitivity reveal significant differences among the samples in different loess units, hence providing evidence for the changes in the supply of source materials as a cause for the dramatic acceleration in loess accumulation. (C) 2015 Elsevier B.V. All rights reserved.
机译：在中国中部黄河南岸的芒山发现了异常厚的黄土-古土壤序列。先前使用TL和IRSL技术建立年代学的尝试在该层序的地层划分中留下了很大的不确定性。在这里，我们报告了石英和多矿物发光测年研究的结果，该序列研究了该序列上部五个黄土单元中粒（45-63μm）的馏分。第一个黄土单元的底部日期为68.6 +/- 4.9 ka，带有石英提取物。尽管第二个黄土单元顶部的石英SAR年龄为87.2 +/- 6.1 ka，但对同一样品的多矿物级分应用了红外后IRSL（pIR（200）IR（290））SAR高温程序产生137 +/- 10 ka的年龄。使用此过程，将对上部的五个黄土单元标上日期。我们的新发光日期表明，最上层类似于上一次冰期期间积累的41 m黄土。这与先前公布的发光年龄不同，但与基于黄土高原剖面的相关性的地层学建议相一致。在最后两个气候周期中，shan山黄土的累积速率比中部黄土高原以及序列下部的高4-7倍。石英OSL / TL灵敏度的测量结果表明，在不同的黄土单位中，样品之间存在显着差异，因此为源材料供应的变化提供了证据，这是导致黄土积累急剧加速的原因。 （C）2015 Elsevier B.V.保留所有权利。

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