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首页> 外文期刊>Quaternary geochronology >OSL chronostratigraphy of a loess-palaeosol sequence in Saxony/Germany using quartz of different grain sizes
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OSL chronostratigraphy of a loess-palaeosol sequence in Saxony/Germany using quartz of different grain sizes

机译：不同粒度的石英在德国萨克森州的黄土古土壤序列的OSL年代地层学

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摘要

Luminescence dating is one of the leading techniques to establish chronologies for loess-palaeosol sequences and has been successfully applied to different minerals and grain size fractions. Using optical stimulated luminescence (OSL) from quartz, we present for the first time a high resolution chronology for the loess section Ostrau in Saxony/Germany. We compare OSL ages derived from two different grain size fractions, coarse (90-200 μm) and the fine grain (4-11 μm) separates. Our results show that the loess section is divided into two parts, separated by a hiatus. OSL samples from the upper part of the loess section show equivalent doses of D _e < 100 Gy. D _e values >180 Gy are observed for the lower part of the loess section. The coarse and fine grain ages agree and also fit to the litho- and pedostratigraphy for the upper part of the profile. For the lower part of the profile the coarse grained quartz OSL is in saturation. The fine grained quartz OSL is not saturated but it appears that the fine grain OSL ages underestimate the sedimentation age. Approaches to explain the D _e differences between the grain size fractions are presented (e.g. post-depositional translocation, dosimetry). A modified SAR protocol for the fine grain fraction produced ages that are in good agreement with expected ages based on litho- and pedostratigraphy. Although further investigations are needed, our results show the suitability of the Saxonian loess belt for OSL dating.
机译：发光测年法是建立黄土古土壤序列年代的主要技术之一，并已成功地应用于不同的矿物和粒度级分。使用来自石英的光激发发光（OSL），我们首次展示了德国萨克森州黄土地区Ostrau的高分辨率年代学。我们比较了OSL年龄，这些年龄来自两个不同的粒度部分：粗颗粒（90-200μm）和细颗粒（4-11μm）。我们的结果表明，黄土部分分为两部分，中间有裂孔。黄土部分上部的OSL样品显示出等效剂量D _e <100 Gy。在黄土部分的下部观察到D _e值> 180 Gy。粗粒年龄和细粒年龄一致，并且也适合剖面上部的岩石地层和古地层。对于型材的下部，粗粒石英OSL处于饱和状态。细粒石英OSL并未饱和，但似乎细粒OSL的年龄低估了沉积年龄。提出了解释晶粒尺寸分数之间的D_e差异的方法（例如沉积后易位，剂量测定）。修改后的SAR协议适用于细粒级分，其生成的年龄与基于岩层和古地层学的预期年龄高度吻合。尽管还需要进一步的研究，但我们的结果表明，萨克森黄土带适用于OSL年代测定。

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