Luminescence Sensitivity of Rhine Valley Loess: Indicators of Source Variability?
Luminescence Sensitivity of Rhine Valley Loess: Indicators of Source Variability?
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DOI：
10.3390/quat5010001
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发表时间：
2021-12
期刊：
影响因子：
2.3
通讯作者：
K. Fitzsimmons;Zoran M. Perić;Maike Nowatzki;S. Lindauer;M. Vinnepand;C. Prud’homme;A. K. Dave
中科院分区：
文献类型：
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作者：
K. Fitzsimmons;Zoran M. Perić;Maike Nowatzki;S. Lindauer;M. Vinnepand;C. Prud’homme;A. K. Dave
黄土为过去的环境条件提供了宝贵的陆地记录，包括负责沙尘输送的空气质量循环的动力学和轨迹。在这里，我们探讨的变化，沉积石英和长石的发光灵敏度特性作为可能的工具，确定源的变化了黄土-古土壤序列（LPS）。发光敏感性是一种快速测量的指标，它是物源岩性与石英或长石碎屑历史相互作用的产物。因此，下剖面敏感性的变化可能反映了沉积物物源的变化以及其他因素，如通过成土作用的风化作用。我们进行了实证调查的发光灵敏度的石英和长石从不同的粒度级从Schwalbenberg LPS在德国莱茵河山谷。我们比较样品从一个30米的核心跨越最后一个完整的冰期周期与样品的氧同位素阶段（OIS）3-2年龄暴露在附近的配置文件。我们发现石英和长石的敏感性之间的整体反比关系，以及不同的石英粒度之间的敏感性的变化。统计分析得出未处理沉积物的IR 50敏感性与粘土含量、长石敏感性与岩心Si/Al比值之间存在显著相关性。由于硅/铝比可能表明种源的变化，后者的相关性表明，IR 50测量未经处理的样品可用于提供一个可靠的，快速的扫描源的变化超过千年的时间尺度。
Loess provides a valuable terrestrial record of past environmental conditions, including the dynamics and trajectories of air mass circulation responsible for dust transport. Here we explore variations in the luminescence sensitivity characteristics of sedimentary quartz and feldspar as possible tools for identifying changes in source down a loess-palaeosol sequence (LPS). Luminescence sensitivity is a rapidly measurable index which is the product of interplay between source lithology and the history of the quartz or feldspar clasts. Variations in sensitivity of down profile may therefore reflect changes in sediment provenance as well as other factors such as weathering through pedogenesis. We undertake an empirical investigation of the luminescence sensitivity of quartz and feldspar from different grain-size fractions from the Schwalbenberg LPS in the German Rhine valley. We compare samples from a 30 m core spanning the last full glacial cycle with samples of oxygen isotope stage (OIS) 3–2 age exposed within nearby profile. We find an overall inverse relationship between quartz and feldspar sensitivity, as well as variability in sensitivity between different quartz grain sizes. Statistical analyses yield a significant correlation between IR50 sensitivity from unprocessed sediments and clay content, and feldspar sensitivity and Si/Al ratios down the core. Since Si/Al ratios may indicate changes in provenance, the latter correlation suggests that IR50 measurements on unprocessed samples may be used to provide a reliable, rapid scan of source variability over millennial timescales.