Landscape instability at the end of MIS 3 in western Central Europe: evidence from a multi proxy study on a Loess-Palaeosol-Sequence from the eastern Lower Rhine Embayment, Germany
Landscape instability at the end of MIS 3 in western Central Europe: evidence from a multi proxy study on a Loess-Palaeosol-Sequence from the eastern Lower Rhine Embayment, Germany
复制标题
DOI：
10.1016/j.quaint.2017.09.008
复制
发表时间：
2017-09
影响因子：
2.2
通讯作者：
P. Fischer;U. Hambach;N. Klasen;P. Schulte;C. Zeeden;F. Steininger;F. Lehmkuhl;Renate Gerlach;U. Radtke
中科院分区：
文献类型：
--
作者：
P. Fischer;U. Hambach;N. Klasen;P. Schulte;C. Zeeden;F. Steininger;F. Lehmkuhl;Renate Gerlach;U. Radtke
下莱茵河湾是西欧黄土带内重要的黄土-古土壤-层序（LPS）的发源地，为景观演化和古气候动力学提供了有价值的信息。本研究以下莱茵河湾（Düsseldorf-Grafenberg）东肩的一个沉积物（LPS）为基础，重点研究了该地区的古环境演变。在研究区域内的古环境发展的高分辨率粒度分析的基础上，选定的环境磁性参数，并辅以发光年龄估计的地球化学分析和讨论。粒度分布（ΔGSD）和U比的差异清楚地反映了LPS内的主要地层单元。此外，对沉积后粒度变化敏感的ΔGSD（ΔGSDclr）的中心对数比转换跟踪了强化土壤形成的单元。尽管没有磁性增强可以观察到的Grafenberg LPS内，环境磁性参数结合选定的地球化学分析（Sr/Rb）提供直接的信息，在成土和成岩过程中的硅酸盐和磁性矿物的修改。总的来说，格拉芬贝格LPS有助于了解下莱茵河湾的环境条件，特别是在MIS 3晚期和向MIS 2过渡期间。LPS反映了地貌系统的重大变化，与来自不同档案和西北欧不同地理区域的古环境记录相比，表明与末次冰期北大西洋气候振荡有直接关系。结果表明，Hesbaye不整合（在MIS 3/2边界）是绑定到一个侵蚀事件，这可以追溯到广泛的地区内的北方欧洲黄土带。
The Lower Rhine Embayment hosts important Loess-Palaeosol-Sequences (LPS) within the western European loess belt yielding valuable information on landscape evolution and palaeoclimatic dynamics. The study focusses on the palaeoenvironmental development based on a LPS from the eastern shoulder of the Lower Rhine Embayment (Düsseldorf-Grafenberg). The palaeoenvironmental development within the study area is presented and discussed based on high-resolution grain size analyses, selected environmental magnetic parameters, and geochemical analyses complemented by luminescence age estimates. Differences in grain size distribution (ΔGSD) as well as the U-ratio clearly reflect main stratigraphical units within the LPS. In addition, the centered-log-ratio transformation of ΔGSD (ΔGSDclr), which is sensitive to post-depositional grain size variations, traces units of intensified soil formation. Despite no magnetic enhancement can be observed within the Grafenberg LPS, environmental magnetic parameters combined with selected geochemical analyses (Sr/Rb) provide direct information on the modification of silicates and magnetic minerals in the course of pedogenesis and diagenesis. Overall, the Grafenberg LPS contributes to the understanding of environmental conditions within the Lower Rhine Embayment particularly for the late MIS 3 and the transition to MIS 2. The LPS reflects major shifts in the geomorphic system, which are compared to palaeoenvironmental records from different archives and different geographic regions in north-western Europe indicating a direct relation to North Atlantic Climate oscillations during the last glacial period. It is shown that the Hesbaye unconformity (at the MIS 3/2 boundary) is bound to an erosional event, which can be traced over wide areas within the northern European loess belt.