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Unravelling the Quaternary river incision in the western Rhenish Massif: Cosmogenic nuclide dating (10Be & 26Al) of fluvial terraces in the lower Moselle valley (Germany)

解开莱茵地块西部第四纪河流切口的谜团：宇宙成因核素测年（10Be

基本信息

批准号：
243104380
负责人：
Dr. Gilles Rixhon
金额：
--
依托单位：
Geographisches Institut
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/243104380?language=en
关键词：
Unravelling Quaternary river incision western

项目摘要

Understanding the chronology of Pleistocene river incision in the uplifted Rhenish Massif is of particular importance to unravel the regional tectonic behavior. However, the incision history of major rivers is poorly constrained to date. While many of the previous studies dealt with the reconstruction of terrace profiles in the Rhine and Moselle valleys, very few of them provided reliable age estimates, in particular for middle and early Pleistocene terrace levels. These middle and early Pleistocene terraces, though representing key levels in the morpho- and tectogenetic evolution of the valleys, suffer from a lack of reliable absolute dating. In the framework of this project, we intend to use terrestrial cosmogenic nuclides (10Be, 26Al) to date the upper terrace flight of the lower Moselle valley between Trier and Koblenz. Two distinct sampling/dating approaches, the depth profile technique and the isochron method, will be applied on different terrace levels in order to gain insight into the river incision pulses that governed the progressive entrenchment of the Moselle valley. Moreover, different remnants pertaining to the same terrace group will be sampled at distinct places along this reach of the valley to account for potential spatial variations of incision rates. Thus, the final aim of this research is to enlarge the dataset required to gain insights into the spatio-temporal characteristics of the mechanisms by which river incision responded to combined tectonic forcing (i.e. regional rock uplift) and climatic forcing (i.e. Pleistocene glacial/interglacial cycles).

了解更新世河流在隆起的莱茵地块切割的年代学是特别重要的，以解开区域构造行为。然而，迄今为止，主要河流的下切历史受到的约束很差。虽然许多以前的研究涉及重建阶剖面在莱茵河和摩泽尔河谷，很少有人提供可靠的年龄估计，特别是中，早更新世阶地水平。这些中更新世和早更新世阶地，虽然代表了山谷地貌和构造演化的关键水平，但缺乏可靠的绝对定年。在这个项目的框架内，我们打算使用陆地宇宙成因核素（10 Be，26 Al）的日期较低的摩泽尔河谷特里尔和科布伦茨之间的上阶飞行。两种不同的采样/测年方法，深度剖面技术和等时线方法，将应用于不同的阶地水平，以深入了解河流切割脉冲，控制摩泽尔河谷的渐进式壕沟。此外，属于同一阶地组的不同残留物将在不同的地方进行采样，沿着这一河段的山谷，以解释潜在的空间变化的切割率。因此，本研究的最终目的是扩大所需的数据集，以深入了解河流切割的机制，结合构造强迫（即区域岩石隆起）和气候强迫（即更新世冰期/间冰期循环）的时空特征。