Multi-method geochronological approach to reconstruct post-1800 floodplain sedimentation in the upper Rhine plain, France

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-06-13 DOI:10.1016/j.quageo.2024.101561

Cassandra Euzen , François Chabaux , Gilles Rixhon , Frank Preusser , Frédérique Eyrolle , Valentin Chardon , Anja M. Zander , Dominique Badariotti , Laurent Schmitt

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Abstract

The precise dating of sedimentary archives covering the last 200 years in floodplains massively impacted by human activities is a major challenge. A combination of geochronological approaches is necessary to accurately date post-1800 sedimentary deposits. Here, we use a combination of a wide range of methods to unravel floodplain sedimentary dynamics, through the example of the Upper Rhine which is a highly regulated river. This comprises short--lived radionuclides (¹³⁷Cs, ²¹⁰Pb_xs) and Infrared Stimulated Luminescence (IRSL) single-grain dating. Luminescence profiling methods (IRSL screening, portable luminescence reader) were also used to further characterise sedimentation dynamics. These were combined with a hydrogeomorphological approach based on historical planimetric and hydrological data, the knowledge of engineering works as well as the morpho-sedimentary adjustments they induced. Our study demonstrates the value of historic maps as well as historical hydrological data, which provide precise time markers for dating the sedimentary archive under study. We illustrate different assumptions, validity domains and limitations inherent to each method, especially the complexity of ¹³⁷Cs to date floodplain sediments and the potential of luminescence methods for dating and estimating sedimentation continuity. We finally show the advantage of combining geochronological approaches in the construction of robust age models for young floodplain sedimentary archives in highly anthropized fluvial environments.

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采用多种地质年代方法重建法国上莱茵平原 1800 年后的洪泛区沉积作用

对受人类活动严重影响的洪泛区过去 200 年的沉积档案进行精确定年是一项重大挑战。要准确测定 1800 年后沉积物的年代，必须结合多种地质年代方法。在这里，我们将多种方法结合起来，通过莱茵河上游的例子来揭示洪泛区的沉积动态。其中包括短寿命放射性核素（137Cs、210Pbxs）和红外激发发光（IRSL）单粒测年法。此外，还采用了发光剖面分析方法（IRSL 筛选、便携式发光阅读器）来进一步确定沉积动力学特征。这些方法与基于历史平面测量和水文数据的水文地质方法、工程知识及其引起的形态沉积调整相结合。我们的研究证明了历史地图和历史水文数据的价值，它们为所研究的沉积档案的年代提供了精确的时间标记。我们说明了每种方法固有的不同假设、有效域和局限性，尤其是 137Cs 在确定洪泛沉积物年代方面的复杂性，以及发光方法在确定年代和估计沉积连续性方面的潜力。最后，我们展示了在高度人类化的河流环境中，结合地质年代方法构建年轻洪积平原沉积档案的可靠年龄模型的优势。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.