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首页> 外文期刊>Sedimentology: Journal of the International Association of Sedimentologists >Provenance discrimination of fine sediments by mid-infrared spectroscopy: Calibration and application to fluvial palaeo-environmental reconstruction
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Provenance discrimination of fine sediments by mid-infrared spectroscopy: Calibration and application to fluvial palaeo-environmental reconstruction

机译：中红外光谱的细菌辨别细粒度：校准和应用于河流古群环境重建

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摘要

Determining sediment provenance allows a better understanding of fluvial palaeo-dynamics, and identifying involved watersheds, at broad spatio-temporal scales. Conventional approaches for source identification are usually based on the physical, mineralogical, geochemical, magnetic or isotopic properties of sediments. Rapid, non-destructive and, in well-established contexts, highly accurate, mid-infrared spectroscopy is an alternative method for investigating sediment sources. The present research objectives are: (i) to use the mid-infrared spectroscopy method to discriminate the provenance of fine sediments, by applying discriminant analysis on a large set of reference samples from three different watersheds in the Upper Rhine area (associated with the Rhine, Ill and Vosges tributaries); (ii) to clarify whether the provenance spectra signatures are influenced by riverine depositional contexts (bars versus banks) and, to some extent, by grain size and/or high organic matter content; and (iii) to apply the mid-infrared spectroscopy - discriminant analysis method to a study of fluvial palaeo-dynamics and determine the provenance of palaeo-channel infillings. Three main sedimentary sources, divided into eight sub-categories, have been characterized by 196 modern reference samples from 78 collecting sites. Discriminant analysis displayed a strong separating power by classifying correctly the origin of samples without any inter-group overlap, independently from the geomorphological context (bar or bank) and associated slight changes in organic matter contents or grain size. Mid-infrared spectroscopy - discriminant analysis investigations of the palaeo-channel infill, complemented by radiocarbon dates and mineralogical data, allowed reconstructing general trends for the local morpho-sedimentary dynamics over the last ca 12 millennia.
机译：确定沉积物来源可以更好地了解河流古玩动态，并在广泛的时空尺度上识别涉及的流域。源鉴定的常规方法通常基于沉积物的物理，矿物学，地球化学，磁性或同位素性质。快速，无损性，并且在既定的上下文中，高精度的中红外光谱分析是研究沉积物来源的替代方法。目前的研究目标是：（i）通过中红外光谱法来区分细沉积物的出处，通过对来自上莱茵林地区的三种不同流域的大集参考样品进行判别分析（与莱茵河相关联，生病和孚日毒品; （ii）阐明出现谱签名是否受到河流沉积语境（酒吧与银行）的影响，并且在一定程度上受到粒度和/或高有机质含量的影响; （iii）将中红外光谱分析判别分析方法应用于河流古玩动态的研究，并确定古渠道infillings的出处。三个主要沉积来源分为八个子类别，其特点是来自78个收集地点的196个现代参考样品。判别分析通过在没有任何组间重叠的情况下正确分类来显示强大的分离能量，而没有任何组间重叠，独立于地貌上下文（栏或堤），有机物质含量或晶粒尺寸相关的微小变化。中红外光谱 - 帕拉诺渠道筛选的判别分析调查，由RadioCarbon日期和矿物质数据相辅相成，允许在最后一个CA 12千年中重建当地的局部沉积动力学的总趋势。

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