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首页> 外文期刊>Journal of quaternary science: JQS >High-resolution X-ray fluorescence core scanning analysis of Les Echets (France) sedimentary sequence: New insights from chemical proxies
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High-resolution X-ray fluorescence core scanning analysis of Les Echets (France) sedimentary sequence: New insights from chemical proxies

机译：Les Echets（法国）沉积层序的高分辨率X射线荧光岩心扫描分析：来自化学代理的新见解

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The Les Echets sediment sequence has recently been the subject of a high-resolution, multi-proxy study which revealed shifts in lake productivity linked to Greenland stadials and interstadials over the last 40 ka (Wohlfarth et al., 2008. Rapid ecosystem response to abrupt climate changes during the last glacial period in western Europe, 40-16 ka. Geology 36: 407-410). Here we present new elemental data for this sequence as acquired using an X-ray fluorescence core scanning system which provides in situ high-resolution, continuous, multi-element analyses. It was found that the strength of associations between the studied elements (Ti, Rb, K, Zr, Si, Ca, Sr, Mn and Fe) varied over time with changes in lake status which are ultimately driven by changes in climate. Increases in fine-grained, detrital input (as indicated by Ti, Rb, K and Zr/Rb) overlap with independently established periods of lower lake productivity and are interpreted to represent more arid conditions. Several of these arid periods are coincident with low diatom concentrations and the timing of Heinrich events H4, H3 and H2. The duration of the environmental impacts linked to the H events varied by proxy with elemental data (Ti and Zr/Rb) estimating shorter events than the diatom data. Periods of lower detrital input and coarser grain sizes agreed in time with periods of higher lake productivity. The elemental data provide new insights into hydrological changes and related sediment processes within the catchment, and highlight the need for multi-element and multi-proxy approaches when reconstructing climate change using lacustrine sediment sequences.
机译：Les Echets沉积物序列最近成为一项高分辨率，多代理研究的主题，该研究揭示了过去40 ka内与格陵兰岛陆缘和陆间缘相关的湖泊生产力的变化（Wohlfarth等人，2008。生态系统对突变的快速响应西欧末次冰河时期的气候变化，40-16 ka。地质36：407-410）。在这里，我们介绍了使用X射线荧光核心扫描系统获取的该序列的新元素数据，该系统可提供原位高分辨率，连续，多元素分析。结果发现，被研究元素（Ti，Rb，K，Zr，Si，Ca，Sr，Mn和Fe）之间的缔合强度随时间的变化而变化，而湖泊状态的变化最终是由气候变化驱动的。细粒碎屑输入（如Ti，Rb，K和Zr / Rb所示）的增加与较低的湖生产力独立建立的时期重叠，并被解释为代表更干旱的条件。这些干旱时期中有几个与低硅藻浓度和Heinrich事件H4，H3和H2的发生时间相吻合。与H事件有关的环境影响持续时间因元素数据（Ti和Zr / Rb）的替代值而变化，这些元素数据估计比硅藻数据短。较低的碎屑投入时间和较粗的晶粒尺寸时期与较高的湖泊生产力时期相吻合。元素数据提供了有关流域内水文变化和相关沉积过程的新见解，并强调了在利用湖相沉积序列重建气候变化时，需要采用多元素和多代理方法。

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