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首页> 外文会议>Synchrotron and Free electron laser Radiation (conference) >Analysis of the individual annual layers elemental composition in the Lake Kucherlinskoe (Altai) varves sediments with submicron spatial resolution by scanning μ_XRF-SR with x-ray optics (polycapillary lenses)
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Analysis of the individual annual layers elemental composition in the Lake Kucherlinskoe (Altai) varves sediments with submicron spatial resolution by scanning μ_XRF-SR with x-ray optics (polycapillary lenses)

机译：通过用X射线光学扫描μ_XRF-SR（多谱透镜），通过扫描μ_XRF-SR来分析Kucherlinskoe（ALTAIT）中的各个年度层元素组合物的沉积物

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Samples for analysis (optical thin section) were prepared from several core intervals of Lake Kucherlinskoe bottom sediments with well visually distinguished separate annual layers (varves). The annual nature of the layers was previously confirmed by the coincidence of varvechronology (layer counting) with isotopic dating (Cs-137, Pb-210, C-14). The thickness of the annual layers ranged from <1 to 3-4 mm. To study the internal structure of annual layers, we used the scanning μ_XRF-SR with focusing x-ray optics (polycapillary lenses). The experiments were carried out at the Siberian Center for Synchrotron and Terahertz Research (INP SB RAS, Novosibirsk) and the Kurchatov Complex of Synchrotron-Neutron Research (KISI, Moscow) using a confocal X-ray microscope, as well as at the Shanghai Synchrotron Center at the μ_XRF-SR station. The monochromatic excitation energy of 17 and 22 keV was used. The size of the scanning spot was determined by the used focusing polycapillary lenses and amounted to 15-25 microns. The scanning step was 50 or 100 μm. The measurement time was determined by the counting rate and ranged from 10 to 100 seconds per point. Scanning profiles were superimposed on the optical images of the thin section obtained with a high-resolution scanner. Given that the thickness of the thin section is less than 20 μm, a change in elemental composition reflects visual changes in the structure of the bottom sediment. Thus, while tracking visual changes in the structure and elemental composition of individual annual layers, seasonal geochemical features and boundaries between the layers can be distinguished. The obtained changes in the elemental composition made it possible to calculate the annual layers by the found lithological and geochemical indicators of the layer boundaries (Rb / Sr ratio). A geochemical trace of a catastrophic seismic event, the Mongolian earthquake of 1761, was found in the section of bottom sediments.
机译：用于分析（光学薄膜）的样品由kucherlinskoe底部沉积物的几个核心间隔制备，具有良好的视觉和不同的年度层（变化）。以同位素约会的术（CS-137，PB-210，C-14），以先前通过Varvechronology（层计数）的重合确认了层的年度性质。年度层的厚度范围为<1至3-4毫米。为了研究年度层的内部结构，我们使用扫描μ_XRF-SR，具有聚焦X射线光学（多葡萄球镜）。该实验是在西伯利亚同步调节和太赫兹研究中心进行的（INP SB RAS，Novosibirsk）以及使用共焦X射线显微镜以及上海同步rotron的Synchrotron-中子研究（Kisi，Moscow）的Kurchatov复合物。中心位于μ_xrf-sr站。使用17和22keV的单色激发能量。扫描斑点的尺寸由使用的聚焦多百分子透镜测定，并且量为15-25微米。扫描步骤为50或100μm。测量时间由计数率确定，每个点为10到100秒。扫描配置文件叠加在用高分辨率扫描仪获得的薄部分的光学图像上。鉴于薄截面的厚度小于20μm，元素组成的变化反映了底部沉积物结构的视觉变化。因此，在跟踪各个年度层结构和元素组成中的视觉变化，可以区分层之间的季节性地球化学特征和边界。元素组合物中获得的变化使得可以通过所发现的层边界（RB / SR比率）的岩性和地球化学指标计算年度层。灾难性地震事件的地球化学痕迹，1761年的蒙古地震，在底部沉积物部分中发现。

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