Development of an automatic equipment for the measurement of chemical composition for drilling-cores and its application to climatic analysis

在这项研究中，我们开发了一个非破坏性的荧光X射线沉积物芯扫描仪，命名为“TATSCAN-F1”，与日本电子公司，为研究未解决的几年到十年的时间尺度的气候变化记录在沉积记录。“TATSCAN-F1”基于能量色散荧光X射线分析系统，可对海洋沉积物岩心和陆地薄片和板状样品进行非破坏性、连续、定性和定量的二维元素测量。该仪器在沉积岩芯和沉积岩表面的分辨率为微米级。最大样品尺寸在250 mm长、200 mm宽和100 mm厚的范围内。在最小测量步距为0.03mm左右的情况下，可以对样品表面进行线扫描和映射扫描。该仪器有一个自动聚焦传感器的X射线探测器，小窗口的测量（0.1毫米，0.4毫米，1.9毫米直径），和高分辨率的CCD摄像机检查测量点。连续 ...更多信息 而“TATSCAN-F1”所测的定量资料集，我们无法进行统计分析和谱分析，以准确地讨论气候变化的周期性和振幅调制性。在这项研究中，我们使用“TATSCAN-F1”，分析了来自澳大利亚的太古代条带状铁建造（BIF），来自法国南部的晚白垩世黑色页岩（OAE-1B），以及来自北海道网走湖的全新世沉积岩芯。对BIF试样进行线分析，发现富Si层和富Fe层交替出现。通过成图分析，明确了Si层中P的富集，Fe层中Na、Mg、Ca、Mn、Rb、Sr的富集。对于OAE黑色页岩，在0.1mm厚度范围内，Ca和Al的变化是明确的，对应于富有孔虫纹层和富粘土纹层。网走湖全新世沉积物中，在Al背景变化上检测到几mm ~ 10 mm厚的Si峰。这些峰值对应于湖泊中春季硅藻水华的年变化，因为沉积速率估计为6 mm /年。从这些结果来看，“TATSCAN-F1”有很大的机会为研究沉积岩芯和沉积岩中记录的高频变化开辟一条道路。少

In this study, we have developed a non-destructive fluorescence X-ray sediment core scanner, named "TATSCAN-F1", with JEOL Co. for research of unsolved several year to decadal time-scale climatic changes recorded in sedimentary records. The "TATSCAN-F1" is based on energy-dispersive fluorescence X-ray analysis system, which is for non-destructive, continuous, qualitative, and quantitative 2-dimensional elemental measurement for marine sediment core and terrestrial sheet and slab samples. The instrument has a resolution of micron meter on the surface of sediment core and sedimentary rock. Maximum sample size is in the range of 250 mm long, 200 mm wide, and 100 mm thickness. Line and mapping scanning for surface of sample is able to do in about 0.03mm of minimum measurement step. The instrument has an automated focusing sensor for X-ray detector, small windows of measurement (0.1mm, 0.4mm, 1.9mm in diameter), and high resolution CCD video camera for checking measurement point. Continuous … More and quantitative data sets which are measured by "TATSCAN-F1" are unable us for statistical and spectral analysis to discuss preciously about periodicity and modulation of amplitude of climatic variations. In this study, using the "TATSCAN-F1", we have analyzed Archean banded iron formation (BIF) from Australia, Late Cretaceous black shale (OAE-1B) from south France, and Holocene sediment core from Lake Abashiri in Hokkaido. Alternation of Si-rich layer and Fe-rich layer are clearly detected by line analysis for BIF sample. By mapping analysis, it is clear that P is rich in Si-layer, and Na, Mg, Ca, Mn, Rb, and Sr are rich in Fe-layer. For OAE black shale, variations of Ca and Al in 0.1 mm thickness are definitely detected, which are corresponded to foraminifer-rich lamina and clay-rich lamina. For Holocene Abashiri lake sediment, Si peaks in several mm to 10 mm thickness on Al background variation are detected. These peaks are corresponded to annual variation of spring diatom blooming in the lake, because sedimentation rate is estimated as 6 mm /year in average. From these results, "TATSCAN-F1" has great opportunity to open a way to study high frequency-variation recorded in sediment core and sedimentary rocks. Less