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，我们与JEOL公司开发了一种非破坏性的荧光x射线沉积物岩心扫描仪，名为“TATSCAN-F1”，用于研究沉积记录中未解决的几年至十年时间尺度的气候变化。“TATSCAN-F1”是基于能量色散荧光x射线分析系统，用于海洋沉积物岩心和陆地片板样品的无损、连续、定性、定量二维元素测量。仪器对沉积物岩心和沉积岩表面的分辨率达到微米级。最大样品尺寸为250mm长，200mm宽，100mm厚。对样品表面进行直线和映射扫描，最小测量步长约为0.03mm。仪器配有自动调焦传感器用于x射线探测器，测量小窗口（直径0.1mm, 0.4mm, 1.9mm），以及用于检查测量点的高分辨率CCD摄像机。由“TATSCAN-F1”所测量的连续的、定量的数据集无法进行统计和光谱分析，无法对气候变化幅度的周期性和调制性进行详尽的讨论。利用“TATSCAN-F1”软件，对澳大利亚太古代带状铁地层（BIF）、法国南部晚白垩世黑色页岩（OAE-1B）和北海道Abashiri湖全新世沉积物岩心进行了分析。通过对BIF样品的线分析，可以清楚地检测到富硅层和富铁层的交替。通过作图分析可知，P富集于si层，Na、Mg、Ca、Mn、Rb、Sr富集于fe层。对于OAE黑色页岩，0.1 mm厚度的Ca、Al含量变化明显，对应于富有孔虫层和富粘土层。全新世basashiri湖沉积物在Al背景变化下检测到厚度在几mm ~ 10 mm之间的Si峰。由于沉积速率平均为6 mm /年，这些峰值对应于湖泊春季硅藻盛开的年变化。从这些结果来看，“TATSCAN-F1”很有可能为研究沉积岩心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