稀土元素聚类分析方法在物源示踪方面的应用

Application of rare earth element in the study of provenance analysis

为解决鄂尔多斯盆地华庆地区延长组长6段的物源问题,引入聚类分析方法.通过研究长6段砂岩的稀土元素特征和聚类分析,确定了该区的物源方向.稀土元素特征表明:配分曲线与上地壳稀土元素的分布形态几乎完全一致,与下地壳和洋壳的特征相差甚远,说明其陆源碎屑物质应来源于上地壳.聚类分析结果认为该区主要物源有北东方向,北东东方向和正北方向三个物源,与鄂尔多斯盆地古地理背景一致.

To solve the provenance issue of Huaqing region Chang6 in Ordos Basin, the material source was determined through the study of the rare earth element characteristic of Chang6 sand and the cluster analysis method. The rare earth element characteristic showed that distribution plots were consistent with distribution patterns of the rare earth element from the upper crust, and different from the characteristic of the lower crust and oceanic crust. It illustrated terrestrial fragments originated from the upper crust. The results of the cluster analysis indicate that main sources had the northeast, east northeast and due north direction, which were consistent with the paleogeographic settings of Ordos Basin.