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利用热释光断代技术对云南东川泥得坪台地进行地质年代测定,其年代测定结果为9.3～57.1ka,建立了古泥石流台地垂向年龄序列,得到泥得坪古泥石流的时间结构,为恢复古泥石流环境提供年代数据。年代数据显示:泥石流堆积具有不连续性,并出现年代倒转;放射性元素铀、钍、钾可能受当地降雨的影响存在淋溶淀积,年剂量率随深度的增加而增大。
The geochronology of the mud mud plateau in Dongchuan, Yunnan Province was determined by the thermo-luminescence dating technique. The dating of this age was 9.3-57.1 ka, and the vertical age series of the ancient mud-rock flow station was established. The time structure of the mud mudflat was obtained as To restore the ancient debris flow environment to provide chronological data. Chronological data show that the debris flow is discontinuous and the age is reversed. The radioactive elements such as uranium, thorium and potassium may be leached by the local rainfall, and the annual dose rate increases with depth.