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本次研究通过对黄河上游10处古滑坡采用OSL和~(14)C两种方法测年,总结归纳了6种间接取样测年的思路,即①滑坡体上覆黄土底部、②滑坡体下伏阶地黄土顶部、③滑体内部高温剪切结构面、④堰塞湖湖相层底部、⑤错落式滑坡流水相物质底部和⑥滑坡下伏物质顶部有机碳。通过分析研究发现区内特大型滑坡具有明显的群发分期特性,分别为5万年左右、3万年左右、1.O~0.8万年左右和0.5万年左右。
In this study, the OSL and ~ (14) C dating methods were applied to 10 ancient landslides in the upper reaches of the Yellow River, and six kinds of indirect sampling dating methods were summarized, namely ① the bottom of landslide overlying loess, The top of volcanic terrestrial loess, the high temperature shear structure inside the slide body, the bottom of the dammed lakes and lakes, the bottom of the water-phase material of the run-off landslide and the top of the underlying material of the landslide. Through the analysis and research, it is found that the large-scale landslide in the area has obvious mass staging characteristics of about 50,000 years, about 30,000 years, about 1.0-8,000 years and about 5,0000 years.