黄河上游龙羊峡至积石峡段巨型滑坡OSL测年  

The application of optical stimulate luminescence dating to the study of clustered landslides activity

作　　者：赵瑞欣[1,2] 周保 李滨[1] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]中国地质大学(北京),北京100083 [3]青海省地质环境监测总站,青海西宁810008

出　　处：《地质通报》2013年第12期1943-1951,共9页Geological Bulletin of China

基　　金：青海省自然科学基金项目(批准号:2012-2-936D);国家自然科学基金项目(批准号:41302253);国家科技支撑项目(编号:2006BAC04B02;2012BAK10B01和2012BAK10B02)

摘　　要：通过对青藏高原东部黄河上游龙羊峡-积石峡段10个特大型古滑坡的地质结构、地层岩性的分析，结合各滑坡特征，在特定部位进行采样，归纳整理出滑坡光释光（OSL）测年样品的5种采样方法。选取11个样品应用OSL测年方法，得到各滑坡的年龄数据，分析各样品的可靠性，并探讨其构造时间、气候变化与滑坡群发性之间的关系。研究表明，由于样品来源广泛，实验方法高效准确，OSL方法可成功地应用于滑坡年龄测定，为滑坡研究提供可靠的地质依据。研究区特大型群发性滑坡和初步划分为4期分别为130-110ka、50-30ka、12-9ka和5-3ka，并解释了各期滑坡群发的主要触发因素。Based on the analytical results of 10 large ancient landslides in the aspects of geological structure and stratigraphic lithology, combined with the features of the landslide along Longyang canyon-Jishi canyon in the upper reaches of the Yellow River in eastern Tibetan Plateau, this paper sums up five sampling methods for the landslide OSL dating. OSL dating method was used to measure 11 selected samples for determining chronology of landslide and analyzing the reliability of each sample. The relationship between the clustered landslides activity and the climate change was discussed in this paper. Studies have shown that, as the sources of samples are extensive, the experiment method is highly accurate and effective, and that the OSL method can be effectively applied to the determination of the landslide chronology. It can provides the reliable geological data for the landslide research; the large clusters of landslides in the study area are preliminarily divided into four periods, i.e., 130-110ka, 50-30ka, 12-9ka, and 5-3ka respectively, and the main triggering factors responsible for clustered landslide activities are explained.

关 键 词：OSL测年 黄河上游 滑坡 群发性 气候变化 

分 类 号：P642.22[天文地球—工程地质学] P597.3[天文地球—地质矿产勘探]