古滑坡测年方法与定年精度的提高途径  

Geochronological analysis of fossil landslides and improvement of dating accuracy

作　　者：白世彪 崔鹏[2] 葛永刚[2] 王昊[3] BAI Shibiao;CUI Peng;GE Yonggang;WANG Hao(College of Marine Sciences and Engineering,Nanjing Normal University,Nanjing 210023,China;CAS Key Laboratory of Mountain Hazards and Earth Surface Processes,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China;Institute of Geographic Sciences and Natural Resource Research,Chinese Academy of Sciences,Beijing 100101,China)

机构地区：[1]南京师范大学海洋科学与工程学院,江苏南京210023 [2]中国科学院、水利部成都山地灾害与环境研究所中国科学院山地灾害与地表过程重点实验室,四川成都610041 [3]中国科学院地理科学与资源研究所,北京100101

出　　处：《地学前缘》2021年第2期19-34,共16页Earth Science Frontiers

基　　金：国家自然科学基金项目(41941017,41877522);科学技术部第二次青藏高原综合科学考察研究项目(2019QZKK0902);中国科学院山地灾害与地表过程重点实验室开放基金项目(KLMHESP-17-07)。

摘　　要：明确滑坡每次活动准确的年代对于揭示一个地区滑坡在时间上的活动规律,进而评价该地区的滑坡灾害风险至关重要。本文对宇宙成因核素(TCN)、光释光(OSL)和14 C等古滑坡测年方法研究的现状和成果进行了总结,简要介绍了不同的古滑坡测年方法,重点阐释了滑坡体、次生沉积物、滑动面、滑坡塘、滑坡后壁、滑床以及滑坡伴生堰塞湖等不同的地貌部位和测年介质以及选择不同古滑坡测年方法的局限性与使用条件,并根据目前古滑坡测年存在的问题和难点,探讨了提高古滑坡定年精度的途径。It is extremely useful to identify the ages and recurrence interval of giant fossil landslides for determining the conditions under which landslides occur and assessing landslide risk.It also helps to understand the Quaternary geological history of high mountainous areas.This paper reviews the current progress and achievements in landslide dating using geochronological methods.We introduce the principles and applicability of terrestrial cosmogenic nuclides(TCN),optically stimulated luminescence(OSL),and14C,and discuss their advantages and limitations in landslide studies.We focus on the primary datable landslide materials and geomorphological features,such as the main scarp,sliding surface,slide shoulders,and landslide lakes.Furthermore,aiming at solving current problems in fossil landslide dating,some methods for improving dating accuracy are proposed.

关 键 词：滑坡 年代学 光释光 宇宙成因核素 14 C测年 

分 类 号：P597[天文地球—地球化学] P642.22[天文地球—地质学]