金沙江上游特米古滑坡堰塞湖成因与演化  

The origin and evolution of the Temi paleolandslide-dammed lake in the upper Jinsha River

作　　者：陈剑[1] 崔之久[2] 陈瑞琛 郑欣欣 CHEN Jian;CUI Zhijiu;CHEN Ruichen;ZHENG Xinxin(School of Engineering and Technology,China University of Geosciences(Beijing),Beijing 100083,China;College of Urban and Environmental Sciences,Peking University,Beijing 100871,China)

机构地区：[1]中国地质大学(北京)工程技术学院,北京100083 [2]北京大学城市与环境学院,北京100871

出　　处：《地学前缘》2021年第2期85-93,共9页Earth Science Frontiers

基　　金：国家自然科学基金项目(41571012,41230743);国家重点研发计划项目(2018YFC1505003)。

摘　　要：金沙江上游巴塘-中咱河段位于青藏高原东南缘,该河段两岸岸坡发育众多的大型古滑坡,且部分古滑坡曾堵塞金沙江形成了堰塞湖,特米大型古滑坡堰塞湖是其中之一。关于特米古滑坡堰塞湖的形成与演化过程目前尚未见有过详细的报道。本文在野外调查的基础上,结合遥感影像解译和年代学测试,对特米古滑坡堰塞湖的地貌和沉积特征进行了详细研究,并对其形成与演化过程进行了分析。研究结果表明,特米古滑坡堰塞湖很可能是由该地区的古地震活动触发大型滑坡并堵塞金沙江形成的,最大湖面面积约为1.42×10^(7) m^(2),库容蓄水量约为1.46×10^(9) m^(3)。该古堰塞湖的形成时间约为1.8 ka BP,其溃决消亡的时间约为1.4 ka BP,溃决洪峰流量约为55858 m^(3)/s,该滑坡堰塞湖持续稳定了约400年的时间。In the Batang-Zhongza segment of the upper Jinsha River on the southeastern margin of the Tibetan Plateau,major plaeolandslides were widely developed along either bank of the river,some had blocked the river flow to form dammed lakes.The large scale Temi paleolandslide-dammed lake is one of them,however,its origin and evolution have not yet been reported.In this study,we investigated the geomorphology and sedimentology of the Temi paleolandslide-dammed lake through field investigation,remote sensing interpretation and optical stimulated luminescence dating,and analyzed its origin and evolutionary processes.The study results indicated that the Teimi paleolandslide-dammed lake was caused by a major landslide blocking the Jinsha River,triggered by the intensive paleoearthquakes in this area.The maximum lake area and volume were about 1.42×10^(7) m^(2) and 1.46×10^(9) m^(3),respectively.The formation time of this paleolake was~1.8 ka BP,and the time of its breaching was~1.4 ka BP,with a peak discharging of 55858 m^(3)/s,implying that the Temi paleolandslide-dammed lake were stable for about 400 years.

关 键 词：金沙江上游 滑坡堰塞湖 湖相沉积 溃坝堆积 演化过程 

分 类 号：P642.2[天文地球—工程地质学] P694[天文地球—地质矿产勘探]