东昆仑活动断裂带玛曲段活动特征及其东延  

Characteristics of the activity of the Maqu segment of the East Kunlun active fault belt and its eastward extension.

作　　者：马寅生[1] 施炜[1] 张岳桥[1] 杨农[1] 张春山[1] 张会平[1] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081

出　　处：《地质通报》2005年第1期30-35,共6页Geological Bulletin of China

基　　金：中国地质调查局<黄河上游新构造运动与地壳稳定性调查研究>(编码:200012400103);国土资源部重点基础科技项目<中国东西部地貌边界带新构造运动及其对环境分异的影响>(编号:20010202)的阶段性成果。

摘　　要：东昆仑活动断裂是青藏高原东北缘一条重要的NWW向边界断裂。通过野外观测和遥感解译,发现东昆仑活动断裂带玛曲段主要由玛曲、迭部-武都和迭山-舟曲3条左阶斜列的活动断裂组成。该断裂带晚第四纪的活动性非常强烈,晚更新世晚期以来的平均左旋走滑运动速率达(10.15±0.34)mm/a,与该断裂带在西大滩、东大滩、花石峡和玛沁等地的运动速率基本相同,说明东昆仑活动断裂带延伸到玛曲段并没有逐渐消亡,而是继续向东延伸,最终与秦岭南缘活动断裂相接。The East Kunlun active fault is an important WNW-trending boundary fault on the northeastern margin of the Qinghai-Tibet Plateau. Based on field observations and remote sensing interpretation, it is found that the Maqu segment of the East Kunlun active fault belt consists predominantly of the Maqu, Têwo-Wudu and Dieshan-Zhgqu sinistral strike-slip active faults, which were very active in the Late Quaternary. The average of its sinistral strike-slip movement since the late part of the late Pleistocene is up to 10.15±0.34 mm/a, which is about the same as that at Xidatan, Dongdatan, Huashixia and Maqên. It shows that after the East Kunlun active fault belt extends to the Maqu segment it is not extinguished but continues to extend eastward and finally is connected with the South Qinling marginal active fault.

关 键 词：青藏高原 东昆仑活动断裂带 玛曲活动断裂 晚更新世 

分 类 号：P542.3[天文地球—构造地质学]