青藏高原东缘鲜水河断裂与龙门山断裂交会区现今的构造活动  

Present-day tectonics activity in the intersection area of the Xianshuihe fault and Longmenshan fault on the eastern margin of the Qinghai-Tibet Plateau

作　　者：唐文清[1] 陈智梁[2] 刘宇平[2] 张清志[2] 赵济湘[2] B.C.Burchfiel R.W.King 

机构地区：[1]西南交通大学 [2]中国地质调查局成都地质矿产研究所 [3]Massachusetts Institute of Technology, Cambridge 02139, Massachusetts, USA

出　　处：《地质通报》2005年第12期1169-1172,共4页Geological Bulletin of China

基　　金：中国地质调查局项目<青藏高原东部现代地壳运动GPS监测>(200313000024);国土资源部<青藏高原东北缘大陆岩石圈现今形变和位移>(2001010203);美国自然科学基金(EAR8904096;EAR9614670;INT9005305)

摘　　要：鲜水河断裂与龙门山断裂交会区具有特殊的构造性质。通过对交会区GPS观测,得到欧亚框架下运动速度场。利用所得的运动速度结果,采用刚性地块假设下的最小二乘法拟合方法,得到川滇、川青、扬子地块运动速度分别为(19.2±2.8)mm/a、(10.7±3.2)mm/a、(9.7±1.6)mm/a,地块运动方向由SE逐渐变成SEE,呈现出顺时针旋卷特征;鲜水河断裂运动速度为(9.3±2.8)mm/a,断裂性质为左旋走滑;龙门山断裂运动速度为(1.2±2.2)mm/a,断裂性质为右旋挤压。The intersection area of the Xianshuihe fault and Longmenshan fault has a special tectonic nature.A velocity field in the Eurasian frame of reference has been obtained by GPS measurements in the intersection area. By estimating the movement velocities of these stations and using a least-square fit under the hypothesis of a rigid body, the modem velocities of the Sichuan-Yunnan, Sichuan-Qinghai and Yangtze block movements are 19.2±2.8 mm/a, 10.7±3.2 mm/a and 9.7±1.6 mm/a respectively and the direction of their movement changes from SE to ESE gradually, indicating the features of clockwise vortex. The velocity of the Xianshuihe fault movement is 9.3±2.8 mm/a and the nature of the fault is left-lateral strike slip and the velocity of the Longmenshan fault is 1.2±2.2 mm/a and the nature of the fault is right-lateral compressive.

关 键 词：青藏高原东缘 断裂交会区 地块运动 断裂活动 GPS 

分 类 号：P542.3[天文地球—构造地质学] P546[天文地球—地质学]