| 青藏高原东北缘大陆岩石圈现今变形和位移 |
| |
| 引用本文： | 陈智梁,刘宇平,唐文清,张清志,赵济湘,潘忠习.青藏高原东北缘大陆岩石圈现今变形和位移[J].地质通报,2006,25(1):20-28. |
| |
| 作者姓名： | 陈智梁 刘宇平 唐文清 张清志 赵济湘 潘忠习 |
| |
| 作者单位： | 中国地质调查局成都地质矿产研究所,四川,成都,610082 |
| |
| 基金项目： | 国土资源部重大基础项目（批准号：2001010203）、国家自然科学基金主任基金项目（批准号：40342017）和美国科学基金大陆动力学项目（批准号：EAtL-9614970）~资助部分成果. |
| |
| 摘 要： | 川青地块在地貌上为川西高原，亦是青藏高原东北边缘最重要的构造单元。新的GPS监测资料表明，在欧亚框架内，川青地块及其邻近的龙门山带和华南地块西缘的地壳运动水平速度，具有自西向东由25．66mm／a递变下降到6．99mm／a的总趋势。速度矢量表现出顺时针涡旋转动。川青地块内具有局部应变积累的非均一的区域剪切。横切鲜水河断裂带中段新的GPS量结果揭示，两侧地块间的平均左旋滑动速率约8mm／a；由于局部应变积累，断裂系南西侧的主断裂的移动速率为9．3mm／a，其间为拉分盆地和小的横向伸展断裂。鲜水河断裂系的左旋断裂滑动作用，调节了川青地块与／11滇地块之间的相对运动。
|
| 关 键 词： | 青藏高原东北边缘 GPS监测 川青地块 鲜水河断裂带 区域剪切 脆性形变 |
| 文章编号： | 1671-2552（2006）01-02-0020-09 |
| 收稿时间： | 9/5/2005 12:00:00 AM |
| 修稿时间： | 2005-10-30 |
Recent deformation and displacement of continental lithosphere in the northeastern margin of Qinghai - Tibet Plateau |
| |
| CHEN Zhi-liang,LIU Yu-ping,TANG Wen-qing,ZHANG Qing-zhi,ZHAO Ji-xiang,PAN Zhong-xi.Recent deformation and displacement of continental lithosphere in the northeastern margin of Qinghai - Tibet Plateau[J].Geologcal Bulletin OF China,2006,25(1):20-28. |
| |
| Authors: | CHEN Zhi-liang LIU Yu-ping TANG Wen-qing ZHANG Qing-zhi ZHAO Ji-xiang PAN Zhong-xi |
| |
| Institution: | Chengdu Institute of Geology and Mineral Resources, China Geological Survey, Chengdu 610082, Sichuan, China |
| |
| Abstract: | The Sichuan-Qinghai block, which is geomorphologicaUy the Westem Sichuan Plateau, is the most important tectonic unit on the northeastern margin of the Qinghai-Tibet Plateau. New GPS monitoring data indicate that in the Eurasian flame, the horizontal velocity of the crustal movement in the Sichuan-Qinghai block and its adjacent Longmen Mountain belt and the western margin of the South China block shows a general trend of decreasing progressively from 25.66 to 6.99 mm/a from west to east. The velocity vector shows a clockwise vortex rotation. A regional inhomogeneous shear field with local accumulation of strains occurs within the Sichuan-Qinghai block. The new GPS data along a profile across the central segment of the Xianshuihe fault belt reveal that the average left-lateral slip rate between blocks on both sides of the segment is -8 mm/a. The GPS data also indicate that owing to local accumulation of strains the left-lateral slip motion rate of the main fault along the southwestern margin of the fault system is 9.3 mm/a. Between the two faults, there are a pull-apart basin and a minor transverse extensional fault. The left-lateral slip motion of the Xianshuihe fault system accommodates the relative motion between the Sichuan-Qinghai block and the Sichuan-Yunnan block. |
| |
| Keywords: | northeastern margin of the Qinghai-Tibet Plateau GPS momtoring Sichuan-Qinghai block Xianshuihe fault belt regional shear brittle deformation |
| 本文献已被 维普 万方数据 等数据库收录！ |
| 点击此处可从《地质通报》浏览原始摘要信息 |
| 点击此处可从《地质通报》下载免费的PDF全文 |
