| 帕米尔东北缘及塔里木盆地西北部弧形构造的扩展特征 |
| |
| 引用本文： | 沈军,汪一鹏,赵瑞斌,陈杰,曲国胜.帕米尔东北缘及塔里木盆地西北部弧形构造的扩展特征[J].地震地质,2001,23(3):381-389. |
| |
| 作者姓名： | 沈军 汪一鹏 赵瑞斌 陈杰 曲国胜 |
| |
| 作者单位： | 1. 中国地震局地质研究所
2. 中国地震局地质研究所北京 100029 |
| |
| 基金项目： | 攀登项目“现代地壳运动与地球动力学”之“青藏高原岩石圈现今变动与动力学”课题，国家自然科学基金 (4 9834 0 0 5 )、科技部 (969130 70 1)、地震科学联合基金 (95 0 74 38) |
| |
| 摘 要： | 归纳了帕米尔东北缘弧形构造的基本特征 ,分析了塔里木盆地西北部EW向逆断裂背斜带与NNW向隐伏走滑断裂之间的关系。通过塔里木盆地与西南天山和帕米尔东北缘变形特征的对比 ,认为塔里木盆地西北部的变形样式与帕米尔东北缘的弧形构造类似 ,弧形构造具有由帕米尔东北缘向塔里木盆地扩展的特征 ,这种构造是帕米尔向北挤入运动所特有的变形样式
|
| 关 键 词： | 帕米尔 塔里木盆地 弧形构造 |
PROPAGATION OF CENOZOIC ARCUATE STRUCTURES IN NORTHEAST PAMIR AND NORTHWEST TARIM BASIN |
| |
| Shen Jun , Wang Yipeng Zhao Ruibin , Chen Jie Qu Guosheng Seismological Bureau of the Xinjiang Uygur Autonomou Region,Urumqi Institute of Geology,China Seismological Bureau,Beijing.PROPAGATION OF CENOZOIC ARCUATE STRUCTURES IN NORTHEAST PAMIR AND NORTHWEST TARIM BASIN[J].Seismology and Geology,2001,23(3):381-389. |
| |
| Authors: | Shen Jun Wang Yipeng Zhao Ruibin Chen Jie Qu Guosheng Seismological Bureau of the Xinjiang Uygur Autonomou Region Urumqi Institute of Geology China Seismological Bureau Beijing |
| |
| Institution: | Shen Jun 1,2) Wang Yipeng 2) Zhao Ruibin 1,2) Chen Jie 2) Qu Guosheng 2) 1) Seismological Bureau of the Xinjiang Uygur Autonomou Region,Urumqi 830011 2) Institute of Geology,China Seismological Bureau,Beijing 100029 |
| |
| Abstract: | This paper summarizes the basic characteristics of the arcuate structures in northeast Pamir, and analyzes the relationship between the E-W-trending thrust-anticline belts and the NNW-trending buried strike slip faults in northwest Tarim basin. In the northwest of Tarim Basin lie two thrust fault-anticline belts, which are called the Artush-Talanghe and the Kashi-Mingyaole anticline belts, respectively. Even though these two anticline belts are located far away from Pamir but closer to southwest Tianshan, their geometries and histories are similar to those of the external Pamir arcuate structures. By comparing the structures of the anticlines in Tarim basin with those of the southwest Tianshan and northeast Pamir, we find that these arcuate structures are propagating northeastward from Pamir toward the Tarim basin. The deformation in the area between the Pamir and southwest Tianshan is the result of the India-Eurasia collision. The northward indentation of the west Himalayan syntaxis has induced the development of the arcuate structures in Pamir and its fore deep depression basin. The stiff basement of the Tarim basin has also controlled the propagation of deformation. It transferred the tectonic force from Pamir to the area between its north margin and Tian Shan, resulting in intensive deformation of the area. The arcuate structures of the cover layers are thin-skinned structures resulted from crustal shortening of the Tarim basin. The focal depth and geophysical sounding data indicate that the basement of Tarim basin is under-thrusting beneath the south Pamir and south Tianshan. This movement has given rise to the propagation of deformation from the margin toward the inland of the basin. As the deformation is constrained by the orientation of tectonic force, the style of deformation in northwest Tarim basin is therefore similar to that in northeast Pamir. The NNW-trending strike slip faults in the northeast Pamir have also propagated eastward toward the Tarim basin. Most of the faults are buried, along which some strong earthquakes had occurred. It is more likely that these faults were developed in the basement of the Tarim basin. Along with the E-W-trending thrust faults, these strike slip faults have dissected the Tarim basin into several rhombic blocks, the north margins of which is dominated by compressive deformations while the east margin by dextral shearing deformations. Both the north and east margins of the block are seismogenic tectonics. The Jiashi strong earthquake swarms of 1997 and 1998 would be the result of the present-day movement of the arcuate structures in northwest Tarim basin. |
| |
| Keywords: | Pamir Tarim basin Arcuate structures |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
