| 全球定位系统测量与青藏高原东部流变构造 |
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| 引用本文： | 陈智梁,刘宇平,张选阳,赵济湘,唐文清,邓昌蓉,B. C. Burchfiel,R. W. King.全球定位系统测量与青藏高原东部流变构造[J].第四纪研究,1998,18(3):262-270. |
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| 作者姓名： | 陈智梁 刘宇平 张选阳 赵济湘 唐文清 邓昌蓉 B. C. Burchfiel R. W. King |
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| 作者单位： | 地质矿产部成都地质矿产研究所!成都，610082，地质矿产部成都地质矿产研究所!成都，610082，地质矿产部成都地质矿产研究所!成都，610082，地质矿产部成都地质矿产研究所!成都，610082，地质矿产部成都地质矿产研究所!成都，610082，地质矿产部成都地质矿产研究所!成都，610082，麻省理工 |
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| 基金项目： | 地质矿产部深部地质项目!85-06-214，美国科学基金!EAR8904096 |
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| 摘 要： | 通过1991～1997年期间高精度全球定位系统测量,建立了青藏高原东部及其邻区的现代地壳运动速度场。相对成都,鲜水河-小江断裂以西的藏东-滇中地区的运动速度变动在1．57～17．49mm／a之间,总体为8mm／a以上。该断裂以东地区的运动速度小,约为0～7mm／a。在此基础上,通过对围绕东喜马拉雅构造结的涡旋和川西地区的涡旋的认定,以及它们在地壳变形中的作用的分析,阐述了青藏高原东部及其邻区深部物质流变的主要形式和地壳流变构造。
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| 关 键 词： | 全球定位系统测量 青藏高原东部 流变构造 |
| 收稿时间： | 1998-04-03 |
| 修稿时间： | 1998-05-30 |
GPS SURVEY AND THE RHEOLOGIC STRUCTURES WITH IN THE EASTERN TIBETAN PLATEAU |
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| Chen Zhiliang, Liu Yuping, Zhang Xuanyang, Zhao Jixiang, Tang Wenqing,Deng Changrong, B. C. Burchfiel ,R.W. King ,L. H. Royden.GPS SURVEY AND THE RHEOLOGIC STRUCTURES WITH IN THE EASTERN TIBETAN PLATEAU[J].Quaternary Sciences,1998,18(3):262-270. |
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| Authors: | Chen Zhiliang Liu Yuping Zhang Xuanyang Zhao Jixiang Tang Wenqing Deng Changrong B C Burchfiel RW King L H Royden |
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| Institution: | 1. Chengdu Institute of Geology and Mineral Resources, Chengdu 610082;
2. Massachusetts Institute of Technology, Cambridge |
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| Abstract: | The crustal inchon of the eastern Tibetan Plateau is the key to understand the collisionand post-collision intracontinental deformation betWeen South China and india, and toresearch the dynamic mechanism and process in Tibetan Plateau.As well-known, the eastern Tibetan Plateau is different from the central TibetMuch of the eastern margin of the Plateau lacks evidence for large-scale young crustalshortening and development of foreland basin, the folds and the thrust faults along theplateau margin are commonly oblique and older than the plateau margin. SinceMiocene,the tectonic frame in the eastern Tibet has been characterized by the wideright-lateral shear zone, which can be subdivided into three units: the weatern beltconsists mainly of a series of NW-trending en echelon right-lateral faults; the centralbelt-a series of NWW-trending en echelon left-latera faults, and the eastern belt-the western margin tectonic belt of the Yangtze block including the Longmenshan faults, the eastern Xianshuihe faults, the Xiaojiang faults, and the Honghe (Red River )faults .Since 1991, a regional GPS netWork has been established along the eastern Tibetan Plateau and its neighbor Sichuan Basin and Yunnan-Guizhou Plateau. The network hasbeen measured at least every two years using multi receivers of dual-frequency instatic relative positioning mode with carrier phase observation . The velocities of thosesites in the Chuan-Dian block and the west of Xianshuihe-Xiaojiang fault aresignificant high,most of them are 5- 10 mm / a relative to Chengdu, in contrast tothe weak movement in the Chuan-Qing and the Yangtze blocks east of the fault.Especially interesting is general clockwise vortex feature of velocity vectors in thesetwo areas. The vortex motion appears to be unrestricted by block boundaries andstrures ; on the contrary, it results in further segmentation within a block and alonga structure . Therefore it is the reflection of rheologic inchon of material in depthrather than those in the upper crust such as a brittle fault slip.Seismic profile research indicates that the thickening of crust in the eastern TibetanPlateau is mainly resulted from the development of lower-velocity layer within themiddle upper crust and the thickening of the lower crust and the contribution of eachof these two processes to the thickening of crust can be as large as 40%. But thedevelOPment of lower-velocity layer is probably an old orogenic process, as indicatedby the fact that most of duchle shear zone in the region is the Miocene or older inage. So, we suggest that the major Process responsible for the young surfacedeformation is a material flow in depth-probably lower crustal flow.The two vortexes structures resulting from the material flow in depth may betentatively named as the Dian -Zang vortex system and the western Sichuan vortexsystem. |
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| Keywords: | GPS survey eastern Tibetan Plateau rheologic structure |
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