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西藏地区重磁场特征及藏东构造格局新认识
引用本文:熊盛青,丁燕云,李占奎.西藏地区重磁场特征及藏东构造格局新认识[J].地质论评,2012,58(2):201-207.
作者姓名:熊盛青  丁燕云  李占奎
作者单位:1. 中国国土资源航空物探遥感中心,北京,100083
2. 中国国土资源航空物探遥感中心,北京,100083
3. 中国国土资源航空物探遥感中心,北京,100083
基金项目:本文为地质调查项目“中国陆域航磁特征及地质构造研究”(编号基\[2011\]022106)的成果
摘    要:根据新编制的1∶100万西藏地区重磁图发现,在西藏东部雁石坪—昌都地区存在一组北西向构造,它与西藏中西部发育的近东西向构造呈相交而不是相接关系,这与地质上通常认为的西藏地区主体呈北西—东西—北西西向的平卧"S"型构造格局观点相异,从而对西藏地区东部的地质构造格局有了新的认识。文中清晰地展示了这组北西向构造及近东西向构造的重磁场面貌,并推测认为这组北西向构造可能是从祁连山—东昆仑山北西向构造中沿东昆仑断裂分裂出来的,而先前认为的北西向构造与近东西向构造相接的观点反映的应是侏罗纪之后受印度地块向北推挤,上覆浅层构造特征,这个新发现对认识西藏地区地质构造格局具有重要意义。

关 键 词:北西向构造  近东西向构造  相交关系  重磁场特征  西藏  雁石坪—昌都地区

Characteristics of Gravity and Magnetic Field in Xizang(Tibet) and New Understanding on Tectonic Framework in Eastern Xizang
XIONG Shengqing , DING Yanyun , LI Zhankui.Characteristics of Gravity and Magnetic Field in Xizang(Tibet) and New Understanding on Tectonic Framework in Eastern Xizang[J].Geological Review,2012,58(2):201-207.
Authors:XIONG Shengqing  DING Yanyun  LI Zhankui
Institution:China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing,100083
Abstract:Studying on the new complied 1∶100 million magnetic and gravity map, writers find there are a group of northwest directional structures in Yanshiping—Chamdo area, eastern Xizang(Tibet), which are intersecting with the nearly east—west directional structures developed in the central—western Xizang(Tibet), rather than connecting with them. This view is different from common realization in geology field that the structures in Xizang(Tibet) mainly appear NW—EW—NWW direction lying down like "S". Based on the new findings, furthermore, writers have achieved some new understandings about the tectonic framework in eastern Xizang area. In this paper, writers clearly show the gravity and magnetic characteristics of the northwest directional structures and nearly east—west directional structures, and infer that the northwest directional structures could be split from the Eastern Kunlun fault, Qilian—East Kunlun Mountains, while the previous view that the northwest directional structures connect with nearly east—west directional structures reflects the overlying epi-tectonic caused by India plate shoving to the north after Jurassic. This discovery has very important significances for the understanding of the tectonic framework of Xizang(Tibet).
Keywords:NW structure  near EW structure  intersection relations  gravity and magnetic characteristics  Yanshiping—Chamdo area  eastern Xizang(Tibet)
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