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《Chinese Journal of Geophysics》 2013-04
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The feature of tectonics in the Tibet Plateau from new regional gravity signals

ZHANG Yan1,2,CHENG Shun-You1,ZHAO Bing-Kun2,DONG Yun-Peng1, HAN Ge-Ming3,ZHANG Ming-Hua4,YANG Ya-Bin3,CUI Li-Yan2 1 State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University Xi′an 710069,China 2 The Second Geophysical Exploration Brigade,Bureau of Geology and Minerals of Shanxi Province,Xi′an 710069,China 3 Institute of Geophysical and Geochemical Exploration,CAGS,Hebei Province Langfang 100010,China 4 Research Center of China Geological Survey Development,Beijing 100037,China  
As of 2007,1:1000000 regional gravity investigations have been completed in Qinghai-Tibet Plateau.We obtain useful information by analyzing the gravity anomaly in different depth levels of the plateau,based on various data processing results to build a structure model.Our results show that the gravity feature in Tibet is unique,with diverse contact relations with adjacent blocks.The gravity minimum and maximum can be related to the arc-basin and magmatic belts,and suture zones where amphibolites were found.This feature above shows that Tibet is pieced together with many sutures.The gravity field is divided into two parts of the southern and northern within the plateau in different depth by the Bouguer gravity anomaly of Bangong-Nujiang suture zone,which is the most important gravity maximum anomalies over 1000 km long.This information provides evidence that Bangong-Nujiang suture is the northern boundary of Gondwana.Local gravity anomaly exhibits similar feature of geotectonic division.Majority of structural trend is EW-striking from south to north,whereas in the eastern plateau it strikes NW-SN.There are two gravity anomaly lines near the 85°E and 92°E longitude.It suggests that the deep structure of plateau is divided into three parts from east to west,in contrast to the EW-striking surficial structure.
【Fund】: 中国地质调查局青藏高原基础地质调查成果集成和综合研究项目(基[2006]001-01)资助
【CateGory Index】: P548
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