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《Seismology and Geology》 2010-02
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CRUSTAL STRUCTURE UNDER BANGONG-NUJIANG SUTURE AND TERRAIN ASSEMBLY MODEL OF LHASA AND QIANGTANG BLOCKS IN THE WESTERN QINGHAI-TIBET PLATEAU

LI Hai-ou1)XU Xi-wei1)JIANG Mei2)MA Wen-tao1)1)Institute of Geology,China Earthquake Administration,Beijing 100029,China2)Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China  
Teleseismic receiver functions(RFs)migration method has been used to image the spatial variation of the converters in the crust and upper mantle along the north Hi-Climb broadband seismic array in the western Qinghai-Tibet Plateau.Results of RFs migration image show the crustal structure under Bangong-Nujiang Suture(BNS)takes on opposite underthrust form,i.e.,the Lhasa block exhibits northward overthrust and underthrust of upper crust and lower crust,respectively,the Qiangtang block southward overthrust and underthrust of upper crust and lower crust,respectively.The above underthrust form means Lasha and Qiangtang blocks may have complex assembly process.Combined with petrology achievements from previous researchers,terrain assembly model has been constructed based on the opposite underthrust form under BNS.Terrain assembly model illustrates that oceanized crust of the New-Tethys north ocean basin has been subducted southward beneath the Lasha block since the closure of the ocean basin and the continental collision of Lhasa and Qiangtang blocks.Since the continental collision of the Indian and Eurasian Plates at 60~50Ma ago,the lower crust of Lasha block however has been subducted northward and may have made the southward subduction plate delaminated,and then Indian Plate subducted beneath the Qiangtang block.
【Fund】: 国家科技支撑计划项目(2008BAC38B0401);; 中国地震局地质研究所基本科研业务专项(DFIGCEA060828)共同资助
【CateGory Index】: P315.2
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