| 青藏高原西部班公-怒江缝合带下方地壳结构与地块拼合模式 |
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| 引用本文： | 李海鸥,徐锡伟,姜枚,马文涛.青藏高原西部班公-怒江缝合带下方地壳结构与地块拼合模式[J].地震地质,2010,32(2):213. |
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| 作者姓名： | 李海鸥 徐锡伟 姜枚 马文涛 |
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| 作者单位： | 1. 中国地震局地质研究所,北京,100029
2. 中国地质科学院地质研究所,北京,100037 |
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| 基金项目： | 国家科技支撑计划项目，中国地震局地质研究所基本科研业务专项 |
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| 摘 要： | 利用远震接收函数偏移成像方法获得青藏高原西部Hi-Climb项目剖面北段地壳结构转换波成像。结果显示班公-怒江缝合带下方拉萨地体上地壳向N仰冲,下地壳向N俯冲,而羌塘地块上地壳向S仰冲,下地壳向S俯冲,可能意味着青藏高原西部拉萨地块和羌塘地块具有复杂的拼合过程。结合前人的岩石学研究成果,建立了新特提斯北洋盆洋壳S向俯冲、距今60～50Ma印度板块与欧亚板块碰撞后,拉萨地块的下地壳向羌塘地块下俯冲,而后印度板块俯冲到羌塘地块下方的地块拼合模式
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| 关 键 词： | 地壳结构 接收函数 班公-怒江缝合带 拉萨地块 羌塘地块 |
CRUSTAL STRUCTURE UNDER BANGONG-NUJIANG SUTURE AND TERRAIN ASSEMBLY MODEL OF LHASA AND QIANGTANG BLOCKS IN THE WESTERN QINGHAI-TIBET PLATEAU |
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| LI Hai-ou,XU Xi-wei,JIANG Mei,MA Wen-tao.CRUSTAL STRUCTURE UNDER BANGONG-NUJIANG SUTURE AND TERRAIN ASSEMBLY MODEL OF LHASA AND QIANGTANG BLOCKS IN THE WESTERN QINGHAI-TIBET PLATEAU[J].Seismology and Geology,2010,32(2):213. |
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| Authors: | LI Hai-ou XU Xi-wei JIANG Mei MA Wen-tao |
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| Affiliation: | 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 |
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| Abstract: | 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 basi |
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| Keywords: | crustal structure receiver function Bangong-Nujiang Suture(BNS) Lhasa block Qiangtang block |
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