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青藏高原东北缘岩石圈缩短变形——深地震反射剖面再处理提供的证据
引用本文:高锐,王海燕,王成善,尹安,张玉修,李秋生,郭彤楼,李文辉.青藏高原东北缘岩石圈缩短变形——深地震反射剖面再处理提供的证据[J].地球学报,2011,32(5):513-520.
作者姓名:高锐  王海燕  王成善  尹安  张玉修  李秋生  郭彤楼  李文辉
作者单位:中国地质科学院地质研究所岩石圈中心;中国地质科学院深部探测与地球动力学重点开放实验室;中国地质科学院地质研究所岩石圈中心;中国地质科学院深部探测与地球动力学重点开放实验室;中国地质大学(北京)地质过程与矿产资源国家重点实验室;加州大学洛杉矶分校;中国地质大学(北京)地质过程与矿产资源国家重点实验室;中国地质科学院地质研究所岩石圈中心;中国地质科学院深部探测与地球动力学重点开放实验室;中国石化南方勘探分公司;中国地质科学院地质研究所岩石圈中心;中国地质科学院深部探测与地球动力学重点开放实验室
基金项目:国家自然科学基金项目(编号: 40830316); 国际科技合作项目(编号: 2006DFA21340); 国家地质调查项目(编号: 1212010711813); 国家专项项目“深部探测技术与实验研究”(编号: SinoProbe-02)
摘    要:青藏高原是由印度板块和亚洲板块于50~60 Ma碰撞而形成的全球最高最大的高原,已成为多数国内外学者的共识.然而,关于它的岩石圈变形机制却是长期争论的问题.深地震反射剖面是精细揭示岩石圈结构、分辨变形样式的有效技术.重新处理的松潘地块一西秦岭造山带深地震反射剖面揭示出岩石圈变形的细节,以地壳上部的双重逆冲构造、地壳中部...

关 键 词:青藏高原东北缘  深地震反射剖面  岩石圈缩短变形

Lithospheric Deformation Shortening of the Northeastern Tibetan Plateau: Evidence from Reprocessing of Deep Seismic Reflection Data
GAO Rui,WANG Hai-yan,WANG Cheng-shan,YIN An,ZHANG Yu-xiu,LI Qiu-sheng,GUO Tong-lou and LI Wen-hui.Lithospheric Deformation Shortening of the Northeastern Tibetan Plateau: Evidence from Reprocessing of Deep Seismic Reflection Data[J].Acta Geoscientia Sinica,2011,32(5):513-520.
Authors:GAO Rui  WANG Hai-yan  WANG Cheng-shan  YIN An  ZHANG Yu-xiu  LI Qiu-sheng  GUO Tong-lou and LI Wen-hui
Affiliation:Lithosphere Research Center, Institute of Geology, Chinese Academy of Geological sciences; Key Laboratory of Earthprobe and Geodynamics, Chinese Academy of Geological Sciences;Lithosphere Research Center, Institute of Geology, Chinese Academy of Geological sciences; Key Laboratory of Earthprobe and Geodynamics, Chinese Academy of Geological Sciences;National Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences;Department of Earth and Space and Institute of Geophysics and Planetary Physics, University of California,;National Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences;Lithosphere Research Center, Institute of Geology, Chinese Academy of Geological sciences; Key Laboratory of Earthprobe and Geodynamics, Chinese Academy of Geological Sciences;Southern China Exploration Division, Sinopec Company;Lithosphere Research Center, Institute of Geology, Chinese Academy of Geological sciences; Key Laboratory of Earthprobe and Geodynamics, Chinese Academy of Geological Sciences
Abstract:Although most researchers both in China and abroad have agreed that the Tibetan plateau is the largest highland induced by the India-Asia collision over the past 60~50 Ma, its formation mechanism has long been a problem of controversy. Deep seismic reflection profiling is an effective technique for revealing the fine structure of the lithosphere and detecting the deformation style of the crust. The reprocessing of the deep seismic reflection profile across Songpan block-West Qinling orogenic belt has revealed the details of lithosphere deformation. The superimposition of the thrust duplex structure in the upper crust and a sub-horizontal detachment in the middle crust and the vertical stacking of Moho at the bottom of the crust show that the lithospheric shortening deformation on the northeastern margin of the Tibetan Plateau was the main formation mechanism. The Kunlun fault 1000 km in length, one of the largest continental-scale strike-slip faults in Tibet, terminates at a sub-horizontal decollement with the depth of 35 km in the lowermost crust of Tibet. The study establishing the vertical structure of the lithosphere shows tectonic relationship between the western Qinling orogenic belt and the Zoige basin on the lithosphere scale.
Keywords:northeastern Tibetan Plateau  deep seismic reflection profile  lithospheric deformation shortening
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