| 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 |
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| 关键词:northeastern Tibetan Plateau deep seismic reflection profile lithospheric deformation shortening |
| 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) |
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| Lithospheric Deformation Shortening of the Northeastern Tibetan Plateau: Evidence from Reprocessing of Deep Seismic Reflection Data |
| 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. |
| GAO Rui,WANG Hai-yan,WANG Cheng-shan,YIN An,ZHANG Yu-xiu,LI Qiu-sheng,GUO Tong-lou,LI Wen-hui.2011.Lithospheric Deformation Shortening of the Northeastern Tibetan Plateau: Evidence from Reprocessing of Deep Seismic Reflection Data[J].Acta Geoscientica Sinica,32(5):513-520. |
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