Crustal structure beneath the Longmenshan area in eastern Tibet: new constrains from reprocessing wide-angle seismic data of the Aba-Longmenshan-Suining profile
文献类型：期刊论文
| 作者 | Zhang Xin-Yan1; Gao Rui1,2; Bai Zhi-Ming2,3; Xu Tao3,4; Li Qiu-Sheng1 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2017-06-01 |
| 卷号 | 60期号:6页码:2200-2212 |
| 关键词 | Tibetan Plateau Longmenshan fault zone Deep seismic sounding Crustal velocity structure |
| ISSN号 | 0001-5733 |
| DOI | 10.6038/cjg20170614 |
| 文献子类 | Article |
| 英文摘要 | The Longmenshan area in the eastern Tibetan Plateau experienced strong crustal deformation and faulting during Mesozoic and late Cenozoic epochs resulting in significant uplift of the Longmenshan Mountains, which serves as an important window to see the uplift and lateral expansion of the Tibetan Plateau. In this paper, the deep seismic sounding profile named the Aba-Longmenshan-Suning profile is reprocessed using a high-precision traveltime tomography for velocity structure with an irregular surface to reconstruct the crustal structure beneath this area. The obtained velocity structure along the profile could be divided into three major sections: the Songpan-Garze block, Longmenshan fault zone and Sichuan basin. The sedimentary cover of the Songpan-Garze block is about 10 km thick, with high-velocity bodies in 5-10 km depths, which correspond to the faults and likely the intrusion of Mesozoic granites. The undulating interface of the sediment may indicate the thrust-nappe tectonics. Velocity structures of the middle and lower crust change continuously with lower average velocity (about 6. 26 km . s(-1)). In the Sichuan basin, the sediment in the west is thicker than that in the west. The sediment in the west even exhibits compression and torsion forms, which may be caused by compression and erosion. The middle and lower crust in the west is thinner than that in the east with higher average velocity (about 6. 29 km . s(-1)). The Longmenshan fault zone is a transition zone of the crustal velocity and thickness, with the Moho uplifting about 13 km from the west to the east. Along the whole profile the Moho shows toughness winding, while the velocity of the middle and lower crust changes continuously in the lateral direction, which may indicate that the ancient Yangtze block has reached beneath the Songpan-Garze block. In the Songpan-Garze block, which is considered to be a passive margin, the middle and lower crust experienced ductile deformation under strong compression. The brittle upper crust with thrust-nappe belts is dragged by the middle and lower crust, while stress is accumulated and released on the faults, which may induce a large number of earthquakes. |
| WOS关键词 | TRAVEL-TIME TOMOGRAPHY ; WENCHUAN EARTHQUAKE ; CONTINENTAL COLLISION ; VELOCITY STRUCTURE ; SHAN RANGE ; COMPLEX 2D ; PLATEAU ; DEFORMATION ; UPLIFT ; BELT |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000403744600014 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/51783]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Gao Rui |
| 作者单位 | 1.Chinese Acad Geol Sci, Inst Geol, MLR, Key Lab Earthprobe & Geodynam, Beijing 100037, Peoples R China 2.Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangzhou 510275, Guangdong, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 4.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang Xin-Yan,Gao Rui,Bai Zhi-Ming,et al. Crustal structure beneath the Longmenshan area in eastern Tibet: new constrains from reprocessing wide-angle seismic data of the Aba-Longmenshan-Suining profile[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2017,60(6):2200-2212. |
| APA | Zhang Xin-Yan,Gao Rui,Bai Zhi-Ming,Xu Tao,&Li Qiu-Sheng.(2017).Crustal structure beneath the Longmenshan area in eastern Tibet: new constrains from reprocessing wide-angle seismic data of the Aba-Longmenshan-Suining profile.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,60(6),2200-2212. |
| MLA | Zhang Xin-Yan,et al."Crustal structure beneath the Longmenshan area in eastern Tibet: new constrains from reprocessing wide-angle seismic data of the Aba-Longmenshan-Suining profile".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 60.6(2017):2200-2212. |
入库方式： OAI收割
来源：地质与地球物理研究所
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