S wave velocity and Poisson's ratio tomography of the Tibetan Plateau
文献类型：期刊论文
| 作者 | Qu Chen3; Liu XiaoYu4; Yu ChangQing3; Xu Yi1,2; Yang WenCai2 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2020-10-01 |
| 卷号 | 63期号:10页码:3640-3652 |
| ISSN号 | 0001-5733 |
| 关键词 | Tibetan Plateau S wave Poisson's ratio Three-dimensional tomography Volcanic rock belt Crustal detachment Cenozoic rift Eastern structural syntaxis |
| DOI | 10.6038/cjg2020N0236 |
| 英文摘要 | In this study, three-dimensional tomographic studies of crustal seismic wave velocity structure beneath the Tibetan Plateau were carried out using seismic travel time data from China Digital Seismograph Network (CDSN) (2009-2016) seismic stations. The three-dimensional S-wave velocity structure and Poisson's ratio distribution of the Tibetan Plateau with a resolution of 1 degrees X 1 degrees X 20 km were obtained. The results show that the negative anomalous zones of S-wave velocity and high Poisson's ratio zones could be found from the upper crust to the lower crust under the high-potassium and potash volcanic belts of Kekexili and northern Qiangtang. This indicates that during the Tertiary Tibetan Plateau uplift, the East Kunlun Triassic suture zone reruptured due to continental collisions, resulting the upwelling of massive crust-mantle mixed molten material and volcanic eruption. This further reveals that the existence of Cenozoic volcanic belts in the northern Tibetan Plateau is closely related to the formation and uplift of the Tibetan Plateau. The Cenozoic rift zones of the Tibetan Plateau are located at both sides of the S-wave velocity negative anomaly zones in middle-lower crust, the Poisson's ratio below the rift zones in middle-lower crust are less than 0. 22. From the anomalous distribution of S-wave velocity and Poisson's ratio in middle-lower crust under the Cenozoic rift zones of Tibetan Plateau, it could be deduced that the Cenozoic rift of Tibetan Plateau had reached the bottom of the middle crust. This is consistent with the conclusions from the crustal density imaging study of the Tibetan Plateau using gravity inversion. The S-wave velocity and Poisson's ratio of the Tibetan Plateau change sharply with depth from lower crust to crust-mantle boundary, which indicates that large-scale interlayer detachment and horizontal shear occurred in the crust. The Poisson's ratio of the eastern tectonic syntaxis in the Tibetan Plateau is as high as 0. 29-0. 33, and the S-wave velocity perturbation under eastern tectonic syntaxis is negative. This infers that the crust below the eastern tectonic syntaxis is mainly composed of hard serpentinized peridotite. The negative anomalous zones of the S-wave velocity in the middle and lower crust of the Tibetan Plateau is widely expanded, and the bottom of the crust under Tibetan Plateau is almost covered by the negative anomalous zones of the S-wave velocity. Such characteristic of distribution of anomalous of the S-wave velocity may reflect the influence of pipeline flow in the lower crust. |
| WOS关键词 | LITHOSPHERE BENEATH ; AMBIENT NOISE ; CRUSTAL ; EASTERN ; LONGMENSHAN ; DYNAMICS ; SOUTHERN ; CHINA |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | SCIENCE PRESS |
| WOS记录号 | WOS:000575879600005 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/98296]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Yang WenCai |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Zhejiang Univ, Sch Earth Sci, Hangzhou 310027, Peoples R China 3.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 4.China Univ Geosci Beijing, Sch Geophys & Informat Technol, Beijing 100083, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qu Chen,Liu XiaoYu,Yu ChangQing,et al. S wave velocity and Poisson's ratio tomography of the Tibetan Plateau[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2020,63(10):3640-3652. |
| APA | Qu Chen,Liu XiaoYu,Yu ChangQing,Xu Yi,&Yang WenCai.(2020).S wave velocity and Poisson's ratio tomography of the Tibetan Plateau.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,63(10),3640-3652. |
| MLA | Qu Chen,et al."S wave velocity and Poisson's ratio tomography of the Tibetan Plateau".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 63.10(2020):3640-3652. |
入库方式： OAI收割
来源：地质与地球物理研究所
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