Seismic Evidence of Basin Development in NE Tibetan Plateau in Response to Deep Crustal Dynamics From Joint Inversion of Rayleigh Wave Ellipticity and Phase Velocity
文献类型：期刊论文
| 作者 | Ren, Pengfei1; Guo, Zhen1; Liu, Yiduo2; Luo, Bin1; Wu, Xiaoyang3 |
| 刊名 | GEOPHYSICAL RESEARCH LETTERS
 |
| 出版日期 | 2024-09-28 |
| 卷号 | 51期号:18页码:12 |
| 关键词 | NE Tibet Rayleigh wave H/Z ratio 3-D Vs model high-resolution basin evolution crustal deformation |
| ISSN号 | 0094-8276 |
| DOI | 10.1029/2024GL108589 |
| 通讯作者 | Guo, Zhen(guoz3@sustech.edu.cn) |
| 英文摘要 | The NE Tibet experienced complex and distinct basin developments and uplifts in different areas. However, the reasons for such distinct surface deformation and their relationship to deep crustal geodynamic processes are not well understood. Here, we obtain a crust model of NE Tibet by jointly inverting Rayleigh wave ellipticity and phase velocity. Our results reveal that deep crustal strength contrasts across NE Tibet play an important role in controlling basin development. Extrusion of the significantly weak Qilian crust is obstructed by rigid Alxa block, resulting in deep foreland basin with dramatic topographic step. In contrast, the relatively weak crust of Longzhong absorbs outward extrusion of NE Tibet within a wide transition zone, leading to small intermontane basins. Furthermore, the systematic thinning of basins from north to south around the western Ordos Block demonstrates the tectonic transformation from extension to compression due to expansion of NE Tibet since the late Miocene. In this study, we obtain a high-resolution model of NE Tibet by jointly inverting Rayleigh wave phase velocity and ellipticity (the radial-to-vertical amplitude ratio), which provides complementary constraints to the shallow structure. Our results show a clear correlation between velocity variations in the deep crust and basin structures at the surface. We infer that the extrusion of mechanically weak mid-to-lower crust of Qilian is obstructed by the strong Alxa block, leading to the steep topography and deep foreland Hexi Basin. To the east, in contrast, the outward extrusion of Songpan-Ganzi is absorbed in a wide range by the relatively weak Longzhong region, developing gently sloping topography and small intermontane basins. Furthermore, the significant structural differences of rift basins from north to south around the western Ordos likely result from tectonic regime transformation induced by the continuous expansion of NE Tibet since the late Miocene. Our results improve the understanding of how deep crustal geodynamic processes influence surface uplift and basin developments in the expanding NE Tibet. A high-resolution 3-D crustal model of NE Tibet is obtained by joint inversion of Rayleigh wave ellipticity and phase dispersion We infer that deep crust extrusion and strength differences across plateau boundaries control distinct surface deformation in NE Tibet The systematic thinning of basins in west Ordos indicates tectonic regime transformation due to expansion of Tibet since Miocene |
| WOS关键词 | CENOZOIC TECTONIC EVOLUTION ; SENSITIVITY KERNELS ; DEFORMATION ; GROWTH ; FAULT ; BENEATH ; DENSITY ; MOUNTAINS ; VOLCANISM ; MARGIN |
| 资助项目 | National Natural Science Foundation of China[42122027] ; Data Management Centre of the China National Seismic Network at the Institute of Geophysics, China Earthquake Administration - National Natural Science Foundation of China[KCXFZ20201221173608023] ; Shenzhen Sustainable Development Science and Technology Project ; Center for Computational Science and Engineering at Southern University of Science and Technology |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001316690400001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/198948]  |
| 专题 | 海洋研究所_海洋地质与环境重点实验室 |
| 通讯作者 | Guo, Zhen |
| 作者单位 | 1.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen, Peoples R China 2.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Surface Proc, Chengdu, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ren, Pengfei,Guo, Zhen,Liu, Yiduo,et al. Seismic Evidence of Basin Development in NE Tibetan Plateau in Response to Deep Crustal Dynamics From Joint Inversion of Rayleigh Wave Ellipticity and Phase Velocity[J]. GEOPHYSICAL RESEARCH LETTERS,2024,51(18):12. |
| APA | Ren, Pengfei,Guo, Zhen,Liu, Yiduo,Luo, Bin,&Wu, Xiaoyang.(2024).Seismic Evidence of Basin Development in NE Tibetan Plateau in Response to Deep Crustal Dynamics From Joint Inversion of Rayleigh Wave Ellipticity and Phase Velocity.GEOPHYSICAL RESEARCH LETTERS,51(18),12. |
| MLA | Ren, Pengfei,et al."Seismic Evidence of Basin Development in NE Tibetan Plateau in Response to Deep Crustal Dynamics From Joint Inversion of Rayleigh Wave Ellipticity and Phase Velocity".GEOPHYSICAL RESEARCH LETTERS 51.18(2024):12. |
入库方式： OAI收割
来源：海洋研究所
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