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| DOI | 10.1093/gji/ggae080 |
| Spatial distribution of mid-lower crustal flow in the SE Tibetan Plateau revealed by P-wave velocity and azimuthal anisotropy beneath the Lijiang-Xiaojinhe fault and its vicinity | |
| 发表日期 | 2024 |
| ISSN | 0956-540X |
| EISSN | 1365-246X |
| 起始页码 | 237 |
| 结束页码 | 2 |
| 卷号 | 237期号:2 |
| 英文摘要 | The Lijiang-Xiaojinhe fault (LXF) and its vicinity are located in the transition zone among the Tibetan Plateau (TP), the South China block and the Indochina block. Researchers believe that this area has acted as a key tectonic zone during the evolution of the TP. Owing to the continuous growth and SE-ward expansion of the TP, the LXF and its vicinity have experienced intense deformation. Although different models, such as the rigid block extrusion and mid-lower crustal flow models, have been proposed to explain this intense deformation, a consensus has not yet been achieved. To better understand the deformation of the LXF and its vicinity, a high-resolution image of the subsurface structure must be constructed. In this study, we construct images of P-wave velocity and azimuthal anisotropy structures by using an eikonal equation-based traveltime tomography method. We collect high-quality seismic data from 276 broad-band seismic stations and manually pick a total of 48 037 first arrivals for the tomography study. Our tomographic results reveal a strong low-velocity body below the LXF and its vicinity. In addition, a strong azimuthal anisotropy structure with an N-S-oriented fast velocity direction is distributed along the low-velocity body. These features indicate the occurrence of mid-lower crustal flow, that penetrates across the LXF and extends to the Dianzhong block (DZB). In addition, we find obvious low-velocity perturbations in the mid-lower crust and uppermost mantle beneath the DZB. The low velocities may be attributed to the upwelling of hot materials from the upper mantle. We consider the limited distribution of mid-lower crustal flow on the margin of the SE TP, and mid-lower crustal flow may not play a significant role in the expansion of the TP. |
| 英文关键词 | Tomography; Body waves; Crustal imaging; Seismic anisotropy |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:001188324500002 |
| 来源期刊 | GEOPHYSICAL JOURNAL INTERNATIONAL
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/304696 |
| 作者单位 | Tsinghua University; Ningxia University |
| 推荐引用方式 GB/T 7714 | . Spatial distribution of mid-lower crustal flow in the SE Tibetan Plateau revealed by P-wave velocity and azimuthal anisotropy beneath the Lijiang-Xiaojinhe fault and its vicinity[J],2024,237(2). |
| APA | (2024).Spatial distribution of mid-lower crustal flow in the SE Tibetan Plateau revealed by P-wave velocity and azimuthal anisotropy beneath the Lijiang-Xiaojinhe fault and its vicinity.GEOPHYSICAL JOURNAL INTERNATIONAL,237(2). |
| MLA | "Spatial distribution of mid-lower crustal flow in the SE Tibetan Plateau revealed by P-wave velocity and azimuthal anisotropy beneath the Lijiang-Xiaojinhe fault and its vicinity".GEOPHYSICAL JOURNAL INTERNATIONAL 237.2(2024). |
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