Segmented Up-Bending of the Arabian Continental Plate Revealed by Pn Attenuation Tomography
文献类型：期刊论文
| 作者 | Yang, Geng1,5; Chen, Ling1,4; Zhao, Lian-Feng3,5; Xie, Xiao-Bi2; Yao, Zhen-Xing5 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
 |
| 出版日期 | 2023-12-01 |
| 卷号 | 128期号:12页码:19 |
| ISSN号 | 2169-9313 |
| 关键词 | Pn-wave attenuation Iranian Plateau slab detachment plate up-bending post-collision magmatism mantle upwelling |
| DOI | 10.1029/2023JB028062 |
| 英文摘要 | The Zagros orogen in the Iranian Plateau serves as a natural laboratory for studying the tectonic evolution of the transition from oceanic subduction to continental collision. Various observations from both geology and geophysics show that deep oceanic slabs may have detached one after another from the Arabian continental margin, forming a complex plate front beneath the Zagros orogen. However, where slab detachment occurred and how slab detachment affects shallower continental underthrusting remain poorly understood. The mechanism behind the complex post-collision magmatism remains elusive. While the uppermost mantle is often considered the heart of the mantle lid, its rheological variations can provide insights into the underlying thermal structure. Here, we construct a high-resolution Pn-wave attenuation model for the uppermost mantle beneath the Iranian Plateau and surrounding areas using a newly compiled data set and constrain the lithospheric structure by combining the Lg-wave attenuation within the crust. Weak Pn-wave attenuation outlines the boundary of the Arabian Plate near the Moho discontinuity, extending further in the direction of underthrusting in the northwestern and southeastern regions. This is likely due to the up-bending and underplating of the Arabian lithosphere following the cessation of slab pull. The overlying crusts in northwestern and southeastern Zagros thickened under the compressive force from plate underplating. The correlations among the surface Miocene-Quaternary volcanism, strong Lg attenuation in the crust and strong Pn attenuation in the uppermost mantle suggest that asthenospheric materials escaped from slab windows and further intruded into the upper mantle and crust to feed the post-collision volcanoes. Various geological and geophysical observations show that deep oceanic slabs may have detached one after another from the Arabian continental margin, forming a complex plate front beneath the Iranian Plateau. However, the processes of continental underthrusting and collision remain poorly understood. The formation mechanism of the complex magmatism in the Iranian Plateau is also unclear. The uppermost mantle, often considered the core of the mantle lid, exhibits rheological variations that can provide insights into the underlying thermal structure. In this study, we conducted high-resolution Pn-wave attenuation tomography for the uppermost mantle beneath the Iranian Plateau, using 23,251 vertical-component waveforms recorded at 291 previous stations and 197 new temporary stations. The resulting images show that the cold Arabian plate is characterized by weak Pn attenuation beneath the Zagros orogen and the strong attenuation anomalies are related to younger magmatism. Combined with previous geological and geochemical observations, our results suggest a successive evolution process under the Iranian Plateau. The ancient Neotethys oceanic plate partially detached from the Arabian continental margin. After the slab break-off at depth, the Arabian continental plate rose back and flattened below the overriding plate. Meanwhile, the detachment-related asthenosphere upwelling fed the younger volcanism at the surface. A high-resolution broadband Pn attenuation model is obtained beneath the Iranian PlateauWeak Pn attenuation delineates the underthrusting front of the Arabian Plate and reveals the segmented plate up-bendingPost-collision magmatism is likely related to the detachment-related mantle upwelling characterized by strong Pn attenuation |
| WOS关键词 | VELOCITY STRUCTURE BENEATH ; ZAGROS COLLISION ZONE ; SHEAR-WAVE VELOCITY ; MANTLE LID VELOCITY ; CRUSTAL THICKNESS ; SLAB DETACHMENT ; SEISMIC MOMENT ; IRAN ; SUBDUCTION ; CONSTRAINTS |
| 资助项目 | National Natural Science Foundation of China ; Institute of Geophysics and Geology of the Chinese Academy of Sciences (IGGCAS) ; Geological Survey of Iran (GSI) ; [91855207] ; [41630210] ; [U2139206] ; [41974054] ; [41974061] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | AMER GEOPHYSICAL UNION |
| WOS记录号 | WOS:001130075500001 |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute of Geophysics and Geology of the Chinese Academy of Sciences (IGGCAS) ; Institute of Geophysics and Geology of the Chinese Academy of Sciences (IGGCAS) ; Institute of Geophysics and Geology of the Chinese Academy of Sciences (IGGCAS) ; Institute of Geophysics and Geology of the Chinese Academy of Sciences (IGGCAS) ; Geological Survey of Iran (GSI) ; Geological Survey of Iran (GSI) ; Geological Survey of Iran (GSI) ; Geological Survey of Iran (GSI) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute of Geophysics and Geology of the Chinese Academy of Sciences (IGGCAS) ; Institute of Geophysics and Geology of the Chinese Academy of Sciences (IGGCAS) ; Institute of Geophysics and Geology of the Chinese Academy of Sciences (IGGCAS) ; Institute of Geophysics and Geology of the Chinese Academy of Sciences (IGGCAS) ; Geological Survey of Iran (GSI) ; Geological Survey of Iran (GSI) ; Geological Survey of Iran (GSI) ; Geological Survey of Iran (GSI) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute of Geophysics and Geology of the Chinese Academy of Sciences (IGGCAS) ; Institute of Geophysics and Geology of the Chinese Academy of Sciences (IGGCAS) ; Institute of Geophysics and Geology of the Chinese Academy of Sciences (IGGCAS) ; Institute of Geophysics and Geology of the Chinese Academy of Sciences (IGGCAS) ; Geological Survey of Iran (GSI) ; Geological Survey of Iran (GSI) ; Geological Survey of Iran (GSI) ; Geological Survey of Iran (GSI) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute of Geophysics and Geology of the Chinese Academy of Sciences (IGGCAS) ; Institute of Geophysics and Geology of the Chinese Academy of Sciences (IGGCAS) ; Institute of Geophysics and Geology of the Chinese Academy of Sciences (IGGCAS) ; Institute of Geophysics and Geology of the Chinese Academy of Sciences (IGGCAS) ; Geological Survey of Iran (GSI) ; Geological Survey of Iran (GSI) ; Geological Survey of Iran (GSI) ; Geological Survey of Iran (GSI) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/111696]  |
| 专题 | 地质与地球物理研究所_中国科学院地球与行星物理重点实验室 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 | Zhao, Lian-Feng |
| 作者单位 | 1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China 2.Univ Calif Santa Cruz, Inst Geophys & Planetary Phys, Santa Cruz, CA USA 3.Chinese Acad Sci, Inst Geol & Geophys, Heilongjiang Mohe Observ Geophys, Beijing, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithosphere Evolut, Beijing, Peoples R China 5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Geng,Chen, Ling,Zhao, Lian-Feng,et al. Segmented Up-Bending of the Arabian Continental Plate Revealed by Pn Attenuation Tomography[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2023,128(12):19. |
| APA | Yang, Geng,Chen, Ling,Zhao, Lian-Feng,Xie, Xiao-Bi,&Yao, Zhen-Xing.(2023).Segmented Up-Bending of the Arabian Continental Plate Revealed by Pn Attenuation Tomography.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,128(12),19. |
| MLA | Yang, Geng,et al."Segmented Up-Bending of the Arabian Continental Plate Revealed by Pn Attenuation Tomography".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 128.12(2023):19. |
入库方式： OAI收割
来源：地质与地球物理研究所
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