| Detached Pacific Slab Beneath the Philippine Sea Plate and Its Geodynamical Implications | |
Fan, Jianke1; Zhao, Dapeng2; Li, Cuilin1; Dong, Dongdong1
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| 2023-10-01 | |
| 发表期刊 | GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
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| 卷号 | 24期号:10页码:17 |
| 通讯作者 | Fan, Jianke(fanjianke@qdio.ac.cn) ; Dong, Dongdong(dongdongdong@qdio.ac.cn) |
| 摘要 | Formation and evolution of the Philippine Sea Plate (PSP) are still highly debated, mainly because the PSP has been surrounded by subduction zones since its inception. Therefore, it is vital to determine a new tomographic model with higher resolution to precisely portray the subducted slabs beneath and around the PSP, in particular, the subducted Pacific slab that has played an essential role in the PSP formation and evolution. In this study, an updated tomographic model is obtained by inverting a large number of P-wave arrival times of local and regional earthquakes in and around the PSP. Our tomography reveals a detached piece of the Pacific slab in the mantle transition zone beneath the middle PSP, which may be mainly related to the PSP clockwise rotation and transform or strike-slip faults in this region. The detached Pacific slab may promote the formation and evolution of the Shikoku and Parece-Vela basins and the Mariana Trough by inducing hot mantle upwelling. Our tomography also reveals isolated high-velocity anomalies beneath the southernmost PSP, which may reflect remnants of the subducted slab at the beginning of the PSP formation. A high-velocity gap appears beneath the southern PSP, which may reflect the influence of a mantle plume. The Philippine Sea Plate (PSP) is located in the northwest Pacific region and mainly comprises oceanic basins, including the West Philippine Basin, the Shikoku and Parece-Vela basins, and the Mariana Trough. The PSP is surrounded by many subduction zones, so there are considerable controversies on the PSP formation and evolution. It is vital to reveal the subducted slabs beneath and around the PSP to provide better constraints on the PSP evolution. In this study, we determine a new tomographic model that clearly discloses morphologies of the subducted Pacific Plate beneath the PSP. In particular, a detached piece of the Pacific Plate is revealed in the mantle transition zone (at 410-660 km depths) beneath the middle PSP, which may have promoted the formation and evolution of the Shikoku and Parece-Vela basins and the Mariana Trough by inducing hot mantle upwelling. An isolated high-velocity anomaly is detected beneath the southernmost PSP, which may be remnants of the subducted slab when the PSP formed. An updated tomographic model of the crust and mantle beneath the Philippine Sea Plate is obtainedA detached piece of the Pacific slab in the mantle transition zone beneath the middle Philippine Sea Plate is revealedThe detached Pacific slab may have played an important role in the Philippine Sea Plate evolution |
| DOI | 10.1029/2023GC010883 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | We would like to thank Drs. Quanshu Yan, Yuanyuan Hua, Jie Liao, Lipeng Zhang, and Pengyuan Guo for their constructive suggestions and comments. We are grateful to the International Seismological Center for providing the P-wave arrival times used in this s[XDB42000000] ; Strategic Priority Research Program of the Chinese Academy of Sciences[41976052] ; Strategic Priority Research Program of the Chinese Academy of Sciences[41976051] ; Strategic Priority Research Program of the Chinese Academy of Sciences[41876043] ; National Natural Science Foundation of China[19H01996] ; Japan Society for the Promotion of Science |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:001073288600001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| WOS关键词 | UPPER-MANTLE BENEATH ; P-WAVE TOMOGRAPHY ; SEISMIC STRUCTURE ; WESTERN PACIFIC ; TECTONIC EVOLUTION ; SUBDUCTING SLABS ; TRANSITION ZONE ; EXOTIC ORIGIN ; TRAVEL-TIMES ; ASIA |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/181729 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Fan, Jianke; Dong, Dongdong |
| 作者单位 | 1.Chinese Acad Sci, Ctr Ocean Mega Sci, Inst Oceanol, CAS Key Lab Marine Geol & Environm, Qingdao, Peoples R China 2.Tohoku Univ, Grad Sch Sci, Dept Geophys, Sendai, Japan |
| 第一作者单位 | 中国科学院海洋研究所 |
| 通讯作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Fan, Jianke,Zhao, Dapeng,Li, Cuilin,et al. Detached Pacific Slab Beneath the Philippine Sea Plate and Its Geodynamical Implications[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2023,24(10):17. |
| APA | Fan, Jianke,Zhao, Dapeng,Li, Cuilin,&Dong, Dongdong.(2023).Detached Pacific Slab Beneath the Philippine Sea Plate and Its Geodynamical Implications.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,24(10),17. |
| MLA | Fan, Jianke,et al."Detached Pacific Slab Beneath the Philippine Sea Plate and Its Geodynamical Implications".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 24.10(2023):17. |
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| Detached Pacific Sla（15587KB） | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | 浏览 | |
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