Mapping Mantle Flows and Slab Anisotropy in the Cascadia Subduction Zone
文献类型：期刊论文
| 作者 | Liang, Xuran1,5; Zhao, Dapeng4; Hua, Yuanyuan1,3,5; Xu, Yi-Gang1,2,3,5 |
| 刊名 | GEOPHYSICAL RESEARCH LETTERS
 |
| 出版日期 | 2023-12-16 |
| 卷号 | 50期号:23页码:12 |
| ISSN号 | 0094-8276 |
| DOI | 10.1029/2023GL105527 |
| 英文摘要 | The Cascadia margin is an unusual subduction zone characterized by the downdip movement of young and thin oceanic plates, where mantle flow and intraslab deformation are still unclear. Here we present new anisotropic tomography of the Cascadia subduction zone, in which the hexagonal symmetry axis of anisotropy is tilting rather than horizontal or vertical as assumed in previous studies of seismic anisotropy. Subduction-induced entrained and toroidal flows under the Cascadia margin are discriminated well by the spatial relationship between tilting-axis anisotropy and slab geometry. The obliquely entrained flow is trapped in a narrow zone (<100 km wide) above and below the subducting slab and reaches similar to 200 km depth, which is surrounded by large-scale sub-horizontal toroidal flow. The intraslab anisotropy is trench-normal above 80 km depth but changes to trench-parallel at 100-400 km depths, which may reflect fossil anisotropy overprinted by deep deformation beneath the arc, or joint effect of serpentinization and hydrous faulting. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001118868800001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/75976]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Liang, Xuran; Zhao, Dapeng |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Peoples R China 2.Univ Chinese Acad Sci, Sch Earth & Planetary Sci, Beijing, Peoples R China 3.Southern Marine Sci & Engn Guangdong Lab Guangzhou, Guangzhou, Peoples R China 4.Tohoku Univ, Grad Sch Sci, Dept Geophys, Sendai, Japan 5.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Ctr Excellence Deep Earth Sci, Guangzhou, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liang, Xuran,Zhao, Dapeng,Hua, Yuanyuan,et al. Mapping Mantle Flows and Slab Anisotropy in the Cascadia Subduction Zone[J]. GEOPHYSICAL RESEARCH LETTERS,2023,50(23):12. |
| APA | Liang, Xuran,Zhao, Dapeng,Hua, Yuanyuan,&Xu, Yi-Gang.(2023).Mapping Mantle Flows and Slab Anisotropy in the Cascadia Subduction Zone.GEOPHYSICAL RESEARCH LETTERS,50(23),12. |
| MLA | Liang, Xuran,et al."Mapping Mantle Flows and Slab Anisotropy in the Cascadia Subduction Zone".GEOPHYSICAL RESEARCH LETTERS 50.23(2023):12. |
入库方式： OAI收割
来源：广州地球化学研究所
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