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DOI | 10.1038/s41467-020-15492-6 |
Seismic evidence for subduction-induced mantle flows underneath Middle America | |
Zhu, Hejun; Stern, Robert J.; Yang, Jidong | |
2020-04-29 | |
发表期刊 | NATURE COMMUNICATIONS |
ISSN | 2041-1723 |
出版年 | 2020 |
卷号 | 11期号:1 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Laboratory experiments and geodynamic simulations demonstrate that poloidal- and toroidal-mode mantle flows develop around subduction zones. Here, we use a new 3-D azimuthal anisotropy model constructed by full waveform inversion, to infer deep subduction-induced mantle flows underneath Middle America. At depths shallower than 150 km, poloidal-mode flow is perpendicular to the trajectory of the Middle American Trench. From 300 to 450 km depth, return flows surround the edges of the Rivera and Atlantic slabs, while escape flows are inferred through slab windows beneath Panama and central Mexico. Furthermore, at 700 km depth, the study region is dominated by the Farallon anomaly, with fast axes perpendicular to its strike, suggesting the development of lattice-preferred orientations by substantial stress. These observations provide depth-dependent seismic anisotropy for future mantle flow simulations, and call for further investigations about the deformation mechanisms and elasticity of minerals in the transition zone and uppermost lower mantle. The motions of subducted slabs are expected to drive mantle flow around slab edges, however, evidence of deep mantle flow has so far remained elusive. Here, the authors present a Full Waveform Inversion 3-D anisotropy model which allows them to infer deep subduction-induced mantle flows underneath the Mid-Americas and the Caribbean. |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000531855500005 |
WOS关键词 | FINITE-FREQUENCY SENSITIVITY ; WAVE-FORM INVERSION ; LATTICE PREFERRED ORIENTATION ; AZIMUTHAL ANISOTROPY ; CRUSTAL CORRECTIONS ; ADJOINT TOMOGRAPHY ; SPECTRAL-ELEMENT ; PARALLEL FLOW ; PLATE ; DEFORMATION |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/249496 |
专题 | 资源环境科学 |
作者单位 | Univ Texas Dallas, Dept Geosci, Dallas, TX 75241 USA |
推荐引用方式 GB/T 7714 | Zhu, Hejun,Stern, Robert J.,Yang, Jidong. Seismic evidence for subduction-induced mantle flows underneath Middle America[J]. NATURE COMMUNICATIONS,2020,11(1). |
APA | Zhu, Hejun,Stern, Robert J.,&Yang, Jidong.(2020).Seismic evidence for subduction-induced mantle flows underneath Middle America.NATURE COMMUNICATIONS,11(1). |
MLA | Zhu, Hejun,et al."Seismic evidence for subduction-induced mantle flows underneath Middle America".NATURE COMMUNICATIONS 11.1(2020). |
条目包含的文件 | 条目无相关文件。 |
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