DOI: 10.1016/j.epsl.2018.08.015
Scopus记录号: 2-s2.0-85051775546
论文题名: Western U.S. seismic anisotropy revealing complex mantle dynamics
作者: Zhou Q. ; Hu J. ; Liu L. ; Chaparro T. ; Stegman D.R. ; Faccenda M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 500 起始页码: 156
结束页码: 167
语种: 英语
英文关键词: complex mantle dynamics
; Farallon slab
; hot mantle intrusion
; Juan de Fuca subduction
; lithosphere thickness variation
; western U.S. seismic anisotropy
Scopus关键词: Deformation
; Geodynamics
; Seismology
; Structural geology
; Farallon slab
; hot mantle intrusion
; Juan de Fuca subduction
; Mantle dynamics
; Seismic anisotropy
; Thickness variation
; Anisotropy
; continental interior
; deformation
; igneous intrusion
; intraplate process
; mantle structure
; oceanic lithosphere
; seismic anisotropy
; slab
; Idaho
; Oregon
; Pacific Northwest
; Pacific Ocean
; Snake River Plain
; United States
; Wyoming
; Yellowstone Caldera
英文摘要: The origin of the complex pattern of SKS splitting over the western United States (U.S.) remains a long-lasting debate, where a model that simultaneously matches the various SKS features is still lacking. Here we present a series of quantitative geodynamic models with data assimilation that systematically evaluate the influence of different lithospheric and mantle structures on mantle flow and seismic anisotropy. These tests reveal a configuration of mantle deformation more complex than ever envisioned before. In particular, we find that both lithospheric thickness variations and toroidal flows around the Juan de Fuca slab modulate flow locally, but their co-existence enhances large-scale mantle deformation below the western U.S. The ancient Farallon slab below the east coast pulls the western U.S. upper mantle eastward, spanning the regionally extensive circular pattern of SKS splitting. The prominent E–W oriented anisotropy pattern within the Pacific Northwest reflects the existence of sustaining eastward intrusion of the hot Pacific oceanic mantle to beneath the continental interior, from within slab tears below Oregon to under the Snake River Plain and the Yellowstone caldera. This work provides an independent support to the formation of intra-plate volcanism due to intruding shallow hot mantle instead of a rising mantle plume. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109685
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Geology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States; IGPP, Scripps Institution of Oceanography, UC San Diego, La Jolla, CA 92093, United States; Dipartimento di Geoscienze, Università di Padova, Padova, 35131, Italy
Recommended Citation:
Zhou Q.,Hu J.,Liu L.,et al. Western U.S. seismic anisotropy revealing complex mantle dynamics[J]. Earth and Planetary Science Letters,2018-01-01,500