DOI: 10.1002/2014GL060914
论文题名: Deflection of mantle flow beneath subducting slabs and the origin of subslab anisotropy
作者: Paczkowski K. ; Thissen C.J. ; Long M.D. ; Montési L.G.J.
刊名: Geophysical Research Letters
ISSN: 0094-9732
EISSN: 1944-9463
出版年: 2014
卷: 41, 期: 19 起始页码: 6734
结束页码: 6742
语种: 英语
英文关键词: LPO
; mantle dynamics
; seismic anisotropy
; shear wave splitting
; slab
; subduction zone
Scopus关键词: Anisotropy
; Shear waves
; Tectonics
; LPO
; Mantle dynamics
; Seismic anisotropy
; Shear wave splitting
; Slab
; Subduction zones
; Shear flow
; anisotropy
; deflection
; mantle
; orientation
; S-wave
; slab
; subduction zone
; two-dimensional flow
英文摘要: Global compilations of subslab shear wave splitting parameters show a mix of trench-parallel and trench-perpendicular fast directions that often directly contradict predictions from two-dimensional models of slab-entrained flow. Here we show that subslab anisotropy is consistent with three-dimensional geodynamic models that feature the interaction between subducting slabs and regional mantle flow. Each model represents a specific region for which high-quality source-side shear wave splitting data are available. We compare the distribution of finite strain in the models with shear wave splitting observations, showing that both trench-parallel and trench-perpendicular fast directions can be explained by deflection of regional mantle flow around or beneath subducted slabs. Subslab maximum elongation directions calculated from our models depend on a combination of geometry factors (such as slab dip angle and maximum depth), mechanical parameters (such as decoupling between the slab and the subjacent mantle), and the orientation and magnitude of the regional mantle flow. Key Points Regionally specific models of flow beneath subducting slabs are presentedSubslab dynamics controlled by deflection of mantle flow in vicinity of slabPredicted finite strain directions generally agree with anisotropy observations ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911392888&doi=10.1002%2f2014GL060914&partnerID=40&md5=da39e399d0f21ded5c1f87405e400396
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6996
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geology, University of Maryland, College Park, MD, United States
Recommended Citation:
Paczkowski K.,Thissen C.J.,Long M.D.,et al. Deflection of mantle flow beneath subducting slabs and the origin of subslab anisotropy[J]. Geophysical Research Letters,2014-01-01,41(19).