globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116642
论文题名:
Pervasive low-velocity layer atop the 410-km discontinuity beneath the northwest Pacific subduction zone: Implications for rheology and geodynamics
作者: Han G.; Li J.; Guo G.; Mooney W.D.; Karato S.-I.; Yuen D.A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 554
语种: 英语
中文关键词: low velocity layer atop the 410 ; mantle transition zone ; Northwest Pacific subduction zone ; water-bearing MTZ ; waveform modeling ; wetting of grain boundary
英文关键词: Acoustic wave velocity ; Dihedral angle ; Grain boundaries ; Shear waves ; Silicate minerals ; Wave propagation ; 410-km discontinuity ; Continental margin ; Intermediate depths ; Low velocity layers ; Low viscosity zone ; Mantle transition zone ; Seismic velocities ; Subduction zones ; Shear flow ; continental margin ; geodynamics ; low velocity zone ; mantle structure ; rheology ; seismic velocity ; seismic wave ; subduction zone ; waveform analysis ; Pacific Ocean ; Pacific Ocean (Northwest)
英文摘要: Regional triplication waveforms of five intermediate-depth events are modeled to simultaneously obtain the compressional (P) and shear (SH) wave velocity structure beneath northwestern Pacific subduction zone. Both the P- and SH-wave velocity models for three different sub-regions show a low-velocity layer (LVL) with a thickness of ∼55-80 km lying above the 410-km discontinuity with a ∼900 km lateral extent from the Japan Sea to the northeastern Asian continental margin. With the dihedral angle approaching to zero around 400 km, a minute amount of melt atop the 410-km discontinuity caused by the hydrous slab might completely wet olivine grain boundaries and result in a low seismic velocity layer in this specific subduction zone. This mechanism suggests that the 410-LVL is a low viscosity zone that would partially decouple the upper mantle from the transition zone. We infer that the widespread 410-LVL provides evidence for a water-bearing mantle transition zone beneath the western Pacific subduction zone. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165491
Appears in Collections:气候变化与战略

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作者单位: Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China; Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing, 100029, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China; Mohe Observatory of Geophysics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China; United States Geological Survey, MS 977, 345 Middlefield Road, Menlo Park, CA 94025, United States; Department of Earth and Planetary Sciences, Yale University, New Haven, CT 06520, United States; Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, United States; Department of Computer Science, Geosciences, Ocean University of China, Shandong, Qingdao 266003, China

Recommended Citation:
Han G.,Li J.,Guo G.,et al. Pervasive low-velocity layer atop the 410-km discontinuity beneath the northwest Pacific subduction zone: Implications for rheology and geodynamics[J]. Earth and Planetary Science Letters,2021-01-01,554
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