DOI: 10.1002/2014GL061372
论文题名: Defining a proxy for the interpretation of seismic anisotropy in non-Newtonian mantle flows
作者: Hedjazian N. ; Kaminski E.
刊名: Geophysical Research Letters
ISSN: 0094-9676
EISSN: 1944-9407
出版年: 2014
卷: 41, 期: 20 起始页码: 7065
结束页码: 7072
语种: 英语
英文关键词: dynamic recrystallization
; lattice preferred orientation
; mid-ocean ridge
; seismic anisotropy
; subduction zone
; upper mantle flow
Scopus关键词: Anisotropy
; Dynamic recrystallization
; Seismology
; Strain
; Strain rate
; Structural geology
; Lattice preferred orientation
; Mid-ocean ridges
; Seismic anisotropy
; Subduction zones
; Upper mantle
; Non Newtonian flow
; deformation mechanism
; mid-ocean ridge
; recrystallization
; rheology
; seismic anisotropy
; subduction zone
; upper mantle
英文摘要: Seismic anisotropy can provide unique insights on convection in the upper mantle. Here we study the link between seismic anisotropy and mantle flow using a non-Newtonian rheology consistent with deformation by dislocation creep. Using analytical first-order flow models underneath a ridge and in subduction zones, we find that finite strain ellipsoid (FSE) is a robust proxy of seismic anisotropy, both in terms of orientation and strength, for natural strains smaller than ≈ 1. At larger strains, anisotropy aligns with the "infinite strain axis" (ISA), defined as the orientation of the long axis of the FSE in the limit of infinite strain, and its percentage reaches a plateau. Anisotropy aligns with the flow direction only when the product of the inverse strain rate with the timescale of ISA rotation within the flow is smaller than 0.1. Key PointsWe consider non-Newtonian flows consistent with dislocation creepSeismic anisotropy rises from plastic deformation and dynamic recrystallizationWe define a proxy based on finite strain to interpret seismic anisotropy ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911443147&doi=10.1002%2f2014GL061372&partnerID=40&md5=cbac7667a99ccaa89ddb29b683b33f31
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6940
Appears in Collections: 气候减缓与适应
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作者单位: Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, Paris, France
Recommended Citation:
Hedjazian N.,Kaminski E.. Defining a proxy for the interpretation of seismic anisotropy in non-Newtonian mantle flows[J]. Geophysical Research Letters,2014-01-01,41(20).