DOI: 10.1002/2014GL062547
论文题名: The Ronda peridotite (Spain): A natural template for seismic anisotropy in subduction wedges
作者: Précigout J. ; Almqvist B.S.G.
刊名: Geophysical Research Letters
ISSN: 0094-9491
EISSN: 1944-9222
出版年: 2014
卷: 41, 期: 24 起始页码: 8752
结束页码: 8758
语种: 英语
英文关键词: ductile flow
; lattice-preferred orientation
; mantle shear zone
; shear wave splitting
Scopus关键词: Anisotropy
; Grain boundaries
; Grain boundary sliding
; Olivine
; Seismology
; Shear flow
; Silicate minerals
; Structural geology
; Ductile flow
; Geophysical observations
; Intermediate temperatures
; Lattice preferred orientation
; Seismic anisotropy
; Shear wave splitting
; Shear zone
; Shear-wave anisotropy
; Shear waves
; dislocation creep
; ductile deformation
; grain boundary
; mantle
; olivine
; peridotite
; S-wave
; seismic anisotropy
; subduction
; Andalucia
; Malaga [Andalucia]
; Ronda
; Spain
英文摘要: The origin of seismic anisotropy in mantle wedges remains elusive. Here we provide documentation of shear wave anisotropy (AVs) inferred from mineral fabric across a lithosphere-scale vestige of deformed mantle wedge in the Ronda peridotite. As predicted for most subduction wedges, this natural case exposes a transition from A-type to B-type olivine fabric that occurs with decreasing temperature and enhanced grain boundary sliding at the expense of dislocation creep. We show that B-type fabric AVs (maximum of 6%) does not support geophysical observations and modeling, which requires 8% AVs. However, an observed transitional olivine fabric (A/B) develops at intermediate temperatures (800-1000°C) and can generate AVs ≥ 8%. We predict that the A/B-type fabric can account for shear wave splitting in contrasting subduction settings, exemplified by the Ryukyu and Honshu subduction wedges. The Ronda peridotite therefore serves as a natural template to decipher the mantle wedge deformation from seismic anisotropy. Key Points Origin of seismic anisotropy and inferred mantle dynamics in subduction zonesNatural documentation of olivine fabric across a paleolithosphereTransitional olivine fabric as source for shear wave splitting in mantle wedges ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921808099&doi=10.1002%2f2014GL062547&partnerID=40&md5=98fda29b29240e1dfb67fec18fb091b6
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6755
Appears in Collections: 气候减缓与适应
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作者单位: Institut des Sciences de la Terre d'Orléans, UMR-CNRS 7327, Université d'Orléans, Orléans, France
Recommended Citation:
Précigout J.,Almqvist B.S.G.. The Ronda peridotite (Spain): A natural template for seismic anisotropy in subduction wedges[J]. Geophysical Research Letters,2014-01-01,41(24).