DOI: 10.1016/j.epsl.2018.07.024
Scopus记录号: 2-s2.0-85050668109
论文题名: A common deep source for upper-mantle upwellings below the Ibero-western Maghreb region from teleseismic P-wave travel-time tomography
作者: Civiero C. ; Strak V. ; Custódio S. ; Silveira G. ; Rawlinson N. ; Arroucau P. ; Corela C.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 499 起始页码: 157
结束页码: 172
语种: 英语
英文关键词: Canary mantle plume
; Ibero-western Maghreb region
; mantle transition zone
; mantle upwellings
; P-wave tomography
; subduction-induced mantle flow
Scopus关键词: Seismic waves
; Tomography
; Wave propagation
; Maghreb
; Mantle flow
; Mantle plume
; Mantle transition zone
; Mantle upwellings
; P waves
; Structural geology
; mantle plume
; mantle source
; P-wave
; seismic tomography
; seismic velocity
; subduction
; teleseismic wave
; transition zone
; travel time
; upper mantle
; Maghreb
英文摘要: Upper-mantle upwellings are often invoked as the cause of Cenozoic volcanism in the Ibero-western Maghreb region. However, their nature, geometry and origin are unclear. This study takes advantage of dense seismic networks, which cover an area extending from the Pyrenees in the north to the Canaries in the south, to provide a new high-resolution P-wave velocity model of the upper-mantle and topmost lower-mantle structure. Our images show three subvertical upper-mantle upwellings below the Canaries, the Atlas Ranges and the Gibraltar Arc, which appear to be rooted beneath the upper-mantle transition zone (MTZ). Two other mantle upwellings beneath the eastern Rif and eastern Betics surround the Gibraltar subduction zone. We propose a new geodynamic model in which narrow upper-mantle upwellings below the Canaries, the Atlas Ranges and the Gibraltar Arc rise from a laterally-propagating layer of material below the MTZ, which in turn is fed by a common deep source below the Canaries. In the Gibraltar region, the deeply rooted upwelling interacts with the Gibraltar slab. Quasi-toroidal flow driven by slab rollback induces the hot mantle material to flow around the slab, creating the two low-velocity anomalies below the eastern Betics and eastern Rif. Our results suggest that the Central Atlantic plume is a likely source of hot mantle material for upper-mantle upwellings in the Ibero-western Maghreb region. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109708
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: Instituto Dom Luiz (IDL), Faculdade de Ciências, Universidade de Lisboa, Lisboa, 1749-016, Portugal; Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, HV 1081, Netherlands; Instituto Superior de Engenharia de Lisboa, Lisboa, 1959-007, Portugal; Bullard Laboratories, Department of Earth Sciences, University of Cambridge, Cambridge, CB30EZ, United Kingdom; Dublin Institute for Advanced Studies (DIAS), Dublin, D02 Y006, Ireland
Recommended Citation:
Civiero C.,Strak V.,Custódio S.,et al. A common deep source for upper-mantle upwellings below the Ibero-western Maghreb region from teleseismic P-wave travel-time tomography[J]. Earth and Planetary Science Letters,2018-01-01,499