DOI: 10.1002/2015GL063420
论文题名: Rayleigh wave dispersion measurements reveal low-velocity zones beneath the new crust in the Gulf of California
作者: Persaud P. ; Di Luccio F. ; Clayton R.W.
刊名: Geophysical Research Letters
ISSN: 0094-8843
EISSN: 1944-8574
出版年: 2015
卷: 42, 期: 6 起始页码: 1766
结束页码: 1774
语种: 英语
英文关键词: lower crustal flow
; oblique rifting
; off-axis partial melt
; surface wave tomography
Scopus关键词: Melting
; Percolation (fluids)
; Rayleigh waves
; Shear waves
; Surface waves
; Tectonics
; Tomography
; Transform faults
; Velocity
; Wave propagation
; Lower crustal flows
; Magmatic evolution
; oblique rifting
; Partial melt
; Rayleigh wave tomography
; Rayleigh-wave dispersion
; Shear wave velocity structure
; Surface-wave tomography
; Shear flow
; continental crust
; low velocity zone
; magmatism
; mantle
; oblique fault
; partial melting
; Rayleigh wave
; upwelling
; wave velocity
; Guaymas Basin
; Gulf of California
; Pacific Ocean
英文摘要: Rayleigh wave tomography provides images of the shallow mantle shear wave velocity structure beneath the Gulf of California. Low-velocity zones (LVZs) are found on axis between 26 and 50km depth beneath the Guaymas Basin but mostly off axis under the other rift basins, with the largest feature underlying the Ballenas Transform Fault. We interpret the broadly distributed LVZs as regions of partial melting in a solid mantle matrix. The pathway for melt migration and focusing is more complex than an axis-centered source aligned above a deeper region of mantle melt and likely reflects the magmatic evolution of rift segments. We also consider the existence of solid lower continental crust in the Gulf north of the Guaymas Basin, where the association of the LVZs with asthenospheric upwelling suggests lateral flow assisted by a heat source. These results provide key constraints for numerical models of mantle upwelling and melt focusing in this young oblique rift. Key Points Low velocities in the Gulf upper mantle are interpreted as partial melting Partial melting under the Guaymas Basin and off axis of the other rift basins Lower crustal flow assisted by heat source in N Gulf near mantle upwelling ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84927720445&doi=10.1002%2f2015GL063420&partnerID=40&md5=d5ba7591be4aa7623cb5c32eaf231ede
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8459
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: California Institute of Technology Seismological Laboratory, Pasadena, CA, United States
Recommended Citation:
Persaud P.,Di Luccio F.,Clayton R.W.. Rayleigh wave dispersion measurements reveal low-velocity zones beneath the new crust in the Gulf of California[J]. Geophysical Research Letters,2015-01-01,42(6).