气候变化领域集成服务门户(CCPortal): Crustal and upper-mantle structure of the Eastern Caribbean and Northern Venezuela from passive Rayleigh wave tomography

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DOI	10.1016/j.tecto.2020.228711
	Crustal and upper-mantle structure of the Eastern Caribbean and Northern Venezuela from passive Rayleigh wave tomography
	Arnaiz-Rodríguez M.S.; Zhao Y.; Sánchez-Gamboa A.K.; Audemard F.
发表日期	2021
ISSN	00401951
卷号	804
英文摘要	We explore the shear-wave lithospheric velocity structure of the Eastern Caribbean and Northern Venezuela using ambient noise tomography with stations deployed around the study area. We construct cross-correlation functions from continuous seismic records, and measure phase velocities of fundamental-mode Rayleigh waves. These velocities are further projected onto 0.6°x0.6° phase velocity grids for each period between 5 s and 50 s. The pseudo-dispersion curve at each grid point is inverted for 1D shear velocity profiles by using a Markov Chain Monte Carlo scheme. The interpolated 3D velocity model shows that the mean shear velocity of the Eastern Caribbean lithospheric mantle is lower than the global average, which is in agreement with values reported in other large igneous provinces. We interpret that low velocities in the lithospheric keel are associated with an anomalous composition and/or an elevated thermal state; this gives the Caribbean plate a high buoyancy that determines the subduction polarities in the region. The results also indicate that: (a) the mantle beneath Northern Venezuela retains compositional anomalies related to extension processes of different ages; (b) the overriding of the Caribbean plate by the Great Antilles arc seems to be much slower than previously suggested; and (c) the localized volcanism in the center of the Lesser Antilles arc is related to asthenospheric flow through the tear induced on the subducted slab by major strike-slip faults. © 2020 Elsevier B.V.
关键词	Ambient noise tomography Eastern Caribbean Large igneous province Monte Carlo inversion Subduction
英文关键词	3D modeling; Markov chains; Phase velocity; Plates (structural components); Rayleigh waves; Shear waves; Strike-slip faults; Structural geology; Tomography; Velocity; Ambient noise tomographies; Cross-correlation function; Large igneous provinces; Lithospheric mantle; Lithospheric velocity structure; Markov Chain Monte-Carlo; Rayleigh wave tomography; Upper mantle structure; Shear flow; ambient noise; asthenosphere; crustal structure; large igneous province; mantle structure; Markov chain; Monte Carlo analysis; Rayleigh wave; seismic tomography; structural geology; upper mantle; velocity structure; Caribbean Islands; Venezuela
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207937
作者单位	Departamento de Geofísica, Escuela de Geología, Minas y Geofísica, Facultad de Ingeniería, Universidad Central de Venezuela, Venezuela; Center of Global and Applied Seismology, The Unconventional Oil and Gas Institute, China University of Petroleum at Beijing, China; Departamento de Geología, Facultad de Ingeniería, Universidad Central de Venezuela, Caracas, DC, Venezuela
推荐引用方式 GB/T 7714	Arnaiz-Rodríguez M.S.,Zhao Y.,Sánchez-Gamboa A.K.,et al. Crustal and upper-mantle structure of the Eastern Caribbean and Northern Venezuela from passive Rayleigh wave tomography[J],2021,804.
APA	Arnaiz-Rodríguez M.S.,Zhao Y.,Sánchez-Gamboa A.K.,&Audemard F..(2021).Crustal and upper-mantle structure of the Eastern Caribbean and Northern Venezuela from passive Rayleigh wave tomography.Tectonophysics,804.
MLA	Arnaiz-Rodríguez M.S.,et al."Crustal and upper-mantle structure of the Eastern Caribbean and Northern Venezuela from passive Rayleigh wave tomography".Tectonophysics 804(2021).