气候变化领域集成服务门户(CCPortal): Detailed Structure of the Subducted Nazca Slab into the Lower Mantle Derived From Continent-Scale Teleseismic P Wave Tomography

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DOI	10.1029/2019JB017884
	Detailed Structure of the Subducted Nazca Slab into the Lower Mantle Derived From Continent-Scale Teleseismic P Wave Tomography
	Portner D.E.; Rodríguez E.E.; Beck S.; Zandt G.; Scire A.; Rocha M.P.; Bianchi M.B.; Ruiz M.; França G.S.; Condori C.; Alvarado P.
发表日期	2020
ISSN	21699313
卷号	125 期号:5
英文摘要	Nazca subduction beneath South America is one of our best modern examples of long-lived ocean-continent subduction on the planet, serving as a foundation for our understanding of subduction processes. Within that framework, persistent heterogeneities at a range of scales in both the South America and Nazca plates is difficult to reconcile without detailed knowledge of the subducted Nazca slab structure. Here we use teleseismic travel time residuals from >1,000 broadband and short-period seismic stations across South America in a single tomographic inversion to produce the highest-resolution contiguous P wave tomography model of the subducting slab and surrounding mantle beneath South America to date. Our model reveals a continuous trench-parallel fast seismic velocity anomaly across the majority of South America that is consistent with the subducting Nazca slab. The imaged anomaly indicates a number of robust features of the subducted slab, including variable slab dip, extensive lower mantle penetration, slab stagnation in the lower mantle, and variable slab amplitude, that are incorporated into a new, comprehensive model of the geometry of the Nazca slab surface to ~1,100 km depth. Lower mantle slab penetration along the entire margin suggests that lower mantle slab anchoring is insufficient to explain along strike upper plate variability while slab stagnation in the lower mantle indicates that the 1,000 km discontinuity is dominant beneath South America. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	mantle transition zone; Nazca slab; seismic imaging; South America; subduction dynamics; teleseismic tomography
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187870
作者单位	Department of Geosciences, University of Arizona, Tucson, AZ, United States; Now at Department of Terrestrial Magnetism, Carnegie Institution for Science, Washington, DC, United States; IRIS PASSCAL Instrument Center, New Mexico Institute of Mining and Technology, Socorro, NM, United States; Instituto de Geociências, Universidade de Brasília, Brasília, Brazil; Centro de Sismologia, Departamento de Geofísica, Instituto de Geofísica, Astronomia, e Ciências Atmosféricas, Universidade de São Paulo, São Paulo, Brazil; Instituto Geofísico, Escuela Politécnica Nacional, Quito, Ecuador; Consejo Nacional de Investigaciones Científicas y Técnicas, Departamento de Geofísica y Astronomía, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, San Juan, Argentina
推荐引用方式 GB/T 7714	Portner D.E.,Rodríguez E.E.,Beck S.,et al. Detailed Structure of the Subducted Nazca Slab into the Lower Mantle Derived From Continent-Scale Teleseismic P Wave Tomography[J],2020,125(5).
APA	Portner D.E..,Rodríguez E.E..,Beck S..,Zandt G..,Scire A..,...&Alvarado P..(2020).Detailed Structure of the Subducted Nazca Slab into the Lower Mantle Derived From Continent-Scale Teleseismic P Wave Tomography.Journal of Geophysical Research: Solid Earth,125(5).
MLA	Portner D.E.,et al."Detailed Structure of the Subducted Nazca Slab into the Lower Mantle Derived From Continent-Scale Teleseismic P Wave Tomography".Journal of Geophysical Research: Solid Earth 125.5(2020).