气候变化领域集成服务门户(CCPortal): Dynamics of the Gibraltar Arc System: A Complex Interaction Between Plate Convergence, Slab Pull, and Mantle Flow

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DOI	10.1029/2019JB018873
	Dynamics of the Gibraltar Arc System: A Complex Interaction Between Plate Convergence, Slab Pull, and Mantle Flow
	Civiero C.; Custódio S.; Duarte J.C.; Mendes V.B.; Faccenna C.
发表日期	2020
ISSN	21699313
卷号	125 期号:7
英文摘要	In typical subduction systems, plate convergence is subperpendicular to the trench. The Gibraltar Arc System is exceptional, with its narrow subduction arc oriented N-S and laterally “squeezed” by the NNW-SSE tectonic convergence between Nubia and Iberia. The extent to which the slab is still coupled to the surface and how it interacts actively with the surrounding mantle is a matter of ongoing debate. Here, we analyze new densely spaced GPS data, together with crustal and mantle observations, to better understand the slab kinematics, plate dynamics, and mantle flow. In light of previous and current research, we find that subduction below the Gibraltar Arc is currently in the middle of a disruption process, with parts of it already detached and others yet coupled to the surface. In particular, the slab seems to be detached to the north of the Gibraltar Strait, with a small portion still attached to the surface or in the process of detaching below the western Betics. South of Gibraltar, the slab is still coupled to the overriding plate, although the subduction seems to be very slow or stopped. Flow of mantle material around the detached portions of the slab causes most of the surface uplift and a positive residual topography anomaly. Our findings show that the interplay between slab dynamics, mantle flow, and plate convergence explains much of the observed residual topography, surface motion, seismicity, and mantle structure. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Gibraltar Arc; mantle flow; plate convergence; slab pull; subduction zone; surface deformation
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/187764
作者单位	Geophysics Section, Dublin Institute for Advanced Studies (DIAS), Dublin, Ireland; Instituto Dom Luiz (IDL), Faculdade de Ciências, Universidade de Lisboa, Lisbon, Portugal; Departamento de Geologia, Faculdade de Ciências, Universidade de Lisboa, Lisbon, Portugal; School of Earth, Atmosphere and Environment, Monash University, Melbourne, VIC, Australia; Dipartimento di Scienze Geologiche, Università di Roma Tre, Rome, Italy
推荐引用方式 GB/T 7714	Civiero C.,Custódio S.,Duarte J.C.,et al. Dynamics of the Gibraltar Arc System: A Complex Interaction Between Plate Convergence, Slab Pull, and Mantle Flow[J],2020,125(7).
APA	Civiero C.,Custódio S.,Duarte J.C.,Mendes V.B.,&Faccenna C..(2020).Dynamics of the Gibraltar Arc System: A Complex Interaction Between Plate Convergence, Slab Pull, and Mantle Flow.Journal of Geophysical Research: Solid Earth,125(7).
MLA	Civiero C.,et al."Dynamics of the Gibraltar Arc System: A Complex Interaction Between Plate Convergence, Slab Pull, and Mantle Flow".Journal of Geophysical Research: Solid Earth 125.7(2020).