气候变化领域集成服务门户(CCPortal): Volcanic edifice slip events recorded on the fault plane of the San Andrés Landslide, El Hierro, Canary Islands

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DOI	10.1016/j.tecto.2019.228317
	Volcanic edifice slip events recorded on the fault plane of the San Andrés Landslide, El Hierro, Canary Islands
	Blahůt J.; Mitrovic-Woodell I.; Baroň I.; René M.; Rowberry M.; Blard P.-H.; Hartvich F.; Balek J.; Meletlidis S.
发表日期	2020
ISSN	00401951
卷号	776
英文摘要	Volcanic flank collapses often result in giant debris avalanches that are capable of travelling tens of kilometres across the ocean floor and generating tsunamis that devastate distant communities. The San Andrés Landslide on El Hierro, Canary Islands, represents one of the few places in the world where it is possible to investigate the landslide mass and fault planes of a volcanic collapse structure. In this study, a new conceptual model for the development of this enormous slump is presented on the basis of structural geological and geomorphological measurements, petrological and microstructural analyses, and cosmogenic radionuclide dating. Structural geological and geomorphological measurements indicate that the fault plane records two distinct events. Petrological and microstructural analyses demonstrate that a thin layer of frictionite covers the surface of the fault in contact with an oxidised tectonic breccia that transitions into the underlying undeformed basanite host rock. This frictionite comprises a heterogeneous cataclastic layer and a translucent silica layer that are interpreted to represent two separate slip events on the basis of their architecture and crosscutting relationships. Cosmogenic 3He dating reveals a maximum exposure age of 183 ± 17 ka to 52 ± 17 ka. Arguments are presented in support of the idea that the first slip event took place between 545 ka and 430 ka, prior to significant clockwise rotation of El Hierro, and the second slip event took place between 183 ka and 52 ka, perhaps in association with one of the giant debris avalanches that occurred around that time. This is the first time that more than one slip event has been recognised from the fault plane of the San Andrés Landslide. It is also believed to be the first time a silica layer resulting from frictional melt has been described in a volcanic setting. © 2020 Elsevier B.V.
关键词	Canary Islands Cataclasis metamorphism Cosmogenic radionuclide dating Frictionite Silica layer Volcanic collapse
英文关键词	Debris; Gasoline; Landslides; Petrology; Radioisotopes; Silica; Structural geology; Volcanoes; Canary islands; Cataclasis; Cosmogenic radionuclides; Frictionite; Silica layers; Volcanic collapse; Fault slips; collapse structure; fault plane; fault slip; landslide; metamorphism; radiocarbon dating; silica; volcano; Canary Islands; Hierro; Santa Cruz de Tenerife [(PRV) Canary Islands]; Spain
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/207718
作者单位	Institute of Rock Structure and Mechanics, The Czech Academy of Sciences, V Holešovičkách 41, Prague 8, 182 09, Czech Republic; Department of Geodynamics and Sedimentology, University of Vienna, Althanstraße 14, Vienna, 1090, Austria; Centre de Recherches Pétrographiques et Géochimiques (CRPG), UMR 7358, CNRS - Université de Lorraine, 15 rue Notre Dame des Pauvres, Vandœuvre-lès-Nancy, 54500, France; Centro Geofísico de Canarias, Instituto Geográfico Nacional, Calle Marina 20, Santa Cruz de Tenerife, 38001, Spain
推荐引用方式 GB/T 7714	Blahůt J.,Mitrovic-Woodell I.,Baroň I.,et al. Volcanic edifice slip events recorded on the fault plane of the San Andrés Landslide, El Hierro, Canary Islands[J],2020,776.
APA	Blahůt J..,Mitrovic-Woodell I..,Baroň I..,René M..,Rowberry M..,...&Meletlidis S..(2020).Volcanic edifice slip events recorded on the fault plane of the San Andrés Landslide, El Hierro, Canary Islands.Tectonophysics,776.
MLA	Blahůt J.,et al."Volcanic edifice slip events recorded on the fault plane of the San Andrés Landslide, El Hierro, Canary Islands".Tectonophysics 776(2020).