DOI: 10.1016/j.tecto.2019.228317
论文题名: Volcanic edifice slip events recorded on the fault plane of the San Andrés Landslide, El Hierro, Canary Islands
作者: Blahůt J. ; Mitrovic-Woodell I. ; Baroň I. ; René M. ; Rowberry M. ; Blard P.-H. ; Hartvich F. ; Balek J. ; Meletlidis S.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 776 语种: 英语
中文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170552
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
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]. Tectonophysics,2020-01-01,776