Volcanic edifice slip events recorded on the fault plane of the San Andres Landslide, El Hierro, Canary Islands

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F20%3A00532845" target="_blank" >RIV/67985891:_____/20:00532845 - isvavai.cz</a>

Výsledek na webu

<a href="https://reader.elsevier.com/reader/sd/pii/S0040195119304329?token=EB9FC3E42D12336F3D353B5BFD480A4E1C3B6E69E7CE5BAB0E5C5D475C037B5DD598D5ED76DF16198117E117519B765C" target="_blank" >https://reader.elsevier.com/reader/sd/pii/S0040195119304329?token=EB9FC3E42D12336F3D353B5BFD480A4E1C3B6E69E7CE5BAB0E5C5D475C037B5DD598D5ED76DF16198117E117519B765C</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.tecto.2019.228317" target="_blank" >10.1016/j.tecto.2019.228317</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Volcanic edifice slip events recorded on the fault plane of the San Andres Landslide, El Hierro, Canary Islands

Popis výsledku v původním jazyce

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 Andres 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 He-3 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 Andres Landslide. It is also believed to be the first time a silica layer resulting from frictional melt has been described in a volcanic setting.

Název v anglickém jazyce

Volcanic edifice slip events recorded on the fault plane of the San Andres Landslide, El Hierro, Canary Islands

Popis výsledku anglicky

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 Andres 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 He-3 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 Andres Landslide. It is also believed to be the first time a silica layer resulting from frictional melt has been described in a volcanic setting.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GJ16-12227Y" target="_blank" >GJ16-12227Y: Dynamika megasesuvu na El Hierru analyzovaná pomocí "big data" za účelem predikce budoucího chování megasesuvů i na dalších vulkanických ostrovech</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Tectonophysics

ISSN

0040-1951

e-ISSN

—

Svazek periodika

776

Číslo periodika v rámci svazku

FEB 5

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

14

Strana od-do

228317

Kód UT WoS článku

000518493400004

EID výsledku v databázi Scopus

2-s2.0-85077649423