Deformation structures associated with the Tazo landslide (La Gomera, Canary Islands)

Deformation structures below the basal plane of gravitational slides can provide useful information about the state of stress undergone by rocks prior to the sliding process and about the triggering forces acting at each particular sliding event. In the present work we conducted a structural analysi...

Descripción completa

Detalles Bibliográficos
Autores: Fernández Rodríguez, Carlos, García Navarro, Encarnación, Cadillas, Ramón, Colmenero, Juan Ramón, Martín Luis, María Candelaria
Tipo de recurso: artículo
Fecha de publicación:2010
País:España
Institución:Universidad de Huelva (UHU)
Repositorio:Arias Montano. Repositorio Institucional de la Universidad de Huelva
Idioma:inglés
OAI Identifier:oai:ariasmontano.uhu.es:10272/4624
Acceso en línea:http://hdl.handle.net/10272/4624
Access Level:acceso abierto
Palabra clave:Volcanes -- España
Vulcanismo
Emplacement mechanisms
Sector collapse
Flank collapse
Cantal volcano
Stratigraphy
id ES_c489bd7b88c4bf5933b9dd2a18d44d9e
oai_identifier_str oai:ariasmontano.uhu.es:10272/4624
network_acronym_str ES
network_name_str España
repository_id_str
spelling Deformation structures associated with the Tazo landslide (La Gomera, Canary Islands)Fernández Rodríguez, CarlosGarcía Navarro, EncarnaciónCadillas, RamónColmenero, Juan RamónMartín Luis, María CandelariaVolcanes -- EspañaVulcanismoEmplacement mechanismsSector collapseFlank collapseCantal volcanoStratigraphyDeformation structures below the basal plane of gravitational slides can provide useful information about the state of stress undergone by rocks prior to the sliding process and about the triggering forces acting at each particular sliding event. In the present work we conducted a structural analysis of the rocks below the surface of the gravitational slide of Tazo (La Gomera, Canary Islands) and determined the epigenetic processes involved in the filling of the amphitheatre. We also inferred the possible triggering phenomena related to the Tazo landslide. The rocks located below the surface of the gravitational slide of Tazo -i.e., the basaltic lava flows, sills and dikes of the Lower Old Edifice and the submarine volcanic rocks, gabbros, pyroxenites and dikes of the Basal Complex of La Gomera- are strongly deformed close to this sliding surface. The lava flows and dikes of the Lower Old Edifice are folded, with fault breccias and gouges, and locally foliated, defining the sliding surface. The dikes of the Basal Complex are also folded, and the gabbros and pyroxenites are affected by a large number of small faults. In the Basal Complex, the sliding surface is defined by a foliated granular gouge. In the damage zone, the Basal Complex rocks show an incipient fracture cleavage. The sliding amphitheatre has been filled by the debris avalanche or cohesive debris flow generated within the slide, as well as by later debris flows, hyperconcentrated flows, sheet flows, and by interspersed lava flows from the Upper Old Edifice. We suggest here that the collapse of the north-western flank of the Lower Old Edifice at Tazo could in part have been triggered by continuous magma injection, associated with the emplacement of dikes in a rift zone with an ENE-WSW direction, enhanced by the mechanical weakness of the Basal Complex unit, which was affected by hydrothermal metamorphism under greenschist facies conditions and by the displacement along the Montana de Alcala and Guillama normal faults, which are deeply entrenched in the altered rocks of the Basal ComplexSpringerUniversidad de Huelva. Departamento de Geodinámica y Paleontología20102010-01-0120102010-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10272/4624reponame:Arias Montano. Repositorio Institucional de la Universidad de Huelvainstname:Universidad de Huelva (UHU)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:ariasmontano.uhu.es:10272/46242026-06-02T14:58:11Z
dc.title.none.fl_str_mv Deformation structures associated with the Tazo landslide (La Gomera, Canary Islands)
title Deformation structures associated with the Tazo landslide (La Gomera, Canary Islands)
spellingShingle Deformation structures associated with the Tazo landslide (La Gomera, Canary Islands)
Fernández Rodríguez, Carlos
Volcanes -- España
Vulcanismo
Emplacement mechanisms
Sector collapse
Flank collapse
Cantal volcano
Stratigraphy
title_short Deformation structures associated with the Tazo landslide (La Gomera, Canary Islands)
title_full Deformation structures associated with the Tazo landslide (La Gomera, Canary Islands)
title_fullStr Deformation structures associated with the Tazo landslide (La Gomera, Canary Islands)
title_full_unstemmed Deformation structures associated with the Tazo landslide (La Gomera, Canary Islands)
title_sort Deformation structures associated with the Tazo landslide (La Gomera, Canary Islands)
dc.creator.none.fl_str_mv Fernández Rodríguez, Carlos
García Navarro, Encarnación
Cadillas, Ramón
Colmenero, Juan Ramón
Martín Luis, María Candelaria
author Fernández Rodríguez, Carlos
author_facet Fernández Rodríguez, Carlos
García Navarro, Encarnación
Cadillas, Ramón
Colmenero, Juan Ramón
Martín Luis, María Candelaria
author_role author
author2 García Navarro, Encarnación
Cadillas, Ramón
Colmenero, Juan Ramón
Martín Luis, María Candelaria
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidad de Huelva. Departamento de Geodinámica y Paleontología
dc.subject.none.fl_str_mv Volcanes -- España
Vulcanismo
Emplacement mechanisms
Sector collapse
Flank collapse
Cantal volcano
Stratigraphy
topic Volcanes -- España
Vulcanismo
Emplacement mechanisms
Sector collapse
Flank collapse
Cantal volcano
Stratigraphy
description Deformation structures below the basal plane of gravitational slides can provide useful information about the state of stress undergone by rocks prior to the sliding process and about the triggering forces acting at each particular sliding event. In the present work we conducted a structural analysis of the rocks below the surface of the gravitational slide of Tazo (La Gomera, Canary Islands) and determined the epigenetic processes involved in the filling of the amphitheatre. We also inferred the possible triggering phenomena related to the Tazo landslide. The rocks located below the surface of the gravitational slide of Tazo -i.e., the basaltic lava flows, sills and dikes of the Lower Old Edifice and the submarine volcanic rocks, gabbros, pyroxenites and dikes of the Basal Complex of La Gomera- are strongly deformed close to this sliding surface. The lava flows and dikes of the Lower Old Edifice are folded, with fault breccias and gouges, and locally foliated, defining the sliding surface. The dikes of the Basal Complex are also folded, and the gabbros and pyroxenites are affected by a large number of small faults. In the Basal Complex, the sliding surface is defined by a foliated granular gouge. In the damage zone, the Basal Complex rocks show an incipient fracture cleavage. The sliding amphitheatre has been filled by the debris avalanche or cohesive debris flow generated within the slide, as well as by later debris flows, hyperconcentrated flows, sheet flows, and by interspersed lava flows from the Upper Old Edifice. We suggest here that the collapse of the north-western flank of the Lower Old Edifice at Tazo could in part have been triggered by continuous magma injection, associated with the emplacement of dikes in a rift zone with an ENE-WSW direction, enhanced by the mechanical weakness of the Basal Complex unit, which was affected by hydrothermal metamorphism under greenschist facies conditions and by the displacement along the Montana de Alcala and Guillama normal faults, which are deeply entrenched in the altered rocks of the Basal Complex
publishDate 2010
dc.date.none.fl_str_mv 2010
2010-01-01
2010
2010-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10272/4624
url http://hdl.handle.net/10272/4624
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
dc.source.none.fl_str_mv reponame:Arias Montano. Repositorio Institucional de la Universidad de Huelva
instname:Universidad de Huelva (UHU)
instname_str Universidad de Huelva (UHU)
reponame_str Arias Montano. Repositorio Institucional de la Universidad de Huelva
collection Arias Montano. Repositorio Institucional de la Universidad de Huelva
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869418889987751936
score 15,198674

Similares en LA Referencia