Tectonic evolution of a continental subduction‐exhumation channel: Variscan structure of the basal allochthonous units in NW Spain

A regional study starting from detailed geological mapping has been carried out in the Malpica‐Tui Complex of Galicia in NW Spain. The complex is formed by two units representing pieces of the external edge of Gondwana, subducted and exhumed during the Variscan collision. The study shows that synsub...

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Detalles Bibliográficos
Autores: Díez Fernández, Rubén, Martínez Catalán, José Ramón, Arenas Martín, Ricardo, Abati Gómez, Jacobo
Tipo de recurso: artículo
Fecha de publicación:2011
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/42446
Acceso en línea:https://hdl.handle.net/20.500.14352/42446
Access Level:acceso abierto
Palabra clave:551.24(234.1)
Tectonic evolution
Variscan structure
NW Spain
Geodinámica
2507 Geofísica
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spelling Tectonic evolution of a continental subduction‐exhumation channel: Variscan structure of the basal allochthonous units in NW SpainDíez Fernández, RubénMartínez Catalán, José RamónArenas Martín, RicardoAbati Gómez, Jacobo551.24(234.1)Tectonic evolutionVariscan structureNW SpainGeodinámica2507 GeofísicaA regional study starting from detailed geological mapping has been carried out in the Malpica‐Tui Complex of Galicia in NW Spain. The complex is formed by two units representing pieces of the external edge of Gondwana, subducted and exhumed during the Variscan collision. The study shows that synsubduction and early synexhumation structures in continental subduction channels tends to be obscured and even erased once exhumation is complete. Detailed structural analysis, matched with the knowledge of the history, and available data for other Galician basal units have elucidated the major structures developed during the subduction‐exhumation process. The results include evidence of the plate convergence causing early Variscan continental subduction of the Gondwana margin. Subduction was followed by exhumation driven by ductile thrusting within the subduction channel, which, in turn, provoked crustal duplication in the subducted slab and modified the initial tectonometamorphic architecture of the subduction wedge. The next step was accretion to the adjacent continental domains, placing the subduction wedge on top of unsubducted parts of the Gondwana margin via ductile thrusting. Thrusting was preceded by progressive propagation of a train of recumbent folds toward the foreland that affected the previous structural stack. Subsequent transference of oceanic (Rheic) and peri‐Gondwanan terranes to the Gondwana margin took place by out‐of‐sequence thrusting followed by crustal extensional collapse and strike‐slip tectonicsEuropean Geoscience UnionUniversidad Complutense de Madrid20112011-01-0120112011-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/42446reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/424462026-06-02T12:44:21Z
dc.title.none.fl_str_mv Tectonic evolution of a continental subduction‐exhumation channel: Variscan structure of the basal allochthonous units in NW Spain
title Tectonic evolution of a continental subduction‐exhumation channel: Variscan structure of the basal allochthonous units in NW Spain
spellingShingle Tectonic evolution of a continental subduction‐exhumation channel: Variscan structure of the basal allochthonous units in NW Spain
Díez Fernández, Rubén
551.24(234.1)
Tectonic evolution
Variscan structure
NW Spain
Geodinámica
2507 Geofísica
title_short Tectonic evolution of a continental subduction‐exhumation channel: Variscan structure of the basal allochthonous units in NW Spain
title_full Tectonic evolution of a continental subduction‐exhumation channel: Variscan structure of the basal allochthonous units in NW Spain
title_fullStr Tectonic evolution of a continental subduction‐exhumation channel: Variscan structure of the basal allochthonous units in NW Spain
title_full_unstemmed Tectonic evolution of a continental subduction‐exhumation channel: Variscan structure of the basal allochthonous units in NW Spain
title_sort Tectonic evolution of a continental subduction‐exhumation channel: Variscan structure of the basal allochthonous units in NW Spain
dc.creator.none.fl_str_mv Díez Fernández, Rubén
Martínez Catalán, José Ramón
Arenas Martín, Ricardo
Abati Gómez, Jacobo
author Díez Fernández, Rubén
author_facet Díez Fernández, Rubén
Martínez Catalán, José Ramón
Arenas Martín, Ricardo
Abati Gómez, Jacobo
author_role author
author2 Martínez Catalán, José Ramón
Arenas Martín, Ricardo
Abati Gómez, Jacobo
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 551.24(234.1)
Tectonic evolution
Variscan structure
NW Spain
Geodinámica
2507 Geofísica
topic 551.24(234.1)
Tectonic evolution
Variscan structure
NW Spain
Geodinámica
2507 Geofísica
description A regional study starting from detailed geological mapping has been carried out in the Malpica‐Tui Complex of Galicia in NW Spain. The complex is formed by two units representing pieces of the external edge of Gondwana, subducted and exhumed during the Variscan collision. The study shows that synsubduction and early synexhumation structures in continental subduction channels tends to be obscured and even erased once exhumation is complete. Detailed structural analysis, matched with the knowledge of the history, and available data for other Galician basal units have elucidated the major structures developed during the subduction‐exhumation process. The results include evidence of the plate convergence causing early Variscan continental subduction of the Gondwana margin. Subduction was followed by exhumation driven by ductile thrusting within the subduction channel, which, in turn, provoked crustal duplication in the subducted slab and modified the initial tectonometamorphic architecture of the subduction wedge. The next step was accretion to the adjacent continental domains, placing the subduction wedge on top of unsubducted parts of the Gondwana margin via ductile thrusting. Thrusting was preceded by progressive propagation of a train of recumbent folds toward the foreland that affected the previous structural stack. Subsequent transference of oceanic (Rheic) and peri‐Gondwanan terranes to the Gondwana margin took place by out‐of‐sequence thrusting followed by crustal extensional collapse and strike‐slip tectonics
publishDate 2011
dc.date.none.fl_str_mv 2011
2011-01-01
2011
2011-01-01
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 https://hdl.handle.net/20.500.14352/42446
url https://hdl.handle.net/20.500.14352/42446
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
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
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv European Geoscience Union
publisher.none.fl_str_mv European Geoscience Union
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300724

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