Variscan exhumation of a subducted Paleozoic continental margin: The basal units of the Ordenes Complex, Galicia, NW Spain

A structural and metamorphic study was carried out in the basal units of the Ordenes Complex in Spain, thought to represent a subducted part of the Paleozoic margin of Gondwana. According to their metamorphic evolution, this part of the margin was subducted at the onset of the Variscan Orogeny, beco...

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Autores: Martínez Catalán, José Ramón, Arenas Martín, Ricardo, Díaz García, Florentino, Rubio Pascual, Francisco J., Abati Gómez, Jacobo, Marquínez, Jorge
Tipo de recurso: artículo
Fecha de publicación:1996
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/58114
Acceso en línea:https://hdl.handle.net/20.500.14352/58114
Access Level:acceso abierto
Palabra clave:551.25
Varisman
Paleozoic
Continental margin
Galicia
Geodinámica
2507 Geofísica
id ES_3fe97b673e3ea53e87ffdc5b84ee1421
oai_identifier_str oai:docta.ucm.es:20.500.14352/58114
network_acronym_str ES
network_name_str España
spelling Variscan exhumation of a subducted Paleozoic continental margin: The basal units of the Ordenes Complex, Galicia, NW Spain Martínez Catalán, José Ramón Arenas Martín, Ricardo Díaz García, Florentino Rubio Pascual, Francisco J. Abati Gómez, Jacobo Marquínez, Jorge 551.25 Varisman Paleozoic Continental margin Galicia Geodinámica 2507 Geofísica A structural and metamorphic study was carried out in the basal units of the Ordenes Complex in Spain, thought to represent a subducted part of the Paleozoic margin of Gondwana. According to their metamorphic evolution, this part of the margin was subducted at the onset of the Variscan Orogeny, becoming part of an accretionary complex developed below a colliding element built previously. Variations in the PT conditions of the first high-pressure metamorphic event along the units indicate a polarity of the subduction to the west. Subsequent underthrusting of more continental material blocked the subduction and triggered the ascent and exhumation of the basal units, whereas the convergence continued. Recumbent folds and thrusts de ve loped along with successive normal detachments. Compressional and extensional structures were synchronous or alternated in time and together induced the thinning and tapering of the orogenic wedge and its lateral spreading. The unroofing took place locally under an inverted temperature gradient caused by a detachment which carried a part of the hot mantle wedge above the subduction zone over the subducted units. American Geophysical Union https://hdl.handle.net/20.500.14352/58114
title Variscan exhumation of a subducted Paleozoic continental margin: The basal units of the Ordenes Complex, Galicia, NW Spain
spellingShingle Variscan exhumation of a subducted Paleozoic continental margin: The basal units of the Ordenes Complex, Galicia, NW Spain
Martínez Catalán, José Ramón
551.25
Varisman
Paleozoic
Continental margin
Galicia
Geodinámica
2507 Geofísica
title_short Variscan exhumation of a subducted Paleozoic continental margin: The basal units of the Ordenes Complex, Galicia, NW Spain
title_full Variscan exhumation of a subducted Paleozoic continental margin: The basal units of the Ordenes Complex, Galicia, NW Spain
title_fullStr Variscan exhumation of a subducted Paleozoic continental margin: The basal units of the Ordenes Complex, Galicia, NW Spain
title_full_unstemmed Variscan exhumation of a subducted Paleozoic continental margin: The basal units of the Ordenes Complex, Galicia, NW Spain
title_sort Variscan exhumation of a subducted Paleozoic continental margin: The basal units of the Ordenes Complex, Galicia, NW Spain
author Martínez Catalán, José Ramón
author_facet Martínez Catalán, José Ramón
Arenas Martín, Ricardo
Díaz García, Florentino
Rubio Pascual, Francisco J.
Abati Gómez, Jacobo
Marquínez, Jorge
author_role author
author2 Arenas Martín, Ricardo
Díaz García, Florentino
Rubio Pascual, Francisco J.
Abati Gómez, Jacobo
Marquínez, Jorge
author2_role author
author
author
author
author
topic 551.25
Varisman
Paleozoic
Continental margin
Galicia
Geodinámica
2507 Geofísica
topic_facet 551.25
Varisman
Paleozoic
Continental margin
Galicia
Geodinámica
2507 Geofísica
description A structural and metamorphic study was carried out in the basal units of the Ordenes Complex in Spain, thought to represent a subducted part of the Paleozoic margin of Gondwana. According to their metamorphic evolution, this part of the margin was subducted at the onset of the Variscan Orogeny, becoming part of an accretionary complex developed below a colliding element built previously. Variations in the PT conditions of the first high-pressure metamorphic event along the units indicate a polarity of the subduction to the west. Subsequent underthrusting of more continental material blocked the subduction and triggered the ascent and exhumation of the basal units, whereas the convergence continued. Recumbent folds and thrusts de ve loped along with successive normal detachments. Compressional and extensional structures were synchronous or alternated in time and together induced the thinning and tapering of the orogenic wedge and its lateral spreading. The unroofing took place locally under an inverted temperature gradient caused by a detachment which carried a part of the hot mantle wedge above the subduction zone over the subducted units.
publishDate 1996
format article
url https://hdl.handle.net/20.500.14352/58114
language eng
eu_rights_str_mv openAccess
publisher American Geophysical Union
institution Universidad Complutense de Madrid (UCM)
collection Docta Complutense
reponame_str Docta Complutense
instname_str Universidad Complutense de Madrid (UCM)
_version_ 1878433775290941440
publishDateSort 1996
author_browse Abati Gómez, Jacobo
Arenas Martín, Ricardo
Díaz García, Florentino
Marquínez, Jorge
Martínez Catalán, José Ramón
Rubio Pascual, Francisco J.
publisherStr American Geophysical Union
score 6,924472

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