Thickening and exhumation of the Variscan roots in the Iberian Central System: Tectonothermal processes and 40Ar/39Ar ages

40Ar/39Ar dating of white mica inmetapelites, thermobarometric calculations and new structural and geological mapping have been carried out in the Somosierra region (Iberian Central System, ICS) to investigate the Variscan thickening–exhumation processes and the evolution of the paleo-thermal struct...

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Detalles Bibliográficos
Autores: Rubio Pascual, Francisco J., Arenas Martín, Ricardo, Martínez Catalán, José Ramón, Rodríguez Fernández, Luis Roberto, Wijbrans, Jan R.
Tipo de recurso: artículo
Fecha de publicación:2013
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/44352
Acceso en línea:https://hdl.handle.net/20.500.14352/44352
Access Level:acceso abierto
Palabra clave:552.4(234.1)
Variscan metamorphism
Barrovian to low-P evolution
40Ar/39Ar geochronology
Iberian Massif
Petrología
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spelling Thickening and exhumation of the Variscan roots in the Iberian Central System: Tectonothermal processes and 40Ar/39Ar agesRubio Pascual, Francisco J.Arenas Martín, RicardoMartínez Catalán, José RamónRodríguez Fernández, Luis RobertoWijbrans, Jan R.552.4(234.1)Variscan metamorphismBarrovian to low-P evolution40Ar/39Ar geochronologyIberian MassifPetrología40Ar/39Ar dating of white mica inmetapelites, thermobarometric calculations and new structural and geological mapping have been carried out in the Somosierra region (Iberian Central System, ICS) to investigate the Variscan thickening–exhumation processes and the evolution of the paleo-thermal structure in a key region of the Central Iberian Zone. The rocks underwent an intermediate P/T event (M1) during a D1 stage of crustal thickening initiated between 354 and 347 Ma. This eventwas probably related to a first S to SE-directed emplacement of theNW Iberian allochthon, and during the initial development of amid-crustal subhorizontal shear zone accommodating the ductile flow of thermally weakened crust parallel to the main orogenic trend. Syn-convergent extension of the upper levels occurred by 335–327 Ma, when tectonic unroofing led to D2 domal uplift of the orogenic roots and to recrystallization of rocks under intermediate to low P/T conditions (M2). Individualized gneiss domes developed along the orogenic trend, whereas some post-M2 thrusts dated at c. 319 Ma reflect lateral flow related to limited gravitational spreading of the domes. Younger upright to SW verging folding of the ICS dome during D3 progressive renewal of contractive deformation took place after 316 Ma. Final D4 gravitational collapse occurred under low P/T conditions (M3) at c. 300 Ma, accompanied by the intrusion of large volumes of anatectic granitoids.ElsevierUniversidad Complutense de Madrid20132013-01-0120132013-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/44352reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/443522026-06-02T12:44:21Z
dc.title.none.fl_str_mv Thickening and exhumation of the Variscan roots in the Iberian Central System: Tectonothermal processes and 40Ar/39Ar ages
title Thickening and exhumation of the Variscan roots in the Iberian Central System: Tectonothermal processes and 40Ar/39Ar ages
spellingShingle Thickening and exhumation of the Variscan roots in the Iberian Central System: Tectonothermal processes and 40Ar/39Ar ages
Rubio Pascual, Francisco J.
552.4(234.1)
Variscan metamorphism
Barrovian to low-P evolution
40Ar/39Ar geochronology
Iberian Massif
Petrología
title_short Thickening and exhumation of the Variscan roots in the Iberian Central System: Tectonothermal processes and 40Ar/39Ar ages
title_full Thickening and exhumation of the Variscan roots in the Iberian Central System: Tectonothermal processes and 40Ar/39Ar ages
title_fullStr Thickening and exhumation of the Variscan roots in the Iberian Central System: Tectonothermal processes and 40Ar/39Ar ages
title_full_unstemmed Thickening and exhumation of the Variscan roots in the Iberian Central System: Tectonothermal processes and 40Ar/39Ar ages
title_sort Thickening and exhumation of the Variscan roots in the Iberian Central System: Tectonothermal processes and 40Ar/39Ar ages
dc.creator.none.fl_str_mv Rubio Pascual, Francisco J.
Arenas Martín, Ricardo
Martínez Catalán, José Ramón
Rodríguez Fernández, Luis Roberto
Wijbrans, Jan R.
author Rubio Pascual, Francisco J.
author_facet Rubio Pascual, Francisco J.
Arenas Martín, Ricardo
Martínez Catalán, José Ramón
Rodríguez Fernández, Luis Roberto
Wijbrans, Jan R.
author_role author
author2 Arenas Martín, Ricardo
Martínez Catalán, José Ramón
Rodríguez Fernández, Luis Roberto
Wijbrans, Jan R.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 552.4(234.1)
Variscan metamorphism
Barrovian to low-P evolution
40Ar/39Ar geochronology
Iberian Massif
Petrología
topic 552.4(234.1)
Variscan metamorphism
Barrovian to low-P evolution
40Ar/39Ar geochronology
Iberian Massif
Petrología
description 40Ar/39Ar dating of white mica inmetapelites, thermobarometric calculations and new structural and geological mapping have been carried out in the Somosierra region (Iberian Central System, ICS) to investigate the Variscan thickening–exhumation processes and the evolution of the paleo-thermal structure in a key region of the Central Iberian Zone. The rocks underwent an intermediate P/T event (M1) during a D1 stage of crustal thickening initiated between 354 and 347 Ma. This eventwas probably related to a first S to SE-directed emplacement of theNW Iberian allochthon, and during the initial development of amid-crustal subhorizontal shear zone accommodating the ductile flow of thermally weakened crust parallel to the main orogenic trend. Syn-convergent extension of the upper levels occurred by 335–327 Ma, when tectonic unroofing led to D2 domal uplift of the orogenic roots and to recrystallization of rocks under intermediate to low P/T conditions (M2). Individualized gneiss domes developed along the orogenic trend, whereas some post-M2 thrusts dated at c. 319 Ma reflect lateral flow related to limited gravitational spreading of the domes. Younger upright to SW verging folding of the ICS dome during D3 progressive renewal of contractive deformation took place after 316 Ma. Final D4 gravitational collapse occurred under low P/T conditions (M3) at c. 300 Ma, accompanied by the intrusion of large volumes of anatectic granitoids.
publishDate 2013
dc.date.none.fl_str_mv 2013
2013-01-01
2013
2013-01-01
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/20.500.14352/44352
url https://hdl.handle.net/20.500.14352/44352
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 Elsevier
publisher.none.fl_str_mv Elsevier
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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