Re-folded structure of syn-orogenic granitoids (Padrón dome, NW Iberia): Assessing rheological evolution of cooling continental crust in a collisional setting

[EN] This contribution discusses about the rheological, kinematic and dynamic frameworks necessary to produce recumbent and upright folds from syn-orogenic granitic massifs that were formed during an early stage of magma genesis related to the onset of a migmatitic dome. Syn-kinematic granitoids occ...

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Autores: Díez Fernández, Rubén, Rubio Pascual, Francisco Javier, Martín Parra, L.M.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2019
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/341247
Acceso en línea:http://hdl.handle.net/10261/341247
Access Level:acceso abierto
Palabra clave:Recumbent folds
Migmatitic domes
Partial melting
Crustal-derived granitoids
Orogenic collapse
Variscan orogen
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spelling Re-folded structure of syn-orogenic granitoids (Padrón dome, NW Iberia): Assessing rheological evolution of cooling continental crust in a collisional settingDíez Fernández, RubénRubio Pascual, Francisco JavierMartín Parra, L.M.Recumbent foldsMigmatitic domesPartial meltingCrustal-derived granitoidsOrogenic collapseVariscan orogen[EN] This contribution discusses about the rheological, kinematic and dynamic frameworks necessary to produce recumbent and upright folds from syn-orogenic granitic massifs that were formed during an early stage of magma genesis related to the onset of a migmatitic dome. Syn-kinematic granitoids occurring within the high-grade infrastructure of the Padrón migmatitic dome (NW Iberia) are deformed into large-scale recumbent folds (D2) that are later affected by upright folds (D3). Petrostructural analysis of a selected area of this dome reveals that after a period of crustal thickening (D1), NNW-directed extensional flow gave way to recumbent folds and penetrative axial plane foliation (S2). Superimposed subhorizontal compression resulted in upright folds (D3). A closer view into the dynamics of the dome allows exploring the factors that may condition the nucleation of folds with contrasting geometries during progressive deformation of molten continental crust. The formation of folds affecting syn-kinematic granitoids suggests a cooling metamorphic path in migmatitic domes. Active and passive folding mechanisms require a crystallizing (cooling) magma to nucleate folds. A more competent metamorphic host inhibits fold nucleation from much less competent magmas. As it crystallizes, magma becomes more rigid (competent), and approaches viscosity values of its host. Passive folding is favored when no significant competence contrast exists between magma and host, so this folding mechanism is more likely shortly after magma genesis and emplacement. In such conditions, and under dominant subhorizontal flow accompanied by flattening (D2), passive folding would produce isoclinal recumbent geometries. Further magma cooling introduces a shift into the rheological behavior of partially molten crust. Thereon, crystallizing magma bodies would represent significant competence contrasts relative to their host. At this point, buckling is a more likely folding mechanism, and more regular, buckle folds re-fold previous structures after significant cooling. The geometry of resulting folds is upright due to dominant subhorizontal compression (D3) at this stage.Financial support has been provided by Instituto Geológico y Minero de España (Project IGME 2281), and by Ministerio de Economía, Industria y Competitividad of Spain (Project No. CGL2016-76438-P).Peer reviewedElsevierCSIC - Instituto Geológico y Minero de España (IGME)Ministerio de Economía, Industria y Competitividad (España)Díez Fernández, Rubén [0000-0002-0379-7970]Rubio Pascual, Francisco Javier [0000-0001-6154-6590]Martín Parra, L.M. [0000-0003-2816-5299]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202320232019info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/341247reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO//CGL2016-76438-Phttps://doi.org/10.1016/j.gsf.2018.03.007Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3412472026-05-22T06:33:51Z
dc.title.none.fl_str_mv Re-folded structure of syn-orogenic granitoids (Padrón dome, NW Iberia): Assessing rheological evolution of cooling continental crust in a collisional setting
title Re-folded structure of syn-orogenic granitoids (Padrón dome, NW Iberia): Assessing rheological evolution of cooling continental crust in a collisional setting
spellingShingle Re-folded structure of syn-orogenic granitoids (Padrón dome, NW Iberia): Assessing rheological evolution of cooling continental crust in a collisional setting
Díez Fernández, Rubén
Recumbent folds
Migmatitic domes
Partial melting
Crustal-derived granitoids
Orogenic collapse
Variscan orogen
title_short Re-folded structure of syn-orogenic granitoids (Padrón dome, NW Iberia): Assessing rheological evolution of cooling continental crust in a collisional setting
title_full Re-folded structure of syn-orogenic granitoids (Padrón dome, NW Iberia): Assessing rheological evolution of cooling continental crust in a collisional setting
title_fullStr Re-folded structure of syn-orogenic granitoids (Padrón dome, NW Iberia): Assessing rheological evolution of cooling continental crust in a collisional setting
title_full_unstemmed Re-folded structure of syn-orogenic granitoids (Padrón dome, NW Iberia): Assessing rheological evolution of cooling continental crust in a collisional setting
title_sort Re-folded structure of syn-orogenic granitoids (Padrón dome, NW Iberia): Assessing rheological evolution of cooling continental crust in a collisional setting
dc.creator.none.fl_str_mv Díez Fernández, Rubén
Rubio Pascual, Francisco Javier
Martín Parra, L.M.
author Díez Fernández, Rubén
author_facet Díez Fernández, Rubén
Rubio Pascual, Francisco Javier
Martín Parra, L.M.
author_role author
author2 Rubio Pascual, Francisco Javier
Martín Parra, L.M.
author2_role author
author
dc.contributor.none.fl_str_mv CSIC - Instituto Geológico y Minero de España (IGME)
Ministerio de Economía, Industria y Competitividad (España)
Díez Fernández, Rubén [0000-0002-0379-7970]
Rubio Pascual, Francisco Javier [0000-0001-6154-6590]
Martín Parra, L.M. [0000-0003-2816-5299]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Recumbent folds
Migmatitic domes
Partial melting
Crustal-derived granitoids
Orogenic collapse
Variscan orogen
topic Recumbent folds
Migmatitic domes
Partial melting
Crustal-derived granitoids
Orogenic collapse
Variscan orogen
description [EN] This contribution discusses about the rheological, kinematic and dynamic frameworks necessary to produce recumbent and upright folds from syn-orogenic granitic massifs that were formed during an early stage of magma genesis related to the onset of a migmatitic dome. Syn-kinematic granitoids occurring within the high-grade infrastructure of the Padrón migmatitic dome (NW Iberia) are deformed into large-scale recumbent folds (D2) that are later affected by upright folds (D3). Petrostructural analysis of a selected area of this dome reveals that after a period of crustal thickening (D1), NNW-directed extensional flow gave way to recumbent folds and penetrative axial plane foliation (S2). Superimposed subhorizontal compression resulted in upright folds (D3). A closer view into the dynamics of the dome allows exploring the factors that may condition the nucleation of folds with contrasting geometries during progressive deformation of molten continental crust. The formation of folds affecting syn-kinematic granitoids suggests a cooling metamorphic path in migmatitic domes. Active and passive folding mechanisms require a crystallizing (cooling) magma to nucleate folds. A more competent metamorphic host inhibits fold nucleation from much less competent magmas. As it crystallizes, magma becomes more rigid (competent), and approaches viscosity values of its host. Passive folding is favored when no significant competence contrast exists between magma and host, so this folding mechanism is more likely shortly after magma genesis and emplacement. In such conditions, and under dominant subhorizontal flow accompanied by flattening (D2), passive folding would produce isoclinal recumbent geometries. Further magma cooling introduces a shift into the rheological behavior of partially molten crust. Thereon, crystallizing magma bodies would represent significant competence contrasts relative to their host. At this point, buckling is a more likely folding mechanism, and more regular, buckle folds re-fold previous structures after significant cooling. The geometry of resulting folds is upright due to dominant subhorizontal compression (D3) at this stage.
publishDate 2019
dc.date.none.fl_str_mv 2019
2023
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/341247
url http://hdl.handle.net/10261/341247
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MINECO//CGL2016-76438-P
https://doi.org/10.1016/j.gsf.2018.03.007
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
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repository.mail.fl_str_mv
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