Age constraints on Lower Paleozoic convection system: Magmatic events in the NW Iberian Gondwana margin

The basal units of the allochthonous complexes of NW Iberia are used to examine the Lower Paleozoic geodynamic evolution of the northern Gondwana margin. These units represent the most external continental margin and the sequence of major magmatic events that affected them has been dated. Isotopic d...

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Detalhes bibliográficos
Autores: Díez Fernández, Rubén, Castiñeiras García, Pedro, Gómez Barreiro, Juan
Tipo de documento: artigo
Data de publicação:2012
País:España
Recursos:Universidad Complutense de Madrid (UCM)
Repositório:Docta Complutense
Idioma:inglês
OAI Identifier:oai:docta.ucm.es:20.500.14352/44009
Acesso em linha:https://hdl.handle.net/20.500.14352/44009
Access Level:Acceso aberto
Palavra-chave:552.3(460)
551.2(460)
Convection
Mantle dynamics
Plume
Gondwana
NW Iberia
Petrología
Geodinámica
2507 Geofísica
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spelling Age constraints on Lower Paleozoic convection system: Magmatic events in the NW Iberian Gondwana marginDíez Fernández, RubénCastiñeiras García, PedroGómez Barreiro, Juan552.3(460)551.2(460)ConvectionMantle dynamicsPlumeGondwanaNW IberiaPetrologíaGeodinámica2507 GeofísicaThe basal units of the allochthonous complexes of NW Iberia are used to examine the Lower Paleozoic geodynamic evolution of the northern Gondwana margin. These units represent the most external continental margin and the sequence of major magmatic events that affected them has been dated. Isotopic dating and field data highlight the existence of two magmatic pulses, dated at 489±4 Ma (granodiorites) and 474±3 Ma (alkali-granites), and a slightly younger alkaline/peralkaline pulse, dated at ca. 470–475 Ma (alkaline and peralkaline granites). Their framing into the regional background has allowed us to explore the major lithosphere-scale processes developed at the Gondwana periphery at that time, as well as to conceive a consistent model for the opening of the Rheic Ocean that reconciles the timing of sea opening and back-arc extension with the timing of intracontinental rifting. The sequence of events is framed in a Cambrian and Ordovician peri-Gondwanan subduction setting where we also explore how subduction may be linked to coeval intraplate magmatism far inboard of the arc–trench. This contribution discusses how such a scenario can be traced in basement areas through a modern analog perspective.Elsevier Science B. V., AmsterdamUniversidad Complutense de Madrid20122012-01-0120122012-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/44009reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/440092026-06-02T12:44:21Z
dc.title.none.fl_str_mv Age constraints on Lower Paleozoic convection system: Magmatic events in the NW Iberian Gondwana margin
title Age constraints on Lower Paleozoic convection system: Magmatic events in the NW Iberian Gondwana margin
spellingShingle Age constraints on Lower Paleozoic convection system: Magmatic events in the NW Iberian Gondwana margin
Díez Fernández, Rubén
552.3(460)
551.2(460)
Convection
Mantle dynamics
Plume
Gondwana
NW Iberia
Petrología
Geodinámica
2507 Geofísica
title_short Age constraints on Lower Paleozoic convection system: Magmatic events in the NW Iberian Gondwana margin
title_full Age constraints on Lower Paleozoic convection system: Magmatic events in the NW Iberian Gondwana margin
title_fullStr Age constraints on Lower Paleozoic convection system: Magmatic events in the NW Iberian Gondwana margin
title_full_unstemmed Age constraints on Lower Paleozoic convection system: Magmatic events in the NW Iberian Gondwana margin
title_sort Age constraints on Lower Paleozoic convection system: Magmatic events in the NW Iberian Gondwana margin
dc.creator.none.fl_str_mv Díez Fernández, Rubén
Castiñeiras García, Pedro
Gómez Barreiro, Juan
author Díez Fernández, Rubén
author_facet Díez Fernández, Rubén
Castiñeiras García, Pedro
Gómez Barreiro, Juan
author_role author
author2 Castiñeiras García, Pedro
Gómez Barreiro, Juan
author2_role author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 552.3(460)
551.2(460)
Convection
Mantle dynamics
Plume
Gondwana
NW Iberia
Petrología
Geodinámica
2507 Geofísica
topic 552.3(460)
551.2(460)
Convection
Mantle dynamics
Plume
Gondwana
NW Iberia
Petrología
Geodinámica
2507 Geofísica
description The basal units of the allochthonous complexes of NW Iberia are used to examine the Lower Paleozoic geodynamic evolution of the northern Gondwana margin. These units represent the most external continental margin and the sequence of major magmatic events that affected them has been dated. Isotopic dating and field data highlight the existence of two magmatic pulses, dated at 489±4 Ma (granodiorites) and 474±3 Ma (alkali-granites), and a slightly younger alkaline/peralkaline pulse, dated at ca. 470–475 Ma (alkaline and peralkaline granites). Their framing into the regional background has allowed us to explore the major lithosphere-scale processes developed at the Gondwana periphery at that time, as well as to conceive a consistent model for the opening of the Rheic Ocean that reconciles the timing of sea opening and back-arc extension with the timing of intracontinental rifting. The sequence of events is framed in a Cambrian and Ordovician peri-Gondwanan subduction setting where we also explore how subduction may be linked to coeval intraplate magmatism far inboard of the arc–trench. This contribution discusses how such a scenario can be traced in basement areas through a modern analog perspective.
publishDate 2012
dc.date.none.fl_str_mv 2012
2012-01-01
2012
2012-01-01
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/20.500.14352/44009
url https://hdl.handle.net/20.500.14352/44009
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 Science B. V., Amsterdam
publisher.none.fl_str_mv Elsevier Science B. V., Amsterdam
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 15,301629

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