The Variscan gabbros from the Spanish Central System: A case for crustal recycling in the sub-continental lithospheric mantle?

The gabbroic intrusions that crop out along the Spanish Central System (SCS) are geochemically heterogeneous, including primitive and evolved rocks. Differentiation is mainly related to fractionation of Cr-spinel and olivine, but mixing with coeval granitic magmas or crustal assimilation may have al...

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Detalles Bibliográficos
Autores: Orejana García, David, Villaseca González, Carlos, Pérez-Soba Aguilar, Cecilia María, López García, José Ángel, Billstrom, Kjell
Tipo de recurso: artículo
Fecha de publicación:2009
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/49588
Acceso en línea:https://hdl.handle.net/20.500.14352/49588
Access Level:acceso abierto
Palabra clave:552.4(234.1)
Gabbroic rocks
Crustal recycling
Variscan orogeny
Lithospheric mantle
Spanish Central System
Petrología
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spelling The Variscan gabbros from the Spanish Central System: A case for crustal recycling in the sub-continental lithospheric mantle?Orejana García, DavidVillaseca González, CarlosPérez-Soba Aguilar, Cecilia MaríaLópez García, José ÁngelBillstrom, Kjell552.4(234.1)Gabbroic rocksCrustal recyclingVariscan orogenyLithospheric mantleSpanish Central SystemPetrologíaThe gabbroic intrusions that crop out along the Spanish Central System (SCS) are geochemically heterogeneous, including primitive and evolved rocks. Differentiation is mainly related to fractionation of Cr-spinel and olivine, but mixing with coeval granitic magmas or crustal assimilation may have also played a role in the evolution of the most differentiated rocks. The most primitive uncontaminated gabbros show arclike trace element chondrite and primitive-mantle normalised patterns, characterised by large ion lithophile elements (LILE)-light rare earth elements (LREE) enrichment, Sr and Pb positive and Nb–Ta–Ti negative anomalies. However, paleogeographic constraints suggest that the SCS was located far from subduction zones, so these geochemical signatures could be better explained by a recycling of continental crustal components within the mantle. The most primitive SCS gabbros expand the Sr–Nd isotopic compositional range of the Variscan basic magmatism in the Central Iberian Zone to more depleted values. This reflects a heterogeneous sub-continental lithospheric mantle under central Spain ranging from a depleted mantle (εNd=+3.1, 87Sr/86Sr=0.704) towards an isotopically enriched component (εNd=−1.6, 87Sr/ 86Sr=0.706). Geochemical modelling suggests that mantle enrichment could be explained by minor lower crustal metapelitic granulite contamination (~2%). Additionally, the Sr–Nd–Pb isotopic ratios of the most primitive gabbros match the composition of the European subcontinental lithospheric mantle recorded in ultramafic xenoliths from western and central Europe.Elsevier Science B.V., AmsterdamUniversidad Complutense de Madrid20092009-01-0120092009-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/49588reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/495882026-06-02T12:44:21Z
dc.title.none.fl_str_mv The Variscan gabbros from the Spanish Central System: A case for crustal recycling in the sub-continental lithospheric mantle?
title The Variscan gabbros from the Spanish Central System: A case for crustal recycling in the sub-continental lithospheric mantle?
spellingShingle The Variscan gabbros from the Spanish Central System: A case for crustal recycling in the sub-continental lithospheric mantle?
Orejana García, David
552.4(234.1)
Gabbroic rocks
Crustal recycling
Variscan orogeny
Lithospheric mantle
Spanish Central System
Petrología
title_short The Variscan gabbros from the Spanish Central System: A case for crustal recycling in the sub-continental lithospheric mantle?
title_full The Variscan gabbros from the Spanish Central System: A case for crustal recycling in the sub-continental lithospheric mantle?
title_fullStr The Variscan gabbros from the Spanish Central System: A case for crustal recycling in the sub-continental lithospheric mantle?
title_full_unstemmed The Variscan gabbros from the Spanish Central System: A case for crustal recycling in the sub-continental lithospheric mantle?
title_sort The Variscan gabbros from the Spanish Central System: A case for crustal recycling in the sub-continental lithospheric mantle?
dc.creator.none.fl_str_mv Orejana García, David
Villaseca González, Carlos
Pérez-Soba Aguilar, Cecilia María
López García, José Ángel
Billstrom, Kjell
author Orejana García, David
author_facet Orejana García, David
Villaseca González, Carlos
Pérez-Soba Aguilar, Cecilia María
López García, José Ángel
Billstrom, Kjell
author_role author
author2 Villaseca González, Carlos
Pérez-Soba Aguilar, Cecilia María
López García, José Ángel
Billstrom, Kjell
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)
Gabbroic rocks
Crustal recycling
Variscan orogeny
Lithospheric mantle
Spanish Central System
Petrología
topic 552.4(234.1)
Gabbroic rocks
Crustal recycling
Variscan orogeny
Lithospheric mantle
Spanish Central System
Petrología
description The gabbroic intrusions that crop out along the Spanish Central System (SCS) are geochemically heterogeneous, including primitive and evolved rocks. Differentiation is mainly related to fractionation of Cr-spinel and olivine, but mixing with coeval granitic magmas or crustal assimilation may have also played a role in the evolution of the most differentiated rocks. The most primitive uncontaminated gabbros show arclike trace element chondrite and primitive-mantle normalised patterns, characterised by large ion lithophile elements (LILE)-light rare earth elements (LREE) enrichment, Sr and Pb positive and Nb–Ta–Ti negative anomalies. However, paleogeographic constraints suggest that the SCS was located far from subduction zones, so these geochemical signatures could be better explained by a recycling of continental crustal components within the mantle. The most primitive SCS gabbros expand the Sr–Nd isotopic compositional range of the Variscan basic magmatism in the Central Iberian Zone to more depleted values. This reflects a heterogeneous sub-continental lithospheric mantle under central Spain ranging from a depleted mantle (εNd=+3.1, 87Sr/86Sr=0.704) towards an isotopically enriched component (εNd=−1.6, 87Sr/ 86Sr=0.706). Geochemical modelling suggests that mantle enrichment could be explained by minor lower crustal metapelitic granulite contamination (~2%). Additionally, the Sr–Nd–Pb isotopic ratios of the most primitive gabbros match the composition of the European subcontinental lithospheric mantle recorded in ultramafic xenoliths from western and central Europe.
publishDate 2009
dc.date.none.fl_str_mv 2009
2009-01-01
2009
2009-01-01
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/20.500.14352/49588
url https://hdl.handle.net/20.500.14352/49588
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 15.300724

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