Recycled metaigneous crustal sources for S- and I-type Variscan granitoids from the Spanish Central System batholith: Constraints from Hf isotope zircon composition

The Spanish Central System (SCS) is one of the largest granite batholiths in the European Variscan Belt. Zircons from five granitic intrusions from the eastern SCS have been separated and analysed for Hf isotopes by laser ablation MC-ICPMS, in order to evaluate the nature of granitic magma source. T...

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Authors: Villaseca González, Carlos, Orejana García, David, Belousova, Elena
Format: article
Publication Date:2012
Country:España
Institution:Universidad Complutense de Madrid (UCM)
Repository:Docta Complutense
Language:English
OAI Identifier:oai:docta.ucm.es:20.500.14352/43925
Online Access:https://hdl.handle.net/20.500.14352/43925
Access Level:Open access
Keyword:552.3(234.1)
U–Pb dating
Zircon Hf-isotope composition
Peraluminous granites
Spanish Central System
Variscan Iberian Belt
Petrología
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spelling Recycled metaigneous crustal sources for S- and I-type Variscan granitoids from the Spanish Central System batholith: Constraints from Hf isotope zircon compositionVillaseca González, CarlosOrejana García, DavidBelousova, Elena552.3(234.1)U–Pb datingZircon Hf-isotope compositionPeraluminous granitesSpanish Central SystemVariscan Iberian BeltPetrologíaThe Spanish Central System (SCS) is one of the largest granite batholiths in the European Variscan Belt. Zircons from five granitic intrusions from the eastern SCS have been separated and analysed for Hf isotopes by laser ablation MC-ICPMS, in order to evaluate the nature of granitic magma source. Two samples are cordierite-bearing S-type granites, the rest are amphibole-bearing I-type monzogranites. Hf-isotope composition of zircons from these granites defines a narrow range of negative ɛHf values (−1.1 to −5.8), typical of crustal protoliths. The within-sample variation of zircon Hf isotope composition is slightly above the analytical uncertainty (±1.5 ɛ units), suggesting the mixing of different magma batches during pluton assembly. The S- and I-type granites display the same range of initial ɛHf values, that is in agreement with previous data showing that both SCS granite types have similar (Sr, Nd, O, Pb) isotope signatures. These isotopic data suggest that they derived from similar sources, while the variation in peraluminosity could be related to different partial melting conditions. The presence of a Lower Ordovician inherited zircon population (478–462 Ma), at least in I-type granites, suggests the involvement of Cambro–Ordovician orthogneisses as components in the source of some SCS granites. Inherited zircon population of similar age has also been identified in the SCS lower crustal granulites. The Hf-isotope composition of the analysed granite zircons is within that of zircons from the above granulites. Moreover, some evidence of a juvenile input at 560–595 Ma is recorded by Hf-isotope data in zircons from both the SCS granites and granulite xenoliths. Hf-isotope signature, in conjunction with other chemical, isotopic (Sr, Nd, O, Pb) and geochronological evidences, suggests that SCS granites were probably derived from metaigneous lower crustal sources. The Variscan magmatism in central Spain is dominantly a crustal reworking event.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/20.500.14352/43925reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/439252026-06-02T12:44:21Z
dc.title.none.fl_str_mv Recycled metaigneous crustal sources for S- and I-type Variscan granitoids from the Spanish Central System batholith: Constraints from Hf isotope zircon composition
title Recycled metaigneous crustal sources for S- and I-type Variscan granitoids from the Spanish Central System batholith: Constraints from Hf isotope zircon composition
spellingShingle Recycled metaigneous crustal sources for S- and I-type Variscan granitoids from the Spanish Central System batholith: Constraints from Hf isotope zircon composition
Villaseca González, Carlos
552.3(234.1)
U–Pb dating
Zircon Hf-isotope composition
Peraluminous granites
Spanish Central System
Variscan Iberian Belt
Petrología
title_short Recycled metaigneous crustal sources for S- and I-type Variscan granitoids from the Spanish Central System batholith: Constraints from Hf isotope zircon composition
title_full Recycled metaigneous crustal sources for S- and I-type Variscan granitoids from the Spanish Central System batholith: Constraints from Hf isotope zircon composition
title_fullStr Recycled metaigneous crustal sources for S- and I-type Variscan granitoids from the Spanish Central System batholith: Constraints from Hf isotope zircon composition
title_full_unstemmed Recycled metaigneous crustal sources for S- and I-type Variscan granitoids from the Spanish Central System batholith: Constraints from Hf isotope zircon composition
title_sort Recycled metaigneous crustal sources for S- and I-type Variscan granitoids from the Spanish Central System batholith: Constraints from Hf isotope zircon composition
dc.creator.none.fl_str_mv Villaseca González, Carlos
Orejana García, David
Belousova, Elena
author Villaseca González, Carlos
author_facet Villaseca González, Carlos
Orejana García, David
Belousova, Elena
author_role author
author2 Orejana García, David
Belousova, Elena
author2_role author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 552.3(234.1)
U–Pb dating
Zircon Hf-isotope composition
Peraluminous granites
Spanish Central System
Variscan Iberian Belt
Petrología
topic 552.3(234.1)
U–Pb dating
Zircon Hf-isotope composition
Peraluminous granites
Spanish Central System
Variscan Iberian Belt
Petrología
description The Spanish Central System (SCS) is one of the largest granite batholiths in the European Variscan Belt. Zircons from five granitic intrusions from the eastern SCS have been separated and analysed for Hf isotopes by laser ablation MC-ICPMS, in order to evaluate the nature of granitic magma source. Two samples are cordierite-bearing S-type granites, the rest are amphibole-bearing I-type monzogranites. Hf-isotope composition of zircons from these granites defines a narrow range of negative ɛHf values (−1.1 to −5.8), typical of crustal protoliths. The within-sample variation of zircon Hf isotope composition is slightly above the analytical uncertainty (±1.5 ɛ units), suggesting the mixing of different magma batches during pluton assembly. The S- and I-type granites display the same range of initial ɛHf values, that is in agreement with previous data showing that both SCS granite types have similar (Sr, Nd, O, Pb) isotope signatures. These isotopic data suggest that they derived from similar sources, while the variation in peraluminosity could be related to different partial melting conditions. The presence of a Lower Ordovician inherited zircon population (478–462 Ma), at least in I-type granites, suggests the involvement of Cambro–Ordovician orthogneisses as components in the source of some SCS granites. Inherited zircon population of similar age has also been identified in the SCS lower crustal granulites. The Hf-isotope composition of the analysed granite zircons is within that of zircons from the above granulites. Moreover, some evidence of a juvenile input at 560–595 Ma is recorded by Hf-isotope data in zircons from both the SCS granites and granulite xenoliths. Hf-isotope signature, in conjunction with other chemical, isotopic (Sr, Nd, O, Pb) and geochronological evidences, suggests that SCS granites were probably derived from metaigneous lower crustal sources. The Variscan magmatism in central Spain is dominantly a crustal reworking event.
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/20.500.14352/43925
url https://hdl.handle.net/20.500.14352/43925
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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