The enriched Variscan lithosphere of NE Iberia

Post-collisional mafic dykes crosscut the Paleozoic metamorphic basement and late-Variscan plutons in Les Guilleries massif (Catalan Coastal Ranges, NE Iberia). The predominance of mafic phenocrysts, porphyritic texture, abundant amphibole, high MgO and volatile content, together with crustal-like t...

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Autores: Mellado, Esteban|||0000-0002-4818-3534, Corbella, Mercè|||0000-0002-8622-2442, Navarro-Ciurana, Dídac|||0000-0001-7457-3387, Kylander-Clark, Andrew|||0000-0002-4034-644X
Formato: artículo
Fecha de publicación:2021
País:España
Recursos:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:250165
Acesso em linha:https://ddd.uab.cat/record/250165
https://dx.doi.org/urn:doi:10.1344/GeologicaActa2021.19.15
Access Level:acceso abierto
Palavra-chave:Calc-alkaline lamprophyre
Post-collisional dykes
Sr-Nd isotopes
Les Guilleries Massif
Catalan Coastal Ranges
Variscan Orogeny
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spelling The enriched Variscan lithosphere of NE Iberiadata from postcollisional Permian calc-alkaline lamprophyre dykes of Les GuilleriesMellado, Esteban|||0000-0002-4818-3534Corbella, Mercè|||0000-0002-8622-2442Navarro-Ciurana, Dídac|||0000-0001-7457-3387Kylander-Clark, Andrew|||0000-0002-4034-644XCalc-alkaline lamprophyrePost-collisional dykesSr-Nd isotopesLes Guilleries MassifCatalan Coastal RangesVariscan OrogenyPost-collisional mafic dykes crosscut the Paleozoic metamorphic basement and late-Variscan plutons in Les Guilleries massif (Catalan Coastal Ranges, NE Iberia). The predominance of mafic phenocrysts, porphyritic texture, abundant amphibole, high MgO and volatile content, together with crustal-like trace-element patterns indicate that the dykes correspond to calc-alkaline lamprophyres, mainly spessartites. Their enrichment in LILE, HFSE and REE and initial Sr-Nd isotopic compositions (87Sr/86Sri between 0.70851 and 0.71127, epsilon Ndi between -5.23 and -4.63) are consistent with an enriched subcontinental lithospheric mantle source. U-Pb ages of matrix titanite crystals yield concordia ages of 262±7Ma, congruent with crosscutting relationships. Postmagmatic processes are evidenced by intense chloritization and albitization of the lamprophyres, together with systematic variations of Na2O vs SiO2, K2O, CaO, Ba, Rb, Cs, Pb, Sr, Tl, and Zn, and possibly the removal of F. The geochemical and geochronological data support an orogenic geochemical affinity, in accordance with the transitional tectonic regime between Variscan compression/transpression and post-collisional transtension/extension, related to the fragmentation of Pangea and thinning of the lithosphere. The lamprophyre dykes studied could represent the youngest pulse of Variscan orogenic magmatism and, therefore, mark its end in NE Iberia before the onset of the generalized Triassic extension. 22021-01-0120212021-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/250165https://dx.doi.org/urn:doi:10.1344/GeologicaActa2021.19.15reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengMinisterio de Economía y Competitividad https://doi.org/10.13039/501100003329 CGL-2015-66335-C2-2-Ropen accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria.https://creativecommons.org/licenses/by-sa/4.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:2501652026-06-06T12:50:31Z
dc.title.none.fl_str_mv The enriched Variscan lithosphere of NE Iberia
data from postcollisional Permian calc-alkaline lamprophyre dykes of Les Guilleries
title The enriched Variscan lithosphere of NE Iberia
spellingShingle The enriched Variscan lithosphere of NE Iberia
Mellado, Esteban|||0000-0002-4818-3534
Calc-alkaline lamprophyre
Post-collisional dykes
Sr-Nd isotopes
Les Guilleries Massif
Catalan Coastal Ranges
Variscan Orogeny
title_short The enriched Variscan lithosphere of NE Iberia
title_full The enriched Variscan lithosphere of NE Iberia
title_fullStr The enriched Variscan lithosphere of NE Iberia
title_full_unstemmed The enriched Variscan lithosphere of NE Iberia
title_sort The enriched Variscan lithosphere of NE Iberia
dc.creator.none.fl_str_mv Mellado, Esteban|||0000-0002-4818-3534
Corbella, Mercè|||0000-0002-8622-2442
Navarro-Ciurana, Dídac|||0000-0001-7457-3387
Kylander-Clark, Andrew|||0000-0002-4034-644X
author Mellado, Esteban|||0000-0002-4818-3534
author_facet Mellado, Esteban|||0000-0002-4818-3534
Corbella, Mercè|||0000-0002-8622-2442
Navarro-Ciurana, Dídac|||0000-0001-7457-3387
Kylander-Clark, Andrew|||0000-0002-4034-644X
author_role author
author2 Corbella, Mercè|||0000-0002-8622-2442
Navarro-Ciurana, Dídac|||0000-0001-7457-3387
Kylander-Clark, Andrew|||0000-0002-4034-644X
author2_role author
author
author
dc.subject.none.fl_str_mv Calc-alkaline lamprophyre
Post-collisional dykes
Sr-Nd isotopes
Les Guilleries Massif
Catalan Coastal Ranges
Variscan Orogeny
topic Calc-alkaline lamprophyre
Post-collisional dykes
Sr-Nd isotopes
Les Guilleries Massif
Catalan Coastal Ranges
Variscan Orogeny
description Post-collisional mafic dykes crosscut the Paleozoic metamorphic basement and late-Variscan plutons in Les Guilleries massif (Catalan Coastal Ranges, NE Iberia). The predominance of mafic phenocrysts, porphyritic texture, abundant amphibole, high MgO and volatile content, together with crustal-like trace-element patterns indicate that the dykes correspond to calc-alkaline lamprophyres, mainly spessartites. Their enrichment in LILE, HFSE and REE and initial Sr-Nd isotopic compositions (87Sr/86Sri between 0.70851 and 0.71127, epsilon Ndi between -5.23 and -4.63) are consistent with an enriched subcontinental lithospheric mantle source. U-Pb ages of matrix titanite crystals yield concordia ages of 262±7Ma, congruent with crosscutting relationships. Postmagmatic processes are evidenced by intense chloritization and albitization of the lamprophyres, together with systematic variations of Na2O vs SiO2, K2O, CaO, Ba, Rb, Cs, Pb, Sr, Tl, and Zn, and possibly the removal of F. The geochemical and geochronological data support an orogenic geochemical affinity, in accordance with the transitional tectonic regime between Variscan compression/transpression and post-collisional transtension/extension, related to the fragmentation of Pangea and thinning of the lithosphere. The lamprophyre dykes studied could represent the youngest pulse of Variscan orogenic magmatism and, therefore, mark its end in NE Iberia before the onset of the generalized Triassic extension.
publishDate 2021
dc.date.none.fl_str_mv 2
2021-01-01
2021
2021-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/250165
https://dx.doi.org/urn:doi:10.1344/GeologicaActa2021.19.15
url https://ddd.uab.cat/record/250165
https://dx.doi.org/urn:doi:10.1344/GeologicaActa2021.19.15
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 CGL-2015-66335-C2-2-R
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by-sa/4.0/
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
https://creativecommons.org/licenses/by-sa/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
reponame_str Dipòsit Digital de Documents de la UAB
collection Dipòsit Digital de Documents de la UAB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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