Mantle-like Sr-Nd isotope composition of Fe-K subalkaline granites : the Peneda-Gerês Variscan massif (NW Iberian Peninsula)

Detalhes bibliográficos
Autor(a) principal: Mendes, Anabela Carreira
Data de Publicação: 2004
Outros Autores: Dias, G.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/1822/1769
Resumo: The Peneda-Gerês massif is one of the most representative NW Iberian late- to post-orogenic Variscan granitic plutons. It resulted essentially from the subsynchronous emplacement, at 290-296 Ma, of two granitic magmas of Fe-K subalkaline affinity, with primitive isotopic composition: Sri = 0.703-0.707 and eNdi = -1.5 to -2.4. An origin by mantle input followed by mantle-crust interactions is proposed, implying the contribution of a less enriched mantle component than that involved in the genesis of syn-orogenic hybrid granitoids of Mg-K subalkaline affinity. A less voluminous aluminopotassic and isotopically more evolved magma (Sri = 0.708-0.709 and eNdi = -3.5 to –3.9) with little or no mantle input was also generated, suggesting the involvement of lower crust materials. Therefore, this study suggests an input of juvenile magmas in late-Variscan times, the mantle-like isotope signature of Fe-K granitic magmatism being clearly related to a geodynamic setting of extensional processes, large-scale uplift and thinning.
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spelling Mantle-like Sr-Nd isotope composition of Fe-K subalkaline granites : the Peneda-Gerês Variscan massif (NW Iberian Peninsula)GraniteVariscanIsotopeIberiaPetrogenesisMantleScience & TechnologyThe Peneda-Gerês massif is one of the most representative NW Iberian late- to post-orogenic Variscan granitic plutons. It resulted essentially from the subsynchronous emplacement, at 290-296 Ma, of two granitic magmas of Fe-K subalkaline affinity, with primitive isotopic composition: Sri = 0.703-0.707 and eNdi = -1.5 to -2.4. An origin by mantle input followed by mantle-crust interactions is proposed, implying the contribution of a less enriched mantle component than that involved in the genesis of syn-orogenic hybrid granitoids of Mg-K subalkaline affinity. A less voluminous aluminopotassic and isotopically more evolved magma (Sri = 0.708-0.709 and eNdi = -3.5 to –3.9) with little or no mantle input was also generated, suggesting the involvement of lower crust materials. Therefore, this study suggests an input of juvenile magmas in late-Variscan times, the mantle-like isotope signature of Fe-K granitic magmatism being clearly related to a geodynamic setting of extensional processes, large-scale uplift and thinning.Blackwell PublishingUniversidade do MinhoMendes, Anabela CarreiraDias, G.20042004-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/1769eng"Terra nova". ISSN 0954-4879. 16:3 (2004) 109-115.0954-487910.1111/j.1365-3121.2004.00537.xinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:12:53Zoai:repositorium.sdum.uminho.pt:1822/1769Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:04:54.267360Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Mantle-like Sr-Nd isotope composition of Fe-K subalkaline granites : the Peneda-Gerês Variscan massif (NW Iberian Peninsula)
title Mantle-like Sr-Nd isotope composition of Fe-K subalkaline granites : the Peneda-Gerês Variscan massif (NW Iberian Peninsula)
spellingShingle Mantle-like Sr-Nd isotope composition of Fe-K subalkaline granites : the Peneda-Gerês Variscan massif (NW Iberian Peninsula)
Mendes, Anabela Carreira
Granite
Variscan
Isotope
Iberia
Petrogenesis
Mantle
Science & Technology
title_short Mantle-like Sr-Nd isotope composition of Fe-K subalkaline granites : the Peneda-Gerês Variscan massif (NW Iberian Peninsula)
title_full Mantle-like Sr-Nd isotope composition of Fe-K subalkaline granites : the Peneda-Gerês Variscan massif (NW Iberian Peninsula)
title_fullStr Mantle-like Sr-Nd isotope composition of Fe-K subalkaline granites : the Peneda-Gerês Variscan massif (NW Iberian Peninsula)
title_full_unstemmed Mantle-like Sr-Nd isotope composition of Fe-K subalkaline granites : the Peneda-Gerês Variscan massif (NW Iberian Peninsula)
title_sort Mantle-like Sr-Nd isotope composition of Fe-K subalkaline granites : the Peneda-Gerês Variscan massif (NW Iberian Peninsula)
author Mendes, Anabela Carreira
author_facet Mendes, Anabela Carreira
Dias, G.
author_role author
author2 Dias, G.
author2_role author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Mendes, Anabela Carreira
Dias, G.
dc.subject.por.fl_str_mv Granite
Variscan
Isotope
Iberia
Petrogenesis
Mantle
Science & Technology
topic Granite
Variscan
Isotope
Iberia
Petrogenesis
Mantle
Science & Technology
description The Peneda-Gerês massif is one of the most representative NW Iberian late- to post-orogenic Variscan granitic plutons. It resulted essentially from the subsynchronous emplacement, at 290-296 Ma, of two granitic magmas of Fe-K subalkaline affinity, with primitive isotopic composition: Sri = 0.703-0.707 and eNdi = -1.5 to -2.4. An origin by mantle input followed by mantle-crust interactions is proposed, implying the contribution of a less enriched mantle component than that involved in the genesis of syn-orogenic hybrid granitoids of Mg-K subalkaline affinity. A less voluminous aluminopotassic and isotopically more evolved magma (Sri = 0.708-0.709 and eNdi = -3.5 to –3.9) with little or no mantle input was also generated, suggesting the involvement of lower crust materials. Therefore, this study suggests an input of juvenile magmas in late-Variscan times, the mantle-like isotope signature of Fe-K granitic magmatism being clearly related to a geodynamic setting of extensional processes, large-scale uplift and thinning.
publishDate 2004
dc.date.none.fl_str_mv 2004
2004-01-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/1822/1769
url http://hdl.handle.net/1822/1769
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv "Terra nova". ISSN 0954-4879. 16:3 (2004) 109-115.
0954-4879
10.1111/j.1365-3121.2004.00537.x
dc.rights.driver.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 Blackwell Publishing
publisher.none.fl_str_mv Blackwell Publishing
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
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instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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