Hercynian late-post-tectonic granitic rocks from the Fornos de Algodres area (Northern Central Portugal)

Detalhes bibliográficos
Autor(a) principal: Azevedo, M. R.
Data de Publicação: 1998
Outros Autores: Nolan, J.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10773/13025
Resumo: The Fornos de Algodres Complex (FAC) comprises several intrusions of late-post-tectonic Hercynian granitic rocks ranging in composition from hornblende granodiorites and quartz monzodiorites, through coarse porphyritic biotite granites and two-mica granites (coarse-, medium- and fine-grained), to muscovite-rich leucogranites. Field and regional constraints show that the emplacement of this large, composite, batholithic complex post-dates the main Variscan regional deformation phases (D1 + D2 + D3) and associated metamorphic events. Field, petrographic and geochemical data suggest a strong genetic relationship between most of the members of the FAC. However, their Rb-Sr and Sm-Nd isotopic signatures appear to rule out any genetic process involving a single homogeneous source and/or closed-system fractional crystallization of the same parental magma. A model involving hybridization of mantle-derived basaltic liquids with crustal anatectic melts followed by further contamination and fractional crystallization is proposed to explain the isotopic and geochemical variation trends defined by the FAC granitic rocks.
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spelling Hercynian late-post-tectonic granitic rocks from the Fornos de Algodres area (Northern Central Portugal)AssimilationFractional crystallizationGranitesHybridizationIberian Variscan Fold BeltMagma mixingPortugalHercynian orogenyThe Fornos de Algodres Complex (FAC) comprises several intrusions of late-post-tectonic Hercynian granitic rocks ranging in composition from hornblende granodiorites and quartz monzodiorites, through coarse porphyritic biotite granites and two-mica granites (coarse-, medium- and fine-grained), to muscovite-rich leucogranites. Field and regional constraints show that the emplacement of this large, composite, batholithic complex post-dates the main Variscan regional deformation phases (D1 + D2 + D3) and associated metamorphic events. Field, petrographic and geochemical data suggest a strong genetic relationship between most of the members of the FAC. However, their Rb-Sr and Sm-Nd isotopic signatures appear to rule out any genetic process involving a single homogeneous source and/or closed-system fractional crystallization of the same parental magma. A model involving hybridization of mantle-derived basaltic liquids with crustal anatectic melts followed by further contamination and fractional crystallization is proposed to explain the isotopic and geochemical variation trends defined by the FAC granitic rocks.Elsevier10000-01-01T00:00:00Z1998-01-01T00:00:00Z1998info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/13025eng0024-493710.1016/S0024-4937(98)00019-XAzevedo, M. R.Nolan, J.info: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:RCAAP2024-02-22T11:23:40Zoai:ria.ua.pt:10773/13025Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:48:59.361558Repositório 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 Hercynian late-post-tectonic granitic rocks from the Fornos de Algodres area (Northern Central Portugal)
title Hercynian late-post-tectonic granitic rocks from the Fornos de Algodres area (Northern Central Portugal)
spellingShingle Hercynian late-post-tectonic granitic rocks from the Fornos de Algodres area (Northern Central Portugal)
Azevedo, M. R.
Assimilation
Fractional crystallization
Granites
Hybridization
Iberian Variscan Fold Belt
Magma mixing
Portugal
Hercynian orogeny
title_short Hercynian late-post-tectonic granitic rocks from the Fornos de Algodres area (Northern Central Portugal)
title_full Hercynian late-post-tectonic granitic rocks from the Fornos de Algodres area (Northern Central Portugal)
title_fullStr Hercynian late-post-tectonic granitic rocks from the Fornos de Algodres area (Northern Central Portugal)
title_full_unstemmed Hercynian late-post-tectonic granitic rocks from the Fornos de Algodres area (Northern Central Portugal)
title_sort Hercynian late-post-tectonic granitic rocks from the Fornos de Algodres area (Northern Central Portugal)
author Azevedo, M. R.
author_facet Azevedo, M. R.
Nolan, J.
author_role author
author2 Nolan, J.
author2_role author
dc.contributor.author.fl_str_mv Azevedo, M. R.
Nolan, J.
dc.subject.por.fl_str_mv Assimilation
Fractional crystallization
Granites
Hybridization
Iberian Variscan Fold Belt
Magma mixing
Portugal
Hercynian orogeny
topic Assimilation
Fractional crystallization
Granites
Hybridization
Iberian Variscan Fold Belt
Magma mixing
Portugal
Hercynian orogeny
description The Fornos de Algodres Complex (FAC) comprises several intrusions of late-post-tectonic Hercynian granitic rocks ranging in composition from hornblende granodiorites and quartz monzodiorites, through coarse porphyritic biotite granites and two-mica granites (coarse-, medium- and fine-grained), to muscovite-rich leucogranites. Field and regional constraints show that the emplacement of this large, composite, batholithic complex post-dates the main Variscan regional deformation phases (D1 + D2 + D3) and associated metamorphic events. Field, petrographic and geochemical data suggest a strong genetic relationship between most of the members of the FAC. However, their Rb-Sr and Sm-Nd isotopic signatures appear to rule out any genetic process involving a single homogeneous source and/or closed-system fractional crystallization of the same parental magma. A model involving hybridization of mantle-derived basaltic liquids with crustal anatectic melts followed by further contamination and fractional crystallization is proposed to explain the isotopic and geochemical variation trends defined by the FAC granitic rocks.
publishDate 1998
dc.date.none.fl_str_mv 10000-01-01T00:00:00Z
1998-01-01T00:00:00Z
1998
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/10773/13025
url http://hdl.handle.net/10773/13025
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 0024-4937
10.1016/S0024-4937(98)00019-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 Elsevier
publisher.none.fl_str_mv Elsevier
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
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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