Emplacement of the Lavadores granite (NW Portugal): U/Pb and AMS results

Detalhes bibliográficos
Autor(a) principal: Helena C B Martins
Data de Publicação: 2011
Outros Autores: Helena Sant'Ovaia, Joana Abreu, Miguel Oliveira, Fernando Noronha
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: https://hdl.handle.net/10216/74623
Resumo: Studies of Anisotropy of Magnetic Susceptibility (AMS) and U-Pb geochronology, in zircon fractions, were carried out in a magnetite type-granite, the Lavadores granite, which is an example of a late to post-orogenic Variscan granite in northern Portugal (NW Iberian Peninsula). The U-Pb zircon analyses yield an age of 298 +/- 11 Ma that is considered to be the emplacement age of this granite and thus suggesting a post-tectonic emplacement. This is also supported by the magmatic nature of the microstructures. Magnetic lineations are subvertical and magnetic foliations display a general WNW-ESE subvertical pattern consistent with a dextral kinematic. These AMS data suggest that the emplacement of the Lavadores granite was controlled by a major mechanical anisotropy formed by transtensional structures associated with the Porto-Tomar shear zone.
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spelling Emplacement of the Lavadores granite (NW Portugal): U/Pb and AMS resultsCiências Naturais, Ciências da terra e ciências do ambienteNatural sciences, Earth and related Environmental sciencesStudies of Anisotropy of Magnetic Susceptibility (AMS) and U-Pb geochronology, in zircon fractions, were carried out in a magnetite type-granite, the Lavadores granite, which is an example of a late to post-orogenic Variscan granite in northern Portugal (NW Iberian Peninsula). The U-Pb zircon analyses yield an age of 298 +/- 11 Ma that is considered to be the emplacement age of this granite and thus suggesting a post-tectonic emplacement. This is also supported by the magmatic nature of the microstructures. Magnetic lineations are subvertical and magnetic foliations display a general WNW-ESE subvertical pattern consistent with a dextral kinematic. These AMS data suggest that the emplacement of the Lavadores granite was controlled by a major mechanical anisotropy formed by transtensional structures associated with the Porto-Tomar shear zone.20112011-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/10216/74623eng1631-071310.1016/j.crte.2011.05.002Helena C B MartinsHelena Sant'OvaiaJoana AbreuMiguel OliveiraFernando Noronhainfo: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:RCAAP2023-11-29T13:42:13Zoai:repositorio-aberto.up.pt:10216/74623Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T23:46:07.050182Repositório 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 Emplacement of the Lavadores granite (NW Portugal): U/Pb and AMS results
title Emplacement of the Lavadores granite (NW Portugal): U/Pb and AMS results
spellingShingle Emplacement of the Lavadores granite (NW Portugal): U/Pb and AMS results
Helena C B Martins
Ciências Naturais, Ciências da terra e ciências do ambiente
Natural sciences, Earth and related Environmental sciences
title_short Emplacement of the Lavadores granite (NW Portugal): U/Pb and AMS results
title_full Emplacement of the Lavadores granite (NW Portugal): U/Pb and AMS results
title_fullStr Emplacement of the Lavadores granite (NW Portugal): U/Pb and AMS results
title_full_unstemmed Emplacement of the Lavadores granite (NW Portugal): U/Pb and AMS results
title_sort Emplacement of the Lavadores granite (NW Portugal): U/Pb and AMS results
author Helena C B Martins
author_facet Helena C B Martins
Helena Sant'Ovaia
Joana Abreu
Miguel Oliveira
Fernando Noronha
author_role author
author2 Helena Sant'Ovaia
Joana Abreu
Miguel Oliveira
Fernando Noronha
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Helena C B Martins
Helena Sant'Ovaia
Joana Abreu
Miguel Oliveira
Fernando Noronha
dc.subject.por.fl_str_mv Ciências Naturais, Ciências da terra e ciências do ambiente
Natural sciences, Earth and related Environmental sciences
topic Ciências Naturais, Ciências da terra e ciências do ambiente
Natural sciences, Earth and related Environmental sciences
description Studies of Anisotropy of Magnetic Susceptibility (AMS) and U-Pb geochronology, in zircon fractions, were carried out in a magnetite type-granite, the Lavadores granite, which is an example of a late to post-orogenic Variscan granite in northern Portugal (NW Iberian Peninsula). The U-Pb zircon analyses yield an age of 298 +/- 11 Ma that is considered to be the emplacement age of this granite and thus suggesting a post-tectonic emplacement. This is also supported by the magmatic nature of the microstructures. Magnetic lineations are subvertical and magnetic foliations display a general WNW-ESE subvertical pattern consistent with a dextral kinematic. These AMS data suggest that the emplacement of the Lavadores granite was controlled by a major mechanical anisotropy formed by transtensional structures associated with the Porto-Tomar shear zone.
publishDate 2011
dc.date.none.fl_str_mv 2011
2011-01-01T00:00:00Z
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 https://hdl.handle.net/10216/74623
url https://hdl.handle.net/10216/74623
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 1631-0713
10.1016/j.crte.2011.05.002
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.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
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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