Emplacement of the Lavadores granite (NW Portugal): U/Pb and AMS results
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , , , |
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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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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7160 |
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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 |
repository.mail.fl_str_mv |
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1799135778391982080 |