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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2011

Autores

Helena C B Martins (Autor) FCUP; Helena Sant'Ovaia (Autor) FCUP; Joana Abreu (Autor) Outra; Miguel Oliveira (Autor) Outra; Fernando Noronha (Autor) FCUP

Revista

Título: Comptes Rendus - Geoscience

Vol. 343 Nº 6

Páginas: 387-396

ISSN: 1631-0713

Editora: Academie des Sciences

Indexação

ISI Web of Knowledge - 23 Citações

ISI Web of Science

Scopus - 27 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Ciências da terra e ciências do ambiente

CORDIS: Ciências Naturais

Outras Informações

ID Authenticus: P-002-QM1

DOI: 10.1016/j.crte.2011.05.002

Abstract (EN): 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10