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Emplacement of the Lavadores granite (NW Portugal): U/Pb and AMS results
Martins, H C. B.; Santovaia, Helena; Abreu, J.; Oliveira, M.; Noronha, F.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 ...
Geocronologia e petrogénese do plutonismo tardi-varisco, NW de Portugal : sínte...
Dias, Graciete; Noronha, Fernando; Almeida, A.; Simões, P. P.; Martins, H. C. B.; Ferreira, NarcisoNo NW de Portugal ocorre um importante volume de granitóides, que correspondem a sucessivos pulsos magmáticos principalmente instalados na etapa pós-colisional da orogenia varisca (290-321 Ma). Trata-se de plutonismo com assinaturas químicas e isotópicas diversas e forte variabilidade composicional. No presente trabalho, apresenta-se uma síntese dos dados geocronológicos e petrogenéticos disponíveis e discut...
Geochronology and petrogenesis of late-Variscan plutonism, NW Portugal : synthe...
Dias, D.; Noronha, Fernando; Simões, P. P.; Almeida, A.; Martins, H. C. B.; Ferreira, Narciso
Geochronology and petrogenesis of late-Variscan plutonism (NW Portugal) : synth...
Dias, G.; Noronha, Fernando; Simões, P. P.; Almeida, Ângela; Martins, H. C. B.; Ferreira, NarcisoIn NW Portugal large volumes of granitoids were emplaced during the post-collisional stage of the Variscan orogeny. This was the main period of successive granite generation, which exhibit different chemical and isotopic signatures. Geochronological and petrogenetic results are presented and inferences on the geodynamic evolution of the Iberian Variscides are discussed.
Genesis and emplacement of felsic Variscan plutons within a deep crustal lineat...
Martins, H C. B.; Santovaia, H.; Noronha, F.Multidisciplinary studies integrating, U-Pb geochronology, whole-rock geochemical data, isotope geochemistry, anisotropy of magnetic susceptibility (AMS) studies and gravimetry were carried out on the Vila Pouca de Aguiar and the Aguas Frias-Chaves porphyritic biotite granite plutons. Both plutons occur independently in a distance of about 20 km. The Vila Pouca de Aguiar and Aguas Frias-Chaves plutons are examp...
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