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

LP-HT anatectic processes and lithological heterogeneity in the Mindelo Migmatite Complex (NW Portugal)

“…Thus, the magmatic rocks mainly represent orogenic granitoids, which are defined according to different age groups. In recent years both geochronological and structural data point to the definition of several intrusion times for iberian granitic rocks, which can be divided in three major groups: pre-orogenic granites, orogenic granites and post-orogenic granites (Ferreira et al, 1987;Díez Balda et al, 1995;Valle Aguado et al, 2005;Martins et al, 2011;Azevedo & Valle Aguado, 2013) ( Fig. 1B).…”

“…They are spatially related to low-pressure, high-temperature anatectic domains. Bt-rich granodiorites are mainly late with respect to the main deformation phases and are associated with strike slip faults and crustal-scale shear zones (Casquet et al, 1988;Martins et al, 2011).…”

The composition of zircon in Variscan granites from Northern Portugal

“…These two granites are slightly peraluminous (0.99<A/CNK<1.11) and have an I-type affinity. The U-Pb zircon dating yields a consistent age of 299 ± 3 Ma (Martins et al, 2009). The Vieira do Minho pluton is composed by the porphyrytic coarse-grained Vieira do Minho granite (VMG) and the medium-grained Moreira de Rei granite (MRG), both are biotite bearing granitic rocks of monzonitic-granodioritic composition (Almeida et al 2002;Martins et al 2013).…”

“…1). Their emplacement were controlled by tectonic regional structures during the late stages of the Variscan orogeny, mainly from 310 to 299 Ma (Martins et al, 2007(Martins et al, , 2009(Martins et al, , 2011(Martins et al, , 2013. The Vila pouca de Aguiar pluton consists of two main biotite-bearing granitic rocks of monzonitic composition, the coarse-grained Vila Pouca de Aguiar granite (VPAG) as the dominant facies and the more leucocratic medium-grained Pedras Salgadas granite (PSG).…”

“…In this paper, we study the composition of zircon from a group of late-to post-Variscan plutons in NW of Portugal which present variable typology (Martins et al, 2007(Martins et al, , 2009(Martins et al, and 2013Silva, 2010).…”