%0 Journal Article
%A Abati Gómez, Jacobo
%A Castiñeiras García, Pedro
%A Arenas Martín, Ricardo
%A Fernández Suárez, Javier
%A Gómez Barreiro, Juan
%A Wooden, Joseph L.
%T Using SHRIMP zircon dating to unravel tectonothermal events inarc environments. The early Palaeozoic arc of NW Iberia revisited
%D 2007
%@ 0954-4879
%U https://hdl.handle.net/20.500.14352/49775
%X Dating of zircon cores and rims from granulites developed in ashear zone provides insights into the complex relationshipbetween magmatism and metamorphism in the deep roots ofarc environments. The granulites belong to the uppermostallochthonous terrane of the NW Iberian Massif, which formspart of a Cambro-Ordovician magmatic arc developed in theperi-Gondwanan realm. The obtained zircon ages confirm thatvoluminous calc-alkaline magmatism peaked around 500 Maand was shortly followed by granulite facies metamorphismaccompanied by deformation at c. 480 Ma, giving a timeframework for crustal heating, regional metamorphism, deformationand partial melting, the main processes that control thetectonothermal evolution of arc systems. Traces of this arc canbe discontinuously followed in different massifs throughout theEuropean Variscan Belt, and we propose that the uppermostallochthonous units of the NW Iberian Massif, together with therelated terranes in Europe, constitute an independent andcoherent terrane that drifted away from northern Gondwanaprior to the Variscan collisional orogenesis.
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