RT Journal Article
T1 Using SHRIMP zircon dating to unravel tectonothermal events inarc environments. The early Palaeozoic arc of NW Iberia revisited
A1 Abati Gómez, Jacobo
A1 Castiñeiras García, Pedro
A1 Arenas Martín, Ricardo
A1 Fernández Suárez, Javier
A1 Gómez Barreiro, Juan
A1 Wooden, Joseph L.
AB 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.
PB Blackwell Publishing Ltd
SN 0954-4879
YR 2007
FD 2007
LK https://hdl.handle.net/20.500.14352/49775
UL https://hdl.handle.net/20.500.14352/49775
LA eng
NO The definitive version is available at www.blackwell-synergy.com
DS Docta Complutense
RD 3 oct 2024