%0 Journal Article
%A Díaz Azpiroz, Manuel
%A Fernández Rodríguez, Carlos
%A Castro, A.
%A El-Biad, M.
%T Tectonometamorphic evolution of the Aracena metamorphic belt (SW Spain) resulting from ridge-trench interaction during Variscan plate convergence
%D 2006
%@ 0278-7407
%U https://hdl.handle.net/20.500.14352/118867
%X [1] The Aracena metamorphic belt is a high-temperature/low-pressure (HT/LP) band located at the southern end of the European Variscan chain. It marks a suture between Armorica and Avalonia. This belt is characterized by (1) the presence of mid-ocean ridge basalt-derived metabasites that were affected by an inverted HT/LP metamorphism related to SW verging thrusting, whose thermal peak diachronously migrated eastward; (2) the occurrence of a HT/LP metamorphism, related to an extensional event, affecting continental rocks belonging to the Ossa Morena zone with peak temperatures that are ∼150°C higher than that recorded in the oceanic metabasites; and (3) the presence of near-trench magmatism with high-Mg andesite composition. These and other characteristics can be interpreted in terms of a ridge-trench-trench triple junction that migrated along the Armorican margin during Variscan oblique convergence.
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