Los diques de lamprófido del plutón de Panticosa (Zona Axial Pirenaica): emplazamiento simultáneo con la extensión tardihercínica The lamprophyre dikes in the Panticosa Pluton (Pyrenean Axial Zone): syn-emplacement with later-hercynian extension

The Panticosa Pluton shows two groups of lamprophyre dykes with calcalkaline and alkaline affinities, which are emplaced during the Lower-Middle Permian interval. A clear relationship between their orientations, dimensions and composition does not occur. The kinematic analysis of the dykes gives a near N-S extension direction compatible with the orientation of the displacement vector measured in the field. The structural data related to the dyke geometry and kinematics and the fracturing pattern of the granitic pluton allow to propose an emplacement model for both lithotypes within a common extensional framework; this model includes both the former Lower Permian calc-alkaline magma, affected by crustal contamination and the Middle Permian mantle alkaline magma. This extensional regime post-dates the Upper Carboniferous transpressive regime responsible for the emplacement and fracturing of the granitic pluton.