Geological setting of the Roses granodiorite (E-Pyrenees, Spain)



The Hercynian-aged Roses Granodiorite displays a heterogeneously developed gneissic-mylonitic foliation, developed along bands ranging in width from a few centimeters to about 500 meters. The foliation bands have anastomosing and fanning dispositions, such that the poles to the foliation planes are spread along great circles although a quite regular orientation of the associated mineral elongation lineation is maintained. The grandiorite was emplaced cutting across a regional schistosity in the probable Ordovician-aged metasedimentary host rocks. Both rock types were then deformed together during the main late-Hercynian folding phase in the region. The different mechanical properties of the rocks as they underwent this late phase of deformation resulted in the formation of crenulation folds in the metasediments and shear zones in the granodiorite

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