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This study deals with the interaction between deformation and magmatism in mid- to deep-crustaldomains. The relation is analysed between migmatites and shear zones and the spatial distribution of leucogranitoidveins and dykes running through a footwall migmatite system, and reaching a transtensionalshear zone operated under amphibolite- to greenschist-facies metamorphic conditions (Boa Fé shear zone,Variscan belt, SW Iberia). Statistical results show that the frequency of width and spacing of the leucogranitoiddykes conform to power-law distributions comparable with observations in volcanic systems. The fractalgeometry of the distribution of leucogranitoid dykes highlights the development of a dense framework ofthinner weakly or non-mineralized veins and dykes formed at higher nucleation/growth ratios in the footwallmigmatite system that contrasts with the emplacement of thicker dykes associated with strongly mineralizedthinner veins within the shear zone. The volume of injected leucogranitoid dykes in the shear zone is loweras compared with the footwall and is comparable with an expanding footwall shear zone with non-coaxialflow and volume increase. The Boa Fé shear zone seems to form a physical barrier to the transport of magma to the hanging wall

The role of strain localization in magma injection into a transtensional shear zone (Variscan belt, SW Iberia)