“…3a). This is based on several arguments: experimental flowing evidence (Merle, 1998), theoretical evidence (Komar, 1972a(Komar, ,b, 1976, observation of strained vesicles (Coward, 1980;Rust and Manga, 2002), evolution of a magmatic fabric during a simple shear (Ildefonse and Fernandez, 1988;Ildefonse et al, 1992a,b;Arbaret et al, 1996Arbaret et al, , 2000Arbaret et al, , 2001Marques and Coelho, 2003) or a combination of simple and pure shear (Ježek et al, 1996). We consider that the flow pattern induces the coexistence of two strain regimes, evolving from simple shear, near the dike's wall to a mainly pure shear in the core of the dike (Fig.…”