Abstract
Quartz c-axis fabrics from leucocratic gneisses of the Aracena metamorphic belt (southwestern Variscan Chain) record two different tectonic phases. The first one consists of a predominant flattening component and the local development of shear zones with a normal, top-to-the-north shear sense. The second phase resulted in the reactivation of the first-phase shear zones that subsequently acted with a reverse, top-to-the-south sense of displacement. Accordingly, it is suggested that the imprint of a non-coaxial deformation phase over a previous flattening phase leads to quartz c-axis fabrics defined by asymmetric small circles around the Z-axis of the finite-strain ellipsoid.
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