#STEREONET3D DOWNLOAD FOR WINDOWS 10 KEYGEN#
27 km thick, has been exposed ( Figure 1b), from the late Oligocene to present day tilting. In the Serre Massif ( Figure 1a), a Variscan continental crustal block, ca. In the literature, this shear zone is locally marked by the presence of mylonites (“m” in Figure 1c) or brittle faults (“tc” and “f” in Figure 1c) and can be traced for tens of kilometres south of the Curinga–Girifalco Line (CGL) ( Figure 1c). However, this shear zone has so far been neglected in its importance for tectono-metamorphic large-scale reconstructions. In this manuscript, we focus on a shear zone exposed in the northern Serre Massif (Calabria, Southern Italy) ( Figure 1a,b) along which the granulite-pyriclasite and the metapelite units of the lower Variscan crust have been tectonically juxtaposed ( Figure 1c). Their investigation and the unveiling of variations in mineral assemblages within are consequently relevant to understanding the polymetamorphic evolution of old terranes during subsequent orogenic processes. They represent the primary loci where metamorphism is readjusted and ductility is enhanced. In polymetamorphic terranes, ductile shear zones play a pivotal role in the rejuvenation of old continental crust, i.e., new structural fabric formation, overprinting of metamorphic assemblages and ages. These data question (i) that the Serre Massif represents an undisturbed continuous section of the Variscan crust, as generally suggested in the literature, and (ii) highlight the role of (eo-)Alpine high- P tectonics in the Serre Massif, recorded within mylonite zones, where the Variscan basement was completely rejuvenated. Average peak P– T conditions of 1.26–1.1 GPa and 572–626 ☌ were obtained using THERMOCALC software. During this tectono-metamorphic event, high- P mylonitic mineral assemblages were stabilized, consisting of chloritoid, kyanite, staurolite, garnet and paragonite, whereas plagioclase became unstable. Our observations reveal now that the formation of the new structural fabric within the shear zone was accompanied by changes in mineral assemblages, in a dominant compressive tectonic regime. It was never before studied in detail, although some late Cretaceous ages were reported for these mylonites, suggesting that this shear zone is of prime importance. We use a multidisciplinary approach to comprehend the structural, microstructural and petrologic changes that occurred along a, so far, not much considered shear zone affecting the Variscan lower crustal rocks. In the present study, we unveil the real significance of mylonitic reworking of the polymetamorphic crystalline basement in the Serre Massif of Calabria (Southern Italy).