Mylonitic shear zone with felsic & mafic layers

Photogrammetric model of a mylonitic shear zone in the Cer metamorphic core complex at Bela Reka, central western Serbia, documented by Georg Löwe & Kamil Ustaszewski. Outcrop dimensions are 6 by 4 metres, north is to the left in the orientation shown at the outset. Outcrop coordinates: 44°38'41.3"N 19°28'11.1"E. This mylonitic shear zone contains felsic layers of s-type granitic composition, forming the leucosome, which are contained in mafic, amphibolite-grade metapelitic gneisses rich in garnet and biotite, forming the melanosome. The leucosome likely originated as veins of granitic composition from a nearby larger s-type granitoid body, but underwent strong rotational shear displacement during tectonic unroofing of both the granitoid and the metapelitic succession hosting it. The entire fabric is considered as representing 'vein-structured' or 'injected' migmatites. More info about the importance of this shear zone in this paper by Löwe et al. (2021), Tectonics, 40, https://doi.org/10.1029/2021TC006699.