Multiple syntectonic granitoid intrusions during the Alpine development of the Rhodope Massif (southern Bulgaria): preliminary results

The Rhodope Massif, as part of the Alpine-Himalayan orogenic system, experienced several phases of continental subduction, collision, thrusting, extension and a widespread granitoid magmatism in Cretaceous and Tertiary times. On the basis of (i) the intimate interfingering of the multiple granitoid intrusions and the country rocks, (ii) the parallelism of foliation and intrusion/wall rock boundaries, and (iii) the high-temperature deformation microfabrics of quartz and feldspars, one of the granitoid bodies in the Migmatite-Orthogneiss sequence of the western Rhodope Massif, the Dolno Dryanovo Granite, is interpreted as a syntectonic intrusion. in addition, the deformation microfabrics indicate two distinct subsequent deformation events during upper amphibolite and during greenschist facies conditions. The development of the Dolno Dryanovo Granite points to the possible importance of the widespread magmatism for the large-scale kinematics and the metamorphic development of the Rhodope Massif.