MATERIAL STRUCTURE AND PETROGENESIS OF GRANITOIDS OF THE BRAGIN GRANULITE MASSIF (BELARUS)
A.A. Tolkachikova
E-mail: geology@ns.igs.ac.by
E-mail: geology@ns.igs.ac.by
Petrographical and petrogeochemical features of granitoid rocks abundant within the Bragin granulite massif (the crystalline basement of the eastern part of the Pripyat Through) have been discussed in the paper. A detailed study was used to distinguish the Kopan massif of intrusion rocks located in the northeast of the region, and migmatite-granites and granite veins have been described too.
The paleogeodynamic conditions of rock formation have been assessed. A peculiar feature of the geological evolution of the granulite-gneissic complex in the studied region is a polyphase operation of the processes of metamorphism and magma generation. A close connection with enclosing metamorphic rocks (aluminous gneisses) is characteristic of the greater portion of migmatite granitoids of the Bragin granulite massif, that is indicative of their anatectic origin.
The Gaisin complex of the Ukrainian shield was distinguished as a probable analogue of the magmatic complex of the Kopan massif, when correlations with the Ukrainian shield were carried out.