FORMATIONAL AFFINITY AND GEODYNAMIC CONDITIONS FOR THE FORMATION OF GABBROIDS OF THE KANZAFAROVO COMPLEX (BOUNDARY AREA OF THE SOUTHERN AND MIDDLE URALS)
The article presents new data on the geology and petrogeochemistry of the Kanzafar complex located in the extreme northern part of the Southern Urals near the border with the Aramil-Suhtelin zone. The gabbroids of the complex under consideration differ sharply from the analogous rocks of neighboring structural-formation zones by elevated TiO2, P2O5 K2O, K2O + Na2O contents, as well as titanomagnetite metallogenic specialization. On a number of characteristic diagrams, including TiO2 - (Na2O + K2O), Rb-Sr, REE - CREE, Kanzafar gabbro form compact fields within the region of the gabbro-granite formation of the Magnitogorsk megazone. The authors showed that the source of matter that generates the main intrusive bodies is mantle, not continental crust. By the content of rubidium; strontium, rare-earth and other small elements, the considered massifs are close to the rocks that form in the rear of island arcs in the continental riftogenic geodynamic environment. Taking into account the fact that gabbro-diorite arrays of the Kanzafar complex are located on the northern extension of the South Ural zone of Early Carboniferous rifting and their formation is associated with the manifestation of magmatism in the rift regime on the dead island arc, it is possible to connect the South Ural and Middle Urals segments of the rift into a single sub-meridional zone.