Early Permian Gabbro-granite Magmatism in Southern Rudny Altai: First U–Pb Geochronological and Geochemical Data

The manifestation of Early Permian intrusive magmatism in the territory of Rudny Altai have proven for the first time by geochronological methods (U–Pb LA-ICP-MS dating of magmatic zircon). It is represented by two associations: gabbro-diorite-syenite-granite-leucogranites with an age of 300–298 Ma (Bedarevka and Orlovka massifs) and granite-leucogranites with an age of 293–286 Ma years (Verkhne-Cheremshanka massif). The gabbro and diorites have geochemical features similar to intraplate basalts and can be compared with synchronous basites of the Mirolyubovka dyke complex in the nearboring Kalba-Narym terrane. The granitoids have geochemical features close to those of A-granites. The generation of granitic magmas is most likely the result of partial melting of lower- and middle- crustal sources under the effect of mafic magmas. Analysis of geological and geochemical data allows to conclude that the Early Permian gabbro-granite magmatism in Rudny Altai may be associated with the Tarim Large Igneous Province, associated with the mantle plume.