Surmetashskii is a ring intrusion which is elliptical in plan. The country rocks are limestones, dolomites and schists. There are two principal intrusive phases: alkaline quartz-bearing syenites and tourmaline-bearing granites. Nepheline syenites are concentrated in the south of the intrusion with the central areas occupied by alkaline olivine-bearing melano- and leucocratic syenites. These rocks gradually pass into quartz-bearing syenites, in which veins and irregular patches of pegmatite and dykes of hybrid syenite are developed as well as skarn xenoliths.
KAYUMOV, A.K. and KARABAEV, K.K. 1981. Alkaline magmatism and ore-formation of the south Tyan-Shan. Uzbek Academy of Science Publishers, Tashkent. 135 pp.
SHINKAREV, N.F. 1966. Upper Palaeozoic magmatism of Turkestan-Alay. Leningrad University Publishers, Leningrad. 152 pp.