This somewhat elongated stock of 2x0.7-1.0 km lies within sandstones. The intrusion is concentric, as indicated by the mineral fabric, and comprises three intrusive phases, namely (1) peralkaline syenites, which form the periphery, (2) nepheline syenites, which are confined to the centre, and (3) syenite porphyries and aplites and small pegmatitic bodies of sodalite, feldspar and hastingsite.
NURLIBAYEV, A.N. 1973. Alkaline rocks of Kazakhstan and their ore deposits. Nauka, Alma-Ata. 296 pp.