Mald'Zhangarskii

Mald'zhangarskii is situated along the upper reaches of the River Mald'zhangarka and forms a steep highland area with a diameter of about 4.5 km. The country rocks are Archaean gneisses and schists. The central stock of the intrusion is composed of medium- and fine-grained calcitic and dolomitic carbonatites which contain xenoliths of quartz-K-feldspar fenites. Apart from carbonates, the principal minerals of the carbonatite stock are amphibole, aegirine, phlogopite, apatite and subordinate magnetite, ilmenite, leucoxene, pyrochlore and zircon. Peripheral to the carbonatite stock there is a fenite zone about 40 m wide of quartz-hematite and quartz-carbonate-microcline-hematite rocks. There is an incomplete outer ring of carbonatite cutting the Archaean basement rocks.