Kshi-Orda (Abachevskii)

The Kshi-Orda complex cuts through syenites, diorites and monzonites of the Bakshory complex, which are probably Silurian in age. It occupies about 10 km2 and forms a partial ring structure which extends along a northwesterly line. The contacts dip at 60-70°. Within the massif there are systems of steep fractures which control the igneous structures. Zonality is strongly marked in the complex with the outermost zone composed of pink liebenerite syenites. The next zone inwards comprises hastingsite-nepheline syenites, which have a circular distribution and gradually grade into nepheline syenites via a zone of nepheline syenites in which muscovite is developed. The central part of the complex is composed of albitised nepheline syenites. Dykes that are developed along circular and radial fissure systems are from 15-20 cm in thickness and extend for 100-200 m. The dykes are nepheline syenites with aplitic textures and occasional aegirine granites.