stripes
This complex has very irregular, sinuous outlines and an area of 150 km2. The country rocks are granites, syenites and quartz syenites of middle and late Palaeozoic age, as well as Eocambrian limestones and schits and Permian trachytes and trachyrhyolites. The principal rock type of Ubukitskii is a coarse-grained moderately alkaline syenite in which, in places, there are xenoliths of microdiorite. The complex is cut by numerous veins of leucogranite, aplite and granosyenite. Later rocks are represented by relatively fine-grained peralkaline and subalkaline syenites, quartz syenites and granites. The peralkaline syenites are leucocratic rocks in which the dark-coloured minerals are riebeckite and rarely biotite.
ZANVILEVICH, A.N., LITVINOVSKY, B.A. and ANDRE’E V, G.V. 1985. The Mongolian-Transbaikalian alkali-granitoid province (geology and petrology). Nauka, Moscow. 232 pp.