The Shaluty pluton is located 25 km south of Ulan-Ude. This massif represents a part of the larger Late Paleozoic pluton that is dismembered into a number of separate bodies being various in sizes, by younger granitoids. The area of the Shaluty massif is about 120 sq.km. It is composed by the quartz syenites and leucocratic granites that correspond to the two successive phases of introduction. The quartz syenites significantly predominate over leucogranites and are intruded by the combined quartz syenite-basite and aplite (leucogranite)-basite dykes and coeval gabbroids. The latter form several separate bodies that may be protrusions of the single massif.
Litvinovsky et al., Geology and Geophysics (1995).
Titov et al., Geology and Geophysics (1998).

     The Late Paleozoic Bryansky pluton belongs to the Mongol-Transbaikalian area of alkaline granitoids that stretches over 2000 km from the Mongolian Altai in the west to the Olyokma Stanovoi Range in the east. This area includes more than 350 plutons from the first tens to hundreds square kilometers in size. Most syenite-alkaline granite massives are concentrated in the Central Mongol-Transbaikalian area to south-east from Baikal. Among them, the Bryansky pluton is one of the largest. It occupies the area of 1600 sq.km, has roughly oval contours and very winding shape of contacts. The host formations are close by age granitoids (C3-P1) of the Angara-Vitim batholith; the pluton is locally overlapped by the Jurassic volcanic and sedimentary rocks and cut by small stocks of the Mesozoic leucogranites. The Brynsky plu-ton is composed by rocks of two successive syenite-granite series, i.e. metaluminum and peralkaline ones. Two stages are observed in both series: early syenite and late granite ones. The formation of pluton was preexisted by formation of trachydacite-trachyrhyolite and trachybasalt-comendite volcanic stratas, that are considered as volcanic comagamates of the Bryansky massif and united into the single volcano-plutonic sequence together with it.
Litvinovsky et al., Chemical Geology 189 (2002).

     The Ermakovka fluorine-beryllium deposit, being the largest one in Russia is located in Eastern Bury-atia, 140 km east of Ulan-Ude town. The deposit localizes in the metamorphosed carbonate-terrigene sediments of the suggested Proterozoic age that compose the large (10-12 sq.km) roof pendant in the area of the dominant Pre-Cambrian (?) and Paleozoic granitoids. The deposit area is in the pre-flange part of the Kizhinga Mesozoic depression. The Late Triassic intrusions that are spread in the deposit area are rep-resented by the pre-ore dykes of the middle and acid compositions and syn-ore stock of aegerine leuco-cranites being considered as a source of the ore-forming fluids.

     The fluorite-beryllium mineralization forms mostly by the layer metasomatic zones of complex inner structure that are extended enough by strike and dip. They belong to the slopes and core part of syncline and mostly occur within the batch of the carbonate rock and schist interbedding. 9 ore zones with balance reserves have been distinguished at the deposit. The average content of BeO in ores equaled 1.3% at the start of the development. In the remaining ores, the contents of BeO and fluorite average 1.19% and 24.6% respectively. The groundmass of BeO (92-93%) is concentrated in bertrandite and phenacite, the other Be minerals (melinophane, leucophane, eudidymite, bavenite, milarite and helvite) that occur spo-radically make up 7-8%.
Reyf, Chemical Geology, 210 (2004).