Abstract
Unique accessory mineralization is recognized in the Turga massif of peraluminous Li-F granites in Eastern Transbaikalia. The abundance of rare LREE fluorides (fluocerite), fluorocarbonates (bastnaesite and parisite), and silicates (allanite), as well as (Y,REE,U,Th)–(Nb,Ta,Ti)-oxides (pyrochlore, samarskite) was found in the granites of this massif. The massif is characterized by a specific formation sequence manifested through a spontaneous rise in temperature at the stage of formation of microcline-albite granites with Li-siderophyllite of the main phase. This process is accompanied by the accumulation of a characteristic association of high field strength rare elements and fluorine. These features lead to a violation of the standard trend of rock evolution characteristic of the ore-bearing peraluminous granites of this region. The composition of accessory minerals and its evolution in the process of fractionation confirms the results of petrogeochemical studies of rocks and melt of this massif and provides a basis for attributing the Turga massif to a special geochemical subtype—peraluminous amazonite columbite-bearing granites of increased alkalinity with abundant Zr-REE-Th-U-Nb mineralization.
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