Geological and geochemical features of the early proterozoic Lianshanguan uranium deposit, Liaoning province, northeastern China

The geological and geochomical features of Lianshanguan uranium deposit are studied and the genesis of the deposit is also discussed. Two genetic types of uranium mineralization can be classified: sedimento-metamorphic type and alkaline hydrothermal vein type. The U-Pb isotopic ages are 2085.6 Ma and 1974.8 Ma, respectively. Uranium minerals of economic significance are pitchblende and uraninite, coffinites in minor amount are also found. The orebodies are localized in alkali metasomatites and uranium mineralization was controlled by alkali metasomatism in time and space. It belongs to a uranium deposit of multiple stages and geneses mainly of middle-high temperature alkali metasomatism hydro-thermal origin. Uranium source in the deposit is principally derived from the Lianshanguan massif and mobilization and migration of uranium related to alkali metasomatism