Abstract
Rare minerals represented by oxides, fluorides, F-carbonates and REE arsenates associated with monazite-Ce, monazite-Th, xenothym-Y and REE zonal fluorite were identified in rare-metal ores of the Sn-W deposits of the Malyi Khingan in Priamurye. Rare lanthanide minerals are described, such as fluocerite, bastnesite, gasparite-Ce, first found in Russia in Sn-W greisens, and chernovite-Y, which is the second find in the greisens of the Russian Far East. The processes of sequential replacement of xenothyme-Y and monazite-Ce by arsenic fluids in the late hydrothermal stage with the formation of various REE minerals with different lanthanide ratios are shown, and the difference is revealed in their chemical composition from that of the previously described similar minerals in other deposits of the world. Due to the different valence of arsenic and the unlimited isomorphism of rare earths, arsenates can be used as indicators of redox conditions of their deposition.
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