Xenotime-(Y) from muscovite pegmatite of the southeastern extremity of the Kanin Peninsula
Xenotime-(Y) from muscovite pegmatite located in the southeastern extremity of the Kanin Peninsula within Precambrian rocks of the Mikulkinskaya Group metamorphosed under amphibolite facies conditions was studied. Xenotime-(Y) occurs as crystals 50-400 μm in size and syntactic intergrowths with zircon. We revealed patchy zoning internal texture of xenotime grains. The presence of alternating light and dark in BSE clusters enriched in U in varying degrees, the constancy of their composition, and the lack of correlation of the U and Th contents with other elements that constitute xenotime suggests that patchy zoning texture of xenotime-(Y) resulted from decomposition of high-temperature xenotime solid solution during cooling of the pegmatite body.