Rare-metal Granites of the Tigriny Massif (Sikvote-Alin): Geochemistry, Mineralogy and Specific Nature of Evolution

Rare-metal granites of the Tigriny massif, located in Central Sikhote-Alin, exhibit distinct geochemical and mineralogical characteristics associated with Sn-W mineralization. These granitoids show significantly elevated concentrations of fluorine and typomorphic trace elements, aligning them with Li-F rare-metal granitoids. The study reveals that the evolution of these magmas was driven by two primary processes: fluid-magmatic interaction leading to the formation of ultrapotassium pegmatoid granites (stocksheiders) and crystallization differentiation along an albite trend, resulting in lower-siliceous and sodium-rich melts. These melts likely formed in open or partially open systems, experiencing intense degassing during crystallization, which contributed to the formation of rich ore deposits, such as the Tigrenok greisen body. This process also led to the development of late plagioclase granites with lower fluorine and trace element contents compared to earlier rocks.

Kruk, N. N., Gavryushkina, O. A., Fedoseev, D. G., Orekhov, А.A., Kruk, E. A., Kasatkin, S. A., Mednikov, S. L.,. (2022). RARE-METAL GRANITES OF THE TIGRINY MASSIF (SIKHOTE-ALIN): GEOCHEMISTRY, MINERALOGY AND SPECIFIC NATURE OF EVOLUTION. Tikhookeanskaya Geologiya, 41(1), 46–64. https://doi.org/10.30911/0207-4028-2022-41-1-46-64