Rare-Metal Granites of the Tigriny Massif (Sikhote-Alin): Geochemistry, Mineralogy and Evolution

A rare-metal granite intrusion in Central Sikhote-Alin, associated with significant Sn-W mineralization, exhibits distinct geochemical and mineralogical features. The Tigriny Massif's granitoids are characterized by high fluorine content and trace elements, aligning with Li–F rare-metal granitoids. Two primary processes governed their evolution: fluid-magmatic interaction, producing ultrapotassic pegmatoid granites, and crystallization differentiation along the albite trend, leading to lower-silica aluminous sodic melts. These final phases likely formed under open or partially open-system conditions, experiencing intense degassing during crystallization. This process resulted in late plagioclase granites with reduced fluorine and trace elements. The study identifies that the separation of high-F fluids enriched in trace alkalis and ore components led to the formation of the Tigrenok greisen body, hosting the richest ores of the Tigriny deposit.

Kruk, N. N., Gavryushkina, O. A., Fedoseev, D. G., Orekhov, A. A., Kruk, E. A., Kasatkin, S. A., & Mednikov, S. L. (2022). Rare-Metal Granites of the Tigriny Massif (Sikhote-Alin): Geochemistry, Mineralogy and Evolution. Russian Journal of Pacific Geology, 16(1), 42–61. https://doi.org/10.1134/s1819714022010079