Open AccessRARE-METAL GRANITES OF THE TIGRINY MASSIF (SIKHOTE-ALIN): GEOCHEMISTRY, MINERALOGY AND SPECIFIC NATURE OF EVOLUTION
Author(s) -
Н. Н. Крук,
AUTHOR_ID,
O. A. Gavryushkina,
D. G. Fedoseev,
А. А. Орехов,
Е. А. Крук,
С. А. Касаткин,
Semen L. Mednikov,
AUTHOR_ID,
AUTHOR_ID,
AUTHOR_ID,
AUTHOR_ID,
AUTHOR_ID,
AUTHOR_ID
Publication year - 2022
Publication title -
tihookeanskaâ geologiâ
Language(s) - English
Resource type - Journals
ISSN - 0207-4028
DOI - 10.30911/0207-4028-2022-41-1-46-64
Subject(s) - geology , massif , geochemistry , plagioclase , albite , mineralization (soil science) , fractional crystallization (geology) , mineralogy , quartz , mantle (geology) , soil water , paleontology , soil science
The article describes the geological setting, geochemical features of rocks and the composition of the main minerals (micas, feldspars) of the granitoids of the Tigriny intrusion (Central Sikhote-Alin), associated with Sn-W mineralization. It is shown that the granitoids have sharply increased concentrations of fluorine and typomorphic trace elements, corresponding in geochemical characteristics to Li-F rare-metal granitoids. The evolution of rare-metal-granite magmas of the Tigriny massif was controlled by two main processes: fluid-magmatic interaction, which led to the formation of ultrapotassium pegmatoid granites – stocksheiders, and crystallization differentiation along the albite "trend", which led to the formation of relatively lower-siliceous and sodium melts. They, most likely, were introduced in an open or partially open system and experienced intense degassing during crystallization, which resulted in the formation of the main volume of the richest ores of the Tigriny deposit (Tigrenok greisen body) and determined the formation of late plagioclase granites with lower contents of fluorine and typomorphic trace elements as compared to the preceding rocks.