Evolution of mineral forms of rare element accumulation in ore-bearing granites and meta-somatites of Verkhneurmiysk ore cluster (Priamur region)
- 1 — Ph.D., Dr.Sci. professor Saint-Petersburg Mining University
- 2 — engineer Saint-Petersburg Mining University
- 3 — Ph.D. leading researcher Saint-Petersburg Mining University
Abstract
It has been attempted to expand existing understanding of accessory mineralization evolution of rare metal-granite series at post-magmatic stage of their development and formation of associated hydrothermal deposits. Composition and distribution of rare elements of Verkhneurmiysk ore cluster have been examined from the position of mineralogy: the study focused on accessory and ore minerals Sn, W, Nb, Ta, Bi, Y, rare earth elements in rare metal Li-F granites and associated metasomatites. It has been discovered that accessory magmatic and hydrothermal mineral complexes share the same geochemical features, are formed under the leading role of abovementioned elements and consistently follow each other over time. It has been traced how mineral forms of accumulation of Sn, W, Nb, Ta, Y and rare earth elements evolve in the processes of magmatic crystallization and post-magmatic metasomatism in the time series: rare metal granites → zwitters → tourmalinites → chloritites. Mineral rocks of each stage were noted to inherit mineralogical and geochemical distinctions from the rocks of the previous stage. A significant number of minerals, forming in the course of two-three stages, have been discovered, as well as omnipresent magmagene-hydrothermal minerals. For a number of accessory minerals of rare metal granites post-magmatic generations have been identified. Special diversity among accessories of rare metal granites and zwitters was observed in tungsten, tin and bismuth minerals.
Funding
Research has been carried out with financial support from Russian Foundation for Basic Research (project No 14-05-00364а) and Ministry of Education and Science of Russian Federation (basic and project parts of the state order in the field of science No 5.9248.2017/VU in 2017-2019)