Rare metal mineralization in albite-bearing granites of Western Trans-Baikal
https://doi.org/10.24930/1681-9004-2019-19-4-598-614
Abstract
Research subject. The article presents results of mineralogical and geochemical investigation of albite-bearing granites with high concentrations of trace elements located in the Western Trans-Baikal region.
Methods. The composition of rocks was determined by the methods of classical silicate analysis, X-ray fluorescence and ICP-MS analysis. Microstructural features, relationships and homogeneity of minerals were studied using an electron microscope LEO-1430 equipped with an energy dispersive spectrometer Inca Energy-300. Isotopic compositions of oxygen were carried out using a mass spectrometer Finigan MAT 253 in the mode of a constant helium flow.
Results. Ore mineralization is specified by the presence of Nb-bearing and less REE-bearing minerals. The studied rocks were divided into two groups: albitized granites, and deep albitized granites and albitites. These groups differ in terms of the presence of accessory minerals. The deep albitized granites and albitites belong to alkaline riebeckite-albite granites containing Nb-, Zr-, Y- and REE-bearing minerals. These rocks contain Y-bearing minerals - thalenite and yttrialite, with an up to 4 wt % inclusion of Y2O3 in titanite, chevkinite, thorite and monazite. In contrast, the albitized granites contain fewer amounts of Y and HREE along with LREE-bearing minerals (monazite, allanite, fluocerite, samarskit).
Conclusion. The selected groups of rocks have been analyzed in terms of their mineral and geochemical characteristics. The main Nb-bearing mineral in albitized granites is columbite. Minerals from albitites are rich in Y and HREE. The isotopic investigation has shown involvement of a magmatic-derived fluid in the rock formation process.
Keywords
albitization,
rare metal mineralization,
rare metal granites,
Western Transbaikalia Acknowledgements
Supporting agencies: Research conducted with the support of grants of President RF MK-1014.2019.5 and Russian Foundation for Basic Research 17-05-00129
About the Authors
M. O. Rampilov
Geological institute, SB RAS
Russian Federation
Russian Federation
Mikhail O. Rampilov
6а Sakhyanova st., Ulan-Ude, 670047
G. S. Ripp
Geological institute, SB RAS
Russian Federation
Russian Federation
German S. Ripp
6а Sakhyanova st., Ulan-Ude, 670047
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Review
For citations:
Rampilov M.O., Ripp G.S. Rare metal mineralization in albite-bearing granites of Western Trans-Baikal. LITHOSPHERE (Russia). 2019;19(4):598-614. (In Russ.) https://doi.org/10.24930/1681-9004-2019-19-4-598-614
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