Th-REE mineralization in Precambrian rocks of the Bashkirian meganticlinorium: diversity and genesis

Kovalev S. G., Kovalev S. S., Visotsky S. I.

Zapiski RMO (Proceedings of the Russian Mineralogical Society). 2017. V. 146. N 5. P. 59-80

Full text is available on eLIBRARY.RU

Language: Russian

Abstract

The paper presents new data on the Th-REE mineralization, which is common in clastic rocks of the Bashkirian meganticlinorium. The detailed description of new pas parageneses and associations found in rocks of Suran Formation (RF1) and Mashak Formation (RF2). From the study of the chemical composition of minerals, four mechanisms for the formation of thorium-rare-earth mineralization are proposed: «hydrothermal», «exocontact», «fluid-magmatic» and «alluvial-metamorphogenic». It is shown that the seeming of the mechanisms is realized at a certain stage of geodynamic development of the region.

Key words: Bashkir meganticlinorium, thorium-rare-earth mineralization, Suran Formation, Mashak Formation, rare-earth elements.