MECHANISMS OF HIGH-PURITY QUARTZITE FORMATION AT THE BURAL-SARDYK DEPOSIT (Russia)
D.Ts. Ayurzhanaeva1,2, A.M. Fedorov3, A.M. Mazukabzov4, A.I. Nepomnyashchikh3, E.A. Ochirova1, V.F. Posokhov1
1Banzarov Buryat State University, ul. Smolina 24a, Ulan-Ude, 67000, Russia
2Geological Institute, Siberian Branch of the Russian Academy of Sciences, ul. Sakh’yanovoi 6a, Ulan-Ude, 670047, Russia
3A.P. Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, ul. Favorskogo 1a, Irkutsk, 664033, Russia
4Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033, Russia
Keywords: High-purity quartzites, geologic structure, petrography of quartzites, geochemical features, formation mechanism
Abstract
The paper discusses the mechanisms of formation of high-purity quartzites from the Bural-Sardyk deposit. Based on a stadial analysis of the sedimentary-metamorphic sequence, we interpret the succession of postsedimentary transformations of high-silica rocks. Comprehensive studies using geological and geochemical methods and isotope research data reveal the role of tectonics, magmatism, metamorphism (regional and contact), and dynamic metamorphism in the formation of high-purity quartzites. Two main varieties of tectonites have been identified and described: stress-metamorphic tectonites and cataclasites. The paper presents a new geological map of the Bural-Sardyk deposit on a 1:10,000 scale.
DOI: 10.15372/RGG2020106
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