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Geochemistry and petrology of superpure quartzites from East Sayan Mountains, Russia

Acta Geochimica 2019年第1期38卷 22-39页

作者： A.M.fedorov v.A.Makrygina A.I.Nepomnyaschikh A.P.Zhaboedov A.v.Parshin v.f.posokhov Yu.v.Sokolnikova A.P.vinogradov Institute of Geochemistry SB RAS Irkutsk National Research Technical University Irkutsk Scientific Center SB RAS Irkutsk State University Geological Institute SB RAS

Quartzites are widespread within Earth's lithosphere, but their highly pure varieties occur quite infrequently. With the development of alternative energy sources, including solar, and with increasing demand for high-purity quartz for optics, interest has risen in highpurity silicon-bearing materials. The quartzites discovered in the southeast part of the Eastern Sayan Mountains are particularly attractive for exploration in terms of their raw material quality and feasibility to be enriched. for this reason, their genesis also merits study. Available geochemical data show that chemogenic(d^(18)O>29.2%)siliceous-carbonate sediments of the Irkut formation are fairly pure(impurity elements f the impurities are easily removed carbonate components of the rock. Bedded quartzites remote from the intrusive granitoids and near-contact quartzites were recognized based on geochemical and petrographic data. Influenced by the Sumsunur granitoids, the near-contact quartzites originally contained >0.9% impurities, but later, under the action of sliding slabs of ophiolite dynamothermal treatment reduced impurities to f only minor structural impurities is due to the enrichment capacity of superquartzites to 10.1 ppm(7.2 ppm under special conditions) of 10 elements: fe, Al, Ti, Ca, Mg, Cu,Mn, Na, K, and Li.

关键词： High-purity quartz Superquartzite Gravitational sliding Dynamic metamorphism Recrystallization

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