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

作     者：A.M.Fedorov V.A.Makrygina A.I.Nepomnyaschikh A.P.Zhaboedov A.V.Parshin V.F.Posokhov Yu.V.Sokolnikova 

作者机构：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 

出 版 物：《Acta Geochimica》 (地球化学学报（英文）)

年 卷 期：2019年第38卷第1期

页      面：22-39页

核心收录：

学科分类：07[理学] 

基　　金：performed under financial support of Integration Program No. 0341-2016-001 Russian Foundation for Basic Research Projects 15-05-02772a and 18-05-00439a with research equipment isotope-geochemical studies at IGC SB RAS 

主　　题：High-purity quartz Superquartzite Gravitational sliding Dynamic metamorphism Recrystallization 

摘      要：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)O29.2%)siliceous-carbonate sediments of the Irkut Formation are fairly pure(impurity elements 0.9% impurities, but later, under the action of sliding slabs of ophiolite dynamothermal treatment reduced impurities to 100 ppm, resulting in ‘‘superquartzites (highly pure quartzites). The presence of 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.