Affiliation:
1. Dobretsov Geological Institute, Siberian Branch of the Russian Academy of Science
2. North-East Interdisciplinary Scientific Research Institute, Far East Branch of the Russian Academy of Science
3. Institute of Geochemistry, Siberian Branch of the Russian Academy of Science
Abstract
Unusual zircon-titanomagnetite ores were discovered the ore field of the Tretyakovskoe gold-fluorite deposit, which is part of the Gilberinsky gold-silver-fluorite-rare-metal ore cluster. Quartz-fluorite vein-like bodies (vein zones) forming the deposit are areas of metasomatic argillization, fluoritization and silicification, with a thickness of about 0.3–1 m, rarely up to 2.3 m. A feature of quartz-fluorite ores of the Tretyakovskoe deposit is their increased gold content. According to exploration data, gold grades in ores vary from 0.3 to 19.5 ppm, with an average value of 3 ppm, silver – 1.9–18.6 ppm, with an average value of 7 ppm. Unusual zircon-titanomagnetite ores are composed of an aggregate of Fe-Ti minerals with rare thin veinlets of quartz-chlorite composition, containing numerous segregations of idiomorphic zircon crystals and rare dissemination relative to apatite, quartz and monazite. In situ U-Pb isotopic dating of zircon using LA-ICP-MS showed a value of – 277±1.5 Ma, corresponding to the age of rift magmatism in Western Transbaikalia. The discovery of such unusual zircon-titanomagnetite ores in association with gold-fluorite mineralization determines the possibility of finding a new type of complex ores similar to the precious metal ores of South Australia in the territory of Transbaikalia.
Publisher
The Russian Academy of Sciences
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