ABOUT FINDING NATIVE GOLD, SILVER, COPPER, LEAD, BISMUTH AND TUNGSTEN IN LIPOVKA PEGMATITES (MIDDLE URAL)
| Autor: | A. V. Zakharov, V. V. Khiller |
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| Jazyk: | němčina |
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Izvestiâ Uralʹskogo Gosudarstvennogo Gornogo Universiteta, Iss 2(50), Pp 15-19 (2018) |
| ISSN: | 2500-2414 2307-2091 |
| Popis: | The relevance of the work is conditioned by the need for a more complete study of the mineralogy of rare-metal granite pegmatites of the Lipovskoye vein field. The purpose of the study is to describe the findings of native metals (gold, silver, copper, lead, bismuth and tungsten) in granite pegmatites of the Lipovskoye vein field. Research methodology. Detailed study of chemical composition, morphology and relationships of native metals with associated minerals. For this study we have chosen samples from the three types of granitic pegmatites – classical quartz-feldspar (mostly intragranitic), desilicated (apogranite plagioclasite) and contaminated lithium-bearing. Results. The paper describes native metals (gold, silver, copper, lead, bismuth and tungsten), which we have found in rare-metal pegmatites of the Lipovskoye vein field. The discovery of the native metals is the first on this facility. The microprobe analysis of such native metals as gold and silver showed the variability of their chemical composition from the type of pegmatite in which they are present. The formation of native lead should be logically linked to the destruction and recrystallization of high uranium thin rims of zircons. The formation of bismuth and tungsten may have occurred during recrystallization of accessory tantalumniobates. Summary. The finding of the native metals in granitic pegmatites is quite explainable. This is because these core rocks are formed in the post-magmatic stage of the silicate crystallization intrusions and they can contain typomorphic rocks for these metals. The absence of mineral concentrators (sulfides) in pegmatites clearly explains the small size and high dispersion of metals. |
| Databáze: | OpenAIRE |
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