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UDC (553.677:553.411):543.442.3(470.5) MUSCOVITES IN GOLD-ORE AND CRYSTAL-BEARING DEPOSITS OF THE URALS AND THEIR ROLE IN EXPLORATION
V. N. Ogorodnikov, V. V. Babenko, Yu. A. Polenov, A. N. Savichev
Mica minerals are very widespread and occur in every genetic type of rocks – magmatic, pegmatitic, metamorphic, metasomatic and sedimentary formations. Great geological and mineralogical importance of micas is not only due to the fact that micas are valuable mineral resources and widely occurring rock-forming minerals, but also because of their ability to adjust easily to different physical-chemical and thermodynamic conditions, while their structure features capture changes in geological settings which precede the formation of deposits of various genesis. Muskovite-phengite micas are among the most important rock-forming minerals for metamorphic and metasomatic rocks in various ore and non-ore deposits. Temperature and pressure have a profound impact on composition of such micas and influence on content of phengite and paragonite molecules in them. Clear correlation between crystal lattice parameters of muscovite and its chemical composition makes the X-ray structure analysis essential when interpreting genetic nature of the muscovites of alumosilicic metasomatites in crystal-bearing and gold-ore deposits.
Key words: muscovites, ferrimuscovites, phengites, pegmatites, metasomatites, gold-ore quartz veins, exploration criteria, X-ray structure analysis.
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