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Geology of Ore Deposits

, Volume 61, Issue 4, pp 359–380 | Cite as

Mineral Associations and Mo–W Ore Types of the Slepaya Zalezh’ Orebody at the Tyrnyauz Deposit

  • E. N. GramenitskiyEmail author
  • O. V. Kononov
Article
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Abstract—

Slepaya Zalezh’, the largest orebody of the Tyrnyauz Mo–W deposit, is considered a first-priority object should mining operations at the deposit be resumed. Molybdoscheelite, scheelite, and molybdenite impregnation in mineable concentrations is genetically related to metasomatites of the productive stage overprinted on skarns, periskarn rocks, hornfelses, and marble. Ore types have been recognized based on the relative amounts of different ore-bearing metasomatite facies and protoliths acting as a diluting mass. Seven ore types have been recognized and mapped in cross section. Types I and II are characterized by predominant (70–90%) aposkarn ores after endo- and exoskarns, accordingly. Type III is characterized by approximately equal proportions of ores after endoskarns and periskarn rocks; type IV differs from type III by a decrease in periskarn rocks replenished by an increase in hornfels. Type V is dominated by ores after exoskarns and, to a lower extent (up to 25%), after marble. Type VI is intermediate between types III and IV. Type VII represents all protoliths in approximately equal proportions. Each type exhibits a stable mineral and chemical composition inherited from the protolith. The ores of each particular type have simple distinguishing features, convenient for logging and mapping, which can be used for manual picking of grab and bulk samples and preliminary ore separation. The ores exhibit narrow ranges of variation in sizes and shapes of ore mineral grains and intergrowths and concentrations of minerals harmful to flotation. The subtle differences in ore mineral concentrations between ore types enable their selective mining and blending. Maps and cross sections contain data on the spatial distribution of the associated components such as garnet and wollastonite in skarns and productive metasomatites, pyroxene–plagioclase periskarn rocks, and hydrothermally altered rocks with Cu, Au, and other mineralization.

Keywords:

ore types mapping Slepaya Zalezh’ orebody Tyrnyauz deposit mineral associations productive metasomatites skarns periskarn rocks molybdoscheelite scheelite molybdenite 

Notes

REFERENCES

  1. 1.
    Borsuk, A.M., Mezozoiskie i kainozoiskie magmaticheskie formatsii Bol’shogo Kavkaza (Mesozoic and Cenozoic Magmatic Formations of the Greater Caucasus), Moscow: Nauka, 1979.Google Scholar
  2. 2.
    Gramenitskaya, P.N., Gramenitskiy, E.N., and Kononov, O.V., Cemical types of amphiboles from the Tyrnyauz Deposit, Moscow Univ. Geol. Bull., 2013, vol. 68, no. 4, pp. 242–252.CrossRefGoogle Scholar
  3. 3.
    Gramenitskiy, E.N., Petrologiya metasomaticheskikh porod (Petrology of Metasomatic Rocks), Moscow: INFRA-M, 2012.Google Scholar
  4. 4.
    Gramenitskiy, E.N., Mineral assemblages and chemistry of biotite series minerals from the Tyrnyauz Deposit, Zap. Ross. Mineral. O-va, 2016a, no. 1, pp. 105–121.Google Scholar
  5. 5.
    Gramenitskiy, E.N., Wall-Rock alteration of biotite hornfels at the Tyrnyauz Deposit, Russia, Geol. Ore Deposits, 2016b, vol. 58, no. 5, pp. 442–446.CrossRefGoogle Scholar
  6. 6.
    Gramenitskiy, E.N. and Zinov’eva, N.G., Mineral facies of the quartz–feldspar metasomatite formation, in Metasomatizm i rudoobrazovanie (Metasomatism and Ore Formation), Moscow: Nauka, 1984, pp. 104–114.Google Scholar
  7. 7.
    Gramenitskiy, E.N., Eliseeva, N.A., and Ivanov, A.G., Zoning of skarns of the Tyrnyauz ore field, Metasomatizm i rudoobrazovanie (Metasomatism and Ore Formation), Moscow: Nauka, 1974, pp. 136–142.Google Scholar
  8. 8.
    Gramenitskiy, E.N., Aranovich, L.Ya., and Kononov, O.V., Skarns of Tyrnyauz, mineral assemblages and physicochemical conditions of formation, Vestn. Mosk. Univ., Ser. 4. Geol., 1976, no. 1, pp. 51–62.Google Scholar
  9. 9.
    Gramenitskiy, E.N., Zinov’eva, N.G., Kononov, O.V., et al., Typomorphism of plagioclaseand vertical zoning of productive metasomatites of Tyrnyauz, in Metasomatizm i rudoobrazovanie (Metasomatism and Ore Formation), Moscow: Nauka, 1978.Google Scholar
  10. 10.
    Gramenitskiy, E.N., Zinov’eva, N.G., Kononov, O.V., et al., Main features of mineralogy and zoning of post-skarn productive metasomatites of Tyrnyauza, in Ocherki fiziko-khimicheskoi petrologii (Essays on Physicochemical Petrology) Moscow, 1978, vol. 7, pp. 13–26.Google Scholar
  11. 11.
    Gramenitskiy, E.N., Shchekina, T.I., and Chekhovskikh, M.M., Experimental data on limited immiscibility and isomorphism ofscheelite–povellite series, Geokhimiya, 1980, no. 8, pp. 1158–1165.Google Scholar
  12. 12.
    Kononov, O.V., Processes of molybdenum–tungsten mineralization in the skarns of the Tyrnyauz deposit, Extended Abstract of Cand. Sci. (Geol-Min.) Dissertation, Moscow: MGU, 1963.Google Scholar
  13. 13.
    Kononov, O.V., Exsolution lamellae in molybdoscheelite, Dokl. Akad. Nauk SSSR, 1972, vol. 202, no. 5, pp. 1172–1173.Google Scholar
  14. 14.
    Kononov, O.V. and Gramenitskii, E.N., Zoning of molybdenum–tungsten mineralization of Tyrnyauz (Northern Caucasus), Geol. Rudn. Mestorozhd., 1972, vol. 14, no. 1, pp. 6–18.Google Scholar
  15. 15.
    Korzhinskiy, D.S., Essays of metasomatic processes, in Osnovnye problemy v uchenii o magmatogennykh rudnykh mestorozhdeniyakh (Main Problems in the Theory of Magmatogenic Ore Deposits), Moscow: Izd. Akademii Nauk SSSR, 1953, pp. 332–452.Google Scholar
  16. 16.
    Lyakhovich, V.V., Svyaz’ orudeneniya s magmatizmom (Tyrnyauz), (Relationship of Mineralization with Magmatism (Tyrnyauz)), Moscow: Nauka, 1976.Google Scholar
  17. 17.
    Pek, A.V., Geologicheskoe stroenie rudnogo polya mestorozhdeniya Tyrnyauz, (Geological structure of the ore field of the Tyrnyauz Deposit), Moscow: IGEM AN SSSR, 1962, issue 56.Google Scholar
  18. 18.
    Rekharskiy, V.I., On relations of molybdenite and scheellite with feldspar–quartz mineral formation stage at some skarn–rare-metal deposits, Dokl. Akad. Nauk SSSR, 1961, vol. 139, no. 4.Google Scholar
  19. 19.
    Zharikov, V.A., Quartz–feldspar metasomatites in skarn deposits, Dokl. Akad. Nauk SSSR, 1961, vol. 138, no. 3, pp. 671–673.Google Scholar

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© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  1. 1.Moscow State UniversityMoscowRussia

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