Geology of Ore Deposits

, Volume 52, Issue 8, pp 755–766 | Cite as

Nanomineralogy and nanogeochemistry of ores from gold deposits of Uzbekistan

Article

Abstract

Gold deposits of Uzbekistan are localized in the Kyzylkum, Nurata, and Kurama ore districts of the Kyzylkum-Kurama metallogenic belt. They comprise a consecutive series of deposit types corresponding to the series of geochemical associations: (Au-W)—(Au-As)—(Au-Te)—(Au-Ag)—(Au-Sb)—(Au-Hg), which are arranged as a system of zones in orebodies, deposits, ore fields, and ore districts. The distribution of chemical elements characterized by average global concentrations in the crust within the ppm-ppb (10−6-10−9 t) range was studied in ores of gold deposits using an ICP MS Elan DRC II device. Mineral nanoassemblages with a grain size of 10−6 to 10−9 m were examined with a Jeol YXA 8800R Superprobe. The Au-W, Au-As, and Au-Te associations with Bi tellurides and maldonite in ore dominate at hypo- and meso-abyssal gold deposits of the Kyzylkum district (Muruntau, Myutenbay). The contribution of the Au-Sb association with Pb, Ag, and Fe sulfoantimonites and aurostibite increases at the Daughyztau, Kokpatas, and Amantaitau gold deposits. The Au-As, Au-Te, and Au-Sb associations with Bi tellurides, maldonite, sulfoantimonites, and aurostibite dominate at the mesoabyssal gold deposits of the Nurata district (Charmitan, Guzhumsay). The Au-Te and Au-Ag associations with Au, Ag, Pb, Sb, Bi, and Hg tellurides and Bi selenides dominate at the hypabyssal gold deposits of the Kurama district (Kochbulak, Kayragach). The gold-silver deposits of the Kyzylkum district (Kosmanachi, Vysokovol’tnoe) and the Kurama district (Kyzylalmasay, Arabulak) are close in composition. They are characterized by development of intermetallides, sulfides, sulfosalts, and selenides of Au-Ag and occasionally Au-Sb associations. Fineness of gold decreases from early to late geochemical associations, whereas the size of gold grains increases in the same direction from nanogold to visible gold. The studies at the micro- and nanolevel make it possible to establish the attributes of specific gold mineralization, to substantiate prospecting guides, and to estimate the erosion level and resource potential of hidden ore objects. The greater and more diverse a set of micro- and nanominerals, the larger a gold deposit is.

Keywords

Pyrite Gold Deposit Uzbekistan Scheelite Polysulfide 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Hochella, M.F., Nanogeoscience: from Origins to Cutting-Edge Applications, Elements, 2008, vol. 4, pp. 373–379.CrossRefGoogle Scholar
  2. Hochella, M.F., There’s Plenty of Rooms at the Bottom: Nanoscience in Geochemistry, Geochim. Cosmochim. Acta, 2002, vol. 66, pp. 735–743.CrossRefGoogle Scholar
  3. Koneev, R.I., Nanomineralogiya zolota epitermal’nykh mestorozhdenii Chatkalo-Kuraminskogo regiona (Nanomineralogy of Gold at Epithermal Deposits of the Chatkal-Kurama Region), St. Petersburg: Del’ta, 2006.Google Scholar
  4. Koneev, R.I., Natural Nanotechnologies in the Mineral-Geochemical Systems, Abstracts of the 32nd IGC, Part 1, Florence, 2004.Google Scholar
  5. Koneev, R.I., Kushmuradov, A.K., and Turesebekov, A.Kh., Mikromineralogiya — predmet, metody, primenenie (Micromineralogy: Subject, Methods, and Application), Tashkent: Universitet, 1994.Google Scholar
  6. Kotov, N.V., Poritskaya, L.G., and Gembitsky, V.V., Samorodnoe zoloto mestorozhdenii Zapadnogo Uzbekistana (Native Gold at Deposits of Western Uzbekistan), St. Petersburg: Nevskii kur’er, 1995.Google Scholar
  7. Kremenetsky, A.A. and Mintser, E.F., Universality of Gold Ore Systems—A Key Criterion of Regional Forecast of Economic Mineralization, Otech. Geol., 1995, no. 1, pp. 19–27.Google Scholar
  8. Mineralogicheskaya interventsiya v mikro- i nanomir. Materialy Mezhdunarod. seminara (Proceedings of International Seminar: Mineralogical Intervention into Micro- and Nanoworld), Syktyvkar: Inst. Geol. Komi Sci. Center, 2009.Google Scholar
  9. Moiseenko, V.G., Problems of Nanogeochemistry of Gold, in Nanogeokhimiya zolota (Nanogeochemistry of Gold), Vladivostok: Dal’nauka, 2008, pp. 6–30.Google Scholar
  10. Nanogeokhimiya zolota. Trudy simpoziuma (Proceedings of Symposium on Nanogeochemistry of Gold), Vladivostok: Dal’nauka, 2008.Google Scholar
  11. Nanomineralogiya. Ul’tra- i mikrodispersnoe sostoyanie mineral’nogo veshchestva (Nanomineralogy. Ultra- and Micro-dispersion State of Mineral Substance), St. Petersburg: Nauka, 2005.Google Scholar
  12. Nanotekhnologii v blizhaishem desyatiletii. Prognoz napravleniya poiskov (red. M.K. Roko i dr.) (Vision for Nanotechnology: Research and Development in the Next Decade), Roco, M.C. and Alivisatos W.P., Eds., WTEC, Loyola College in Maryland, 1999; Moscow: Mir, 2002).Google Scholar
  13. Novgorodova, M.I., Native crystals of Native Gold and Their Intergrowths, in Novye dannye o mineralakh (New Data on Minerals), Moscow: Ekost, 2004, issue 39, pp. 83–93.Google Scholar
  14. Ovchinnikov, L.N., Ore Process, Razved. Okhr. Nedr, 1996, no. 8, pp. 27–29.Google Scholar
  15. Rudnye mestorozhdeniya Uzbekistana (Ore Deposits of Uzbekistan), Tashkent: Inst. Mineral Res., 2001.Google Scholar
  16. Rundqvist, D.V., Time Factor in the Formation of Hydrothermal Deposits: Periods, Epochs, Megastages, and Stages of Ore Formation, Geol. Rudn. Mestorozhd, 1997, vol. 39, no. 1, pp. 11–24 (Geol. Ore Deposits (Engl. Transl.), 1997, vol. 39, no. 1, pp. 8–19]).Google Scholar
  17. Spravochnik po geokhimii (Handbook on Geochemistry), Moscow: Nedra, 1990.Google Scholar
  18. Tomson, I.N., Metallogeniya rudnykh raionov (Metallogeny of Ore Districts), Moscow: Nedra, 1988.Google Scholar
  19. Vasilevsky, B.B., Koneev, R.I., Rustamov, A.I., et al., New Data on Composition of Gold Ore at the Muruntau Deposit, Rudy Met., 2004, no. 3, pp. 67–78.Google Scholar
  20. Yakubchuk, A.S., Shatov, V.V., Kirwin, D., et al., Gold and Base-Metal Metallogeny of the Central Asian Orogenic Supercollage, Econ. Geol., 2005, vol. 100. pp. 1035–1068.Google Scholar

Copyright information

© Pleiades Publishing, Ltd. 2010

Authors and Affiliations

  1. 1.VUZ-gorodokNational University of UzbekistanTashkentUzbekistan

Personalised recommendations