Mineralogy of noble metals (Au, Ag, Pd, Pt) in Volkovskoe Cu-Fe-Ti-V deposit (Middle Urals, Russia)
https://doi.org/10.24930/1681-9004-2021-21-5-643-659
Abstract
Research subject. The mineral compositions of titanomagnetitic (apatite, titanomagnetite) and copper-titanomagnetitic (bornite, chalcopyrite, apatite, titanomagnetite) ores of the Volkovskoe Cu-Fe-Ti-V deposit (Middle Urals, Russia).
Methods. The research was carried out using a Jeol JSM-6390LV scanning electron microscope and X-ray spectral microanalyzers JXA-5 (Jeol) at the Geoanalitik Collective Use Center of the IGG UB RAS. Results and conclusions.
Native gold (with ≤ 0.3 wt % Pd, 0.2–0.4 wt % Cu; fneness 800–914 ‰), tellurides of Pd, Au and Ag (merenskyite, keithconnite, sylvanite, hessite) and Pt arsenide (sperrylite) were found in the copper-titanomagnetitic ores. For the frst time, two generations of native gold (fneness 1000 and 850–860 ‰) and palladium telluride (keithconnite Pd3-xTe) were detected in titanomagnetitic ores. The sequence of ore mineral formation and the features of their genesis were revealed. Native gold (fneness 1000‰) in the form of microinclusions in titanomagnetite was attributed to the magmatic stage. Noble metal minerals, intergrown with copper sulfdes (bornite, chalcopyrite, digenite) and associated with late hydroxyl-bearing minerals (amphibole, epidote, chlorite), are superimposed in relation to the magmatic minerals (pyroxene, plagioclase, hornblende, apatite, titanomagnetite, ilmenite, etc.) of these ores. Merenskyite, sperrylite, high fneness gold (800–914 ‰), as well as carrolite, cobaltite, copper-cobalt telluride and bismuth tellurium-selenide kawazulite Вi2Te2Se are syngenetic with copper sulfdes. The Au-Ag tellurides were deposited later than these minerals. It is shown that the high fugacity of tellurium, which binds Pd, Au, and Ag into tellurides, prevents the occurrence of native gold containing high concentrations of palladium and silver.
Supporting agencies: The research was fnancially supported by the RFBR (project No. 20-05-00393а) and within the frame of the state program of IGG uB RAS (state registration No. АААА-А18-118052590028-9) and IGM SB RAS (No. 0330-2016-0001) using the “Geoanalitik“ shared research facilities of the IGG uB RAS. The re-equipment and comprehensive development of the “Geoanalitik” shared research facilities of the IGG uB RAS is fnancially supported by the grant of the Ministry of Science and higher Education of the Russian Federation (Agreement No. 075-15-2021-680)
About the Authors
V. V. Murzin
A.N. Zavaritsky Institute of Geology and Geochemistry uB RAS
Russian Federation
Russian Federation
15 Akad. Vonsovsky st., Ekaterinburg 620110
G. A. Palyanova
V.S. Sobolev Institute of Geology and Mineralogy, SB of RAS; Department of Geology and Geophysics, Novosibirsk State university
Russian Federation
Russian Federation
3 Akad. Koptyug pr., Novosibirsk 630090
Pirogov st., Novosibirsk 630090
E. V. Anikina
A.N. Zavaritsky Institute of Geology and Geochemistry uB RAS
Russian Federation
Russian Federation
15 Akad. Vonsovsky st., Ekaterinburg 620110
V. P. Moloshag
A.N. Zavaritsky Institute of Geology and Geochemistry uB RAS
Russian Federation
Russian Federation
15 Akad. Vonsovsky st., Ekaterinburg 620110
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Review
For citations:
Murzin V.V., Palyanova G.A., Anikina E.V., Moloshag V.P. Mineralogy of noble metals (Au, Ag, Pd, Pt) in Volkovskoe Cu-Fe-Ti-V deposit (Middle Urals, Russia). LITHOSPHERE (Russia). 2021;21(5):653-659. (In Russ.) https://doi.org/10.24930/1681-9004-2021-21-5-643-659
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