Geologicheskii Vestnik

The article considers the Golenkie Gorki gold ore occurrence, which is part of the Siratur ore field. It is located in the northern part of the South Ural segment of the Main Ural Fault, in the junction zone of the Bashkir meganticlinorium with the northern closure of the Magnitogorsk megazone. Carbonaceous and carbonaceous-chlorite-quartz shales have areal distribution, form independent packs and have a predominantly granoblastic structure and a massive, rarely spotted texture. The results of thermal analysisshow the temperature of the onset of the exothermic effect of carbon in the range of 500–640°С, which correspondsto the high-temperature subfacies ofthe greenschistfacies ofregional metamorphism. The average content of Corg is about 2.4 %, which makes it possible to attribute these rocks to the carbonaceous type. It is shown that gold ore mineralization is confined to the contact zone of a rather thick sequence of carbonaceous shales of the Polyakovka Formation with serpentinites of the Nurali gabbro-ultramafic massif. A zone of listwanites 1400 m long and up to 30 m wide was established within the contact. Testing of all types of rocks for gold revealed its increased content in ferruginous and silicified carbonaceouschlorite-quartz schists and veined quartz, as well as near-ore values in silicified listwanites. The analysis of gold grains made it possible to refer them to the low-quality type. Significant silver impurities indicate the gold-sulfide type of mineralization. Along the periphery of the grains, the purification of gold grains from impurity elements in the hypergenesis zone was noted.

the Southern Urals, Main Ural fault, Magnitogorsk megasynclinorium, Nurali massif, Golenkie Gorki, Siratur deposit, Polyakovka Formation, gold, silver, sulfides, ophiolite association, carbonaceous schists, ultramafic rocks, listwanites

• Aulov B.N., Vladimirtseva Yu.A., Gvozdik N.I., Korolkova Z.G., Levin F.D., Lipaeva A.V., Potashova M.N., Samozvantsev V.A. Gosudarstvennaya geologicheskaya karta Rossiyskoy Federatsii. Masshtab 1:200 000. Izdaniye vtoroye. Seriya Yuzhnoural’skaya. List N-40‑XII (Zlatoust).
• Ob’yasnitel’naya zapiska [State geological map of the Russian Federation. Scale 1:200.000. Second edition. Series Yuzhnouralskaya. Sheet N-40‑XII]. Ob’yasnitel’naya zapiska. Moscow: VSEGEI, 2015. 365 р. (In Russian).
• Chukhareva N.S., Belogub Ye.V., Ryzhkova YU. A., Blinov I.A., Rassomakhin M.A., Novoselov K.A. Osobennosti morfologii i khimicheskogo sostava samorodnogo zolota mestorozhdeniya Murtykty (Yuzhnyy Ural) [Features of the morphology and chemical composition of native gold from the Murtykty deposit(Southern Urals)]// Mineralogy. 2021. No. 7. Vol. 1. Р. 54–65. (In Russian). DOI: 10.35597 / 2313-545X-2021‑7‑1‑4
• Honigman B. Rost i forma kristalla [Growth and shape of the crystal]. Moscow: Foreign Literature Publishing House, 1961. 224 p. (In Russian).
• Ivanova V.P., Kasatov B.K., Krasavkina T.N., Rozinova E.L. Termicheskiy analiz mineralov i gornykh
  porod [Thermal analysis of minerals and rocks]. Leningrad: Nedra, 1974. 399 р. (In Russian).
• Knyazev Yu.G., Knyazeva O.Yu., Snachev V.I., Zhdanov A.V., Karimov T.R., Aidarov E.M., Masagutov R.Kh., Arslanova E.R. Gosudarstvennaya geologicheskaya karta Rossiyskoy Federatsii. Masshtab 1:1000 000 (3‑ye pokoleniye). Seriya Ural’skaya. List N-40 (Ufa) [State geological map of the Russian Federation. Scale 1:1000.000 (3rd generation). Ural series. Sheet N-40].
• Ob’yasnitel’naya zapiska. SanktPeterburg: VSEGEI, 2013. 512 p. (In Russian).
• Krasnobayev A.A., Valizer P.M., Perchuk A.L. Ordovikskiy vozrast dunit-verlit-klinopiroksenitovogo poloschatogo kompleksa massiva Nurali (Yuzhnyy Ural, Rossiya) po dannym SHRIMP U-Pb datirovaniya tsirkonov [Ordovician age of the dunite-wehrlite-clinopyroxenite banded complex of the Nurali massif (South Ural, Russia) according to SHRIMP U-Pb zircon dating] // Bulletin of Moscow University. Series 4. Geology, 2018, No 1. P. 60–70. (In Russian).
• Maslov V.A., Artyushkova O.V. Stratigrafiya paleozoyskikh obrazovaniy Uchalinskogo rayona Bashkirii [Stratigraphy of the Paleozoic formations of the Uchalinsky district of Bashkiria]. Ufa: IG UfNTS RAN, 2000. 140 р. (In Russian).
• Murzin V.V., Malyugin A.A. Tipomorfizm zolota zony gipergeneza (na primere Urala) [Typomorphism of gold in the hypergenesis zone (on the example of the Urals)]. Sverdlovsk: UNTS AN SSSR, 1987. 96 р. (In Russian).
• Petrovskaya N.V. Samorodnoye zoloto [Native gold]. Moscow: Nauka, 1973. 377 p. (In Russian).
• Salikhov D.N., Kovalev S.G., Belikova G.I., Berdnikov P.G. Poleznyye iskopayemyye Respubliki Bashkortostan (zoloto), Chast’ 1 [Minerals of the Republic of Bashkortostan (gold), Part 1.]. Ufa: Ecology, 2003. 222 р. (In Russian).
• Salikhov D.N., Rakhimov I.R., Moseychuk V.M. Kamennougol’nyy magmatizm kollizionnoy epokhi na Yuzhnom Urale [Carboniferous magmatism of the collisional epoch in the Southern Urals] // Geological collection No. 10. Ufa: DesignPolygraphService, 2013. Р. 176–199. (In Russian).
• Sazonov V.N., Ogorodnikov V.N., Koroteyev V.A., Polenov YU.A. Mestorozhdeniya zolota Urala [Ural gold deposits]. Yekaterinburg: UGGGA, 1999, 570 р. (In Russian).
• Seravkin I.B., Znamenskiy S.Ye., Kosarev A.M. Razryvnaya tektonika i rudonosnost’ Bashkirskogo Zaural’ya [Fault tectonics and ore content of the Bashkir Trans-Urals]. Ufa: Polygraph Combine, 2001. 318 р. (In Russian).
• Snachev A.V. Geology and conditions of accumulation of carbonaceous deposits of the Siratursky ore field [Geologiya i usloviya nakopleniya uglerodistykh otlozheniy Siraturskogo rudnogo polya] // Bulletin of the Academy of Sciences of the Republic of Bashkortostan. 2019. Vol. 32. No. 3. Р. 15–25. (In Russian). DOI: 10.24411 / 1728‑5283‑2019‑10302
• Snachev A.V. Kuznetsov N.S., Snachev V.I. Chernoozorskoye proyavleniya zolota — pervyy ob’yekt na Yuzhnom Urale v uglerodistykh otlozheniyakh ofiolitovoy assotsiatsii [Chernoozerskoe occurrence of gold — the first object in the Southern Urals in the carbonaceous deposits of the ophiolite association] // Doklady Earth Sciences. 2011. Vol. 439. No. 1. Р. 83–85. (In Russian).
• Snachev A.V., Latypov F.F., Snachev V.I., Rassomahin M.A., Koshchug D.G., Vyatkin S.V. Siraturskoye mestorozhdeniye zolota v uglerodistykh otlozheniyakh ofiolitovoy assotsiatsii (Yuzhnyy Ural) [Siraturskoe gold deposit in carbonaceous deposits of ophiolite association (Southern Urals)] // Bulletin of Moscow University, Series 4: Geology. 2020. No. 5. Р. 64–70. (In Russian). DOI: 10.33623/0579‑9406‑2020‑5‑64‑70
• Tyurin A.M., Kolomoets A.V., Snachev A.V., Smoleva I.V., Pankrat’ev P.V. Carbonaceous deposits(carboniferous) and oil and gas potential prospects of the Magnitogorsk trough (South Urals) // Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki., 2021, V. 163. №3. P. 466–476. DOI: 10.26907 / 2542-064X. 2021.3.466–476
• Yudovich Yа.E., Ketris M.P. Geokhimiya chernykh slantsev [Geochemistry of black shales]. Moscow — Berlin: Direct-Media, 2015. 272 р. (In Russian). DOI: 10.23681 / 428042
• Znamensky S.E., Ankusheva N.N., Snachev A.V. Usloviya formirovaniya i istochniki rudoobrazuyushchikh flyuidov Nikolayevskogo mestorozhdeniya zolota (Yuzhnyy Ural) [Formation conditions and sources of ore-forming fluids of the Nikolaev gold deposit (Southern Urals)] // Geologiya i geofizika, 2020, Vol. 61, No 8. P. 1019–1030. (In Russian). DOI: 10.15372 / GiG2019173
• Znamensky S.E., Znamenskaya N.M. Voznesenskoye zolotorudnoye mestorozhdeniye (Yuzhnyy Ural): geologicheskoye stroyeniye, geokhimiya rudovmeshchayushchikh porod, geodinamicheskiye usloviya obrazovaniya [Voznesenskoye gold deposit (Southern Urals): geological structure, geochemistry of ore-bearing rocks, geodynamic conditions of formation] // Litosfera, 2009, Vol. 22. No. 3. P. 391–403. (In Russian). DOI: 10.24930 / 1681‑9004‑2022‑22‑3‑391‑403