Geologicheskii Vestnik

Hypergenе sulfate minerals are described, which together with muscovite-2 form thin outgrowths on the surface of quartz and muscovite-1, which in turn develop on crystals of predominantly cubic pyrite selected from disintegrated “washout shales” in the brown ironstone Petlinо quarry in the Southern Urals. The studies were carried out using X-ray phase analysis and energy dispersive microanalysis. Small secretions of Sr-containing barite are associated with pyrite, quartz and muscovite-1. Pyrite is characterized by a constant small impurity of Co and Ni up to 0.16–0.23 wt. %, occasionally Cu and Pb. On the periphery, accretions with chalcopyrite are often noted in it. It was found that among the aqueous sulfate minerals in the samples, ferricopiapite with an admixture of Al is most developed. This mineral occurs in the form of rounded and oval “brushes” measuring 0.01–0.3 mm in association with hexahydrite and gypsum. The latest hypergenic sulfate is bledite, which forms microtables of about 5 microns in size on ferricopiapite. The presence of pickeringite, alunogen and some other aqueous sulfate minerals is assumed. Ferricopiapite is described for the first time for the Bakal iron ore region. The conducted studies on sulfates formed on the surface of pyrite from the Petlinо quarry confirm and supplement previously obtained information on technogenic hypergenе sulfate mineralization in quarries and dumps of Bakal deposits and can be used for their geoecologic assessment.

aqueous sulfate minerals, ferricopiapite, bledite, Petlinо quarry, Bakal iron ore district, Southern Urals

• Belogub E.V. (2009) Gipergenez sul’fidnykh mestorozhdenii Yuzhnogo Urala [Hypergenesis of sulfide deposits in the Southern Urals] / Avtoref… dis. dokt. geol.-min. nauk. Sankt-Peterburg. 40 p. (In Russian).
• Blinov I.A. (2016) Gipergennye mineraly tsinka na sul’fidnykh mestorozhdeniyakh Yuzhnogo Urala [Hypergenic zinc minerals in the sulfide deposits of the Southern Urals] / Avtoref… dis. kand. geol.-min. nauk. Sankt-Peterburg. 23 p. (In Russian).
• Drits V.A., Kossovskaya A.G. (1991) Glinistye mineraly: slyudy, khlority [Clay minerals: micas, chlorites]. Nauka Publ., Moscow, Russia. 176 p. (In Russian).
• Zhukhlistov A.P., Zvyagin B.B., Shuriga T.N. (1983) Electronographic study of the crystal structure of di-trioctahedral Li, Fe-phengite 1M. Elektronograficheskoe issledovanie kristallicheskoi struktury di-trioktaedricheskogo Li, Fe-fengita 1M [Electronographic study of the crystal structure
  of di-trioctahedral Li, Fe-phengite 1M]. Kristallografiya. 28 (5), 874−879. (In Russian).
• Zaraiskii G.P. (2007) Eksperiment v reshenii problem metasomatizma [An experiment in solving the problems of metasomatism]. GEOS Publ., Moscow, Russia. 136 p. (In Russian).
• Kashkai M.A., Aliev R.M. (1960) A new mineral calcioсopiapite (tusiite) from the copiapite group and about the characteristics of this group in general [Novyi mineral kal’tsiokopiapit (tusiit) iz gruppy kopiapita i o kharakteristike etoi gruppy voobshche]. Tr. Azerbaidzh. geogr. obshch.
  49–76. (In Russian).
• Krupenin M.T., Michurin S.V. (2011) Isotopic and geochemical characteristics of sulfides from the magnesite deposits of the Southern Urals province [Izotopno-geokhimicheskie kharakteristiki sul’fidov iz magnezitovykh mestorozhdenii Yuzhno-Ural’skoi provintsii]. Geologiya. Izvestiya Otdeleniya nauk o Zemle i prirodnykh resursov AN RB. (16), 64–80. (In Russian).
• Krupenin M.T., Shardakova G.YU., Kuznetsov A.B. (2007) O geokhimii protsessov formirovaniya «slantsev peremyva» i listvenitov po porodam Glavnoi daiki (Bakal’skii raion) [On the geochemistry of the processes of formation of «washout shales» and listvenites by rocks of the Main dyke (Bakalsky district)] // Geodinamika, magmatizm, sedimentogenez i minerageniya Severo-Zapada Rossii / Materialy Vserossiiskoi konferentsii, Petrozavodsk, 12–15 noyabrya 2007. Petrozavodsk: Institut geologii KaRNTS RAN, 199–203. (In Russian).
• Michurina V.S., Michurin S.V. (2024) Gipergennaya sul’fatnaya mineralizatsiya Petlinskogo burozheleznyakovogo kar’era (Yuzhnyi Ural) [Hypergenic sulfate mineralization of the Petlinsk brown limestone quarry (Southern Urals)] // Mineraly i mineraloobrazovanie v prirodnykh i tekhnogennykh protsessakh / Materialy Vserossiiskoi nauchnoi geologicheskoi konferentsii, posvyashchennoi 55-letiyu Bashkirskogo otdeleniya RMO. (In Press). (In Russian).
• Ogorodnikov V.N., Babenko V.V., Polenov YU.A., Savichev A.N. (2015) Genetic types of muscovites from the gold ore and crystal bearing deposits of the Urals [Geneticheskie tipy muskovitov zolotorudnykh i khrustalenosnykh mestorozhdenii Urala]. Litosfera. (5), 90–98. (In Russian).
• Ogorodova L.P., Gritsenko YU.D., Vigasina M.F., Kosova D.A., Mel’chakova L.V., Ksenofontov D.A., Dedushenko S.K. (2021) Physico-chemical and calorimetric study of aluminocopiapite and thermodynamic properties of minerals of the copiapite group [Fiziko-khimicheskoe i kalorimetricheskoe izuchenie alyuminokopiapita i termodinamicheskie svoistva mineralov kopiapitovoi gruppy]. Geokhimiya. 66 (3), 281–288. (In Russian).
• Samigullin A.A., Michurin S. V. (2024) The first data on the hypergenic mineralization of black shales of the Kagarmanovo Zigazino-Komarovо formation of the Middle Riphean (Southern Urals) [Pervye dannye po gipergennoi mineralizatsii chernykh slantsev razreza Kagarmanovo zigazino-komarovskoi svity srednego rifeya (Yuzhnyi Ural)]. Geologicheskii vestnik. (2), 117–129.
• Sergeev O.P. (1963) Stratigrafiya bakal’skoi svity Ural’skogo proterozoya [Stratigraphy of the Bakal formation of the Ural Proterozoic] / Materialy po regional’noi stratigrafii
  SSSR. Moskva: Gosgeoltekhizdat, 45–54. (In Russian).
• Tipomorfizm mineralov: Spravochnik [Typomorphism of minerals: A reference book]. (1989) Pod red. L.V. Chernyshevoi. Nedra Publ. Moscow, Russia. 560 p. (In Russian).
• Filippova K.A. (2004) Geokhimiya protsessov tekhnogeneza Bakal’skikh zhelezorudnykh mestorozhdenii (Yuzhnyi Ural) [Geochemistry of the processes of technogenesis of the Bakal iron ore deposits (Southern Urals)] / Avtoref… dis. kand. geol.-min. nauk. EkaterinburgThe Zavaritsky Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences. 24 p. (In Russian).
• Khlybov V.V., Simakina YU.S. (2005) Hypergenic sulfate mineralization on the Kellovian clays of the Ukhtym River (Western Pritiman) [Gipergennaya sul’fatnaya mineralizatsiya na kelloveiskikh glinakh reki Ukhtym (Zapadnoe Pritiman’e)]. Vestnik of the Institute of Geology of the Komi Science Center of the Ural Branch of the Russian Academy of Sciences. (6), 6–11. (In Russian).
• Epova E.S., Rusal’ O.S., Eremin O.V. (2018) Rare earth elements in the hypergenesis zone of the Sherlovogorsk tin-polymetallic deposit (Zabaikal region) [Redkozemel’nye elementy v zone gipergeneza Sherlovogorskogo olovo-polimetallicheskogo mestorozhdeniya (Zabaikal’skii krai)]. Izvestiya Tomskogo politekhnicheskogo universiteta. Inzhiniring georesursov. 329 (8), 88–95. (In Russian).
• Fanfani L., Nunzi A., Zanazzi P.F., Zanzari A.R. (1973) The copiapite problem: the crystal structure of a ferrian copiapite. American Mineralogist. 58, 314–322.
• Guven N. (1971) The crystal structures of 2M1 phengite and 2M1 muscovite. Zeitschrift fur Kristallographie. 134, 196–212.
• Haidinger W. (1845) Handbuch der bestimmenden Mineralogie, enthaltend die Terminologie, Systematik, Nomenklatur und Charakteristik der Naturgeschichte des Mineralreiches. Wien, Braumüller & Seidel. 630 p.
• Hawthorne F.C., Krivovichev S.V., Burns P.C. (2000) The Crystal Chemistry of Sulfate Minerals. Sulfate minerals: crystallography, geochemistry, and environmental significance. Reviews in Mineralogy and Geochemistry, 40, 608 p.
• Hill R.J. (1977) A further refinement of the barite structure. The Canadian Mineralogist, 15 (4), 522–526.
• Majzlan J., Michallik R. (2007) The crystal structures, solid solutions and infrared spectra of copiapite-group minerals. Mineralogical Magazine, 71 (5), 553–569.
• Pederson B.F., Semmingsen D. (1982) Neutron Diffraction Refinement of the Structure of Gypsum, CaSO4×2H2O. Acta Crystallographica, 38, 1074–1077.
• Rose G. (1833) Über einige in Südamerica vorkommende Eisenoxydsaize. Annalen der Physik, 27, 309–319.
• Schroll E. (1976) Analytische geochemie. Band II: Grundlagen und Anwendungen. Stuttgart: Enke. 311 p.
• Susse P. (1972) Crystal structure and hydrogen bonding of copiapite. Zeitschrift fur Kristallographie, 135, 34–55.
• Wyckoff R.W. G. (1963) Crystal Structures. Vol.1. New
  York: Interscience Publishers. 467 p.
• Zalkin A., Ruben H., Templeton D.H. (1964) The crystal structure and hydrogen bonding of magnesium sulfate hexahydrate. Acta Crystallographica. 17, 235–240.
• Zodrow E.L. (1980) Hydrated sulfates from Sydney Coalfield, Cape Breton Island, Nova Scotia, Canada: the copiapite group. American Mineralogist. 65 (9–10), 961–967.