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Ore Mineralization in Ultramafic and Metasomatic Rocks of the Ospin–Kitoi Massif, Eastern Sayan

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Abstract

In the Ospin–Kitoi ultramafic massif of the Eastern Sayan, accessory and ore Cr-spinel are mainly represented by alumochromite and chromite. Copper–nickel mineralization hosted in serpentinized ultramafic rocks occurs as separate grains of pentlandite and pyrrhotite, as well as assemblages of (i) hexagonal pyrrhotite + pentlandite + chalcopyrite and (ii) monoclinal pyrrhotite + pentlandite + chalcopyrite. Copper mineralization in rodingite is presented by bornite, chalcopyrite, and covellite. Talc–breunnerite–quartz and muscovite–breunnerite–quartz listvenite contains abundant sulfide and sulfoarsenide mineralization: pyrite, gersdorffite, sphalerite, Ag–Bi and Bi-galena, millerite, and kuestelite. Noble metal mineralization is represented by Ru–Ir–Os alloy, sulfides, and sulfoarsenides of these metals, Au–Cu–Ag alloys in chromitite, laurite intergrowth, an unnamed mineral with a composition of Cu3Pt, orcelite in carbonized serpentinite, and sperrylite and electrum in serpentinite. Sulfide mineralization formed at the late magmatic stage of the origination of intrusion and due to fluid–metamorphic and retrograde metasomatism of primary rocks.

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Authors and Affiliations

  1. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, Moscow, 119017, Russia

    A. V. Grigor’eva & S. F. Sluzhenikin

  2. Geological Institute, Siberian Branch, Russian Academy of Sciences, Ulan-Ude, 6700047, Russia

    B. B. Damdinov

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  1. A. V. Grigor’eva
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  2. B. B. Damdinov
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  3. S. F. Sluzhenikin
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Correspondence to A. V. Grigor’eva.

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Original Russian Text © A.V. Grigor’eva, B.B. Damdinov, S.F. Sluzhenikin, 2018, published in Geologiya Rudnykh Mestorozhdenii, 2018, Vol. 60, No. 2, pp. 141–163.

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Grigor’eva, A.V., Damdinov, B.B. & Sluzhenikin, S.F. Ore Mineralization in Ultramafic and Metasomatic Rocks of the Ospin–Kitoi Massif, Eastern Sayan. Geol. Ore Deposits 60, 121–141 (2018). https://doi.org/10.1134/S1075701518020022

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