Native bismuth,tsumoite, and Pb-bearing tsumoite from the Tarn’er copper-zinc massive sulfide deposit,northern Urals |
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| Authors: | E V Belogub V P Moloshag K A Novoselov V A Kotlyarov |
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| Institution: | 1.Institute of Mineralogy, Ural Branch,Russian Academy of Sciences,Miass, Chelyabinsk oblast,Russia;2.Institute of Geology and Geochemistry, Ural Branch,Russian Academy of Sciences,Yekaterinburg,Russia |
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| Abstract: | Bismuth mineralization, including native bismuth, tsumoite (Bi1.99–2.03Te2.00), and Pb-bearing tsumoite (Bi1.56–1.88Pb0.45–0.14)2.00–2.03Te2.00, was identified in the Au-enriched disseminated ore at the Tarn’er massive sulfide deposit formed under the effect of a large
diorite intrusion. Native bismuth associated with hessite forms idiomorphic inclusions in chalcopyrite. The assemblage of
Pb-bearing tsumoite, hessite, and altaite occurs as angular allotriomorphic-granular inclusions in silicates or at the contact
between silicate and sulfide aggregates. Tsumoite in allotriomorphic-granular aggregates with galena, hessite, and sphalerite
is devoid of lead. Gold (Au0.65Ag0.35) was identified along with bismuth tellurides. The temperature of contact methamorphism (500–800°C) was estimated from the
stability of andalusite, sillimanite, and cordierite. The morphology of the bismuth telluride aggregates in silicates and
graphic intergrowth of tsumoite with galena suggest possible crystallization from anatectic melt. The positive correlation
between Bi, Te, and Au confirms their probable joint transportation in the melt. |
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