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Arsenocolusite in Pyrite Ores of the Saum Copper–Zinc Massive Sulfide Deposit, North Urals

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Abstract—

Pyrite ores on the flanks of the Saum copper–zinc massive sulfide deposit are clastic sediments intensely transformed under conditions of acid diagenesis. Colusite in ores is confined to fine-grained pyrite clasts, which are rimmed by later small-crystalline pyrite aggregates. Colusite forms fine dissemination (1–3 µm) and large isometric grains (up to 50–100 µm), contains inclusions of sulvanite, and belongs to arsenocolusite in chemical compositions (wt %): 12.62–14.87 As, 0.19–0.64 Sb, 0.29–1.46 Sn, 3.05–3.23 V, and 1.51–3.20 Fe. The LA ICP MS analysis of fine-grained pyrite revealed minor Ga, Ge, In, and Se contents in composition of arsenocolusite, which are correlated with chemical elements of colusite according to isomorphous substitutions in its formula. Galena, tellurobismuthite, native gold, molybdenite, rutile, monazite, uraninite, and Ba-bearing muscovite are found in fine-grained pyrite in assemblage with colusite. Interaction of sulfide sediments with seawater led to their enrichment in seawater elements (V, Mo, and U) and the deposition of colusite in assemblage with molybdenite and uraninite from trace element-rich diagenetic fluids under their dehydration.

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Funding

The study was supported by state contract no. АААА-А19-119061790049-3 of the Institute of Mineralogy of the South Ural Federal Science Center of Mineralogy and Geoecology, Ural Branch, Russian Academy of Sciences.

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Authors and Affiliations

  1. South Urals Federal Science Center of Mineralogy and Geoecology, Ural Branch, Russian Academy of Sciences, 456317, Miass, Chelyabinsk oblast, Russia

    N. R. Ayupova, V. V. Maslennikov, A. S. Tseluyko, D. A. Artemyev, E. V. Belogub & V. A. Kotlyarov

  2. Ural Branch, JSC Polimetall UK, 620100, Yekaterinburg, Sverdlovsk oblast, Russia

    A. V. Stepanov & A. V. Butnyakov

Authors
  1. N. R. Ayupova
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  2. V. V. Maslennikov
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  3. A. S. Tseluyko
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  4. A. V. Stepanov
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  5. D. A. Artemyev
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  6. E. V. Belogub
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  7. V. A. Kotlyarov
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  8. A. V. Butnyakov
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Correspondence to N. R. Ayupova.

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Translated by I. Melekestseva

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Ayupova, N.R., Maslennikov, V.V., Tseluyko, A.S. et al. Arsenocolusite in Pyrite Ores of the Saum Copper–Zinc Massive Sulfide Deposit, North Urals. Geol. Ore Deposits 63, 79–86 (2021). https://doi.org/10.1134/S1075701521010037

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  • DOI: https://doi.org/10.1134/S1075701521010037

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