Hibbingite and its manganoan variety from metamorphosed pentlandite-putoranite ores of the Oktyabrskoye deposit

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Marco E. Ciriotti
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Hibbingite and its manganoan variety from metamorphosed pentlandite-putoranite ores of the Oktyabrskoye deposit

Messaggio da Marco E. Ciriotti » sab 10 apr, 2021 14:40

Referenza:
▪ Spiridonov, E.M., Belyakov, S.N., Ivanova, Yu.A., Egorov, K.V., Korotaeva, N.N., Naumov, D.I., Yapaskurt, O.V. (2020): Hibbingite and its manganoan variety from metamorphosed pentlandite-putoranite ores at deep levels of the Oktyabrskoye deposit, Norilsk ore field. Zapiski RMO (Proceedings of the Russian Mineralogical Society), 149(1), 32-42.

Abstract:
Hibbingite and its manganoan variety, (Fe2+,Mn2+)2(OH)3Cl, and siderite, including its manganoan variety, (Fe2+,Mn2+)[CO3], replacing magnetite and associated sulphides, occur in tectonized and metamorphosed pentlandite-putoranite ores at deep levels of the Oktyabrskoye deposit belonging to the Norilsk ore field (Siberia). Hibbingite aggregates are formed by lamellar crystals. Hibbingite contains 2–38 mol. % of the kempite component. Hibbingite with 7–13% of the kempite component is common. Hibbingite replacing magnetite and putoranite, is enriched in copper: up to 2.6 wt % Cu that corresponds to 4 mol. % of the atacamite component. Hibbingite replacing magnetite and pentlandite contains up to 1.5 wt % Ni. In zonal siderite crystals cores are composed of low-impurity siderite, whereas rim is enriched in Mn (up to 23 mol. % of the rhodochrosite end member) and Cu (up to 4.5 wt % CuO). Pure native silver and cadmium-enriched sphalerite are associated with hibbingite and siderite. These are low-temperature metamorphogenic-hydrothermal mineralizations developed under the conditions of zeolite facies. The replacing of magnetite for hibbingite and siderite is a reduction process that apparently took place under acidic–carbon dioxide conditions with the participation of hydrocarbons or hydrogen. The probable reaction is: Fe2+Fe3+2O4+ HCl + СО2 + H2 → Fe2+2(OH)3Cl+ Fe2+[CO3].
Marco E. Ciriotti

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