Abstract
Rocks enriched in olivine, such as olivine and picritic gabbro–dolerite and troctolite are abundant in the Pyasino–Vologochan intrusion. In contrast to Norilsk type ore-bearing massifs, ultramafic rocks of the intrusion are dominated by troctolite. Picritic gabbro–dolerite and troctolite are located between olivine and olivine-bearing gabbro–dolerite. These rocks are related by gradual transitions. The rocks are enriched in olivine, but depleted in magnesium relative to the Norilsk type ore-bearing massifs. The intrusion is also distinguished by low chromium content in the rocks. Most disseminated Pt–Cu–Ni ores are confined to troctolite and picritic gabbro–dolerite, and to a lesser extent, to contact and olivine gabbro–dolerite. The ore is mainly observed as low-sulfur assemblages of sulfides with troilite, Fe-rich hexagonal pyrrhotite, Fe-rich chalcopyrite, talnakhite, Fe-rich pentlandite, and cubanite. The total content of platinum group elements (PGE) in the ore (ppm) is as follows: from 0.45–3.47 to 7.8; gold, from 0.05–0.24 to 0.49; and silver, from 0.53–4.50 to 8.30. Disseminated ores of the Pyasino–Vologochan intrusion contain the following Pt and Pd minerals: sobolevskite, Te-sobolevskite, Te-insizwaite, maslovite, paolovite, zvyagintsevite, atokite, niggliite, mertieite II, guanglinite, and Pd2(As,Sb), Pd2(Sn,As), Pd3Sb, (Pd,Ni)2As minerals. The similarities and differences between the Pyasino–Vologochan intrusion and Norilsk type ore-bearing massifs are discussed in this paper.
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Original Russian Text © S.F. Sluzhenikin, N.A. Krivolutskaya, 2015, published in Geologiya Rudnykh Mestorozhdenii, 2015, Vol. 57, No. 5, pp. 424–444.
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Sluzhenikin, S.F., Krivolutskaya, N.A. Pyasino–Vologochan intrusion: Geological structure and platinum–copper–nickel ores (Norilsk Region). Geol. Ore Deposits 57, 381–401 (2015). https://doi.org/10.1134/S1075701515050050
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DOI: https://doi.org/10.1134/S1075701515050050