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Open AccessArticle

Geochemical Features and Mineral Associations of Differentiated Rocks of the Norilsk 1 Intrusion

1
VS Sobolev Institute of Geology and Mineralogy of Siberian Branch of Russian Academy of Sciences, Koptyuga Prospect., 3, 630090 Novosibirsk, Russia
2
Department of Geology and Geophysics, Novosibirsk State University, Pirogova Ave., 2, 630090 Novosibirsk, Russia
3
Institute of Mining, Geology and Geotechnology, Siberian Federal University, 95 Ave. Prospekt im. Gazety “Krasnoyarskiy Rabochiy”, 660025 Krasnoyarsk, Russia
4
Russian Platinum LLC, Sivtsev Vrahzek Side-Street, 39, 119002 Moscow, Russia
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(8), 688; https://doi.org/10.3390/min10080688
Received: 30 June 2020 / Revised: 29 July 2020 / Accepted: 30 July 2020 / Published: 31 July 2020
(This article belongs to the Special Issue The Formation of Sulfide Ores in PGE-Cu-Ni Deposits)
The purpose of this study is to show the patterns of distribution of disseminated sulfide in layered rocks based on the numerous geochemical and mineralogical data obtained for eight boreholes of the Norilsk intrusion (southern part of the Norilsk 1 deposit). There is a common trend of sulfide liquid fractionation in the Main Ore Horizon, which is composed of picritic and taxite (or olivine) gabbro-dolerites: the Ni/Cu in both rock types decreases down all sections, indicating an increase in the degree of fractionation of the sulfide liquid from top to bottom. On the contrary, the Ni/Fe ratios in pentlandite increase in this direction due to an increase in sulfur fugacity. However, picrite and taxite/olivine gabbro-dolerites are very distinctly separated by Ni/Cu values: these values are >1 in picritic gabbro-dolerite while they are always <1 in taxite/olivine gabbro-dolerite. These rock types are distinguished by sulfide assemblages. The first includes troilite, Fe-rich pentlandite, chalcopyrite, cubanite, talnahite, bornite and copper (low sulfur association); the second one is composed of monoclinic pyrrhotite, chalcopyrite, Ni-rich pentlandite and pyrite (high sulfur association). A two-stage magma injection with different ore specializations is supposed for picritic and taxite/olivine gabbro-dolerites. View Full-Text
Keywords: Norilsk 1 intrusion; platinum–copper–nickel deposits; disseminated ores; mineralogy and geochemical features Norilsk 1 intrusion; platinum–copper–nickel deposits; disseminated ores; mineralogy and geochemical features
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MDPI and ACS Style

Tolstykh, N.; Shvedov, G.; Polonyankin, A.; Korolyuk, V. Geochemical Features and Mineral Associations of Differentiated Rocks of the Norilsk 1 Intrusion. Minerals 2020, 10, 688. https://doi.org/10.3390/min10080688

AMA Style

Tolstykh N, Shvedov G, Polonyankin A, Korolyuk V. Geochemical Features and Mineral Associations of Differentiated Rocks of the Norilsk 1 Intrusion. Minerals. 2020; 10(8):688. https://doi.org/10.3390/min10080688

Chicago/Turabian Style

Tolstykh, Nadezhda; Shvedov, Gennadiy; Polonyankin, Aleksandr; Korolyuk, Vladimir. 2020. "Geochemical Features and Mineral Associations of Differentiated Rocks of the Norilsk 1 Intrusion" Minerals 10, no. 8: 688. https://doi.org/10.3390/min10080688

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