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Chemical composition of platinum-group minerals from the Bor-Uryakh massif (Maimecha-Kotui Province, Russia)

Abstract

This contribution firstly presents particularities of mineral chemistry of platinum-group elements (PGE) mineralization from placer deposits linked to the Bor-Uryakh massif of the Maimecha-Kotui Province, northern part of the Siberian Craton. The chemical composition of PGE mineralization has been studied by electron microprobe analysis. At Bor-Uryakh, main platinum-group minerals (PGM) comprise Os-Ir and Pt-Fe alloys represented by individual crystals, and polyphase PGM assemblages. The majority (e.g., 12 out of 19) of the Os-rich nuggets are iridian osmium, with subordinate amounts of native osmium (Os) and chengdeite (Ir3Fe). Pt-Fe alloys have a stoichiometric composition close to Pt2Fe. According to the nomen-clature by L. Cabri and C. Feather [1975] these minerals correspond to ferroan platinum. Based on geological position and geochemical features of investigated PGE mineralization the particular rock sources have been established. This study has demonstrated the similarity of chemical characteristics of Os-Ir and Pt-Fe alloys of the Bor-Uryakh massif to those of PGM from the Guli massif (Maimecha-Kotui Province), platiniferous zoned-type ultramafic massifs (e.g., Kondyor, Inagli and Chad) of the Aldan Province and Platinum belt of the Urals (Nizhny Tagil, Kytlym, etc.).

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Correspondence to K. N. Malitch.

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The article was translated by the authors.

Published in Russian in Doklady Akademii Nauk, 2011, Vol. 440, No. 6, pp. 806–810.

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Malitch, K.N., Kogarko, L.N. Chemical composition of platinum-group minerals from the Bor-Uryakh massif (Maimecha-Kotui Province, Russia). Dokl. Earth Sc. 440, 1455–1459 (2011). https://doi.org/10.1134/S1028334X11100205

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  • DOI: https://doi.org/10.1134/S1028334X11100205

Keywords

  • Platinum Group Element
  • Siberian Craton
  • Platinum Group Mineral
  • Platinum Belt
  • Platinum Group Element Mineralization