Journal
MOSCOW UNIVERSITY GEOLOGY BULLETIN
Volume 72, Issue 6, Pages 445-454Publisher
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.3103/S0145875217060096
Keywords
native platinum mineralization; Iov dunite body; Konzhakovsky massif; clinopyroxenite-dunite massifs; isoferroplatinum; tulameenite; nickelferroplatinum; irarsite
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This work presents the results of the first comprehensive study of PGE mineralization from massive chromitites of the Iov dunite body (Northern Urals). The chromitites are composed of chromespinelides with a higher content of Cr2O3 with respect to those from other zonal clinopyroxenite-dunite massifs of the Urals. However, the composition of chromespinelides fits the trend that is characteristic of the dunite-clinopyroxenite-gabbro formation. PGE minerals, in particular Pt-Fe solid solutions, were identified in chromitites and in chromespinelides in the form of crystals and aggregates of a complex non-crystallographic habit and less often of an idiomorphic cubic habit. In terms of stoichiometry, Pt-Fe minerals correspond to ferroplatinum (Pt2Fe) and isoferroplatinum (Pt3Fe). The minerals of the isomorphic tetraferroplatinum-tulameenite-nickelferroplatinum series are widely distributed. Thus, the PGE mineralization of the Iov dunite body has features that are characteristic of clinopyroxenite-dunite massifs of the Urals.
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