Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)

Geochemistry and mineralogy of PGE in chromites from the Centralnoye I deposit, Polar Urals, Russia


Jan Pašava, Ilja Knésl, Anna Vymazalová, Ivan Vavřín, Ivanovna Gurskaja, Leonid Kolbancev

Geoscience Research Reports 43, 2010 (GRR for 2009), pages 236–239

Full text (PDF, 0.2 MB)



The region of the Polar Urals (Russia) is known for occurrences of large Cr-bearing massifs. We present the new data on platinum group elements geochemistry and mineralogy in chromite ores from various orebodies of the Centralnoye I deposit including host dunite. The deposit is located within the Ray-Iz ultramafic massif that belongs to the Ural ophiolite belt. Anomalous IPGE values indicate the predominance of Ir-Os-Ru-bearing phases among the platinum group minerals (PGM) assemblage that is typical of mantle-hosted ophiolitic chromite ores. Low Pt values in chromites and increased Pt values in host dunites could reflect the presence of cumulus PGM grains. The most abundant platinum-group mineral in studied chromite is erlichmanite (up to 15 |m). Less common are cuproiridsite (up to 5 |m), irarsite (up to 4-5 |m) and laurite (up to 4 |m). Predominant sulphide is heazlewoodite, in intergrowth with Ni-Fe alloys, sporadically with pentlandite, and rarely with pure nickel. Considering average PGE values and estimated Cr-ore resources, the Centralnoye I deposit can be considered as an important resource of PGE.