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Russian Geology and Geophysics

2014 year, number 8

MINERAL INCLUSIONS IN Fe-Pt SOLID SOLUTION FROM THE ALLUVIAL ORE OCCURRENCES OF THE ANABAR BASIN (northeastern Siberian Platform)

E.V. Airiyants1, S.M. Zhmodik1,2, P.O. Ivanov3, D.K. Belyanin1,2, L.V. Agafonov1
1V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
2Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia
3Almazy Anabar Open Joint-Stock Company, ul. Chernyshevskogo 6, Yakutsk, 677000, Russia
Keywords: Ferroan platinum, mineral inclusions, bowieite, kingstonite, miassite, ore-forming system

Abstract

This study is concerned with the typochemical features of heavy-concentrate platinum from diamond placers of the Mayat-Vodorazdel’nyi site in the Anabar River basin. Platinum occurs there as Fe–Pt solid solutions (ferroan platinum of RuRh specialization, ~90%), as well as minor Pd and Irferroplatinum. Among PGE minerals, OsIrRu alloys and chengdeite are revealed. Inclusions of PGE minerals are thoroughly studied, and the scales of their spread, the composition of mineral phases, and the relations between them are determined. Ruthenium-containing highRh ferroplatinum bears a lot of inclusions of RhS composition: Rh-containing PGE thiospinels and sulfides and arsenides of Rh, Ru, and Pt. In lowRh platinum, mineral inclusions are much scarcer and usually form other parageneses. The mineral compositions in the system RhSRu indicate the existence of a long isomorphous series Rh3S4Ru3S4, with the content of Ru3S4 reaching 15 at.%.

DOI: http://dx.doi.org/10.1016/j.rgg.2014.07.003