Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Résumé Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Nekrasov, I. Ya. Articles by Taskaev, V. I. Search for Related Content GeoRef GeoRef Citation

COMPOSITIONAL VARIATIONS IN PLATINUM-GROUP MINERALS AND GOLD, KONDER ALKALINE-ULTRABASIC MASSIF, ALDAN SHIELD, RUSSIA

Ivan Ya. Nekrasov, Alexander M. Lennikov, Boris L. Zalishchak, Rostislav A. Oktyabrsky, Vladimir V. Ivanov, Valery I. Sapin and Vladimir I. Taskaev

Far East Geological Institute, Far East Division, Russian Academy of Sciences, 159, prospect 100-letya, Vladivostok, 690022, Russia

E-mail address: anortozit{at}mail.ru

The platinum-group minerals (PGM) of the Konder zoned alkali-ultrabasic massif, located east of the Aldan Shield, in far-eastern Russia, are predominantly represented by isoferroplatinum of two generations, both with Fe contents ranging from 7.5 to 11.5 wt.%. A high-temperature isoferroplatinum is saturated with platinum-group-element (PGE) impurities: up to 5.3 Ir, 2.9 Os, and 1.8 Rh (all in wt.%). In contrast, the later isoferroplatinum contains lower levels of Ir, Os and Rh: less than 1.9 Ir, 1.0 Os, 0.6 Rh (in wt.%). The minor PGM are represented by a wide range of solid solutions in the system Os–Ir–Rh–Pt, tetraferroplatinum, tulameenite, hongshiite, minerals of erlichmanite–laurite and irarsite–hollingworthite series, sperrylite, bismuthides, antimonides, tellurides, stannides, and hydroxides. There are possibly new mineral species: native ruthenium, the Pd-dominant analogue of hongshiite, Pt₂As₃, the Pt-dominant analogue of konderite and inaglyite, and others minerals, which form rims around grains of isoferroplatinum and inclusions in it. A similar morphology and distribution as found with Pt₃Fe are observed with gold, related to rare lenses of sulfide and impregnations in dunite (Cu-, Pt-, and Pd-bearing high-grade gold) and monzodiorite cutting dunite (low-impurity middle- and low-grade gold).

Keywords: platinum-group minerals, gold, rare minerals, Konder massif, Aldan Shield, Russia.