Abstract
The results of studying the aggregates of native iridium from chromitites of the Svetloborskii and Sosnovskii clinopyroxenite–dunite massifs of the platinum-bearing belt of the Urals and associated eluvial and ravine placers are presented. For the first time, their morphological features and the regularities of the internal structure are described. The association of the platinum group minerals with native iridium has been established. The structural and compositional features of native iridium aggregates and their space–time relationships with Fe–Pt intermetallic compounds have been studied. The data obtained made it possible to conclude that native iridium was formed in the temperature range from 850 to 1345°C at the magmatic stage of developing clinopyroxenite–dunite intrusions. In the course of our research, it was also established that the distribution of native iridium in ledge ores and placers might indicate either a deep erosional truncation of clinopyroxenite–dunite massifs or the particularity of the primary ore-forming matter.
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Funding
This study was conducted within the framework of the taxpayer-funded research of Zavaritskii Institute of Geology and Geochemistry, Ural Branch, Russian Academy of Sciences, state registration no. АААА-А18-118052590032-6. The analytical studies were supported by the Russian Science Foundation, project no. 20-77-00073.
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Translated by D. Voroshchuk
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Stepanov, S.Y., Puchkov, V.N., Palamarchuk, R.S. et al. First Finds of Native Iridium in Chromite–Platinum Ledge Ore and Placers of Zonal Clinopyroxenite–Dunite Massifs of the Urals. Dokl. Earth Sc. 499, 628–633 (2021). https://doi.org/10.1134/S1028334X21080195
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DOI: https://doi.org/10.1134/S1028334X21080195