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.

中文翻译：

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在铬铁矿-铂金岩架矿和乌拉尔带状斜辉石-纯长岩地块的砂矿中首次发现原生铱

摘要

介绍了研究乌拉尔含铂带的 Svetloborskii 和 Sosnovskii 单斜辉石-纯长岩地块的铬铁矿以及相关的残积和沟壑砂矿的天然铱聚集体的结果。首次描述了它们的形态特征和内部结构的规律。铂族矿物与天然铱的关联已经建立。已经研究了天然铱聚集体的结构和组成特征以及它们与 Fe-Pt 金属间化合物的时空关系。获得的数据使得可以得出结论，天然铱是在 850 至 1345°C 的温度范围内在发展斜辉石-纯长岩侵入体的岩浆阶段形成的。在我们的研究过程中，