Abstract

The 3D-mineralogical technology was used to study a representative selection of grains of thiospineles from three groups of chromitite horizons (lower LG6, middle MG1/MG2 and upper UG2): 46 grains of malanite (4–42 μm) and 34 grains of cuprorhodsite (9–42 μm). Their microprobe analysis was performed (n = 61). The statistics for this selection of grains have resulted in the following formulas: for malanite, (Сu²⁺,Fe²⁺)(Pt³⁺Rh³⁺,Ir³⁺,Co³⁺,Ni³⁺Fe³⁺)₂S₄ and for cuprorhodsite, (Сu²⁺,Fe²⁺)(Rh³⁺,Pt³⁺,Ir³⁺,Fe³⁺)₂S₄. According to morphological properties and their relationship with platinum-group minerals (PGMs) and base metal sulfides, thiospinel can be attributed to the earliest primary PGMs in chromitites. The distribution of cuprorhodsite and malanite in chromitites was controlled by the Rayleigh fractionation of the primary sulfide melt in the process of formation of Bushveld chromitite horizons.

中文翻译：

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南非布什维尔德综合体的铬铁矿中的锰铁矿和铜矿的新数据

摘要

3D矿物学技术用于研究从三组铬铁矿层（下部LG6，MG1 / MG2和上部UG2）中代表性的硫代尖晶石晶粒的选择：46粒马来石（4–42μm）和34粒铜矿（9–42μm）。他们进行了微探针分析（n = 61）。对这种晶粒选择的统计得出以下公式：对于马来石，（Сu2 ⁺，Fe 2 ⁺）（Pt ³⁺ Rh ³⁺，Ir ³⁺，Co ³⁺，Ni ³⁺ Fe ³⁺）₂ S ₄和铜铁矿，（Сu2 ⁺，Fe 2 ⁺）（Rh ³⁺，Pt ³⁺，Ir ³⁺，Fe ³⁺）₂ S ₄。根据形态特征及其与铂族矿物（PGM）和贱金属硫化物的关系，硫代松油可归因于铬铁矿中最早的一次PGM。在Bushveld铬铁矿层位形成过程中，一次硫化物熔体的瑞利分馏控制了铬铁矿中铜矿和锰铁矿的分布。