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首页> 外文期刊>Contributions to Mineralogy and Petrology >Distribution of platinum-group elements in the Platreef at Overysel, northern Bushveld Complex: a combined PGM and LA-ICP-MS study
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Distribution of platinum-group elements in the Platreef at Overysel, northern Bushveld Complex: a combined PGM and LA-ICP-MS study

机译：布什维尔德综合体北部Overysel的Platreef中铂族元素的分布：PGM和LA-ICP-MS组合研究

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摘要

Detailed mineralogical and laser ablation-inductively coupled plasma-mass spectrometry studies have revealed the physical manifestation of the platinum-group elements (PGE) within the Platreef at Overysel, northern Bushveld Complex, South Africa. The PGE in the Platreef were originally concentrated in an immiscible sulfide liquid along with semi-metals such as Bi and Te. As the sulfide liquid began to crystallize, virtually all the Os, Ir, Ru and Rh partitioned into monosulfide solid solution (mss), which on further cooling, exsolved to form pyrrhotite and pentlandite with Os, Ir and Ru remaining in solid solution in both phases with Rh prefentially partitioning into pentlandite. Platinum, some Pd and Au were concentrated in the residual sulfide liquid after mss crystallization, and were then concentrated in an immiscible late stage melt along with semi metals, which was expelled to the grain boundaries during crystallization of intermediate solid solution (iss) to form Pt and Pd tellurides and electrum around the margins of the sulfide grains. Tiny droplets of this melt trapped in the crystallizing mss and iss cooled to form Pt-Bi-Te microinclusions in all sulfide phases, whilst the excess Pd was accommodated in solid solution in pentlandite. Minor redistribution and recrystallization by hydrothermal fluids occurred around xenoliths and at the very base of the mineralized zone within the footwall, however, the overall lack of secondary alteration coupled with the volatile-poor nature of the gneissic footwall have allowed the preservation of what may be the most 'primary' style of Platreef mineralization. The lack of PGM inclusions within early liquidus phases suggests very early sulfur saturation in the Platreef, lending support to theories involving S saturation occurring prior to intrusion of the Platreef, possibly within a staging chamber.
机译：详细的矿物学和激光烧蚀-电感耦合等离子体质谱研究表明，南非布什维尔德综合体北部奥韦瑟尔的Platreef中铂族元素（PGE）的物理表现。 Platreef中的PGE最初与半金属（例如Bi和Te）一起浓缩在不溶混的硫化物液体中。当硫化物​​液体开始结晶时，几乎所有的Os，Ir，Ru和Rh都分配到单硫化物固溶体（mss）中，在进一步冷却后，它们溶解形成黄铁矿和绿铁矿，而Os，Ir和Ru则固溶于两者Rh的两相可能会分成五方辉石。 mss结晶后，铂，一些Pd和Au浓缩在残留的硫化物液体中，然后与半金属一起浓缩在不溶混的后期熔体中，在中间固溶体（iss）结晶过程中，其排出到晶界硫化物晶粒边缘周围的铂和钯碲化物和电子。该熔体的微小液滴被结晶的mss捕集，并被冷却以形成所有硫化物相中的Pt-Bi-Te微粒夹杂物，而过量的Pd则被容纳在五方沸石的固溶体中。水热流体的微小再分布和重结晶发生在异种石周围和底盘内矿化带的最底部，但是，总体上没有二次变质，加上片麻岩底盘的挥发性差，这使得可能保留了什么。 Platreef矿化的最“主要”样式。液相线早期阶段缺乏PGM夹杂物，表明Platreef的硫饱和度非常早，这为涉及在Platreef侵入之前（可能在分期室内）发生S饱和的理论提供了支持。

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