The deepest terminations of the Mount Rudnaya subvertical massive sulfide offshoots of the Norilsk 1 orebody are composed of exceptionally fine grained sulfides that are believed to be natural quenched sulfide solid solutions. Copper-rich intermediate solid solution (ISS) and Fe-rich monosulfide solid solution (MSS) form an equigranular and lamellar matrix hosting MSS- and ISS-dominant globules. The nonstoichiometric chemical compositions of the solid solutions plot within their high-temperature fields known from experiments. MSS contains 19 to 35 wt % Ni, 0.09 to 0.45 wt % Co, and up to 0.6 wt % Cu and is heterogeneously enriched in Rh (up to 32 ppm), Ir (up to 0.6 ppm), Pt (up to 65 ppm), and Pd (up to 168 ppm). ISS occurs as the lamellar intergrowths of the chalcopyrite (Ccp_ss) and cubanite (Cub_ss) solid solutions, which bear up to 4.74 wt % Ni and 0.2 wt % Co and are heterogeneously enriched in Zn, Ag, and In. The assemblage of platinum group minerals (PGMs) is hosted mostly in the ISS and is dominated by Pt-Fe alloys and minerals of the rustenburgite-atokite series, like the set of PGMs at the Norilsk 1 deposit. Similar Pt-Pd-Sn compounds in the laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) spectra of profiles through MSS and ISS are interpreted to be trapped microinclusions.The pentlandite contains up to 0.13 wt % Pt, up to 4.62 wt % Pd, <0.53 wt % Co, and <0.4 wt % Cu according to electron microprobe analysis. LA-ICP-MS data and mapping show that Pd content in the pentlandite increases toward contacts with ISS and decreases toward contacts with MSS, supporting a reaction origin of pentlandite. The wide variations of the concentrations of major and trace elements in the solid solutions, as well as the coexistence of Pd-poor (a few ppm Pd) and Pd-rich (over 4.62 wt % Pd) pentlandite within a single sample, seem to characterize the different generations of the MSS to MSS-ISS globules, antecrysts, and phenocrysts with the distinct histories of enrichment due to exchange with fractionated Cu-platinum group element-rich residue. The directional distribution of Pd of high-temperature primary magmatic origin is preserved due to rapid quenching of the sulfides from ~650°C.

中文翻译：

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天然淬火硫化物固溶体的铂族元素富集，俄罗斯Norilsk 1矿床

Norilsk 1矿体的Mount Rudnaya亚垂直大块硫化物分支的最深端部是由极细的硫化物组成，这些硫化物被认为是自然淬火的硫化物固溶体。富铜的中间固溶体（ISS）和富铁的单硫化物固溶体（MSS）形成等粒度和层状基质，其中包含MSS和ISS优势球。固溶体的非化学计量化学成分在实验已知的高温场内绘制。MSS包含19至35 wt％的Ni，0.09至0.45 wt％的Co和最高0.6 wt％的Cu，并且异质地富集了Rh（最高32 ppm），Ir（最高0.6 ppm），Pt（最高65 ppm） ）和Pd（最高168 ppm）。ISS发生为黄铜矿（Ccp _ss）和绿铅矿（Cub的层状共生）_ss）固溶体，其固含量最高为4.74 wt％的Ni和0.2 wt％的Co，并且异质地富含Zn，Ag和In。铂族矿物（PGM）的集合主要存在于国际空间站中，并且以Pt-Fe合金和rustenburgite-atokite系列矿物为主导，例如Norilsk 1矿床中的PGM集合。通过MSS和ISS进行的激光烧蚀-电感耦合等离子体质谱（LA-ICP-MS）光谱中的类似Pt-Pd-Sn化合物被解释为捕获的微夹杂物。该方铁矿中的铂含量最高为0.13 wt％根据电子探针分析，Pd为4.62 wt％Pd，<0.53 wt％Co和<0.4 wt％Cu。LA-ICP-MS数据和作图显示，该膨润土中的Pd含量随着与ISS接触而增加，而随着与MSS接触而减少，从而支持了膨润土的反应起源。固溶体中主要元素和痕量元素的浓度变化很大，并且在单个样品中似乎同时存在贫Pd（少量ppm Pd）和富Pd（超过4.62 wt％Pd）的膨润土。通过与分馏的富含铜-铂族元素的残基交换而表征具有不同的富集历史的MSS到MSS-ISS小球，前晶和隐晶的不同世代。由于硫化物从〜650°C快速淬灭，因此保留了高温一次岩浆成因的Pd的方向分布。似乎表征了不同世代的MSS到MSS-ISS小球，前晶和隐晶，由于与分馏的富含铜铂族元素的残基交换而具有不同的富集历史。由于硫化物从〜650°C快速淬灭，因此保留了高温一次岩浆成因的Pd的方向分布。似乎表征了不同世代的MSS到MSS-ISS小球，前晶和隐晶，由于与分馏的富含铜铂族元素的残基交换而具有不同的富集历史。由于硫化物从〜650°C快速淬灭，因此保留了高温一次岩浆成因的Pd的定向分布。