Phase Relationships and Distribution of S, Fe, Co, Ni, Re, Os, and Pt between Metal and Sulfide Melts in the Basalt–Fe–FeS–C System at 1400°C and 4 GPa

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Doklady Earth Sciences Pub Date : 2024-09-16 DOI:10.1134/s1028334x24603092

N. S. Gorbachev, Yu. B. Shapovalov, A. V. Kostyuk, P. N. Gorbachev, A. N. Nekrasov

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Abstract

The immiscibility of a Fe–FeS–C melt into Fe-metal (Mc) and Fe-sulfide (Ms) liquids has been studied in the basalt–Fe–FeS–C system at 4 GPa and 1400°C. The partition (D) and distribution (Kd) coefficients of S, Fe, Co, Ni, Re, Os, and Pt between the Mc and Ms melts are determined. The partition coefficients D served as indicators of the siderophilic and chalcophilic properties of each element, and Kd characterized their interelemental ratios during fractionation. In the Fe–Os–Co–Re series with D > 1, siderophilic properties prevail, which increase with increasing values of the partition coefficients: 1.2–1.5–1.6–12.6. In the Ni–Pt–S series with D < 1, chalcophilic properties prevail, which increase with decreasing D: 0.9–0.6–0.1. The values of the distribution coefficients Kd Re/Os (8.4) and Pt/Os (0.4) indicate the fractionation of Re and Pt relative to Os, with enrichment of rhenium in a metallic melt and platinum in a sulfide melt and a shift in the fractionation of the Re/Os and Pt/Os relations and related systems of ¹⁸⁷Re/¹⁸⁷Os and ¹⁹⁰Pt/¹⁸⁶Os isotopes. The genetic relationship of magmatic sulfide mineralization in intrusive of the Upper Norilsk (ore-bearing) and Lower Norilsk (ore-free) types with metal–sulfide immiscibility of sulfide magma is evidenced by the similarity of the Re/Os ratio in the Upper Norilsk intrusive with the ratio in the Ms component, and in the Lower Norilsk intrusive with the Mc component.

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1400°C 和 4 GPa 下玄武岩-Fe-FeS-C 体系中金属熔体与硫化物熔体之间的 S、Fe、Co、Ni、Re、Os 和 Pt 相关系与分布

摘要在 4 GPa 和 1400°C 的玄武岩-Fe-FeS-C 体系中研究了铁-FeS-C 熔体分为铁金属（Mc）液和铁硫化物（Ms）液的不可溶性。测定了 S、Fe、Co、Ni、Re、Os 和 Pt 在 Mc 和 Ms 熔体之间的分配系数 (D) 和分布系数 (Kd)。分配系数 D 是每种元素嗜铁和嗜铝特性的指标，而 Kd 则表征了它们在分馏过程中的元素间比率。在 D > 1 的 Fe-Os-Co-Re 系列中，嗜铁性占主导地位，随着分配系数值的增加，嗜铁性也随之增加：1.2-1.5-1.6-12.6.在 D < 1 的 Ni-Pt-S 系列中，嗜铬性占主导地位，随着 D 的减小而增加：0.9-0.6-0.1。分布系数 Kd Re/Os（8.4）和 Pt/Os（0.4）的值表明 Re 和 Pt 相对于 Os 的分馏，金属熔体中的铼和硫化物熔体中的铂富集，Re/Os 和 Pt/Os 关系以及 187Re/187Os 和 190Pt/186Os 同位素相关系统的分馏发生了变化。上诺里尔斯克（含矿）和下诺里尔斯克（无矿）类型侵入体中的岩浆硫化物矿化与硫化物岩浆的金属-硫化物不溶性的遗传关系，可以从上诺里尔斯克侵入体中的Re/Os比率与Ms成分中的比率以及下诺里尔斯克侵入体中的Mc成分中的比率的相似性得到证明。

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来源期刊

Doklady Earth Sciences 地学-地球科学综合

CiteScore

1.40

自引率

22.20%

发文量

138

审稿时长

3-6 weeks

期刊介绍： Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.