Partitioning of nickel, copper, iridium, rhenium, platinum, and palladium between monosulfide solid solution and sulfide liquid: Effects of composition and temperature
Partitioning of nickel, copper, iridium, rhenium, platinum, and palladium between monosulfide solid solution and sulfide liquid: Effects of composition and temperature
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DOI：
10.1016/0016-7037(96)00009-9
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发表时间：
1996-04
影响因子：
5
通讯作者：
Chusi Li;S. Barnes;E. Makovicky;J. Rose-Hansen;M. Makovicky
中科院分区：
文献类型：
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作者：
Chusi Li;S. Barnes;E. Makovicky;J. Rose-Hansen;M. Makovicky
在1000和1100°C和1个大气压下，研究了Ni，Cu和Pt族元素（Ir，Rh，Pt，Pd）在Fe-Ni-Cu-S系中单硫化物固溶体（Mss）和硫化物液相之间的分配。Ni的能斯特分配系数（D = Mss中的wt%/硫化物液体中的wt%）在0.19至1.17之间显著变化，而DCushow的值在0.17至0.27的有限范围内。Ir的分配系数范围为1.06至13。在相同条件下，铑的分配系数略低于Ir的分配系数，范围为0.37至8.23。Pt和Pd的分配系数分别为0.05 - 0.16和0.08 - 0.27。分配系数强烈地依赖于系统的体S含量。它们都随着MS和液体中S含量的增加而增加。铂、钯和铜在Mss结晶过程中表现不相容，强烈分配到硫化物液体中。镍在硫不饱和体系和硫饱和体系中不相容。当系统是S-过饱和时，它变得相容。铑在硫饱和和硫过饱和体系中是相容的，而在硫不饱和体系中是不相容的。当体系从硫饱和到硫饱和再到硫不饱和时，铱从高相容到中等相容再到轻微相容。温度对金属分配的影响仅在S-过饱和体系中观察到，其中Ni和Rh的分配系数随温度的降低而增加。在硫饱和条件下，Ir和Rh的相容行为以及Pt和Pd与Cu的不相容行为似乎支持了在安大略的萨德伯里和西伯利亚的诺里尔斯克等硫化物矿床中观察到的金属分带是硫化物液体分馏作用的假说。
Partitioning of Ni, Cu, and Pt-group elements (Ir, Rh, Pt, Pd) between monosulfide solid solution (Mss) and sulfide liquid has been investigated in the Fe-Ni-Cu-S system at 1000 and 1100°C and one atmosphere pressure. The Nernst partition coefficients (D = wt% in Mss/wt% in sulfide liquid) for Ni vary significantly from 0.19 to 1.17, while the values of DCushow a limited range of 0.17–0.27. The partition coefficients for Ir range from 1.06 to 13. Rhodium has a partition coefficient slightly lower than that of Ir under the same conditions, ranging from 0.37 to 8.23. The partition coefficients for Pt and Pd vary from 0.05 to 0.16, and from 0.08 to 0.27, respectively. The partition coefficients depend strongly on the bulk S contents of the system. They increase with increasing S contents in both Mss and liquid. Platinum, Pd, and Cu behave incompatibly during Mss crystallization, strongly partitioning into sulfide liquid. Nickel is incompatible in S-undersaturated systems and S-saturated systems. It becomes compatible when the system is S-oversaturated. Rhodium is compatible in S-saturated and S-oversaturated systems, but incompatible in S-undersaturated systems. Iridium changes from highly compatible through moderately compatible to slightly compatible when the system changes from S-oversaturated through S-saturated to S-undersaturated. The effect of temperature on metal partitioning is observed only in S-oversaturated systems, in which the partition coefficients for Ni and Rh increase with decrease of temperature. The compatible behavior of Ir and Rh, and incompatible behavior of Pt and Pd and Cu under S-saturated conditions appears to support the hypothesis that the observed metal zonation in many sulfide ore deposits such as Sudbury, Ontario and Noril'sk, Siberia resulted from sulfide liquid fractionation.