Rhodium Solubility in Silicate Melts

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
A. A. Borisov
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引用次数: 0

Abstract

All published experimental data on Rh solubility in silicate melts were combined to derive an equation relating Rh solubility to temperature, oxygen fugacity, and a melt composition. It is demonstrated that Rh is dissolved in a melt dominantly as Rh2+ in the entire experimental fO2 range, from pure oxygen to QFM + 2 (QFM is the quartz–magnetite–fayalite buffer). The temperature dependence of Rh solubility is anomalous. Similar to the solubilities of other noble metals, Rh solubility at a constant fO2 increases with increasing temperature. The Rh metal/silicate partition coefficient was calculated (\(D_{{{\text{Me/Sil}}}}^{{{\text{Rh}}}}\) ≈ 3.5 × 107) for the expected conditions of Earth differentiation into a core and mantle. It is demonstrated that the late chondritic veneer model is able to best explain high Rh contents in upper mantle rocks. The suggested equation makes it possible to discard experimental glasses contaminated with metallic Rh micronuggets and thus to get rid of at least the most gross errors in the determination of Rh partition coefficients between rock-forming minerals and melt.

Abstract Image

铑在硅酸盐熔体中的溶解度
所有已发表的关于Rh在硅酸盐熔体中的溶解度的实验数据结合起来,得出了Rh溶解度与温度、氧逸度和熔体成分的关系式。结果表明,在从纯氧到QFM + 2 (QFM是石英-磁铁矿-铁矾石缓冲液)的整个实验fO2范围内,Rh主要以Rh2+的形式溶解于熔体中。Rh溶解度的温度依赖性是反常的。与其他贵金属的溶解度类似,在一定的fO2下,Rh的溶解度随着温度的升高而增加。根据地球分化为地核和地幔的预期条件,计算了Rh金属/硅酸盐分配系数(\(D_{{{\text{Me/Sil}}}}^{{{\text{Rh}}}}\)≈3.5 × 107)。结果表明,晚球粒岩贴面模型最能解释上地幔岩石的高Rh含量。所建议的方程式使我们有可能丢弃被金属Rh微颗粒污染的实验玻璃,从而在确定岩石形成矿物和熔体之间的Rh分配系数时,至少可以消除最严重的误差。
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来源期刊
Petrology
Petrology 地学-地球科学综合
CiteScore
2.40
自引率
20.00%
发文量
27
审稿时长
>12 weeks
期刊介绍: Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
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