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New constraints on the abundances of phosphorus and sulfur in the lunar core: High-pressure and high-temperature experimental study of the Fe-S-P ternary system
Kuan Zhai; Yuan Yin; Shuangmeng Zhai
2022
发表期刊Geochimica et Cosmochimica Acta
卷号334页码:1-13
摘要

High-pressure and high-temperature experiments for the Fesingle bondSsingle bondternary system were performed at 3–5 GPa and 1173–1873 K. We systematically investigated the effect of pressure, temperature, and bulk composition on the phase relationships, on the core crystallization sequences, and on the presence of sulfur and phosphorous in the lunar core. Our experimental results indicate that while up to < 1 wt% phosphorus can be dissolved in solid iron in the Fesingle bondSsingle bondP ternary system at 3 and 5 GPa, S dissolution in solid iron is near negligible. On the iron rich (S + P < 10 wt%) side of the Fesingle bondSsingle bondphase diagram completely miscible Fesingle bondSsingle bondP liquids were observed. Combined with previous experimental results, the relationship of the sulfur content in the liquid metal (XSliquid) and the partitioning coefficient of phosphorus (DP) between the solid and liquid metal follows an equation of lgDP=-1.8286-17.87×lg1-XSliquid. Tradeoff between the liquidus of the Fesingle bondSsingle bondP system and the (S + P) content of the lunar core well constrain the upper limit of the (S + P) content in the liquid lunar outer core to the concentrations between 8.7 and 13.1 wt%. Using the result of the phosphorus coefficient and our partitioning model, we further assessed the abundances of 6.08–7.15 wt% S, 0.54 ± 0.01 wt% P in the lunar liquid outer core, and 0.05 ± 0.01 wt% S, 0.07 ± 0.01 wt% P in the lunar solid inner core, respectively. Integrating the observed lunar core adiabat and the pressure dependence of the Fesingle bondSsingle bondP liquidus temperature, we propose that the solidification regime in the lunar core will switch from bottom-up to top-down once the abundance of (S + P) in the liquid outer core exceeds 3.5 wt% as the core evolves.

关键词Lunar Core Fe-s-p Phase Diagram Partitioning Coefficient Inner Core Solidification
DOI10.1016/j.gca.2022.07.024
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收录类别SCI
语种英语
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被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/13522
专题地球内部物质高温高压实验室
地球深部物质与流体作用地球化学研究室
作者单位1.Key LaUniversity of Chinese Academy of Sciences, Beijing 100049, Chinaboratory of High-temperature and High-pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081 China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
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Kuan Zhai,Yuan Yin,Shuangmeng Zhai. New constraints on the abundances of phosphorus and sulfur in the lunar core: High-pressure and high-temperature experimental study of the Fe-S-P ternary system[J]. Geochimica et Cosmochimica Acta,2022,334:1-13.
APA Kuan Zhai,Yuan Yin,&Shuangmeng Zhai.(2022).New constraints on the abundances of phosphorus and sulfur in the lunar core: High-pressure and high-temperature experimental study of the Fe-S-P ternary system.Geochimica et Cosmochimica Acta,334,1-13.
MLA Kuan Zhai,et al."New constraints on the abundances of phosphorus and sulfur in the lunar core: High-pressure and high-temperature experimental study of the Fe-S-P ternary system".Geochimica et Cosmochimica Acta 334(2022):1-13.
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