气候变化领域集成服务门户(CCPortal): Abundance of highly siderophile elements in lunar basalts controlled by iron sulfide melt

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DOI	10.1038/s41561-019-0426-3
	Abundance of highly siderophile elements in lunar basalts controlled by iron sulfide melt
	Brenan J.M.; Mungall J.E.; Bennett N.R.
发表日期	2019
ISSN	17520894
卷号	12 期号:9
英文摘要	The Moon accreted meteoritic material towards the end of Solar System formation. Quantification of this late accretion requires an estimation of the abundance of highly siderophile, or iron-loving, elements in the lunar mantle. As lunar mantle samples are not available, estimates are derived from lunar basalt compositions, but the melting phase relations needed to derive the mantle composition are poorly constrained. Here we present sulfur solubility measurements from laboratory experiments, combined with thermodynamic calculations, which show that the lunar basalt source is likely to be saturated in a sulfur-poor, iron-rich sulfide melt that concentrates some highly siderophile elements more than others. We found that the observed range in the ratios of highly siderophile elements in primitive lunar basalts is much smaller than expected from residual sulfide control alone. Instead, the elemental ratios are consistent with mixing between primary sulfide-saturated melts and minute (<1%) amounts of lunar regolith that contain impact debris. Although the composition of some samples suggests a highly depleted lunar mantle, the exact level of depletion is unclear, because mixing trajectories overlap at the inferred level of regolith contamination. We conclude that the composition of the lunar mantle is veiled by regolith contamination of the lunar basalts. If so, highly siderophile element abundances in lunar mantle-derived materials cannot be used to determine the mass of material accreted late onto the Moon. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	accretion; basalt; iron sulfide; lunar mantle; melting; Moon; quantitative analysis; regolith; siderophile element; siderophore
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124613
作者单位	Department of Earth and Environmental Sciences, Dalhousie University, Halifax, NS, Canada; Department of Earth Science, Carleton University, Ottawa, ON, Canada; Geophysical Laboratory, Carnegie Institution for Science, Washington, DC, United States
推荐引用方式 GB/T 7714	Brenan J.M.,Mungall J.E.,Bennett N.R.. Abundance of highly siderophile elements in lunar basalts controlled by iron sulfide melt[J],2019,12(9).
APA	Brenan J.M.,Mungall J.E.,&Bennett N.R..(2019).Abundance of highly siderophile elements in lunar basalts controlled by iron sulfide melt.Nature Geoscience,12(9).
MLA	Brenan J.M.,et al."Abundance of highly siderophile elements in lunar basalts controlled by iron sulfide melt".Nature Geoscience 12.9(2019).