气候变化领域集成服务门户(CCPortal): Solidification of lunar core from melting experiments on the Fe–Ni

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DOI	10.1016/j.epsl.2019.115834
	Solidification of lunar core from melting experiments on the Fe–Ni–S system
	Liu J.; Li J.
发表日期	2020
ISSN	0012821X
卷号	530
英文摘要	Paleomagnetic records revealed that the early Moon had an Earth-like core dynamo, which was likely driven by thermochemical buoyancy force associated with core solidification. The cause for the cessation of the ancient lunar dynamo at about 3.56 Ga ago remains controversial, partly because the composition and temperature of the Moon are not well constrained and the solidification process of its core remains poorly understood. Here we report experimental data at 5.1 GPa showing that the liquidus temperatures of the Fe–Ni–S system are ∼50–150 K lower than that of the Fe–S system, implying that a Ni-bearing core could remain molten to lower temperatures. Calculating the liquidus temperature gradient using previous data at 3 GPa and the new results at 5.1 GPa, we find that an Fe-S core containing less than ∼4.0 wt.% S would freeze from the center of the Moon. At higher S contents, the core would precipitate solid Fe near the core-mantle boundary. Based on the prevailing lunar core models, a change in core solidification from the bottom-up regime to the top-down regime during the lunar history is possible only if its bulk S content falls between about 2.0 and 4.0 wt.%. © 2019 Elsevier B.V.
关键词	Earth's Moon liquidus curve lunar dynamo multi-anvil experiments
英文关键词	Interactive devices; Iron compounds; Moon; Solidification; Structural geology; Core solidification; Core-mantle boundary; Liquidus curve; Liquidus temperature; Lower temperatures; Multi anvils; Paleomagnetic record; Solidification process; Sulfur compounds; chemical composition; core-mantle boundary; iron; melting; Moon; nickel; solidification; sulfur; temperature gradient
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202746
作者单位	Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, United States
推荐引用方式 GB/T 7714	Liu J.,Li J.. Solidification of lunar core from melting experiments on the Fe–Ni–S system[J],2020,530.
APA	Liu J.,&Li J..(2020).Solidification of lunar core from melting experiments on the Fe–Ni–S system.Earth and Planetary Science Letters,530.
MLA	Liu J.,et al."Solidification of lunar core from melting experiments on the Fe–Ni–S system".Earth and Planetary Science Letters 530(2020).