globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116468
论文题名:
Metal-silicate silicon isotopic fractionation and the composition of the bulk Earth
作者: Moynier F.; Deng Z.; Lanteri A.; Martins R.; Chaussidon M.; Savage P.; Siebert J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 549
语种: 英语
中文关键词: accretion ; core formation ; geochemistry ; Itqyi ; meteorites ; planetary differentiation
英文关键词: Geochemistry ; Isotopes ; Metals ; Meteorites ; Silicates ; Chemical compositions ; Isotopic composition ; Isotopic fractionation factors ; Isotopic fractionations ; Metal silicates ; Natural experiment ; Primitive meteorites ; Terrestrial planets ; Silicon ; chemical composition ; core (planetary) ; isotopic fractionation ; meteorite ; silicate ; silicon ; trace metal
英文摘要: The difference in the Si isotopic composition between the Earth and primitive meteorites had been used to constrain the amount of Si in the Earth's core. However, there is presently a debate on the magnitude of the isotopic fractionation between metal and silicates as function of temperature based on experimental data. Here, we use a natural sample, an enstatite meteorite, Itqyi, as a natural experiment to determine an independent Si isotopic fractionation factor between metal and silicate. We determined the temperature of equilibrium between metal and silicate as well as the Si isotopic composition between the phases. We find that the dependence of Si isotopes with temperature to be: [Formula presented] Using this dependence of the δ30Si with temperature we estimate the bulk Earth δ30Si as a function of Si content of the core for different plausible conditions. Even when using the most extreme parameters, we show that the bulk Earth must be isotopically heavier than any chondrites groups. We therefore confirm that core formation alone cannot account for the isotopic difference between the Earth and primitive meteorites. We show that there is no correlation between δ30Si and the Mg/Si ratio suggesting that forsterite fractionation in the solar nebula may have had only a limited effect, if any. Our new results therefore confirm that volatility should have had a fundamental effect in shaping terrestrial planets chemical composition. © 2020 Elsevier B.V.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165178
Appears in Collections:气候变化与战略

Files in This Item:

There are no files associated with this item.


作者单位: Institut de Physique du Globe de Paris, Université de Paris, CNRS, 1 rue Jussieu, Paris, 75005, France; School of Earth and Environmental Sciences, University of St Andrews, Irvine Building, St Andrews, KY16 9AL, United Kingdom; Institut Universitaire de France, 103 boulevard Saint-Michel, Paris, 75005, France

Recommended Citation:
Moynier F.,Deng Z.,Lanteri A.,et al. Metal-silicate silicon isotopic fractionation and the composition of the bulk Earth[J]. Earth and Planetary Science Letters,2020-01-01,549
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Moynier F.]'s Articles
[Deng Z.]'s Articles
[Lanteri A.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Moynier F.]'s Articles
[Deng Z.]'s Articles
[Lanteri A.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Moynier F.]‘s Articles
[Deng Z.]‘s Articles
[Lanteri A.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.