globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2017.12.042
Scopus记录号: 2-s2.0-85044756008
论文题名:
Chondritic Mn/Na ratio and limited post-nebular volatile loss of the Earth
作者: Siebert J.; Sossi P.A.; Blanchard I.; Mahan B.; Badro J.; Moynier F.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 485
起始页码: 130
结束页码: 139
语种: 英语
英文关键词: bulk Earth composition ; core formation ; laser-heated diamond anvil cell ; post-nebular volatilization ; volatile depletion
Scopus关键词: Budget control ; Experimental mineralogy ; Meteorites ; Silicates ; Bulk silicate earth ; Chemical Fractionation ; Chondritic meteorites ; Core formation ; Laser-heated diamond anvil cells ; Pressure and temperature ; volatile depletion ; Volatile elements ; Manganese ; chondrite ; diamond anvil cell ; fractionation ; manganese ; P-T conditions ; silicate ; sodium ; volatilization
英文摘要: The depletion pattern of volatile elements on Earth and other differentiated terrestrial bodies provides a unique insight as to the nature and origin of planetary building blocks. The processes responsible for the depletion of volatile elements range from the early incomplete condensation in the solar nebula to the late de-volatilization induced by heating and impacting during planetary accretion after the dispersion of the H2-rich nebular gas. Furthermore, as many volatile elements are also siderophile (metal-loving), it is often difficult to deconvolve the effect of volatility from core formation. With the notable exception of the Earth, all the differentiated terrestrial bodies for which we have samples have non-chondritic Mn/Na ratios, taken as a signature of post-nebular volatilization. The bulk silicate Earth (BSE) is unique in that its Mn/Na ratio is chondritic, which points to a nebular origin for the depletion; unless the Mn/Na in the BSE is not that of the bulk Earth (BE), and has been affected by core formation through the partitioning of Mn in Earth's core. Here we quantify the metal–silicate partitioning behavior of Mn at deep magma ocean pressure and temperature conditions directly applicable to core formation. The experiments show that Mn becomes more siderophile with increasing pressure and temperature. Modeling the partitioning of Mn during core formation by combining our results with previous data at lower P–T conditions, we show that the core likely contains a significant fraction (20 to 35%) of Earth's Mn budget. However, we show that the derived Mn/Na value of the bulk Earth still lies on the volatile-depleted end of a trend defined by chondritic meteorites in a Mn/Na vs Mn/Mg plot, which tend to higher Mn/Na with increasing volatile depletion. This suggests that the material that formed the Earth recorded similar chemical fractionation processes for moderately volatile elements as chondrites in the solar nebula, and experienced limited post nebular volatilization. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110037
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Institut de Physique du Globe de Paris, Université Sorbonne Paris Cité, Paris, 75005, France; Institut Universitaire de France, France; Earth and Planetary Science Laboratory, Ecole Polytechnique Fédérale de Lausanne, Lausanne, CH-1015, Switzerland

Recommended Citation:
Siebert J.,Sossi P.A.,Blanchard I.,et al. Chondritic Mn/Na ratio and limited post-nebular volatile loss of the Earth[J]. Earth and Planetary Science Letters,2018-01-01,485
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