| DOI: | 10.1038/ngeo2896
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| 论文题名: | Non-chondritic iron isotope ratios in planetary mantles as a result of core formation |
| 作者: | Elardo S.M.; Shahar A.
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| 刊名: | Nature Geoscience
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| ISSN: | 17520894
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| 出版年: | 2017
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| 卷: | 10, 期:4 | | 起始页码: | 317
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| 结束页码: | 321
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| 语种: | 英语
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| Scopus关键词: | asteroid
; core (planetary)
; crystallization
; iron
; isotopic fractionation
; isotopic ratio
; mantle
; Mars
; Moon
; nickel
; partial melting
; planetary evolution
; silicate
; solar system
|
| 英文摘要: | Information about the materials and conditions involved in planetary formation and differentiation in the early Solar System is recorded in iron isotope ratios. Samples from Earth, the Moon, Mars and the asteroid Vesta reveal significant variations in iron isotope ratios, but the sources of these variations remain uncertain. Here we present experiments that demonstrate that under the conditions of planetary core formation expected for the Moon, Mars and Vesta, iron isotopes fractionate between metal and silicate due to the presence of nickel, and enrich the bodies' mantles in isotopically light iron. However, the effect of nickel diminishes at higher temperatures: under conditions expected for Earth's core formation, we infer little fractionation of iron isotopes. From our experimental results and existing conceptual models of magma ocean crystallization and mantle partial melting, we find that nickel-induced fractionation can explain iron isotope variability found in planetary samples without invoking nebular or accretionary processes. We suggest that near-chondritic iron isotope ratios of basalts from Mars and Vesta, as well as the most primitive lunar basalts, were achieved by melting of isotopically light mantles, whereas the heavy iron isotope ratios of terrestrial ocean floor basalts are the result of melting of near-chondritic Earth mantle. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/105817
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| Appears in Collections: | 气候减缓与适应
科学计划与规划
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作者单位: | Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC, United States
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| Recommended Citation: | |
Elardo S.M.,Shahar A.. Non-chondritic iron isotope ratios in planetary mantles as a result of core formation[J]. Nature Geoscience,2017-01-01,10(4)
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