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DOI | 10.1038/NGEO2896 |
Non-chondritic iron isotope ratios in planetary mantles as a result of core formation | |
Elardo, Stephen M.; Shahar, Anat | |
2017-04-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2017 |
卷号 | 10期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
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. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000398162800022 |
WOS关键词 | EARTHS CORE ; MAGMATIC DIFFERENTIATION ; CHEMICAL-MODEL ; SOURCE REGIONS ; FRACTIONATION ; MARS ; MOON ; EQUILIBRIUM ; CONSTRAINTS ; ACCRETION |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35106 |
专题 | 地球科学 气候变化 |
作者单位 | Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA |
推荐引用方式 GB/T 7714 | Elardo, Stephen M.,Shahar, Anat. Non-chondritic iron isotope ratios in planetary mantles as a result of core formation[J]. NATURE GEOSCIENCE,2017,10(4). |
APA | Elardo, Stephen M.,&Shahar, Anat.(2017).Non-chondritic iron isotope ratios in planetary mantles as a result of core formation.NATURE GEOSCIENCE,10(4). |
MLA | Elardo, Stephen M.,et al."Non-chondritic iron isotope ratios in planetary mantles as a result of core formation".NATURE GEOSCIENCE 10.4(2017). |
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