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DOI | 10.1038/s41561-020-0578-1 |
The Earth's core as a reservoir of water | |
Li, Yunguo1; Vocadlo, Lidunka1; Sun, Tao2; Brodholt, John P.1,3 | |
2020-05-18 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2020 |
卷号 | 13期号:6页码:453-+ |
文章类型 | Article |
语种 | 英语 |
国家 | England; Peoples R China; Norway |
英文摘要 | The Earth's core may host most of the planet's water inventory, according to calculations of the partitioning behaviour of water at conditions of core formation. Current estimates of the budget and distribution of water in the Earth have large uncertainties, most of which are due to the lack of information about the deep Earth. Recent studies suggest that the Earth could have gained a considerable amount of water during the early stages of its evolution from the hydrogen-rich solar nebula, and that a large amount of the water in the Earth may have partitioned into the core. Here we calculate the partitioning of water between iron and silicate melts at 20-135 GPa and 2,800-5,000 K, using ab initio molecular dynamics and thermodynamic integration techniques. Our results indicate a siderophile nature of water at core-mantle differentiation and core-mantle boundary conditions, which weakens with increasing temperature; nevertheless, we found that water always partitions strongly into the iron liquid under core-formation conditions for both reducing and oxidizing scenarios. The siderophile nature of water was also verified by an empirical-counting method that calculates the distribution of hydrogen in an equilibrated iron and silicate melt. We therefore conclude that the Earth's core may act as a large reservoir that contains most of the Earth's water. In addition to constraining the accretion models of volatile delivery, the findings may partially account for the low density of the Earth's core implied by measured seismic velocities. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000533834500001 |
WOS关键词 | LOWER-MANTLE ; HYDROGEN ; EVOLUTION ; ALLOYS ; IRON ; LIQUID ; OCEAN ; BASE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
URL | 查看原文 |
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/267647 |
专题 | 地球科学 气候变化 |
作者单位 | 1.UCL, Dept Earth Sci, London, England; 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Key Lab Computat Geodynam, Beijing, Peoples R China; 3.Univ Oslo, Ctr Earth Evolut & Dynam, Oslo, Norway |
推荐引用方式 GB/T 7714 | Li, Yunguo,Vocadlo, Lidunka,Sun, Tao,et al. The Earth's core as a reservoir of water[J]. NATURE GEOSCIENCE,2020,13(6):453-+. |
APA | Li, Yunguo,Vocadlo, Lidunka,Sun, Tao,&Brodholt, John P..(2020).The Earth's core as a reservoir of water.NATURE GEOSCIENCE,13(6),453-+. |
MLA | Li, Yunguo,et al."The Earth's core as a reservoir of water".NATURE GEOSCIENCE 13.6(2020):453-+. |
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