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DOI | 10.1038/s41467-020-14773-4 |
A silicate dynamo in the early Earth | |
Lars Stixrude; Roberto Scipioni; Michael P. Desjarlais | |
2020-02-25 | |
发表期刊 | Nature |
出版年 | 2020 |
英文摘要 | The Earth鈥檚 magnetic field has operated for at least 3.4 billion years, yet how the ancient field was produced is still unknown. The core in the early Earth was surrounded by a molten silicate layer, a basal magma ocean that may have survived for more than one billion years. Here we use density functional theory-based molecular dynamics simulations to predict the electrical conductivity of silicate liquid at the conditions of the basal magma ocean: 100鈥?40鈥塆Pa, and 4000鈥?000鈥塊. We find that the electrical conductivity exceeds 10,000鈥塖/m, more than 100 times that measured in silicate liquids at low pressure and temperature. The magnetic Reynolds number computed from our results exceeds the threshold for dynamo activity and the magnetic field strength is similar to that observed in the Archean paleomagnetic record. We therefore conclude that the Archean field was produced by the basal magma ocean. |
领域 | 资源环境 |
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/249778 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Lars Stixrude,Roberto Scipioni,Michael P. Desjarlais. A silicate dynamo in the early Earth[J]. Nature,2020. |
APA | Lars Stixrude,Roberto Scipioni,&Michael P. Desjarlais.(2020).A silicate dynamo in the early Earth.Nature. |
MLA | Lars Stixrude,et al."A silicate dynamo in the early Earth".Nature (2020). |
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