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DOI | 10.1002/2017GL075283 |
Insufficient Energy From MgO Exsolution to Power Early Geodynamo | |
Du, Zhixue1; Jackson, Colin1,2; Bennett, Neil1; Driscoll, Peter3; Deng, Jie4; Lee, Kanani K. M.4; Greenberg, Eran5; Prakapenka, Vitali B.5; Fei, Yingwei1 | |
2017-11-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:22 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The origin of Earth's ancient magnetic field is an outstanding problem. It has recently been proposed that exsolution of MgO from the core may provide sufficient energy to drive an early geodynamo. Here we present new experiments on Mg partitioning between iron-rich liquids and silicate/oxide melts. Our results indicate that Mg partitioning depends strongly on the oxygen content in the iron-rich liquid, in contrast to previous findings that it depends only on temperature. Consequently, MgO exsolution during core cooling is drastically reduced and insufficient to drive an early geodynamo alone. Using the new experimental data, our thermal model predicts inner core nucleation at similar to 850 Ma and a nearly constant paleointensity. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000419102300018 |
WOS关键词 | EARTHS CORE CONDITIONS ; PARTITIONING EXPERIMENTS ; MAGNESIUM PRECIPITATION ; ELECTRICAL-RESISTIVITY ; THERMAL-CONDUCTIVITY ; EVOLUTION ; IRON ; POTASSIUM ; INTENSITY ; FIELD |
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/25967 |
专题 | 气候变化 |
作者单位 | 1.Carnegie Inst Sci, Geophys Lab, Washington, DC USA; 2.Smithsonian Inst, Natl Museum Nat Hist, Washington, DC 20560 USA; 3.Carnegie Inst Sci, Dept Terr Magnetism, Washington, DC USA; 4.Yale Univ, Dept Geol & Geophys, New Haven, CT USA; 5.Univ Chicago, Ctr Adv Radiat Sources, Chicago, IL 60637 USA |
推荐引用方式 GB/T 7714 | Du, Zhixue,Jackson, Colin,Bennett, Neil,et al. Insufficient Energy From MgO Exsolution to Power Early Geodynamo[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(22). |
APA | Du, Zhixue.,Jackson, Colin.,Bennett, Neil.,Driscoll, Peter.,Deng, Jie.,...&Fei, Yingwei.(2017).Insufficient Energy From MgO Exsolution to Power Early Geodynamo.GEOPHYSICAL RESEARCH LETTERS,44(22). |
MLA | Du, Zhixue,et al."Insufficient Energy From MgO Exsolution to Power Early Geodynamo".GEOPHYSICAL RESEARCH LETTERS 44.22(2017). |
条目包含的文件 | 条目无相关文件。 |
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