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DOI | 10.1038/s41467-020-17106-7 |
Low thermal conductivity of iron-silicon alloys at Earth's core conditions with implications for the geodynamo | |
Hsieh, Wen-Pin1,2; Goncharov, Alexander F.3,4,5; Labrosse, Stephane6; Holtgrewe, Nicholas7; Lobanov, Sergey S.8; Chuvashova, Irina; Deschamps, Frederic1; Lin, Jung-Fu9 | |
2020-07-03 | |
发表期刊 | NATURE COMMUNICATIONS |
ISSN | 2041-1723 |
出版年 | 2020 |
卷号 | 11期号:1 |
文章类型 | Article |
语种 | 英语 |
国家 | Taiwan; Peoples R China; USA; France; Germany |
英文摘要 | Earth's core is composed of iron (Fe) alloyed with light elements, e.g., silicon (Si). Its thermal conductivity critically affects Earth's thermal structure, evolution, and dynamics, as it controls the magnitude of thermal and compositional sources required to sustain a geodynamo over Earth's history. Here we directly measured thermal conductivities of solid Fe and Fe-Si alloys up to 144GPa and 3300K. 15 at% Si alloyed in Fe substantially reduces its conductivity by about 2 folds at 132GPa and 3000K. An outer core with 15 at% Si would have a conductivity of about 20Wm(-1) K-1, lower than pure Fe at similar pressure-temperature conditions. This suggests a lower minimum heat flow, around 3 TW, across the core-mantle boundary than previously expected, and thus less thermal energy needed to operate the geodynamo. Our results provide key constraints on inner core age that could be older than two billion-years. Thermal conductivity of Earth's core affects Earth's thermal structure, evolution and dynamics. Based on thermal conductivity measurements of iron-silicon alloys at high pressure and temperature conditions, the authors here propose Earth's inner core could be older than previously expected. |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000546623500032 |
WOS关键词 | FE-NI ALLOYS ; ELECTRICAL-RESISTIVITY ; HIGH-PRESSURE ; SOLID IRON ; MAGNESIUM PRECIPITATION ; SI ALLOY ; EVOLUTION ; STATE ; BOUNDARY |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
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/281812 |
专题 | 资源环境科学 |
作者单位 | 1.Acad Sinica, Inst Earth Sci, Taipei 11529, Taiwan; 2.Natl Taiwan Univ, Dept Geosci, Taipei 10617, Taiwan; 3.Inst Solid State Phys CAS, Key Lab Mat Phys, Hefei 230031, Peoples R China; 4.Carnegie Inst Sci, Earth & Planets Lab, Washington, DC 20015 USA; 5.Univ Paris, Inst Phys Globe Paris, F-75005 Paris, France; 6.Univ Lyon 1, Univ Lyon, ENSL, CNRS,LGL TPE, F-69007 Lyon, France; 7.Howard Univ, Dept Math, Washington, DC 20059 USA; 8.GFZ German Res Ctr Geosci, D-14473 Potsdam, Germany; 9.Univ Texas Austin, Jackson Sch Geosci, Dept Geol Sci, Austin, TX 78712 USA |
推荐引用方式 GB/T 7714 | Hsieh, Wen-Pin,Goncharov, Alexander F.,Labrosse, Stephane,et al. Low thermal conductivity of iron-silicon alloys at Earth's core conditions with implications for the geodynamo[J]. NATURE COMMUNICATIONS,2020,11(1). |
APA | Hsieh, Wen-Pin.,Goncharov, Alexander F..,Labrosse, Stephane.,Holtgrewe, Nicholas.,Lobanov, Sergey S..,...&Lin, Jung-Fu.(2020).Low thermal conductivity of iron-silicon alloys at Earth's core conditions with implications for the geodynamo.NATURE COMMUNICATIONS,11(1). |
MLA | Hsieh, Wen-Pin,et al."Low thermal conductivity of iron-silicon alloys at Earth's core conditions with implications for the geodynamo".NATURE COMMUNICATIONS 11.1(2020). |
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