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DOI | 10.1073/pnas.1718557115 |
Effects of iron on the lattice thermal conductivity of Earth's deep mantle and implications for mantle dynamics | |
Hsieh, Wen-Pin1; Deschamps, Frederic1; Okuchi, Takuo2; Lin, Jung-Fu3 | |
2018-04-17 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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ISSN | 0027-8424 |
出版年 | 2018 |
卷号 | 115期号:16页码:4099-4104 |
文章类型 | Article |
语种 | 英语 |
国家 | Taiwan; Japan; USA |
英文摘要 | Iron may critically influence the physical properties and thermochemical structures of Earth's lower mantle. Its effects on thermal conductivity, with possible consequences on heat transfer and mantle dynamics, however, remain largely unknown. We measured the lattice thermal conductivity of lower-mantle ferropericlase to 120 GPa using the ultrafast optical pump-probe technique in a diamond anvil cell. The thermal conductivity of ferropericlase with 56% iron significantly drops by a factor of 1.8 across the spin transition around 53 GPa, while that with 8-10% iron increases monotonically with pressure, causing an enhanced iron substitution effect in the low-spin state. Combined with bridgmanite data, modeling of our results provides a self-consistent radial profile of lower-mantle thermal conductivity, which is dominated by pressure, temperature, and iron effects, and shows a twofold increase from top to bottom of the lower mantle. Such increase in thermal conductivity may delay the cooling of the core, while its decrease with iron content may enhance the dynamics of large low shear-wave velocity provinces. Our findings further show that, if hot and strongly enriched in iron, the seismic ultralow velocity zones have exceptionally low conductivity, thus delaying their cooling. |
英文关键词 | ferropericlase thermal conductivity geodynamics large low shear-wave velocity provinces ultralow velocity zones |
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:000430191900054 |
WOS关键词 | ULTRALOW-VELOCITY ZONES ; RADIATIVE CONDUCTIVITY ; OPTICAL-ABSORPTION ; POST-PEROVSKITE ; HEAT-FLOW ; CORE ; BOUNDARY ; FERROPERICLASE ; TRANSITION ; TEMPERATURE |
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/204899 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Acad Sinica, Inst Earth Sci, Taipei 11529, Taiwan; 2.Okayama Univ, Inst Planetary Mat, Misasa, Tottori 6820193, Japan; 3.Univ Texas Austin, Dept Geol Sci, Jackson Sch Geosci, Austin, TX 78712 USA |
推荐引用方式 GB/T 7714 | Hsieh, Wen-Pin,Deschamps, Frederic,Okuchi, Takuo,et al. Effects of iron on the lattice thermal conductivity of Earth's deep mantle and implications for mantle dynamics[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2018,115(16):4099-4104. |
APA | Hsieh, Wen-Pin,Deschamps, Frederic,Okuchi, Takuo,&Lin, Jung-Fu.(2018).Effects of iron on the lattice thermal conductivity of Earth's deep mantle and implications for mantle dynamics.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(16),4099-4104. |
MLA | Hsieh, Wen-Pin,et al."Effects of iron on the lattice thermal conductivity of Earth's deep mantle and implications for mantle dynamics".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.16(2018):4099-4104. |
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