气候变化领域集成服务门户(CCPortal): Spin Transition of Iron in δ-(Al;Fe)OOH Induces Thermal Anomalies in Earth's Lower Mantle

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DOI	10.1029/2020GL087036
	Spin Transition of Iron in δ-(Al;Fe)OOH Induces Thermal Anomalies in Earth's Lower Mantle
	Hsieh W.-P.; Ishii T.; Chao K.-H.; Tsuchiya J.; Deschamps F.; Ohtani E.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:4
英文摘要	Seismic anomalies observed in Earth's deep mantle are conventionally considered to be associated with thermal and compositional anomalies, and possibly partial melt of major lower-mantle phases. However, through deep water cycle, impacts of hydrous minerals on geophysical observables and on the deep mantle thermal state and geodynamics remain poorly understood. Here we precisely measured thermal conductivity of δ-(Al,Fe)OOH, an important water-carrying mineral in Earth's deep interior, to lowermost mantle pressures at room temperature. The thermal conductivity varies drastically by twofold to threefold across the spin transition of iron, resulting in an exceptionally low thermal conductivity at the lowermost mantle conditions. As δ-(Al,Fe)OOH is transported to the lowermost mantle, its exceptionally low thermal conductivity may serve as a local thermal insulator, promoting high-temperature anomalies and the formation of partial melt and thermal plumes at the base of the mantle, strongly influencing thermo-chemical profiles in the region and fate of Earth's deep water cycle. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Geodynamics; Iron; Minerals; Deep water cycles; Earth's lower mantle; High-temperature anomalies; Hydrous mineral; Low thermal conductivity; Thermal anomalies; Thermal insulators; Ultralow velocity zone; Thermal conductivity; geodynamics; geophysical method; high temperature; hydrological cycle; induced response; iron; lower mantle; mineral; partial melting; plume; thermal conductivity
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170685
作者单位	Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan; Department of Geosciences, National Taiwan University, Taipei, Taiwan; Bayerisches Geoinstitut, University of Bayreuth, Bayreuth, Germany; Geodynamics Research Center, Ehime University, Matsuyama, Japan; Department of Earth Science, Graduate School of Science, Tohoku University, Sendai, Japan
推荐引用方式 GB/T 7714	Hsieh W.-P.,Ishii T.,Chao K.-H.,et al. Spin Transition of Iron in δ-(Al;Fe)OOH Induces Thermal Anomalies in Earth's Lower Mantle[J],2020,47(4).
APA	Hsieh W.-P.,Ishii T.,Chao K.-H.,Tsuchiya J.,Deschamps F.,&Ohtani E..(2020).Spin Transition of Iron in δ-(Al;Fe)OOH Induces Thermal Anomalies in Earth's Lower Mantle.Geophysical Research Letters,47(4).
MLA	Hsieh W.-P.,et al."Spin Transition of Iron in δ-(Al;Fe)OOH Induces Thermal Anomalies in Earth's Lower Mantle".Geophysical Research Letters 47.4(2020).