气候变化领域集成服务门户(CCPortal): Effect of Water on Lattice Thermal Conductivity of Ringwoodite and Its Implications for the Thermal Evolution of Descending Slabs

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DOI	10.1029/2020GL087607
	Effect of Water on Lattice Thermal Conductivity of Ringwoodite and Its Implications for the Thermal Evolution of Descending Slabs
	Marzotto E.; Hsieh W.-P.; Ishii T.; Chao K.-H.; Golabek G.J.; Thielmann M.; Ohtani E.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:13
英文摘要	The presence of water in minerals generally alters their physical properties. Ringwoodite is the most abundant phase in the lowermost mantle transition zone and can host up to 1.5–2 wt% water. We studied high-pressure lattice thermal conductivity of dry and hydrous ringwoodite by combining diamond-anvil cell experiments with ultrafast optics. The incorporation of 1.73 wt% water substantially reduces the ringwoodite thermal conductivity by more than 40% at mantle transition zone pressures. We further parameterized the ringwoodite thermal conductivity as a function of pressure and water content to explore the large-scale consequences of a reduced thermal conductivity on a slab's thermal evolution. Using a simple 1-D heat diffusion model, we showed that the presence of hydrous ringwoodite in the slab significantly delays decomposition of dense hydrous magnesium silicates, enabling them to reach the lower mantle. Our results impact the potential route and balance of water cycle in the lower mantle. © 2020. The Authors.
英文关键词	Crystal lattices; Magnesium compounds; Silicates; Structural geology; Dense hydrous magnesium silicates; Diamond-anvil cell experiments; Function of pressure; Lattice thermal conductivity; Mantle transition zone; Presence of water; Thermal evolution; Ultrafast optics; Thermal conductivity; hydrological cycle; lower mantle; ringwoodite; slab; thermal conductivity; transition zone
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/170167
作者单位	Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth, Germany; Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan; Department of Geosciences, National Taiwan University, Taipei, Taiwan; Graduate School of Science, Tohoku University, Sendai, Japan
推荐引用方式 GB/T 7714	Marzotto E.,Hsieh W.-P.,Ishii T.,et al. Effect of Water on Lattice Thermal Conductivity of Ringwoodite and Its Implications for the Thermal Evolution of Descending Slabs[J],2020,47(13).
APA	Marzotto E..,Hsieh W.-P..,Ishii T..,Chao K.-H..,Golabek G.J..,...&Ohtani E..(2020).Effect of Water on Lattice Thermal Conductivity of Ringwoodite and Its Implications for the Thermal Evolution of Descending Slabs.Geophysical Research Letters,47(13).
MLA	Marzotto E.,et al."Effect of Water on Lattice Thermal Conductivity of Ringwoodite and Its Implications for the Thermal Evolution of Descending Slabs".Geophysical Research Letters 47.13(2020).