期刊
GEOPHYSICAL RESEARCH LETTERS
卷 47, 期 13, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020GL087607
关键词
hydrous ringwoodite; lattice thermal conductivity; mantle transition zone; water cycle
资金
- DFG [GRK 2156/1]
- JSPS Japanese-German graduate externship
- Academia Sinica
- Ministry of Science and Technology (MOST) of Taiwan, Republic of China [AS-CDA-106-M02, 1072628-M-001-004-MY3]
- Alexander von Humboldt Postdoctoral Fellowship
- German Research Foundation (DFG) [IS350/1-1]
- Bayerisches Geoinstitut Visitor's Program
- Japan Society for the Promotion of Science [JP15H05748]
- Alexander von Humboldt foundation
- Foundation for the Advancement of Outstanding Scholarship, Taiwan
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.
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