globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2017.11.051
Scopus记录号: 2-s2.0-85044339688
论文题名:
Water distribution in the lower mantle: Implications for hydrolytic weakening
作者: Muir J.M.R.; Brodholt J.P.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 484
起始页码: 363
结束页码: 369
语种: 英语
英文关键词: bridgmanite deformation ; hydrolytic weakening ; lower mantle ; water
Scopus关键词: Minerals ; Perovskite ; Rheology ; Water ; Water supply systems ; Earth's lower mantle ; First principles method ; High water content ; Hydrolytic weakening ; Lower mantle ; Lower mantle condition ; Rheological property ; Water distributions ; Water absorption
英文摘要: The presence of water in lower mantle minerals is thought to have substantial effects on the rheological properties of the Earth's lower mantle in what is generally known as “hydrolytic weakening”. This weakening will have profound effects on global convection, but hydrolytic weakening in lower mantle minerals has not been observed experimentally and thus the effect of water on global dynamics remains speculative. In order to constrain the likelihood of hydrolytic weakening being important in the lower mantle, we use first principles methods to calculate the partitioning of water (strictly protons) between mineral phases of the lower mantle under lower mantle conditions. We show that throughout the lower mantle water is primarily found either in the minor Ca-perovskite phase or in bridgmanite as an Al3+–H+ pair. Ferropericlase remains dry. However, neither of these methods of water absorption creates additional vacancies in bridgmanite and thus the effect of hydrolytic weakening is likely to be small. We find that water creates significant number of vacancies in bridgmanite only at the deepest part of the lower mantle and only for very high water contents (>1000 ppm). We conclude that water is thus likely to have only a limited effect on the rheological properties of the lower mantle. © 2017 The Authors
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110050
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Department of Earth Sciences, University College London, Gower Street, London, WC1E 6BT, United Kingdom

Recommended Citation:
Muir J.M.R.,Brodholt J.P.. Water distribution in the lower mantle: Implications for hydrolytic weakening[J]. Earth and Planetary Science Letters,2018-01-01,484
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