globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.05.003
Scopus记录号: 2-s2.0-85047013496
论文题名:
Phase stability and thermal equation of state of δ-AlOOH: Implication for water transportation to the Deep Lower Mantle
作者: Duan Y.; Sun N.; Wang S.; Li X.; Guo X.; Ni H.; Prakapenka V.B.; Mao Z.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 494
起始页码: 92
结束页码: 98
语种: 英语
英文关键词: dehydration ; thermal equation of state ; ULVZ ; water ; δ-AlOOH
Scopus关键词: Dehydration ; Melting ; Phase stability ; Silicates ; Structural geology ; Velocity ; Water ; X ray diffraction ; AlOOH ; Lowermost mantle ; Synchrotron x ray diffraction ; Temperature conditions ; Thermal equation of state ; Ultralow velocity zone ; ULVZ ; Water transportation ; Equations of state ; dehydration ; equation of state ; lower mantle ; partial melting ; transition zone ; water flow
英文摘要: In this study, we present new experimental constraints on the phase stability and thermal equation of state of an important hydrous phase, δ-AlOOH, using synchrotron X-ray diffraction up to 142 GPa and 2500 K. Our experimental results have shown that δ-AlOOH remains stable at the whole mantle pressure–temperature conditions above the D″ layer yet will decompose at the core–mantle boundary because of a dramatic increase in temperature from the silicate mantle to the metallic outer core. At the bottom transition zone and top lower mantle, the formation of δ-AlOOH by the decomposition of phase Egg is associated with a ∼2.1–2.5% increase in density (ρ) and a ∼19.7–20.4% increase in bulk sound velocity (VΦ). The increase in ρ across the phase Egg to δ-AlOOH phase transition can facilitate the subduction of δ-AlOOH to the lower mantle. Compared to major lower-mantle phases, δ-AlOOH has the lowest ρ but greatest VΦ, leading to an anomalous low ρ/VΦ ratio which can help to identify the potential presence of δ-AlOOH in the region. More importantly, water released from the breakdown of δ-AlOOH at the core–mantle boundary could lower the solidus of the pyrolitic mantle to cause partial melting and/or react with Fe in the region to form the low-velocity FeO2Hx phase. The presence of partial melting and/or the accumulation of FeO2Hx phase at the CMB could be the cause for the ultra-low velocity zone. δ-AlOOH is thus an important phase to transport water to the lowermost mantle and helps to understand the origin of the ultra-low velocity zone. © 2018 The Authors
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109853
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: Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Planetary Sciences, University of Science and Technology of China, Hefei, China; CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; Center for Advanced Radiation Sources, University of Chicago, Chicago, IL, United States

Recommended Citation:
Duan Y.,Sun N.,Wang S.,et al. Phase stability and thermal equation of state of δ-AlOOH: Implication for water transportation to the Deep Lower Mantle[J]. Earth and Planetary Science Letters,2018-01-01,494
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