Phase stability and thermal equation of state of δ-AlOOH: Implication for water transportation to the Deep Lower Mantle

地幔(地质学) 过渡带 核幔边界 俯冲 地幔楔 索里达 地质学 部分熔融 外堆芯 硅酸盐 地幔对流 地球物理学 热力学 材料科学 内芯 化学 物理 构造学 复合材料 古生物学 有机化学 合金
作者
Yunfei Duan,Ningyu Sun,Siheng Wang,Xinyang Li,Xuan Guo,Huaiwei Ni,Vitali B. Prakapenka,Zhu Mao
出处
期刊:Earth and Planetary Science Letters [Elsevier BV]
卷期号:494: 92-98 被引量:47
标识
DOI:10.1016/j.epsl.2018.05.003
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.
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