globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.117088
论文题名:
Bridgmanite is nearly dry at the top of the lower mantle
作者: Liu Z.; Fei H.; Chen L.; McCammon C.; Wang L.; Liu R.; Wang F.; Liu B.; Katsura T.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 570
语种: 英语
中文关键词: bridgmanite ; dry ; lower mantle ; single crystal ; water solubility
英文关键词: Crystal structure ; Fourier transform infrared spectroscopy ; Magnesia ; Single crystals ; 'Dry' [ ; Bridgmanite ; High Pressure and High Temperature conditions ; High quality single crystals ; Hydrous melts ; Lower mantle ; MgO ; Nonstoichiometric ; Synthesised ; Water solubilities ; Solubility ; crystal structure ; high pressure ; high temperature ; lower mantle ; mineral ; solubility
英文摘要: Water solubility in the dominant lower-mantle bridgmanite phase remains controversial. Discrepancies between previous results highlight the importance of the growth high-quality single crystals of bridgmanite under high-pressure and high-temperature conditions corresponding to the top of the lower mantle. Here we synthesized high-quality single crystals of aluminous bridgmanite up to 300 μm in size that were saturated with hydrous melt at 24–26 GPa and 1700–1900 K using both stoichiometric and MgO-rich non-stoichiometric hydrous starting materials in a multi-anvil press. Fourier-transform infrared spectroscopy measurements on clear and pure spots of the single-crystal bridgmanites did not detect any pronounced OH-stretching bands, which were prominent in some earlier studies. The present results support that the lower-mantle dominated bridgmanite is nearly dry, at least at the top of the lower mantle, and that Al3+ and Fe3+ cannot enhance water incorporation into the crystal structure even in the presence of oxygen vacancies. Large partition coefficients of water between transition-zone minerals and dry lower-mantle dominated bridgmanite further support dehydration melting at the top of the lower mantle. We suggest that the majority of the top of a pyrolitic lower mantle is nearly dry based on the dry principal minerals and stability of hydrous phases in this region. © 2021 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165572
Appears in Collections:气候变化与战略

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作者单位: Bayerisches Geoinstitut, University of Bayreuth, Bayreuth, 95440, Germany; State Key Laboratory of Superhard Materials, Jilin University, Changchun, 130012, China; Synergetic Extreme Condition User Facility, Jilin University, Changchun, 130012, China; Center for High Pressure Science & Technology Advanced Research, Beijing, 100094, China

Recommended Citation:
Liu Z.,Fei H.,Chen L.,et al. Bridgmanite is nearly dry at the top of the lower mantle[J]. Earth and Planetary Science Letters,2021-01-01,570
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