气候变化领域集成服务门户(CCPortal): Bridgmanite is nearly dry at the top of the lower mantle

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DOI	10.1016/j.epsl.2021.117088
	Bridgmanite is nearly dry at the top of the lower mantle
	Liu Z.; Fei H.; Chen L.; McCammon C.; Wang L.; Liu R.; Wang F.; Liu B.; Katsura T.
发表日期	2021
ISSN	0012821X
卷号	570
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.
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203194
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
推荐引用方式 GB/T 7714	Liu Z.,Fei H.,Chen L.,et al. Bridgmanite is nearly dry at the top of the lower mantle[J],2021,570.
APA	Liu Z..,Fei H..,Chen L..,McCammon C..,Wang L..,...&Katsura T..(2021).Bridgmanite is nearly dry at the top of the lower mantle.Earth and Planetary Science Letters,570.
MLA	Liu Z.,et al."Bridgmanite is nearly dry at the top of the lower mantle".Earth and Planetary Science Letters 570(2021).