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| DOI | 10.1029/2020GL090973 |
| Water Content of the Dehydration Melting Layer in the Topmost Lower Mantle | |
| Fei H. | |
| 发表日期 | 2021 |
| ISSN | 0094-8276 |
| 卷号 | 48期号:1 |
| 英文摘要 | The water-rich mantle transition zone and dry lower mantle suggest that a dehydration melting layer can form at the 660-km depth boundary. However, the water content of the melting layer ((Formula presented.)), which dominates its gravitational stability and melt fraction, remains poorly constrained. Here, the (Formula presented.) of hydrous silicate melt by mass balance calculations is investigated and found that (Formula presented.) significantly decreases with increasing temperature, but is relatively insensitive to chemical composition (FeO and SiO2 contents) and coexisting phases. Melt at 660-km depth should contain ∼50 wt.% water at 1600 K (slab geotherm) or ∼20 wt.% water at 2000 K (topmost lower mantle geotherm). The density of the hydrous melt is <3.9 g/cm3, which makes it buoyant. With a melt fraction of ≳0.5 vol.%, the melting layer is expected to significantly reduce the viscosity and seismic velocity near slabs, which may cause slab stagnation and prohibit whole mantle convection. © 2020. The Authors. |
| 英文关键词 | Dehydration; Iron oxides; Silica; Silicates; Chemical compositions; Coexisting phasis; Gravitational stabilities; Hydrous silicate melt; Increasing temperatures; Mantle transition zone; Mass-balance calculations; Seismic velocities; Melting |
| 语种 | 英语 |
| 来源期刊 | Geophysical Research Letters
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/169246 |
| 作者单位 | Bayerisches Geoinstitut, University of Bayreuth, Bayreuth, Germany |
| 推荐引用方式 GB/T 7714 | Fei H.. Water Content of the Dehydration Melting Layer in the Topmost Lower Mantle[J],2021,48(1). |
| APA | Fei H..(2021).Water Content of the Dehydration Melting Layer in the Topmost Lower Mantle.Geophysical Research Letters,48(1). |
| MLA | Fei H.."Water Content of the Dehydration Melting Layer in the Topmost Lower Mantle".Geophysical Research Letters 48.1(2021). |
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