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- W3112827823 abstract "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 (), which dominates its gravitational stability and melt fraction, remains poorly constrained. Here, the of hydrous silicate melt by mass balance calculations is investigated and found that 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." @default.
- W3112827823 created "2020-12-21" @default.
- W3112827823 creator A5028718872 @default.
- W3112827823 date "2021-01-09" @default.
- W3112827823 modified "2023-10-15" @default.
- W3112827823 title "Water Content of the Dehydration Melting Layer in the Topmost Lower Mantle" @default.
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- W3112827823 doi "https://doi.org/10.1029/2020gl090973" @default.
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