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- W2579653532 abstract "Abstract While it is accepted that silica‐rich melts behave anomalously with a decrease of their viscosity at increased pressures ( P ), the viscosity of silica‐poor melts is much less constrained. However, modeling of mantle melts dynamics throughout Earth's history, including the magma ocean era, requires precise knowledge of the viscous properties of silica‐poor magmas. We extend here our previous measurements on fayalite melt to natural end‐members pyroxenite melts (MgSiO 3 and CaSiO 3 ) using in situ X‐ray radiography up to 8 GPa. For all compositions, viscosity decreases with P , rapidly below 5 GPa and slowly above. The magnitude of the viscosity decrease is larger for pyroxene melts than for fayalite melt and larger for the Ca end‐member within pyroxene melts. The anomalous viscosity decrease appears to be a universal behavior for magmas up to 13 GPa, while the P dependence of viscosity beyond this remains to be measured. These results imply that mantle melts are very pervasive at depth." @default.
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- W2579653532 date "2017-01-28" @default.
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- W2579653532 title "Viscosity of mafic magmas at high pressures" @default.
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- W2579653532 doi "https://doi.org/10.1002/2016gl071600" @default.
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