量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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Acoustic wave velocities of ferrous-bearing MgSiO3 glass up to 158 GPa with 2 implications for dense silicate melts at the base of the Earth’s mantle
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We conducted in-situ high-pressure acoustic wave velocitymeasurements of Fe2+-bearing MgSiO3 glass up to 158 GPaby means of Brillouin scattering spectroscopy to understand the effect of iron on silicate melt in the lower mantle.Thechange in trend of the velocity profile, likely induced by the structural transition in Si-O coordination numberproposedin previous studies of silicate glasses, is also observed around 129 GPa. The transition pressurebecomes 125-128 GPa when considering the iron content of melts in a pyrolitic or chondritic mantle, whichis lower than the pressures of the CMB and the ULVZs. Our datashowthe substitution of 12mol% Fe in MgSiO3 glass decreases the VS by ~5.5 %. This study implies that iron considerably affect onthe buoyancy relations between melts/crystals and the iron-bearing melts at the lowermost mantle will have thehigher coordination numberthan sixfold.
Acoustic wave velocities of ferrous-bearing MgSiO3 glass up to 158 GPa with 2 implications for dense silicate melts at the base of the Earth’s mantle
