Auflistung Geochemie, Mineralogie, Petrologie nach Mitwirkenden "Katsura, Tomoo"
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Aluminum Components in Bridgmanite Coexisting With Corundum and the CF‐Phase With Temperature
Wang, Lin; Liu, Zhaodong; Koizumi, Sanae; Ballaran, Tiziana Boffa; Katsura, Tomoo (Journal of Geophysical Research: Solid Earth, 2023-01-22)Abstract Phase relations in the MgSiO3–MgAl2O4–Al2O3 system are investigated at 27 GPa and 2000–2600 K using a multi‐anvil apparatus. The AlAlO3 content ... -
Determination of phase relations of the olivine–ahrensite transition in the Mg2SiO4–Fe2SiO4 system at 1740 K using modern multi-anvil techniques
Chanyshev, Artem; Bondar, Dmitry; Fei, Hongzhan; Purevjav, Narangoo; Ishii, Takayuki; Nishida, Keisuke; Bhat, Shrikant; Farla, Robert; Katsura, Tomoo (Contributions to Mineralogy and Petrology, 2021-09-20)The phase relations of iron-rich olivine and its high-pressure polymorphs are important for planetary science and meteoritics because these minerals are the main constituents of terrestrial mantles and meteorites. The ... -
Direct Viscosity Measurement of Peridotite Melt to Lower‐Mantle Conditions: A Further Support for a Fractional Magma‐Ocean Solidification at the Top of the Lower Mantle
Xie, Longjian; Yoneda, Akira; Katsura, Tomoo; Andrault, Denis; Tange, Yoshinori; Higo, Yuji (Geophysical Research Letters, 2021-10-05)As evidenced by isotope geochemistry, the persistence of primitive reservoirs indicates that the earth's lower mantle is likely to be heterogeneous. Such heterogeneity could be a legacy from magma‐ocean (MO) solidification. ... -
Oxygen Vacancy Ordering in Aluminous Bridgmanite in the Earth's Lower Mantle
Grüninger, Helen; Liu, Zhaodong; Siegel, Renée; Boffa Ballaran, Tiziana; Katsura, Tomoo; Senker, Jürgen; Frost, Daniel J. (Geophysical Research Letters, 2019)Oxygen vacancies (OVs), that charge-balance the replacement of octahedrally coordinated Si4+ by Al3+ in the mineral bridgmanite, will influence transport properties in the lower mantle but little is known about their ... -
Oxygen Vacancy Substitution Linked to Ferric Iron in Bridgmanite at 27 GPa
Fei, Hongzhan; Liu, Zhaodong; McCammon, Catherine; Katsura, Tomoo (Geophysical Research Letters, 2020)Ferric iron can be incorporated into the crystal structure of bridgmanite by either oxygen vacancy substitution (MgFeO2.5 component) or charge-coupled substitution (FeFeO3 component) mechanisms. We investigated the ... -
Stability and Solubility of the FeAlO3 Component in Bridgmanite at Uppermost Lower Mantle Conditions
Liu, Zhaodong; McCammon, Catherine; Wang, Biao; Dubrovinsky, Leonid; Ishii, Takayuki; Bondar, Dmitry; Nakajima, Ayano; Tange, Yoshinori; Higo, Yuji; Cui, Tian; Liu, Bingbing; Katsura, Tomoo (Journal of Geophysical Research: Solid Earth, 2020)We report the stability and solubility of the FeAlO3 component in bridgmanite based on phase relations in the system MgSiO3-FeAlO3 at 27 GPa and 2000 K using a multi-anvil apparatus combined with in situ synchrotron X-ray ... -
Water Solubility in Fe‐Bearing Wadsleyite at Mantle Transition Zone Temperatures
Wadsleyite can store significant amounts of H2O in its crystal structure as hydroxyl. However, H2O solubility in Fe‐bearing wadsleyite remains poorly constrained at mantle transition zone temperatures. Previous studies ...