TY - JOUR
T1 - Melting phase relations in the MgSiO 3 –CaSiO 3 system at 24 GPa
AU - Nomura, Ryuichi
AU - Zhou, Youmo
AU - Irifune, Tetsuo
N1 - Funding Information:
We thank Takashi Taniuchi (Ehime Univ.) for discussions and Dr. Toru Shinmei (Ehime Univ.), Dr. Takeshi Arimoto (Ehime Univ.), Dr. Wei Sun (Ehime Univ.), and Dr. Steeve Gréaux (Ehime Univ.) for their assistance in our experiments. We thank the editor and the anonymous reviewers for their constructive comments and suggestions. We thank Dr. Hideharu Kuwahara (Ehime Univ.) and Dr. Chie Kato (Tokyo Tech.) for their assistance in the compositional analyses. Funding This work was supported by JSPS KAKENHI Grant Numbers JP15H05470, JP15H05830, and JP25220712.
Publisher Copyright:
© The Author(s). 2017.
PY - 2017
Y1 - 2017
N2 - The Earth’s lower mantle is composed of bridgmanite, ferropericlase, and CaSiO 3 -rich perovskite. The melting phase relations between each component are key to understanding the melting of the Earth’s lower mantle and the crystallization of the deep magma ocean. In this study, melting phase relations in the MgSiO 3 –CaSiO 3 system were investigated at 24 GPa using a multi-anvil apparatus. The eutectic composition is (Mg,Ca)SiO 3 with 81–86 mol% MgSiO 3 . The solidus temperature is 2600–2620 K. The solubility of CaSiO 3 component into bridgmanite increases with temperature, reaching a maximum of 3–6 mol% at the solidus, and then decreases with temperature. The same trend was observed for the solubility of MgSiO 3 component into CaSiO 3 -rich perovskite, with a maximum of 14–16 mol% at the solidus. The asymmetric regular solutions between bridgmanite and CaSiO 3 -rich perovskite and between MgSiO 3 and CaSiO 3 liquid components well reproduce the melting phase relations constrained experimentally.
AB - The Earth’s lower mantle is composed of bridgmanite, ferropericlase, and CaSiO 3 -rich perovskite. The melting phase relations between each component are key to understanding the melting of the Earth’s lower mantle and the crystallization of the deep magma ocean. In this study, melting phase relations in the MgSiO 3 –CaSiO 3 system were investigated at 24 GPa using a multi-anvil apparatus. The eutectic composition is (Mg,Ca)SiO 3 with 81–86 mol% MgSiO 3 . The solidus temperature is 2600–2620 K. The solubility of CaSiO 3 component into bridgmanite increases with temperature, reaching a maximum of 3–6 mol% at the solidus, and then decreases with temperature. The same trend was observed for the solubility of MgSiO 3 component into CaSiO 3 -rich perovskite, with a maximum of 14–16 mol% at the solidus. The asymmetric regular solutions between bridgmanite and CaSiO 3 -rich perovskite and between MgSiO 3 and CaSiO 3 liquid components well reproduce the melting phase relations constrained experimentally.
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U2 - 10.1186/s40645-017-0149-2
DO - 10.1186/s40645-017-0149-2
M3 - Article
AN - SCOPUS:85060129010
SN - 2197-4284
VL - 4
JO - Progress in Earth and Planetary Science
JF - Progress in Earth and Planetary Science
IS - 1
M1 - 34
ER -