Presentation Information
[R3P-07]Water contents of magma as functions of
pressure and temperature at the uppermost lower mantle
*OKUMURA KOTA1, Toru INOUE1, Sho KAKIZAWA1, Masamichi NODA1, Takaaki KAWAZOE1, Tomoko SATO1, Toru SHINMEI2, Tetsuo IRIFUNE2 (1. Hiroshima Univ. Adv. Sci. Eng., 2. Ehime Uni. GRC)
Keywords:
Water content in magma,Phase diagram,Uppermost lower mantle
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We clarified the water content of magma generated at the uppermost lower mantle condition. The experimental conditions were at 25 GPa and 1200-1700℃. When we adopted the mantle temperature at 1650℃, the water content was estimated to be about 23 wt% from our determined liquidus line. Considering the density of magma as a function of water content, it is concluded that the hydrous magma generated at the uppermost lower mantle condition should be gravitationally unstable.
We clarified the water content of magma generated at the uppermost lower mantle condition. The experimental conditions were at 25 GPa and 1200-1700℃. When we adopted the mantle temperature at 1650℃, the water content was estimated to be about 23 wt% from our determined liquidus line. Considering the density of magma as a function of water content, it is concluded that the hydrous magma generated at the uppermost lower mantle condition should be gravitationally unstable.