Flotation of Olivine in the Peridotite Melt at High Pressure.

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概要

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• We have conducted experiments to measure the density of the FeO rich peridotite melt up to 8GPa. The San Carlos olivine with a composition Fo90 floats in the peridotite melt at 8GPa. Pure forsterite floats and the San Carlos olivine sinks, whereas the Fo95 olivine is neutrally buoyant in the peridotite melt at 6GPa. This result implies that the density crossover between the FeO rich peridotite melt and the equilibrating olivine exists at around 7GPa. Since the FeO rich peridotite is similar to the Martian mantle composition proposed by Morgan and Anders (1979), present experiments clearly implies that the density crossover does exist in the Martian interior at the depths around 600km. We also conducted a buoyancy test for the pyrollite melt. Olivine with the Fo95 composition sinks in the melt at 8GPa. This result together with that of the FeO rich peridotite melt implies that the density crossover will exist at the pressure around 12GPa in the magma with the terrestrial mantle composition.

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著者

• Ohtani Eiji

  Institute Of Mineralogy Petrology And Economic Geology Faculty Of Science Tohoku University

• Suzuki Akio

  Institute Of Mechanical Systems Engineering National Institute Of Advanced Science And Technology

• OHTANI Eiji

  Institute of Mineralogy, Petrology and Economic Geology, Tohoku University

• KATO Takumi

  Institute of Mineralogy, Petrology and Economic Geology, Tohoku University

• KATO Takumi

  Institute of Geosciences, University of Tsukuba

関連論文

• X-ray diffraction study of high pressure transition in InOOH
• Pressure dependence of u parameter in ringwoodite up to 7.9GPa
• Cation vacancies and possible hydrogen atom positions in Fe-bearing hydrous forsterite, Mg_Fe_Si_H_O_4, synthesized at 13.5GPa and 1400℃
• Stability of dense hydrous magnesium silicate phase G in the transition zone and the lower mantle
• Raman spectroscopic study of a garnetite xenolith from Malaita, Southwest Pacific
• Application of FIB system to ultra-high-pressure Earth science
• Simulation of Multi-dimensional Heterogeneous and Intermittent Two-Phase Flow by Using an Extended Two-Fluid Model
• Pressure dependence of u parameter in ringwoodite up to 7.9 GPa
• Flotation of Olivine in the Peridotite Melt at High Pressure.
• Origin of Cratonic Peridotite and Komatiite: Evidence for Melting in the Wet Archean Mantle.:Evidence for Melting in the Wet Archean Mantle

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