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1993 Fiscal Year Final Research Report Summary

Study on deep structure and dynamics of the mantle by calorimetric measurements of high pressure silicates

Research Project

Project/Area Number 03453058
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 鉱物学(含岩石・鉱床学)
Research InstitutionGakushuin University

Principal Investigator

AKAOGI Masaki  Faculty of Sci., Dept. of Chemistry, Prof., 理学部, 教授 (30126560)

Co-Investigator(Kenkyū-buntansha) NAGASAWA Hiroshi  Faculty of Sci., Dept. of Chemistry, Prof., 理学部, 教授 (80080464)
SUZUKI Toshihiro  Faculty of Sci., Dept. of Chemistry, Research Assoc., 理学部, 助手 (40235974)
Project Period (FY) 1991 – 1993
KeywordsMantle / High pressure / Calorimetry / Phase transition / Element Partition / Enthalpy / Heat capacity / Perovskite
Research Abstract

Main research results of this project are as follows.
1. Heat capacity and enthalpy of MgSi0_3 perovskite were mesured, using the perovskite sample synthesized at very high pressure and high temperature. Based on the measured thermo dynamic properties, phase boundary of dissoication of Mg_2SiO_4 spinel to MgSiO_3 perovskite plas MgO was precisely determined. The slope of the boundry suggests that the upper mantle and lower mantle convect separatery but intermittant convection occurs between them. An adiabatic geotherm in the lower mantle and the temperature at the lowermost mantle were estimated, using the heat capacity of MgSiO_3 perovskite.
2. Transition enthalpy of MgSiO_3 garnet was measured using the sampie synthesized at very high pressure and high temperature, and the phase equiliblium boundar were calculated. It eas suggetsed from the phase diagram that the garnet-perovskite transition which occurs in the descending lithoshere promotes the subduction.
3. Effect of pressure was observed on the partition coefficients of Ni, Mn and Co between metallic iron and silicates at high pressure and hgih temparature. This result suggests that the pressure effect should be incoporated in geochemical model of the core-mantle separation.
Enthalpy measurements of MgSio_4-Fe_2SiO_4 olivine solid solution showed that nonideality of the olivine solid solution was symmteric with to respect to composition and the nonideality parameter was detemined.
5. Stability fields of hollandite solid solution in the system KAISi_3O_8-NaAISi_3O_8 and of a new hexagonal(Mg, Ca)AI_2O_4 phase were detemined at high pressure and high temparature.
These aluminous phases may be stable in the transition zone and the lower mantle.

  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] Akaogi,M.: "High-pressure high-temperature stability of αPbO_2-type TiO_2 and MgSiO_3 majorite" High-Pressure Research:Application to Earth and Planetary Sciences. 447-455 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Akaogi,M.: "Heat capacity of MgSiO_3 perovskite" Geophys.Res.Lett.20. 105-108 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yusa,H.: "Calorimetric study of MgSiO_3 garnet and pyroxene" J.Geophys.Res.98. 6453-6460 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Akaogi,M.: "Refinement of enthalpy measurement of MgSiO_3 perovskite and negative pressure-temperature slopes" Geophys.Res.Lett.20. 1839-1842 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kojitani,H.: "Calorimetric study of olivine solid solutions in the system Mg_2SiO_4-Fe_2SiO_4" Phys.Chem.Minerals. (in press). (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Suzuki,T.: "Pressure effect on Mn,Co and Ni partitioning between iron hydride and mantle minerals" Proc.Japan Acad.(in press). (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Akagi, M.and Yamazaki, T: "Bridgman anvil with a sintered diamond core for phase transformation studies at high pressures and temperatures." Proc. Japan Acad.67. 61-65 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] McMillan, P.F., Akagi, M., Sato, R.K., Poe, B.and Foley, J.: "hydroxyl groups in beta -Mg_2 SiO_4." Amer. Mineral.76. 354-360 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Akagi, M., Kusaba, K., Susaki, J., Yagi, T., Matsui, M., Kikegawa, T., Yusa, H.and Ito, E.: "High-pressure high-temperature stability of alpha PbO_2 -type TiO_2 and MgSiO_3 majorite : calorimetric and in situ x-ray diffraction studies." High-Pressure Research : Application to Earth and Planetary Sciences. 447-455 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Suzuki, T., Akimoto, S.and Yagi, T.: "Metal-silicate-water reaction under high pressure. II.Partitioning of Fe, Ni and Co between metal and silicate." Phys. Earth Planet. Inter.69. 163-175 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yagi, T., Uchiyama, Y., Akaogi, M., and Ito, E.: "Isothermal compression of MgSiO_3 tetragonal garnet." Phys. Earth Planet. Inter.74. 1-7 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Akagi, M.and Ito, E.: "Heat capacity of MgSiO_3 perovskite." Geophys. REs. Lett.20. 105-108 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yusa, H., Akaogi, M., and Ito, E.: "Calorimetric study of MgSiO_3 garnet and pyroxene : heat capacities, transition enthalpies, and equilibrium phase relations in MgSiO_3 at high pressures and temperatures." J.Geophys. Res.98. 6453-6460 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Akaogi, M.and Ito, E.: "Refinement of enthalpy measurement of MgSiO_3 perovskite and negative pressure-temperature slopes for perovskite forming reactions." Geophys. Res. Lett.20. 1839-1842 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kojitani, H.and Akaogi, M.: "Calorimetric study of olivine solid solutions in the system Mg_2SiO_4 -Fe_2SiO_4." Phys. Chem. Minerals. in press. (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yagi, A., Suzuki, T.and Akaogi, M.: "High pressure transitions in the system KAl Si_3O_8 -NaAlSi_3O_8." Phys. Chem. minerals. in press. (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Suzuki, T., Akaogi, M.and Yagi, T.: "Pressure effect on Mn, Co and Ni partitioning beween iron hydride and mantle minerals." Proc. Japan Acad.in press. (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Morioka, M.and Nagasawa, H.: "Ionic diffusion in olivine." Diffusion, Atomic Ordering, and Mass Transport, Adv. Phys. Geochem.8. 176-197 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Suzuki, K., Kouta, H., and Nagasawa, H.: "Hf-Zr interdiffusion in single crystal zircon" Geochem. J.26. 99-104 (1992)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1995-03-27  

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