• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Accurate determination of phase equilibrium diagrams by calorimetric measurements of high pressure silicate minerals and applications to structure of the earth's mantle.

Research Project

Project/Area Number 62540618
Research Category

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

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

Principal Investigator

AKAOGI Masaki  Kanazawa Univ. Dept. of Earth Sci. Assoc.Prof., 理学部, 助教授 (30126560)

Co-Investigator(Kenkyū-buntansha) KIHARA Kuniaki  Kanazawa Univ. Dept. of Earth Sci. Assoc.Prof., 理学部, 助教授 (70019503)
MATSUMOTO Takeo  Kanazawa Univ. Dept. of Earth Sci. Prof., 理学部, 教授 (20019467)
Project Period (FY) 1987 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1989: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1988: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1987: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsHigh pressure experiments / Calorimetry / Mantle / Phase transition / Silicate / Phase equilibrium / Enthalpy / Refinement / エンタルピー / 高圧合成 / 相平衡図 / 熱力学
Research Abstract

The important scientific results of this research project are summarized as follows.
1. Enthalpies of the olivine-modified spinel-spinel transitions in the system Mg_2SiO_4-Fe_2SiO_4 were measured by high temperature calorimetric techniques. The phase diagrams calculated form the present thermochemical data are not well consistent with those by Ringwood and Major (1970) and Kawada (1977), but agree very well with that determined with precise high pressure experiments by Katsura and Ito (1989). From the calculated phase diagrams, it is concluded that the olivine-modified spinel transition occurs at about 390-410 km in the mantle, while the modified spinel-spinel transition at about 490-540 km. Temperatures at 390 and 650 km are estimated to be 1400 and 1600 ゚C, respectively.
2. Enthalpy of the pyroxene-garnet transition in the system Mg_4Si_4O_<12>-Mg_3Al_2 Si_3O_<12> was measured by the same calorimetric techniques. The calculated phase diagram was in good agreement, with that by high pressure experiments by Akaogi and Akimoto (1977), when the pressure scale was revised. It was concluded from the phase diagram that the pyroxene-garnet transition in the mantle occurs gradually with depth in the depth range of about 300-500 km and shows no sharp seismic velocity discontinuity.
3. High pressures over 18 GPa were generated by using new Bridgman-anvils (26 mm in diameter) with sintered diamond tips. The transition of beta-Zn_2SiO_4 to ZnSiO_3 ilmenite plus ZnO was examined using these new anvils.
4. From the measured enthalpies of the pyroxene-ilmenite transition in ZnSiO_3 and of the disproportionation of Ni_2SiO_4 spinel, these phase equilibrium boundaries were calculated thermodynamically.

Report

(4 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • 1987 Annual Research Report
  • Research Products

    (35 results)

All Other

All Publications (35 results)

  • [Publications] Akaogi,M.: "Pyroxene-garnet transformation:Thermochemistry and elasticity of garnet solid solutions,and applications to a pyrolite mantle." High-Pressure Research in Mineral Physics(American Geophysical Union/Terra Sci.Publ.). 251-260 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Akaogi,M.: "Calorimetric study of high-pressure phase transitions among the CdGeO_3 polymorphs." Phy.Chem.Minerals. 14. 435-440 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Matsui,M.: "Computational model of the structural and elastic properties of the ilmenite and perovskite phases of MgSiO_3." Phys.Chem.Minerals. 14. 101-106 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Akaogi,M.: "The olivine-modified spinel-spinel transitions in the system Mg_2SiO_4-Fe_2SiO_4:calorimetric measurements,ther-mochemical calculation and geophysical application." J.Geophys.Res.94. 15671-15685 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Akaogi,M.: "The ZnSiO_3 clinopyroxene-ilmenite transition:heat capacity,enthalpy of transition and phase equilibria." Phys.Chem.Minerals. 17. 17-23 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Akaogi,M.: "Thermodynamics and stability relations of mantle minerals" Dynamic Processes of Material Transport and Transformation in the Earth's Interior(Terra Sci.Pulbl.Co.). (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Akaogi, M., Navrotsky, A., Yagi, T. and Akimoto, S.: "Pyroxene-garnet transformation: thermochemistry and elasticity of garnet solid solutions and applications to a pyrolite mantle." High-Pressure Research in Mineral Physics, Am. Geophys. Union, Geophys. Monogr. 39, 251-260, 1987.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Matsui, M., Akaogi, M. and Matsumoto, T.: "Computational model of the structural and elastic properties of the ilmenite and perovskite phases of MgSiO_3." Phys. Chem. Minerals, 14, 101-106, 1987.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Akaogi, M. and Navrotsky, A.: "Calorimetric study of high-pressure transitions among the CdGeO_3 polymorphs (pyroxenoid, garnet, ilmenite, and perovskite structures)." Phys. Chem. Minerals, 14, 435-440, 1987.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Yagi, T., Akaogi, M., Shimomura, O., Suzuki, T. and Akimoto, S.: "In situ observation of the olivine-spinel phase transformation in Fe_2SiO_4 using synchrotron radiation." J. Geophys. Res., 92, 6207-6213, 1987.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] McMillan, P. and Akaogi, M.: "Raman spectra of beta-Mg_2SiO_4(modified spinel) and gamma-Mg_2SiO_4." Am. Mineral., 72, 361-364, 1987.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Yagi, T., Akaogi, M., Shimomura, O., Tamai, H. and Akimoto, S.: "High-pressure and high-temperature equations of state of majorite." High-Pressure Research in Mineral Physics, Am. Geophys. Union, Geophys. Monogr. 39, 141-147, 1987.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] McMillan, P., Akaogi, M., Ohtani, E., Williams, Q., Nieman, R. and Sato, R.: "Cation disorder in garnets along the Mg_3Al_2Si_3O_<12>-Mg_4Si_4O_<12> join: an infrared, Raman and NMR study." Phys. Chem. Minerals, 16, 428-435, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Akaogi, M., Ito, E. and Navrotsky, A.: "The olivine-modified spinel-spinel transitions in the system Mg_2SiO_4-Fe_2SiO_4: calorimetric measurements, thermochemical calculation, and geophysical application." J. Geophys. Res., 94, 15671-15685, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Akaogi, M., Yusa, H., Ito, E., Yagi, T., Suito, K. and Iiyama, J. T.: "The ZnSiO_3 clinopyroxene-ilmenite transition: heat capacity, enthalpy of transition, and phase equilibria." Phys. Chem. Minerals, 17, 17-23, 1990.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Akaogi, M.: "Thermodynamics and stability relations of mantle minerals." Dynamic Processes of Material Transport and Transformation in the Earth's Interior, Terra Sci. Publ., 1990.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Matsumoto, T. and Wondratschek, H.: "The non-characteristic G-orbits of the plane groups G." Zeit. Krist., 179, 7-30, 1987.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Motoyama, T. and Matsumoto, T.: "The crystal structures and cation distributions of Mg and Fe of natural olivines." Mineral. J., 14, 338-350, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Akaogi,M.: "The olivine-modified spinel-spinel transitions in the system Mg_2SiO_4-Fe_2SiO_4:calorimetric measurements,thermochemical calculation and geophysical application." J.Geophys.Res.94. 15671-15685 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] McMillan,P.: "Cation disorder in garnets along the Mg_3Al_2Si_3O_<12>-Mg_4Si_4O_<12> join: an infrared,Raman and NMR study." Phys.Chem.Minerals. 16. 428-435 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Akaogi,M.: "The ZnSiO_3 clinopyroxene-ilmenite transition: heat capacity,enthalpy of transition and phase equilibria." Phys.Chem.Minerals. 17. 17-23 (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Akaogi,M.: "Thermodynamics and stability relations of mantle minerals" Dynamic Processes of Material Transport and Transformation in the Earth's Interior (Terra Scientific Publishing Co.). (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Motoyama,T.: "The crystal structures and cation distributions of Mg and Fe of natural olivines." Mineral.J.14. 338-350 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Akaogi,M.: Physics and Chemistry of Minerals. 14. 435-440 (1987)

    • Related Report
      1988 Annual Research Report
  • [Publications] Akaogi,M.: High-Pressure Research in Minerla physics (Americam Geophysical Union/Terra Sci.Publ.). 251-260 (1987)

    • Related Report
      1988 Annual Research Report
  • [Publications] Yagi,T.: High-Pressure Research in Mineral Physiscs(American Geophysical Union/Terr aSci.Publ.). 141-147 (1987)

    • Related Report
      1988 Annual Research Report
  • [Publications] Akaogi,M.: Dynamical Processes of Material Transport and Transformation in the Earth's Interior (Terra Sci.Prbl.). (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] McMillan,P.: Physics and Chemistry of Minerals. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] Akaoqi,M.: Journal of Geophysical Research. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] Akaogi, M.: Physics and Chemistry of Minerals. 14. 435-440 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] Akaogi, M.: High Pressure Research in Mineral Physics(American Geophysical Union). 251-260 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] Yagi, T.: High Pressure Research in Mineral Physics(American Geophysical Union). 141-147 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] McMillan, P.: American Mineralogist. 72. 361-364 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] Matsui, M: Physics and Chemistry of Minerals. 14. 101-106 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] 赤萩正樹: 鉱物学雑誌. 16. 31-41 (1987)

    • Related Report
      1987 Annual Research Report

URL: 

Published: 1987-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi