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1991 Fiscal Year Final Research Report Summary

Experimental Studies on Chemical Structure of the Deep Mantle and Its formation Processes.

Research Project

Project/Area Number 01420013
Research Category

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

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

Principal Investigator

ONUMA Kosuke  Prof. of Faculty of Science, Tohoku University, 理学部, 教授 (50000865)

Co-Investigator(Kenkyū-buntansha) HASENAKA Toshiaki  Instractor of Faculty of Science, Tohoku University, 理学部, 助手 (50202429)
FUJIMAKI Hirokazu  Associate Prof. of Faculty of Science, Tohoku Univ., 理学部, 助教授 (90133933)
AOKI Ken-ichiro  Prof. of Faculty of Science, Tohoku University, 理学部, 教授 (00004276)
KATO Takumi  Instractor of Faculty of Science, Tohoku University, 理学部, 助手 (90214379)
OHTANI Eiji  Associate Prof. of Faculty of Science, Tohoku University, 理学部, 助教授 (60136306)
Project Period (FY) 1989 – 1991
KeywordsMantle Minerals / Phase equilibria of silicate at high Pressure / Partioning of elements between mantle and core minerals / Phase transition at high pressure / Martian Interior / Density of Minerals / 珪酸塩メルトー鉱物の密度逆転
Research Abstract

Experimental studies on the earth matrials have been performed using the multi-anvil type high pressure apparatus with the following results during the term of project.
1. Phase relations among the mantle minerals above 8 GPa : Phase equilibrium diagrams have been determined for the system (1) forstbrite-anorthite-diopside, (2) diopside-enstatite, and (3) forsterite-pyrope. Pressure dependence of the composition of the liquid produced by partial melting and the melting behavior of the minerals present were elucidated.
2. Transitions and phase equilibria of the core materials : (1) Transitions of Fe were determined by the electric resistance method developed in our laboratory. (2) Phase equilibria of the system Fe-Fes were determined at 8 GPa.
3. Partitioning of elements between core and mantle materials : Partitioning of some elements between mantle minerals, silicate melts, and metal iron above 10 GPa was determined, and the relationships between abundance of these elements and core-mantle equilibrium odel were examined on the basis of the experimental data.
4. In-situ observation of MgSiO_3 transition by X-ray diffraction analysis : Transition of clinopyroxene structure - Mg_2SiO_4 spinel +stishovite - ilmenite structure were determined at 20 - 27 GPa.
5. Martian Interior model ; High pressure-high temperature experiments were carried out on a estimated martian mantle composition and a structure model of the martian interior were presented, based on the experimental results.
6. Density of peridotite melt at high pressures : Pressure dependence of forsterite and peridotite melt were examined with the result suggesting that density cross over between forsterite and Fe-rich peridotite melt is not probable.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Onuma,K.& S.Ichikawa: "Phase equlibria of the system diopside-acmite at low oxygen fugacity" Jour.Mineral.Petrol.Econ.Geol.86. 424-431 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Onuma,K.& H.Moridaira: "The system diopside-akermanite-pehlenite at l atm" Jour.Mineral.Petrol.Econ,Geol.86. 554-559 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ohtani,E.,T.kato & E.Ito: "Transition metal partitioning between lo wer mantle and core materiala 27 GPa" Geophys.Res.Lett.18. 85-88 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ohtani,E.,T.Kato,K.Onuma & E.Ito: "Partitioning of elements between mantle and core materials and early differentiation of the Earth" in High Press.Res.in Mineral Phys.,Application to Earth and Planetary Sci.(1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kato,T.: "Double stage mult-anvil system with a sintered diamond anvil for X-ray diffraction experiment at high pressures and temperatures" in High Prees.Res. in Mineral Phys.,Application to Earth and Planetary Sci.(1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] kamaya,N.,E.Ohtani,T.Kato & K.Onuma: "High pressure phase transitions in a homogeneous model Martian mantle" Geophys. Monograph Ser.,Am.Geophys.Union Books. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Onuma, K. and S. Ichikawa: "Phase equilibria of the system diopside-acmite at low oxygen fugacity" J. Mineral. Petrol. Econ. geol. 86. 424-431 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Onuma, K. and H. Moridaira: "The system diopside-akermanite-gehlenite at 1 atm." J. Mineral. Petrol. Econ. Geol. 86. 554-559 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ohtani, E., T. Kato and E. Ito: "Transition metal partioning between lowere mantle and core material at 27 GPa" Geohpys. Res. Lett.18. 85-88 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ohtani, E., T. Kato, K. Onuma and E. Ito: "Partitioning of elements between mantle and core materials and early differentiation of the Earth" High Press. Res. in Mineral Phys., Application to Earth and Planet. Sci.(1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kato, T.: "Double stage multi-anvil system with a sintered diamond anvil for X-ray diffraction experiment, at high pressures and temperatures" High Press. Res. in Mineral Phys., Application to Earth and Planet. Sci.(1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kamaya, N., E. Ohtani, T. Kato and K. Onuma: "High pressure phase transitions in a homogeneous model Martin mantle" Geophys. Monograph Ser.Am. Geophys. Union Books. (1992)

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

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Published: 1993-03-16  

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