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Melting Relations in the System, CaO-MgO-Al_2O_3-SiO_2, at Ultra-high Pressure

Research Project

Project/Area Number 02452069
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 InstitutionEarthquake Research Institute, University of Tokyo

Principal Investigator

FUJII Toshitsugu  Univ. Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (00092320)

Co-Investigator(Kenkyū-buntansha) KURITA Kei  Tsukuba Univ., Department of Earth Sciences, Associate Professor, 地球科学系, 助教授 (00111451)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1991: ¥2,100,000 (Direct Cost: ¥2,100,000)
Keywordsultra-high pressure experiments / CaO-MgO-Al_2O_3-SiO_2 System / komatiite / generation of magmas / マントル物質
Research Abstract

Melting relations of the mantle materials in the system, CaO-MgO-Al_2O_3-SiO_2, have been investigated with high pressure apparatus of MA-8 type. The compositions of melt coexisting with olivine, pyroxenes and garnet were estimated in the pressure range from 3 to 8 GPa based on the above experiments. CaO/Al_2O_3 ratio of the melt coexisting with the above four phases is almost unity up to 4 GPa and increases with increasing of pressure. This result indicates that komatiite magmas with CaO/Al_2O_3 ratio larger than unity can be formed by partial melting of peridotite or chondritic materials which are supposed to be primary materials for Earth and have CaO/Al_2O_3 ratio of unity.
In order to apply the above results to the natural system, it is necessary to know the effect of other components on the partitioning of elements between melt and major mineral phases. From this view point, melting experiments on natural basalt system were also performed. The partitioning of major elements between garnet and melt does not change even the composition of garnet changes with increasing pressure. The partitioning of minor elements such as Na, however, changes drastically with increasing pressure. This may indicate that melting experiments should be done in the Nabering system addition to the above simple system.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] Fujii,T.,Yasuda,A.and Kurita,K.: "Compositions of incipient melt in the system,CaO-MgO-Al_2O_3-SiO_2,at ultra-high pressure" E.P.S.L.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yasuda,A.,Fujii,T.and Kurita,K.: "A fate of subducted oceanic crust:(I)Implications for the genesis of continental flood basalts." P.E.P.I.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Fujii, T., Yasuda, A. and Kurita, K.: "Compositions of incipient melt in the system, CaO-MgO-Al2O3-SiO2, at ultra-high pressure." Earth Planet. Sci, Lett.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yasuda, A., Fujii, T. and Kurita, K.: "A fate of subducted oceanic crust : (I) Implications for the genesis of continental flood basalts." Phys. Earth Planet. Int.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Fujii,T.,Yasuda,A.and Kurita,K.: "Compositions of incipient melt in the system,CaOーMgOーAl_2O_3ーSiO_2,at ultraーhigh pressure" E.P.S.L.

    • Related Report
      1991 Annual Research Report
  • [Publications] Yasuda,A.,Fujii,T.and Kurita,K.: "A fate of subducted oceanic crust:(I)Implications for the genesis of continental flood basalts." P.E.P.I.

    • Related Report
      1991 Annual Research Report
  • [Publications] Yasuda,A.,Fujii,T.and K.Kurita: "A New technique for in situ oxygen fugacity measurement at higt pressure" American Mineralogist.

    • Related Report
      1990 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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