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1994 Fiscal Year Final Research Report Summary

Element partitioning at ultrahigh pressure and chemical evolution of the Earth's interi

Research Project

Project/Area Number 04452081
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 InstitutionTohoku University

Principal Investigator

OHTANI Eiji  Tohoku University, Professor, 理学部, 教授 (60136306)

Co-Investigator(Kenkyū-buntansha) ONUMA Kosuke  Tohoku University, Professor, 理学部, 教授 (50000865)
KATO Takumi  Tohoku University, Assistant professor, 理学部, 助手 (90214379)
Project Period (FY) 1992 – 1994
KeywordsPerovskite / Metallic iron / Partitioning / Partition coefficient / Sulfur / Melting / Phase transition
Research Abstract

In this work, we determined the partition coefficients of lithophile and siderophile elements between Mg-perovskite and magma, Mg-perovskite and molten iron, magma and molten iron, and magnesiowustite and molten iron. The experiments of the partitioning between molten iron and magma indicate that the partition coefficients between magma and molten iron implies that those for Fe, Co, and Ni decrease with increasing pressure, whereas that of Mn increase with increasing pressure, and these partition coefficients increases with increasing temperature. We also studied the effect of sulfur and carbon for the partitioning between magma and molten iron. We found that the partition coefficients of Mo and W,especially W,change with existence of a small amount of sulfur in the system ; W (and Mo) n the sulfur containing system tends to enter into the silicate magma compared to those in sulfur free system. The present partitioning behavior of Mo and W implies that the present mantle abundance of W and Mo is consistent with the core-mantle equilibrium without sulfur in the system. This suggests that sulfur is not likely to be a candidate for the light element in the core.
We also conducted the melting and phase transition experiments of the mantle minerals, such as the Mg_2SiO_4-Fe_2SiO_4, Mg_2SiO_4-Mg_3Al_2Si_3O_<12>, and Mg_2SiO_4-H_2O systems. These data provide basic information on the deep seated magmatism and the amount of water in the transition zone and the upper most part of the lower mantle.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Ohtani,E.and Kamaya.N: "The Geuchemical Model of Mars" Geophys.Res Lett.19. 2239-2242 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ohtani,E.et al.: "Flutation of olivine in the poridotiti melt at high pressure" Proceedings of Japan Academy. 96. B23-28 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Morishima,H.et al.: "The raman spectroscopic study for Mgsio_3 perovskite and majnite solid solutims Mgsio_3-Mg_3Al_2Si_3O_<12>" Mineralogical Jour.16. 399-406 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Morishima,H.et al.: "Thermal expansion of Mgsio_3 perovskite at.20.5GPa" Geophys.Res Lett.,. 21. 899-902 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Morishima,H.et al.: "The phase boundary between α- and β-Mg_2sio_4 determined by in-situ X-ray obseruxtion" Science. 265. 1202-1203 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ohtani.E,et al: "Moltiry relation of peridotite and the deusity orossover in planetary mantles" Chemieal Geology. 120(in precc). (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ohtani, E.and Kamayo, N.: "The geochemical model of Mars" Geophys.Res.Lett.19. 2239-2242 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ohtani, E., Suzuki, A., and Kata, T.: "Flotation of olivine in the peridotite melt at high pressure" Proceedings of Japan Academy. 96(ser.B). 23-28 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Morishima, H., Ohtani, E..and Arashi, H.: "The raman spectroscopic study for MgSiO3 perovskite and majorite solid solutions MgSiO3-Mg3Al2Si3O12" Mineral Jour. 16. 399-406 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Morishima, H., Ohtani, E., Kato, T., Shimomura.O., and Kikegawa, T.: "Thermal expansion of MgSiO3 perovskite at 20.5 Gpa." Geophys.Res.Lett.21. 899-902 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Morishima, H., Kato, T., Urakawa, S., Utusmi W., M.Suto, E.Ohtnai, O.Shimomura, and T.Kikegawa.: "The phase boundary between alpha-and beta-Mg2SiO4 determined by in-situ X-ray observation." Science. 265. 1202-1203 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ohtani, E., Nagata, Y., Suzuki, A., and Kato, T.: "Melting relations of peridotite and the density crossover in planetary mantles." Chemical Geology. 120 (in press). (1995)

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

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Published: 1996-04-15  

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