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1993 Fiscal Year Final Research Report Summary

TEHORETICAL STUDY OF THE DIFFERENTIATION PROCESSES OF PROTOMANTLE AND EARLY EVOLUTION OF TERRESTRIAL PLANETS

Research Project

Project/Area Number 04835007
Research Category

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

Allocation TypeSingle-year Grants
Research Field 惑星科学
Research InstitutionThe University of Tokyo

Principal Investigator

ABE Yutaka  The University of Tokyo, Graduate School of Science, Associate Professor, 大学院・理学系研究科, 助教授 (90192468)

Project Period (FY) 1992 – 1993
KeywordsMagma Ocean / Mantle Differentiation / Convective Mixing / Gravitational Differentiation
Research Abstract

Achievement of this study is establishment of (1)a scenario for the early evolution based on cooling of a magma ocean, (2)criteria for the differentiation of the lower mantle. (1)A scenario for the early evolution : (a)Viscosity of partial melt changes drastically at the 'critical melt fraction'. Hence, magma oceans are divided into 2 categories, namely, the 'soft magma ocean' in which the melt fraction is higher than the critical melt fraction, and the 'hard magma ocean in which the melt fraction is lower than the critical melt fraction. (B)In a soft magma ocean, vigorous convection disturbs chemical differentiation. Without extensive heat source and/or atmospheric blanketing, this magma ocean cools into the hard magma ocean within 1 My. (c)In a hard magma ocean, less vigorous convection allows chemical differentiation. Owing to slow cooling, this stage continues more than 100-200My. Hence, the Earth's interior is in a hard magma ocean state just after the end of accretion. (d)At this stage, the surface of the Earth is covered by a water ocean and a very thin chilled crust. However, this crust is repeatedly destroyed by magmatic activity from the subsurface magma ocean and impacts of planetesimals. (2)Differentiation of the lower mantle : (a)Formation of a deep magma ocean does not necessary imply chemical differentiation at the lower mantle condition. (b)Specifically, without atmospheric blanketing, very rapid cooling suppresses chemical differentiation. (c)However, when the surface temperature is kept above 2200K by an atmospheric blanketing, chemical differentiation proceeds. Thus, differentiation of the lower mantle critically depends on the condition during accretion.

  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] Abe,Y.: "Thermal evolution and chemical differentiation of the terrestrial magma ocean," "Evolution of the Earth and Planets" Geophysical Monogfraph 74,IUGG Volume. 14. 41-54 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Abe,Y.: "Physical state of very early Earth," Lithos,. 30. 223-235 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Abe,Y.: "Early evolution of the terrestrial planets." J.Phys.Earth,. 43,. 515-532 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Abe,Y.: "Basic equations for evolution of partially molten mantle and core," "The Earth's Central Part : Its Structure and Dynamics". 215-230 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 阿部豊: "マグマオーシャン分化と惑星形成." 遊星人,. 5. 119-125 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Abe,Y.: "Thermal and chemical evolution of the terrestrial magma ocean." Phys.Earth Planet.Int.,. 100,. 27-39 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Abe, Y.: "Thermal evolution and chemical differentiation of the terrestrial magma ocean" "Evolution of the Earth and Planets" (edited by E.Takahashi, R.Jeanloz, and D.Rubie) Geophysical Monogfraph 74, IUGG Volume 14,41-54, IUGG/ACU. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Abe, Y.: "Physical state of very early Earth" Lithos. 30. 223-235 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Abe, Y.: "Protocrust of the Earth just after the end of accretion." Proc.25th ISAS Lunar Planet Symp., Institute of Space and Astronautical Science, Sagamihara. 172-177 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Abe, Y.: "Early evolution of the terrestrial planets." J.Phys.Earth. 43. 515-532 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Abe, Y.: "Basic equations for evolution of partially molten mantle and core" "The Earth's Central Part : Its Structure and Dynamics" (edited by T.Yukutake). 215-230 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Abe, Y.: "Differentiation of deep magma ocean." Proc.28th ISAS Lunar Planet Symp., pp.114-117, Institute of Space and Aeronautical Science, Sagamihara. (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Toda, Y.and Y.Abe: "Mantle differentiation by the impact of planetesimals." Proc.28th ISAS Lunar Planet Symp., pp.110-113, Institute of Space and Aeronautical Science, Sagamihara. (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Abe, Y.: "Differentitaion of the magma ocean and planetary formation (in Japanese)" Yuseijin. 5(3). 119-125 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Abe, Y: "Thermal and chemical evolution of the terrestrial magma ocean." Phys.Earth Planet.Int.100. 27-39 (1997)

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

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Published: 1999-03-16  

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