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2000 Fiscal Year Final Research Report Summary

Phase equilibrium and element partitioning in the lower mantle

Research Project

Project/Area Number 09304051
Research Category

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

Allocation TypeSingle-year Grants
Section一般
Research Field Petrology/Mineralogy/Science of ore deposit
Research InstitutionTohoku University

Principal Investigator

OKTANI Eiji  Tohoku University, Inst, Min, Petrol. Econ. Geol., Professor, 大学院・理学研究科, 教授 (60136306)

Co-Investigator(Kenkyū-buntansha) SUZUKI Akio  Tohoku University, Inst. Min. Petrol. Econ. Geology, Res.Assoc, 大学院・理学研究科, 助手 (20281975)
Project Period (FY) 1997 – 2000
Keywordsphase transition / transition zone / lower mantle / kinetics / magma / hydrous phase / care formation / high pressure
Research Abstract

In this research, we clarified the phase transitions and partitioning of elements in mantle minerals in the transition zone and the lower mantle, i.e., stability of hydrous phases, melting and physical properties of magma, phase transition kinetics, core formation process in the early Earth. One of the important results in this study is on the stability of hydrous phases. We observed two new hydrous minerals which are expected to exist in the lower mantle ; i.e., phase G (Mg1.14Si1.73H2.81O6) and phase d-AlOOH.Phase G is stable at relatively low temperature around 1000-1200℃ at around 25 GPa and it is expected to exist in the peridotite layer in the cold slab descending into the lower mantle. Whereas phase delta AlOOH is stable in the sediment components in the descending slabs in the upper most part of the lower mantle. These phases work as the water carrier into the lower mantle. Another mportant results in this research is on decomposition kinetics of ringwoodite. We observed periclase and ilmenite, and priclase and stishovite as a metastable assemblage in the beginning of the decomposition of ringwoodite. These metastable assemblages eventually disappeared within 10 minutes to form stable assemblage, i.e., periclase and perovskite.

  • Research Products

    (73 results)

All Other

All Publications (73 results)

  • [Publications] S. Mori, E. Ohtani, A. Suzuki: "Viscosity of the albite melt to 7GPa at 2000k"Earth of Planetarg Science Letter. 175. 87-92 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E. Ohtani H. Mizobata, H. Yrimeoto: "Stability of dense hydrous magnesium silicate Phases in the systems Mg_2SiO_4-H_2O and MgSiO_3-H_2O at pressures upto 27GPa"Phys. Chem. Minerals. 27. 533-544 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Kubo, E. Ohtani et al.: "Formation of metastable assemblages and mochanisms of the grain-size reduction in the postspinel transformation in Mg_2SiO_4"Geophysical Research Letters. 27. 807-810 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Kudoh et al.: "Structure and cation disorder of hydrous ringwoodite αMg 1.89 Sio98 H0.30O4"Physics of Chemistry of Minerals. 27. 474-479 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A. Suzuki, E. Ohtani et al.: "In situ determination of the phase boundary between wadsleyite and ringwoodite in Mg_2SiO_4"Geophysical Research Letters. 27. 803-806 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A. Suzuki, E Ohtani et al: "A new hydrous phase δ-ALOOH synthesiged at 21GPa and 1000℃"Physice of Chemistry of Minerals. 27. 689-693 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ohtani,E.,H.Yurimoto,S.Seto: "The element partitioning between metallic liquid, silicate liquid, and lower mantle minerals : Implications for the core formation of the Earth.Phys.Earth Planet.Inter.,"Phys.Earth Planet.Inter.,. 100. 97-114 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E.Ohtani,H.Mizobata,Y.Kudoh,T.Nagase,H.Arashi,H.Yurimoto,and I.Miyagi: "A new hydrous silicate, a water reservoir, in the ipper part of the lower mantle."Geophys.Res,Lett.,. 24. 1047-1050 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Kudoh,T.Nagase,H.Mizobata,and E.Ohtani: "Structure and cystal chemiatry of phase G, a new hydrous magnesium silicate synthesized at 22 GPa and 1050℃,Geophys."Res.Lett.,. 24. 1051-1054 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Courtial,P.,E.Ohtani,D.B.Dingwell: "High-temperature densities of some mantle melts."Geochim.Cosmochim.Acta.. 61. 3111-3119 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kudoh,Y.,T.Nagase,H.Mizobata,E.Ohtani,S.Sasaki,M.Tanaka: "Possible sites for hydrogen in a new hydrous magnesium silicate phase G synthesized at 22 GPa and 1050℃"Proceedings for AIRAPT16, Kyoto August. 24-29 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大谷栄治: "地球惑星内部にける水の役割"高圧力の科学と技術. 6巻. 30-35 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大谷栄治: "超高圧下での元素分配からみた初期地球の分化"火山. 42巻、特別号. S267-S274 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大谷栄治、久保友明、鈴木昭夫: "プルーム内部で何がおこっているのか:超高圧実験からみたプルームテクトニクス"科学. 67巻. 534-542 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Hamahata,E.Ohtani,and K.Kawamura: "Molecular dyamic estimation of the temperature anormaly in the lower mantle.Extended abstract of international symposium on New Images of the Earth's interior through long-term ocean-floor observations"Ocean Hemisphere Project. 113-115 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] D.Yamazaki,T.Kato,H.Yurimoto,E.Ohtani,M.Toriumi: "Silicon self-diffusion in perovskite at high pressure.Extended abstract of international symposium on New Images of the Earth's interior through long-term ocean-floor observations."Ocean Hemisphere Project. 116 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Kudoh,T,Nagase,H.Mizobata,E.Ohtani,S.Sasaki,M.Tanaka.: "Crystal structure of phase G synthesized at 22 GPa and 1050C."KEK Progress report. 97-2. (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ohtani,E.,A.Suzuki and T.Kato,: "Flotation of olivine and diamond in mantle melt at high pressure : Implications for fractionation in the deep mantle and ultradeep origin of diamond, in Properties of Earth and Planetary Materials at High Pressure and Temperature"Geophys.Monogr.Ser.,vol.101,edited by M.H.Manghnani and T.Yagi,AGU,Washington,D.C.,. 227-239 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kubo,T.,E.Ohtani,T.Kato,H.Morishima,D.Yamazaki,A.Suzuki,K.Mibe,T.Kikegawa and O.Shimomura: "An in situ X ray diffraction study of the α-β transformation kinetics of Mg2SiO4"Geophys.Res.Lett.,. 25. 695-698 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Asahara,Y.,E.Ohtani and A.Suzuki: "Melting relations of hydrous and dry mantle compositions and the genesis of komatiites"Geophys.Res.Lett.,. 25. 2201-2204 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kubo,T.,E.Ohtani,T.Kato,T.Shinmei and K.Fujino: "Effects of water on the α-β transformation kinetics in San Carlos olivine"Science. 281. 85-87 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kubo,T.E.Ohtani.T.Kato,T.Shinmei,K.Fujino: "Experimental investigation of the α-β transforamtion of San Carlos olivine single crystal."Phys.Chem.Minerals. 26. 1-6 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E.Ohtani,Y.Kudoh,H.Naito,H.Arashi: "Stability of dense hydrous magnesium silicate phase G in the transition zone and the lower mantle."Mineral.J.,. 20. 163-169 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Kudoh,T.Nagase,H.Mizobata,E.Ohtani,S.Sasaki,M.Tanaka: "Possible sites of hydrogen in a new hydrous magnesium silicate phase G synthesized at 22 GPa and 1050C."Rev.High Pressure Sci.Technol.,. 7. 134-136 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Kato,N.Makata,E.Ohtani,K.Onuma: "Melting experiments on the forsteritepyrope system at 8 GPa and 13.5 GPa"Phys.Earth Planet.Interiors. 107. 97-102 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E.Ohtani,K.Moriwaki,T.Kato,K.Onuma: "Melting and crystal-liquid partitioning in the system Mg2SiO4-Fe2SiO4 to 25 GPa"Phys.Earth Planet.Interiors. 197. 75-82 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Suzuki,E.Ohtani,T.Kato: "Density and thermal expansion of a peridotite melt at high pressure."Phys.Earth Planet.Inter.,. 107. 53-61 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E.Ohtani,H.Mizobata,Y.Kudoh,T.Nagase,H.Arashi,H.Yurimoto,I.Miyagi: "Reply,Geophys."Resarch Lett.,. 25. 981-982 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] C.K.Gessmann,E.Ohtani,and D.C.Rubie: "Element partitioning between magnesiowustite and silicate melt as a function of melt composition and temperture at high pressure."Rev.High Pressure Sci.Technol.,. 7. 66-68 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大谷栄治: "地球核形成過程における平衡と非平衡"鉱物学雑誌. 27巻. 179-184 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Morishima,E.Ohtani,T.Kato,T.Kubo,A.Suzuki,T.Kikegawa,and O.Shimomura: "High pressure and temperature equation of state of a majorite solid solution in the system Mg4Si4O12-Mg3Al2Si3O12."Phys.Chem.Mineral.,. 27. 3-10 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大谷栄治、朝原友紀: "初期地球における水の役割:始生代の含水マントルの融解によるコマチアイトマグマ及びクラトニックペリドタイトの生成"地球化学. 33. 235-245 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E.Ohtani and T.J.Ahrens: "Physical and Chemical evolution of the Earth.Editors."Phys.Rarth Planet.Inter.(Editors),IUGG Special volume. volume 100. 213 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E. Ohtani & T.J.Ahrens: "Phys. Earth & Planetary Interior, IUGG special volume"Elsevier publicetions(エルゼビア). 213 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 阿部豊,大谷栄治: "地球ダイナミックスの辞典、8.3章地球の下構造の成立"朝倉書店(印刷中). (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 阿部豊、大谷栄治: "地球ダイナミックスの辞典、8.3 地球の層構造の成立"朝倉書店(印刷中). (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Abe,E.Ohtani,T.Okuchi,K.Righter,M.Drake: "Water in the Earth, In Origin of the Earth and Moon, edited by R.M.Canup and K.Righter"The University of Arizona Press. 413-434 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Mori, E.Ohtani, A.Suzuki: "Viscosity of the albite melt to 7 GPa at 2000K."Earth Planet.Sci.Lett.. 175. 87-92 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E.Ohtani, H.Mizobata, and H.Yurimoto: "Stability of dense hydrous magnesium silicate phases in the systems Mg2SiO4-H2O and MgSiO3-H2O at pressures up to 27 GPa."Phys.Chem.Minerals. 27. 533-544 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Kubo, E.Ohtani et al.: "Formation of metastable assemblages and mechanisms of the grain-size reduction in the postspinel transformation in Mg2SiO4."Gophys.Research Lett.. 27. 807-810 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Kudoh, T.Kuribayashi, H.Mizobata, E.Ohtani: "Structure and cation disorder of hydrous ringwoodite, γ-Mg1.89Si0.98H0.30O4."Phys.Chem.Minerals. 27. 474-479 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Suzuki, E.Ohtani, H.Morishima, T.Kubo, Y.Kanbe, T.Kondo, T.Okada, H.Terasaki, T.Kubo, T.Kikegawa: "In situ determination of the phase boundary between wadsleyite and ringwoodite in Mg2SiO4."Geophys.Res.Lett.. 27. 803-806 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Suzuki, E.Ohtani, T.Kamada: "A new hydrous phase δ-AlOOH synthesized at 21 GPa and 1000℃."Phys.Chem.Mineral. 27. 689-693 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] D.Yamazaki, T,Kato, H.Yurimoto, E.Ohtani, M.Toriumi: "Silicon self-diffusion in MgSiO3 perovskite at 25 GPa."Phys.Earthh and Planetary Inter.. 119. 299-309 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ohtani, E., H.Yurimoto, S.Seto: "The element partitioning between metallic liquid, silicate liquid, and lower mantle minerals : Implications for the core formation of the Earth."Phys.Earth Planet.Inter.. 100. 97-114 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E.Ohtani, H.Mizobata, Y.Kudoh, T.Nagase, H.Arashi, H.Yurimoto, and I.Miyagi: "A new hydrous silicate, a water reservoir, in the ipper part of the lower mantle"Geophys.Res, Lett.. 24. 1047-1050 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Kudoh, T.Nagase, H.Mizobata, and E.Ohtani: "Structure and cystal chemiatry of phase G, a new hydrous magnesium silicate synthesized at 22 GPa and 1050℃"Geophys.Res.Lett.. 24. 1051-1054 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Courtial, P., E.Ohtani, D.B.Dingwell: "High-temperature densities of some mantle melts."Geochim.Cosmochim.Acta. 61. 3111-3119 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kudoh, Y., T.Nagase, H.Mizobata, E.Ohtani, S.Sasaki, M.Tanaka: "Possible sites for hydrogen in a new hydrous magnesium silicate phase G synthesized at 22 GPa and 1050℃"Proceedings for AIRAPT16, Kyoto August 24-29. (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Eiji Ohtani: "Role of water in the earth and planetary interior"Rev.High Pressure Sci.Tech.. 6(in Japanese). 30-35 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Eiji Ohtani: "Fractionation of the early Earth : a view from experiments on element partitioning at ultrahigh pressure."Kazan. 42, special volume S267-274(in Japanese). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Eiji Ohtani, Tomoaki Kubom Akio Suzuki: "Nature of the mantle plume : a model of plume tectonics from the high pressure experiments"Kagaku. 67(in Japanese). 534-542 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Hamahata, E.Ohtani, and K.Kawamura: "Molecular dyamic estimation of the temperature anormaly in the lower mantle. Extended abstract of international symposium on New Images of the Earth's interior through long-term ocean-floor observation"Ocean Hemisphere Project. 113-115 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] D.Yamazaki, T.Kato, H.Yurimoto, E.Ohtani, M.Toriumi: "Silicon self-diffusion in perovskite at high pressure. Extended abstract of international symposium on New Images of the Earth's interior through long-term ocean-floor observations"Ocean Hemisphere Project. 116 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Kudoh, T,Nagase, H.Mizobata, E.Ohtani, S.Sasaki, M.Tanaka: "Crystal structure of phase G synthesized at 22 GPa and 1050C."KEK Progress report. 97-2. (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ohtani, E., A.Suzuki and T.Kato: "Flotation of olivine and diamond in mantle melt at high pressure : Implications for fractionation in the deep mantle and ultradeep origin of diamond, in Properties of Earth and Planetary Materials at High Pressure and Temperature"Geophys.Monogr.Ser., edited by M.H.Manghnani and T.Yagi, AGU, Washington, D.C.. vol.101. 227-239 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kubo, T., E.Ohtani, T.Kato, H.Morishima, D.Yamazaki, A.Suzuki, K.Mibe, T.Kikegawa and O.Shimomura: "An in situ X ray diffraction study of the α-β transformation kinetics of Mg2SiO4"Geophys. Res. Lett.. 25. 695-698 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Asahara, Y., E.Ohtani and A.Suzuki: "Melting relations of hydrous and dry mantle compositions and the genesis of komatiites"Geophys.Res.Lett.. 25. 2201-2204 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kubo, T., E.Ohtani, T.Kato, T.Shinmei and K.Fujino: "Effects of water on the α-β transformation kinetics in San Carlos olivine"Science. 281. 85-87 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kubo, T.E.Ohtani. T.Kato, T.Shinmei, K.Fujino: "Experimental investigation of the α-β transformation of San Carlos olivine single crystal"Phys.Chem.Minerals. 26. 1-6 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E.Ohtani, Y.Kudoh, H.Naito, H.Arashi: "Stability of dense hydrous magnesium silicate phase G in the transition zone and the lower mantle."Mineral.J.. 20. 163-169 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Kudoh, T.Nagase, H.Mizobata, E.Ohtani, S.Sasaki, M.Tanaka: "Possible sites of hydrogen in a new hydrous magnesium silicate phase G synthesized at 22 GPa and 1050C."Rev.High Pressure Sci.Technol.. 7. 134-136 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Kato, N.Makata, E.Ohtani, K.Onuma: "Melting experiments on the forsteritepyrope system at 8 GPa and 13.5GPa"Phys.Earth Planet.Interiors. 107. 97-102 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E.Ohtani, K.Moriwaki, T.Kato, K.Onuma: "Melting and crystal-liquid partitioning in the system Mg2SiO4-Fe2SiO4 to 25 GPa"Phys.Earth Planet.Interiors. 197. 75-82 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Suzuki, E.Ohtani, T.Kato: "Density and thermal expansion of a peridotite melt at high pressure."Phys.Earth Planet.Inter.. 107. 53-61 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E.Ohtani, H.Mizobata, Y.Kudoh, T.Nagase, H.Arashi, H.Yurimoto, I.Miyagi: "Reply"Geophys.Resarch Lett.. 25. 981-982 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] C.K.Gessmann, E.Ohtani, and D.C.Rubie: "Element partitioning between magnesiowustite and silicate melt as a function of melt composition and temperture at high pressure"Rev.High Pressure Sci.Technol.. 7. 66-68 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Eiji Ohtani: "Core formation process ; equilibrium or disequilibrium?"Kobutugalu Zasshi. 27(in Japanese). 179-184 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Morishima, E.Ohtani, T.Kato, T.Kubo, A.Suzuki, T.Kikegawa, and O.Shimomura: "High pressure and temperature equation of state of a majorite solid solution in the system Mg4Si4O12-Mg3Al2Si3O12."Phys.Chem.Mineral.. 27. 3-10 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Eiji Ohtani, Yuki Asahara: "Role of water in the early Earth : Generation of komatiite magmas and origin of the cratonic pewridotite by partial melting of the Archean cratonic mantle"Chikyu Kagaku. 33(in Japanese). 235-245 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E.Ohtani and T.J.Ahrens: "Physical and Chemical evolution of the Earth."Phys.Rarth Planet.Inter.(Editors), IUGG Special volume. volume 100. 213 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yutaka Abe and Eiji Ohtani: "Forimation of layered strucuture of the Earth, in Dictionary for dynamics of the Earth"Asakura Shoten (in press)(in Japanese). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Abe, E.Ohtani, T.Okuchi, K.Righter, M.Drake: "Water in the Earth, In Origin of the Earth and Moon, edited by R.M.Canup and K.Righter"The University of Arizona Press. 413-434 (2000)

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

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Published: 2002-03-26  

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