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Determination of post-spinel and post-majorite transitions by in situ X-ray observations with synchrotron radiation.

Research Project

Project/Area Number 10440128
Research Category

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

Allocation TypeSingle-year Grants
Section一般
Research Field 固体地球物理学
Research InstitutionEhime University

Principal Investigator

IRIFUNE Tetsuo  Ehime Univ., Faculty of Science Professor, 理学部, 教授 (80193704)

Co-Investigator(Kenkyū-buntansha) INOUE Toru  Ehime Univ., Faculty of Science Instructor, 理学部, 助手 (00291500)
Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥4,600,000 (Direct Cost: ¥4,600,000)
Fiscal Year 2000: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1999: ¥2,400,000 (Direct Cost: ¥2,400,000)
Keywordssynchrotron radiation / in situ X-ray observation / spinel / majorite / phase transition / high-pressure high-temperature / 660 km discontinuity / ポストスピネル / Spring-8 / 放射光実験 / パイロライト / マントル / ペロフスカイト / イルメナイト
Research Abstract

Phase transitions in Mg_2SiO_4, MgSiO_3, Ca_<0.5>Mg_<0.5>SiO_3 and pyrolite were studied by in situ X-ray diffraction using synchrotron radiation. It was found that the transitions to MgSiO_3 perovskite-related phases in all of these compositions were significantly (〜2 GPa) lower than those determined by quench experiments. It is suggested that the postspinel phase transition may not be responsible for the 660 km seismic discontinuity, or currently used pressure scales may be invalid at the P/T conditions of the lower mantle regime. A possible scenario to reconcile these experimental results with the observed seismic profile is proposed based on the calculations of the density and seismic velocity changes in subducting oceanic crust and pyrolitic mantle materials.
The dissociation of Ca_<0.5>Mg_<0.5>SiO_3 into an assemblage of MgSiO_3 and CaSiO_3 perovskites was firstly confirmed on the basis of in situ X-ray observation under simultaneous high pressure and high temperature conditions. The mutual solubilities of Mg- and Ca-components in these perovskite were found to be very limited at the pressures (21〜28 GPa) and temperatures (1000〜1800℃) studied. It is suggested that the diamond inclusions of lower mantle origin reported in Brazil may be formed at relatively low temperatures (<1200℃) related to the subduction of slabs.
Development of technology to produce higher pressures in multianvil apparatus using sintered diamond anvils was pursued in the final year of the present program. As a result, in situ X-ray observations are now possible at pressures to 40 GPa and temperatures to 1500℃. Preliminary experimental studies have been made on the phase transitions and P-V-T relations in MgAl_2O_4 and Ca_<0.5>Mg_<0.5>SiO_3 under these conditions.

Report

(4 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (27 results)

All Other

All Publications (27 results)

  • [Publications] T.Irifune,M.Miyashita,T.Inoue,K.Funakoshi,W.Utsumi: "High-pressure phase transformation in CaMgSi_2O_4 and implications for origin of ultra-deep diamond inclusions."Geophys.Res.Lett.. 27. 3541-3544 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Kuroda,T.Irifune,T.Inoue,N.Nishiyama,M.Miyashita,K.Funakoshi,W.Utsumi: "Determination of the phase boundary between ilmenite and perovskite in MgSiO_3 by in situ X-ray diffraction and quench experiments."Physics and Chemistry of Minerals. 27. 523-532 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Inoue,R.P.Papp,J.Zhang T.Gasparik,D.J.Weidner,T.Irifune: "Garnet fractionation in a hydrous magma ocean and the origin of Al-depleted komatiites."Earth and Planetary Science Letters. 177. 81-87 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Yusa,T.Inoue,Y.Ohishi: "Isothermal compressibility of hydrous ringwoodite and its relation to the mantle discontinuities."Geophys.Res.Lett.. 27. 413-416 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Kusloh and T.Inoue: "Mg-vacant structural modules and dilution of the symmetry of hydrous wadsleyite.B-Mg_2SiH_<2x>O_4 0.00<x<0.25"Phys.Chem.Minerals. 26. 382-388 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Irifune,N.Nishiyama,K.Kurada,T.Inoue,M.Isshiki,W.Utsumi,K.Funakoshi S,Urakawa,T.Uchida,T.Katsura, and O.ohtake: "The postspinel phase boundary in Mg_2SiO_4 determined by in situ X-ray diffraction."Science. 279. 1698-1700 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Inoue,T.Irifune,H.Yurimoto and I.Miyaqi: "Decomposition of K-amphibole at high pressures and implications for subduction zone volcanism Phys,Earth Planet,Inter.."Phys.Earth Planet.Inter.. 107. 221-231 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Irifune, M.Miyashita, T.Inoue, K.Funakoshi, and W.Utsumi: "High-pressure phase transformation in CaMgSi_2O_6 and implications for origin of ultradeep diamond inclusions."Geophy.Res.Lett.. 27. 3541-3544 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Inoue, T., R.P.Rapp, J.Zhang, T.Gasparik, D.J.Weidner and T.Irifune: "Garnet fractionation in a hydrous magma ocean and the origin of Al-depleted komatiites."Earth Planet.Sci.Lett.. 177. 81-87 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] H.Yusa, T.Inoue and Y.Ohishi: "Isothermal compressibility of hydrous ringwoodite and its relation to the mantle discontinuities."Geophys.Res.Lett.. 27. 413-416 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Kuroda, T.Irifune, T.Inoue, N.Nishiyama, M.Miyashita, K.Funakoshi, and W.Utsumi: "Determination of the phase boundary between ilmenite and perovskite in MgSiO_3 by in situ X-ray diffraction and quench experiments."Phys.Chem.Minerals. 27. 523-532 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Y.Kudoh and T.Inoue: "Mg-vacant structural modules and dilution of the symmetry of hydrous wadsleyite, β-Mg_<2x>SiH_<2x>O_4 with 0.00<x<0.25."Phys.Chem.Minerals. 26. 382-388 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Irifune, N.Nishiyama, K.Kuroda, T.Inoue, M.Isshiki, W.Utsumi, K.Funakoshi, S.Urakawa, T.Uchida, T.Katsura, and O.Ohtaka: "The postspinel phase boundary in Mg_2SiO_4 determined by in situ X-ray diffraction."Science. 279. 1698-1700 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Inoue, T.Irifune, H.Yurimoto and I.Miyagi: "Decomposition of K-amphibole at high pressures and implications for subduction zone volcanism"Phys.Earth Planet.Inter.. 107. 221-231 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Irifune,M.Miyashita,T.Inoue,K.Funakoshi,W.Utsumi: "High-pressure phase transformation in CaMgSi_2O_6 and implications for origin of ultra-deep diamond inclusions."Geophys.Res.Lett.. 27. 3541-3544 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Kuroda,T.Irifune,T.Inoue,N.Nishiyama,M.Miyashita,K.Funakoshi,W.Utsumi: "Determination of the phase boundary between ilmenite and perovskite in MgSiO_3 by in situ X-ray diffraction and quench experiments."Physics and Chemistry of Minerals. 27. 523-532 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Inoue,R.P.Papp,J.Zhang,T.Gasparik,D.J.Weidner,T.Irifune: "Garnet fractionation in a hydrous magma ocean and the origin of Al-depleted komatiites."Earth and Planetary Science Letters. 177. 81-87 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Yusa,T.Inoue,Y.Ohishi: "Isothermal compressibility of hydrous ringwoodite and its relation to the mantle discontinuities."Geophys.Res.Lett.. 27. 413-416 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 西山宣正、入舩徹男: "X線その場観察法によるマントル鉱物相転移境界の決定"高圧力の科学と技術. 9. 226-233 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Shinmei,N.Tomioka,K.Fujino,K.Kuroda,T.Irifune: "In situ X-ray diffraction study of enstatite up to 12 GPa and 1473K and eguations of state"Am.Mineral.. 84. 1588-1594 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] C.C.Lin,L.-G.Liu,T.Irifune: "High-Pressure Raman spectroscopy study of chondrodite."Phys.Chem.Minerals. 26. 226-233 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Inoue,R.P.Rapp.J.Zhang,T.Gasparik,D.J.Weidner,T.Irifune: "Garnet fractionation in a hydrous magma ocean and origin of Al-depleted komatiites"Earth Planet.Sci.Lett.. (印刷中). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] K.Kuroda,T.Irifune,T.Inoue,N.Nishiyama,M.Miyashita,K.Funakoshi,W.Otsumi: "Determination of the phase boundary between ilmenite and perovskite in MgSiO3 by in situ X-ray diffraction and guench experimen"

    • Related Report
      1999 Annual Research Report
  • [Publications] Irifune et al.: "Phase transformations in serpentine and transportation of water into the lower mantle." Geophysical Research Letters. 25,2. 203-206 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Irifune and Isshiki: "Iron partitioning in a pyrolite mantle and the nature of the 410-km seismic discontinuity." Nature. 392・6677. 702-705 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Irifune et al.: "The postspinel phase boundary in Mg_2SiO_4 determined by in situ x-ray diffraction" Science. 279. 1698-1700 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 西山宣正・入船徹男: "X線その場観察法によるマントル鉱物相転移境界の決定" 高圧力の科学と技術. 印刷中.

    • Related Report
      1998 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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