Physics and Chemistry of Minerals

, Volume 33, Issue 2, pp 106–114 | Cite as

The phase boundary between wadsleyite and ringwoodite in Mg2SiO4 determined by in situ X-ray diffraction

  • T. Inoue
  • T. Irifune
  • Y. Higo
  • T. Sanehira
  • Y. Sueda
  • A. Yamada
  • T. Shinmei
  • D. Yamazaki
  • J. Ando
  • K. Funakoshi
  • W. Utsumi
Original Paper

Abstract

The phase boundary between wadsleyite and ringwoodite in Mg2SiO4 has been determined in situ using a multi-anvil apparatus and synchrotron X-rays radiation at SPring-8. In spite of the similar X-ray diffraction profiles of these high-pressure phases with closely related structures, we were able to identify the occurrence of the mutual phase transformations based on the change in the difference profile by utilizing a newly introduced press-oscillation system. The boundary was located at ~18.9 GPa and 1,400°C when we used Shim’s gold pressure scale (Shim et al. in Earth Planet Sci Lett 203:729–739, 2002), which was slightly (~0.8 GPa) lower than the pressure as determined from the quench experiments of Katsura and Ito (J Geophys Res 94:15663–15670, 1989). Although it was difficult to constrain the Clapeyron slope based solely on the present data due to the kinetic problem, the phase boundary [P (GPa)=13.1+4.11×10−3×T (K)] calculated by a combination of a PT position well constrained by the present experiment and the calorimetric data of Akaogi et al. (J Geophys Res 94:15671–15685, 1989) reasonably explains all the present data within the experimental error. When we used Anderson’s gold pressure scale (Anderson et al. in J Appl Phys 65:1535–1543, 1989), our phase boundary was located in ~18.1 GPa and 1,400°C, and the extrapolation boundary was consistent with that of Kuroda et al. (Phys Chem Miner 27:523–532, 2000), which was determined at high temperature (1,800–2,000°C) using a calibration based on the same pressure scale. Our new phase boundary is marginally consistent with that of Suzuki et al. (Geophys Res Lett 27:803–806, 2000) based on in situ X-ray experiments at lower temperatures (<1,000°C) using Brown’s and Decker’s NaCl pressure scales.

Keywords

Wadsleyite Ringwoodite Phase transformation High pressure In situ X-ray diffraction 

Notes

Acknowledgements

We thank K. Kuroda, N. Nishiyama, T. Ueda, Y. Tanimoto, M. Miyashita, S. Matsushita, K. Kawamura, T. Futagami, Y. Okajima for their assistance during the present in situ X-ray diffraction experiments. We also thank R.P. Rapp for valuable comments in this manuscript. Constructive comments by T. Yagi and an anonymous reviewer were greatly helpful to improve the manuscript. This work was supported in part by Grants-in-Aid for Scientific Research from Ministry of Education, Science, Sport, and Culture, Japan to T. Inoue. This work was also partly supported by the Earthquake Research Institute cooperative research program of University of Tokyo to T. Inoue. In situ X-ray diffraction experiments were carried out using the SPEED-1500 at SPring-8 (proposal No. 1998A0144-ND-np, 1999A0101-CD-np, 1999B0412-ND-np, 2000A0009-CD-np)

References

  1. Akaogi M, Ito E, Navrotsky A (1989) Olivine-modified spinel–spinel transitions in the system Mg2SiO4–Fe2SiO4: calorimetric measurements, thermochemical calculation, and geophysical application. J Geophys Res 94:15671–15685CrossRefGoogle Scholar
  2. Akimoto S, Fujisawa H (1968) Olivine-spinel solid solution equilibria in the system Mg2SiO4–Fe2SiO4. J Geophys Res 73:1467–1479CrossRefGoogle Scholar
  3. Anderson OL, Isaak DG, Yamamoto S (1989) Anharmonicity and the equation of state for gold. J Appl Phys 65:1535–1543Google Scholar
  4. Brown JM (1999) The NaCl pressure standard. J Appl Phys 86:5801–5808CrossRefGoogle Scholar
  5. Decker DL (1971) High-pressure equation of state for NaCl, KCl, and CsCl. J Appl Phys 42:3239–3244CrossRefGoogle Scholar
  6. Irifune T, Nishiyama N, Kuroda K, Inoue T, Isshiki M, Utsumi W, Funakoshi K, Urakawa S, Uchida T, Katsura T, Ohtaka O (1998) The postspinel phase boundary in Mg2SiO4 determined by in situ X-ray diffraction. Science 279:1698–1700CrossRefPubMedGoogle Scholar
  7. Jamieson JC, Fritz JN, Manghnani MH (1982) Pressure measurement at high temperature in X-ray diffraction studies: gold as a primary standard. In: Akimoto S, Manghnani MH (eds) High pressure research in geophysics. Center for Academic Publishing, Tokyo, pp 27–48Google Scholar
  8. Katsura T, Ito E (1989) The system Mg2SiO4–Fe2SiO4 at high pressures and temperatures: precise determination of stabilities of olivine, modified spinel, and spinel. J Geophys Res 94:15663–15670CrossRefGoogle Scholar
  9. Katsura T, Funakoshi K, Kubo A, Nishiyama N, Tange Y, Sueda Y, Kubo T, Utsumi W (2004) A large-volume high-pressure and high-temperature apparatus for in situ X-ray observation, ‘SPEED-Mk.II’. Phys Earth Planet Inter 143–144:497–506CrossRefGoogle Scholar
  10. Kuroda K, Irifune T, Inoue T, Nishiyama N, Miyashita M, Funakoshi K, Utsumi W (2000) Determination of phase boundary between ilmenite and perovskite in MgSiO3 by in situ X-ray diffraction and quench experiments. Phys Chem Miner 27:523–532CrossRefGoogle Scholar
  11. Matsui M, Nishiyama N (2002) Comparison between the Au and MgO pressure calibration standards at high temperature. Geophys Res Lett 29:No. 0, 10.1029/2001GL014161Google Scholar
  12. Matsui M, Parker SC, Leslie M (2000) The MD simulation of the equation of state of MgO: application as a pressure calibration standard at high temperature and high pressure. Am Miner 85:312–316Google Scholar
  13. Ringwoode AE, Major A (1970) The system Mg2SiO4–Fe2SiO4 at high pressures and temperatures. Phys Earth Planet Inter 3:89–108CrossRefGoogle Scholar
  14. Shim S, Duffy TS, Takemura K (2002) Equation of state of gold and its application to the phase boundaries near 660 km depth in the Earth’s mantle. Earth Planet Sci Lett 203:729–739CrossRefGoogle Scholar
  15. Suzuki A, Ohtani E, Morishima H, Kubo T, Kanbe Y, Kondo T, Okada T, Terasaki H, Kato T, Kikegawa T (2000) In situ determination of the boundary between wadsleyite and ringwoodite in Mg2SiO4. Geophys Res Lett 27:803–806CrossRefGoogle Scholar
  16. Tsuchiya T (2003) First-principles prediction of the PVT equation of state of gold and the 660-km discontinuity in Earth’s mantle. J Geophys Res 108: No. B10, 2462, doi:10.1029/2003JB002446Google Scholar
  17. Utsumi W, Funakoshi K, Urakawa S, Yamakata M, Tsujii K, Koshino H, Shimomura O (1998) SPring-8 beamlines for high pressure science with multi-anvil apparatus. Rev High Press Sci Technol 7:1484–1486Google Scholar

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • T. Inoue
    • 1
  • T. Irifune
    • 1
  • Y. Higo
    • 1
  • T. Sanehira
    • 1
  • Y. Sueda
    • 1
  • A. Yamada
    • 1
  • T. Shinmei
    • 1
  • D. Yamazaki
    • 1
  • J. Ando
    • 2
  • K. Funakoshi
    • 3
  • W. Utsumi
    • 4
  1. 1.Geodynamics Research CenterEhime UniversityMatsuyamaJapan
  2. 2.Department of Earth and Planetary System SciencesHiroshima UniversityHiroshimaJapan
  3. 3.Japan Synchrotron Radiation Research InstituteHyogoJapan
  4. 4.Japan Atomic Energy Research InstituteHyogoJapan

Personalised recommendations