Olivine-wadsleyite transition in the system (Mg,Fe )2SiO4

Tomoo Katsura, Hitoshi Yamada, Osamu Nishikawa, Maoshuang Song, Atsushi Kubo, Toru Shinmei, Sho Yokoshi, Yoshitaka Aizawa, Takashi Yoshino, Michael J. Walter, Eiji Ito, Ken Ichi Funakoshi

Research output: Contribution to journalArticle

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Abstract

Phase relations of the olivine-wadsleyite transition in the system (Mg,Fe)2SiO4 have been determined at 1600 and 1900 K using the quench method in a Kawai-type high-pressure apparatus. Pressure was determined at a precision better than 0.2 GPa using in situ X-ray diffraction with MgO as a pressure standard. The transition pressures of the end-member Mg2SiO4 are estimated to be 14.2 and 15.4 GPa at 1600 and 1900 K, respectively. Partition coefficients for Fe and Mg between olivine and wadsleyite are 0.51 at 1600 K and 0.61 at 1900 K. By comparing the depth of the discontinuity with the transition pressure, the temperature at 410 km depth is estimated to be 1760 ± 45 K for a pyrolitic upper mantle. The mantle potential temperature is estimated to be in the range 1550-1650 K. The temperature at the bottom of the upper mantle is estimated to be 1880 ± 50 K. The thickness of the olivine-wadsleyite transition in a pyrolitic mantle is determined to be between 7 and 13 km for a pyrolitic mantle, depending on the efficiency of vertical heat transfer. Regions of rapid vertical flow (e.g., convection limbs), in which thermal diffusion is negligible, should have a larger transition interval than stagnant regions, where thermal diffusion is effective. This is in apparent contradiction to short-period seismic wave observations that indicate a maximum thickness of

Original languageEnglish
JournalJournal of Geophysical Research B: Solid Earth
Volume109
Issue number2
Publication statusPublished - Feb 10 2004

Fingerprint

wadsleyite
olivine
Earth mantle
mantle
transition pressure
Thermal diffusion
upper mantle
thermal diffusion
potential temperature
partition coefficient
Seismic waves
seismic wave
heat transfer
seismic waves
limb
discontinuity
limbs
temperature
convection
Temperature

Keywords

  • 410 km discontinuity
  • Composition of the mantle
  • Mantle geotherm
  • Olivine-wadsleyite transition
  • Phase relations

ASJC Scopus subject areas

  • Oceanography
  • Astronomy and Astrophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)
  • Geophysics
  • Geochemistry and Petrology

Cite this

Katsura, T., Yamada, H., Nishikawa, O., Song, M., Kubo, A., Shinmei, T., ... Funakoshi, K. I. (2004). Olivine-wadsleyite transition in the system (Mg,Fe )2SiO4. Journal of Geophysical Research B: Solid Earth, 109(2).

Olivine-wadsleyite transition in the system (Mg,Fe )2SiO4. / Katsura, Tomoo; Yamada, Hitoshi; Nishikawa, Osamu; Song, Maoshuang; Kubo, Atsushi; Shinmei, Toru; Yokoshi, Sho; Aizawa, Yoshitaka; Yoshino, Takashi; Walter, Michael J.; Ito, Eiji; Funakoshi, Ken Ichi.

In: Journal of Geophysical Research B: Solid Earth, Vol. 109, No. 2, 10.02.2004.

Research output: Contribution to journalArticle

Katsura, T, Yamada, H, Nishikawa, O, Song, M, Kubo, A, Shinmei, T, Yokoshi, S, Aizawa, Y, Yoshino, T, Walter, MJ, Ito, E & Funakoshi, KI 2004, 'Olivine-wadsleyite transition in the system (Mg,Fe )2SiO4', Journal of Geophysical Research B: Solid Earth, vol. 109, no. 2.
Katsura T, Yamada H, Nishikawa O, Song M, Kubo A, Shinmei T et al. Olivine-wadsleyite transition in the system (Mg,Fe )2SiO4. Journal of Geophysical Research B: Solid Earth. 2004 Feb 10;109(2).
Katsura, Tomoo ; Yamada, Hitoshi ; Nishikawa, Osamu ; Song, Maoshuang ; Kubo, Atsushi ; Shinmei, Toru ; Yokoshi, Sho ; Aizawa, Yoshitaka ; Yoshino, Takashi ; Walter, Michael J. ; Ito, Eiji ; Funakoshi, Ken Ichi. / Olivine-wadsleyite transition in the system (Mg,Fe )2SiO4. In: Journal of Geophysical Research B: Solid Earth. 2004 ; Vol. 109, No. 2.
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AU - Shinmei, Toru

AU - Yokoshi, Sho

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