Formation of metastable assemblages and mechanisms of the grain-size reduction in the postspinel transformation of Mg2SiO4

Tomoaki Kubo, Eiji Ohtani, Takumi Kato, Satoru Urakawa, Akio Suzuki, Yuichi Kanbe, Ken Ichi Funakoshi, Wataru Utsumi, Kiyoshi Fujino

研究成果: Contribution to journalArticle査読

33 被引用数 (Scopus)

抄録

An in situ X-ray observation of the postspinel transformation kinetics was made using intense synchroton radiation. We confirmed that Mg2SiO4 spinel transforms into fine lamellae of SiO2 stishovite and periclase, and/or MgSiO3 ilmenite and periclase as an intermediate step in the postspinel transformation. These metastable assemblages eventually disappear and form the stable assemblages of MgSiO3 perovskite and periclase. Initial grain size just after the postspinel transformation drastically changes with overpressure. Viscosity of the subducting slab into the lower mantle, which is thought to be deformed by grain-size-sensitive creep, would depend on overpressure needed for the postspinel transformation at geological time scale.

本文言語英語
ページ(範囲)807-810
ページ数4
ジャーナルGeophysical Research Letters
27
6
DOI
出版ステータス出版済み - 3 15 2000

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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