Postspinel transformations and the width of the 670-km discontinuity

a comment on "Postspinel transformations in the system Mg2SiO4-Fe2SiO4 and some geophysical implications' by E. Ito and E. Takahashi

Bernard J. Wood

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

In their recent paper dealing with postspinel transformations in the system Mg2SiO4-Fe2SiO4, Ito and Takahashi [1989] showed that the reaction (Mg,Fe)2SiO4 = (Mg,Fe)SiO3 + (Mg,Fe)O (spinel = perovskite + magnesiowustite) occurs over a very narrow pressure interval, at 1600°C, for values of Fe/(Fe+Mg) of between 0.0 and 0.3. It is the purpose of this comment to point out that the argument for a narrow transition interval can be independently confirmed and strengthened using Ito and Takahashi's data on Fe-Mg partitioning between the phases spinel, perovskite, and magnesiowustite. Ito and Takahashi's contention that the postspinel transition in (Mg,Fe)2SiO4 is sharp enough to produce the major, or sole, contribution to the 670 km discontinuity is reinforced. -from Author

Original languageEnglish
Pages (from-to)12681-12685
Number of pages5
JournalJournal of Geophysical Research
Volume95
Issue numberB8
DOIs
Publication statusPublished - 1990
Externally publishedYes

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