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

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...

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Main Author: Wood, B
Format: Journal article
Language:English
Published: 1990
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author Wood, B
author_facet Wood, B
author_sort Wood, B
collection OXFORD
description 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
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spelling oxford-uuid:1eb5adc2-7c36-4301-b477-c63cc4b467522022-03-26T11:17:52ZPostspinel 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. TakahashiJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:1eb5adc2-7c36-4301-b477-c63cc4b46752EnglishSymplectic Elements at Oxford1990Wood, BIn 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
spellingShingle Wood, B
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
title 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
title_full 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
title_fullStr 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
title_full_unstemmed 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
title_short 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
title_sort 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
work_keys_str_mv AT woodb postspineltransformationsandthewidthofthe670kmdiscontinuityacommentonpostspineltransformationsinthesystemmg2sio4fe2sio4andsomegeophysicalimplicationsbyeitoandetakahashi