The effect of alumina on phase transformations at the 660-kilometer discontinuity from Fe-Mg partitioning experiments
Experimental data on the partitioning of Fe and Mg between coexisting silicate perovskite, magnesiowustite, and γ-(Mg,Fe)2SiO4 demonstrate that Fe substitution in perovskite is strongly coupled to Al2O3 concentration. In Al2O3-free compositions, perovskite has a low Fe/(Fe+Mg) ratio: for a bulk Fe/(...
| Main Authors: | , |
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| Format: | Journal article |
| Language: | English |
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1996
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| _version_ | 1797086304647774208 |
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| author | Wood, B Rubie, D |
| author_facet | Wood, B Rubie, D |
| author_sort | Wood, B |
| collection | OXFORD |
| description | Experimental data on the partitioning of Fe and Mg between coexisting silicate perovskite, magnesiowustite, and γ-(Mg,Fe)2SiO4 demonstrate that Fe substitution in perovskite is strongly coupled to Al2O3 concentration. In Al2O3-free compositions, perovskite has a low Fe/(Fe+Mg) ratio: for a bulk Fe/(Fe+Mg) of 0.11, perovskite has a value close to 0.04, whereas magnesiowustite has a ratio near 0.17. In peridotitic mantle, however, where the perovskite should contain 4 to 5 weight percent Al2O3, it has essentially the same Fe/(Fe+Mg) ratio as coexisting magnesiowustite. Under lower mantle conditions, therefore, perovskite and magnesiowustite should, in peridotite, each have an Fe/(Fe+Mg) ratio close to 0.11. |
| first_indexed | 2024-03-07T02:20:09Z |
| format | Journal article |
| id | oxford-uuid:a3a33fb4-bbb9-4d89-b80d-cf35a1778aac |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:20:09Z |
| publishDate | 1996 |
| record_format | dspace |
| spelling | oxford-uuid:a3a33fb4-bbb9-4d89-b80d-cf35a1778aac2022-03-27T02:28:23ZThe effect of alumina on phase transformations at the 660-kilometer discontinuity from Fe-Mg partitioning experimentsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:a3a33fb4-bbb9-4d89-b80d-cf35a1778aacEnglishSymplectic Elements at Oxford1996Wood, BRubie, DExperimental data on the partitioning of Fe and Mg between coexisting silicate perovskite, magnesiowustite, and γ-(Mg,Fe)2SiO4 demonstrate that Fe substitution in perovskite is strongly coupled to Al2O3 concentration. In Al2O3-free compositions, perovskite has a low Fe/(Fe+Mg) ratio: for a bulk Fe/(Fe+Mg) of 0.11, perovskite has a value close to 0.04, whereas magnesiowustite has a ratio near 0.17. In peridotitic mantle, however, where the perovskite should contain 4 to 5 weight percent Al2O3, it has essentially the same Fe/(Fe+Mg) ratio as coexisting magnesiowustite. Under lower mantle conditions, therefore, perovskite and magnesiowustite should, in peridotite, each have an Fe/(Fe+Mg) ratio close to 0.11. |
| spellingShingle | Wood, B Rubie, D The effect of alumina on phase transformations at the 660-kilometer discontinuity from Fe-Mg partitioning experiments |
| title | The effect of alumina on phase transformations at the 660-kilometer discontinuity from Fe-Mg partitioning experiments |
| title_full | The effect of alumina on phase transformations at the 660-kilometer discontinuity from Fe-Mg partitioning experiments |
| title_fullStr | The effect of alumina on phase transformations at the 660-kilometer discontinuity from Fe-Mg partitioning experiments |
| title_full_unstemmed | The effect of alumina on phase transformations at the 660-kilometer discontinuity from Fe-Mg partitioning experiments |
| title_short | The effect of alumina on phase transformations at the 660-kilometer discontinuity from Fe-Mg partitioning experiments |
| title_sort | effect of alumina on phase transformations at the 660 kilometer discontinuity from fe mg partitioning experiments |
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