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Heating experiments on some natural titaniferous magnetites

Published online by Cambridge University Press:  14 March 2018

E. A. Vincent ,
J. B. Wright ,
R. Chevallier  and
Suzanne Mathieu
E. A. Vincent
Affiliation:
Department of Geology and Mineralogy, University Museum, Oxford
J. B. Wright
Affiliation:
Department of Geology and Mineralogy, University Museum, Oxford
R. Chevallier
Affiliation:
Institut de physique, Université de Nancy
Suzanne Mathieu
Affiliation:
Institut de physique, Université de Nancy
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Summary

Chemically analysed samples of magnetites carrying exsolved ulvöspinel and ilmenite have been heated in vacuo at various temperatures without change in overall chemical composition and the changes occurring studied microscopically, magnetically, and by X-rays.

Magnetite with exsolution bodies of ulvöncl can be homogenized probably below 600°C.; thermomagnetic curves and microscopic textures suggest that the solvus curve is very steep at the Fe3O4 end of the Fe3O4-Fe2TiO4 series.

On heating magnetite containing ilmenite lamellae up to 950°C., some interchange of ions between the phases occurs (Fe3O4+FeTiO3 → Fe2TiO4+Fe2O3, the ilmenite lamellae taking Fe2O3 into solid solution. The accompanying host magnetite not only gains Fe2TiO4, but at the same time dissolves some FeTiO3. Above 950°C. extensive decomposition takes place, with the production of pseudobrookite, and homogenization has not been achieved. It is suggested that under magmatic conditions extensive solid solution exists in which the FeTiO3 component may be regarded as having a spinel (γ) structure; after exsolution, monotropic inversion may occur to yield a rhombohedral ferri-ilmenite (Chevallier et al., 1955), which on slow cooling changes in composition towards FeTiO3.

Magnetite with exsolution bodies of both ulvöspinel and il menite shows on heating the features of both the above binary types.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 31 , Issue 239 , December 1957 , pp. 624 - 655
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1957

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