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A method of tracing the temperature and oxygen-fugacity histories of complex magnetite-ilmenite grains

Published online by Cambridge University Press:  05 July 2018

John F. W. Bowles
John F. W. Bowles*
Affiliation:
Department of Geology, University College, London EC1E 6BT
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Summary

The formation of ilmenite from titanomagnetite frequently shows separate generations of production. The ilmenite products can be combined with the magnetite host to represent the intermediate stages in this development. Use of the Buddington and Lindsley (1964) geothermometer in conjunction with this method provides a number of points in the temperature and oxygen-fugacity history of a single, complex magnetiteilmenite grain.

Application of the method is illustrated by an example from the Freetown layered gabbro. A titanomagnetite exsolved granular ilmenite whilst cooling and this process ceased at 930° and an oxygen fugacity of log ƒO2 = −11·5. Further cooling and exsolution continued until the grain reached 662 °C and log ƒO2 = −19·0, producing distinct ilmenite lamellae.

Type
Research Article
Information
Mineralogical Magazine , Volume 41 , Issue 317 , March 1977 , pp. 103 - 109
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1977

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Footnotes

1

Present address: Institute of Geological Sciences, 64-78 Gray's Inn Road, London WC1X 8NG.

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