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The nature and significance of exsolved phases in some chrome spinels from the Rhum layered intrusion

Published online by Cambridge University Press:  05 July 2018

A. Putnis  and
G. D. Price
A. Putnis
Affiliation:
Mineral Sciences Group, Department of Mineralogy and Petrology, Downing Place Cambridge CB2 3EW
G. D. Price
Affiliation:
Mineral Sciences Group, Department of Mineralogy and Petrology, Downing Place Cambridge CB2 3EW
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Summary

Chrome spinels from seams in the Rhum layered intrusion, Inner Hebrides, generally contain very fine platelets of exsolved phases. Despite the low bulk Ti content (< 1%) of the spinel grains, analytical electron microscopy shows these platelets to be highly enriched in titanium. Electron diffraction indicates the presence of platelets of two different phases, one a magnesian ilmenite, the other a defect spinel intermediate phase. The platelets are the result of oxidation of the spinel at moderate (c. 600 °C) temperatures and their distribution suggests that oxygen fugacity gradients existed across some of the seams.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 328 , December 1979 , pp. 519 - 526
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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