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Potash-trachytes and ultra-potassic rocks associated with the carbonatite complex of the Toror Hills, Uganda

Published online by Cambridge University Press:  14 March 2018

D. S. Sutherland
D. S. Sutherland*
Affiliation:
Department of Geology, The University, Leicester
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Summary

Rocks containing a high percentage of potash feldspar are described for the first time from the Toror Hills in the Karamoja district of eastern Uganda. They include feldspathic fenites, intrusive feldspathic fenite-breccias, potashtrachytes, and orthoclasites. Petrographic data and chemical analyses show the close similarity in composition of these rocks despite their widely differing textures and modes of occurrence. The potash metasomatism associated with the emplacement of carbonatite, and the subsequent mobilization of these feldspathic fenites are compared with similar phenomena observed at other carbonatite centres. The problem of the mechanism of mobilization is discussed.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 35 , Issue 270 , June 1965 , pp. 363 - 378
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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