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A discussion of carbonatite evolution and nomenclature, and the generation of sodic and potassic fenites

Published online by Cambridge University Press:  05 July 2018

A. R. Woolley
A. R. Woolley*
Affiliation:
Department of Mineralogy, British Museum (Natural History), Cromwell Road, London SW7 5BD
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Abstract

Possible evolutionary paths of alkali-rich carbonatite magma may be related to the production of sodic and potassic fenites. It is concluded that the latter are generated not from separate Na- and K-rich carbonatites, but by the earlier preferential loss of Na from a sodi-potassic carbonatite magma. Trends of both Fe and Mg enrichment in carbonatites are illustrated from a number of centres, and ascribed to crystal fractionation, although metasomatism may be partly responsible. Current nomenclature of carbonatites is unsatisfactory and a division into sövites, magnesiocarbonatites and ferrocarbonatites is proposed, based on rock chemistry.

Type
Research Article
Information
Mineralogical Magazine , Volume 46 , Issue 338 , March 1982 , pp. 13 - 17
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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