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Unusual perovskite textural relationships in olivine melilitites from Namaqualand-Bushmanland, South Africa

Published online by Cambridge University Press:  05 July 2018

A. E. Moore
A. E. Moore*
Affiliation:
Department of Geology, University of the Western Cape, Bellville, South Africa
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Abstract

Textural relationships shown by oxide phases in olivine melilitites from Namaqualand-Bushmanland, South Africa, indicate early crystallization of picroilmenite from a relatively reduced magma. Evolution of a CO2-rich vapour during magma ascent led to an increase in oxygen activity and liquidus temperatures, causing rapid crystallization of titanomagnetite. Higher oxygen activities, together with the increase in calcium activity following CO2 loss from the magma, resulted in perovskite replacing ilmenite as the stable Ti phase.

Type
Research Article
Information
Mineralogical Magazine , Volume 44 , Issue 334 , June 1981 , pp. 147 - 150
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1981

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Footnotes

*

Present address: Falconbridge Explorations (Botswana), PO Box 1463; Gaborone, Botswana.

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