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Residual glasses from some alkali basaltic lavas from New South Wales

Published online by Cambridge University Press:  14 March 2018

J. F. G. Wilkinson
J. F. G. Wilkinson*
Affiliation:
Department of Geology, The University of New England, Armidale, New South Wales
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Summary

The glassy residua from an alkali olivine-basalt and a nephelinebasanite are respectively alkali trachytic and phonolitic in composition and contrast strongly with the compositions of the host rocks. The analysis of the glass from the alkali olivine-basalt reveals appreciable normative corundum, which is considered a consequence of the crystallization of excessive diopsidic clinopyroxene. This results in a deficiency in lime relative to alumina during the crystallization of much of the plagioclase. A consideration of the compositions of the glasses and the salic differentiates from alkaline basic intrusions indicates that the development of either trachyte or phonolite depends on differing degrees of undersaturation of the parental basic magmas.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 35 , Issue 274 , June 1966 , pp. 847 - 860
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1966

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