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Clinopyroxenes from the Square Top intrusion, Nundle, New South Wales

Published online by Cambridge University Press:  14 March 2018

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

Despite a wide range in parent rock compositions, from analcime-olivine theralite to analcime-tinguaite, clinopyroxene phenocrysts in the Square Top intrusion show limited compositional variation. The crystallization trend of the pyroxenes (principally sahlites) lies approximately parallel to the diopside-hedenbergite join of the pyroxene quadrilateral, and in addition reveals slight enrichment in acmite. The limited iron enrichment in the pyroxenes (and in olivine phenocrysts in the theralites and tinguaites) stemmed from progressively more hydrous liquid fractions whose ferric/ferrous iron ratios increased during differentiation.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 276 , December 1966 , pp. 1061 - 1070
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1966

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