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Chemical variation of clinopyroxene phenocrysts from the trachybasaltic lavas of Mount Etna, Sicily

Published online by Cambridge University Press:  05 July 2018

A. M. Duncan  and
R. M. F. Preston
A. M. Duncan
Affiliation:
Geology Section, Department of Science, Luton College of Higher Education, Luton LU1 3JU
R. M. F. Preston
Affiliation:
Department of Geology, University College London, Gower Street, London WC1E 6BT
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Summary

The chemical variation of clinopyroxene phenocrysts from the trachybasaltic lavas of Etna volcano is described. The phenocrysts show a limited, but distinct trend in chemical variation from calcic-augite in the hawaiites to augite in the benmoreites. The trend of this variation is unusual, being one of Mg-enrichment with differentiation of the magma. Ca shows a steady decrease in the clinopyroxenes from the hawaiites to the benmoreites. Na, however, shows little chemical variation in the pyroxenes. The trace element chemistry is briefly examined. The clinopyroxenes show well-developed oscillatory and sector zoning. The basal {11} sectors are enriched in Si and Mg and depleted in Ti, Al, and Fe relative to the {100}, {110}, and {010} prism sectors.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 330 , June 1980 , pp. 765 - 770
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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