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Zoned plagioclase from the charnockites of Kondapalli, Krishna district, Andhra Pradesh, India

Published online by Cambridge University Press:  14 March 2018

C. Leelanandam
C. Leelanandam*
Affiliation:
Department of Mineralogy and Petrology, Downing Place, Cambridge
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Summary

Zoning in plagioclase is reported from the charnockitic rocks of Kondapalli, Krishna district, Andhra Pradesh, India, for the first time. Electronprobe studies indicate that the zoned plagioclases consist of homogeneous sodic cores mantled by thin calcic shells, which show continuous zoning of the inverse type. Partial chemical analyses of twelve density fractions of the zoned plagioclase from a basic charnockite exhibit a wide variation in An content from 54·80 to 72·39 %; X-ray studies suggest that they possess ‘fixed’ transitional structural state.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 282 , June 1968 , pp. 805 - 813
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1968

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