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Ortho- and Clino-Pyroxenes from the Charnockite Series of Amaravathi, Andhra Pradesh, South India

Published online by Cambridge University Press:  05 July 2018

A. Ramaswamy  and
M. S. Murty
A. Ramaswamy
Affiliation:
Department of Geology, S.V.: University, Tirupati, South India
M. S. Murty
Affiliation:
Department of Geology, S.V.: University, Tirupati, South India
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Summary

The chemical analyses, structural formulae, and optical data of seven orthopyroxenes and six clinopyroxenes, all from the charnockite series of Amaravathi, are presented. The orthopyroxenes are in the hypersthene-ferrohypersthene range while the clinopyroxenes are in the sahlite range. The aluminous nature of the pyroxene is believed to be the result of high pressure. The clinopyroxenes have the granulite trend on the Wo-En-Fs plot. The tie-line projections and the KD values for the pyroxene pairs indicate conditions of chemical equilibrium around 670 °C for the charnockite series of Amaravathi.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 301 , March 1973 , pp. 74 - 77
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1973

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