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Minerals 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 potash feldspar in the charnockites is orthoclase and they are inferred to have been formed around 700 °C. A twin-law study of the plagioclase indicates an igneous origin of the charnockites and pyroxene granulites. The KD values of the coexisting pyroxenes in the granulites are appropriate to equilibrium at 670 °C. A substantial substitution of A1 for Si in the values of the coexisting pyroxenes in the granulites are appropriate to equilibrium at 670 °C. A substantial substitution of A1 for Si in the Z group in all mafic minerals studied also indicates relatively high temperatures of formation. Almandine is pyroperich, a result of high pressure. The charnockites and pyroxene granulites are inferred to be formed under conditions of high pressure and temperature.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 307 , September 1974 , pp. 807 - 810
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1974

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