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The charnockite series of Amaravathi, Gunter District, Andhra Pradesh, South India

Published online by Cambridge University Press:  01 May 2009

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

The charnockite series consisting of pyroxene granulites and charnockites are not formed by magmatic differentiation, although both units had their antecedents in igneous material. The solid-state recrystallization of pyroxene granulite and the liquid-state crystallization of charnockite are inferred from the field criteria. The pyroxene granulites with the associated paragneisses are formed from the original sedimentary-volcanic sequence under granulite facies of metamorphism. The magmatic charnockites emplaced into these rocks resulting in the development of intermediate varieties by the partial assimilation and incorporation of the pyroxene granulites. The stability of the minerals is not affected by this migmatization, which is therefore thought to have taken place under granulite facies conditions. The evolutionary trend of the charnockite series is one of retrogression from the earlier granulite facies to the later almandine-amphibolite facies, caused by the subsequent granite invasion.

Type
Articles
Information
Geological Magazine , Volume 110 , Issue 2 , March 1973 , pp. 171 - 184
Copyright
Copyright © Cambridge University Press 1973

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