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Rocks of unusual chemistry in the charnockitic terrains of India, and their geological significance

Published online by Cambridge University Press:  01 May 2009

S. Viswanathan
S. Viswanathan
Affiliation:
Atomic Minerals DivisionDepartment of Atomic Energy1-11-252/1, BegumpetHyderabad-500016India
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Summary

The paper reports the occurrence in the 2.9–3.1 B.Y. old charnockitic terrains of Southern India of some basic charnockites that are strikingly similar, chemically, to basaltic komatiite from the 3.4 B.Y. old Barberton greenstone belt of Southern Africa, and suggests that the pre-metamorphic evolution of Archaean charnockitic terrains followed the same trends that characterized the development of Archaean greenstone belts. The main events in the evolution of one such terrain, the ‘Madras granulite belt’, before it was subjected to granulite facies meamorphism some 2.6 B.Y. ago, is outlined in Table 2.

Type
Articles
Information
Geological Magazine , Volume 112 , Issue 1 , January 1975 , pp. 63 - 69
Copyright
Copyright © Cambridge University Press 1975

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