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Isotopic ages of the basic charnockite and khondalite from Kondapalli, Andhra Pradesh, India

Published online by Cambridge University Press:  14 March 2018

R. L. Grasty  and
C. Leelanandam
R. L. Grasty
Affiliation:
Department of Geodesy and Geophysics, University of Cambridge
C. Leelanandam
Affiliation:
Department of Mineralogy and Petrology, University of Cambridge
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Summary

The isotopic ages of three biotites from the Kondapalli area, Andhra Pradesh, India, have been determined by the 40Ar/40K method. The results (440–524 Myr) indicate that the basic charnockite and khondalite of pre-Cambrian age have been subjected to at least one subsequent metamorphism the age of which must be 440 Myr or younger. The significance of the results is discussed in the light of the available geochronological evidence from Peninsular India.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 35 , Issue 271 , September 1965 , pp. 529 - 535
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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