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Geochemistry of post-Dharwar basic dikes and the Precambrian crustal evolution of peninsular India

Published online by Cambridge University Press:  01 May 2009

S. M. Naqvi ,
V. Divakara Rao ,
K. Satyanarayana  and
S. M. Hussain
S. M. Naqvi
Affiliation:
National Geophysical Research InstituteHyderabad-500007India
V. Divakara Rao
Affiliation:
National Geophysical Research InstituteHyderabad-500007India
K. Satyanarayana
Affiliation:
National Geophysical Research InstituteHyderabad-500007India
S. M. Hussain
Affiliation:
National Geophysical Research InstituteHyderabad-500007India
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Summary

The post-Dharwar basic dikes from Chitaldrug and Shimoga schist belts have been analysed to determine their major, minor and trace-element composition. The comparison of the results from these formations (1.4–0.95 b.y.) with those of the early Precambrian metabasalts (2.4 b.y.), which are indicative of a thin crust at the time of their extrusion shows significant differences between them. Utilizing this and results of similar studies on corresponding formations it is suggested that the present thickness of this part of the crust might have been obtained after the extrusion of the early Precambrian basalts and before the intrusion of the middle Precambrian dolerites.

Type
Articles
Information
Geological Magazine , Volume 111 , Issue 3 , May 1974 , pp. 229 - 236
Copyright
Copyright © Cambridge University Press 1974

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