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Authors
Affiliations
1 Geological Survey of India, Southern Region, Hyderabad-500001, IN
2 Institute of Nuclear Research of the Hungarian Academy of Sciences, H 4001, Debrecen 1, Pf. 51, HU
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 20, No 6 (1979), Pagination: 290-296
Abstract
Garnet-sillimanite-graphite gneiss (khondalite) from Puri district, Orissa has given an age of 3090 m.y. while another sample of similar composition from Yerada hill near Visakhapatnam has yielded an age of 2482 m.y. A sample of garnetiferous hypersthene gneiss from Kasipatnam in Visakhapatnam district is found to be 2695 m.y. in age and a feldspathised variety of the same rock has yielded an age of 2129 m.y. indicating the feldspathisation process to be a later event. The present paper highlights a hitherto unreported granitic activity around 816 ± 40 m.y. in the Eastern Ghats area.
