Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Biotite separates from three granite plutons in the Northern part of the Kerala region, namely, Kalpatta. Ambalavayal and Thaluru yield K-Ar ages of 512±20 m.y., 560±30 m.y. and 710±20 m y. respectively. The age data are comparable with those reported for similar granitic intrusives of the south Indian region.
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