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

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Age of Allanite from Kabbaldurga Quarry, Karnataka


Affiliations
1 Institut fur Mineralogie, Ruhr-Universitat, Postfach 102148, D-4630 Bochum 1, F.R.G., Germany
2 Geosciences Program, P.O. Box 688, University of Texas - Dallas, Richardson, Texas 75080, United States
 

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Allanite from a pegmatitic veinlet cutting an amphibolite lens in Peninsular gneiss at Kabbaldurga Quarry yields the following ages (in million of years): 207Pb/235U-2507, 206Pb/238U-2520, and 208Pb/Th-2887. The U-Pb ages date the high-grade metamorphism and emplacement of the Closepet granite at Kabbaldurga at close to 2500 million years ago.
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  • Age of Allanite from Kabbaldurga Quarry, Karnataka

Abstract Views: 200  |  PDF Views: 141

Authors

Edward S. Grew
Institut fur Mineralogie, Ruhr-Universitat, Postfach 102148, D-4630 Bochum 1, F.R.G., Germany
William I. Manton
Geosciences Program, P.O. Box 688, University of Texas - Dallas, Richardson, Texas 75080, United States

Abstract


Allanite from a pegmatitic veinlet cutting an amphibolite lens in Peninsular gneiss at Kabbaldurga Quarry yields the following ages (in million of years): 207Pb/235U-2507, 206Pb/238U-2520, and 208Pb/Th-2887. The U-Pb ages date the high-grade metamorphism and emplacement of the Closepet granite at Kabbaldurga at close to 2500 million years ago.