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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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