Fission-track ages and uranium concentration in garnets from Rajasthan, India
Fission-track ages determined from garnets in pegmatite and garnetiferous amphibolite from Bhilwara and Ajmer districts of Rajasthan range from 900 m.y. to 1,370 m.y. They date the time of formation of the pegmatites (about 1,000 m.y. B.P.) and the metamorphism during F 1 (∼1,400 m.y. B.P.) folding in the area. The uranium content of the garnets varies from 1.76 × 10 −8 g/g to 21.4 × 10 −8 g/g.