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

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Lead Isotopic Ratios of Uraninites and the Age of Uranium Mineralization in Singhbhum Shear Zone, Bihar


Affiliations
1 Ore Dressing Section, Bhabha Atomic Research Centre, 3rd floor, Chandralok, 111, Sarojini Devi Road, Secunderabad 500003 (A.P.), India
2 Radiochemistry Division, B.A.R.C. Trombay, Bombay 400085, India
 

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The lead isotopic ratios of four samples of uraninites from different parts of Singhbhum Shear Zone, Bihar, gave discordant ages in the sequence 207pb/206pb age > 207Pb 235U age > 206Pb/238U age. However, the 207pb/206pb ages of all the four samples gave fairly concordant values. Those from Bhatin, Rakha and Surda gave 1478 ± 14 m. years and that From Narwapahar 1580 m. years. The discordant ratios gave a concordia age of 1580 m. years, which can be taken as the age of original deposition of uraninite in the shear zone.
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  • Lead Isotopic Ratios of Uraninites and the Age of Uranium Mineralization in Singhbhum Shear Zone, Bihar

Abstract Views: 201  |  PDF Views: 125

Authors

N. Krishna Rao
Ore Dressing Section, Bhabha Atomic Research Centre, 3rd floor, Chandralok, 111, Sarojini Devi Road, Secunderabad 500003 (A.P.), India
S. K. Aggarwal
Radiochemistry Division, B.A.R.C. Trombay, Bombay 400085, India
G. V. U. Rao
Ore Dressing Section, Bhabha Atomic Research Centre, 3rd floor, Chandralok, 111, Sarojini Devi Road, Secunderabad 500003 (A.P.), India

Abstract


The lead isotopic ratios of four samples of uraninites from different parts of Singhbhum Shear Zone, Bihar, gave discordant ages in the sequence 207pb/206pb age > 207Pb 235U age > 206Pb/238U age. However, the 207pb/206pb ages of all the four samples gave fairly concordant values. Those from Bhatin, Rakha and Surda gave 1478 ± 14 m. years and that From Narwapahar 1580 m. years. The discordant ratios gave a concordia age of 1580 m. years, which can be taken as the age of original deposition of uraninite in the shear zone.