Uranium and thorium abundances in Indian kimberlites |
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Authors: | DK Paul NH Gale PG Harris |
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Institution: | 1. Department of Earth Sciences, The University, Leeds, England;2. Department of Earth Sciences, The University, Leeds, England;3. Department of Geology and Mineralogy, Parks Road, Oxford, England |
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Abstract: | Abundances of U and Th have been determined in 21 kimberlites from India by delayed fission neutron technique. Whole-rock U ranges from 1.87 to 3.93 ppm but Th shows wider variation from 14.02 to 60.44 ppm. Average Th/U ratios in three main diatremes are 7.9, 8.8 and 10.0. The interrelationships between U, Th and K are variable and complex. A positive correlation exists between P2O5 and U and Th. Model calculations suggest that enrichment of U involved considerable mantle reaction during ascent. |
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