Uranium and thorium abundances in Indian kimberlites

Details Uranium and thorium abundances in Indian kimberlites Uranium and thorium abundances in Indian kimberlites

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41..335p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 41, Issue 2, pp.335-339

Computer Science

1

Scientific paper

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 P 2 O 5 and U and Th. Model calculations suggest that enrichment of U involved considerable mantle reaction during ascent.

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