Distribution of radioactive isotopes in rock and ore of Arkhangelskaya pipe from the Arkhangelsk diamond province |
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| Authors: | G P Kiselev E Yu Yakovlev S V Druzhinin A S Galkin |
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| Institution: | 1.Institute of Geodynamics and Geology, Laverov Federal Research Center for Comprehensive Study of the Arctic Region,Russian Academy of Sciences,Arkhangelsk,Russia;2.OAO Severalmaz,Arkhangelsk,Russia |
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| Abstract: | The contents of radioactive elements and the uranium isotopic composition of kimberlite in the Arkhangelskaya pipe at the M.V. Lomonosov deposit and of nearby country rocks have been studied. A surplus of 234U isotope has been established in rocks from the near-pipe space. The high γ = 234U/238U ratio is controlled by the geological structure of the near-pipe space. A nonequilibrium uranium halo reaches two pipe diameters in size and can be regarded as a local ore guide for kimberlite discovery. The rocks in the nearpipe space are also characterized by elevated or anomalous U, Th, and K contents with respect to the background. |
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