Placer diamond potential of the siberian craton: possible sources and ages |
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| Authors: | V P Afanasiev N P Pokhilenko S S Lobanov |
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| Institution: | 1.Sobolev Institute of Geology and Mineralogy,Siberian Branch of the Russian Academy of Sciences,Novosibirsk,Russia |
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| Abstract: | Many diamond placers in the Siberian craton are heterogeneous consisting of several components that differ in origin and ages
of the source. The diamonds are either kimberlite-hosted or are exotic varieties which occur mostly in the northeastern craton
periphery and come from primary deposits of unknown types and ages. The two groups of diamond placers in the area represent
two evolution trends: those found in Middle Paleozoic kimberlites originated in the Famennian and the exotic diamond groups
became involved in sedimentation in the Carnian. The trends have been associated with successive weathering of older diamond
hosts and redeposition of the minerals into younger sediments. Having joined since the Late Triassic, the two trends eventually
produced a polygenetic and multistage mixture of diamond groups in placers. |
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