Rhenium in the Dictyonema shale of the Baltic basin

The data on the Re-bearing Dictyonema shale in the Baltic basin within the Leningrad Region are reported. The material and petrographic black-shale composition is studied to establish rhenium identification features, Dictyonema shale formation conditions, and the effect of volcanism on the development of rhenium mineralization. The relationship of rhenium with other metals, especially, uranium, is investigated.