Sources of sandstone-type uranium ore of inter-mountain basin-Taking Tuha basin and Erlian basin as examples

The material sources of sandstone-type uranium in Tuha basin and Erlian basin are studied with microscopic identification, field observations and zircon dating analysis. The results show that, the ages of target layer zircon in Tuha basin mainly is (440.9±2.3) Ma, the purpose of layer sand provenance should be come from Caledonian gneissic granite intrusions, the main source of uranium come from the pre-concentration. In Erlian basin, source material mainly comes from the ancient river upstream and both sides of the rock. The main source of uranium comes from weathered rock, pyroclastic rocks also provide additional enrichment of uranium. And on this basis, the control and influence of uranium source conditions of mountain basins are analysed. (authors)