The Study On The Relationship Between The Geologic Structure Of Sichuan Basin And Sandstone-Type Uranium Mineralization

In a world, the sandstone-type uranium deposit is currently important uranium product, its resource that be proved up is more than one-quarter of the resource all over the world. it holds the balance in the uranium resource. From the middle of the nineties, the in-situ leachable sandstone-type uranium deposits is main type in my country, that we search for. From Mesozoic to Cenozoic era, The Sichuan basin is the biggest one of terrestrial basins in the southwest region. The predecessor discovered four medium and small-sized the sandstone-type uranium deposits in the Cretaceous stratum in the north of Sichuan basin. But it can' t be leached in-situ because the calcareous cement in the mineralize sandstone is compaction.The foreground is payed more attention to whether or not the other area have the sandstonge-type uranium deposit the aside from the north of Sichuan basin, especially the in-situ leachable sandstone-type.In this thesis, the relationship between the geologic structure (folds, faults, oil-gas structure, ancient uphearal) of Sichuan basin and the sandstonge-type uranium deposit is studied on the base of the regional geological background and minerogenic condition of the Sichuan basin.On base of contrasting and analysising the pattern of structure metallogeny of the sandstonge-type uranium deposit in home (Yili,Xijiang and Ordos basin ,Neimenggu) and abroad (the basin in the middle of Asian), it sets forth the minerogenic condition of the Sichuan basin, the tectonic condition in particular, and set up the pattern of structure metallogeny of the sandstonge-type uranium deposit.Tectonic metallogenic pattern: on the favorable conditions of uranium source , rock facies , lithological character, hydrological geology, topographic and morphologial in basin , seeking wings of broad anticline or syncline (below hydrocarbon tectonic ) active sedimentary basin area in platform or intermontane basin along sub-orogenic zone. seeking cover fault which connect base fault in run-off area at wings. ore-bearing bed near cover fault is the most favorable sector .It should mainly seek local interlayered oxidized zone sand type uranium deposit in SiChuan basin .partial areas possess the metallogenic conditionsand of type uranium deposit in center basin. A few area possess the metallogenic condition of the in-situ leachable sandstone-type uranium deposits. main areas are Weiyuan uplift peripheral area., Guangan-Nanchong area .Longtan syncline and Luxian depression.