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This article analyzes the petrological characteristics，geochemical features，provenance composition，structural background, and sedimentary environment of uranium bearing sandstone in the lower member of the Toutunhe formation in the Louzhuangzi area by the methods of geochemical analysis，microscopic identification and core observation，and preliminarily explores their relationship with uranium mineralization. The results show that the tectonic background of the ore-bearing sandstone source rocks in the lower member of the Toutunhe formation is mainly the active continental margin and the passive continental margin. The special tectonic background provided favorable conditions for the migration of uranium. The source of sandstone debris was dominated by neutral igneous rock，and the parent rock was mainly calc-alkaline granite with a small amount of pyroclastic rock，sedimentary rock and metamorphic rock，which indicated the sandstone from multi-source nature，and has a good uranium source. The sandstone formed in a warm and humid paleoclimate and the source rock was strongly weathered. The sandstone is rich in reducing medium，reflecting that the lower member of Toutunhe formation was in a reducing environment and has good primary reduction ability. The content of major elements of the sandstone debris in the target layer has the characteristics of rich alkali，high silicon and weak aluminum，and the ore-bearing sandstone are of lower w(SiO2) and w(Al2O3) and higher w(CaO) than those of the sterile sandstone. The difference of component content in the sand body of the ore-bearing member is characterized by strong clay alteration and carbonate development. U，Mo and Se are relatively enriched，and other trace elements are relatively depleted except for Ga，which is comparable to the sedimentary rocks in China. The content of trace elements in ore-bearing samples of the same borehole is generally higher than that in sterile samples， U，Mo，Se，V，Ge，Ti，Sc and Y are significantly increased, which indicated that the trace elements in the sand body of the target layer also have migrated and enriched in the uranium mineralization process.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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