| 开鲁盆地砂岩型铀矿中黄铁矿与铀矿化成因关系探讨 |
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| 关键词:Yaojia Formation pyrite sulfur isotope sandstone type uranium deposit Kailu Basin |
| 基金项目:国家自然科学基金项目(编号: U2067202; 41772068; 41562006);国家重点基础研究发展规划973计划“中国北方砂岩型铀矿流体成矿过程研究”(编号: 2015CB453002) |
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| Discussion of the Genetic Relationship between Pyrite and Uranium Mineralization in Sandstone-type Uranium Deposits in Kailu Basin |
| Kailu Basin is located in the southwest of Songliao Basin, which is the key area of sandstone type uranium exploration in northern China. Since the discovery of Qianjiadian uranium deposit, some uranium deposits with industrial value have been found in the target strata of Upper Cretaceous Yaojia formation in the basin.In order to find out the genesis and formation mechanism of pyrite in this layer, and to explore the relationship between pyrite and uranium mineralization, the mineralogical characteristics of pyrite, uranium minerals in sandstone of ore bearing layer, and S isotope of pyrite are studied in detail.The results show that: (1) Uranium in the sandstones of Yaojia formation in Kailu Basin mainly exists in the form of independent uranium minerals and adsorbed uranium. The independent uranium minerals are mainly pitchblende, containing a small amount of brannerite and some coffinite, most of which grow along the periphery of pyrite. The adsorbed uranium is closely related to clay minerals. (2) Pyrite in sandstones of Yaojia formation mainly occurs in framboid, colloidal and granular forms, and most of them are associated with pitchblende. The S isotope of pyrite (d34S= –55.6‰~ 23.2‰), with an average value of –20.87‰, varies widely, indicating a high degree of sulfur fractionation and a wide range of sulfur sources. (3) The analysis shows that pyrite has two genesis: bacterial sulfate reduction and thermochemical sulfate reduction, and the formation mechanism of pyrite in these two genesis is discussed.Based on previous studies and combined with the metallogenic geological background of the study area, it is considered that pyrite provides the reducing agent for uranium mineralization, and the formation of pyrite and uranium minerals is closely related to the thermal fluid in the area. |
| CHEN Meng-ya,NIE Feng-jun,Mostafa FAYEK.2021.Discussion of the Genetic Relationship between Pyrite and Uranium Mineralization in Sandstone-type Uranium Deposits in Kailu Basin[J].Acta Geoscientica Sinica,42(6):868-880. |
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