鄂尔多斯盆地东胜铀矿成矿作用研究

对东胜铀矿提出了物源、地层、古气候等3种成矿因素。岩相学与成矿矿物学研究表明,铀矿石中含有大量的方解石,并且长石与高岭石含量呈正相关,铀矿化与有机质也有一定的联系。结合铀矿地质特征初步分析认为,东胜铀矿是在氧化带铀元素以碳酸铀酰络合物搬运,在酸性介质条件下,还原带长石碎屑蚀变为高岭石,并有钙离子析出。当碳酸铀酰络合物从氧化带迁移到还原带,遇有大量钙离子时发生分解,出现铀矿石与方解石同时沉淀现象,有机质的还原作用也是铀矿沉淀的主要因素,经漫长的地质作用富集成工业矿体。

Preliminary Study onMetallization of Dongsheng UOre in Ordos Basin

This paper puts forward five mineralization elements for U ore in Dongsheng area, including structuralelement, formation factor, lithologic element and paleoclimate factor. Reflectance of X-ray diffraction analysisshows the U ore includes lots of calcite, and has positive correlation between feldspar and kaolinite perform urani-um elements transported by complex uranyl carbonate(Na2[ UO2(CO3)3])in oxidation zone. When reductionzone in acidic medium, the fragments of feldspar alter into kaolinite, separating Ca ion. Complex uranyl carbonatetransport form oxidation zone to reduction zone, it will decomposition when meet many Ca ions, showing the pre-cipitation of uranium ore and calcite. The reduction function of organic substance play an important role in theprecipitation of U ore.