Study on the Characteristics and Genesis of Uranium Mineralization in Saierhaina Area in Yin'e Basin
The early surface uranium mineralization zone discovered in the Saierhaina area of Yin'e Basin was initially believed to be sandstone-type formed by groundwater or interlayer oxidation.This study revealed the ore host rocks are dolomitic phosphatic rock and phosphatic siltstone.The ores contain a large amount of microcrystalline apatite(francolite)which was identified as carbon-fluorine apatite by electron probe and laser ablation techniques and occured as microcrystalline aggregates(＜1μm)in form.Whole-rock major and trace element analysis showed a good positive correlation between uranium content and P,Ca content,while the in-situ analysis(LA-ICP-MS)of apatite indicated a positive correlation between uranium content and P,Ca,REE,and other elements.No uranium minerals were found through high-resolution scanning electron microscope,indicatting that uranium is incorporated into apatite in the form of solid solution.Lithology and lithofacies,in-situ trace element composition and rare earth element characteristics of apatite and genesis of associated minerals showed that the uranium-rich apatite was formed during the diagenesis process under the influence of microbial activity.Therefore,the uranium exploration in Saierhaina area should pay attention to the mineralization of both phreatic-interlayer oxidation and sedimentary diagenesis.
国家科技期刊平台
NSTL
万方数据
维普
