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Characteristics of Altered Ilmenite in uranium-Bearing Sandstone and Its Relationship with uranium Minerals in the Northeastern Ordos Basin

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Journal of Earth Science 2022年第2期33卷 342-357页

作者： Lulu Chen Yin Chen Hu Guo Hualei Zhao Peisen Miao Jian-Guo Li Xiaoxi Feng Rengan Yu Chao Tang Tianjin Center China Geological SurveyTianjin 300170China State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China Key Laboratory of uranium Geology China Geological SurveyTianjin 300170China North China Center of Geoscience Innovationy Tianjin 300170 China Cores and Samples Center of Natural Resources Beijing 100192China

In recent years,the close relationship between uranium and Ti-Fe oxides in the sandstonetype uranium deposits has been extensively ***,the altered characteristics of ilmenite and its relationship with uranium enrichment still remain *** this paper based on heavymineral sorting of uranium ore selected from the Tarangaole-Nalinggou deposit in the northeastern Ordos Basin,electron probe,backscattering image,energy spectrum and scanning electron microscopy were systematically *** ilmenite in the sandstone can be divided into four groups,including unaltered,weakly altered,moderately altered,and strongly altered *** alteration of ilmenite in uranium ores is notably more intense than that of the surrounding *** addition,weakly,moderately,and strongly altered ilmenite associated with uranium minerals in uranium ores demonstrate that the more intensity ilmenite altered,the closer its relationship with uranium minerals *** ilmenite has likely been somewhat altered before mineralization,and the alteration intensifies by later exposure related to an oxygencontaining *** alteration mechanism comprises a process of competitive diffusion between Fe^(2+)and O_(2)-*** the early stage,Fe ions was mainly diffused on the particle ***,diffusion of O ions into the particles began to be *** of the leached iron is stripped or carried away by *** an alkaline and reductive environment,the remaining iron is reduced to form the surrounding pyrite,and TiO_(2)in a form of titanium sol recrystallizes(i.e.,anatase).Backscattering images show that uranium and altered ilmenite are close in *** is often distributed along the edges of altered ilmenite as burrs in *** or knitted coffinite associated with anatase is formed in the voids of altered *** chemical composition of altered ilmenite varies considerably from the core to edge,and the mineral assemblage sequence is from gird

关键词： Ordos Basin Tarangaole-Nalinggou uranium deposit altered ilmenite uranium occurrence enrichment of uranium ore deposit geology

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