| 鄂尔多斯盆地塔然高勒地区直罗组上、下段的
岩性-岩相特征及对铀成矿的差异性控制作用 |
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| 关键词:lithological characteristics sedimentary environment sandstone type uranium differential control of uranium mineralization Upper Member of Zhiluo Formation Lower Member of Zhiluo Formation Tarangaole area |
| 基金项目:国家重点基础研究发展计划(973计划)(编号: 2015CB453000);中国地质调查局地质调查项目(编号: DD20160127) |
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| Lithologic-lithographic Characteristics of the Upper and Lower Members of the Zhiluo Formation and Their Differential Control of Uranium Mineralization in the Tarangaole Area, Ordos Basin |
| In order to find out the lithologic-lithographic characteristics and the differences in fluid strengths involved in the alteration of the Upper and Lower Members of the Zhiluo Formation in Tarangaole area, the authors used a series of methods and tests including core observation, section comparison, clay minerals, carbon and oxygen isotopes and U and Th elements analysis. The results show that the Upper Member of the Zhiluo Formation in the southern part of the study area is mainly composed of grayish green and red mudstones intercalated with lenticular red, yellow and grayish green sandstones, whereas that in the northern part is mainly composed of red mudstone and grayish green sandstone, and that both of the lower parts are composed of grayish white, grayish green sandstone or glutenite intercalated with thin layer of mudstone. The red sandstone is a primary sedimentary type and the grayish green sandstone is a type of post-regeneration. The interaction between oxygen-containing uranium water and reducing fluid is weaker in the Upper Member than in the Lower Member; besides, its degree of action is reduced from north to south, the northern restored altered rock coexists with primary rock, and the primary rock remains in the south. The Lower Member of the Zhiluo Formation is more fully modified by the fluid, and the main body is posterior altered rock. This distribution of different types of sand bodies in the Zhiluo Formation is affected by both sedimentary facies and diagenesis, but the difference between the degrees is obvious, which limits the positioning of uranium mineralization enriched in the Lower Member of the Zhiluo Formation. Therefore, the Upper and Lower Members should be regarded as different metallogenic systems. |
| ZHU Qiang,LI Jian-guo,YU Reng-an,SIMA Xian-zhang,WEN Si-bo,LI Guang-yao,SI Qing-hong.2019.Lithologic-lithographic Characteristics of the Upper and Lower Members of the Zhiluo Formation and Their Differential Control of Uranium Mineralization in the Tarangaole Area, Ordos Basin[J].Acta Geoscientica Sinica,40(3):456-468. |
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