| 巴音戈壁盆地塔木素铀矿床含矿砂岩成岩作用类型、演化序列及其对铀成矿的约束 |
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| 关键词:Tamusu sandstone-type uranium deposit diagenesis hydrothermal fluids metallogenic environment |
| 基金项目:国家自然科学基金项目(编号: 42062008; 41862010; 42072099; U2067202);国家重点研发计划项目(编号: 2015CB453002);江西省教育厅科学计划项目(编号: GJJ180363);东华理工大学放射性地质与勘探技术国防重点学科实验室开放基金项目(编号: RGET1612) |
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| Diagenesis Types and Evolution Sequence of Ore Bearing Sandstone and Their Constraints on Uranium Mineralization in Tamusu Uranium Deposit, Bayingobi Basin |
| Exploration and research show that some sandstone-type uranium deposits not only contain superoxide fluids, but also deep hydrothermal activity fluids. These sandstone-type uranium deposits have a wide variety of alteration types and a complex the genesis. In the Tamusu sandstone-type uranium deposit, the action of both supergene oxidation and deep hydrothermal activity fluids is obvious. The ore-bearing sandstone is generally consolidated due to hydrothermal transformation. Based on microscopic identification, Electron Probe Microanalysis,and Scanning Electron Microscope, this study systematically studied the diagenesis, characteristics of ore bearing sandstone, and the generation sequence of epigenetic altered minerals, in the Tamusu deposit, and assessed the evolution process of diagenetic and metallogenic events. The results suggest that the main reasons for the densification of the target layer are weak compaction, strong cementation, and widespread recrystallization. Hematite, limonitization, carbonation, and gypsum are the main cementation types in the area. The diagenetic evolution of the area can be divided into sedimentary early diagenetic, early oxidation fluid action, thermal fluid transformation, and late oxidation fluid weak transformation stages. Based on the study of the temporal and spatial variation of the metallogenic environment, it is believed that the key to uranium precipitation is the change in the redox transition site environment from a weak alkaline to an acidic environment during diagenesis. Large scale oxidation was the basis for the formation of the deposit, and the key to mineralization was the superimposition of the low-grade uranium ore formed in the early stage by the late thermal fluid activity. This study not only enriches the metallogenic theory of sandstone-type uranium deposits, but also guides the future exploration of this area. |
| ZHANG Cheng-yong,XIA Fei,YAN Zhao-bin,DENG Wei,NIE Feng-jun,ZHANG Peng-fei,WEN Zhen-yu,LIU Bo,DAI Ming-jian,FENG Zhi-bing.2021.Diagenesis Types and Evolution Sequence of Ore Bearing Sandstone and Their Constraints on Uranium Mineralization in Tamusu Uranium Deposit, Bayingobi Basin[J].Acta Geoscientica Sinica,42(6):907-920. |
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