| 鄂尔多斯盆地砂岩型铀矿成矿地质条件和关键控矿要素分析 |
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| 关键词:sandstone-type uranium deposit uranium source conditions ore controlling structure key ore controlling factors Ordos Basin |
| 基金项目:国家自然科学基金委重点支持项目(编号: 92162212);中国地质调查局地质调查项目(编号: DD20230045;DD20221678-05) |
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| Analysis of Metallogenic Condition and Key Ore-controlling Factor of Sandstone-hosted Uranium Deposits in the Ordos Basin |
| The Ordos Basin is an important uranium-bearing basin in the north of China. It has superior metallogenic geological conditions and prospecting potential. Based on the summary of investigation and research results of sandstone-type uranium deposits in the basin, we systematically analyzed the geological conditions of uranium mineralization. Moreover, herein we discuss the key ore control factors and prospecting potential. The results showed that the outer source area of the Ordos Basin is rich in uranium, and the high thorium/uranium ratio and uranium migration of the northern orogenic belt geological body indicated that it provides the greatest contribution rate to the uranium source in the basin. The micro uplift structure developed in the slope zone of the margin controls of the basin, the spatial positioning of the uranium deposits, and the fault structure control and reform uranium mineralization in the western and southwestern margins of the basin. The paleoclimate and sedimentary environment indicated that, from the southeast to the northwest region of the basin, the uranium-bearing horizon gradually evolved from a lower sub member of the lower Zhiluo Formation to an upper sub member of the lower Zhiluo Formation, showing evident migration regularity. The development characteristics of the coal line and carbonaceous mudstone in the lower part of the Zhiluo Formation restricted the spatial distribution of the uranium deposits. Uranium ore bodies primarily developed at the edge of the braided river main channel and the braided river delta distributary channel, with preferential enrichment in areas rich in organic matter and with strong heterogeneity and variable lithology. On this basis, six key ore control factors and related prospecting discrimination indices were established. The prospecting potential of sandstone-type uranium deposits was analyzed for five uranium ore (mineralization) concentration areas in the basin, and the next prospecting orientation was proposed. |
| YU Reng-an,JIN Ruo-shi,LI Tong,YANG Tong-xu,ZHU Qiang,TANG Yong-xiang.2023.Analysis of Metallogenic Condition and Key Ore-controlling Factor of Sandstone-hosted Uranium Deposits in the Ordos Basin[J].Acta Geoscientica Sinica,44(4):689-706. |
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