| 砂岩铀矿体定位条件的铀、钍含量及其放射性同位素研究 |
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| 关键词:sandstone type uranium deposits delineation of ore body radioisotope |
| 基金项目:核工业科学基金资助项目“确定层间氧化带尖灭地段的水文地球化学方法研究”(编号:Y7196R1801) |
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| The Delineation of Ore Bodies in Sandstone Type Uranium Deposits by U and Th Concentrations and Their Radioisotopes |
| Exemplified by No. 512 uranium deposit, this paper discusses the delineation of ore bodies in sandstone type uranium deposits by uranium and thorium concentrations and their radioisotopes. The following conclusions have been reached: ① the contents of thorium in the whole redox zone remain stable, indicating that thorium is not chemically active in rocks, ② the contents of uranium increase gradually from the oxidation zone to the mineralization zone, but decrease gradually from the mineralization zone to the reduction zone, suggesting that uranium is transported in an oxidation environment and precipitates in a reduction environment, ③ the delineation of ore bodies in sandstone type uranium deposits can be made by uranium concentration exceeding 100 μg/g, and ④ the conditions for delineation of ore bodies in sandstone type uranium deposits by radioisotopes are different in different ore-forming periods. The conditions were 1≤ 234U/ 238U≤2, 0≤ 230Th/ 238U≤0.2,and 234U/ 230Th>1 during the last ore-forming stage, but were 0.75≤ 234U/ 238U≤1, and 0.5≤ 230Th/ 238U≤1 during the early ore-forming stage. |
| GAO Bai,SUN Zhan-xue,WANG Guang-cai,ZHANG Wen,LIU Jin-hui,WU Wen-zhen.2006.The Delineation of Ore Bodies in Sandstone Type Uranium Deposits by U and Th Concentrations and Their Radioisotopes[J].Acta Geoscientica Sinica,27(6):590-594. |
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