| 黄笑,蔡建芳,钟佳霖,余弘龙,唐国龙,何明勇,张政.松辽盆地大林地区砂岩型铀矿铀镭平衡系数特征及其地质意义[J].矿产勘查,2026,17(4):625-634 |
| 松辽盆地大林地区砂岩型铀矿铀镭平衡系数特征及其地质意义 |
| Characteristics and geological significance of uranium-radium equilibrium coefficient of sandstone-type uranium deposits in Dalin Area of Songliao Basin |
| 投稿时间：2024-08-21 |
| DOI：10.20008/j.kckc.202604005 |
| 中文关键词: 砂岩型铀矿 铀镭平衡系数 松辽盆地 大林地区 同位素活度 |
| 英文关键词: sandstone-type uranium deposits uranium-radium equilibrium coefficient Songliao Basin Dalin Area isotope activity |
| 基金项目:本文受中国核工业地质局项目“松辽盆地通辽—大庆地区铀矿资源调查评价与勘查”“中国北方砂岩型铀矿铀镭平衡特(202212)、征研究”(202512-6)、“基于物联网的放射性物探氡及其子体探测深部铀矿方法研究与应用”(202512-7)及“河北省张北—内蒙古突泉地区 |
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| 中文摘要: |
| 在砂岩型铀矿勘查中，铀镭平衡系数受地球化学环境的影响，通常可有效地反映出铀镭的迁移富集规律，且是 γ测井解释和矿床资源量估算准确的重要参数保障。本文以松辽盆地大林地区铀镭样品为研究对象，开展了矿化类和非矿化类岩石铀镭平衡系数研究。经统计铀镭平衡系数频谱曲线分布特征，分析铀镭平衡系数与样品铀含量、埋深、氧化带之间的关系。结果表明，矿化砂岩偏铀，矿化泥岩几乎处于平衡状态，非矿化泥岩和非矿化砂岩偏镭，表明铀成矿作用仍然在持续发生，非矿化岩石是铀成矿重要的铀源之一。样品铀镭平衡系数与铀含量呈负相关，与埋深呈正相关，平面上远离氧化带前锋线偏铀，靠近则偏镭。结合含矿层铀的同位素活度比值为 0.75～1.08，平均值为 0.92，可推测其位于氧化还原过渡带，是砂岩型铀矿铀元素富集的有利部位。 |
| 英文摘要: |
| In the exploration of sandstone-type uranium deposits, uranium-radium equilibrium coefficient is af.fected by the geochemical environment, which can effectively reflect the migration and enrichment rule of uranium ra.dium, and is an important parameter to ensure the accuracy of gamma logging interpretation and deposit resource esti.mation. Uranium-radium equilibrium coefficient in mineralized and non-mineralized rocks was studied by takinguranium-radium samples from Dalin Area of Songliao Basin as the research object. The relationship between uranium-radium equilibrium coefficient and the content of uranium, the buried depth and the oxidation zone of the sample wasanalyzed by analyzing the characteristics of the spectrum curve of uranium-radium equilibrium coefficient. The resultsshow that the mineralized sandstone is partial to uranium ,and the mineralized mudstone are almost in equilibrium, andthe non-mineralized mudstone and the non-mineralized sandstone are partial to radium, which indicates that the ura.nium mineralization is still continuing, and the non-mineralized rock is one of the important uranium sources for ura.nium mineralization. Uranium-radium equilibrium coefficient is negatively correlated with uranium content and posi.tively correlated with burial depth. On the plane, uranium-radium equilibrium coefficient away from the front of theoxidation zone is partial to uranium, or else partial to radium. The isotope activity ratio of uranium in the ore-bearinglayer ranges from 0.75 to 1.08, with an average value of 0.92. It can be inferred that the ore-bearing layer is located inthe redox transition zone and is a favorable location for uranium enrichment in sandstone-type uranium deposits. |
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