| 石连成.二连盆地哈达图铀矿床综合物化探特征及研究意义[J].地质与勘探,2022,58(2):274-285 |
| 二连盆地哈达图铀矿床综合物化探特征及研究意义 |
| Comprehensive geophysical and geochemical characteristics and research significance of Hadatu uranium deposit in Erlian Basin |
| 投稿时间：2021-02-23 修订日期：2021-10-20 |
| DOI：10.12134/j.dzykt.2022.02.003 |
| 中文关键词: 综合物化探特征 地电化学 找矿意义 哈达图铀矿床 二连盆地 |
| 英文关键词: comprehensive geophysical and geochemical characteristics, geoelectrochemical, prospecting significance, Hadatu uranium deposit, Erlian Basin |
| 基金项目:国家自然科学基金资助项目（编号：U2067204）和核工业航测遥感中心自主科研项目（编号：202003）联合资助 |
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| 中文摘要: |
| 二连盆地哈达图铀矿床是我国大型可地浸砂岩型铀矿床,矿体埋深大、品位富,研究其地电化学等综合物化探特征,可为建立覆盖区航放异常有效查证技术方法提供依据。基于矿床地质及航磁航放特征的分析,开展组合物化探方法测量及特征分析。研究表明：哈达图铀矿床位于受断裂构造控制的北东向、北北东向中等磁场区及中等-弱磁场的梯度带；航空及地面伽马能谱U含量垂直于矿体走向“两边高中间低”,且矿区及矿体的航空伽马能谱U含量的熵值相对较大；矿体上方的地电化学铀异常主要为深部铀矿体的纳微米级铀矿物垂向迁移至近地表被土壤中粘土矿物吸附所引起；埋深大于300m的铀矿体仍具有地电化学U高Mo低的平面特征,在剖面上U含量呈锯齿状尖峰异常；矿体对应于土壤氡浓度低值区。地电化学、地面伽马能谱、土壤氡浓度的组合测量技术能够有效查明覆盖区航放弱信息的成因及其与深部铀矿体的空间关系,可为隐伏砂岩型铀矿找矿有利地段的圈定提供依据。 |
| 英文摘要: |
| Hadatu uranium deposit in Erlian Basin is a large-scale in-situ leachable sandstone-type uranium deposit in China. Its ore body is buried depth and rich in grade. Studying the characteristics of its comprehensive geophysical and geochemical exploration is of great significance to the establishment of an effective technical method for the verification of airborne anomalies in the coverage area and to improve the exploration effect of hidden uranium deposits. Based on the analysis of the geological, aeromagnetic and airborne radiometric features of the deposit, the combined geophysical and geochemical survey and analysis are carried out. The research shows that Hadatu uranium deposit is located in the medium magnetic field and medium-weak magnetic field gradient zone controlled by the fault structure.The U content of aerial and ground gamma energy spectrum is high on both sides and low in the middle, which is vertical to the strike of the ore body.The airborne gamma spectrum uranium content above the deposit has a higher entropy. The geoelectrochemical uranium anomaly above ore body is mainly caused by the vertical migration of nano-micron uranium mineral from deep uranium ore body to the near surface and adsorption of clay minerals in the soil. The geoelectrochemical uranium of the deposit has a saw-tooth spike anomaly on the profile, and the plane is characterized by high uranium and low molybdenum. In addition, uranium ore bodies with a buried depth of more than 300m still have geoelectrochemical anomalies.The soil radon concentration above orebody is relatively low. The combined measurement technology of geoelectrochemistry, ground gamma spectroscopy and soil radon concentration can effectively identify the cause of weak airborne information in the coverage area and its spatial relationship with deep uranium ore bodies.The comprehensive method can provide a basis for the delineation of favorable areas for concealed sandstone-type uranium deposits. |
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