Anomaly characteristics of airborne gamma-ray spectrometric survey and uranium prospecting direction in Huayangchuan, Qinling
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摘要:
华阳川铀铌铅矿床是北秦岭造山带内一种类型特殊的铀多金属矿床。为了实现在外围快速找矿的目的，在矿床及其周边开展了1：1万高精度航空磁放测量，获得高精度的航空放射性数据，通过对航放数据的解释，对下一步找矿勘探工作的部署有重要意义。通过对宏观上放射性元素的分布特征的研究，认为铀、钾异常分布特征相似，在测区西部有大面积分布，东部无成规模异常，钍异常在测区中部形成东西向异常带，与韧性剪切带的位置一致。铀异常有明显受北西向和北东向两组断裂控制，且在华阳川断裂北东盘异常面积大，强度高，但南西盘太古宙地层却无明显铀异常。本次研究计算了钍钾比、钍铀比、铀钾比、古铀含量、活性铀含量等参数，掌握了元素在不同地层单元的迁移富集规律。根据航空放射性异常，开展地面验证工作，圈定3条铀矿化带，达到了快速找矿的目的，对铀矿等战略性矿产的成矿规律研究及找矿勘查有积极意义。
Abstract:The Huayangchuan uranium-niobium-lead ore deposit is a unique type of uranium polymetallic deposit in North Qinling orogenic belt. For the purpose of rapid mineral exploration, 1:10000 airborne magnetic and gamma-ray spectrometric measurement was conducted in the peripheral area to obtain high-precision airborne radioactive data. The explanation of these data is of great significance to the deployment of future exploration work. The distribution of radioactive elements shows that potassium and uranium anomalies are similarly located in the western part of the survey area, but there are no anomalies in the east. Thorium anomalies have formed an EW-trending anomaly belt at the center of the survey area, which is consistent with the ductile shear zone. The uranium anomalies are controlled by NW-and NE-trending faults. They are obviously distributed in the northeast plate with large area and high anomaly intensity, but there are no anomalies in Archean metamorphic rocks of southwest plate. The ratios of Th/K, Th/U and U/K, original U and active U were calculated in this study to understand the migration and enrichment of radioactive elements in different strata. According to the airborne gamma-ray spectrometry anomalies, ground verification work delineated three uranium mineralization zones, thus achieving the purpose of rapid mineral exploration. The result obtained by the authors can play a guiding role in the study of ore-forming process and the prospecting for uranium minerals and other strategic minerals.
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表 3 测区铀矿成矿有利地层、岩体放射性参数统计
Table 3. Statistics of favorable strata and intrusive rocks for uranium mineralization
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