粤北长江铀矿区铀分量化探与深部找矿潜力

粤北长江铀矿区位于诸广山复式岩体南缘,是我国重要的铀矿资源基地之一。区内断裂构造发育,岩浆活动频繁,拥有良好的铀成矿地质条件,现已发现铀矿床10余个,大多为浅成低温热液型矿床,深部探矿成果较少。结合相关地质工作成果,在分析矿区地质特征的基础上,首先采用U分量化探技术对矿区深部隐伏矿体进行探测,以剖面的形式采集土壤样品,进行相关测试分析,并对测试结果进行适当处理与图形绘制;然后结合深源铀成矿理论和矿区地质特征对区内的U分量含量总体特征和U分量异常特征进行分析解译,并对区内深部铀成矿条件进行讨论。研究表明:1矿区U分量含量总体较高,与区内有利的铀成矿地质条件相符合,U分量异常明显且与深部铀矿体位置吻合较好,U分量异常基本能够指示区内深部铀矿体的存在;2W、Mo分量异常明显且与U分量异常带吻合较好,U、W、Mo分量异常组合基本可作为该区指示深部铀矿的地球化学标志;3对于U分量异常明显且浓集较强的成矿有利地段,可视实际情况布置相应的钻探工程;4对于异常极强的单点异常和U分量异常不明显但伴生W、Mo分量异常强烈的地段,建议布置槽探等相关揭露工程,查明异常原因及其延伸规模。上述分析表明,粤北长江铀矿区深部找矿潜力较大,分析结果对于该区进一步开展深部铀矿找矿工作有一定的参考价值。

U Partial Content Geochemical Exploration and Deep Prospecting Potential of Changjiang Uranium Mining Area in Northern Guangdong Province

Changjiang uranium mining area in northern Guangdong province is located southern margin of Zhuguangshan complex massif,it is one of the important uranium resources bases in China. The fault structure is developed and magmatic ac-tivity is frequent in the area,which provide the favorable conditions of deep uranium mineralization. At present,more than ten uranium deposits are found in the area,most of them are belongs to the hypabyssal hydrothermal type deposits in low tempera-ture,the deep prospecting results in the area is less. The U partial content geochemical exploration method is a kind of deep penetration geochemistry method for the prospecting of deep concealed deposits,the method is based on earth gas and partial extraction technique. The deep uranium mineralization information can be obtained effectively by using the enrichment of urani-um anomalies in soil and the dynamic superposition component anomalies. Based on some related geological working results in the area,the geological characteristics of the area is analyzed,firstly,the partial content geochemical exploration method is a-dopted to conduct the prospecting work of deep uranium deposit,the soil samples are collected and tested,the tested results are processed and some profiles are drawn;then,based on deep source uranium metallogenic theory and geological characteristics of mining area,the overall distribution characteristics and anomaly characteristics of uranium partial content are discussed and in-terpreted,besides that,the deep uranium metallogenic conditions are analyzed. The study results show that:①the U partial con-tent is high,which is consistent with the favorable uranium metallogenic geological conditions in the area,the U partial content anomalies are significant and it is consistent with the position of deep uranium ore-bodies,the existing of deep uranium ore-bodies can be reflected effectively by the U partial content anomalies;②the anomalies of W and Mo are significant,and they are consistent with the U partial content anomaly belts,the partial content anomaly combination of U,W and Mo can be taken as the deep prospecting indicators of uranium deposits;③according to the actual situation of the area,the some related drilling engineering can be arranged where the U partial content anomalies are significant and the concentration of U partial content a-nomalies is strong;④some uncovering engineering ( just like trenching engineering) can be arranged in the area that the single anomaly point is strong and the U partial content anomalies are not significant but the associated elements ( W and Mo) anom-alies are strong so as to identify the anomaly causes and its extension scale. The above analysis results show that prospecting potential of the area is large,it can provide some reference for the further deep prospecting work of uranium deposit in the area.