放射性测量方法在稀有稀土矿勘查中的应用——以小兴安岭地区南岔区某铀异常点为例

Application of radioactive prospecting in exploration of rare metal minerals:A case study of a uranium anomaly in the Nancha area

本文研究了黑龙江省小兴安岭地区稀有稀土元素赋存状态及放射性特征,提出了能谱测量在稀有稀土矿勘查中的一些新认识。通过航空放射性物探测量与地面伽马能谱测量相结合的方法,深度挖掘能谱测量数据的参数特征,确定找矿标志。研究认为,稀有金属矿床的矿化多与花岗岩伟晶岩有关,富集过程中常伴有钠长石、独居石、晶质铀等放射性矿物形成,且具有与铀矿的共伴生的特点,利用放射性测量可成为寻找REE、Nb、Ta等稀有金属矿床的便捷且有效的方法。文章在伊春南岔地区航放异常内新发现铌钽、铷多金属矿化点一处,证实了放射性勘查方法的有效性。

The mineralization of deposits of rare metals such as tantalum and niobium in China is mostly related to granite pegmatite.The enrichment of rare metals in these deposits is accompanied by the formation of radioactive minerals,such as albite,monazite,and high-grade uranium,and these deposits have paragenetic and associated minerals uranium deposits.Therefore,radioactive prospecting has become the most convenient and effective method to explore deposits of rare metals such as REEs,Nb,and Ta.Based on the close correlation between mineralization and radioactivity of rare earth minerals,this study fully investigated the parameter characteristics of the surveyed energy spectrum data through the combination of airborne radioactivity measurement and ground gamma spectrometry measurement to determine prospecting indicators.A new niobium-tantalum-rubidium polymetallic mineralized point was discovered in the Nancha area,Yichun City using the radioactive prospecting method,which was thus proven effective.