【摘要】 钍铀比、古铀量是伽马能谱测量中反映铀成矿信息的重要参数,可指示区域铀迁移路径、划分迁入富集区域,进一步提取铀成矿信息,判断铀成矿的可能性。这里以伊春威岭地区放射性异常为例,计算地面伽马能谱测量数据参数,对比铀含量与古铀量信息,进行方法有效性实验。实验表明:该区域内铀的迁出与迁入、淋失与富集被约束在糜棱岩化带内,存在二次富集现象。实验结论与区域地质背景及岩石分析结果相符。综上所述,利用古铀量分析在放射性异常地区开展铀成矿预测,并取得较好成果,成功预测铀二次富集部位,其中部分异常已被槽探工程揭露验证,本次研究对该地区铀矿勘查中地面伽马能谱测量数据的利用具有重要意义。更多还原

【Abstract】 The ratio of thorium to uranium and paleo-uranium are important parameters to reflect uranium mineralization in gamma spectrum measurement, which can indicate the uranium migration path in the region, divide the migration into the enrichment area, further extract uranium mineralization information, and judge the possibility of uranium mineralization. In this paper, the Weiling radiocactive anomaly area is taken as an example to carry out a validity test of this method by calculating the data parameters of gamma-spectrometric measurement and compare the uranium content to paleo-uranium. The results show that the introduction or removal of uranium and leaching or enrichment are restricted in mylonitized area, and there is secondary enrichment. The experimental results are consistent with the regional geological background and analysis of rocks. Using this method of paleo-uranium for uranium metallogenic prognosis in the radioactive anomaly, and good results have been obtained that successfully predicte the secondary uranium concentration area. Some of them have been identified by trenching. This study is of great significance for uranium exploration in this area that the utilization of gamma spectrum measurement data.更多还原