钍归一化法在松辽盆地开鲁坳陷大林地区地面伽马能谱资料处理中的应用研究

在可地浸砂岩型铀矿勘查中,地面伽马能谱测量因地表覆盖层等的影响,有效信息往往被掩盖。为有效提取铀矿化信息,对在松辽盆地开鲁坳陷大林铀矿产区采集的地面伽马能谱数据开展钍归一化法处理。获得的铀剩差异常范围与区内铀矿体及断裂的空间展布相吻合。经分析表明,钍归一化法能够有效反映断裂的存在。该区断裂对铀成矿控制明显,区内铀剩差异常区为氧化还原过渡带,可为该区下一步找矿工作提供依据。

The application of thorium normalization to data processing of gamma ray spectrum in Dalin area,Kailu sub-basin,Songliao Basin

In exploration of the sandstone type uranium deposits,the effective information of gamma ray spectrum is often covered by surface information due to the influence of surface overburden and other factors.In order to extract information related to uranium mineralization,the authors carried out the application of thorium normalization by gamma ray spectrum in Dalin area.The residual anomaly of uranium extracted is in agreement with the distribution of the known uranium orebodies and faults.The analytical results show that the method of thorium normalization can exhibit the distribution of faults effectively.Within this area uranium mineralization is controlled by faults,the abnormal area of uranium residual is also the transition zone of oxidation-reduction,which provides the basis for the next exploration within this area.