航空能谱测量数据在砂岩型铀矿找矿预测中的应用

以澳大利亚弗罗姆湖地区砂岩型铀矿为例,利用航空能谱测量铀、钍、钾元素之间的地球化学特征差异,建立并计算古铀量、活性铀、地球化学活动性指数等特征参数,综合研究区盆地构造、古河道展布及地层岩性等特征,识别研究区的铀源区、铀元素迁入区、氧化-还原地球化学障等成矿预测要素,在ARCGIS 10平台上融合这些要素,最后圈定出研究区砂岩型铀矿找矿的有利远景区.研究表明航空能谱测量可以作为一种预测砂岩型铀矿有利远景区的有效方法.

Application of airborne radioactive spectrum measurement data on the ore-prospecting of sandstone-type uranium deposits

Taking the ore-prospecting of sandstone-type uranium deposits in the Frome Lake region of Australia as an example, using the differences of geochemical features of U, Th, K elements obtained by airborne radioactive spectrum measurement, the ancient uranium contents, activated uranium, contents, geochemical activity indexes and other airborne radiometric survey parameters, are established and calcu lated. Basing on the comprehensive study on the structure of the basin, distribution and other geological features of studied area,of paleochannels, lithologic the sources of uranium, uranium immigration areas, redox geochemical barriers and other metallogenic prediction factors are identified, finally basing on synthesizing the factors on ARCGIS 10, the prospective areas of sandstone type uranium deposits in studied area are delineated. The present study indicates that the airborne radioactive spectrum measurement may be an effective method in the prediction of favourable area of sandstone-type uranium deposits.