甘肃省三道明水盆地砂岩型铀矿成矿潜力分析

METALLOGENIC POTENTIAL ANALYSIS OF THE SAND TYPE URANIUM DEPOSITS IN THE SANDAOMINGSHUI BASIN, GANSU PROVICNE

以煤田钻孔资料"二次开发"作为铀矿勘查新思路,在三道明水盆地共收集和筛查煤田钻孔15个,其中铀矿孔2个,放射性异常孔2个;对收集的煤田钻孔放射性测井成果开展了综合研究,简要分析了该盆地的砂岩型铀矿成矿地质条件和成矿潜力,确立了中侏罗世大山口群和下白垩统赤金堡组为铀找矿目的层;根据煤田孔中白垩系地层铀矿化类型,在该盆地划分出潜水氧化带和层间氧化带型两个砂岩型铀矿找矿靶区,为在该盆地开展砂岩型铀矿找矿工作指出了方向。

Using the new idea of employing the data of coalfield drilling for second-round development of uranium resources, the authors collected and screened 15 coalfield drilling, including two uranium holes and two radioactive anomalies holes. Based on the comprehensive study of coalfield drilling radioactive logging,metallogenic geological conditions and metallogenic potential of sandstone type uranium deposits in the basin, we have established the Middle Jurassic Dashankou group and Early Cretaceous Chijinbao as uranium prospecting.According to the type of uranium mineralization of the coalfield drilling in the Cretaceous strata, phreatic oxidation zone and interlayer oxidation zone type prospecting targets are divided in the basin, which point out the direction for the prospecting work of sandstone type uranium deposits.