新疆伊犁盆地南缘砂岩型铀成矿潜力综合评价

Integrated evaluation of sandstone-hosted uranium metallogenic potential in the southern margin of Yili basin, Xinjiang, China

中国矿产资源勘查已经积累了大量地质资料,在新的成矿理论指导下,如何使这些资料在新一轮铀资源勘查中发挥最大效能是一项重要的课题。提出了砂岩型铀矿综合找矿模型的构建流程;在研究伊犁盆地南缘512典型铀矿床的地质、水文地质和区域地球物理场特征的基础上,建立了512铀矿床的多源信息描述模型,从中归纳总结出512式砂岩型铀矿田和铀矿床的综合找矿模型;依据综合找矿模型,完成了研究区砂岩型铀成矿信息的提取。最后,应用证据权重法综合中比例尺多源成矿信息完成了伊犁盆地南缘砂岩型铀成矿潜力综合定量评价,取得了较好的预测效果。

Plenty of geological data have been accumulated during mineral resource survey in China; under the guidance of new metallogenic theories, it is an important task how to use these data and bring into the best effect in the new cycle of uranium survey. The flow sheet of establishing the integrated mineral deposits prospecting model for sandstone-hosted uranium deposits is put forward in the paper. Based on the study of geology, hydrogeology and regional geophysical field characteristics of representative uranium deposit No. 512 in the southern Yili basin,its multi-source information descriptive model is established, from which 512-type integrated prospecting model of sandstone-hosted uranium orefield and deposit are summarized. According to the established integrated prospecting models, the metallogenic information extraction of sandstone-hosted uranium deposits is completed in the study area. Finally, the integrated quantitative evaluation of sandstone-hosted uranium metallogenic potential is performed by using the evidence weighting method to integrate middle scale multi-source metallogenic information in the southern Yili basin,and the good prediction effect is obtained.