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砂岩型铀矿床是一种具有重要经济价值的铀矿类型,受到世界各国地质勘探部门的高度关注。鄂尔多斯盆地是一个铀、煤、油、天然气共存的沉积盆地。本文在前人研究基础上,运用沉积体系理论,对鄂尔多斯盆地北部地区直罗组的沉积相及沉积体系归属进行系统分析,分析出该区直罗组的河流沉积经历了辫状河沉积、低弯度曲流河沉积和高弯度曲流河沉积3个演化阶段。同时,我们应用电子探针等观察到铀矿物等微粒的主要分布形式,并且发现该铀矿属于与天然气还原有关的低温热液型铀矿床。
Sandstone-type uranium deposits are a type of uranium deposit with important economic value and are highly concerned by the geological exploration departments of all countries in the world. The Ordos Basin is a sedimentary basin where uranium, coal, oil and natural gas co-exist. Based on the previous studies, this paper systematically analyzes the sedimentary facies and sedimentary system of Zhiluo Formation in the northern part of Ordos Basin based on the sedimentary system theory. It is concluded that the river sediments of Zhiluo Formation in this area experienced the deposition of braided river and low Three stages of evolution of curved meandering river sediments and high crooked meandering river sediments. At the same time, we observed the main distribution of uranium minerals and other microparticles by using electron probe, and found that the uranium deposit belonged to low temperature hydrothermal uranium deposits related to the reduction of natural gas.