乌兰察布坳陷北西缘赛汉组下段氧化带发育特征与铀成矿关系

The Characteristics of Oxidation Zone and Its Relation to Uranium Mineralization in the Lower Member of Saihan Formation in the North Western Margin of Wulanchabu Depression

近些年,在乌兰察布坳陷北西缘地区赛汉组下段中发现了较好的铀矿化信息,铀矿化与氧化带的发育密切相关。文章以岩心、地质露头观测和岩石地球化学参数分析等手段,分析了研究区不同的岩石地球化学类型、氧化带的空间分布特征。根据该区不同的氧化带类型、空间展布及其与铀矿化之间的成因关系,划分了同沉积叠加后期改造泥岩型和潜水-层间氧化带砂岩型两种铀矿化类型,探讨并总结了研究区氧化带空间发育特征与铀矿化的分布规律,对今后在该区进行铀矿找矿提供重要的指导作用。

In the northwest margin of Wulanchabu depression, good uranium mineralization information has been found in the lower member of Saihan formation in recent years. The uranium mineralization is closely related to the development of oxidation zone. By means of core, outcrop observation and rock geochemical parameter analysis, the spatial distribution characteristics of different geochemical types and oxidation zones of rocks in the study area were analyzed. According to the different types and spatial distribution of oxidation zones and their genetic relationship with uranium mineralization, two types of uranium mineralization were divided: later reform superimposed syndeposition mudstone type and phreatic-interlayer oxidation zone sandstone type. The spatial development characteristics of oxidation zone and the distribution pattern of uranium mineralization were discussed and summarized, which can provide an important guid line for next uranium prospecting in this area.