镇原地区下白垩统成岩作用与铀成矿前景预测

以铀成矿前景预测为目的，笔者采用野外研究和室内分析相结合的方法，对鄂尔多斯盆地镇原地区下白垩统砂岩的岩石学特征、成岩作用演化和铀成矿条件进行了分析研究，认为本区下白垩统砂岩岩石成熟度中等，成岩作用强度较弱，成岩演化经历的同生成岩、早成岩和表生成岩3个阶段均与铀矿化有关。铀成矿条件分析表明，本区下白垩统浅层不利因素多。铀异常的发现和氧化一还原过渡带的展布特征指示铀矿勘探应向深部转移。

Diagenesis of Lower Cretaceous system and forecasting on uranium mineralization in Zhenyuan area

Aimed at forecasting uranium mineralization prospect, research on lithological features, diagenetic succession and surroundings of uranium mineralization were conducted by using combinative method of field exploration and indoor analysis. It was founded that maturity of sandstone in the Lower Cretaceous system in Zhenyuan area is intermediate and intensity of diagenesis is relatively light. There lies intimate relationship between uranium mineralization and the three diagenetic stages of syngenesis, early diagenesis and epidiagenesis. Analysis of uranium mineralization condition showed that there are some disadvantages in shallower strata of Lower Cretaceous system in Zhenyuan area. Discovery of uranium anomaly and approach of transitional zone of oxidation-reduction implied that exploration of uranium should be transferred to deeper strata.