鄂尔多斯盆地东胜地区沉积体系与砂岩型铀成矿

沉积体系分析在可地浸砂岩型铀矿床的研究中起着非常重要的作用.本文以沉积体系分析和层序地层学为依据,对鄂尔多斯盆地东胜地区中侏罗统直罗组沉积体系特征、沉积相的空间展布、沉积环境的演化和层序地层学等方面进行了研究,认为：（1）沉积相的平面分布控制着砂体的空间展布,进而影响着赋铀砂体的空间分布;（2）沉积相和沉积环境的演化创造了良好的岩相及岩性组合条件,有利于层间氧化作用的进行;（3）沉积层序控制了3层结构的岩性空间组合.

The relationship between depositional system and ore-formation of sandstone-type uranium deposits in Dongsheng area, Ordos basin

The analysis on depositional system plays a very important role in studying sandstone-type uranium deposits.Based on depositional system analysis and sequence stratigraphy,and through the study of depositional system characteristics and the spatial distribution of sedimentary facies,the evolution of sedimentary environments as well as the sequence stratigraphy of Zhiluo Formation in Dongsheng area,Ordos basin,authors have come to the following conclusions,(1)the spatial distribution of sand bodies is controlled by the planar distribution of sedimentary facies,which,in turn,affects the spatial distribution of ore-hosting sand bodies;(2)the evolution of sedimentary facies and sedimentary environments creates good lithofacies and lithological conditions favorable for interlayer oxidation;(3)the spatial lithologic combination of"three layer structure" is controlled by sedimentary sequence.