鄂尔多斯盆地与四川盆地砂岩型铀矿成矿条件对比初探

Comparison of Metallogenic Conditions for Sandstone-type Uranium Deposits between Ordos Basin and Sichuan Basin

为了研究砂岩型铀矿成矿条件,使其勘探工作能进一步拓展,通过总结北方鄂尔多斯盆地和南方四川盆地的主要控矿因素,较系统地对比了二者砂岩型铀矿铀成矿条件。研究表明,二者在盆地类型、规模及展布特征、铀源、盆地演化史和矿床成因类型等方面具有相似性,但在构造活动性、控矿沉积体系和古气候演化三大方面存在明显差异。四川盆地具备良好的铀成矿条件,成矿潜力巨大,是实现我国南方陆相盆地砂岩型铀矿找矿突破的重要基地,也为后期围绕差异性控矿因素详细开展成矿理论和成矿规律研究提供参考方向。

In order to study the mineralization conditions of sandstone type uranium deposits and further expand their exploration work,the uranium metallogenic conditions of the two sandstone-type uranium deposits are compared systematically by summarizing the main ore-controlling factors of the northern Ordos basin and the southern Sichuan basin.It is pointed out that they have similarities in basin type,scale and distribution characteristics,uranium source,basin evolution history and genetic type of deposit,but there are obvious differences in tectonic activity,ore-controlling sedimentary system and paleoclimate evolution.Through systematic comparative analysis,it can be seen that the Sichuan basin has good uranium metallogenic conditions and great metallogenic potential.It is an important base to achieve the breakthrough of sandstone-type uranium prospecting in the continental basin in southern China,and also provides a reference direction for the further research on metallogenic theory and law concerning on the different ore-controlling factors in the future.