沉积盆地不整合类型及其与砂岩型铀矿成矿的关系

Types of Unconformity in Sedimentary Basin and Its Relation to Sandstone Hosted Uranium Mineralization

笔者在论述沉积盆地不整合类型的基础上,结合砂岩型铀矿成矿作用的特点,重点分析了不整合在砂岩型铀矿不同成矿阶段所起的作用,总结了不整合与砂岩型铀矿成矿作用的时空关系,认为长时间、大规模的不整合为铀的活化及迁移提供了足够的时间和空间;良好泥-砂-泥地层结构之上的不整合为铀进入砂体提供了时间及通道条件;沉积盆地中的不整合是砂岩型铀矿找矿的重要线索,不整合之下的砂体是重要的找矿层位及部位,不整合发育持续的时间与铀矿化发育的时间具有很好的同时性。

This paper elaborated on the types of unconformity and the characteristic of sandstone type u- ranium mineralization, and analyzed the funetion of unconformity in the different progress of sandstone hosted uranium mineralization. It was believed that provide enough space and time for the mobilization fortuity over the sandstone provide the pathway and long time and widely distributed unconformity can and migration of uranium. The formation of uncon- time for the uranium to entry sandbody, the uncon- formity was an important clue to the exploration of sandstone type uranium deposit, sandbody below the unconformity is an important target, and the mineralization time was fairly concord to the forming period of unconformity.