二连盆地可地浸砂岩型铀成矿的再认识

笔者从铀成矿条件入手 ,分析了二连盆地在基底演化期、含矿建造形成期以及后生改造成矿期各阶段对可地浸砂岩型铀矿的控制作用 ,认为二连盆地在含矿建造形成期是由众多分割性强的 ,构造演化和沉积变迁自成体系 ,并具有多物源、近物源特点的小凹陷所组成。同时 ,综合其他控制砂岩型铀矿的因素 ,确定了二连盆地是以发育潜水 层间氧化带砂岩型铀矿为其主要成矿类型 ,且矿床规模以中、小型为主 ,具有成群成带产出的特点。

New understanding of ore-formation of in-situ leachable sandstone-type uranium deposit in Erlian basin

Starting with the ore?controlling role of tectonic evolution of Erlian basin,i e the basement evolution stage,the formation stage of ore?hosting formation,and the ore?formation stage of epigenetic reworking,authors come to a conclusion,that Erlian basin was a sedimentary basin composed of tens of little separate depressions with their own tectonic and sedimentary evolutionary features,and multiple and near source area at the stage of the ore?hosting formation Combining above?mentioned factors with the other ore?controlling factors related to sandstone?type uranium deposits,authors suggest that the size of sandstone?type uranium deposits to be found in Erlian basin might be mostly small or medium in size But it is possible that the smaller medium?sized uranium deposits would occur in groups The dominant subtype of the sandstone?type uranium deposits may be phreatic?interlayered oxidized zone.