【摘要】 通过分析二连盆地晚中生代以来的沉积构造演化,划分出早白垩世的大陆伸展断陷、断拗转换和晚白垩世以来弱挤压差异升降3个演化阶段。根据砂岩型铀矿成矿机理,认为断拗转换阶段沉积的灰色碎屑岩系是重要的找矿目的层,差异升降运动为砂岩型铀矿成矿提供了必要条件;分析了盆地中不同地段可能产出的铀矿化类型,初步归纳了铀的成矿模式。更多还原

【Abstract】 Various mineral resources in a basin are associated with its tectono-sedimentary evolution.Based on the analysis of the tectono-sedimentary evolution of Erlian basin,three evolutional stages of Erlian basin are classified,they are:the continental extensional down-faulting stage,the transitional stage from down-faulting to down-warping in Early Cretaceous,and slightly compressioual differentiated uplifting-subsidence since Late Cretaceous.According to the mechanism of sandstone-hosted uranium metallogenesis it is suggested that the grey clastic rock series deposited at the stage of down-faulting down-warping transition must be the important target for uranium prospecting,and the differentiated uplifting-subsidence offers necessary conditions for sandstone-hosted uranium ore-formation.Then,types of uranium mineralization that could occur in Erlian basin are discussed,and uranium metallogenic model has been preliminarily summarized.更多还原