【作者】 鲁超； 彭云彪； 陈法正； 焦养泉； 杨建新；

【Author】 LU Chao~(1,2),PENG Yun-biao~1,CHEN Fa-zheng~1,Jiao Yang-quan~2,Yang Jian-xin~1 (1.Geological Team No.208,CNNC,Baotou,Inner Mongolia 014010,China;2.China University of Geoscience,Wuhan 430074,China)

【机构】 核工业208大队； 中国地质大学资源学院；

【摘要】 大量资料表明,二连断陷盆地在早白垩赛汉组沉积之后,既有整体抬升剥蚀,又发生主干断裂的正反转,早白垩地层遭受强烈改造,是剥蚀残留盆地。晚白垩世到古新世强烈反转受控于区域左旋走滑挤压应力背景,这一长时间的沉积间断不仅仅表现为二级层序边界和晚白垩沉积缺失,在巴彦乌拉地区更重要的是赛汉组遭受了强烈剥蚀,在残留赛汉组中发育潜水-层间氧化带并发育铀矿化。巴彦乌拉地区反转断裂对铀矿化的主要贡献在于其使断裂一侧形成构造斜坡,且大规模的赛汉组上段砂体暴露地表遭受剥蚀,形成完整的铀成矿系统和铀矿化。由于构造反转抬升的差异性,西部和南部由于强烈的剥蚀作用表现为潜水氧化带底板成矿,东部抬升稍弱主要变现为层间氧化特征。更多还原

【Abstract】 As being shown in many studies,Erlian fault basin Occurs both whole uplift-erosion and positive inversion of main fault,and it’s Early Cretaceous formation suffer strongly modified,which is denuded and residual basin.Strong inversion of Late Cretaceous to paleocene is controlled by regional sinistral strike-slip stress background.Long hiatus not only express as secondary sequence boundary,but also more important in Bayanwula area is that Saihan formation is strongly denuded,while phreatic-interlayer oxidation zone residual and uranium mineralization develop in Saihan formation.The Contribution of Reversed fault in Bayanwula area to uranium mineralization is that Structure slope is formed on one side of the fault and integral uranium mineralization system and uranium mineralization are formed.As the uplift of tectonic inversion differences,Western and southern study area expressed as phreatic oxidation and orebody is formed in bottom plate because of strong denudation,while eastern study area expressed as interlayer oxidation feature because of weaker uplift.更多还原