鄂尔多斯盆地北东部纳岭沟铀矿床成矿作用特征及成矿模式  

Geologic Characteristics and Metallogenic Model of Nalinggou Uranium Deposit in Northeastern Ordos Basin

作　　者：郭虎科 焦养泉[2] 苗爱生[1] 王贵[1,2] 王小龙[1] 程铁红 

机构地区：[1]核工业208大队,内蒙古包头014010 [2]中国地质大学(武汉),湖北武汉430074

出　　处：《铀矿地质》2015年第A01期283-292,共10页Uranium Geology

摘　　要：通过对纳岭沟铀矿床地质特征、成矿作用地球化学特征的研究，认为纳岭沟铀矿床为典型的古层间氧化带砂岩型铀矿床。该矿床定位的构造条件是受新构造运动影响而形成的泊江海子断裂及其派生断裂的直接控制；铀成矿作用主要表现为古层间氧化带蚀变作用。从古氧化作用早期的酸性蚀变、古氧化期后的弱碱性蚀变到晚期还原弱碱性蚀变，整个演变过程直接控制了纳岭沟铀矿床铀的后生改造、富集成矿。赋矿岩石的还原性组分特征和其它砂岩型铀矿床一样，主要是含有机碳、黄铁矿、硫（S2）等，铀的富集与其有着密切的关系。成矿作用历经了沉积铀预富集、古层间氧化作用成矿、后期层间氧化作用改造成矿和晚期弱碱性还原作用保矿等4个阶段。矿床形成年龄为84±1Ma、61.7±1.8Ma 和38.1±3.9Ma。文章在总结矿床地质特征、成矿作用地球化学特征的基础上，建立了纳岭沟铀矿床的成矿模式。According to the research of geology features and mineralization geochemistry in Nalinggou uranium deposit,it was indicated that the deposit is typical sandstone with paleo interlayer oxidization zones.The deposit was directly controlled by Bojianghaizi fault and the derived fractures which are affected by the new tectonic movement.Mineralization related alteration mainly represented by the paleo in-terlayer oxidization zones which range from acid related alteration of early paleo oxidation,slightly al-kaline alteration of later paleo oxidation to reduction of slightly alkaline alteration in the late stage.The evolution of alteration directly controls the epigenetic alteration mineralization of Nalinggou uranium de-posits.The features of reducing component in rich ore are the same as other sandstone uranium deposits, which mainly includes organic carbon, pyrite, sulfur and is closely related with uranium enrichment.Mineralization experienced four stages：pre enrichment deposition,mineralization with paleo in-terlayer oxidization,mineralization of interlayer oxidation transformation in late stage,and slightly al-kaline and reduction for ore bearing in later period.The metallogenic age of deposits were 84 ± 1 Ma, 61.7±1.8 Ma and 38.1 ±3.9 Ma.Based on the summary of metallogenic features for geological and geo-chemical mineralization,this paper established the metallogenic model of Nalinggou uranium deposit, and systematically divided the mineralization stages for location of different uranium deposits in Dongsh-eng region.

关 键 词：鄂尔多斯盆地 纳岭沟铀矿床 成矿地质特征 成矿模式 

分 类 号：P612[天文地球—矿床学]