鄂尔多斯盆地纳岭沟铀矿床矿（化）体岩石地球化学特征  

Petrogeochemical Characteristics of Nalinggou Uranium Deposit,Ordos Basin

作　　者：王贵[1,2] 苗爱生[1] 高贺伟 乔鹏[1] 易超[3] 李西得[3] 

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 [3]核工业北京地质研究院,北京100029

出　　处：《铀矿地质》2015年第A01期273-282,共10页Uranium Geology

基　　金：中国地质调查局整装勘查区综合研究项目（编号：12120114076501）和中国核工业地质局铀矿地质勘查项目（编号：2014-001）联合资助.

摘　　要：纳岭沟铀矿床是我国近年发现的可地浸砂岩型铀矿床之一，其铀矿体产于中侏罗统直罗组下段辫状河砂体中，受古层间氧化带控制，呈板状。通过对该矿床的矿石和围岩进行岩石地球化学分析表明：矿床的含矿砂岩成分成熟度低，铀矿化与砂岩中的有机质含量关系密切；围岩中 FeO、Al2O3、CaO、Na2O 含量均稍高于矿石，而 Fe2O3、MgO 含量偏低。造成这种差异的原因是与本区的还原性蚀变组合有关。铀矿石中 Se、Mo、V 含量均随着 U含量的增高而增高，呈正相关；Re 含量与 U 含量呈线性相关；Sc 含量随 U 含量变化不明显。直罗组砂岩表现出壳型花岗岩的微量和稀土元素特征，说明阴山古陆富铀花岗岩体是区内直罗组下段沉积的重要物源，同时也是后期铀成矿的重要铀源。Nalinggou uranium deposit is one of the newly discovered in situ leachable sandstone type ura-nium deposits in China.The orebody is of platy shape which is localized in sandbody of braided river in Zhiluo formation of middle Jurassic and controlled by paleo interlayer oxidation zone.The petrogeo-chemical characteristics of uranium ore and surrounding rocks shows that the ore host sandstone is low in composition maturity and it is closely related to organic matter.The hosting rocks is of higher content of FeO,Al2O3 ,CaO,Na2O and lower content of Fe2O3 ,MgO than that of the ore.The reason for this difference is the combination of reducing alteration.The content of Se,Mo,V in uranium ore increased with uranium content and Re content is linearly associated with U content.The relations between Sc con-tent and uranium content are not significant.Characteristics of trace and rare elements in sandstone from Zhiluo formation seems crustal granite （S type granite）,which indicated that uranium rich granite from ancient Yinshan land was an significant material source for lower Zhiluo formation deposition in this area,and was also important uranium source for later uranium mineralization.

关 键 词：纳岭沟铀矿床 铀矿化 岩石地球化学 微量元素 稀土元素 

分 类 号：P595[天文地球—地球化学]