鄂尔多斯盆地塔然高勒铀矿床铀矿物赋存状态及地球化学特征  

Occurrence state and geochemical characteristics of uranium minerals ofTarangaole uranium deposit in the Ordos Basin

作　　者：张安 王运 胡宝群[1] 吴金钟 李怡霏 朱满怀 Zhang An;Wang Yun;Hu Baoqun;Wu Jinzhong;Li Yifei;Zhu Manhuai(School of Earth Sciences,East China University of Technology,Nanchang,Jiangxi 330013;Geological Party No.208,CNNC,Baotou,Inner Mongolia 014010)

机构地区：[1]东华理工大学地球科学学院,江西南昌330013 [2]核工业二〇八大队,内蒙古包头014010

出　　处：《资源环境与工程》2024年第3期239-248,共10页Resources Environment & Engineering

基　　金：中核集团集中研发项目(LCEQ01-9);江西省重点研发计划项目(20203BBG72W011);东华理工大学博士启动基金项目(DHBK2019051)。

摘　　要：塔然高勒铀矿床是鄂尔多斯盆地北部新发现的大型地浸砂岩型铀矿床。为研究该矿床铀的赋存状态及地球化学特征,并对地浸采铀条件进行初步评价,选取典型样品开展电子探针分析、常量和微量(稀土)元素地球化学分析等工作。研究结果表明,该矿床铀矿物主要为铀石,呈颗粒状、脉状、板状和胶状等赋存于伴生矿物边缘,其中少量铀石伴生硒铁矿、包裹硒铅矿,具生长环带。铀矿石与围岩相比,U、Y、Mo、V、LREE、HREE、ΣREE含量明显增多,而Nb、Ba、Ta、Sr含量明显减少;同时元素相关性分析发现,U含量与Y、V、LREE、HREE、ΣREE含量呈极显著正相关,说明铀成矿与围岩关系不大,主要与成矿流体有关。通过对本区铀成矿条件的分析,认为本区周边及深部找矿潜力巨大。另外由于该矿床铀矿物主要为易溶解的铀石且碳酸盐矿物含量少,易于地浸开采。The Tarangaole uranium deposit is a newly discovered large-scale in-situ leaching sandstone-type uranium deposit in the northern Ordos Basin.In order to study the occurrence state and geochemical characteristics of uranium in the deposit,preliminarily evaluate the conditions of in-situ leaching uranium mining.Typical samples were selected to carry out electron probe analysis,geochemical analysis of major and trace(rare earth)elements.The results show that the uranium minerals in the deposit are mainly coffinite,which are granular,veined,tabular and colloidal in the edge of associated minerals.Among them,a small amount of uranium ore is associated with selenium iron ore,wrapped selenium lead ore,and has a growth ring.Compared with the surrounding rocks,the contents of U,Y,Mo,V,LREE,HREE andΣREE have increased significantly,while the contents of Nb,Ba,Ta and Sr have decreased significantly.At the same time,the correlation analysis of elements show that the content of U was significantly positively correlated with the contents of Y,V,LREE,HREE andΣREE,indicating that the uranium mineralization was not related to the surrounding rock,but mainly related to the ore-forming fluid.By analyzing the conditions of uranium mineralisation in this area,it is believed that there is a huge potential for ore searching in the periphery and in the deep part of the area.In addition,because the uranium minerals in the deposit are mainly soluble uranium and the content of carbonate minerals is small,it is easy to be mined by in-situ leaching.

关 键 词：铀 赋存状态 地球化学特征 砂岩型铀矿 鄂尔多斯盆地 

分 类 号：P619.14[天文地球—矿床学]