攀枝花大田铀矿床基本特征及成因  

Basic characteristics and genesis of the Datian uranium deposit in Panzhihua area, Western Sichuan

作　　者：孙泽轩 陈友良[2] 姚建 韩文文 王凤岗[3] 张亮 SUN Zexuan;CHEN Youliang;YAO Jian;HAN Wenwen;WANG Fenggang;ZHANG Liang(Research Institute No.280,China National Nuclear Corporation,Guanghan,Sichuan,618300;Chengdu University of Technology,Chengdu,Sichuan,610059;Beijing Research Institute of Uranium Geology,China National Nuclear Corporation,Beijing,100029)

机构地区：[1]核工业280研究所,四川广汉618300 [2]成都理工大学,成都610059 [3]核工业北京地质研究院,北京100029

出　　处：《地质论评》2020年第4期1005-1018,共14页Geological Review

基　　金：国家自然科学基金资助项目“攀西地区混合岩型铀矿成矿机理研究”(编号:41472073);中国核工业地质局项目“四川攀枝花大田地区铀矿普查”(编号:201638-1、201807-1)的成果。

摘　　要：大田铀矿床为康滇古陆上探明的首例铀矿床。在矿床勘探过程中,共施工钻探29712 m、槽探5000m^3,发现工业铀矿孔25个、铀矿化孔6个。本文在野外调查、岩芯编录和勘探剖面编制的基础上,结合样品分析测试,对大田铀矿床基本特征及成因进行了研究。结果表明,大田铀矿床是在Rodinia大陆裂解拉张背景下,构造热液作用过程中形成的。已探明铀矿(化)体定位于构造蚀变带内,矿体形态呈透镜状、脉状。原生铀矿物以晶质铀矿为主,含少量钛铀矿、沥青铀矿。赋矿岩石为斜长角闪岩,其原岩为侵位于构造蚀变带内的辉长岩脉。主量元素特征显示,赋矿岩石与基性岩类辉长岩主量元素含量特征一致;稀土元素特征显示,赋矿岩石的原岩形成于拉张构造环境。铀成矿与钠交代作用关系密切。Objectives:The Datian uranium deposit is the first one prospected in Xikang—Yunnan oldland. This paper studied the basic characteristics and the genesis of Datian uranium deposit in Panzhihua area.Methods:In the process of deposit prospection,29712 m of drilling and 5000 m^3 of trenching projects were accomplished. We applied field investigation,core catalogue,profile making,samples analysis and testing research methods.Results:The uranium orebody and the uranium mineralized body are located in the tectonic alteration belts,and the shape of ore body is lenticular and vein. The primary uranium mineral is mainly uraninite,containing a small amount of brannerite and pitchblende. The ore bearing rock is amphibolites,and it’s original rock is gabbro vein intruded in the tectonic alteration belt. The characteristics of the major elements show that the content of the major elements of the ore bearing rocks is consistent with that of the gabbros of the basic rocks, and the characteristics of the rare earth elements show that the original rocks of the ore bearing rocks are formed in the tensile tectonic environment. Uranium mineralization is closely related to sodium metasomatism.Conclusions:The Datian uranium deposit was formed in the process of tectonic—hydrothermal,and under the background of Rodinia continental splitting and extension.

关 键 词：构造蚀变带 斜长角闪岩脉 钠交代作用 晶质铀矿 大田铀矿床 攀枝花地区 

分 类 号：P619.14[天文地球—矿床学]