若尔盖地区510-1铀矿床脉石矿物微量元素垂向分带特征  

Vertical Zoning Characteristics of Trace Element in Gangue Mineral of Uranium Deposit 510-1 in Zoige

作　　者：叶永钦[1,2] 陈友良[2] 倪师军[2] 

机构地区：[1]核工业290研究所,广东韶关512029 [2]成都理工大学,四川成都610059

出　　处：《铀矿地质》2015年第5期510-516,共7页Uranium Geology

基　　金：国家自然科学基金项目"若尔盖地区碳硅泥岩型铀矿床垂直分带规律研究"(编号:41072064)资助

摘　　要：510-1铀矿床是若尔盖地区极具代表性的碳硅泥岩型铀矿床之一,笔者从其热液作用产物(铀矿石及脉石矿物)入手,分不同中段详细研究了该矿床的脉石矿物微量元素垂向分带特征。结果表明:成矿期方解石脉的U、Sb平均含量在5中段有一明显的低谷值;各种稀土元素及∑REE平均含量在第5中段附近有一明显的拐点;δCe与δEu值在第5中段附近也有显著变化。这反映出第5中段存在一个地球化学界面,使成矿流体的氧化还原环境发生了突变。Uranium deposit 510-1is one of the typical carbonaceous-siliceous-arillaceoius rock type deposit in Zoige.By studying the vertical zoning characteristics of trace element in gangue mineral from different levels,the authers found that average content of U,Sb in calcite veins of metallogenic period shew a obvious lower value nearby level 5,and the average content of∑REE in calcite veins shew a obvious change nearby level 5.The significant changes ofδCe andδEu in calcite veins also occurred nearby the level 5.These two feature nearby level 5of uranium deposit 510-1indicates that there was a geochemical interface which cause the abrupt change for the oxidative-reductive condition of metallogenic fluid.

关 键 词：若尔盖地区 碳硅泥岩型铀矿 脉石矿物 微量元素 垂向分带 

分 类 号：P612[天文地球—矿床学]