若尔盖地区510-1铀矿床矿物组合垂直分带特征及找矿意义  

Vertical zoning features of the mineral assemblages in the Zoige 510-1 uranium deposit and its prospecting significance

作　　者：叶永钦[1] 陈友良[2] 赵聪[2,3] 

机构地区：[1]核工业二九〇研究所,广东韶关512029 [2]成都理工大学,四川成都610059 [3]四川省核工业地质调查院,四川成都610061

出　　处：《矿物学报》2015年第2期239-244,共6页Acta Mineralogica Sinica

基　　金：国家自然科学基金项目(批准号:41072064)

摘　　要：510-1铀矿床是若尔盖地区极具代表性意义的典型铀矿床之一。本文通过详细的野外地质观察和室内光、薄片矿物成分鉴定总结,将510-1碳硅泥岩型铀矿床自上而下依次划分为"酸帽"带、"酸碱共生"带和"碱性基底"。"酸帽"带(1中段及以上矿段),主要发育石英脉;"酸碱共生"带(2-4中段),石英脉与方解石脉均较发育,尚发育原生硫化物,如黄铁矿、黄铜矿、闪锌矿等;"碱性基底"(5-7中段及以下),大量发育方解石脉,很少见石英脉,且原生硫化物发育。矿床第5中段为"酸碱分离"的过渡地带(距地表矿化露头约320m),也是下部矿带与中部矿带的分界部位。上述矿床的分带特征,对若尔盖铀矿田其它矿床的勘查工作具有参考指导意义。The 510-1 uranium ore deposit is significant in representing as typical regional ore deposit in Zoige County. Through detailed geologic observation in the field and identification of mineral compositions on polished sections and thin sections in the lab, the 510-1 carbonaceous-siliceous-argillitic rock-type uranium deposit can be divided into an upper, a middle and a lower ore zone. Quartz veins formed towards the top of the ore deposit(level No.1 and above). Both quartz veins and calcite veins are to be found in the middle zone(level No.2 to No.4),include primary sulphide minerals(pyrite, chalcopyrite, sphalerite, etc.). Whereas, in the lower ore zone(level No.5 to No.7 and below), only calcite veins and primary sulphide minerals are present but no quartz veins are found. The research indicates that there exists an 'acid and alkali isolation' geochemical interface near level No.5 of the 510-1 uranium deposit(320 m or so below the current surface mineralized outcrop). Zoning characteristics of these mineral assemblages provide an important reference for further exploration of Zoige uranium ore field and other deposits.

关 键 词：若尔盖 碳硅泥岩型铀矿 矿物组合 垂直分带 

分 类 号：P619.14[天文地球—矿床学]