沽源-红山子地区火山岩型铀矿床蚀变特征

The alteration characteristics of uranium deposits in Guyuan-Hongshanzi area

本章着重对沽源-红山子地区几个典型铀矿床的近矿围岩蚀变特征、蚀变期次及蚀变带地球化学进行了研究,结果表明:红山子铀矿床与矿化关系密切的围岩发育碱性蚀变,主要包括钠长石化、赤铁矿化和绿泥石化;其它铀矿床与矿化关系密切的围岩则发育酸性蚀变,主要包括水云母化、硅化和萤石化。蚀变带的岩石地球化学分析表明,U与Pb、Zn、Mo的含量呈明显正相关,而与Cu的相关程度较低;蚀变带岩石出现Cd、Sn的含量异常。

The article focuses on characteristics and phases of the close ore wallrocks alteration of some typical deposits in the Guyuan-Hongshanzi area.The results indicate that alkai metasomatism is closely related to metallization in Hongshanzi uranium deposit,which includs albitization,hematitization,chloritization,while acidic alteration is closely correlated with metallization in the other uranium deposits,which includs hydromicazation,silication,fluoritization.Chemical analysis of rocks in different depth shows that uranium content bears positive relation to Pb,Zn,Mo,and negative relation to Cu.Besides,there are Cd and Sn anomalies in the rocks of alteration zone.