鹿井铀矿田成矿地质特征及控矿因素

Analysis on the metallogenic feature and ore-controlling factors in Lujing uranium orefield

鹿井铀矿田位于诸广山复式岩体中段,区内出露印支-燕山期粗粒黑云母花岗岩、二云母花岗岩以及寒武纪浅变质岩系,成矿围岩主要有花岗岩和浅变质岩系。铀矿床类型为花岗岩型和花岗岩外带型,成矿年龄47~116.4Ma,矿体多呈脉状、树枝状、透镜状。断裂、裂隙控制了铀矿体的定位,晚期小岩体穿插对铀矿化的形成具有重要的意义,不同期次岩体接触界面控制了铀矿体的聚集。

Lujing uranium orefield is located in the middle of Zhuguangshan composite pluton,the exposed rocks in the field are Indosinian-Yanshanian coarse grain biotite granite,two-mica granite and lightly metamorphosed Cambrian rocks.The host rock for uranium mineralization are mainly granites and lightly metamorphic rock series.There are two main types of deposits,granite-type and granite periphery type,and the mineralization age is 47—116.4Ma.The ore bodies are veiny,dendritics,lenticular.Faults and fractures control the ore body positioning,and the contact interface of the granites of different period control the aggregation of uranium ore body.Later little supplementary pluton is significant for the formation of the uranium mineralization.