相山矿田北部铀成矿地质特征和控矿因素分析

Analysis on geological features and ore controlling factors of uranium mineralization in northern Xiangshan ore field

基于对相山矿田北部大量钻孔剖面数据的二次开发、整合,利用钻孔轨迹投影,绘制了五条贯穿相山整个北部地区的NS向钻孔数据提取剖面图,直观清晰地展示出该区地质和铀矿体的分布特征。区内断裂构造发育,打鼓顶组下段较厚,且次火山岩体侵位形式多样。综合认为,相山矿田北部铀成矿主要受断裂构造、次火山岩和岩性界面控制。由南向北看,矿体的分布由组间界面控制逐渐转换为断裂构造、次火山岩体以及次火山岩体和基底变质岩接触带控制,尤其是各种控矿因素叠加及形态变异部位是极为有利的成矿空间。以绘制的钻孔数据提取剖面为依据,认为打鼓顶组下段中侵位的次火山岩、基底界面以及基底变质岩深部隐伏的次火山岩体具有较好的成矿潜力。

Five N-S-trending borehole extraction profiles through the whole northern area of Xiangshan ore field were drawn by using the borehole trajectory projections,which directly and clearly show the geological features and spatial distribution characteristics of uranium ore bodies.In this area,the fault structure is well-developed,the lower part of Daguding Formation is thick,and the intrusive forms of sub-volcanic rock are various.Through the comprehensive analysis and summary of the ore controlling factors in this area,it was considered that uranium mineralization was mainly controlled by fault structure,sub-volcanic rock and lithological interface in the north of Xiangshan.From the south to the north,the distribution of ore bodies was gradually controlled by intergroup interface to fault structure,sub-volcanic rock and the contact zone between subvolcanic rock and basement metamorphic rock,especially the composite of ore controlling factors and the position of morphological variation,are extremely favorable metallogenic space.Based on the borehole extraction profiles,it was considered that the sub-volcanic rock emplaced in the lower part of Daguding Formation,the basement interface and the sub-volcanic rock concealed in the basement metamorphic rock have good metallogenic potential.