江西省兴国县大乌山地区铀成矿规律与成矿预测

Metallogenic Regularities and Metallogenic Prognosis of Uranium in Dawushan,Xingguo County,Jiangxi Province

大乌山地区位于桃山-诸广铀成矿带的北段,东邻古龙岗铀矿化集中区,南与兴国铀矿化集中区以兴国红盆相隔。为进一步分析总结区内铀成矿规律,并对区内铀成矿远景进行整体评价,文章在资料综合整理和综合研究的基础上,结合野外地质调查成果,认为:区内铀矿化虽然含矿围岩差别较大,但热液型成矿特征均非常明显,控矿的主要因素相同或相近,为相对统一的区域岩浆-构造-热液活动所制约;区内铀矿化主要赋存于不同期次花岗岩、花岗岩与变质岩的接触部位,不同方向断裂交汇或夹持部位、同时与中基性脉岩、热液蚀变等密切相关,可作为区域上的铀成矿预测要素和找矿标志。通过研究区内铀成矿地质背景、铀成矿地质特征,总结了区域铀成矿模式、铀成矿规律与找矿标志,结合野外地质调查和物、化探测量成果,圈定了1片铀成矿远景区。

Dawushan area is located in the northern of Taoshan-Zhuguang uranium mineralization belt,east neighbor to Gulonggang Uranium mineralization concentration area,Separated from the Xingguo red basin in the south.In order to further analyze and summarize the uranium metallogenic regularity in the area,and carry on the overall evaluation of uranium metallogenic prospect in the area.Based on data collation and comprehensive study,combined with field geological survey results.It is concluded that although the host rocks of uranium mineralization are different,the characteristics of hydrothermal mineralization are very obvious.It’s restricted by the regional magma-tectonic-hydrothermal activity,and the main ore controlling factors are the same or similar.Uranium mineralization in the area mainly occurs in the granites of different ages,the contact site of granite and metamorphic rock,and the intersection or clamping parts of faults in different directions.It is closely related to intermediate basic dikes and hydrothermal alteration,and it can be used as a regional uranium metallogenic prediction factor and prospecting criteria.Based on the research of uranium metallogenic geological background and geological characteristics in the area,the uranium metallogenic model,uranium metallogenic regularity and prospecting criteria in the area are summarized.Combined with the results of field geological survey,physical and geochemical survey,a uranium metallogenic prospective area was delineated.