玉华山盆地濂坑地区成矿地质特征及远景分析

Geological characteristics and prospective analysis of uranium mineralization in Liankeng area,Yuhuashan Basin

如何扩大和发展老的铀矿点(带)是当前铀矿找矿紧迫的任务之一,本文对濂坑矿点地质背景、地质特征、控矿因素进行系统分析,结果表明区内铀矿体空间定位受石口—筒山断裂上盘一组走向近SN的次级断裂控制;矿化受构造、岩性组间界面共同控制,赋矿围岩为碎斑熔岩。该区在300m以浅的第一找矿空间取得了较好的成果,矿体多受单工程控制,仍有较大的找矿空间;其深部“推覆体”下隐伏有次火山岩体,与相山矿田北部与“推覆体”有关的矿床成矿地质条件相似,因此本文建议将濂坑矿点深部的推覆构造和次火山岩体作为下一步找矿的重点对象,这对扩大濂坑矿点铀资源量具有重要实践意义。

Increasing the uranium resources of previous found uranium mineral occurrences/belt is one of the urgent tasks of uranium prospecting.Through systematic analyses of the geological background,geological characteristics and orecontrolling factors of the Liankeng uranium occurrence,we found that the uranium ore bodies were controlled by S-N secondary fractures on the hanging wall of the Shikou-Tongshan fault;Uraium mineralization was joint controlled structure and the interface between different formations.In addition,the surrounding rock of this mineral occurrence is porphyroclastic lava.Good Ore-prospecting achievements were obtained in the first uranium prospecting space(0-300m).owing to the fact that the uranium ore body was controlled by single drilling hole,it indicates that there was good prospecting potential in this area.There is a subvolcanic pluton concealed under the deep"nappe",which is similar to the ore-forming geological setting of the deposit located in the northern part of the Xiangshan mine field.Therefore,we suggest that the deep nappe and subvolcanic rock mass of the Liankeng mine should be the key targets for future prospecting,which is of great significance to increase the uranium resources at the Liankeng.