辉南抚民含金蚀变带地质特征及其找矿前景

蚀变带位于晚元古代青白口系钓鱼台组石英砂岩下部与晚太古代变二长花岗岩接触部位,与下伏变二长花岗岩呈断层接触关系,与石英砂岩呈渐变过渡接触关系。蚀变带呈断续出现,宽10～20 m,长200～800 m,走向北东50°～60°。蚀变矿物主要为硅化石英,少量重晶石化、绢云母化、黄铁矿化,拣块分析品位Au：0.33×10-6。其赋存层位、蚀变矿物组合与区域上大型金矿床金英金矿相似,通过二者对比分析认为,本区具备金英式金矿形成的地质条件,找矿前景较好。

The geological features and exploration prospects of Huinan Fumin auriferous alteration zone

The alteration zone is located in contact position between the lower part of the late Proterozoic Qb Diaoyutai Formation quartz sandstone and the late Archean metamorphic monzonitic granite,showing the fault contact relationship with the underlying metamorphic monzonitic granite,the gradational contact relationship with the quartz sandstone.The alteration zone appear intermittently,10~20 m wide,200~800 m long strike NE 50°~60°.The alteration mineral is mainly silicified quartz,a little baritization,sericitize,pyritization,chip analysis grade Au:0.3x10-6.Its bearing strata,alteration mineral combination are similar to the large gold deposit,Jinying gold mine;by the comparative analysis,it is considered that the study area has the geological conditions of Jinying type gold mine,and better exploration prospects.