坦桑尼亚东马拉金矿矿床地质特征及找矿方向

The Geological Features and Prospecting Potential for East Mara gold mine deposit of Tanzania

坦桑尼亚东马拉金矿位于马拉-穆索马绿岩带上的马拉绿岩带,是近期在马拉绿岩带上发现的又一中型金矿床。赋金地质体为太古代尼安兹系的片麻岩、片岩,蚀变类型有硅化、黄(磁黄)铁矿化、碳酸盐化及粘土化,偶见方铅矿化;矿体呈脉状和透镜状,金矿物主要为自然金;矿床类型为中温热液脉型金矿床;矿区主要为石英脉型金矿。加强金矿体产出特征研究,寻找有利含金构造部位,有望扩大找矿远景。

The East Mara gold mine in Tanzania is located on the Mara Greenstone Belt of Mara-Musoma Greenstone Belt. It is a middle-scale gold mine deposit explored on Mara Greenstone Belt in recent years. The gold-bearing geological body is gneiss, schist of Archeozoic-Nyanzian. The alteration types are quartzitification, pyritization, carbonatization, clayzation and few galena mineralization. The ore body appears veined and lenticular, the main gold bearing minerals are native gold, the deposit type is mesothermal hydrothermal vein deposit;quartz-vein type gold deposit is the main one in the mining site. Strengthening the research on the output characteristics of gold ore bodies and finding favorable gold-bearing structural parts are expected to expand the prospecting prospects.