坦桑尼亚马嘿嘎金矿床地质特征和找矿方法研究  

Geological characteristics and prospecting method of Maheiga gold deposit in Tanzania

作　　者：袁杨森[1] 张雷[1] 陈璐璐[1] 杨九鼎[1] 

机构地区：[1]河南省地质矿产勘查开发局第二地质矿产调查院,郑州450001

出　　处：《矿产勘查》2016年第5期844-854,共11页Mineral Exploration

基　　金：2010;2012年度国外矿产资源风险勘查专项资金项目(编号:10216B003;201210B01600252;201210B01600236) 资助

摘　　要：坦桑尼亚马嘿嘎金矿赋存于太古宙绿岩带的条带状含铁建造(BIF)中,矿体形态严格受条带状含铁建造控制,呈层状、似层状产出,业内多有人将该类型金矿床简单归为"层控型"。文章结合一手地质资料和相关测试数据,较为详细地描述了马嘿嘎金矿床地质特征,突出说明了该金矿床是受区域大型剪切带控制,其"层控特征"是受"富铁的选择性交代作用"影响所产生的"表象"。而利用"物探高精度磁法测量"圈定BIF赋存区域,并结合"特征矿物——毒砂"及"As元素异常"的辨识是寻找此类金矿床最有效的找矿方法。The Maheiga gold deposit in Tanzania is located in banded iron formation （BIF） of Archean greenstone belt, the ore bodies occur in forms of layer, layer-like which are strictly controlled by BIF. The deposit type is classified as stratabound type deposit by some reserachers. Based on the practical geological data and assay data, the geological characteristics of Maheiga gold deposit was described in detail, and the gold deposit which is mainly controlled by the regional largscale shear zone, was highlighted. The stratabound characteristics of the deposit is actually an appearance resulted from iron-bearing selective metasomatism. The most effec- tive prospecting method for BIF gold deposit is the high-precision geophysical magnetic survey which delimitate BIF-hosted area and in combination with the identification of typical arsenopyrite mineral and arsenic anomaly.

关 键 词：坦桑尼亚 绿岩带 条带状含铁建造 剪切带 毒砂 

分 类 号：P618.51[天文地球—矿床学]