马达加斯加金矿床成因及找矿标志研究  

Research on Genesis and Prospecting Indicators of Gold Deposits in Madagascar

作　　者：杨喜安[1] 刘善宝[1] 赵宪东 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]山东正元地质勘查院,山东烟台264002

出　　处：《黄金科学技术》2014年第2期1-6,共6页Gold Science and Technology

基　　金：中国博士后科学基金项目"马达加斯加Maevatanana金矿床成因研究"(编号:2013M541000);中国地质调查局地质大调查项目"全球巨型成矿带找矿勘查方法技术研究"(编号:12120113102100)联合资助

摘　　要：马达加斯加金矿床类型为石英脉型,金矿化包括含金石英脉及其两侧的矿化围岩,金矿体产在NNW向剪切带和EW向断层交会处。金成矿作用主要与泛非造山运动有关。在泛非造山期,马达加斯加发生了强烈的构造岩浆活动,地壳深部含金硅铝质岩发生部分熔融形成花岗质岩浆。花岗质岩浆从岩石中萃取成矿组分,形成含矿热液流体。沿断裂上升的热液流体与地下含矿热水混合,构成岩浆水与大气降水的混合成矿流体,这些成矿流体进入构造有利空间,充填和交代围岩,形成含金石英脉。The gold deposit in the Madagascar is a classical quartz vein type gold deposit,the gold mineralization developed in the quartz vein and its wall rock.The gold deposit is intersected by major NNW trending shear zones and east-trending fracture sets,gold mineralization is associated with Pan-African orogeny.In the Pan-African orogeny,there are intensive tectonic-magmatic in Madagascar,results partial melting of the lower crust,a large amount of fluids and granitic magma are formed.In the process of the ascent of the fluids,mixed shallow-sourced meteoric fluid,the ore-forming fluids would have entered the favourable faults,resulting in mineralization.

关 键 词：金矿床 泛非造山运动 含金石英脉 太古宙 条带状铁建造 绿岩带 马达加斯加 

分 类 号：P618.51[天文地球—矿床学]